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AP3127B Datasheet Preview

AP3127B Datasheet

Step-Up DC/DC Converter

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AP3127B
Chipown
Step-Up DC/DC Converter
Series White LED Backlight Driver
General Description
The AP3127B Series is a fixed frequency, constant
current step-up DC/DC converter ideal for driving LEDs
used in backlighting applications on cellular phones,
PDAs and digital cameras etc. Output voltage of up to
23V can be derived, and from a 3.2V input six white
LED’s can be driven in series or alternatively, using a
2.5V input, a network of two parallel legs with three in
each may be driven.
Luminance of the LED’s is controlled by changing the
duty cycle of a PWM signal applied to the CE pin.
In addition, an internal MOSFET with an Rds(on) of
0.8is used. Allow profile and small board area solution
can be achieved using a chip coil and an ultra small
ceramic output capacitor (CL) of 0.22uF.
Applications
z For White LED Drivers
z Mobil phones, PHS
z PDAsGPSs
z Digital still cameras
Features
z Input voltage range : 2.5V-6V
z Output voltage range : up to 23V externally set-up
reference voltage 0.25V  
z Oscillation frequency : 1.0MHz 
z On resistance : 0.8
z Efficiency : 88%(When driving 3 white LEDs in
series Vin=3.6V ILED=20mA)
z Control : PWM control
z Stand-by Current : ISTB=1.0uA
z Load capacitor : 0.22uF,ceramic
z Lx limit Current :1.0A
Package
S0T-23-6L
Typical Application Circuit
Figure 1. Basic Application Circuit with AP3127B
1/6




Chipown

AP3127B Datasheet Preview

AP3127B Datasheet

Step-Up DC/DC Converter

No Preview Available !

AP3127B
Pin Description
Pin No. Pin Name
1 LX
2 VSS
3 FB
4 CE
5 OVP
6 VIN
Functional Block Diagram
Pin Function
Switch
Ground
Voltage Feedback
Chip Enable
Over voltage protect
Power Input
Chipown
Figure 2. AP3127B Block Diagram
Absolute Maximum Ratings
VIN Pin Voltage…………………………………………………………………………………………Vss-0.3Vss+7V
OUT Pin Voltage…………………………………………………………………………………….....Vss-0.3Vss+28V
LX Pin Voltage ………………………………………………………………………………………..Vss-0.3Vss+28V
FB Pin Voltage…………………………………………………………………………………………. Vss-0.3Vss+7V
CE Pin Voltage ……………………………………………………………………………….................Vss-0.3Vss+7V
OVP Pin Voltage ………………………………………………………………………………………Vss-0.3Vss+28V
LX Pin Current…………………………………………………………………………………………………….1300mA
Power Dissipation………………………………………………………………………………………………….250mW
Operating Temperature range…………………………………………………………………………………-40~+85
Storage Temperature range………………………………………………………………………………….-55~+125
Lead Temperature (Soldering, 10s) ………………………………………………………………………………….260
Caution The absolute maximum ratings are rated values exceeding which the product could suffer physical damage.
These values must therefore not be exceeded under any conditions.
8/F, ChuangYuan Building No.21-1 Changjiang Road, Wuxi New District Tel: +86(510)8521-7718 http://www.chipown.com.cn
V2.0
2/6


Part Number AP3127B
Description Step-Up DC/DC Converter
Maker Chipown
Total Page 6 Pages
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