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PDF L5971 Data sheet ( Hoja de datos )
| Número de pieza | L5971 | |
| Descripción | 1.5A STEP DOWN SWITCHING REGULATOR | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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® L5971
1.5A STEP DOWN SWITCHING REGULATOR
UP TO 1.5A STEP DOWN CONVERTER
OPERATING INPUT VOLTAGE FROM 6.5V
TO 28V
PRECISE 1.26V (±1%) INTERNAL REFER-
ENCE VOLTAGE
OUTPUT VOLTAGE ADJUSTABLE FROM
1.26V TO 20V
SWITCHING FREQUENCY ADJUSTABLE UP
TO 500KHz
VOLTAGE FEEDFORWARD
ZERO LOAD CURRENT OPERATION
INTERNAL CURRENT LIMITING (PULSE-BY-
PULSE AND HICCUP MODE)
INHIBIT FOR ZERO CURRENT CONSUMP-
TION
PROTECTION AGAINST FEEDBACK DIS-
CONNECTION
THERMAL SHUTDOWN
SOFT START FUNCTION
DESCRIPTION
The L5971 is a step down monolithic power
switching regulator delivering 1.5A at a voltage
between 1.26V and 20V (selected by a simple
external divider). Realized in BCD mixed technol-
ogy, the device uses an internal power D-MOS
transistor (with a typical Rdson of 0.25Ω) to ob-
tain very high efficency and high switching speed.
TYPICAL APPLICATION CIRCUIT
Minidip
SO16W
ORDERING NUMBERS: L5971 (Minidip)
L5971D (SO16)
A switching frequency up to 500KHz is achiev-
able (the maximum power dissipation of the pack-
ages must be observed).
Features of this new generations of DC-DC con-
verter include pulse-by-pulse current limit, hiccup
mode for short circuit protection, voltage feedfor-
ward regulation, soft-start, protection against
feedback loop disconnection, inhibit for zero cur-
rent consumption and thermal shutdown.
The device is available in plastic dual in line,
MINIDIP 8 for standard assembly, and SO16 for
SMD assembly.
Typical Applications:
- High efficiency step-down converter
- Portable computers
- Battery charger
- Distributed power
- PDAs and Mobile Comminicators
Vi=6V to 28V
C1
47µF
30V
5(11)
8(14)
R1
22K L5971
3(4) 4(5,6)
C2
1.2nF
2(3)
C5
47nF
7(13) 1(2) 6(12)
R2
9.1K
C4
22nF
C6
100nF
D1
STPS
3L40U
L1
30µH
C8
330µF
VO=2.5V/1.5A
R3
R4
May 2000
D98IN832C
1/11
1 page  
Figure 1. Test and valutation board circuit.
L5971
Vi=6V to 28V
C1
47µF
30V
5(11)
8(14)
R1
22K L5971
3(4) 4(5,6)
C2
1.2nF
2(3)
C5
47nF
7(13) 1(2) 6(12)
R2
9.1K
C4
22nF
C6
100nF
D1
STPS
3L40U
L1
30µH
C8
330µF
D98IN832C
VO=2.5V/1.5A
R3
R4
VO (V)
1.8
1.5
2.5
3.3
5.1
12
15
R3 (KΩ) R4 (KΩ)
12
0.5 2
22
8.2 4.7
12 3.6
27 3
23 2
Figure 2. PCB and component layout of the figure 1.
SOLDER SIDE
COMPONENT SIDE
5/11
5 Page 
L5971
Information furnished is believed to be accurate and reliable. However, STMicroelectroni cs 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. Specification mentioned in this publication are
subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products
are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.
The ST logo is a registered trademark of STMicroelectronics
© 2000 STMicroelectronics – Printed in Italy – All Rights Reserved
STMicroelectronics GROUP OF COMPANIES
Australia - Brazil - China - Finland - France - Germany - Hong Kong - India - Italy - Japan - Malaysia - Malta - Morocco -
Singapore - Spain - Sweden - Switzerland - United Kingdom - U.S.A.
http://www.st.com
11/11
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet L5971.PDF ] | |
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