G5177B Datasheet, PDF (1/1 Pages) Global Mixed-mode Technology Inc – Sync. Rectifier Step Up Converter

Global Mixed-mode Technology
G5177B
Sync. Rectifier Step Up Converter
Features
„ Up to 90% Efficiency at Iout=2A V_OUT = 5V from
3.3V Input
„ Low 70μA Quiescent Current
„ Guaranteed 3A Output Current at V_OUT = 5V
from 3.3V Input
„ 1MHz PWM Switching Frequency
„ Synchronous and Embedded Power Mosfets;
No Schottky Diode Required
„ Internal Soft-Start to Limit Inrush Current
„ Adjustable Output
„ Output turn off true shutdown function
„ Current Mode Operation with Internal Com-
pensation for Excellent Line and Load Tran-
sient Response
„ Overload/Short-Circuit Protection with hiccup
control
„ Shutdown Current <1µA
„ Thermal Shutdown
„ Compact 8 pin,SOP8 (FD) package
Application
„ iPad-like computers, smart phones and port-
able handheld devices.
Ordering Information
ORDER
NUMBER
G5177BF11U
Note: F1:SOP-8 (FD)
1: Bonding Code
U: Tape & Reel
Pin Configuration
MARKING
G5177B
General Description
The G5177B is a compact, high-efficiency, synchro-
nous step-up converter with power Mosfets embedded
and with output turn off true shutdown function and
adjustable output current limiting with foldback for a
single-cell Li-ion/polymer battery. The G5177B uses
only 70μA (typ) quiescent current and allows the con-
verter to switch only when needed at no load and light
loads, and when load is higher than 100mA, it uses
fixed-frequency PWM technique at 1MHz. It features a
current mode control for fast transient response with
internal compensation. The G5177B includes cy-
cle-by-cycle current limit to maximum inductor current
and over-temperature protection circuit. The G5177B
is suitable for iPad-like computers, smart phones and
portable handheld devices.
The G5177B is available in a SOP8 (FD) package. The
operating temperature range is from -45°C to +85°C.
TEMP.
RANGE
0°C to +85°C
PACKAGE
(Green)
SOP-8 (FD)
Typical Application Circuit
LX 1
LX 2
VBAT 3
G5177B
9 GND
Thermal
Pad
8 VOUT
7 VOUT
6 FB
ILM01 4
5 GND
SOP-8 (FD)
Note: Recommend connecting the Thermal Pad
to the Ground for excellent power dissipation.
CIN
47µF
1,2
LX
7,8
VOUT
3 _VBAT
4 _ILM01
FB ⁶
COUT
68µF ^R1
GND
R2
5
CC
CC:10pF~30pF
VOUT=VREF*(1+R1/R2), where VREF typical is 1.23V.
Ver: 0.1
Aug 05, 2013
TEL: [phone]
http://www.gmt.com.tw
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