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L5970D
UP TO 1A STEP DOWN SWITCHING REGULATOR
JerTpra'
L5970D
UP TO IA STEP DOWN SWITCHING REGULATOR
UP TO 1A OUTPUT CURRENT
OPERATING INPUT VOLTAGE FROM 4.4V
TO 36V
n 3.3V/(i2%) / REFERENCE VOLTAGE
n OUTPUT VOLTAGE ADJUSTABLE FROM
1.2VTO 35V
n LOW DROPOUT OPERATION: 100% DUTY
250KHZ INTERNALLY FIXED FREQUENCY
VOLTAGE FEEDFORWARD
ZERO LOAD CURRENT OPERATION
INTERNAL CURRENT LIMITING
INHIBIT FOR ZERO CURRENT CONSUMPTION
SINCHRONIZATION
PROTECTION AGAINST FEEDBACK DIS-
CONNECTION
n TH ERMAL SHUTDOWN
APPLICATIONS:
u CONSUMER: STB, DVD, TV, VCR,
CAR RADIO, LCD MONITORS
n NETWORKING: XDSL, MODEMS,
DC-DC MODULES
n COMPUTER: PRINTERS, AUDIO/GRAPHIC
CARDS, OPTICAL STORAGE, HARD DISK
" INDUSTRIAL: CHARGERS, CAR BATTERY
DC-DC CONVERTERS
TEST APPLICATION CIRCUIT
ORDERING NUMBERS:
L597OD(SO-8)
L5970D013TR (T&R)
DESCRIPTION
The L5970D is a step down monolithic power
switching regulator capable to deliver up to IA at
output voltages from 1.2V to 35V.
The device uses an internal P-Channel D-MOS
transistor (with a typical Rdson of 250mf2) as
switching element to minimize the size of the ex-
ternal 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 fre-
quency modulation offers an effective constant
current short circuit protection.
1/lN=4.4 to 35V VCC
L597OD
10uF - l:| C4
35V C2 C3 T SYNC VREF. R2 -100uF
Cerami 220pF 22nF 10V
4.7K l
33uH VOUT=3.3V
February 2003
L5970D
PINS CONNECTION (top view)
OUT I: 1 V 8 Cl VCC
SYNC E 2 7 Cl GND
INH I: 3 6 Cl VREF
COMP l: 4 5 Cl FB
D98IN955
PINS FUNCTION
N. Name Description
1 OUT Regulator Output.
2 SYNC Master/slave synchronization.
3 INH A logical signal (active high) disables the device. If INH not used the pin must be grounded.
When it is open an internal pull-up disable the device.
4 COMP E/A output for frequency compensation.
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.
6 VREF 3.3V VREF. No cap is requested for stability.
GND Ground.
VCC Unregulated DC input voltage.
THERMAL DATA
Symbol Parameter Value Unit
Rm 0.amb) Thermal Resistance Junction to ambient Max. 120 (*) ''CM/
(*) Package mounted on board
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
V8 Input Voltage 40 V
V1 Output DC voltage -1 to 40 V
Output peak voltage at t = 0.1 ps -5 to 40 V
" Maximum output current int. limit.
V4, Vs Analog pins 4 V
V3 INH -0.3V to VCC
V2 SYNC -0.3 to 4 V
Ptot Power dissipation at Tamb s: 60°C 0.75 W
I Operating junction temperature range -40 to 150 ''C
Tstg Storage temperature range -55 to 150 °C
