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PDF SC1545 Datasheet ( Hoja de datos )

Número de pieza SC1545
Descripción 500mA SmartLDOTM With Power Up Signal Sequencing
Fabricantes Semtech Corporation 
Logotipo Semtech Corporation Logotipo



Total 8 Páginas
		
SC1545 Hoja de datos, Descripción, Manual
500mA SmartLDOTM With Power Up
Signal Sequencing
SC1545
PRELIMINARY - January 17, 2000
DESCRIPTION
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
FEATURES
The SC1545 was designed for instantly available moth-
erboard applications. As part of the Semtech family of
SmartLDO’s it provides additional control functions not
available in a standard LDO.
500mA LDO with Over Current Protection (OCP)
±2.5% LDO regulation over line, load and
temperature
Power sequencing for three supplies
The device provides the capability to control three sep-
arate supplies. There is an on-board 500mA, 2.5V
LDO with current limit protection, and drive pins for an
N-channel MOSFET and a P-channel MOSFET. Inter-
nal logic circuitry ensures that the system starts up in a
controlled manner, and that the correct outputs are en-
abled during specific sequences of BF_CUT and SLP.
The LDO draws its power from the 5V standby supply,
and the N-channel MOSFET drive is derived from the
12V supply.
The SC1545 is available in the surface mount SO-8
package.
APPLICATIONS
Instantly available motherboards
Embedded systems
Desktop computers
ORDERING INFORMATION
Part Number(1)
SC1545CS
Package
SO-8
Note:
(1) Add suffix ‘TR’ for tape and reel packaging.
TYPICAL APPLICATION CIRCUIT
2.5V OUT
2.5V IN
Q1
3.3V IN
Q2
C1
2 x 100uF
Si4410
C2
100uF
C3
2 x 100uF
IRLMS6802
3.3V OUT
C4
100uF
2.5V OUT
C5
10uF
U1
1 VO
2 GND
3 PDR
4
NDR
5VSTBY
12VIN
BF_CUT
SLP
8
7
6
5
SC1545
5V STANDBY
12V IN
BF_CUT
SLP
C6 C7
1uF 0.1uF
© 2000 SEMTECH CORP.
1
652 MITCHELL ROAD NEWBURY PARK CA 91320

1 page

SC1545 pdf
500mA SmartLDOTM With Power Up
Signal Sequencing
SC1545
PRELIMINARY - January 17, 2000
TYPICAL CHARACTERISTICS
12VIN Quiescent Current vs.
Junction Temperature
1000
12VIN = 12V
900
800
700
600
500
400
300
200
100
0
0 25 50 75 100
TJ (°C)
125
5VSTBY Quiescent Current (OFF) vs.
Junction Temperature
5.0
5VSTBY = 5V
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
0
25 50 75 100 125
TJ (°C)
LDO Output Voltage vs.
Junction Temperature
2.550
5VSTBY = 5V
2.545
2.540
2.535
2.530
IO = 1mA
2.525
2.520
2.515
2.510
IO = 500mA
2.505
2.500
0
25 50 75 100 125
TJ (°C)
5VSTBY Quiescent Current (ON) vs.
Junction Temperature
10.0
5VSTBY = 5V
9.5
9.0
8.5
8.0
7.5
7.0
6.5
6.0
5.5
5.0
0
25 50 75 100 125
TJ (°C)
4.5
4.5
4.4
4.4
4.3
4.3
4.2
4.2
4.1
4.1
4.0
0
5VSTBY Under Voltage Lockout vs.
Junction Temperature
5VSTBY RISING
5VSTBY FALLING
25 50 75 100 125
TJ (°C)
LDO Line Regulation vs.
Junction Temperature
10
5VSTBY = 4.7V to 5.3V
9
8
7
6
5
4
3
2
1
0
0 25 50 75 100
TJ (°C)
125
© 2000 SEMTECH CORP.
5
652 MITCHELL ROAD NEWBURY PARK CA 91320

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