AT1691 Datasheet, PDF (1/1 Pages) Global Mixed-mode Technology Inc – 1.5MHz, 1A High Efficiency Buck Converter

Global Mixed-mode Technology
AT1691
1.5MHz, 1A High Efficiency Buck Converter
Features
„ 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
„ Mobile Phones
„ Wireless and DSL modems
„ Power Supply for Portable Devices
General Description
The AT1691 provides complete control for a DC/DC
converter optimized for high-performance microproc-
essor applications. It is operated on current mode ar-
chitecture for excellent line and load transient re-
sponse. 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 AT1691 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.
Ordering Information
ORDER
NUMBER
AT1691RB1U
Note: RB: TDFN2X2-6
1: Bonding Code
U: Tape & Reel
MARKING
A161
OUTPUT
VOLTAGE (V)
Adjustable
TEMP.
RANGE
-40°C~ +85°C
PACKAGE
(Green)
TDFN2X2-6
Pin Configuration
Typical Application Circuit
AT1691
NC 1
EN 2
VIN 3
Thermal
Pad
6 FB
5 GND
4 LX
TDFN2X2-6
Note: Recommend connecting the Thermal Pad to
the Ground for excellent power dissipation.
2.2µH
V_IN
3
VIN
4
LX
5V
C_IN
4.7µF
(optional)
AT1691
C_FB
R1
2 _EN
6
FB
GND
5
R2*
R1
V_OUT = 0.6V × (1+
)
R2
*R2= 150K for stability consideration.
V_OUT
3.3V/1A
C_OUT
10µF
Ver: 0.2
Jun 21, 2012
TEL: [phone]
http://www.gmt.com.tw
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