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L4973V5.1

STMicroelectronics
Part Number L4973V5.1
Manufacturer STMicroelectronics
Description 3.5A STEP DOWN SWITCHING REGULATOR
Published Mar 22, 2005
Detailed Description ® L4973V3.3 - L4973V5.1 L4973D3.3 - L4973D5.1 3.5A STEP DOWN SWITCHING REGULATOR UPTO 3.5ASTEP DOWNCONVERTER OPERATING...
Datasheet PDF File L4973V5.1 PDF File

L4973V5.1
L4973V5.1

Overview
® L4973V3.
3 - L4973V5.
1 L4973D3.
3 - L4973D5.
1 3.
5A STEP DOWN SWITCHING REGULATOR UPTO 3.
5ASTEP DOWNCONVERTER OPERATING INPUT VOLTAGE FROM 8V TO 55V 3.
3V AND 5.
1V (±1%) FIXED OUTPUT, AND ADJUSTABLE OUTPUTS FROM: 0V TO 50V (3.
3V type) 5.
1V TO 50V (5.
1 type) FREQUENCY ADJUSTABLE UP TO 300KHz VOLTAGE FEED FORWARD ZERO LOAD CURRENT OPERATION (min 1mA) INTERNAL CURRENT LIMITING (PULSE BY PULSE AND HICCUP MODE) PRECISE 5.
1V (1.
5%) REFERENCE VOLTAGE EXTERNALLY AVAILABLE INPUT/OUTPUT SYNCHRONIZATION FUNCTION INHIBIT FOR ZERO CURRENT CONSUMPTION (100µA Typ.
at VCC = 24V) PROTECTION AGAINST FEEDBACK DISCONNECTION THERMAL SHUTDOWN OUTPUT OVERVOLTAGE PROTECTION SOFT START FUNCTION TYPICAL APPLICATION CIRCUIT (POWERDIP) MULTIPOWER BCD TECHNOLOGY POWERDIP (12+3+3) SO20(12+4+4) ORDERING NUMBERS: L4973V3.
3 (Powerdip) L4973D3.
3 (SO20) L4973V5.
1 (Powerdip) L4973D5.
1 (SO20) DESCRIPTION The L4973 is a step down monolithic power switching regulator delivering 3.
5A at fixed voltages of 3.
3V or 5.
1V and using a simple external divider output adjustable voltage up to 50V.
Realized in BCD mixed technology, the device VCC (8V to 55V) ROSC CIN C2 7 8 10 12 CBOOT VO(3.
3V or 5.
1V) L1 1 4,5,6, 13,14,15 16 L4973 17 9 3 11 2 RCOMP COSC CSS CCOMP D1 COUT D97IN554A April 2000 1/16 L4973V3.
3 - L4973V5.
1 - L4973D3.
3 - L4973D5.
1 uses an internal power D-MOS transistor (with a typical Rdson of 0.
15ohm) to obtain very high efficiency and very fast switching times.
Switching frequency up to 300KHz are achievable (the maximum power dissipation of the packages must be observed).
A wide input voltage range between 8V to 55V and output voltages regulated from 3.
3V to 40V cover the majority of the today applications.
Features of this new generation of DC-DC conPIN CONNECTIONS (Top view) verter includes pulse by pulse current limit, hiccup mode for output short circuit protection, voltage feed forward regulation, soft start, input/output synchronization, protection against feedback loop di...


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