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STMicroelectronics Electronic Components Datasheet

L4974A Datasheet

3.5A SWITCHING REGULATOR

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L4974A pdf
® L4974A
3.5A SWITCHING REGULATOR
. 3.5A OUTPUT CURRENT
. 5.1V TO 40V OUTPUT VOLTAGE RANGE
. 0 TO 90% DUTY CYCLE RANGE
. INTERNAL FEED-FORWARD LINE REG.
. INTERNAL CURRENT LIMITING
. PRECISE 5.1V ± 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
MULTIPOWER BCD TECHNOLOGY
POWERDIP (16 + 2 + 2)
ORDERING NUMBER : L4974A
DESCRIPTION
The L4974Aisa stepdownmonolithicpower switch-
ing 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
efficiency and very fast switching times. Features of
the L4974A include reset and power fail for micro-
processors, feed forward line regulation, soft start,
limiting current and thermal protection. The device
is mountedin a Powerdip16 + 2 + 2 plastic package
and requires few external components. Efficient
operation at switching frequencies up to 200KHz
allows reductionin the size and cost of externalfilter
component.
BLOCK DIAGRAM
June 2000
1/22
This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.


STMicroelectronics Electronic Components Datasheet

L4974A Datasheet

3.5A SWITCHING REGULATOR

No Preview Available !

L4974A pdf
L4974A
ABSOLUTE MAXIMUM RATINGS
Symbo l
V11
V11
V20
I20
VI
V4, V8
V3
I3
V2, V7, V9, V10
I2
I7
I8
Ptot
TJ, Tstg
P ar am et e r
Input Voltage
Input Operating Voltage
Output DC Voltage
Output Peak Voltage at t = 0.1µs f = 200khz
Maximum Output Current
Boostrap Voltage
Boostrap Operating Voltage
Input Voltage at Pins 4, 12
Reset Output Voltage
Reset Output Sink Current
Input Voltage at Pin 2, 7, 9, 10
Reset Delay Sink Current
Error Amplifier Output Sink Current
Soft Start Sink Current
Total Power Dissipation at TPINS 90°C
at T amb = 70°C (No copper area on PCB)
Junction and Storage Temperature
V alu e
55
50
-1
-5
Internally Limited
65
V11 + 15
12
50
50
7
30
1
30
5
1.3
-40 to 150
Unit
V
V
V
V
V
V
V
V
mA
V
mA
A
mA
W
W
°C
PIN CONNECTION (top view)
THERMAL DATA
S ymb ol
Rth j-pins
Rth j-amb
Parameter
Thermal Resistance Junction-Pins
Thermal Resistance Junction-ambient
2/22
max
max
Valu e
12
60
Unit
°C/W
°C/W


Part Number L4974A
Description 3.5A SWITCHING REGULATOR
Maker STMicroelectronics
Total Page 22 Pages
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