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mp1400 7v input, 0.6a peak, 1.5mhz negative dcdc power converter in 8-ball csp package mp1400 rev.1.1 www.monolithicpower.com 1 5/27/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. the future of analog ic technology description the mp1400 is a monolithic negative dcdc power converter with built-in internal power mosfet. the dc-dc ic has a tiny surface mount 0.8mm x 1.6mm 8-ball csp package. it achieves up to 600ma peak output current from a 2.7v to 7v input voltage. the output voltage can be regulated from -0.9v to -6v. the 1500 khz switching frequency allows for smaller external components producing a compact solution for a wide range of load currents. the internal compensation and soft start minimizes the external component count and limits the inrush current during startup. fault condition protection includes cycle-by- cycle current limiting and thermal shutdown. features ? wide 2.7v to 7v operating input range output adjustable from -0.9v to -6v ? up to 600ma peak output current ? 300m ? high side mosfet on resistance ? default 1.5mhz switching frequency ? ground reference enable ? cycle-by-cycle over current protection ? short circuit protect with hiccup mode ? output voltage discharge ? output over voltage protection ? available in a 0.8mm x 1.6mm 8-ball csp package applications ? general negative voltage ? hdd ? small oled panel all mps parts are lead-free, halogen free, and adhere to the rohs directive. for mps green status, please visit mps website under qualit y assurance. ?mps? and ?the future of analog ic technology? are registered trademarks of monolithic power systems, inc. typical application mp1400 105k 24.9k 4.7uh en ref vout 10uf en in sw gnd fb vout vin gnd d1 16v mbr230 r3 100k c1 a r1 r2 22uf 16v c2a l1 gnd gnd gnd gnd
mp1400 ? negative dcdc power converter mp1400 rev.1.1 www.monolithicpower.com 2 5/27/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. ordering information part number* package top marking MP1400GC csp 0.8mm x 1.6mm bt * for tape & reel, add suffix ?z (e.g. MP1400GC?z); package reference a b c d 12 ref fb en vout gnd gnd sw in csp (0.8mm x 1.6mm) absolute maxi mum ratings (1) supply voltage v in ...................................... 7.5v v sw ...................................................................... v out -0.7v (-8v for <10ns) to 8v (9v for <10ns) output voltage v out ................................... -6.5v all other pins ................................-0.3v to 6.5 v junction temperature ...............................150 ? c lead temperature ....................................260 ? c continuous power dissipation (t a = +25c) (2) ???.?.. ............................................... 0.75w storage temperature............... -65 ? c to +150 ? c recommended operating conditions (3) supply voltage v in .............................2.7v to 7v output voltage v out ........................ -0.9v to -6v operating junction temp. (t j ). -40c to +125c thermal resistance (4) ja jc csp8 ??????????? 170 ?..na?c/w notes: 1) exceeding these ratings may damage the device. 2) the maximum allowable power dissipation is a function of the maximum junction temperature t j (max), the junction-to- ambient thermal resistance ja , and the ambient temperature t a . the maximum allowable continuous power dissipation at any ambient temperature is calculated by p d (max) = (t j (max)-t a )/ ja . exceeding the maximum allowable powe r dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown. internal thermal shutdown circuitry protects the device from permanent damage. 3) the device is not guaranteed to function outside of its operating conditions. 4) measured on jesd51-7, 4-layer pcb.
mp1400 ? negative dcdc power converter mp1400 rev.1.1 www.monolithicpower.com 3 5/27/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. electrical characteristics v in = 3.7v, t a = +25 ? c, unless otherwise noted. parameter symbol condition min typ max units reference voltage v ref 2.7v v in 7v 1.178 1.190 1.202 v feedback current i fb v fb = 0v 10 50 na fb voltage v fb 0 20 mv pfet switch on resistance (5) r dson_p v in =5v 300 m ? switch leakage v en = 0v, v in = 6v v sw = 0v 0 0.1 a pfet current limit 1 1.6 a maximum duty cycle d max 70 85 % minimum on time (5) 100 ns switching frequency f s 1200 1500 1800 khz soft-start time t ss-on no load 0.5 ms output voltage discharge current i dis en=0v,vout=-1v 25 ma under voltage lockout threshold rising 2.35 2.45 2.55 v under voltage lockout threshold hysteresis 200 mv en input logic low voltage 0.4 v en input logic high voltage 1.2 v en hysteresis 100 mv v en =2v 1.7 ua en input current v en =0v 0 na supply current (shutdown) v en =0v 0 0.2 a supply current (quiescent) v en =2v, v fb =-0.1v, ref pin float, no switching 200 250 a over voltage threshold -6.5 v over voltage threshold hysteresis 300 mv thermal shutdown 160 ? c thermal hysteresis (6) 15 ? c notes: 5) guaranteed by characterization test 6) guaranteed by design
mp1400 ? negative dcdc power converter mp1400 rev.1.1 www.monolithicpower.com 4 5/27/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. typical performanc e characteristics v in = 5v, v out = -5v, l =4.7h, c out =3 x 22 f, t a = +25oc, unless otherwise noted.
mp1400 ? negative dcdc power converter mp1400 rev.1.1 www.monolithicpower.com 5 5/27/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. typical performanc e characteristics (continued) v in = 5v, v out = -5v, l =4.7h, c out =3 x 22 f, t a = +25oc, unless otherwise noted.
mp1400 ? negative dcdc power converter mp1400 rev.1.1 www.monolithicpower.com 6 5/27/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. typical performanc e characteristics performance waveforms are tested on the evaluation board of the design example section. v in = 5v, v out = -5v, l =4.7h, c out =3 x 22 f, t a = +25oc, unless otherwise noted. v out 5v/div. v in 5v/div. v sw 5v/div. i inductor 2a/div. v out 5v/div. v in 5v/div. v sw 5v/div. i inductor 2a/div. v out 5v/div. v en 2v/div. v sw 5v/div. i inductor 2a/div. v out 5v/div. v en 2v/div. v sw 5v/div. i inductor 2a/div. v out 5v/div. v en 2v/div. v sw 5v/div. i inductor 2a/div. v out /ac 10mv/div. v sw 5v/div. i inductor 200ma/div. v out 5v/div. v en 2v/div. v sw 5v/div. i inductor 200ma/div. v out 5v/div. v in 5v/div. v sw 5v/div. i inductor 2a/div. v out 5v/div. v in 5v/div. v sw 5v/div. i inductor 2a/div.
mp1400 ? negative dcdc power converter mp1400 rev.1.1 www.monolithicpower.com 7 5/27/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. typical performanc e characteristics (continued) performance waveforms are tested on the evaluation board of the design example section. v in = 5v, v out = -5v, l =4.7h, c out =3 x 22 f, t a = +25oc, unless otherwise noted.
mp1400 ? negative dcdc power converter mp1400 rev.1.1 www.monolithicpower.com 8 5/27/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. pin functions pin # name description a1 ref internal 1.19v reference voltage. a2 fb feedback pin. an external resistor divider fr om the output to gnd, tapped to the fb pin, sets the output voltage. b1 en on/off control. b2 vout output voltage power rail and input sense pin for output voltage. connect load to this pin. output capacitor is needed to decrease the output voltage ripple. c1, c2 gnd analog ground pin. d1 sw output switching node. sw is the drain of the internal high-side p-channel mosfet. connect the inductor to sw to complete the converter. d2 in supply voltage. the mp1400 operates from a +2.7v to +7v unregulated input. decouple capacitor is needed to prevent large voltage spikes from appearing at the input.
mp1400 ? negative dcdc power converter mp1400 rev.1.1 www.monolithicpower.com 9 5/27/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. functional block diagram slope comp comp sw fb 1. 19v uvlo in gnd main switch pch control logic pwm internal ss 1.5mhz oscillator en ref vout output discharge over voltage protection s ea current sense current limit comp rsen uvlo & bandgap figure 1: functional block diagram
mp1400 ? negative dcdc power converter mp1400 rev.1.1 www.monolithicpower.com 10 5/27/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. operation the mp1400 is a monolithic negative dcdc power converter with built-in internal power mosfet. the dc-dc ic has a tiny surface mount 0.8mm x 1.6mm 8-ball csp package and is optimized for low voltage powered applications where small size are critical. it achieves up to 600ma peak output current from a 2.7v to 7v input voltage. the output voltage can be regulated from -0.9v to -6v. the built-in 300m ? pfet can provide high efficiency and eliminates an external boost capacitor. the duty cycle d of negative converter is defined as: out on osc in out v d t f 100% 100% vv ? ??? ? ? ? where t on is the main switch on time, f osc is the oscillator frequency (1.5mhz), v out is the output voltage and v in is the input voltage. current mode pwm control slope compensated current mode pwm control provides stable switching and cycle-by-cycle current limit for superior load and line response and protection of the internal main switch and rectifier diode. the mp1400 switches at a constant frequency (1.5mhz) and regulates the output voltage. during each cycle the pwm comparator modulates the power transferred to the load by changing the inductor peak current based on the feedback error voltage. during normal operation, the main switch is turned on for a certain time to ramp the inductor current at each rising edge of the internal oscillator, and switched off when the peak inductor current is above the error voltage. when the main switch is off, the rectifier diode will supply the current on immediately. light load operation in light load condition, the load requires less energy so the charged current to inductor is smaller than heavy load. the rectifier diode discharges the inductor current. if the inductor current hit the zero, mp1400 will works in discontinuous conduction mode (dcm) operation. startup and shutdown when input voltage is greater than the under- voltage lockout threshold (uvlo), typically 2.5v, mp1400 can be enabled by pulling en pin to higher than 1.2v. leaving en pin float or pull down to ground will disable mp1400. there is an internal 1meg ohm resistor from en pin to ground. when the device is disabled, the part goes into output discharge mode automatically and its internal discharge mosfet provides a resistive discharge path for the output capacitor. for the load capability is depending on the input voltage to output voltage ratio. it?s strongly recommending to power on vin quick enough when load is high. soft start mp1400 has built-in soft start that ramps up the output voltage in a controlled slew rate. during power up, internal soft-start circuitry will limit the amount of in-rush current that drawn from the power supply. the soft start time is about 0.5ms typical. current limit mp1400 has a typical 1.6a current limit for the main pfet switch. when the pfet hits current limit, mp1400 will touch the hiccup threshold until the current lower down. this will prevent inductor current from continuing to build up which will result in damage of the components. output over voltage protection mp1400 has a built-in output voltage protection block. if the output voltage is lower than -6.5v, the pfet will be turned off immediately. after the output voltage status is removed, the part will re- switches automatically.
mp1400 ? negative dcdc power converter mp1400 rev.1.1 www.monolithicpower.com 11 5/27/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. short circuit protection mp1400 enters short circuit protection mode when the current limit is hit, and tries to recover from short circuit with hiccup mode. in short circuit protection, mp1400 will disable output power stage, discharge soft-start cap and then automatically try to soft-start again. if the short circuit condition still holds after soft-start ends, mp1400 repeats this operation cycle till short circuit disappears and output rises back to regulation level.
mp1400 ? negative dcdc power converter mp1400 rev.1.1 www.monolithicpower.com 12 5/27/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. application information component selection setting the output voltage the external resistor divider is used to set the output voltage (see typical application on page 1). the voltage on r1 is 1.19v. there is a ref current on r1 which is decided by r1?s resistance. the recommended ref current should be 10 a and r1 resistance should be 120k. don?t set the ref current larger than 70 a. r2 is then given by: out 21 v rr 1.19 ? ?? the feedback circuit is shown as figure 2. vout fb ref vout mp1400 r2 r1 figure 2: feedback network table 1 lists the recommended resistors value for common output voltages. table 1?resistor selection for common output voltages v out (v) r1 (k ? ) r2 (k ? ) -1.8 24.9(1%) 37.4(1%) -2.5 24.9(1%) 52.3(1%) -3.3 24.9(1%) 69.8(1%) -5 24.9(1%) 105(1%) selecting the inductor a 1h to 10h inductor is recommended for most applications. for highest efficiency, the inductor dc resistance should be small enough. for most designs, the inductance value can be derived from the following equation. ?? in out 1 loutinosc vv l iv v f ? ? ?? ? ? where i l is the inductor ripple current. f osc is switching frequency. choose inductor ripple current to be approximately 30% to 80% of the inductor current. the inductor current is: in out lout in vv ii v ? ? ? then the peak inductor current at ccm is: peak l l 1 ii i 2 ? ??? high-frequency ferrite-core inductor materials reduce frequency-dependent power losses and improve efficiency compared to cheaper powdered-iron cores. the inductor should have low dcr (inductor series resistance without saturated windings) to reduce the resistive power loss; further reducing the dcr will significantly improve efficiency when dcr< mp1400 ? negative dcdc power converter mp1400 rev.1.1 www.monolithicpower.com 13 5/27/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. additional output capacitance may also be required to reduce ripple in dcm mode and to ensure stability in pwm mode, especially at higher output load current. power dissipation ic power dissipation plays an important role in circuit design?not only because of efficiency concerns, but also because of the chip?s thermal requirements. several parameters influence power dissipation, such as: conduction loss (cond) dead time (dt) switching loss (sw) mosfet driver current (dr) supply current (s) based on these parameters, we can estimate the power loss to equal: loss cond dt sw dr s pppppp ????? pcb layout layout is important, especially for switching power supplies with high switching frequencies; poor layout results in reduced performance, emi problems, resistive loss, and even system instability. following the rules below can help ensure a stable layout design: 1. connect the gnd pin to the large ground plane by point connect mode. 2. put the input capacitor as close as possible to the vin pin while keep the gnd end of the output capacitor close to the gnd end of the input capacitor. 3. put the cathode of the schottky close to the sw pin and the anode of the schottky close to the output capacitor to minimize parasitic inductance. 4. route sw away from sensitive analog areas such as fb. it?s not recommended to route sw trace under chip?s bottom side. notes: 7) the recommended layout is based on the figure 3 typical application circuit on the next page. vin r1 gnd sw l1 gnd c2a r2 u1 r4 r3 c2b c2c d1 c1a c1b vout vout vin design example below is a design example following the application guidelines for the specifications: table 2: design example v in 5v v out -5v io 0.6a the detailed application schematic is shown in figure 3. the typical performance and circuit waveforms have been shown in the typical performance characteristics section. for more device applications, please refer to the related evaluation board datasheets.
mp1400 ? negative dcdc power converter mp1400 rev.1.1 www.monolithicpower.com 14 5/27/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. typical application circuits mp1400 105k 24.9k 4.7uh en ref vout 10uf en in sw gnd fb vout vin gnd d1 16v mbr230 r3 100k c1 a r1 r2 22uf 16v c2a l1 gnd gnd gnd 22uf 16v c2b 22uf 16v c2c 10 r4 c1b ns figure 3: 5v in , -5v/0.6a output
mp1400 ? negative dcdc power converter notice: the information in this document is subject to change wi thout notice. please contact m ps for current specifications. users should warrant and guarantee that third party intellectual property rights ar e not infringed upon when integrating mps products into any application. mps will not assume any legal responsibility for any said applications. mp1400 rev.1.1 www.monolithicpower.com 15 5/27/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. package information csp (0.8mm x 1.6mm) side view bottom view note: 1) all dimensions are in millimeters. 2) ball coplanarity shall be 0.05 millimeter max. 3) jedec reference is mo-211, variation bc. 4) drawing is not to scale. pin 1 id marking top view pin 1 id index area recommended land pattern pin 1 id

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