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參數資料
| 型號： | Si9177BM-TI |
| 廠商： | Vishay Intertechnology,Inc. |
| 英文描述： | 200-mA PSM Step Down Converter with Bypass Capability |
| 中文描述： | 200毫安掩模降壓轉換器與繞道能力 |
| 文件頁數： | 1/9頁 |
| 文件大小： | 104K |
| 代理商： | SI9177BM-TI |
Si9177
Vishay Siliconix
New Product
Document Number: 70312
S-03663—Rev. B, 07-Apr-03
www.vishay.com
1
200-mA PSM Step Down Converter with Bypass Capability
FEATURES
2.7-V to 6-V Input Voltage Range
1.2-V to 5-V Output
Efficiency of 95% for V
OUT
of 3.3 V @ 200-mA Load
Selectable Pulse Skipping Modulation (PSM) or
Bypass Mode (BP) Operation
150-m Bypass Switch for 800-mA Loads
Integrated MOSFET with Low External Part Count
Shutdown Current <1 A
Integrated UVLO and Power on Reset
Integrated Soft-Start
Over Temperature Protection
MLP33-10 or MSOP-10 Packages
APPLICATIONS
Cellular Phones, Cordless Phones
Computer Point of Use, Notebook
PDAs
Battery Powered Devices
MP3 Players
DESCRIPTION
The Si9177 is a dual-mode power adjustable output converter.
When it is set to PSM mode, the Si9177 operates as a
pulse-skipping-modulation controlled step-down (buck)
converter with an output voltage range of 1.2 V to 5 V. It has an
integrated MOSFET, capable of supplying 200-mA load
current with a 1.5- H inductor. The output voltage is adjusted
by a resistive divider on the F
B
pin. The typical conversion
efficiency is above 90%. A logic HIGH at the BP/PSM pin puts
Si9177 in bypass mode. The main PMOS buck switch is forced
to turn on at 100% duty cycle, overriding the F
B
signal. The
voltage differential between input and output is the resistive
voltage drop on the internal 150-m PMOS and the inductor.
The Si9177 delivers 800-mA load in bypass mode.
The Si9177 is available in the space saving MLP33-10 and
MSOP-10 packages. In order to satisfy the stringent ambient
temperature requirements, the Si9177 is rated to handle the
industrial temperature range of -25 C to 85 C.
TYPICAL APPLICATION CIRCUIT
V
IN
ON/OFF
ENABLE
BP/PSM
NC
SI9177
L
X
GND
F
B
REF
1
2
3
4
5
10
9
8
7
6
V
OUT
V
IN
BP/PSM
V
IN
L
X
C
IN
C
OUT
C
REF
1.5 H
R
1
R
2
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