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L5970D013TR Datasheet(PDF) 1 Page - STMicroelectronics |
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L5970D013TR Datasheet(HTML) 1 Page - STMicroelectronics |
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1 / 10 page  1/10 L5970D May 2003 s UP TO 1A OUTPUT CURRENT s OPERATING INPUT VOLTAGE FROM 4.4V TO 36V s 3.3V / (±2%) / REFERENCE VOLTAGE s OUTPUT VOLTAGE ADJUSTABLE FROM 1.2V TO 35V s LOW DROPOUT OPERATION: 100% DUTY CYCLE s 250KHz INTERNALLY FIXED FREQUENCY s VOLTAGE FEEDFORWARD s ZERO LOAD CURRENT OPERATION s INTERNAL CURRENT LIMITING s INHIBIT FOR ZERO CURRENT CONSUMPTION s SINCHRONIZATION s PROTECTION AGAINST FEEDBACK DISCONNECTION s THERMAL SHUTDOWN 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 DESCRIPTION The L5970D is a step down monolithic power switching regulator capable to deliver up to 1A at output voltages from 1.2V to 35V. The device uses an internal P-Channel D-MOS transistor (with a typical Rdson of 250m Ω) as switching element to minimize the size of the ex- ternal components. 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 fre- quency modulation offers an effective constant current short circuit protection. SO8 ORDERING NUMBERS: L5970D (SO8) L5970D013TR (T&R) UP TO 1A STEP DOWN SWITCHING REGULATOR TEST APPLICATION CIRCUIT D98IN954C 8 2 4 5 1 7 L5970D C1 10 µF 35V CERAMIC C2 100 µF 10V VOUT=3.3V VIN = 4.4V to 35V R1 5.6K R2 3.3K R3 4.7K C4 22nF C3 220pF 3 6 D1 STPS2L40U 3.3V INH. SYNC. COMP VCC VREF OUT FB GND L1 33 µH |
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