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SC1109EVB Datasheet

  • SC1109EVB

  • SYNCHRONOUS PWM CONTROLLER WITH DUAL LOW DROPOUT REGULATOR C...

  • 17頁

  • SEMTECH   SEMTECH

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SYNCHRONOUS PWM CONTROLLER WITH
DUAL LOW DROPOUT REGULATOR
CONTROLLERS
PRELIMINARY - October 16, 2000
SC1109
DESCRIPTION
The SC1109 was designed for the latest high
speed motherboards. It combines a synchronous
voltage mode controller (switching section) with
two low-dropout linear regulator controllers. The
voltage mode controller provides the power
supply for the system AGTL bus. The 1.8V and
2.5V linear controllers power the Chipset and
clock circuitry.
The SC1109 switching section features lossless
current sensing and latched driver outputs for
enhanced noise immunity. It operates at a fixed
frequency of 200kHz, the output voltage is
internally fixed at 1.2V
The SC1109 linear sections are low dropout
regulators designed to track the 3.3V power
supply when it turns on or off.
FEATURES
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1.8V, 2.5V linear controllers
LDOs track input voltage within 200mV until
regulation
Integrated drivers
Power Good Signal
Soft Start
Lossless Current Sense
APPLICATIONS
Pentium III Motherboards
Triple power supplies
廬
ORDERING INFORMATION
Part Number
(1)
Package
Linear
Voltage
Temp.
Range (T
J
)
SC1109CSTR
SC1109EVB
SO-16
1.8V/2.5V 0擄 to 125擄C
Evaluation Board
TYPICAL APPLICATION CIRCUIT
12V IN
5V STBY
5V IN
C2
2x1500uF
C3
0.1uF
11
C5
0.1uF
4
C6
0.1uF
5
14
POWER GOOD
C9
0.1uF
12
13
15
16
Note:
(1) Only available in tape and reel packaging. A reel
contains 1000 devices.
C1
0.1uF
C4
0.1uF
3
10
9
7
Q2
C7
3x1500uF
R1 2.2
Q1
L1
4uH
1.2V 6A
+
U4
VCC
BCAP+
SC1109CS
STBY
BST
DH
BCAP-
SS/EN
PWRGD
VOSENSE
GATE2
LDOS2
PHASE
VTT
8
6
2
1
R2 2.2
+
C8
0.1uF
DL
GND
GATE1
LDOS1
3.3V IN
Q3
+
C10
330uF
2.5V
+
C11
330uF
+
C12
330uF
1.8V
Q4
Pentium is a registered trademark of Intel Corporation
1
漏 2000 SEMTECH CORP.
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com

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