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L5971

STMicroelectronics
Part Number L5971
Manufacturer STMicroelectronics
Description 1.5A STEP DOWN SWITCHING REGULATOR
Published Mar 22, 2005
Detailed Description ® L5971 1.5A STEP DOWN SWITCHING REGULATOR UP TO 1.5A STEP DOWN CONVERTER OPERATING INPUT VOLTAGE FROM 6.5V TO 28V PRE...
Datasheet PDF File L5971 PDF File

L5971
L5971

Overview
® L5971 1.
5A STEP DOWN SWITCHING REGULATOR UP TO 1.
5A STEP DOWN CONVERTER OPERATING INPUT VOLTAGE FROM 6.
5V TO 28V PRECISE 1.
26V (±1%) INTERNAL REFERENCE VOLTAGE OUTPUT VOLTAGE ADJUSTABLE FROM 1.
26V TO 20V SWITCHING FREQUENCY ADJUSTABLE UP TO 500KHz VOLTAGE FEEDFORWARD ZERO LOAD CURRENT OPERATION INTERNAL CURRENT LIMITING (PULSE-BYPULSE AND HICCUP MODE) INHIBIT FOR ZERO CURRENT CONSUMPTION PROTECTION AGAINST FEEDBACK DISCONNECTION THERMAL SHUTDOWN SOFT START FUNCTION DESCRIPTION The L5971 is a step down monolithic power switching regulator delivering 1.
5A at a voltage between 1.
26V and 20V (selected by a simple external divider).
Realized in BCD mixed technology, the device uses an internal power D-MOS transistor (with a typical Rdson of 0.
25Ω) to obtain very high efficency and high switching speed.
TYPICAL APPLICATION CIRCUIT Vi=6V to 28V R1 22K 3(4) 2(3) C2 1.
2nF C5 47nF Minidip SO16W ORDERING NUMBERS: L5971 (Minidip) L5971D (SO16) A switching frequency up to 500KHz is achievable (the maximum power dissipation of the packages must be observed).
Features of this new generations of DC-DC converter include pulse-by-pulse current limit, hiccup mode for short circuit protection, voltage feedforward regulation, soft-start, protection against feedback loop disconnection, inhibit for zero current consumption and thermal shutdown.
The device is available in plastic dual in line, MINIDIP 8 for standard assembly, and SO16 for SMD assembly.
Typical Applications: - High efficiency step-down converter - Portable computers - Battery charger - Distributed power - PDAs and Mobile Comminicators 5(11) 8(14) L5971 7(13) 4(5,6) VO=2.
5V/1.
5A L1 30µH R3 1(2) 6(12) C1 47µF 30V R2 9.
1K C4 22nF C6 100nF D1 STPS 3L40U C8 330µF R4 D98IN832C May 2000 1/11 L5971 BLOCK DIAGRAM VCC 5 THERMAL SHUTDOWN VOLTAGES MONITOR CBOOT CHARGE SS_INH 2 INHIBIT SOFTSTART 1.
26V COMP FB 7 8 E/A INTERNAL REFERENCE INTERNAL SUPPLY 5.
1V 6 PWM BOOT R S 1.
26V Q DRIVE OSCILLATOR 1 GND CBOOT...


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