APW7207 Datasheet, PDF (1/16 Pages) Anpec Electronics Coropration – 1MHz, High-Efficiency, Step-Up Converter for 2 to 6 White LEDs

APW7207
1MHz, High-Efficiency, Step-Up Converter for 2 to 6 White LEDs
Features
General Description
• Wide Input Voltage from 2.5V to 6V
The APW7207 is a current-mode and fixed frequency
• 0.2V Reference Voltage
• Fixed 1MHz Switching 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-
• High Efficiency up to 88%
tical for uniform brightness. Its low on-resistance of N-
• 100Hz to 100kHz PWM Brightness Control Fre- ^{FET and feedback voltage reduces power loss and}
achieves high efficiency. Fast 1MHz current-mode PWM
quency
operation is available for input and output capacitors and
• Open-LED Protection
a small inductor while minimizing ripple on the input
• Under-Voltage Lockout Protection
• Over-Temperature Protection
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
• <1µA Quiescent Current During Shutdown
start-up.
• TSOT-23-6A Packages
• Lead Free and Green Devices Available
The APW7207 also integrates under-voltage lockout,
over-temperature protection, and current limit circuits.
The APW7207 is available in TSOT-23-6A packages.
(RoHS Compliant)
Applications
• White LED Display Backlighting
• Cell Phone and Smart Phone
• PDA, PMP, and MP3
• Digital Camera
Simplified Application Circuit
Pin Configuration
LX 1
GND 2
FB 3
6 VIN
5 OVP
4 EN
TSOT-23-6A
(Top View)
V_IN
C1
2.2µF
OFF ON
L1
22µH
6 _VIN
LX ¹
2
GND
OVP ⁵
4
EN
FB ³
V_OUT
C2
1µF _{Up to 6}
WLEDs
R1
10Ω
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.
1
Rev. A.2 - Dec., 2009
www.anpec.com.tw