G5698 Datasheet, PDF (1/1 Pages) Global Mixed-mode Technology Inc – 1.2MHz, 1.2A Synchronous Step-Down Regulator

Global Mixed-mode Technology Inc.
G5698
1.2MHz, 1.2A Synchronous Step-Down Regulator
Features
„ High Efficiency: Up to 95%
„ Low Quiescent Current: Only 50µA During Op-
eration
„ Internal Soft Start Function
„ 1.2A Output Current
„ 2.5V to 6V Input Voltage Range
„ 1.2MHz 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 G5698 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 G5698 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 1.2MHz, 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
MARKING
OUTPUT
VOLTAGE
G5698ADJRE1U
5698A
Adjustable
For other output voltage, please contact us at [e-mail]
Note: RE: TDFN3X3-10
1: Bonding Code
U: Tape & Reel
TEMP.
RANGE
-40°C~ +85°C
PACKAGE
(Green)
TDFN3X3-10
Pin Configuration
Typical Application Circuit
G5698
EN 1
NC 2
VIN 3
GND 4
VFB 5
T he rma l
P ad
10 PGND
9 NC
8 NC
7 LX
6 NC
TDFN3X3-10
Note: Recomm end connectin g the Therma l
Pad to the GND or let it ke ep floa ti ng.
G5698
V _IN
5V
V IN
LX
C_IN
2.2µF
CER
EN
VFB
GND
R1
V _OUT = 0 .6 V • (1 +
)
R2
2. 2µ H
C_FB * (option )
R1
R2 80k
18 k
V _OUT
3 .3 V
1 .2 A
C_OUT
10 µF
CER
Ver: 0.3
Aug 30, 2010
TEL: [phone]
http://www.gmt.com.tw
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