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參數(shù)資料
| 型號(hào)： | SC1173CSW |
| 廠商： | Semtech Corporation |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Cap-Free, NMOS, 150mA Low Dropout Regulator with Reverse Current Protection |
| 中文描述： | 無(wú)電容，NMOS管，150mA的低壓差穩(wěn)壓器的反向電流保護(hù) |
| 文件頁(yè)數(shù)： | 1/12頁(yè) |
| 文件大小： | 119K |
| 代理商： | SC1173CSW |
PROGRAMMABLE SYNCHRONOUS DC/DC
CONVERTER WITH LOW DROPOUT
REGULATOR CONTROLLER
SC1172/3
1999 SEMTECH CORP.
October 25, 1999
652 MITCHELL ROAD NEWBURY PARK CA 91320
1
ORDERING INFORMATION
DESCRIPTION
The SC1172/3 combines a synchronous voltage mode
controller with a low-dropout linear regulator providing
most of the circuitry necessary to implement two DC/DC
converters for powering advanced microprocessors such
as Pentium
II (Klamath) or Deschutes.
The SC1172/3 switching section features an integrated 5
bit D/A converter, pulse by pulse current limiting,
integrated power good signaling, and logic compatible
shutdown. The SC1172/3 switching section operates at
a fixed frequency of 200kHz, providing an optimum
compromise between size, efficiency and cost in the
intended application areas. The integrated D/A con-
verter provides programmability of output voltage from
2.0V to 3.5V in 100mV increments and 1.30V to 2.05V
in 50mV increments with no external components.
The SC1172/3 linear section is a high performance
positive voltage regulator design for either the GTL bus
supply at 1.5V (SC1172) or an adjustable output
(SC1173).
The output of the linear regulator can provide up to 5A or
more with the appropriate external MOSFET.
Pentium is a registered trademark of Intel Corporation
PIN CONFIGURATION
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
BLOCK DIAGRAM
FEATURES
Synchronous design, enables no heatsink solution
95% efficiency (switching section)
5 bit DAC for output programmability
On chip power good function
Designed for Intel Pentium
II VRM8.1 require-
ments
1.5V or Adj. @ 1% for linear section
APPLICATIONS
Pentium
ll or Deschutes microprocessor supplies
Flexible motherboards
1.3V to 3.5V microprocessor supplies
Programmable dual power supplies
Part Number
(1)
Package
Linear
Voltage
1.5V
Temp.
Range (T
J
)
0° to 125°C
SC1172CSW
SO-24
SC1173CSW
SO-24
Adj.
0° to 125°C
Note:
(1) Add suffix ‘TR’ for tape and reel.
Top View
(24 Pin SOIC)
NC
NC
AGND
OVP
VCC
LDOS
CS-
CS+
PWRGOOD
PGNDL
DH
PGNDH
LDOV
VID0
VID1
GATE
VID3
VID4
VID2
VOSENSE
EN
BSTH
DL
BSTL
2
3
4
1
6
7
5
8
9
10
12
11
23
22
21
24
19
18
20
17
16
15
13
14
LDOV
GATE
LDOS
PGNDL
DL
BSTL
PGNDH
DH
BSTH
EN
VCC
CS+
CS-
VID3
VID2
VID1
VID4
VID0
VOSENSE
PWRGOOD
OVP
VCC
70mV
CURRENT LIMIT
1.25 REF
D/A &
DOWN
LEVEL SHIFT
AND HIGH SIDE
MOSFET DRIVE
OSCILLATOR
R
S
Q
THRU
CONTROL
SYNCHRONOUS
ERROR
AMP
AGND
FET
1.25V
REF
OPEN
COLLECTORS
VCC
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