Si9177 Datasheet, PDF (3/9 Pages) Vishay Siliconix – 200-mA PSM Step Down Converter with Bypass Capability

New Product
Si9177
Vishay Siliconix
PIN CONFIGURATION
V_IN
1
V_IN
2
ENABLE 3
BP/PSM 4
NC 5
V_IN
V_IN
ENABLE
BP/PSM
NC
MSOP-10
Top View
MLP33
10
L_X
9
L_X
8
GND
7
F_B
6
REF
10
L_X
2
9
L_X
3
8
GND
4
7
F_B
5
6
REF
ORDERING INFORMATION
Part Number Temperature Range
Package
Si9177BM-TI
Si9177BH-TI
- 25_C to 85_C
Tape and Reel
Eval Kit
Si9177DB
Temperature Range
- 25_C to 85_C
Board Type
Surface Mount
Top View
PIN DESCRIPTION
Pin No. Name
Function
1, 2
3
4
5
6
7
8
9, 10
V_IN
ENABLE
BP/PSM
NC
REF
F_B
GND
L_X
Input voltage source for buck converter, MOSFET driver, and IC control circuits.
Logic high enables the converter. Logic low shuts down the IC and decreases current consumed to <1 mA.
Logic high = Bypass mode, logic low = PSM mode.
No Connection
1.215-V reference.
Direct output voltage sense feedback
IC ground
Inductor connection node
TIMING WAVEFORMS
90%
V_OUT
10%
V_IN
t_DELAY = Start-Up Delay Time
t_SS = Soft-Start Time
Document Number: 70312
S-03663—Rev. B, 07-Apr-03
tDELAY
tSS
FIGURE 1. Soft-Start Timing
www.vishay.com
3