NX4108 -12 NX4108-12 1A SYNCHRONOUS BUCK SWITCHER WITH FET ON BOARD Production Datasheet Pb Free Product DESCRIPTION FEATURES n 2.8 to 5.5V Input Voltage The NX4108-12 is a current mode PWM buck switcher n Fixed 1.2V Output Voltage with internal compensation and fixed 1.2V output volt- n 5-pin SOT23 Package age, can provide up to 1A output current with FET on n 1MHz Fixed Frequency PWM Operation board. It operates from 2.8V to 5.5V which is ideal for n Internally-compensated Current Mode Controller the application with single cell Li-Ion battery as well as n Peak Current Limit with HICCUP Feature and Over other 3.3V input bus supply applications. Switching fre- Temperature Protection quency is fixed 1MHz, small surface mount inductors n Prebias Start-up Operation and capacitors are allowed to use, make it good for por- n Pb-free and RoHS Compliant table applications. NX4108-12 is available in 5-pin SOT23 package. APPLICATIONS n Li-Ion Battery Operated Portable System n Cellular Phones n Portable Applications n USB Devices TYPICAL APPLICATION VIN=5V 22uF(X5R,10V) 1 4 EN VIN 5 2.2uH 3 VOUT Vout=1.2V SW 10uF (X5R, 2 6.3V) GND Figure1 - Typical application of NX4108-12 ORDERING INFORMATION Device Temperature Package Pb-Free o o NX4108-12CZ1TR -40 C to 85 C SOT23-5L Yes Rev. 1.1 Microsemi 1 06/30/10 Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570NX4108-12 ABSOLUTE MAXIMUM RATINGS VIN to GND ..................................................................... -0.3V to 6V SW,VOUT,EN to GND ...................................................... -0.3V to VIN + 0.3V ESD Susceptibility ............................................................. 1kV o Lead Temperature(Soldering,10sec.) .................................... 300 C o o Storage Temperature Range ................................................ -55 C to 150 C o o Operating Junction Temperature Range ................................ -40 C to 150 C CAUTION: Stresses above those listed inABSOLUTE MAXIMUM RATING, 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 o 110/CW JA VOUT EN 1 5 2 GND VIN SW 3 4 ELECTRICAL SPECIFICATIONS o V =3.5V. Typical data refers to T = 25 C. Unless otherwise specified. IN A PARAMETER SYM Test Condition Min TYP MAX Units V Voltage OUT V Voltage V 1.168 1.2 1.232 V OUT OUT Line Regualtion Line Regulation VIN=3V to 5V,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 V 2.8 5.5 IN I EN=GND 1 5.0 uA Shutdown Current shutdown I No Load, switching 15 mA Quiescent Current q Oscillator (Rt) Frequency F kHz 900 1000 1300 S Max Duty Cycle 78 85 % Min ON time 100 nS SS Soft Start time Tss 500 uS Rev. 1.1 Microsemi 2 06/30/10 Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570