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general description the max886/max888/max1863 power-management ics are complete power systems for wireless and satellite handsets. the devices operate from 3- to 6-cell nicd/nimh batteries or from 1- or 2-cell lithium-ion (li+) batteries. they incorporate a high-efficiency, step-down dc-dc converter, a regulated 5v charge pump, and four linear regulators. the regulators supply power to the sim, lcd, bb, dsp, and rf sections of a cellular tele- phone handset. the step-down converter and linear reg- ulator outputs are adjustable by internal 4-bit dacs, programmable through the i 2 c-compatible serial inter- face. a pushbutton on/off scheme activates a 5? low- power shutdown mode. the devices also feature a low-battery detector output and an internal startup timer. the max886/max888/max1863 differ in output voltage range and power-on reset voltage. the max886 has a higher preset voltage range and is intended for 2-cell li+ or 5- or 6-cell nicd/nimh batteries. the max888/ max1863 have a lower preset voltage range and are intended for 1-cell li+ or 3- or 4-cell nicd/nimh batter- ies. all devices are available in a space-saving, 32-pin tqfp package. applications satellite phones private mobile radio (pmr) wireless handsets gsm cellular/pcs telephones features 90% efficient, 500ma step-down converter two 100ma dac-controlled ldos one 200ma dac-controlled ldo one 20ma dac-controlled ldo 3- to 6-cell nicd or nimh operation 1- or 2-cell li+ operation +2.7v to +12v input voltage range 250a standby (pfm) quiescent current 5a shutdown current i 2 c-compatible serial interface selectable 375khz, 535khz, 670khz, 925khz (or synchronizable) switching frequency power-on reset and startup timer thermal overload protection pushbutton on/off control space-saving 32-pin tqfp package (9mm x 9mm) max886/max888/max1863 wireless and satellite handset power-management ics ________________________________________________________________ maxim integrated products 1 batt lbo scl sda lbi in 2.7v to 12v i 2 c-compatible serial interface low-battery detect on/off control (optional) lx main power (up to 500ma) pgnd out0 tx section power (up to 100ma) dsp power (up to 200ma) 3v/5v sim card power (up to 20ma) lcd/vco/txco power (up to 100ma) power-on reset rx section power (up to 100ma) out1 max886 max888 max1863 out2 reset out3 out4 out5 onstat gnd off sync c+ c- on on status 19-1438; rev 2; 3/01 part max886ecj max888ecj -40? to +85? -40? to +85? temp. range pin-package 32 tqfp 32 tqfp typical operating circuit ordering information pin configuration appears at end of data sheet. i 2 c is a trademark of philips corp. for pricing, delivery, and ordering information, please contact maxim/dallas direct! at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. MAX1863ECJ -40? to +85? 32 tqfp evaluation kit available
max886/max888/max1863 wireless and satellite handset power-management ics 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics (v batt = v in0 = v in1 = +5.5v, gnd = pgnd = dgnd, v off = v sync = 2.8v, v in2 = v in3 = v in4 = v in5 = +3.8v, v out4 = +5.5v, t a = -40? to +85?, unless otherwise noted. typical values are at t a = +25?.) (note 1) stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress rating s only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specificatio ns is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. batt, in0, in1 to gnd...........................................-0.3v to +13v cvh to in0................................................................-6v to +0.3v pgnd, dgnd to gnd...........................................-0.3v to +0.3v onstat to gnd .....................................-0.3v to (v out2 + 0.3v) lx to pgnd................................................-0.3v to (v in0 + 0.3v) out1 to gnd.............................................-0.3v to (v in1 + 0.3v) out2 to gnd.............................................-0.3v to (v in2 + 0.3v) out3 to gnd.............................................-0.3v to (v in3 + 0.3v) out5 to gnd.............................................-0.3v to (v in5 + 0.3v) sync, reset , scl, sda, cvl, lbi, lbhys, out0 ref, lbo , c+, c-, out4, in2, in3, in4, in5, on , off to gnd ..................................................-0.3v to +6v continuous power dissipation (t a = +70?) 32-pin tqfp (derate 11.1mw/? above +70?)..........889mw operating temperature range. ..........................-40? to +85? junction temperature ......................................................+150? storage temperature range .............................-65? to +150? lead temperature (soldering, 10s) .................................+300? v out0 = 3.75v (max886), v out0 = 2.027v (max888), v out0 = 1.827v (max1863) max888, max1863 max886 i out0 = 0 2.7v < v out0 < 3.75v f osc = 375khz 1? < i ref < 100? i ref = 0 sync = gnd v batt falling v batt rising conditions % of v out0 output ready threshold -7.5 -5 -3 v 1.527 3.027 v out0 nominal output adjustment range 2.625 3.750 % -3 3 output accuracy v 2.7 12 v in0 input voltage range mv 0.2 5 reference supply rejection mv 515 reference load regulation v 1.225 1.275 v ref reference output voltage 1.23 1.25 1.27 v 2.7 5.5 v in2 , v in3 , v in4 , v in5 in2, in3, in4, in5 operating voltage range v 2.7 12 v batt , v in0 , v in1 batt, in0, in1 operating voltage range 510 2 ? 250 600 i battpfm supply current, pfm mode v 2.35 2.45 v uvlof v 2.55 2.65 v uvlor undervoltage lockout units min typ max symbol parameter off = gnd ? 15 i stnby supply current, shutdown mode t a = 0? to +85? t a = -40? to +85? t a = 0? to +85? t a = -40? to +85? f osc = 535khz 3 f osc = 670khz f osc = 925khz ma 5.5 12 i battpwm supply current, pwm mode 4 reference dc-dc buck regulator 0 (in0, out0)
max886/max888/max1863 wireless and satellite handset power-management ics _______________________________________________________________________________________ 3 electrical characteristics (continued) (v batt = v in0 = v in1 = +5.5v, gnd = pgnd = dgnd, v off = v sync = 2.8v, v in2 = v in3 = v in4 = v in5 = +3.8v, v out4 = +5.5v, t a = -40? to +85?, unless otherwise noted. typical values are at t a = +25?.) (note 1) i out1 = 0.1ma to 100ma table 4 i out0 (max886, max888) v in0 = 3.8v conditions % -3 3 output accuracy v 2.7 12 v in1 input voltage range % -23 23 f osc oscillator frequency accuracy -20 20 a 0.6 0.9 1.2 i limit internal switch current limit ma 63 98 180 pfm to pwm threshold ? 0.4 1 r on internal switch on-resistance units min typ max symbol parameter v out2 = 3.3v (max886), v out2 = 1.527v (max888, max1863) max888, max1863 max886 i out2 = 0.1ma to 200ma 3v < v in1 < 12v, 0h code i out1 = 0.1ma to 100ma i out1 = 100ma i out1 = 1ma max888, max1863 max886 v 1.527 3.027 v out2 nominal output adjustment range 2.175 3.30 % -3 3 output accuracy v 2.7 5.5 v in2 input voltage range ma 100 250 current limit %/v -0.1 0 0.1 line regulation %/ma -0.01 0.01 output load regulation mv 90 200 dropout voltage 1 v 1.25 3.5 v out1 nominal output adjustment range 2.70 4.95 2.7v < v in2 < 3.8v, 0h code i out2 = 0.1ma to 200ma i out2 = 200ma i out2 = 1ma ma 200 500 current limit %/v -0.3 0.3 line regulation %/ma -0.005 0.002 output load regulation 90 200 dropout voltage mv 1 % of v out2 -7.5 -5 -3 v rdy2 output ready threshold i out3 = 0.1ma to 20ma % -3 3 output accuracy v 2.7 5.5 v in3 input voltage range khz 0.8 ? f osc 1.2 ? f osc f osc sync range t a = 0? to +85? t a = -40? to +85? v lx = 12v ? 0.1 10 lx leakage current v lx = 12v % 100 maximum duty cycle 3v < v in0 < 12v % -0.3 0 0.3 line regulation i out0 = 0.1ma to 500ma % -1.5 output load regulation ldo regulator 3 (in3, out3) i out0 (max1863 only) 130 235 340 oscillator frequency (out0, out4) ldo regulator 1 (in1, out1) ldo regulator 2 (in2, out2)
max886/max888/max1863 wireless and satellite handset power-management ics 4 _______________________________________________________________________________________ electrical characteristics (continued) (v batt = v in0 = v in1 = +5.5v, gnd = pgnd = dgnd, v off = v sync = 2.8v, v in2 = v in3 = v in4 = v in5 = +3.8v, v out4 = +5.5v, t a = -40? to +85?, unless otherwise noted. typical values are at t a = +25?.) (note 1) i out5 = 1ma max886 i out5 = 0.1ma to 100ma no load v out3 = 2.85v or 4.65v only 3.8v < v in3 < 5.5v, v out3 = 2.85v conditions 1 v 2.175 3.300 v out5 nominal output adjustment range % -3 3 output accuracy v 2.7 5.5 v in5 input voltage range v 5.10 5.25 5.41 v out4 output voltage khz f osc / 2 switching frequency ma 20 50 current limit %/v -0.3 0.3 line regulation units min typ max symbol parameter v lbi = step from 1.23v to 1.27v v lbi = 1.23v 2.7v < v in5 < 3.8v, 0h code i out5 = 0.1ma to 100ma i out5 = 100ma ? 10 lbi propagation delay ? -0.2 0.2 lbi input current ma 100 250 current limit %/v -0.3 0.3 line regulation %/ma -0.01 0.01 output load regulation mv 72 200 dropout voltage 0.4 v il ms 28 37 47 startup timeout period ms 56 75 94 reset timeout period v 1.2 v ih on input voltage v lbo = i lbhys = 1ma, v lbi = v ref - 15mv v 0.5 lbo /lbhys output low voltage v lbo = v lbhys = 12v, v lbi = v ref + 15mv ? -0.2 0.2 lbo /lbhys leakage current v v ref - v ref v ref + 15mv 15mv lbi threshold max888, max1863 1.25 3.50 5.21 i out4 = 50ma i out3 = 0.1ma to 20ma %/ma -0.035 0.02 output load regulation i out3 = 20ma 20 50 i out3 = 1ma mv 1 dropout voltage v out2 4.65 2.85 v in3 = 5.5v, table 5 v 0 v out3 nominal output voltage charge-pump regulator 4 (in4, out4) ldo regulator 5 (in5, out5) low-battery comparator reset and startup timer logic and control inputs
max886/max888/max1863 wireless and satellite handset power-management ics _______________________________________________________________________________________ 5 note 1: specifications to -40? are guaranteed by design, not production tested. electrical characteristics (continued) (v batt = v in0 = v in1 = +5.5v, gnd = pgnd = dgnd, v off = v sync = 2.8v, v in2 = v in3 = v in4 = v in5 = +3.8v, v out4 = +5.5v, t a = -40? to +85?, unless otherwise noted. typical values are at t a = +25?.) (note 1) i reset = 0, internal 10k ? pullup resistor to out2 i reset = 1ma 1.2v < v on < v out2 conditions ? 0.6 t high scl high period ? 1.3 t low scl low period khz 400 f scl scl clock frequency ? 160 threshold temperature v v out2 - 0.5 v reset h output high voltage v 0.5 v reset l output low voltage ? on input current -16 -40 i il units min typ max symbol parameter i sda = 3ma 0.4 0.6 v il ? 0 0.9 t dhold data hold time ns 100 t dsu data setup time i sda = 6ma v 0.6 sda output low voltage v 1.4 v ih off , sda, scl input voltage v lbo = v lbhyst = 12v, v lbi = v ref + 15mv ? -0.2 0.2 lbo , lbhys leakage current 0 < v ilh < v out2 1 i ilh ? off , sda, scl input current i onstat = 0 onstat output voltage v v out2 - 0.5 v onstath v sync input voltage 0.8 v il -5 -10 i ih 2.0 v ih 0 < v sync < v out2 ? sync input current 0.25 1 i sync i onstat = 1ma v onstat output voltage 0.5 v onstatl v on = 0 onstat output reset output thermal shutdown i 2 c-compatible serial interface
max886/max888/max1863 wireless and satellite handset power-management ics 6 _______________________________________________________________________________________ typical operating characteristics (circuit of figure 2, reg0 to reg5 outputs at por states, v out0 = 3.75v, v out4 = 5.25v, v out1 = v out2 = v out3 = v out5 = 3.3v, t a = +25?, unless otherwise noted.) 1 10 100 1000 max886 reg0 efficiency vs. load current (v batt = 8.4v) max886/88-01 load current (ma) efficiency (%) 100 50 70 60 80 90 pfm, 375khz pfm, 925khz pwm, 375khz pwm, 925khz 1 10 100 1000 max886 reg0 efficiency vs. load current (v batt = 5.4v) max886/88-02 load current (ma) efficiency (%) 100 50 70 60 80 90 pfm, 375khz pfm, 925khz pwm, 375khz pwm, 925khz 0 2 1 4 3 6 5 7 9 8 10 2 456 3 789 11 10 12 max886 no-load battery current vs. battery voltage max886/88-03 battery voltage (v) battery current (ma) pwm, 375khz pwm, 925khz pfm mode 1 10 100 1000 max888 reg0 efficiency vs. load current (v batt = 4.2v) max886/88-04 load current (ma) efficiency (%) 100 50 70 60 80 90 pfm, 375khz pfm, 925khz pwm, 375khz pwm, 925khz 1 10 100 1000 max1863 reg0 efficiency vs. load current (v batt = 2.7v) max886/88-07a load current (ma) efficiency (%) 100 30 50 60 70 80 90 40 pfm 925khz pfm 925khz 1 10 100 1000 max1863 reg0 efficiency vs. load current (v batt = 3.6v) max886/88-07b load current (ma) efficiency (%) 100 30 50 60 70 80 90 40 pfm 925khz pwm 925khz 1 10 100 1000 max1863 reg0 efficiency vs. load current (v batt = 4.2v) max886/88-07c load current (ma) efficiency (%) 100 30 50 60 70 80 90 40 pfm 925khz pwm 925khz 1 10 100 1000 max888 reg0 efficiency vs. load current (v batt = 2.7v) max886/88-05 load current (ma) efficiency (%) 100 50 70 60 80 90 pfm, 375khz pfm, 925khz pwm, 375khz pwm, 925khz 0 2 1 4 3 6 5 7 24 356 max888 no-load battery current vs. battery voltage max886/88-06 battery voltage (v) battery current (ma) pwm, 375khz pwm, 925khz pfm mode
max886/max888/max1863 wireless and satellite handset power-management ics _______________________________________________________________________________________ 7 70 0 0.01 0.1 1 10 100 1000 reg1 power-supply rejection ratio vs. frequency 10 max886/88-10 frequency (khz) psrr (db) 30 20 40 60 50 v out1 = 3.3v i out1 = 10ma c out1 = 2.2 f 70 0 0.01 0.1 1 10 100 1000 reg2 power-supply rejection ratio vs. frequency 10 max886/88-11 frequency (khz) psrr (db) 30 20 40 60 50 v out2 = 3.3v i out2 = 20ma c out2 = 2.2 f 400 s/div reg0 turn-on delay max886/88-12 i out0 = 20ma v on 2v/div v out0 2v/div typical operating characteristics (continued) (circuit of figure 2, reg0 to reg5 outputs at por states, v out0 = 3.75v, v out4 = 5.25v, v out1 = v out2 = v out3 = v out5 = 3.3v, t a = +25?, unless otherwise noted.) 0 40 20 60 120 100 80 140 0 20 40 60 80 100 120 140 160 180 200 dropout voltage vs. load current max886/88-07 load current (ma) dropout voltage (mv) v in1 = v in2 = v in5 = 3.3v v in3 = 2.85v reg3 reg1 reg5 reg2 5.12 5.14 5.16 5.18 5.20 5.22 5.24 5.26 5.28 0 20406080100 reg4 output voltage vs. load current max886/88-08 load current (ma) output voltage (v) v in4 = 3.75v 0 2 1 4 3 6 5 7 9 8 10 2 456 3 789 11 10 12 shutdown current vs. battery voltage max886/88-09 battery voltage (v) shutdown current ( a) r1, r2, r3 not connected
max886/max888/max1863 wireless and satellite handset power-management ics 8 _______________________________________________________________________________________ 400 s/div reg0 line-transient response (pwm mode) max886/88-13 v batt = 7v to 8v, i out0 = 500ma, v out0 = 3.75v, ac-coupled v batt 500mv/div v out0 100mv/div 400 s/div reg0 load-transient response (pwm mode) max886/88-16 v batt = 5.4v, i out0 = 0 to 500ma, v out0 = 3.75v, ac-coupled i out0 200ma/div v out0 100mv/div 400 s/div reg0 line-transient response (pfm mode) max886/88-14 v batt = 7v to 8v, i out0 = 5ma, v out0 = 3.75v, ac-coupled v batt 500mv/div v out0 100mv/div 400 s/div reg2 line-transient response (in2 connected to out0) max886/88-15 v batt = 7v to 8v, i out2 = 5ma, v out2 = 3.3v, ac-coupled v batt 500mv/div v out2 100mv/div 400 s/div reg0 load-transient response (pfm mode) max886/88-17 v batt = 5.4v, i out0 = 0 to 500ma, v out0 = 3.75v, ac-coupled i out0 200ma/div v out0 100mv/div 400 s/div reg2 load-transient response (in2 connected to batt) max886/88-18 v batt = v in2 = 5.4v, i out2 = 0 to 200ma, v out2 = 3.3v, ac-coupled i out2 200ma/div v out2 100mv/div typical operating characteristics (continued) (circuit of figure 2, reg0 to reg5 outputs at por states, v out0 = 3.75v, v out4 = 5.25v, v out1 = v out2 = v out3 = v out5 = 3.3v, t a = +25?, unless otherwise noted.)
max886/max888/max1863 wireless and satellite handset power-management ics _______________________________________________________________________________________ 9 pin description 9 c+ charge-pump capacitor positive connection 13 lbi low-battery detector input. lbo goes low when v lbi drops below v ref . connect lbi to the center of a resistor voltage-divider between batt and gnd. 15 lbo low-battery output. open-drain output of the low-battery detector comparator. lbo is high impedance when device is shutdown or v lbi > v ref . v lbo is low when v lbi < v ref . typically, connect a 200k ? pullup resistor between lbo and out2. 14 lbhys low-battery detector hysteresis control. an open-drain output to set the hysteresis of the low-battery detector comparator. 11 c- charge-pump capacitor negative connection 12 dgnd digital ground 10 in4 regulator 4 power-supply input 5 ref reference output. bypass with a 0.22? capacitor to gnd. ref can source up to 100?. 7 batt supply voltage input. bypass with a 0.1? and a 10? capacitor to pgnd as close to batt as possible. 8 out4 charge-pump regulator 4 output. bypass with a 10?, low-esr capacitor to dgnd. 6 gnd ground 4 cvl low-side drive bypass. bypass with a 1? capacitor to gnd. 2 pgnd power ground name function 1 lx inductor connection. drain of the internal p-channel mosfet. pin 16 reset reset output. reset remains low during initial power-up for 75ms after out2 is ready. reset has an internal 10k ? pullup resistor connected to out2. reset is valid for v batt down to 1v. 17 in2 linear regulator 2 power-supply input 18 out2 linear regulator 2 output. bypass with a 2.2?, low-esr capacitor to gnd. up to 200ma is available from out2. the reset circuit monitors this voltage. 19 out3 linear regulator 3 output. bypass with a 1?, low-esr capacitor to gnd. up to 20ma is available from out3. 20 in3 regulator 3 power-supply input 21 in5 regulator 5 power-supply input 22 out5 linear regulator 5 output. bypass with a 1?, low-esr capacitor to gnd. up to 100ma is available from out5. 23 in1 regulator 1 power-supply input 3 out0 switching regulator 0 feedback connection
max886/max888/max1863 wireless and satellite handset power-management ics 10 ______________________________________________________________________________________ scl ab cd e fg h i j k sda t su:sta t hd:sta t low t high t su:dat t hd:dat t su:sto t buf a = start condition b = msb of address clocked into slave c = lsb of address clocked into slave d = r/w bit clocked into slave e = slave pulls smbdata line low l m f = acknowledge bit clocked into master g = msb of data clocked into slave (op/sus bit) h = lsb of data clocked into slave i = slave pulls smbdata line low j = acknowledge clocked into master k = acknowledge clock pulse l = stop condition, data executed by slave m = new start condition figure 1. i 2 c-compatible serial-interface timing diagram pin description (continued) power-on input. pulse the on pin low to turn on the ic. on has an internal 16? pullup resistor. on 26 serial interface data input sda 28 on status output. push-pull logic output indicating the state of the on input. the logic state of this pin follows the logic state of the on pin. the logic high output voltage is the output voltage of out2. onstat 27 power-off input. drive off high before the startup timer has expired in order to keep the ic powered on. drive off low to shut down the ic. off has an internal 100k ? pulldown resistor to gnd. off 25 pin linear regulator 1 output. bypass with a 2.2?, low-esr capacitor to gnd. up to 100ma is available from out1. out1 24 function name serial interface clock input scl 29 sync input. drive sync with a logic-level square wave to synchronize the internal oscillator. the capture range for external clock is ?0% of the selected internal oscillator frequency. drive sync low for more than 10? to force low-power pfm mode (standby mode). drive sync high to force pwm mode. sync 30 high-side drive bypass input. bypass cvh with a 0.1? capacitor connected to in0. cvh 31 regulator 0 power-supply input. connect to batt. source of the internal p-channel mosfet. in0 32
max886/max888/max1863 wireless and satellite handset power-management ics ______________________________________________________________________________________ 11 batt in1 cvh lbi lbhys gnd ref scl in0 lx pgnd out0 in2 out1 out2 lbo reset out3 out4 in3 out5 onstat max886 in4 in5 sda on off sync dgnd r1 1.1m ? c4 0.1 f c2 0.1 f in 4v to 12v c1 10 f r2 562k r3 23.3k c5 0.22 f cvl c+ c- c3 1 f c6 0.22 f c8 2.2 f c7 2.2 f out1 up to 100ma out0 up to 500ma d1 mbr0520l l1 10 h c9 1 f c12 10 f out3 up to 20ma r5 200k out4 5.25v up to 100ma c10 1 f out5 up to 100ma out2 up to 200ma c11 10 f figure 2a. typical 2 li+ or 5 to 6 ni-cell application circuit (max886)
max886/max888/max1863 wireless and satellite handset power-management ics 12 ______________________________________________________________________________________ batt in1 cvh lbi lbhys gnd ref scl in0 lx pgnd out0 in2 out1 out2 lbo reset out3 out4 in3 out5 onstat max888 max1863 in4 in5 sda on off sync dgnd r1 619k c4 0.1 f c2 0.1 f in 2.7v to 5.5v c1 10 f r2 562k r3 47.6k c5 0.22 f cvl c+ c- c3 1 f c6 0.22 f c8 2.2 f c7 2.2 f out1 up to 100ma out0 up to 500ma d1 mbr0520l l1 10 h c9 1 f c12 10 f out3 up to 20ma r5 200k out4 5.25v up to 100ma c10 1 f out5 up to 100ma out2 up to 200ma c11 10 f figure 2b. typical 1 li+ or 3 to 4 ni-cell application circuit (max888/max1863)
max886/max888/max1863 wireless and satellite handset power-management ics ______________________________________________________________________________________ 13 detailed description the max886/max888/max1863 contain one high-effi- ciency, step-down dc-dc converter, four low-dropout linear regulators, and one regulated charge pump. the output voltages of the switching regulator and the linear regulators are software-programmable through the seri- al interface. the regulated charge-pump output is facto- ry set at 5.25v. the devices also include reset and startup timers and a low-battery detect comparator (figure 3). 500ma dc-dc buck regulator 0 regulator 0 is a low-noise, step-down, synchronous dc-dc converter that can source a minimum of 500ma. high-operating frequency (up to 925khz) mini- mizes output voltage ripple and reduces the size and cost of external components. guaranteed 100% duty- cycle operation provides the lowest possible dropout voltage, extending the useful life of the battery supply. the serial interface programs v out0 from 2.625v to 3.75v in 75mv steps for the max886 (tables 1 and 2), 5 in1 out1 in2 out2 in3 out3 in5 out5 cvh cvl in0 batt out0 c+ c- pgnd in4 out4 onstat lbo on1 on2 on5 on0 lx on4 sda scl sync reset on off lbi ref lbhys dgnd logic decoder reset and startup timer reg4 charge pump regulator oscillator switching regulator linear reg1 linear reg5 ref dac5 dac0 dac2 dac1 linear reg2 dac3 linear reg3 out2 10k + gnd on2 figure 3. max886/max888/max1863 functional diagram
max886/max888/max1863 wireless and satellite handset power-management ics 14 ______________________________________________________________________________________ or from 1.527v to 3.027v in 100mv steps for the max888/max1863 (tables 1 and 3). regulator 0 operates in one of four preset frequencies, from 375khz to 925khz, programmable through the serial interface (table 4). for the device to power up properly, v in0 must be high enough for reg0 to get into regulation. for the max886, regulator 0? default voltage is 3.75v. since the rest of the regulators do not power up until regulator 0 is ready, v in0 must be greater than approximately 4v for the device to power up properly. the regulator 0 default voltage for the max888 is 2.027v, and 1.827v for the max1863, so the minimum v in0 required to start up is limited by the minimum operating voltage range (2.7v). after power-up, the device operates until v batt drops below v uvlof (undervoltage lockout falling threshold). sync mode the sync input allows the max886/max888/max1863 to synchronize with an external clock applied to sync, ensuring that switching harmonics are kept away from sensitive if bands. the sync detector triggers on sync? falling edge. pwm mode regulator 0 is in pwm mode when sync is connected to cvl or driven to a logic-high voltage. two internal switch- es operate at a preset frequency even when there is no load. the p-channel mosfet turns on to charge the inductor until the error comparator or current-limit com- parator turns it off. the n-channel mosfet then turns on to discharge the inductor. to prevent the output from soaring with no load in pwm mode, the n-channel switch stays on long enough to allow the inductor current to go negative. once the n-channel switch turns off, the voltage at lx rises (rings) until the next cycle when the p-channel switch turns on again. as the load increases and the inductor enters continuous conduction, ringing is no longer present and the lx waveform looks like a square wave whose duty cycle depends on the input and output voltages. as the input voltage approaches the same level as the output voltage, the p-channel switch stays on 100% of the time, providing the lowest possible dropout. pfm mode regulator 0 operates in pfm mode when sync is dri- ven to a logic low voltage or connected to gnd. when v out0 drops below the regulation threshold, the p- channel switch turns on to charge the inductor until the error comparator or current-limit comparator turns it off. at light loads, the n-channel then turns on to discharge the inductor until the current in the inductor reaches zero. in pfm mode, the inductor current does not go negative to discharge the output. at no-load there is a long period between pulses of inductor current. as the load current increases, the period between pulses becomes shorter until the pulses become continuous. at load currents above this point, regulator 0 automatically switches to pwm mode, and the v lx waveform looks like a square wave whose duty cycle depends on the input and output voltages. as the input voltage approaches the same level as the output voltage, the p-channel switch stays on 100% of the time, providing the lowest possible dropout. it is typically more efficient to use the pfm mode when the load current is less than 100ma. 100ma ldo regulator 1 regulator 1, a low-dropout linear regulator, sources a minimum of 100ma and operates from voltages up to 12v at in1. the serial interface programs v out1 from 2.7v to 4.95v in 75mv steps for the max886 (tables 1 and 2), or from 1.25v to 3.50v in 150mv steps for the max888/max1863 (tables 1 and 3). in1 may be pow- ered from the battery, out0, or any other voltage source. 200ma ldo regulator 2 regulator 2, a low-dropout linear regulator, sources a minimum of 200ma. the serial interface programs v out2 from 2.175v to 3.3v in 75mv steps for the max886 (tables 1 and 2), or from 1.527v to 3.027v in 100mv steps for the max888 /max1863 (tables 1 and 3). in2 may be pow- ered from the battery, out0, or any other voltage source less than 5.5v. 20ma ldo regulator 3 regulator 3, a low-dropout linear regulator, sources a minimum of 20ma. the serial interface programs v out3 to one of four different output voltages: 0v, 2.85v, 4.65v, or v out2 (tables 1 and 5). although this is a general- purpose output, out3 is intended for the sim supply. in3 may be powered from out4 or from any regulated 5v supply. when programmed to 0v or v out2 , out3 is either actively discharged to gnd (for 0v mode) or connected to out2 (for v out2 ), and regulator 3 is disabled to conserve power. 100ma charge-pump regulator 4 regulator 4, a regulated charge pump, generates 5.25v and delivers up to 100ma. an oscillator synchronized to the pwm clock regulates out4 to minimize noise. it operates at one-half the frequency of the pwm oscillator to ensure 50% duty-cycle outputs. in4 may be powered from the bat- tery, out0, or any other voltage source less than 5.5v. to save space and cost, use a small ceramic flying capacitor. see table 6 for recommended flying capaci- tor values.
max886/max888/max1863 wireless and satellite handset power-management ics ______________________________________________________________________________________ 15 100ma ldo regulator 5 regulator 5, a low-dropout linear regulator, can source a minimum of 100ma. the output voltage is programmable from 2.175v to 3.3v in 75mv steps for the max886 (tables 1 and 2), or 1.25v to 3.50v in 150mv steps for the max888 /max1863 (tables 1 and 3). in5 may be pow- ered from the battery, out0, or any other voltage source less than 5.5v. control data byte the control byte is 8 bits long (4 address bits, 4 data bits). each regulator has a dac that sets the output regulation voltage. control codes are summarized in table 1. table 1. control data byte table 2. max886 output voltage settings note: the output voltage of each regulator can be set independently. the por states are in boldface. 0 0 0 address 1 0 0 1 0 dac0 data dac1 0 dac5 0 out5 output voltage 0 0 0 1 1 1 a2 dac3 dac2 f osc a0 a1 function d2 d0 lsb 0 out2 output voltage 0 out0 output voltage 0 out3 output voltage, f osc 0 out1 output voltage d1 1 d3 1 0 a3 msb on4 on1 on2 on5 1 1 0 1 1 1 x x on0 x x x x x 0 out0 on/off control 0 not available 0 out1, 2, 4, 5 on/off control x x x x x x x 1 not available 2.70 2.85 2.625 2.700 0 0 0 1 0 0 0 dacx data 0 3.00 3.15 regulator output voltage (v) 2.775 2.850 0 0 0 2.175 1 1 1 2.250 0 0 2.325 2.400 3.30 3.45 2.925 3.000 1 1 0 1 0 0 0 0 3.60 3.75 out1 3.075 3.150 1 1 0 2.475 1 1 1 2.550 0 0 2.625 2.700 3.90 4.05 out0 d2 3.225 3.300 0 0 0 1 0 0 1 1 4.20 4.35 d0 d1 3.375 3.450 0 0 0 2.775 1 1 1 2.850 1 1 2.925 3.000 4.50 4.65 d3 out5 3.525 3.600 1 1 0 1 0 0 1 1 4.80 4.95 out2 3.675 3.750 1 1 0 3.075 1 1 1 3.150 1 1 3.225 3.300 2.175 2.250 2.325 2.400 2.475 2.550 2.625 2.700 2.775 2.850 2.925 3.000 3.075 3.150 3.225 3.300
max886/max888/max1863 wireless and satellite handset power-management ics 16 ______________________________________________________________________________________ low-battery detector a low-battery comparator detects low-battery condi- tions. the trip threshold is internally set to v ref (1.25v typ). lbhys sets the hysteresis with external resistors. lbo and lbhys have open-drain outputs. the exter- nally set low-battery threshold must be higher than the uvlof threshold (2.45v typical). set the threshold and hysteresis by connecting resis- tors r1 (between batt and lbi), r2 (between lbi and lbhys), and r3 (lbhys and gnd) (figure 2). after choosing the upper and lower thresholds, calcu- late the resistor values as follows: 1) choose a value for r1. typical values range from 500k ? to 1.5m ? . 2) calculate r2: 3) calculate r3: r3 r2 v v r1 v v v thf ref ref ref thf = ? () ? ? r r v v thr ref 2 1 1 ? = ? ? ? ? ? ? table 3. max888/max1863 output voltage settings table 5. out3 output voltage setting table 4. oscillator frequency setting 0 0 0 1 0 0 0 0 0 0 0 1.25 1 1 1 1.40 0 0 1.55* 1.70 1 1 0 1 0 0 0 0 1 1 0 1.85 1 1 1 2.00 0 0 2.15 2.30 0 0 0 1 0 0 1 1 0 0 0 2.45 1 1 1 2.60 1 1 2.75 2.90 1 1 0 1 0 0 1 1 1 1 0 3.05** 1 1 1 3.20 1 1 3.35 3.50 1.527 1.627 1.727 1.827 1.927 2.027 2.127 2.227 2.327 2.427 2.527 2.627 2.727 2.827* 2.927** 3.027 1.25 1.40 1.55* 1.70 1.85 2.00 2.15 2.30 2.45 2.60 2.75 2.90** 3.05 3.20 3.35 3.50 1.527 1.627 1.727 1.827** 1.927 2.027* 2.127 2.227 2.327 2.427 2.527 2.627 2.727 2.827 2.927 3.027 regulator output voltage (v) dacx data out1 out0 d2 d0 d1 d3 out5 out2 note: the output voltage of each regulator can be set independently. the por states are in boldface. 0 0 x x 0 1 d3 d1 d2 address 03h data 0v (reg3 off)** 2.85v x x d0 1 1 x x 0 1 x x 4.65v vout2 (reg3 off)* x x 0 0 x x 0 1 d0 x x 1 1 x x 0 1 d3 d1 d2 670 925 address 03h data f osc (khz) 375 535 note: the por states are in boldface. note: the por states are in boldface. *max888 **max1863 *max888 **max1863
max886/max888/max1863 wireless and satellite handset power-management ics ______________________________________________________________________________________ 17 for example: v ref = 1.25v v thf = falling threshold = 2.52v v hys = hysteresis = 0.1v v thr = rising threshold = v thf + v hys = 2.62v r1 = 619k ? (1%) r2 = 562k ? (1%) r3 = 47.6k ? (1%) power-on sequence (including r r e e s s e e t t and startup timers) drive on low to begin the power-up sequence. to reduce overall system cost and complexity, the max886/max888/ max1863 incorporate reset and startup timers with the power-on sequence. the max886/max888/max1863 turn on the reference when on goes low. once the reference is fully pow- ered up, if the input voltage exceeds the internal under- voltage-lockout threshold (uvlor), regulator 0 turns on. once out0 is in regulation, out2 and out4 turn on. once out2 is in regulation, out1 and out5 turn on and the 75ms reset timer begins. reset remains low from the time out2 is valid until the reset timer times out. after the reset period expires, a 50ms startup timer begins. the max886/max888/max1863 shut down if the external logic or controller fails to drive off high before the startup timer expires. drive off high to continue operation. driving off low turns off the ic. there is no required sequence to power off any regula- tor after the device has turned on. regulators can be powered off selectively by sending the correct code through the serial interface (table 1). onstat output onstat is a logic output that follows on . connect onstat to the external logic or controller to sense when the on pin has been brought low to request shut- down. this allows easy implementation of a one-button on/off control scheme (figure 4). thermal overload protection an internal thermal sensor shuts the max886/max888/ max1863 down when the maximum temperature limit is exceeded (160? typical). i 2 c-compatible serial interface use an i 2 c-compatible serial interface to turn the max886/max888/max1863 on and off, as well as con- trol each regulator? output voltage and program the dc-dc converter and charge pump? oscillator frequen- cy. use standard i 2 c-compatible receive-byte com- mands to program the ic. this part is always a slave to the bus master. the chip address is 1001 111. por state the power-on reset state of all the dac and frequency registers is 0fh, except for dac1 which is 04h. the power-on reset state of the onx bits is 1 (table 1). the power-on voltage for each regulator is shown in bold in tables 2, 3, and 5. applications information inductor selection the essential parameters for inductor selection are inductance and current rating. the max886/max888/ max1863 operate with a wide range of inductance val- ues. in many applications, values between 10? and 68? take best advantage of the controller? high switch- ing frequency. calculate the minimum inductance value using the sim- plified equation: where i peak is the peak inductor current (0.9a) and f osc is the switching frequency. for example, for a 6v battery voltage, a desired v out0 is 3.3v, the oscillator frequency is 375khz, and 15? is the minimum inductance required. diode selection the max886/max888/max1863s?high switching fre- quency demands a high-speed rectifier. schottky diodes, such as the 1n5817?n5822 family or surface- mount mbr0520l series, are recommended. ultra- l 4v v i f v / v min batt max out0 peak osc batt out0 () () = ? ? ? ? ? () max886 max888 max1863 c reset out2 onstat on off 10k figure 4. one-button on/off control with onstat
max886/max888/max1863 wireless and satellite handset power-management ics 18 ______________________________________________________________________________________ high-speed rectifiers with reverse recovery times around 50ns or faster, such as the mur series, are acceptable. ensure that the diode? peak current rating exceeds the peak current (1a), and that its breakdown voltage exceeds v batt . schottky diodes are preferred for heavy loads due to their low forward voltage, espe- cially in low-voltage applications. capacitor selection choose filter capacitors to service input and output peak currents with acceptable voltage ripple. the capacitor? equivalent series resistance (esr) is a major contributor to ripple; therefore, low-esr capaci- tors are recommended for out1?ut5. a tantalum capacitor is recommended for out0 (see figures 2a and 2b, and table 6). the input filter capacitor reduces peak currents drawn from the power source, and reduces noise and voltage ripple on the input, which are caused by the circuit? switching action. since the current from the battery is interrupted each time the pmos switch opens, pay spe- cial attention to the ripple current rating of the input filter capacitor and use a low-esr capacitor. choose input capacitors with working voltage ratings higher than the maximum input voltage. input capacitors prevent spikes and ringing on the power source from obscuring the current-feedback signal and causing jitter. bypass ref with 0.22? to gnd. the capacitor should be placed within 0.2 inches of the ic, next to ref, with a direct trace to gnd. table 6. out0 and out4 regulator component recommendations table 7. component suppliers layout considerations high-frequency switching regulators are sensitive to pc board layout. poor layout introduces switching noise into the current and voltage-feedback signals, resulting in jitter, instability, or degraded performance. place the anode of the schottky diode and the ground pins of the input and output capacitors close together, and route them to a common ?tar-ground?point. place compo- nents and route ground paths so as to prevent high currents from causing large voltage gradients between the ground pin of the output filter capacitor, the con- troller ic, and the reference bypass capacitor. keep the extra copper on the component and solder sides of the pc board rather than etching it away, and connect it to ground for use as a pseudoground plane. refer to the max886/max888 evaluation kit for a two-layer pc board layout example. component suppliers table 7 lists component suppliers. 925 670 0.22 0.33 10 15 10 15 c12 (f) 535 375 0.47 1 22 33 22 33 f osc (khz) c6 (f) l1 (h) 10 15 22 33 c11 (f) avx 803-946-0690 coilcraft 847-639-6400 803-626-3123 516-241-7876 847-639-1469 605-668-4131 coiltronics dale 516-241-9339 605-665-1627 company fax phone internal rectifier 310-322-3331 motorola 602-303-5454 310-322-3332 619-661-6835 602-994-6430 408-988-8000 sanyo sprague 619-661-1055 408-970-3950 847-956-0666 sumida 847-956-0702 chip information transistor count: 2042
max886/max888/max1863 wireless and satellite handset power-management ics ______________________________________________________________________________________ 19 max886 max888 max1863 top view 32 28 29 30 31 25 26 27 cvh sync scl sda in0 onstat on off 10 13 15 14 16 11 12 9 c+ c- in4 lbi dgnd lbo lbhys reset 17 18 19 20 21 22 23 in1 24 out1 out5 in5 in3 out3 out2 in2 2 3 4 5 6 7 8 out4 batt gnd ref cvl out0 pgnd 1 lx tqfp pin configuration
max886/max888max1863 wireless and satellite handset power-management ics maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circu it patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. 20 ____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 2001 maxim integrated products printed usa is a registered trademark of maxim integrated products. package information 32l/48l , tqfp.eps

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