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L4973V51, L4974A, L4975

Table of contents:
Info of L4973V51
Info of L4974A
Info of L4975

L4973V51, L4974A, L4975 Selling Leads, Datasheet

MFG:STMicroelectronics Category:Integrated Circuits (ICs) Package Cooled:N/A D/C:0 3

L4973V51, L4974A, L4975 Datasheet download

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Part Number: L4974A

Category: Integrated Circuits (ICs)

MFG: STMicroelectronics

Package Cooled: N/A

D/C: 0 3

Description: IC REG SW 3.5A 5.1V-40V 20-DIP

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L4974A Parameters

Technical/Catalog Information	L4974A
Vendor	STMicroelectronics
Category	Integrated Circuits (ICs)
Type	Step-Down (Buck)
Number of Outputs	1
Voltage - Input	15 ~ 50 V
Voltage - Output	5.1 ~ 40 V
Current - Output	3.5A
Power - Output	1.3W
Package / Case	20-DIP
Packaging	Tube
Internal Switch(s)	Yes
Synchronous	Yes
Rds (On)	-
Operating Temperature	0°C ~ 125°C
Frequency - Switching	100kHz
Lead Free Status	Lead Free
RoHS Status	RoHS Compliant
Other Names	L4974A L4974A 497 6699 5 ND 49766995ND 497-6699-5

L4974A General Description

The L4974Aisa stepdownmonolithicpowerswitching regulator delivering 3.5A 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 efficiencyand very fast switching times. Featuresof the L4974A include reset and power fail for microprocessors,feed forward line regulation, soft start,limiting current and thermal protection. The device is mountedin a Powerdip16 + 2 + 2 plasticpackage and requires few external components. Efficient operation at switching frequencies up to 200KHz allowsreductionin the size andcost of external filter component.

L4974A Maximum Ratings

Symbol	Parameter	Value	Unit
V₁₁	Input Voltage	55	V
V₁₁	Input Operating Voltage	50	V
V₂₀	Output DC Voltage Output Peak Voltage at t = 0.1s f =200khz	-1 -5	V V
I₂₀	Maximum Output Current	Internally Limited
V_I	Boostrap Voltage Boostrap Operating Voltage	65 V₁₁+15	V V
V₄,V₈	Input Voltage at Pins 4, 12	12	V
V₃	Reset Output Voltage	50	V
I₃	Reset Output Sink Current	50	mA
V₂,V₇,V₉,V₁₀	Input Voltage at Pin 2, 7, 9, 10	7	V
I₂	Reset Delay Sink Current	30	mA
I₇	Error Amplifier Output Sink Current	1	A
I₈	Soft Start Sink Current	30	mA
P_tot	Total Power Dissipation at T_PINS 90°Cat T_amb= 70°C (No copper area on PCB)	5 1.3	W W
T_J,T_STG	Junction and Storage Temperature	-40to150	°C

L4974A Features

·3.5AOUTPUT CURRENT .
·5.1V TO 40VOUTPUT VOLTAGERANGE
·0 TO 90%DUTY CYCLE RANGE .
·INTERNAL FEED-FORWARD LINEREG.
·INTERNALCURRENT LIMITING
·PRECISE5.1V ± 2% ON CHIP REFERENCE
·RESET AND POWER FAIL FUNCTIONS .
·INPUT/OUTPUT SYNC PIN
·UNDER VOLTAGE LOCK OUT WITH HYS.
·TERETIC TURN-ON PWM LATCH FOR SINGLE
·PULSE PER PE.RIOD
·VERY HIGH EFFICIENCY .
·SWITCHING FREQUENCY UP TO 200KHz
·THERMAL SHUTDOWN
·CONTINUOUS MODE OPERATION

L4974A Connection Diagram

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