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G5719 Datasheet, PDF (1/2 Pages) Global Mixed-mode Technology Inc – 1MHz, 2A Synchronous Step-Down Regulator | |||
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Global Mixed-mode Technology
G5719
1MHz, 2A Synchronous Step-Down Regulator
Features
 High Efficiency: Up to 95%
 Low Quiescent Current: Only 50µA During Op-
eration
 Internal Soft Start Function
 2A Output Current
 2.5V to 6V Input Voltage Range
 1MHz Switching Frequency
 No Schottky Diode Required
 100% Duty Cycle in Dropout Operation
 0.6V Reference Allows Low Output Voltages
 <1µA Shutdown Current
 Current Mode Operation for Excellent Line and
Load Transient Response
 Over Temperature Protected
 RoHS Compliant
Applications
 Cellular Telephones
 Personal Information Appliances
 Microprocessors and DSP Core Supplies
 Wireless and DSL Modems
 Digital Still and Video Cameras
 MP3 Players
 Portable Instruments
General Description
The G5719 is a high efficiency monolithic synchronous
buck regulator using a constant frequency, current
mode architecture. Supply current during operation is
only 50µA and drops to <1µA in shutdown. The 2.5V
to 6V input voltage range makes the G5719 ideally
suited for single Li-Ion battery-powered applications.
100% duty cycle provides low dropout operation, ex-
tending battery run time in portable systems. Switching
frequency is internally set at 1MHz, allowing the use of
small surface mount inductors and capacitors. The
internal synchronous switch increase efficiency and
eliminates the need for an external Schottky diode.
Built-in soft start function eliminates in-rush current
that could damage the system.
Ordering Information
ORDER
NUMBER
G5719TB1U
Note: TB: SOT-23-6
1: Bonding Code
U: Tape & Reel
MARKING
5719x
Pin Configuration
OUTPUT
VOLTAGE
Adjustable
TEMP.
RANGE
-40°C to +85°C
PACKAGE
(Green)
SOT-23-6
Typical Application Circuit
EN 1
G5719
6 VFB
GND 2
5 NC
LX 3
SOT-23-6
4 VIN
VIN
4~6V
G5719
4
VIN
3
LX
CIN
2.2µF
CER
1
EN
6
VFB
GND
R1
VOUT = 0.6V ⢠(1+ R2 )
2.2µH
CFB* (option)
R1
R2 82k
18k
VOUT
3.3V
2A
COUT
10µF
CER
Ver: 0.4
Oct 19, 2012
TEL: 886-3-5788833
http://www.gmt.com.tw
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