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E-L4971 Datasheet(PDF) 1 Page - STMicroelectronics

Part No. E-L4971
Description  1.5A STEP DOWN SWITCHING REGULATOR
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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L4971
May 2005
1
FEATURES
UP TO 1.5A STEP DOWN CONVERTER
OPERATING INPUT VOLTAGE FROM 8V TO
55V
PRECISE 3.3V (±1%) INTERNAL
REFERENCE VOLTAGE
OUTPUT VOLTAGE ADJUSTABLE FROM
3.3V TO 50V
SWITCHING FREQUENCY ADJUSTABLE UP
TO 300KHz
VOLTAGE FEEDFORWARD
ZERO LOAD CURRENT OPERATION
INTERNAL CURRENT LIMITING (PULSE-
BYPULSE AND HICCUP MODE)
INHIBIT FOR ZERO CURRENT
CONSUMPTION
PROTECTION AGAINST FEEDBACK
DISCONNECTION
THERMAL SHUTDOWN
SOFT START FUNCTION
2
DESCRIPTION
The L4971 is a step down monolithic power
switching regulator delivering 1.5A at a voltage be-
tween 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 0.25
Ω) to obtain very high
efficency and high switching speed.
A switching frequency up to 300KHz 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 50V cover
the majority of today’s applications.
Features of this new generations of DC-DC con-
verter include pulse-by-pulse current limit, hiccup
mode for short circuit protection, voltage feedfor-
ward regulation, soft-start, protection against feed-
back loop disconnection, inhibit for zero current
consumption and thermal shutdown.
The device is available in plastic dual in line, DIP8
for standard assembly, and SO16W for SMD as-
sembly.
1.5A STEP DOWN SWITCHING REGULATOR
Rev. 11
Figure 1. Package
Table 1. Order Codes
Part Number
Package
L4971
DIP8
L4971D
SO16W
L4971D013TR
SO16 in Tape & Reel
SO16W
DIP8
Figure 1. Block Diagram
D97IN748A
5
2
8
4
1
L4971
C1
220
µF
63V
C8
330
µF
VO=3.3V/1.5A
Vi=8V to 55V
R1
20K
C2
2.7nF
R2
9.1K
C4
22nF
3
7
L1
126
µH
(77120)
6
D1
STPS
3L60U
C5
100nF
C7
220nF
C6
100nF




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