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E-L4973D3.3 Datasheet(PDF) 1 Page - STMicroelectronics

Part No. E-L4973D3.3
Description  3.5A step down switching regulator
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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May 2007
Rev 17
1/27
27
L4973
3.5A step down switching regulator
Features
Up to 3.5A step down converter
Operating input voltage from 8V to 55V
3.3V and 5.1V (±1%) fixed output, and
adjustable outputs from:
– 0.5V to 50V (3.3 type)
– 5.1V to 50V (5.1 type)
Frequency adjustable up to 300kHz
Voltage feed forward
Zero load current operation (min 1mA)
Internal current limiting (pulse by pulse and
HICCUP mode)
Precise 5.1V (1.5%) reference voltage
externally available
Input/output synchronization function
Inhibit for zero current consumption (100mA
typ. at VCC = 24V)
Protection against feedback disconnection
Thermal shutdown
Output over voltage protection
Soft start function
Description
The L4973 is a step down monolithic power
switching regulator delivering 3.5A at fixed
voltages of 3.3V or 5.1V and using a simple
external divider output adjustable voltage up to
50V. Realized in BCD mixed technology, the
device uses an internal power D-MOS transistor
(with a typical RDS(on) of 0.15Ω) to obtain very
high efficiency and very fast switching times.
Switching frequency up to 300KHz are 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 the today applications.
Features of this new generation of DC-DC
converter includes pulse by pulse current limit,
hiccup mode for output short circuit protection,
voltage feed forward regulation, soft start,
input/output synchronization, protection against
feedback loop disconnection, inhibit for zero
current consumption and thermal shutdown.
Packages available are in plastic dual in line, DIP-
18 (12+3+3) for standard assembly, and SO20
(12+4+4) for SMD assembly.
DIP-18 (12+3+3)
SO-20 (12+4+4)
www.st.com
Figure 1.
Internal schematic diagram
L4973
V
CC (8V to 55V)
CIN
C2
ROSC
COSC
D1
L1
COUT
VO(3.3V or 5.1V)
CBOOT
4,5,6,10
13,14,15
7
9
8
1
11
3
D97IN554A
17
RCOMP
CCOMP
CSS
2
16
12




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