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AX3531 Datasheet Preview

AX3531 Datasheet

2A Synchronous Step-Down Converter

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AX3531
1.25MHz, 2A Synchronous Step-Down
Converter
GENERAL DESCRIPTION
AX3531 is a high efficiency monolithic synchronous buck regulator using a constant
frequency, current mode architecture. The device is available in an adjustable version.
Supply current with no load is 200uA and drops to <1uA in shutdown. The 2.8V to 5.5V input
voltage range makes AX3531 ideally suited for single Li-Ion, two to three AA
battery-powered applications. 100% duty cycle provides low dropout operation, extending
battery life in portable systems. Switching frequency is internally set at 1.25MHz, allowing
the use of small surface mount inductors and capacitors. The internal synchronous switch
increases efficiency and decreases need of an external schottky diode. Low output voltages
are easily supported with the 0.6V feedback reference voltage. AX3531 is available in small
TSOT-23-6L package.
FEATURES
- 2.8V to 5.5V Input Voltage Range
- Output Voltage from 0.6V to VIN
- High Efficiency: Up to 96%
- 1.25MHz Constant Frequency Operation
- Up to 2A Output Current
- Quiescent Current: 200uA (Typical)
- No Schottky Diode Required
- Current Mode Operation for Excellent Line and Load Transient Response
- Current limit, Enable function
- Short Circuit Protect (SCP)
- Build in soft start function
- 1µA Shutdown Current
- TSOT-23-6L Pb-Free package
1/10
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.0 Jul.22, 2011




AXElite

AX3531 Datasheet Preview

AX3531 Datasheet

2A Synchronous Step-Down Converter

No Preview Available !

AX3531
BLOCK DIAGRAM
VIN
REF
0.6V
Soft-Star
+
FB -
OSC
-
+Icomp
SLOPE
COMP
SET
Isense
AMP
RESET
PWM
LOGIC
NON-OVERLAP
CONTROL
Over-Temperature and
Short-Circuit Protection
Enable Logic
SW
GND
EN
PIN ASSIGNMENT
The package of AX3531 is TSOT-23-6L; the pin assignment is given by:
Name
Description
FB GND VIN
Enable pin
654
EN Hnormal operation
LShut own
(Top View)
VIN Power Supply Input Pin
TSOT-23-6L
123
Switch output pin. Connect
SW
external inductor here. Minimize
trace area at this pin to reduce
EMI.
EN GND SW
GND Ground Pin
FB Output Feedback pin
ORDER/MARKING INFORMATION
Order Information
Top Marking (TSOT-23-6L)
AX3531 XX X
Package Type Packing
CT: TSOT-23-6L Blank : Bag
A : Taping
GG Y W X
AX3531
ID code: internal
WW: 01~26(A~Z)
27~52(a~z)
Year: A=2010
1=2011
2/10
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.0 Jul.22, 2011


Part Number AX3531
Description 2A Synchronous Step-Down Converter
Maker AXElite
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