AT1362 Datasheet, PDF (1/13 Pages) Aimtron Technology – 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
Applications
• Power Supply for Slim Type devices
AT1362A/B
Preliminary Product Information
Synchronous Buck Converter
With Power Good Detector & LDO
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.
Block Diagram
VBG
VBG
Vref
AGND
+
SLOPE
VREG
UVLO
Current
Sense
+
RQ
-
S
DELAY
PG
OSC
Auto
Discharge
VCC
Vref
+
-
Shoot
Throught
0.7
1uA
UVLO
-
+
R2
R1
*OUT1=2.5V/1.8V
Metal Option
-
CTL
+
0.7V
VCC
5
SW
BPC
Current
Limit
R3
+
R4
-
Vref
PGND
OUT1
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: [phone] Fax: [phone]
WWW: http://www.aimtron.com.tw
5/30/2006 REV:1.0
Email: [e-mail]
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