APW7207
1MHz, High-Efficiency, Step-Up Converter for 2 to 6 White LEDs
Features
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Wide Input Voltage from 2.5V to 6V
0.2V Reference Voltage
Fixed 1MHz Switching Frequency
High Efficiency up to 88%
100Hz to 100kHz PWM Brightness Control Fre-
quency
Open-LED Protection
Under-Voltage Lockout Protection
Over-Temperature Protection
<1µA Quiescent Current During Shutdown
TSOT-23-6A Packages
Lead Free and Green Devices Available
(RoHS Compliant)
General Description
The APW7207 is a current-mode and fixed frequency
boost converter with an integrated N-FET to drive up to 6
white LEDs in series.
The series connection allows the LED current to be iden-
tical for uniform brightness. Its low on-resistance of N-
FET and feedback voltage reduces power loss and
achieves high efficiency. Fast 1MHz current-mode PWM
operation is available for input and output capacitors and
a small inductor while minimizing ripple on the input
supply. The OVP pin monitors the output voltage and stops
switching if exceeds the over-voltage threshold. An inter-
nal soft-start circuit eliminates the inrush current during
start-up.
The APW7207 also integrates under-voltage lockout,
over-temperature protection, and current limit circuits.
The APW7207 is available in TSOT-23-6A packages.
Applications
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White LED Display Backlighting
Pin Configuration
LX 1
6 VIN
5 OVP
4 EN
Cell Phone and Smart Phone
PDA, PMP, and MP3
Digital Camera
GND 2
FB 3
TSOT-23-6A
(Top View)
Simplified Application Circuit
V
IN
C1
2.2µF
2
4
L1
22µH
6
VIN
GND
EN
LX
OVP
FB
1
5
3
R1
10Ω
C2
1µF
V
OUT
Up to 6
WLEDs
OFF ON
ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and
advise customers to obtain the latest version of relevant information to verify before placing orders.
Copyright
©
ANPEC Electronics Corp.
Rev. A.2 - Dec., 2009
1
www.anpec.com.tw
ANPEC [ ANPEC ELECTRONICS COROPRATION ]
