AT1367A/B/C/D
Preliminary Product Information
1MHz, 800mA Synchronous Buck Converter
With Power Good Detector & LDO
Features
General Description
• Operation Voltage 2.5V~6.0V
The AT1367A/B/C/D provides complete
• Oscillation frequency 1MHz
control for a DC/DC converter optimized for
• Output Current Maximum 800mA（DC-DC
hight-performance microprocessor applications. It
Converter）
consists of a synchronous step-down DC/DC
• Built-In 400mA/LDO
converter and a high-speed LDO regulator
• Power Good Indicator with Time Delay
connected in series with the DC/DC converter
Adjustable
output. A power good detector and LDO ON/OFF
• Built-In Current Limit
control is also built-in(metal option). DC/DC
• Built-In UVLO
converter is operated on current mode architecture
• Built-In Thermal ShutDown
for excellent line and load transient response.
• Built-In LDO ON/OFF Control（Metal
Option）
1MHz 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 AT1367A/B/C/D is a family of
Applications
low-noise
synchronous
step-down
DC/DC
• Power Supply for Slim Type devices
converters that is ideally suited for systems
powered form 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.
Block Diagram
VBG
VBG
Vref
VREG
UVLO
VCC
Current
Sense
5
AGND
+
SLOPE
+
R
-
S
SW
Q
OSC
CTL
Control
LDO
R5
DELAY
Auto
Discharge
*CTL and /PG
Metal Option
PG
UVLO
/PG
-
CTL
Vref
+
VCC
0.9 x
Vref
0.35uA
-
Shoot
Throught
PGND
R2
R1
OUT1
Current
Limit
R3
+
CTL
+
Vref
-
*OUT2=2.5V/1.8V
Metal Option
Vref
R4
OUT2
Aimtron reserves the right without notice to change this circuitry and specifications.
7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW:
http://www.aimtron.com.tw
3/2/2006 REV:1.2
Email:
service@aimtron.com.tw
1
AIMTRON [ AIMTRON TECHNOLOGY ]
