G5671 Datasheet, PDF (1/1 Pages) Global Mixed-mode Technology Inc – 3A Synchronous Step-Down DC/DC

Global Mixed-mode Technology
G5671
3A Synchronous Step-Down DC/DC
Features
„ 3A Output Current
„ 75mΩ Internal Power MOSFET Switch
„ Stable with Low ESR Output Ceramic Capaci-
tors or POSCAPs
„ 85% Efficiency at 2.5A Output Current
(5V->1.8V)
„ Less Than 1µA Shutdown Current
„ 1MHz Switching Frequency
„ Power Good Opened Drain Output
„ Thermal Shutdown
„ Cycle-by-Cycle Over Current Protection
„ Output Adjustable from 0.6V to V_IN
„ Available in TDFN3X3-10 Package
Applications
„ NB
„ Distributed Power Systems
„ Pre-Regulator for Linear Regulators
General Description
The G5671 is a monolithic step-down switch mode
regulator with a built in internal power MOSFET. It
achieves a continuous output current at 1MHz switch-
ing frequency with excellent load and line regulation.
Current mode operation provides fast transient re-
sponse and eases of loop stabilization. Power good
function delivers power supply ready signal to the
load.
Fault condition protection includes cycle-by-cycle cur-
rent limiting, output short circuit protection and thermal
shutdown. In shutdown mode the regulator ground
current is controlled less than 1µA. An Internal
soft-start minimizes the inrush supply current at initial
startup.
The G5671 requires a minimum number of readily
available standard external components. It is available
in TDFN3X3-10 package.
Ordering Information
ORDER
NUMBER
G5671RE1U
Note: RE: TDFN3X3-10
1: Bonding Code
U: Tape & Reel
Pin Configuration
MARKING
5671
TEMP.
RANGE
-40°C to +85°C
PACKAGE
(Green)
TDFN3X3-10
Typical Application Circuit
NC 1
SW 2
SW 3
POK 4
EN 5
G5671
Thermal
Pad
(GND)
10 VIN
9 VIN
8 VCC
7 NC
6 FB
TDFN3X3-10
Note: Recommend connecting the Thermal Pad
to the Ground for excellent power dissipation.
VIN
10µF
10Ω
0.1µF
OFF _ON
G5671
VIN
SW
VCC
FB
EN
POK
PGD GND
2.2µH
R1
40kΩ
VOUT
1.8V/3A
22µF
R2
20kΩ
10kΩ
VIN
Ver: 0.4
May 27, 2013
TEL: [phone]
http://www.gmt.com.tw
1