DESCRIPTION
An internal oscillator fixes the switching frequency at 250KHz. Having a minimum input voltage of 4.4V only, it is particularly suitable for 5V bus, available in all computer related applications. Pulse by pulse current limit with the internal frequency modulation offers an effective constant current short circuit protection. APPLICATIONS
: s CONSUMER: STB, DVD, TV, VCR,CAR RADIO, LCD MONITORS s NETWORKING: XDSL, MODEMS,DC-DC MODULES s COMPUTER: PRINTERS, AUDIO/GRAPHIC CARDS, OPTICAL STORAGE, HARD DISK DRIVE s INDUSTRIAL: CHARGERS, CAR BATTERY DC-DC CONVERTERS TEST APPLICATION CIRCUIT 3.3V VIN = 4.4V to 35V VREF VCC SYNC. 6 8 2 4 INH. 1 OUT L1 33µH D1 STPS2L40U VOUT=3.3V L5970D 3 7 5 GND FB R1 5.6K C1 10µF 35V CERAMIC COMP C4 22nF C3 220pF C2 100µF 10V R3 4.7K R2 3.3K D98IN954C May 2003 1/10 L5970D PINS CONNECTION (Top View) OUT SYNC INH COMP 1 2 3 4 D98IN955 8 7 6 5 VCC GND VREF FB PINS FUNCTION N. 1 2 3 4 5 6 7 8 Name OUT SYNC INH COMP FB VREF GND VCC Regulator Output. Master/slave synchronization.
STMicroelectronics
