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參數資料
| 型號： | SC1401 |
| 廠商： | Semtech Corporation |
| 英文描述： | High Performance Synchronous Buck Controller with LDO for Portable Power(用于便攜式電源帶低壓差輸出的高性能同步步降控制器（1.25-5.5V可調輸出）) |
| 中文描述： | 高性能同步降壓控制器用于便攜式電源穩壓器（用于便攜式電源帶低壓差輸出的高性能同步步降控制器（1.25 - 5.5V的可調輸出）） |
| 文件頁數： | 1/17頁 |
| 文件大小： | 268K |
| 代理商： | SC1401 |
POWER MANAGEMENT
Description
The SC1401 is a synchronous buck regulator designed
to power the latest generation microprocessors in bat-
tery operated systems. The SC1401 may be used to
provide both the I/O and core voltages utilizing synchro-
nous rectification for the core supply voltage and an LDO
N-Channel MOSFET controller for the I/O supply voltage.
A 1.25 volt reference allows lower output voltages re-
quired by today’s portable microprocessors.
1
www.semtech.com
SC1401
High Performance Synchronous Buck
Controller with LDO for Portable Power
Features
!
>90% Efficiency (SMPS)
!
6.0V to 30V Input range
!
1.25V to 5.5V Adjustable output (SMPS)
!
PWM and LDO regulator outputs
!
High output gate drive of 2 Amps (SMPS)
!
Power save mode for light load operation
!
200kHz/300kHz fixed-frequency PWM operation
!
2mA Typical quiescent current
!
2μA Typical shutdown current
Applications
Revision 2, January 2001
Typical Application Circuit
!
Notebook and palmtop computers
!
LCD monitors
!
Internet appliances
The synchronous buck regulator is capable of achieving
efficiencies up to 95%. The gate drive circuitry can de-
liver 2.0A peak currents, allowing the use of N-channel
MOSFETs for lower switching and conduction losses.
A digital soft start is provided to ensure orderly start up
of the power supply without the need for external com-
ponents. At light load in power save mode, the controller
changes mode of operation by missing gate drive cycles,
thus reducing gate drive current and improving efficiency.
A logic high on PSAVE disables the power saving mode
thus reducing noise. The SC1401 is fabricated in a high
performance BiCMOS process. This process reduces the
power dissipation in low current and shutdown opera-
tion modes and improves efficiency.
The LDO controller is a high performance positive volt-
age regulator designed to provide a low noise power
source to the microprocessor peripherals by driving a low
cost external N-Channel MOSFET.
C16
D3
C15
C7
VO_LINEAR
C3
R6
SHDN
R2
RESET
U1
SC1401ISS
18
14
11
9
13
15
17
16
10
19
12
20
8
3
5
2
4
1
7
6
ENABLEIO
BST
PGND
DL
DH
VDD2
IOS
GATEIO
PGND
RESET
PHASE
PSAVE
V5V
FB
GND
SHDN
VDD1
SYNC
CSH
CSL
R5
C5
+5V
L1
C1
D2
VO_SMPS
PSAVE
VDD2
R1
C12
C13
C10
C14
Q2
R3
R7
C8
D1
Q1
C6
Q3
C9
C4
C2
SYNC
D4
C11
R4
ENABLE_IO
VIN
+5V
相關PDF資料 |
PDF描述 |
|---|---|
| SC1402 | Multi-Output, Low-Noise Power Supply Controller for Notebook Computers |
| SC1402ISS | Multi-Output, Low-Noise Power Supply Controller for Notebook Computers |
| SC1403ITSTRT | Mobile Multi-Output PWM Controller with Lossless Current Sense |
| SC1403 | Mobile Multi-Output PWM Controller with Virtual Current SenseTM |
| SC1403ITSTR | Mobile Multi-Output PWM Controller with Virtual Current SenseTM |
相關代理商/技術參數 |
參數描述 |
|---|---|
| SC1401ISS | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:HIGH PERFORMANCE SYNCHRONOUS BUCK CONTROLLER WITH LDO FOR PORTABLE POWER |
| SC1402 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Multi-Output, Low-Noise Power Supply Controller for Notebook Computers |
| SC1402ISS | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Multi-Output, Low-Noise Power Supply Controller for Notebook Computers |
| SC1403 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Mobile Multi-Output PWM Controller with Virtual Current SenseTM |
| SC1403_04 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Mobile Multi-Output PWM Controller with Lossless Current Sense |
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