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high-performance negative charge pump for 7 white leds in 3mm x 3mm thin qfn max8848y/max8848z evaluation kit available 19-5233; rev 0; 4/10 typical operating circuit general description the max8848y/max8848z negative charge pumps drive up to 7 white leds with regulated constant current for display backlight applications. by utilizing an invert - ing charge pump and extremely low-dropout adaptive current regulators, these ics achieve very high efficiency over the full 1-cell li+ battery voltage range even with large led forward voltage mismatch. the 1mhz fixed- frequency switching allows for tiny external components. the regulation scheme is optimized to ensure low emi and low input ripple. the max8848y/max8848z include thermal shutdown, open- and short-circuit protection. the max8848y/max8848z support independent led on/off and dimming control. the max8848y dimming ranges are pseudo-logarithmic from 24ma to 0.1ma and off in 32 steps. all devices include a temperature derat - ing function to safely allow bright 24ma full-scale output current while automatically reducing current gradually to protect leds at high ambient temperatures above +60 n c. the max8848y/max8848z are available in 16-pin, 3mm x 3mm thin qfn packages. applications white led backlightingcellular phones pdas, digital cameras, and camcorders features s negative 1x/1.5x charge pump s adaptive current regulators s independent voltage supply for each led s 24ma to 0.1ma serial-pulse dimming (max8848y) s 24ma to 0ma pwm dimming (max8848z) s 2% (max) led current accuracy, 1% (typ) matching s low 120a quiescent current s low 0.4a shutdown current s inrush current limit s temperature derating function s 16-pin, 3mm x 3mm thin qfn packages ordering information note: all devices are specified over the -40c to +85c extended temperature range.+ denotes a lead(pb)-free/rohs-compliant package. * ep = exposed pad. 1 f input 2.7v to 5.5v in neg led1 d1d2 d3 d4 d5 d6 d7 led2led3 led4 led5 led6 led7 ep c1p c1n c2p c2n gndena (enb) led enable and dimming control 1 f 0.22 f note: ( ) for max8848y, < > for max8848z 1 f 1 f max8848y max8848z part dimming pin-package top mark max8848y ete+t serial pulse/ pwm 16 thin qfn-ep* ahq max8848z ete+t pwm 16 thin qfn-ep* ahp for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim?s website at www.maximintegrated.com. downloaded from: http:///
2 maxim integrated high-performance negative charge pump for 7 white leds in 3mm x 3mm thin qfn max8848y/max8848z stresses beyond those listed under ?absolute maximum ratings? may cause permanent damage to the device. these are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. in to gnd ............................................................. -0.3v to +6.0v in to neg ............................................................. -0.3v to +6.0v neg, c2n to gnd .................................................. -6v to +0.3v c1p, c2p, cpwm, ena, enb to gnd ....... -0.3v to (v in + 0.3v) c2p to c1n ................................................ -0.3v to (v in + 0.3v) led_, c1n, c2n, ena, enb to neg ......... -0.3v to (v in + 0.3v) continuous power dissipation (t a = +70c) 16-pin thin qfn multilayer pcb (derate 20.8mw/c above +70c) ..........................1666.7mw junction-to-case thermal resistance ( jc ) (note 1) ..... 10c/w junction-to-ambient thermal resistance ( ja ) (note 1) multilayer pcb .............................................................. 48c/w operating temperature range .......................... -40c to +85c junction temperature ..................................................... +150c storage temperature range ............................ -65c to +150c lead temperature (soldering, 10s) ................................ +300c soldering temperature (reflow) ...................................... +260c electrical characteristics (v in = 3.6v, v gnd = 0v, t a = -40c to +85c, unless otherwise noted. typical values are at t a = +25c.) (note 2) absolute maximum ratings note 1: package thermal resistances were obtained using the method described in jedec specification jesd51-7, using a four-lay - er board. for detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial . parameter conditions min typ max units in operating voltage 2.7 5.5 v undervoltage lockout (uvlo) threshold v in rising 2.35 2.45 2.55 v undervoltage lockout hysteresis 100 mv in shutdown supply current v en _ = 0v, all outputs off t a = +25 n c 0.4 2.5 f a t a = +85 n c 0.4 in operating supply current charge pump inactive, 2 leds enabled at 0.1ma setting 120 150 f a charge pump active, 1mhz switching, all leds enabled at 0.1ma setting 1.6 ma thermal shutdown threshold +160 n c thermal shutdown hysteresis 20 n c pwm dimming control (max8848z)pwm low-level input 0.4 v pwm high-level input 1.4 v en_ pwm input signal frequency range c cpwm = 0.22 f f 0.2 200 khz pwm dimming filter corner frequency c cpwm = 0.22 f f 2 hz current dimming range duty cycle = 0 to 100% 0 24 ma pwm dimming resolution 1% p duty cycle p 100% 0.24 ma/% serial-pulse logic (max8848y) en_ logic input high voltage 1.4 v en_ logic input low voltage 0.4 v en_ logic-input current v il = 0v or v ih = 5.5v t a = +25 n c -1 0.01 +1 f a t a = +85 n c 0.1 downloaded from: http:///
3 maxim integrated high-performance negative charge pump for 7 white leds in 3mm x 3mm thin qfn max8848y/max8848z electrical characteristics (continued) (v in = 3.6v, v gnd = 0v, t a = -40c to +85c, unless otherwise noted. typical values are at t a = +25c.) (note 2) note 2: limits are 100% production tested at t a = +25c. limits over the operating temperature range are guaranteed by design. note 3: guaranteed by design. not production tested. note 4: led dropout voltage is defined as the led_ to gnd voltage at which current into led_ drops 10% from the value at v led_ = 0.5v. parameter conditions min typ max units en_ low shutdown delay t shdn 5 8 ms en_ t lo see figure 2 1 500 f s en_ t hi see figure 2 1 f s initial en_ t init see figure 2, first en_ high pulse 120 f s charge pump switching frequency 1 mhz soft-start time 0.5 ms output regulation voltage v in - v neg 4.3 5 v open-loop neg output resistance (v neg - 0.5 x v in )/i neg 2 4 i neg shutdown discharge resistance v en _ = 0v, all outputs off 10 k i led1?led7 current regulator current setting range serial-pulse interface or pwm 0.1 24.0 ma led_ current accuracy v led_ = 0.5v for charge pump inactive, v led_ = -0.9v, v neg_ = -1.4v 24ma setting, t a = +25 n c -2 q 1 +2 % 24ma setting, t a = -40 n c to derating function start temperature (note 3) -5 +5 1.6ma setting, t a = +25 n c q 5 derating function start temperature +60 n c derating function slope from derating function start temperature -2.5 %/ n c led_ dropout voltage (note 4) charge pump inactive, 24ma setting t a = +25 n c 85 125 mv t a = +85 n c 95 charge pump active, 24ma setting t a = +25 n c 110 t a = +85 n c 124 led_ current regulator switchover threshold (inactive to active) v led_ falling 135 150 165 mv led_ current regulator switchover hysteresis 100 mv led_ leakage in shutdown all leds off t a = +25 n c 0.01 5 f a t a = +85 n c 0.1 downloaded from: http:///
4 maxim integrated high-performance negative charge pump for 7 white leds in 3mm x 3mm thin qfn max8848y/max8848z typical operating characteristics (v in = 3.6v, v en_ = v in , circuit of figure 1, t a = +25c, unless otherwise noted.) input voltage ripple (peak-to-peak) vs. input voltage max8848y toc09 input voltage (v) input voltage ripple (mv) 3.9 3.6 3.3 3.0 10 20 30 40 0 2.7 4.2 20.8ma/led max8848y 6.4ma/led 16.0ma/led 1.6ma/led leds have mismatched v f v in falling input current vs. li+ battery voltage (7 mismatched leds) max8848y toc08 li+ battery voltage (v, time weighted) supply current (ma) 3.4 3.5 3.6 3.7 3.8 3.9 50 100 150 200 250 0 4.2 3.0 20.8ma/led 6.4ma/led 16.0ma/led 1.6ma/led supply current vs. supply voltage (7 mismatched leds) max8848y toc07 supply voltage (v) supply current (ma) 3.9 3.6 3.3 3.0 50 100 150 200 20.8ma/led 6.4ma/led 16.0ma/led 1.6ma/led v in falling 250 0 2.7 4.2 supply current vs. li+ battery voltage (7 matched leds) max8848y toc06 li+ battery voltage (v, time weighted) supply current (ma) 3.4 3.5 3.6 3.7 3.8 3.9 50 100 150 200 250 0 4.2 3.0 20.8ma/led 6.4ma/led 16.0ma/led 1.6ma/led supply current vs. supply voltage (7 matched leds) max8848y toc05 supply voltage (v) supply current (ma) 3.9 3.6 3.3 3.0 50 100 150 200 20.8ma/led 6.4ma/led 16.0ma/led 1.6ma/led 250 0 2.7 4.2 v in falling efficiency vs. li+ battery voltage (7 mismatched leds) max8848y toc04 li+ battery voltage (v, time weighted) efficiency p led /p batt (%) 3.4 3.5 3.6 3.7 3.8 3.9 60 1.6ma/led 70 80 90 100 50 4.2 3.0 6.4ma/led 20.8ma/led 16ma/led efficiency p led /p batt (%) efficiency vs. supply voltage (7 mismatched leds) max8848y toc03 supply voltage (v) 3.9 3.6 3.3 3.0 60 70 80 90 20.8ma/led 6.4ma/led 1.6ma/led 16.0ma/led 100 50 2.7 4.2 v in falling efficiency vs. li+ battery voltage (7 matched leds) max8848y toc02 li+ battery voltage (v, time weighted) efficiency p led /p batt (%) 3.4 3.5 3.6 3.7 3.8 3.9 60 1.6ma/led 70 80 90 100 50 4.2 3.0 6.4ma/led 20.8ma/led 16ma/led efficiency vs. supply voltage (7 matched leds) max8848y toc01 supply voltage (v) efficiency p led /p batt (%) 3.9 3.6 3.3 3.0 60 70 80 90 20.8ma/led 6.4ma/led v in falling 16.0ma/led 1.6ma/led 100 50 2.7 4.2 downloaded from: http:///
5 maxim integrated high-performance negative charge pump for 7 white leds in 3mm x 3mm thin qfn max8848y/max8848z typical operating characteristics (continued)(v in = 3.6v, v en_ = v in , circuit of figure 1, t a = +25c, unless otherwise noted.) 1.5x mode operating waveform (v in = 3v) max8848y toc13 100ma/div20ma/div 0a0a 100mv/divac-coupled v in i in i iled1 all leds on24ma/led 1s/div 1x mode operating waveform (v in = 4v) max8848y toc12 100ma/div20ma/div 0a0a 100mv/divac-coupled v in i in i iled1 all leds on24ma/led 1s/div single-wire serial-pulse dimming response (max8848y) max8848y toc15 20ma/div 0a 0v50ma/div 0a 5v/div 1x modeall leds operating v ena = v enb total i led i led1 10ms/div startup and shutdown response (max8848y) max8848y toc14 200mv/divac-coupled 200ma/div 20ma/div 0a0a 2v/div v ena/enb v in i n i iled1 ena = enb24ma/led 2ms/div led current vs. temperature max8848y toc11 temperature (c) led current (ma) 60 35 10 -15 5 10 15 20 25 30 0 -40 85 24ma/led led current matching vs. supply voltage max8848y toc10 supply voltage (v) led current (ma) 5.1 4.7 3.9 4.3 3.5 3.1 15.2 15.4 15.6 15.8 16.0 16.2 16.4 16.6 16.8 17.0 max8848y16ma/led, v in falling 15.0 2.7 5.5 downloaded from: http:///
6 maxim integrated high-performance negative charge pump for 7 white leds in 3mm x 3mm thin qfn max8848y/max8848z typical operating characteristics (continued)(v in = 3.6v, v en_ = v in , circuit of figure 1, t a = +25c, unless otherwise noted.) pwm dimming linearity pwm duty cycle (%) led current (ma) 80 60 40 20 5 10 15 20 25 0 0 100 max8848y toc20 max8848z pwm dimming response max8848y toc19 20ma/div 5v/div v ena 12ma i in i led1 100ma/div0a 40s/div max8848z line transient response (v in = 3.5v to 3.0v to 3.5v) max8848y toc18 20ma/div 0a 100ma/div0a 1v/div 3.5v 3.5v 3.0v 16ma i in v in i led1 1ms/div all leds on16ma/led line transient response (v in = 3.8v to 3.4v to 3.8v) max8848y toc17 20ma/div 0a 200ma/div0a 1v/div 3.8v 3.8v 3.4v i in v in i led1 1ms/div all leds on24ma/led line transient response (v in = 4.3v to 3.8v to 4.3v) max8848y toc16 20ma/div 0a 200ma/div0a 1v/div 4.3v 4.3v 3.8v i in v in i led1 1ms/div all leds on24ma/led downloaded from: http:///
7 maxim integrated high-performance negative charge pump for 7 white leds in 3mm x 3mm thin qfn max8848y/max8848z pin description pin configuration 1516 14 13 65 7 gnd c2p 8 in led4led2 led5 12 led7 4 12 11 9 cpwm (enb) ena ep ( ) for max8848y only led1neg c1n c2n max8848y max8848z c1p led3 3 10 led6 thin qfn top view + pin name function max8848y max8848z 1 1 in supply voltage input. the input voltage range is 2.7v to 5.5v. bypass in to gnd with a 1 f f ceramic capacitor as close as possible to the ic. in is high imped - ance during shutdown. connect in to the anodes of all the leds. 2 2 gnd ground. connect gnd to system ground and the input bypass capacitor as close as possible to the ic. 3 3 c1p transfer capacitor 1 positive connection. connect a 1 f f ceramic capacitor from c1p to c1n. 4 4 c2p transfer capacitor 2 positive connection. connect a 1 f f ceramic capacitor from c2p to c2n. 5 5 c2n transfer capacitor 2 negative connection. connect a 1 f f ceramic capacitor from c2p to c2n. an internal 10k i resistor pulls c2n to gnd during shutdown. 6 6 c1n transfer capacitor 1 negative connection. connect a 1 f f ceramic capacitor from c1p to c1n. 7 7 neg charge-pump negative output. connect a 1 f f ceramic capacitor from neg to gnd. in shutdown, an internal 10k i resistor pulls neg to gnd. connect the exposed pad to neg directly under the ic. downloaded from: http:///
8 maxim integrated high-performance negative charge pump for 7 white leds in 3mm x 3mm thin qfn max8848y/max8848z pin description (continued) pin name function max8848y max8848z 8?14 8?14 led1?led7 led current regulators. current flowing into led_ is based on the ena/enb input. connect led_ to the cathodes of the external leds. led_ is high imped - ance during shutdown. short any unused led_ to in prior to power-up to disable the corresponding current regulator. 15 ? enb enable and serial-pulse dimming control input b for the max8848y. enb con - trols led6 and led7. drive enb high to turn on the led6 and led7 current regulators at 24ma. drive enb low for greater than 8ms to turn off the current regulators or drive both ena and enb low to place the ic in shutdown. in addi - tion to the enable function, enb can also be used to control the led6 and led7 serial-pulse dimming. ? 15 cpwm filter capacitor connection for pwm dimming for the max8848z. connect a capacitor from cpwm to gnd to form a filter with the internal 360k i resistor. the recommended capacitor for a 2hz corner frequency is 0.22 f f. 16 16 ena enable and pwm/serial-pulse dimming control input a. ena controls led1?led5 for the max8848y, and led1?led7 for max8848z. drive ena high to turn on all the controlled led current regulators at 24ma. drive ena low for greater than 8ms to turn off the current regulators or drive both ena and enb low to place the ic in shutdown. drive ena with a pwm signal from 200hz to 200khz to dim led1?led7 for the max8848z. see the pwm dimming control (max8848z) section. for the max8848y, ena controls the led1?led5 serial-pulse dimming. ? ? ep exposed paddle. connect ep to neg directly under the ic. downloaded from: http:///
9 maxim integrated high-performance negative charge pump for 7 white leds in 3mm x 3mm thin qfn max8848y/max8848z figure 1. functional diagram and application circuit c2 1 f c1 1 f c1p gnd in sel min ep negled1 v in led2led3 led4 led5 led6 led7 current regulator inverting charge pump c1n 1mhzoscillator c3 1 f c41 f c2p c2n fb pwm dimming 360k i led enable current source control thermal derating and protection current regulator c25 0.22 f current regulator current regulator current regulator current regulator current regulator note: () for max8848y only, < > for max8848z only max8848y max8848z enable and dimming control inputs v in 2.7v to 5.5v ena (enb) downloaded from: http:///
10 maxim integrated high-performance negative charge pump for 7 white leds in 3mm x 3mm thin qfn max8848y/max8848z detailed description the max8848y/max8848z have an inverting charge pump and seven current regulators capable of 24ma each to drive up to 7 white leds. the current regulators are matched to within 1% (typ) providing uniform white led brightness for lcd backlight applications. to maxi - mize efficiency, the current regulators operate with as little as 0.15v voltage drop. individual white led current regulators conduct current to gnd or neg to extend usable battery life. in the case of mismatched forward voltage of white leds, only the white leds requiring higher voltage are switched to pull current to neg instead of gnd, further raising efficiency and reducing battery current drain. current regulator switchover when v in is higher than the led forward voltage plus the 150mv dropout voltage of the current regulator, the led current returns through gnd. if this condition is satis - fied for all active white leds, the charge pump remains inactive. when the input voltage drops so that the cur - rent regulator voltage (v led_ ) cannot be maintained for any of the individual white leds, the inverting charge pump activates and generates a voltage on neg that is no greater than 5v below v in . for any current regulator that is detected at the switchover threshold voltage of 150mv (typ, v in falling), internal circuitry switches that current regulator?s return path from gnd to neg to pro - vide enough voltage across that regulator to overcome dropout. when v led_ rises to 250mv (typ), the return of that current regulator is switched back from neg to gnd. each current regulator is independently monitored to detect when switchover is required. since the led current is switched for only the individual led current regulators requiring higher voltage, power consumption is minimized. enable and dimming control input (ena, enb) ena and enb inputs have dual functions: led on/off control and pwm or serial-pulse dimming control. see table 1 for details. for the max8848y, ena functions as on/off control and serial-pulse dimming control for led1? led5. enb functions as on/off control and serial-pulse dimming control for led6 and led7. for the max8848z, only ena functions as on/off control as well as pwm dim - ming control for led1?led7. pwm dimming control (max8848z) when v in is above its undervoltage lockout threshold, uvlo, apply a pwm signal to ena to set the corre - sponding wled current (see table 1) that is proportional to the signal duty cycle (0% duty cycle corresponds to zero led current and 100% duty cycle corresponds to full led current). the allowed pwm frequency range is from 200hz to 200khz. if pwm dimming control is not required, ena works as a simple on/off control. serial-pulse dimming control (max8848y) the max8848y uses ena/enb as a serial-pulse control interface to program the intensity of led1?led7. when the leds are enabled by driving ena/enb high, the max8848y ramps led current to 24ma. subsequent pulses on ena/enb reduce the led current from 24ma to 0.1ma in 31 steps. after the current reaches 0.1ma, the next pulse restores the current to 24ma. see table 2 table 1. ena and enb enable and dimming control part ena enb max8848y led1?led5 enable and serial-pulse dimming control led6 and led7 enable and serial-pulse dimming control max8848z led1?led7 enable and pwm dimming control ? downloaded from: http:///
11 maxim integrated high-performance negative charge pump for 7 white leds in 3mm x 3mm thin qfn max8848y/max8848z for the led current values and the corresponding ena/ enb pulse count. figure 2 shows a timing diagram for ena/enb. if dimming control is not required, ena/enb works as a simple on/off logic control. drive ena/enb high for at least 120 f s to enable the led current regulators, or drive ena/enb low for greater than 8ms (typ) to place the led current regulators in shutdown. the led current regulators operate at 100% brightness and off under these conditions. figure 2. timing charateristics for led serial-pulse dimming controltable 2. ena/enb serial-pulse dimming count and programmed led_ currents en_ i led_ shdn initial t hi t init > 120 s 1 s to 500 s > 1 s t lo t hi shdn t shdn 8ms (typ) 24ma 22.4ma 0 123 45 26 27 28 29 30 31 20.8ma 19.2ma 17.6ma 16.0ma 0.6ma 0.5ma 0.4ma 0.3ma 0.2ma 0.1ma 24ma 22.4ma en_ pulse count programmed led_ current (ma) en_ pulse count programmed led_ current (ma) startup or en_high 24.0 16 2.8 1 22.4 17 2.4 2 20.8 18 2.0 3 19.2 19 1.6 4 17.6 20 1.4 5 16.0 21 1.2 6 14.4 22 1.0 7 12.8 23 0.8 8 11.2 24 0.7 9 9.6 25 0.6 10 8.0 26 0.5 11 6.4 27 0.4 12 5.6 28 0.3 13 4.8 29 0.2 14 4.0 30 0.1 15 3.2 31 24.0 downloaded from: http:///
12 maxim integrated high-performance negative charge pump for 7 white leds in 3mm x 3mm thin qfn max8848y/max8848z low led current levels the max8848y internally generates a pwm signal to obtain higher resolution at lower currents. see the single- wire serial-pulse dimming response (max8848y) graph in the typical operating characteristics section. when the led current is set below 6.4ma, the ic adjusts not only led dc current, but the duty cycle that is controlled by the pwm signal. the frequency of the pwm dimming signal is set at 16khz with a minimum duty cycle of 1/8 to avoid the led flickering effect to human eyes and also to avoid interference in the audio frequency range. table 3 shows the current level and the corresponding duty cycle. shutdown mode the max8848y/max8848z are in shutdown mode when both ena and enb are held low for 8ms or longer. in shutdown, neg is pulled to gnd with a 10k ? internal resistor. temperature derating function the max8848y/max8848z contain a derating func - tion that automatically limits the led current at high temperatures in accordance with the recommended derating curve of popular white leds. the derating function enables the safe usage of higher led current at room temperature, thus reducing the number of leds required to backlight the display. the derating circuit lowers the led current at approximately 2.5%/c once the die temperature is above +60c. the typical derating function characteristic is shown in the typical operating characteristics . power-up led short detection and open-fault protection the max8848y/max8848z contain special circuitry to detect short-circuit conditions at power-up and disable the corresponding current regulator to avoid wasting battery current. connect any unused led_ to in to dis - able the corresponding current regulator. if an led fails short-circuit detection after startup, the current regulator continues the current regulated operation until ic power is cycled and the short circuit is detected during the subsequent startup. an open-circuit led failure drives the voltage on the cor - responding led current regulator output below the swi - tchover threshold, enabling the negative charge pump. thermal shutdown the max8848y/max8848z include a thermal-limit circuit that shuts down the ic above approximately +160c. the ic turns on after it cools by approximately 20c. applications information input ripple for led drivers, input ripple is more important than output ripple. the amount of input ripple depends on the source supply?s output impedance. add a lowpass filter to the input of the max8848y/max8848z to further reduce input ripple. alternatively, increasing c in from 1.0f to 2.2f (or 4.7f) cuts input ripple in half (or in fourth) with only a small increase in footprint. capacitor selection ceramic capacitors are recommended due to their small size, low cost, and low esr. select ceramic capacitors that maintain their capacitance over temperature and dc bias. capacitors with x5r or x7r temperature character - istics generally perform well. recommended values are shown in the typical operating circuit . using a larger value input capacitor helps to reduce input ripple (see the input ripple section). pcb layout and routing the max8848y/max8848z are high-frequency switched-capacitor voltage inverters. for best circuit performance, use a solid ground plane and place all capacitors as close as possible to the ic. use large traces for the power-supply inputs to minimize losses due to parasitic trace resistance and to route heat away from the device. refer to the max8848z evaluation kit data sheet for an example pcb layout. table 3. internal pwm duty cycle vs. led set current *maximum i led is the full reference current when the internal pwm signal has 100% duty cycle at the lower level currents. i led (ma) maximum i led (ma)* duty cycle (n/8) i led (ma) maximum i led (ma)* duty cycle (n/8) 6.4 6.4 8 1.2 1.6 6 5.6 6.4 7 1.0 1.6 5 4.8 6.4 6 0.8 0.8 8 4.0 6.4 5 0.7 0.8 7 3.2 3.2 8 0.6 0.8 6 2.8 3.2 7 0.5 0.8 5 2.4 3.2 6 0.4 0.8 4 2.0 3.2 5 0.3 0.8 3 1.6 1.6 8 0.2 0.8 2 1.4 1.6 7 0.1 0.8 1 downloaded from: http:///
13 maxim integrated high-performance negative charge pump for 7 white leds in 3mm x 3mm thin qfn max8848y/max8848z chip information process: bicmos package information for the latest package outline information and land patterns, go to www.maximintegrated.com/packages . note that a ?+?, ?#?, or ?-? in the package code indicates rohs status only. package drawings may show a different suffix character, but the drawing pertains to the package regardless of rohs status. package type package code document no. 16 thin qfn-ep t1633+5 21-0136 downloaded from: http:///
high-performance negative charge pump for 7 white leds in 3mm x 3mm thin qfn max8848y/max8848z maxim integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim integrated product. no circuit patent licenses are implied. maxim integrated reserves the right to change the circuitry and specifications without notice at any time. the parametric values (min and max limits) shown in the electrical characteristics table are guaranteed. other parametric values quoted in this data sheet are provided for guidance. 14 maxim integrated 160 rio robles, san jose, ca 95134 usa 1-408-601-1000 ? 2010 maxim integrated maxim integrated and the maxim integrated logo are trademarks of maxim integrated products, inc. revision history revision number revision date description pages changed 0 4/10 initial release ? downloaded from: http:///

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