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power conditioning - smt 9 9 - 1 for price, delivery and to place orders: hittite microwave corporation, 2 elizabeth drive, chelmsford, ma 01824 978-250-3343 tel ? 978-250-3373 fax ? order on-line at www.hittite.com application support: apps@hittite.com HMC976LP3E 400ma low noise, high psrr linear voltage regulator v01.0711 general description features functional diagram the HMC976LP3E is a bicmos ultra low noise linear voltage regulator. the high power supply rejection ratio (psrr) in the 0.1 mhz to 10 mhz range provides excellent rejection of any preceding switching regulator or other power supply noise. the voltage output is ideal for frequency generation subsystems including hittites broad line of plls with integrated vcos. the output voltage can be adjusted lower than the default value by using one external resistor. the output can be set to 5v by grounding the hv pin. the regulator can be powered down by the ttl-compatible enable input. the HMC976LP3E is housed in a 3x3mm qfn smt package. high output current: 400ma low dropout: 300mv at 400ma output and vr>3v ultra low noise: 3nv/hz at 10 khz, 6nv/hz at 1 khz high power supply rejection ratio (psrr): <-60 db at 1 khz, <-30 db at 1 mhz adjustable voltage output: vr 1.8 to 5v at 400ma designed to work with low esr ceramic capacitors low power-down current: <1 a thermal protection 16 lead 3x3 mm smt package: 9mm2 typical applications the HMC976LP3E is ideal for: ? test instrumentation ? military radios, radar and ecm ? basestation infrastructure ? ultra low noise frequency generation ? fractional-n synthesizer supply ? microwave vco supply ? mixed-signal circuit supply ? low noise baseband circuit supply table 1. electrical specifcations, t a = +25 c parameter conditions min typ max units output voltage vr (default) vdd = 5.5v; maximum load current 4.7 4.8 4.9 v output voltage vr (5v setting) vdd = 5.5v; maximum load current 4.9 5 5.1 v output voltage tolerance vdd = 5.5v; maximum load current; default and 5v setting 2 % input voltage range (default) default output voltage confguration 5.1 5.5 v input voltage range vr>3v [1] vdd>vr+0.3v 3.3 5.5 v input voltage range vr<3v [1] 3.3 5.5 v [1] see absolute maximum ratings table absolute maximum ratings
power conditioning - smt 9 9 - 2 for price, delivery and to place orders: hittite microwave corporation, 2 elizabeth drive, chelmsford, ma 01824 978-250-3343 tel ? 978-250-3373 fax ? order on-line at www.hittite.com application support: apps@hittite.com HMC976LP3E 400ma low noise, high psrr linear voltage regulator v01.0711 table 1. electrical specifcations (continued) parameter conditions min typ max units output voltage range vr set by external resistors. 1.8 5.1 v reference voltage vref vdd = 5.5v; ref cannot source/sink external current 1.17 v output current vr [1] t a = -40c to +85c 400 ma output noise spectral density 10 hz 100 hz 1 khz 10 khz 100 khz vdd = 5.5v; vr = 5.0v measured on application schematic [3] maximum load current 4000 120 6 3 3 nv/rthz integrated output noise 100 hz to 100 khz vdd = 5.5v; vr = 5.0v [3] 1.5 vrms load regulation, vr vdd = 5.5v; vr=5.0v 0.01 % / ma psrr 1 khz 10 khz 100 khz 1 mhz 10 mhz 50 mhz vdd = 5.5v; vr=5.0v maximum load current -70 -65 -45 -35 -30 -20 db output voltage variation vs. package base temperature 25c to 85c -40c to 25c vdd = 5.5v; vr=5.0v maximum load current 0.005 0.005 0.01 0.01 % / c % / c current consumption (i gnd ) ven = vdd = 5.5v; maximum load current 1.1 1.5 ma power down current vdd = 5.5v; en = low; output is foat - ing (high - impedance) in power-down mode 1 a start-up transient time 0 to 90% of fnal voltage vdd = 5.5v [3] 200 ms enable input en high level vdd>=ven 2 vdd v enable input en low level vdd>=ven 0 0.8 v output load capacitance [2] to guarantee stability, noise and psrr performance [3] 4.7 f thermal protection threshold junction temperature 115 c thermal protection hysteresis 10 c [1] the regulator does not include short-circuit protection circuitry. the outputs will withstand short-circuit conditions for a duration <10s. [2] HMC976LP3E was designed to work with low esr ceramic capacitors connected to pin 4 vrx. [3] s ee HMC976LP3E 5.0v user application schematic herein
power conditioning - smt 9 9 - 3 for price, delivery and to place orders: hittite microwave corporation, 2 elizabeth drive, chelmsford, ma 01824 978-250-3343 tel ? 978-250-3373 fax ? order on-line at www.hittite.com application support: apps@hittite.com HMC976LP3E 400ma low noise, high psrr linear voltage regulator v01.0711 vout=5v output noise spectral density [1] vout and vref vs. temperature [1] vout=3.3v output noise spectral density [2] vout=3.3v psrr vs. vin-vout [2] vout vs. vin vs. temperature [1] vout 4.8v psrr vs. vin-vout [3] 10 -10 10 -9 10 -8 10 -7 10 -6 10 -5 10 1 10 2 10 3 10 4 10 5 10 6 10 7 10 8 noise voltage (v/rthz) frequency (hz) c3=1uf c2=1uf c3=1uf c2=10uf c3=4.7uf c2 =4.7uf 10 -10 10 -9 10 -8 10 -7 10 -6 10 -5 10 1 10 2 10 3 10 4 10 5 10 6 10 7 10 8 noise voltage (v/rthz) frequency (hz) c3=4.7uf c2=4.7uf c3=4.7uf c2=10uf 4.950 4.955 4.960 4.965 4.970 4.975 1.150 1.155 1.160 1.165 1.170 1.175 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 vout (v) vref (v) temperature (c) vref vr 4.40 4.50 4.60 4.70 4.80 4.90 5.00 0 0.1 0.2 0.3 0.4 0.5 0.6 4 4.2 4.4 4.6 4.8 5 5.2 5.4 5.6 25c 85c -40 vin-vout (v) input voltage (v) vout (v) -80 -70 -60 -50 -40 -30 -20 10 2 10 3 10 4 10 5 10 6 10 7 10 8 psrr (db) frequency (hz) vin-vout=0.4v vin-vout=0.6v vin-vout=0.8v -90 -80 -70 -60 -50 -40 -30 -20 10 2 10 3 10 4 10 5 10 6 10 7 10 8 psrr (db) frequency (hz) vin-vout=0.25v vin-vout=0.5v vin-vout=0.8v vin-vout=1.0v vin-vout=1.7v [1] vdd=5.5v,400ma load see HMC976LP3E 5v user application schematic. [2] vdd=5.0v,400ma load see HMC976LP3E 3.3v user application schematic. [3] vdd=5.5v,400ma load see HMC976LP3E 4.8v user application schematic .
power conditioning - smt 9 9 - 4 for price, delivery and to place orders: hittite microwave corporation, 2 elizabeth drive, chelmsford, ma 01824 978-250-3343 tel ? 978-250-3373 fax ? order on-line at www.hittite.com application support: apps@hittite.com HMC976LP3E 400ma low noise, high psrr linear voltage regulator v01.0711 output load switched off to on [1] supply turn-on transient [2] output load switched on to off [1] supply turn-off transient [2] HMC976LP3E output noise spectral density vs. commercial psu [1] 4.88 4.92 4.96 5.00 5.04 5.08 0 100 200 300 400 500 -5 0 5 10 15 20 25 30 35 40 45 output (v) current (ma) time (ms) current vr output 4.88 4.92 4.96 5.00 5.04 5.08 0 100 200 300 400 500 -5 0 5 10 15 20 25 30 35 40 45 output (v) current (ma) time (ms) current vr output 0.00 0.500 1.00 1.50 2.00 2.50 3.00 3.50 4.00 0.00 0.500 1.00 1.50 2.00 2.50 3.00 3.50 4.00 -50 0 50 100 150 200 250 300 350 400 450 output (v) ena (v) time (ms) vr output ena 0.00 0.500 1.00 1.50 2.00 2.50 3.00 3.50 4.00 0.00 0.500 1.00 1.50 2.00 2.50 3.00 3.50 4.00 -0.200 0.00 0.200 0.400 0.600 0.800 output (v) ena (v) time (s) vr output ena 10 -10 10 -9 10 -8 10 -7 10 -6 10 -5 10 1 10 2 10 3 10 4 10 5 10 6 10 7 10 8 noise voltage (v/rthz) frequency (hz) commercial psu output input to regulator HMC976LP3E output 4.950 4.970 4.990 5.010 5.030 5.050 0 50 100 150 200 250 300 350 400 vout (v) load current ma vout vs. load current [1] [1] vdd=5.5v, 400ma load HMC976LP3E 5v user application schematic. [2] vdd=5.0v, 400ma load HMC976LP3E 3.3v user application schematic
power conditioning - smt 9 9 - 5 for price, delivery and to place orders: hittite microwave corporation, 2 elizabeth drive, chelmsford, ma 01824 978-250-3343 tel ? 978-250-3373 fax ? order on-line at www.hittite.com application support: apps@hittite.com HMC976LP3E 400ma low noise, high psrr linear voltage regulator v01.0711 outline drawing part number package body material lead finish msl rating package marking [1] HMC976LP3E rohs-compliant low stress injection molded plastic 100% matte sn msl1 [2] 976 xxx x [1] 4-digit lot number xxxx [2] max peak refow temperature of 260 c table 2. absolute maximum ratings electrostatic sensitive device observe handling precautions table 3. package information vdd to gnd voltage +5.8v / -0.3v en to gnd voltage +5.8v /-0.3v rdx / hvx to gnd voltage +5.8v / -0.3v maximum dissipation 780mw thermal resistance (junction to ambient) 51.5 c/w maximum junction temperature +125 c max output current 420 ma storage temperature -65 to +150 c operating temperature -40 to +85 c esd sensitivity (hbm) class 1c stresses above those listed under absolute maximum ratings may cause permanent damage to the device. this is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specifcation is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. the absolute maximum ratings apply individually only, not in combination. notes: [1] package body material: low stress injection molded plastic silica and silicon impregnated. [2] lead and ground paddle material: copper alloy. [3] lead and ground paddle plating: 100% matte tin. [4] dimensions are in inches [millimeters]. [5] lead spacing tolerance is non-cumulative. [6] pad burr length shall be 0.15mm max. pad burr height shall be 0.25m max. [7] package warp shall not exceed 0.05mm [8] all ground leads and ground paddle must be soldered to pcb ground. [9] refer to hittite application note for suggested pcb land pattern.
power conditioning - smt 9 9 - 6 for price, delivery and to place orders: hittite microwave corporation, 2 elizabeth drive, chelmsford, ma 01824 978-250-3343 tel ? 978-250-3373 fax ? order on-line at www.hittite.com application support: apps@hittite.com HMC976LP3E 400ma low noise, high psrr linear voltage regulator v01.0711 pin number function description interface schematic 1 en enable input, ttl logic level. the vr and vrx outputs are foating (high impedance) when en = low. 2 rd resistive feedback for vr, see output voltage adjust section. 3 ref reference voltage (bandgap) output. cannot be used to source/sink current to/from external circuits 4 vrx for decoupling capacitor cannot be used to source current to external circuits 11 vr regulator output vr 400ma 5 hv sets vr to 5v output when grounded 6 - 10, 12 - 14,16 n/c these pins can be left unconnected or connected to gnd with no change in performance 15 vdd unregulated power supply input 5.5v max package base gnd must contact pcb ground table 4. pin descriptions
power conditioning - smt 9 9 - 7 for price, delivery and to place orders: hittite microwave corporation, 2 elizabeth drive, chelmsford, ma 01824 978-250-3343 tel ? 978-250-3373 fax ? order on-line at www.hittite.com application support: apps@hittite.com HMC976LP3E 400ma low noise, high psrr linear voltage regulator v01.0711 evaluation pcb item contents part number evaluation pcb hm976lp3e evaluation pcb 131671-HMC976LP3E table 5. ordering information item contents j1 pcb mount sma connector j3 3 pin header jp4, jp6, jp7, jp8, 2 pin header and jumper c10, c12, c21 4.7f capacitor 0603 pkg. c11 0.1f capacitor 0402 pkg. r13 0.2 ohm resistor 0402 pkg. r3 1 ohm resistor 0402 pkg. r8 100 kohm resistor 0402 pkg. tp1, tp3 test point pc compact red tp2 test point pc compact black u1 HMC976LP3E 400ma low noise, high psrr linear voltage regulator pcb 131669 eval board table 6. list of materials for evaluation pcb 131671
power conditioning - smt 9 9 - 8 for price, delivery and to place orders: hittite microwave corporation, 2 elizabeth drive, chelmsford, ma 01824 978-250-3343 tel ? 978-250-3373 fax ? order on-line at www.hittite.com application support: apps@hittite.com HMC976LP3E 400ma low noise, high psrr linear voltage regulator v01.0711 evaluation pcb schematic operational features the recommended confguration is HMC976LP3E 4.8v user application schematic . this is for the default output voltage of 4.8v nominal. the values shown are those recommended for optimum noise spectral density. for users requiring extremely low noise in the 1 mhz to 10 mhz range the largest capacitor possible should be used: a 68uf takes the noise between 100 khz and 1 mhz to below 2.5nv/hz. load capacitor characteristics the HMC976LP3E was designed to work with a low esr ceramic load capacitor on the vrx pin (c21 in the schematic above). low esr ceramic capacitors are very small and best for eliminating high frequency noise. ceramic capacitors can vary as much as 50% versus temperature and 60% versus voltage, dependant on the ceramic type e.g. z5u, y5v, x7r or x5r. there are no restrictions on ceramic type or minimum esr, only that the user must guarantee that the minimum capacitance over operating conditions is 4.7f, smaller values can result in noise peaking or lower stability.
power conditioning - smt 9 9 - 9 for price, delivery and to place orders: hittite microwave corporation, 2 elizabeth drive, chelmsford, ma 01824 978-250-3343 tel ? 978-250-3373 fax ? order on-line at www.hittite.com application support: apps@hittite.com HMC976LP3E 400ma low noise, high psrr linear voltage regulator v01.0711 output voltage adjustment the default output voltage is 4.8v this confguration HMC976LP3E 4.8v user application schematic . the output voltage can be set to 5v by a ground on hv pin 5 HMC976LP3E 5v user application schematic. the output voltage can be set from 1.8v to <4.8v by a resistor from pin 2 to the output pin 11 shown in HMC976LP3E 3.3v user application schematic. the value of the resistor is given by the equation below. if the temperature stability performance similar to that shown in the plot vout and vref vs. temperature [1] is required, then any external resistor temperature coefficient is a critical parameter and should be better than 50ppm and 1% tolerance. please note that the temperature coefficient of the internal resistor feedback divider is 270ppm/c. layout of pcb the layout of the pcb should follow these guide lines, the paddle should be grounded to the supply -ve terminal or ground with at least 5 vias directly under the paddle to the bottom side ground plane. to ensure the noise and psrr specifcations are met, the capacitors connecting to pins 15, 11, 3 (see user application schematics), should be placed as close as possible to the relevant pin and the ground connection should be as short as possible. trace widths and via sizes should be scaled to match the current drawn. the use of a large ground plane is recommended with a large number of ground vias near the device to carry the ground. thermal protection under the HMC976LP3E default output voltage condition (vout = 4.8v and maximum output current) the thermal protection circuitry limits the output current to approximately 500a. when the ambient temperature rises to approximately +115c. the output will be kept disabled, allowing to the regu - lator to cool down, until the ambient temperature decreases by approximately 10c. the thermal pro - tection may cycle the output on and off, protecting the regulator from damage, dependant on the power dissipation and ambient temperature. the thermal protection circuitry will act indirectly when a short circuit occurs at the output. after the overload or the fault condition is removed/changed, the regulator output will return to the nominal operation. for reliable operation the absolute maximum ratings must be complied with especially the maximum junction temperature must not be exceeded. the board copper ground area and thermal dissipation should be taken into account during board layout. the junction temperature for a given dissipation can be calculated from the equation below t t p j a d j a = + ? ? ? ? ? ? ? ? ? ? ? ? ? ? where tj=junction temperature (c), ta=ambient temperature (c), pd=dissipated power (w), ja=thermal resistivity junction to ambient (c/w). ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? = 1 17 . 1 * 32 . 0 1 9 . 18 * 1 17 . 1 1 vout vout r
power conditioning - smt 9 9 - 10 for price, delivery and to place orders: hittite microwave corporation, 2 elizabeth drive, chelmsford, ma 01824 978-250-3343 tel ? 978-250-3373 fax ? order on-line at www.hittite.com application support: apps@hittite.com HMC976LP3E 400ma low noise, high psrr linear voltage regulator v01.0711 thermal dissipation should be taken into account at all times especially with large vdd-vr values i.e. if 1.8v is required from 5.5v vin then the output current must be restricted to <210ma , or vdd restricted to <3.75v for a 400ma load. the following plots show the board ground copper area infuence, on junction temperature for ambient temperatures of 25c, 50c, 85c vs. total power dissipated in the device. the conditions for the plots are : 1. 100mm 2 copper area 2. 1000mm 2 copper area 3. 2580mm 2 copper area HMC976LP3E evaluation pcb no heat sink 4. 2580mm 2 copper area HMC976LP3E evaluation pcb with heat sink 5. jedec board as per jesd51-3 HMC976LP3E junction temperature c vs. total power dissipation 25c ambient 25 50 75 100 125 150 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 junction temperature tj (c) power dissipation (w) tjmax 1000mm 2 no hs 2580mm 2 no hs 2580mm 2 with hs 100 mm 2 no hs jedec no hs 25 50 75 100 125 150 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 junction temperature tj (c) power dissipation (w) tjmax jedec no hs 2580mm 2 with hs 2580mm 2 no hs 1000mm 2 no hs 100mm 2 no hs 25 50 75 100 125 150 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 junction temperature tj (c) power dissipation (w) 100mm 2 no hs 2580mm 2 with hs 2580mm 2 no hs 1000mm 2 no hs tjmax jedec no hs HMC976LP3E junction temperature c vs. total power dissipation 50c ambient HMC976LP3E junction temperature c vs. total power dissipation 85c ambient
power conditioning - smt 9 9 - 11 for price, delivery and to place orders: hittite microwave corporation, 2 elizabeth drive, chelmsford, ma 01824 978-250-3343 tel ? 978-250-3373 fax ? order on-line at www.hittite.com application support: apps@hittite.com HMC976LP3E 400ma low noise, high psrr linear voltage regulator v01.0711 HMC976LP3E 3.3v user application schematic
power conditioning - smt 9 9 - 12 for price, delivery and to place orders: hittite microwave corporation, 2 elizabeth drive, chelmsford, ma 01824 978-250-3343 tel ? 978-250-3373 fax ? order on-line at www.hittite.com application support: apps@hittite.com HMC976LP3E 400ma low noise, high psrr linear voltage regulator v01.0711 HMC976LP3E 4.8v user application schematic HMC976LP3E 5v user application schematic

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