L4977A - ST Microelectronics

The pictures are for reference only, and the specific specifications can be found in the product manual.

Part No

L4977A
Manufacturer

ST Microelectronics
ChipWorker Part#

CW5544404
Category

DC to DC Converter
Package

Multiwatt-15
Description

Conv DC-DC 15V to 50V Step Down Single-Out 5.1V to 40V 7A 15Pin(15+Tab) MULTIWATT V
Documentation

Datasheet

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L4977A Specifications

Attribute	Attribute Value

Part Number	L4977A
Manufacturer	ST Microelectronics
ChipWorker Part#	CW5544404
Category	DC to DC Converter
Documentation	Datasheet
Mounting Style	Through Hole
Number of Pins	15 Pin
Case/Package	Multiwatt-15
Supply Voltage (DC)	50.0V (max)
Operating Voltage	15V ~ 50V
Number of Outputs	1 Output
Output Voltage	5.1V ~ 40V
Output Current	7 A
Number of Channels	1 Channel
Output Power	30 W
Switching Frequency	200kHz ~ 500kHz
Topology	Buck
Input Voltage (Max)	50 V
Input Voltage (Min)	15 V
Output Voltage (Max)	40 V
Output Voltage (Min)	5.1 V
Output Current (Max)	7 A
Operating Temperature (Max)	150 ℃
Operating Temperature (Min)	-40 ℃
Supply Voltage	15 V
Input Voltage	15V ~ 50V
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Size-Length	19.6 mm
Size-Width	5 mm
Size-Height	10.7 mm
Operating Temperature	-40℃ ~ 150℃ (TJ)
Product Lifecycle Status	Active
Packaging	Tube
RoHS	RoHS Compliant
Lead-Free Status	Lead Free
ECCN Code	EAR99

Product Description

DESCRIPTION
The L4977A is a stepdown monolithic power switching regulator delivering 7A at a voltage variable from 5.1 to 40V.
Realized with BCD mixed technology, the device uses a DMOS output transistor to obtain very high efficiency and very fast switching times. Features of the L4977A include reset and power fail for microprocessors, feed forward line regulation, soft start, limiting current and thermal protection. The device is mounted in a 15-lead multiwatt plastic power package and requires few external components. Efficient operation at switching frequencies up to 500KHz allows reduction in the size and cost of external filter components.
■ 7A OUTPUT CURRENT
■ 5.1V TO 40V OUTPUT VOLTAGE RANGE
■ 0 TO 90% DUTY CYCLE RANGE
■ INTERNAL FEED-FORWARD LINE REGULATION
■ INTERNAL CURRENT LIMITING
■ PRECISE 5.1V ± 2% ON CHIP REFERENCE
■ RESET AND POWER FAIL FUNCTIONS
■ SOFT START
■ INPUT/OUTPUT SYNC PIN
■ UNDER VOLTAGE LOCK OUT WITH HYS TERETIC TURN-ON
■ PWM LATCH FOR SINGLE PULSE PER PERIOD
■ VERY HIGH EFFICIENCY
■ SWITCHING FREQUENCY UP TO 500KHz
■ THERMAL SHUTDOWN
■ CONTINUOUS MODE OPERATION

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