L4977A, US $ 4.55-5.44 , STMicroelectronics, L4977A DataSheet download, circuit diagram from SeekIC.com

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SeekIC No. : 00586190 Detail

L4977A: Switching Converters, Regulators & Controllers 5.1 to 40V 7.0 Amp

L4977A Data Sheet

US $ 4.55~5.44 / Piece | Get Latest Price

Part Number:: L4977A
Mfg:: STMicroelectronics
Supply Ability:: 5000

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0~165
165~250
250~500
500~1000

Unit Price
$5.44
$5.11
$4.9
$4.55

Processing time
15 Days
15 Days
15 Days
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Product Details

Quick Details

Output Voltage :	40 V	Mounting Style :	Through Hole
Package / Case :	Multiwatt-15	Packaging :	Tube

Description

Output Current :
Output Power :
Input Voltage :
Switching Frequency :
Operating Temperature Range :
Packaging : Tube
Mounting Style : Through Hole
Output Voltage : 40 V
Package / Case : Multiwatt-15

Features:

· 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
· RESETAND POWER FAIL FUNCTIONS
· SOFT START
· INPUT/OUTPUT SYNC PIN
· UNDER VOLTAGE LOCK OUT WITH HYSTERETIC TURN-ON
· PWM LATCH FOR SINGLE PULSE PER PERIOD
· VERY HIGH EFFICIENCY
· SWITCHING FREQUENCY UP TO 500KHz
· THERMAL SHUTDOWN
· CONTINUOUS MODE OPERATION

Specifications

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
I₇	Maximum Output Current	Internally Limited
V₆	Bootstrap Voltage Bootstrap 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 T_case < 120	30	W
T_j, T_stg	Junction and Storage Temperature	-40 to 150

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 DMOSoutput 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.

Parameters:

Technical/Catalog Information	L4977A
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	7A
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 ~ 500kHz
Drawing Number	*
Lead Free Status	Lead Free
RoHS Status	RoHS Compliant
Other Names	L4977A L4977A 497 5336 5 ND 49753365ND 497-5336-5

L4977A

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