L5970 STMICROELECTRONICS [STMicroelectronics], L5970 Datasheet

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L5970

Manufacturer Part Number
L5970
Description
UP TO 1A STEP DOWN SWITCHING REGULATOR
Manufacturer
STMICROELECTRONICS [STMicroelectronics]
Datasheet

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APPLICATIONS:
TEST APPLICATION CIRCUIT
May 2003
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
SINCHRONIZATION
PROTECTION AGAINST FEEDBACK
DISCONNECTION
THERMAL SHUTDOWN
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: CHARGERS, CAR BATTERY
DC-DC CONVERTERS
CERAMIC
VIN = 4.4V to 35V
10 F
35V
C1
UP TO 1A STEP DOWN SWITCHING REGULATOR
220pF
3.3V
22nF
C4
C3
SYNC.
COMP
VREF
VCC
4.7K
R3
6
8
2
4
INH.
L5970D
3
7
GND
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 ) 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.
D98IN954C
1
5
ORDERING NUMBERS: L5970D (SO8)
OUT
FB
STPS2L40U
L1 33 H
D1
SO8
5.6K
3.3K
R1
R2
VOUT=3.3V
L5970D013TR (T&R)
100 F
10V
C2
L5970D
1/10

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L5970 Summary of contents

Page 1

... CERAMIC 220pF May 2003 DESCRIPTION The L5970D is a step down monolithic power switching regulator capable to deliver output voltages from 1.2V to 35V. The device uses an internal P-Channel D-MOS transistor (with a typical Rdson of 250m ) as switching element to minimize the size of the ex- ternal components ...

Page 2

... L5970D PINS CONNECTION (Top View) PINS FUNCTION N. Name 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. ...

Page 3

... CC ( 0.74V sync V = 2.33V sync I = 3mA source no load 1.65V sync 5mA REF V = 4.4V to 36V 0mA REF V = 4.4V to 36V 5mA REF L5970D Min. Typ. Max 0.25 0.5 * 1.5 1.87 2.25 * 212 250 280 225 250 275 0 100 1.220 1.235 1.25 * 1.198 1.235 1.272 ...

Page 4

... L5970D Figure 1. Junction Temperature vs. Output Current (SO8) *) Tj(°C) 130 120 110 100 Vcc=5V 90 Tamb=25° 0.2 0.4 0.6 0.8 1 Io(A) Figure 2. Junction Temperature vs. Output Current (SO8) *) Tj(°C) 130 120 110 100 Vcc=12V 90 Tamb=25° 0.2 0.4 0.6 0.8 1 Io(A) Figure 3. Junction Temperature vs. Output Current (SO8) *) Tj(° ...

Page 5

... Vcc = 12V 1.4 1.2 - (°C) Figure 8. Shutdown Current vs.Junction Temperature Ishd ( Vcc = 12V - (°C) Figure 9. Switching Frequency vs.Junction Temperature Fsw (KHz) 260 250 240 230 220 100 150 -50 100 150 L5970D Vcc = 12V 100 Tj (C) 150 5/10 ...

Page 6

... Vo=3. Vo=2. Vo=1. Vcc= 0.1 0.2 0.3 0.4 0.5 0.6 Io (A) 6/10 VREF 6 1 VCC 8 L5970D SYNC COMP INH. GND R3 4.7K D03IN1437 Part Number Description 10 F, 25V 100 F, 10V 220pF, 5%, 50V 22nF, 10%, 50V 5.6K, 1%, 0.1W 0603 3.3K, 1%, 0.1W 0603 4.7K, 1%, 0.1W 0603 2A, 25V Figure 12. Efficiency vs. Output Current ...

Page 7

... Figure 13. PCB layout (component side) Figure 14. PCB layout (bottom side) Figure 15. PCB layout (front side) 42mm 34mm L5970D 7/10 ...

Page 8

... C4 SYNC VREF GND INH 22nF R3 4.7k 3.3V OUT STPS2L25U L5970 GND INH 3.3V OUT VCC VCC 8 1 L5970D COMP COMP INH SYNC VREF GND D2 VOUT1=5V 1N4148 30mA N1/N2=2 Lp=22uH VOUT=3.3V 0. 100uF 47uF 10V 10V L1 33uH D1 STPS2L25U VOUT=-12V/0 ...

Page 9

... D and F do not include mold flash or protrusions. Mold flash or potrusions shall not exceed 0.15mm (.006inch). inch MIN. TYP. MAX. 0.069 0.010 0.065 0.033 0.019 0.010 0.020 0.197 0.244 0.050 0.150 0.15 0.157 0.050 0.024 OUTLINE AND MECHANICAL DATA SO8 L5970D 9/10 ...

Page 10

... L5970D Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice ...

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