AX2201 Datasheet PDF - AXElite

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AX2201
AXElite

Part Number AX2201
Description PWM Step-Down Controller
Page 11 Pages


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AX2201
PWM Step-Down Controller
GENERAL DESCRIPTION
The AX2201 integrates Pulse-Width-Modulation (PWM) control circuit into a single
chip. These devise include a reference voltage source, oscillation circuit, error amplifier and
etc.
AX2201 provides low-ripple power, high efficiency, and excellent transient
characteristics. The PWM control circuit is able to the duty ratio linearly form 0 up to 100%.
An enable function, an over current protect function and short circuit protect function are
built inside, and when OCP or SCP happens, the operation frequency will be reduced. Also,
an internal compensation block is built in to minimum external component count.
With the addition of an external P-channel Power MOS, a coil, capacitors, and a
diode connected externally, these components can function as step-down switching
regulators. They serve as ideal power supply units for portable devices when coupled with
the SOP-8L and MSOP-8L mini-package, providing such outstanding features as low
current consumption. Since this converter can accommodate an input voltage up to 24V, it
is also suitable for the operation via an AC adapter.
FEATURES
- Input voltage3.6V to 23V
- Output voltage0.25V to VCC
- LED backlight and high Power LED application
- Duty ratio0% to 100% PWM control
- Oscillation frequency330KHz.
- Current Limit (CL), Enable function.
- Thermal Shutdown function.
- Short Circuit Protect (SCP).
- External SW P-channel MOS.
- Low ESR output capacitor (Multi-layer chip capacitor (MLCC)) application.
- MSOP-8L and SOP-8L Pb-Free packages.
1/11



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AX2201
BLOCK DIAGRAM
LX
GATE
Thermal
Shutdown
Vcc
Oscillation
Circuit
Reference Voltage
PWM - Switched
Control Circuit
+
-
VEN
FB
Vss
EN COMP
PIN ASSIGNMET
These packages of AX2201 are MSOP-8L and SOP-8L; the pin assignment is given by:
EN 1
Comp 2
NC 3
Vcc 4
( Top View )
8 FB
7 Vss
6 LX
5 GATE
MSOP - 8L and SOP - 8L
Name
FB
EN
Comp
NC
VCC
GATE
LX
VSS
Description
Feedback pin
Shutdown Control Input.
Hnormal operation(Step-down)
LShutdown mode
Compensation pin
No connecting Pin
IC power supply pin
Gate drive for external P-channel
MOSFET.
LX is the current sense input.
GND pin
ORDER/MARKING INFORMATION
Order Information
AX2201 XX X
Package Type
S: SOP-8L
U8:MSOP-8L
Packing
Blank : Tube
A : Taping
Top Marking
AXLogo
2 2 0 1 Part number
Y Y W W X ID code:internal
WW:01~52
Year: 10=2010
11=2011
2/11
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.0 Jul.07, 2010



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AX2201
ABSOLUTE MAXIMUM RATINGS (at TA = 25°C)
Characteristics
Symbol
Rating
Unit
VCC Pin Voltage
VCC VSS - 0.3 to VSS + 25 V
Feedback Pin Voltage
VFB
VSS - 0.3 to VCC
V
ON/OFF Pin Voltage
VEN VSS - 0.3 to VCC + 0.3 V
Switch Pin Voltage
VSW VSS - 0.3 to VCC + 0.3 V
Power Dissipation
PD Internally limited mW
Storage Temperature Range
TST
-40 to +150
°C
Operating Temperature Range
TOP
-20 to +125
°C
Operating Supply Voltage
VOP
+3.6 to +23
V
Thermal Resistance from Junction to case
SOP-8L
MSOP-8L
θJC
35
45
°C/W
Thermal Resistance from Junction to SOP-8L
ambient
MSOP-8L
θJA
120
200
°C/W
Note : θJA is measured with the PCB copper area of approximately 1 in2(Multi-layer).
ELECTRICAL CHARACTERISTICS (VCC = 12V, TA = 25°C, unless otherwise specified)
Characteristics
Symbol
Conditions
Min Typ Max Units
Feedback Voltage
Quiescent Current
Feedback Bias Current
Shutdown Supply Current
VFB IOUT=0.1A
0.24 0.25 0.26 V
ICCQ VFB=1.2V force driver off
3 5 mA
IFB IOUT=0.1A
- 0.1 0.5 uA
ISD VEN =0V
- 2 10 uA
Line Regulation
VOUT/VOUT VCC = 5V~23V,
IOUT=0.2A
-12 %
Load Regulation
VOUT/VOUT IOUT = 0.1 to 3A
- 0.2 0.5 %
Oscillation Frequency
EN Pin Logic input threshold
voltage
FOSC1
VSH
VSL
SW pin
High (regulator ON)
Low (regulator OFF)
260 330 400 KHz
2.0 - -
- - 0.8
V
EN Pin Input Current
ISH VEN=2.5V (ON)
ISL VEN=0.3V (OFF)
- 20 - uA
- -10 - uA
LX Rise Time
LX Fall Time
TLXR CLX=1000pF
TLXF CLX=1000pF
- 80 -
- 80 -
nS
Efficiency (PMOS=AP9435M)
EFFI
VOUT = 5V
IOUT = 2A - 92 -
IOUT = 3A - 91 -
%
Thermal shutdown Temp
TSD
- 140 -
°C
3/11
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.0 Jul.07, 2010



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APPLICATION CIRCUIT
A. 1W/3W LED*1 for DC Input
AX2201
LED
1W LED*1
3W LED*1
1W+1W LED
3W+3W LED
1W+1W+1W LED
3W+3W+3W LED
Recommend Operating Conditions
ILED
R2
VCC Range
Inductor
(L1)
350m 0.715/0.125W 5~23V
22uH
750m 0.333/0.25W 5~23V
22uH
900m 0.278/0.5W 5~23V
22uH
350m 0.715/0.125W 10~23V 15uH
750m 0.333/0.25W 10~23V 15uH
900m 0.278/0.5W 10~23V 15uH
350m 0.715/0.125W 14~23V 10uH
750m 0.333/0.25W 14~23V 10uH
900m 0.278/0.5W 14~23V 10uH
Input Capacitor
(C3)
10uF(MLCC)
100uF(EL)
22uF(MLCC)
100uF(EL)
22uF(MLCC)
100uF(EL)
10uF(MLCC)
100uF(EL)
22uF(MLCC)
100uF(EL)
22uF(MLCC)
100uF(EL)
10uF(MLCC)
100uF(EL)
22uF(MLCC)
100uF(EL)
22uF(MLCC)
100uF(EL)
4/11
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.0 Jul.07, 2010



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