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STMicroelectronics Electronic Components Datasheet

L5972D013TR Datasheet

2A SWITCH STEP DOWN SWITCHING REGULATOR

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L5972D013TR pdf
L5972D
2A SWITCH STEP DOWN SWITCHING REGULATOR
s 2A INTERNAL SWITCH
s OPERATING INPUT VOLTAGE FROM 4.4V
TO 36V
s OUTPUT VOLTAGE ADJUSTABLE FROM
1.235V TO 35V
s LOW DROPOUT OPERATION: 100% DUTY
CYCLE
s 250KHz INTERNALLY FIXED FREQUENCY
s VOLTAGE FEEDFORWARD
s ZERO LOAD CURRENT OPERATION
s INTERNAL CURRENT LIMITING
s PROTECTION AGAINST FEEDBACK
DISCONNECTION
s THERMAL SHUTDOWN
APPLICATIONS:
s CONSUMER: STB, DVD, TV, VCR,CAR
RADIO, LCD MONITORS
s NETWORKING: XDSL, MODEMS,DC-DC
MODULES
s COMPUTER: PRINTERS, AUDIO/GRAPHIC
CARDS, OPTICAL STORAGE, HARD DISK
DRIVE
s INDUSTRIAL: CHARGERS, CAR BATTERY
DC-DC CONVERTERS
SO8 (4+2+2)
ORDERING NUMBERS: L5972D (SO8)
L5972D013TR (Tape & Reel)
DESCRIPTION
The L5972D is a step down monolithic power switch-
ing regulator with a minimum switch current limit of
2A so it is able to deliver more than 1.5A DC current
to the load depending on the application conditions.
The output voltage can be set from 1.235V to 35V.
The device uses an internal P-Channel D-MOS tran-
sistor (with a typical Rdson of 250m) as switching
element to minimize the size of the external compo-
nents.
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 com-
puter related applications.
Pulse by pulse current limit with the internal frequen-
cy modulation offers an effective constant current
short circuit protection.
TEST APPLICATION CIRCUIT
VIN = 4.4V to 35V
VCC
8
C1
10µF
35V
CERAMIC
COMP
C4
22nF
4
6
C3
220pF
R3
4.7K
L5972D
OUT
1
L1 33µH
D1
STPS2L40U
5
237
FB
GND
VOUT=3.3V
R1
5.6K
R2
3.3K
C2
100µF
10V
May 2003
D03IN1436
1/10


STMicroelectronics Electronic Components Datasheet

L5972D013TR Datasheet

2A SWITCH STEP DOWN SWITCHING REGULATOR

No Preview Available !

L5972D013TR pdf
L5972D
PIN CONNECTION
OUT
GND
GND
COMP
18
27
36
45
D02IN1367
VCC
GND
GND
FB
PIN DESCRIPTION
N° Pin
Function
1 OUT Regulator Output.
2,3,6,7 GND Ground.
4 COMP E/A output for frequency compensation.
5 FB Feedback input. Connecting directly to this pin results in an output voltage of 1.23V. An external
resistive divider is required for higher output voltages.
8 VCC Unregulated DC input voltage.
THERMAL DATA
Symbol
Parameter
Rth (j-amb) Thermal Resistance Junction to ambient
(*) Package mounted on board (4cm2 ground-plane)
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
V8 Input Voltage
V1 Out pin DC voltage
Out pin peak voltage at t = 0.1µs
I1 Maximum output current
V4, V5 Analog pins
Ptot Power dissipation at Tamb 70°C
Tj Operating junction temperature range
Tstg Storage temperature range
Max.
Value
65 (*)
Unit
°C/W
Value
40
-1 to 40
-5 to 40
int. limit.
4
1.2
-40 to 150
-55 to 150
Unit
V
V
V
V
W
°C
°C
2/10


Part Number L5972D013TR
Description 2A SWITCH STEP DOWN SWITCHING REGULATOR
Maker STMicroelectronics
Total Page 10 Pages
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1 L5972D013TR 2A SWITCH STEP DOWN SWITCHING REGULATOR STMicroelectronics
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