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L4975A, L4976, L4976-4B

Table of contents:
Info of L4975A
Info of L4976
Info of L4976-4B

L4975A, L4976, L4976-4B Selling Leads, Datasheet

MFG:STMicroelectronics Category:Integrated Circuits (ICs) Package Cooled:ZIP D/C:07+

L4975A, L4976, L4976-4B Datasheet download

Five Points

Part Number: L4976

Category: Integrated Circuits (ICs)

MFG: STMicroelectronics

Package Cooled: ZIP

D/C: 07+

Description: IC REG SW 1A ADJ STEPDOWN 8-DIP

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L4975A Parameters

Technical/Catalog Information	L4975A
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	5A
Power - Output	30W
Package / Case	Multiwatt-15 (Vertical, Bent and Staggered Leads)
Packaging	Tube
Internal Switch(s)	Yes
Synchronous	Yes
Rds (On)	-
Operating Temperature	0°C ~ 125°C
Frequency - Switching	200kHz
Lead Free Status	Lead Free
RoHS Status	RoHS Compliant
Other Names	L4975A L4975A 497 5335 5 ND 49753355ND 497-5335-5

L4975A General Description

The L4975A is a stepdown monolithic power switching regulator delivering 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 efficiency and very fast switching times. Features of the L4975A 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.

L4975A Maximum Ratings

Symbol	Parameter	Value	Unit
V₉	Input Voltage	55	V
V₉	Input Operating Voltage	50	V
V₇	Output DC Voltage Output Peak Voltage at t = 0.1s f =200khz	-1 -7	V V
I₇	Maximum Output Current	Internally Limited
V₆	Boostrap Voltage Boostrap Operating Voltage	65 V₉+15	V V
V₃,V₁₂	Input Voltage at Pins 3, 12	12	V
V₄	Reset Output Voltage	50	V
I₄	Reset Output Sink Current	50	mA
V₅,V₁₀,V₁₁,V₁₃	Input Voltage at Pin 5, 10, 11, 13	7	V
I₅	Reset Delay Sink Current	30	mA
I₁₀	Error Amplifier Output Sink Current	1	A
I₁₂	Soft Start Sink Current	30	mA
P_tot	Total Power Dissipation at Tcase < 120°C	30	W
T_J,T_STG	Junction and Storage Temperature	-40to150	°C

L4975A Features

·5A OUTPUT CURRENT
·5.1V TO 40V OUTPUT VOLTAGERANGE
·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 HYSTERETIC TURN-ON
·PWM LATCH FOR SINGLE PULSE PER PERIOD
·VERYHIGH EFFICIENCY
·SWITCHING FREQUENCY UP TO 500KHz
·THERMAL SHUTDOWN
·CONTINUOUS MODE OPERATION

L4976 Parameters

Technical/Catalog Information	L4976
Vendor	STMicroelectronics
Category	Integrated Circuits (ICs)
Type	Step-Down (Buck)
Number of Outputs	1
Voltage - Input	8 ~ 55 V
Voltage - Output	0.5 ~ 50 V
Current - Output	1A
Power - Output	1W
Package / Case	8-DIP (300 mil)
Packaging	Tube
Internal Switch(s)	Yes
Synchronous	No
Rds (On)	250 mOhm
Operating Temperature	0°C ~ 125°C
Frequency - Switching	100kHz
Lead Free Status	Lead Free
RoHS Status	RoHS Compliant
Other Names	L4976 L4976 497 6700 5 ND 49767005ND 497-6700-5

L4976 General Description

The L4976 is a step down monolithic power switching regulator delivering 1A at a voltage between 3.3V and 50V (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 0.25W) to obtain very high efficency and high switching speed.

A switching frequency up to 250KHz is 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 today's applications.Features of this new generations of DC-DC converter include pulse-by-pulse current limit, hiccup
mode for short circuit protection, voltage feedforward regulation, protection against feedback loop disconnectionand thermal shutdown.

The device is available in plastic dual in line,MINIDIP 8 for standard assembly, and SO16W for SMD assembly.

L4976 Maximum Ratings

Symbol		Parameter		Value	Unit
Minidip	SO16	Parameter		Value	Unit
V₅	V₁₁	Input voltage		58	V
V₄	V₅,V₆	Output DC voltage Output peak voltage at t = 0.1s f=200KHz		-1 -5	V V
I₄	I₅,I₆	Maximum output current		int. limit.
V₆-V₅	V₁₂-V₁₁			14	V
V₆	V₁₂	Bootstrap voltage		70	V
V₇	V₁₃	Analogs input voltage (V_CC = 24V)		12	V
V₈	V₁₄	(V_CC = 20V)		6 -0.3	V V
P_tot		Power dissipation a T_amb 60°C	Minidip	1	W
P_tot		Power dissipation a T_amb 60°C	SO16	0.8	W
T_j,T_stg		Junction and storage temperature		-40to150	°C

L4976 Features

·UP TO 1A STEP DOWN CONVERTER
·OPERATING INPUT VOLTAGE FROM 8V TO 55V
·PRECISE 5.1V REFERENCE VOLTAGE
·OUTPUT VOLTAGE ADJUSTABLE FROM 3.3V TO 50V
·SWITCHING FREQUENCY ADJUSTABLE UP TO 500KHz
·VOLTAGEFEEDFORWARD ZERO LOAD CURRENT OPERATION
·INTERNAL CURRENT LIMITING (PULSE-BYPULSE AND HICCUPMODE)
·PROTECTION AGAINST FEEDBACK DISCONNECTION
·THERMAL SHUTDOWN

L4976 Connection Diagram

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