AT1362A/B
Preliminary Product Information
Synchronous Buck Converter
With Power Good Detector & LDO
Features
• Operation Voltage 2.5V~6.0V
• Oscillation frequency 1MHz
• Output Current Maximum 400mA（DC-DC
Converter）
• Built-In 400mA/LDO
• Power Good Indicator with Time Delay
Adjustable
• Built-In Current Limit
• Built-In UVLO
• Built-In Thermal ShutDown
General Description
The AT1362A/B provides complete control for
a
DC/DC
converter
optimized
for
high-performance microprocessor applications. It
consists of a synchronous step-down DC/DC
converter and a high-speed LDO regulator
connected in series with the DC/DC converter
output. A power good detector and LDO ON/OFF
control is also built-in(metal option). DC/DC
converter is operated on current mode architecture
for excellent line and load transient response.
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 AT1362A/B is a family of low-noise
synchronous step-down DC/DC 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.
Applications
• Power Supply for Slim Type devices
Block Diagram
VBG
VBG
Vref
VREG
UVLO
VCC
Current
Sense
5
AGND
+
SLOPE
+
R
-
S
SW
Q
OSC
Vref
+
VCC
DELAY
Auto
Discharge
1uA
PG
UVLO
-
+
-
-
Shoot
Throught
BPC
PGND
0.7
R2
R1
OUT1
*OUT1=2.5V/1.8V
Metal Option
Current
Limit
R3
+
CTL
+
0.7V
-
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
5/30/2006
REV:1.0
Email:
service@aimtron.com.tw
1
AIMTRON [ AIMTRON TECHNOLOGY ]
