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microsemi analog mixed signal group nx4110 1 rev. 2.0 12/30/09 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 typical application description the nx4110 is a current mode pwm buck switcher with internal compensation, can provide up to 1a output cur- rent with fet on board. it operates from 2.8v to 5.5v and output as low as 0.6v which is ideal for the applica- tion with single cell li-ion battery as well as other 3.3v input bus supply applications. switching frequency is fixed 1mhz, small surface mount inductors and capaci- tors are allowed to use, make it good for portable appli- cations. nx4110 is available in 5-pin sot23 package. n sot23-5l package n internal digital soft start n internally-compensated current mode controller n peak current limit with hiccup feature and over temperature protection n prebias start-up operation n pgood available n pb-free and rohs compliant ordering information features 1a synchronous buck switcher with fet on board applications n li-ion battery operated portable system n cellular phones n portable applications n usb devices production data sheet device temperature package pb-free NX4110CZ1TR -40 o c to 85 o c sot23-5l yes fig.1 - typical application of NX4110CZ1TR pb free product 22uf(x5r,6.3v) 2.2uh vin=5v vout=2.5v vin sw gnd fb pgood nx4110 5 1 4 3 2 (x5r, 6.3v) 10uf 332k 105k
microsemi analog mixed signal group nx4110 2 rev. 2.0 12/30/09 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 absolute maximum ratings vin to gnd ..................................................................... -0.3v to 6v sw,fb,pgood to gnd .................................................. -0.3v to vin + 0.3v esd susceptibility ............................................................. 1kv lead temperature(soldering,10sec.) .................................... 300 o c storage temperature range ................................................ -55 o c to 150 o c operating junction temperature range ................................ -40 o c to 150 o c caution: stresses above those listed in "absolute maximum ratings", may cause permanent damage to the device. this is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. package information 5-lead plastic sot23 electrical specifications v in =3.5v. typical data refers to t a = 25 o c. unless otherwise specified. 3 2 1 4 5 sw pgood gnd fb vin o ja cw q?110/ parameter sym test condition min typ max units reference voltage ref voltage v fb 0.59 0.6 0.607 v line regualtion line regulation vin=3v to 5v,vout=1.8v, iout=10ma 2 mv vin uvlo vin rising threshold 2.3 2.5 2.8 v vin falling threshold 2.3 v supply voltage(vin) vin input voltage range v in 2.8 5.5 v quiescent current i q no load, switching 4 ma oscillator (rt) frequency f s 800 1000 1200 khz max duty cycle 78 86 % min on time 100 ns error amplifiers feedback input bias current 0.05 ua ss soft start time tss 500 us
microsemi analog mixed signal group nx4110 3 rev. 2.0 12/30/09 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 sw gnd fb vin pgood pin descriptions pin symbol pin description sw output. junction of the internal high-side and low-side power mosfets, and output inductor. ground connection for chip. connect gnd with large copper areas to the input and output supply returns, and negative terminals of the input and output capacitors. error amplifier inverting input. error amplifier inverting input. this pin is connected via resistor dividers to the output of the switching regulators to set the output dc voltage. a 332kohm resistor is recommended to be connected from vout and fb . supply voltage input for switcher. this pin needs minimum 22uf/x5r/6.3v as input capacitor. pgood indicator. it requires a pull up resistor to vcc or lower voltage. when fb pin reaches 90% of the reference voltage pgood transitions from lo to hi state. parameter sym test condition min typ max units current limit current limit threshold 1.8 a thermal shutdown thermal shutdown trip point 155 o c hysteresis 15 o c internal switch vin=5v 400 vin=3.3v 480 vin=5v 300 vin=3.3v 360 pgood pgood low threshold voltage 85 %v ref pgood high threshold voltage 90 %v ref rdson of synchronous fet mohm mohm rdson of control fet
microsemi analog mixed signal group nx4110 4 rev. 2.0 12/30/09 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 block diagram fig. 2 - simplified block diagram of the nx4110 one shot por fb gnd sw vin soft start vref uvlo por control logic hiccup timer bias generator vref por thermal shutdown clk pwm comparator osc vin pwm ocpb ocpb start + - + r s q 3 cycle counter vin pgood 0.9*vref ss_finished fb
microsemi analog mixed signal group nx4110 5 rev. 2.0 12/30/09 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 reference voltage vs temperature 0.593 0.594 0.595 0.596 0.597 0.598 0.599 0.6 0.601 0.602 0.603 0.604 0 20 40 60 80 100 120 140 160 temperature(c) reference voltage(v) typical operating characteristics fig.3 - reference volateg vs temperature fig.4 - normalized frequency vs temperature normalized frequency vs temperature 0.9 0.92 0.94 0.96 0.98 1 0 20 40 60 80 100 120 140 160 temperature(c) normalized frequency
microsemi analog mixed signal group nx4110 6 rev. 2.0 12/30/09 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 duty cycle vs maximum output current 0 200 400 600 800 1000 1200 0 20 40 60 80 duty cycle (%) output current (ma) fig.5 - duty cycle vs maximum output current
microsemi analog mixed signal group nx4110 7 rev. 2.0 12/30/09 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 fig. 6 - demo board schematic typical application( vout=2.5v) fig. 8 - transient response fig. 7 - output ripple 22uf(x5r,6.3v) 2.2uh vin=5v vout=2.5v vin sw gnd fb pgood nx4110 5 1 4 3 2 (x5r, 6.3v) 10uf 332k 105k
microsemi analog mixed signal group nx4110 8 rev. 2.0 12/30/09 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 fig. 9 - demo board schematic typical application( vout=1.8v) fig. 11 - transient response fig. 10 - output ripple fig. 12 - efficiency 22uf(x5r,6.3v) 2.2uh vin=5v vout=1.8v vin sw gnd fb pgood nx4110 5 1 4 3 2 (x5r, 6.3v) 10uf 332k 165k
microsemi analog mixed signal group nx4110 9 rev. 2.0 12/30/09 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 fig. 13 - demo board schematic typical application( vout=1.2v) fig. 15 - transient response fig. 14 - output ripple fig. 16 - startup 22uf(x5r,6.3v) 2.2uh vin=5v vout=1.2v vin sw gnd fb pgood nx4110 5 1 4 3 2 (x5r, 6.3v) 10uf 332k 332k fig. 17 - shutdown
microsemi analog mixed signal group nx4110 10 rev. 2.0 12/30/09 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 typical application( vout=1.2v) fig. 18 - efficiency
microsemi analog mixed signal group nx4110 11 rev. 2.0 12/30/09 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 demoboard layout fig. 19 - demoboard schematic fig. 20- top layer
microsemi analog mixed signal group nx4110 12 rev. 2.0 12/30/09 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 fig. 21 - gound layer fig. 22 - power layer
microsemi analog mixed signal group nx4110 13 rev. 2.0 12/30/09 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 fig. 23 - bottom layer
microsemi analog mixed signal group nx4110 14 rev. 2.0 12/30/09 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 sot23 5 pin package outline dimensions top view side view

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