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L5970D Datenblatt(PDF) 1 Page - STMicroelectronics

Teilenummer L5970D
Bauteilbeschribung  Up to 1A step down switching regulator
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Hersteller  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L5970D Datenblatt(HTML) 1 Page - STMicroelectronics

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January 2007
Rev 14
1/16
16
L5970D
Up to 1A step down switching regulator
General features
Up to 1A output current
Operating input voltage from 4.4V to 36V
3.3V / (±2%) reference voltage
Output voltage adjustable from 1.2V to 35V
Low dropout operation: 100% duty cycle
250KHz Internally fixed frequency
Voltage feedforward
Zero load current operation
Internal current limiting
Inhibit for zero current consumption
Synchronization
Protection against feedback disconnection
Thermal shutdown
Applications
Consumer: STB, DVD, TV, VCR, car radio,
LCD monitors
Networking: XDSL, modems, DC-DC modules
Computer: printers, audio/graphic cards,
optical storage, hard disk drive
Industrial: changers, car battery, DC-DC
converters
Description
The L5970D is a step down monolithic power
switching regulator capable to deliver up to 1A at
output voltages from 1.2V to 35V.
The device uses an internal P-Channel D-MOS
transistor (with a typical Rdson of 250m
Ω) as
switching element to minimize the size of the
external components.
An internal oscillator fixes the switching frequency
at 250KHz.
Having a minimum input voltage of 4.4V only, it is
particularly suitable for 5V bus, available in all
computer related applications.
Pulse by pulse current limit with the internal
frequency modulation offers an effective constant
current short circuit protection.
SO8
www.st.com
Test application circuit
D98IN954C
8
2
4
5
1
7
L5970D
C1
10
µF
35V
CERAMIC
C2
100
µF
10V
VOUT=3.3V
VIN = 4.4V to 35V
R1
5.6K
R2
3.3K
R3
4.7K
C4
22nF
C3
220pF
3
6
D1
STPS2L40U
3.3V
INH.
SYNC.
COMP
VCC
VREF
OUT
FB
GND
L1 33
µH


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