G5691

G5691
Global Mixed-mode Technology
1.5MHz, 1A High Efficiency Buck Converter
General Description
Features
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The G5691 provides complete control for a DC/DC
converter optimized for high-performance microprocessor applications. It is operated on current mode architecture for excellent line and load transient response. 1.5MHz operation frequency is allowing the
use of small surface mount inductor and capacitor.
The internal synchronous switch increases efficiency
and eliminates the need for an external Schottky diode.
The G5691 is a family of low-noise synchronous
step-down DC/DC converters that is ideally suited for
systems powered from a 1-cell Li-ion battery or from a
3-cell to 4-cell NiCd, NiMH, or alkaline battery. It can
also be used to USB-Based power system.
Input voltage: 2.5V ~5.5V
High efficiency (95%)
No Schottky Diode Required
1A Output Current at 5V Input 3.3V Output
1.5MHz Switching Frequency
Built-in ON/OFF Function
Low Dropout Operation: 100% Duty Cycle
Thermal Protection
Tiny 6-Lead TDFN2X2 Package
RoHS Compliant
Applications
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Mobile Phones
Wireless and DSL modems
Power Supply for Portable Devices
Ordering Information
ORDER
NUMBER
MARKING
OUTPUT
VOLTAGE (V)
TEMP.
RANGE
PACKAGE
(Green)
G5691RB1U
5691
Adjustable
-40°C~ +85°C
TDFN2X2-6
G5691-12RB1U
5691A
1.2
-40°C~ +85°C
TDFN2X2-6
G5691-33RB1U
5691E
3.3
-40°C~ +85°C
TDFN2X2-6
Note: RB: TDFN2X2-6
1: Bonding Code
U: Tape & Reel
Pin Configuration
Typical Application Circuit
NC
1
EN
2
VIN
3
Thermal
Pad
3
VIN
5V
G5691
6
FB
5
GND
4
LX
LX
VIN
2
EN
2.2µH
(optional)
CFB
G5691
CIN
4.7µF
4
FB
VOUT
3.3V/1A
R1
COUT
10µF
6
GND
5
TDFN2X2-6
VOUT = 0.6V × (1+
Note: Recommend connecting the Thermal Pad to
the Ground for excellent power dissipation.
R1
R2
R2*
)
*R2= 150K for stability consideration.
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 0.9
Jun 21, 2012
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