APW7207_12 Datasheet, PDF (1/18 Pages) Anpec Electronics Coropration – 1MHz, High-Efficiency, Step-Up Converter for White LEDs

APW7207/A
1MHz, High-Efficiency, Step-Up Converter for White LEDs
Features
General Description
• Wide Input Voltage from 2.5V to 6V
The APW7207/A 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 10
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 200kHz 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 and TDFN2x2-8 Packages
• Lead Free and Green Devices Available
The APW7207/A also integrates under-voltage lockout,
over-temperature protection, and current limit circuits.
The APW7207/A is available in TSOT-23-6A and TDFN2x2-
(RoHS Compliant)
8 packages.
Applications
Pin Configuration
• White LED Display Backlighting
• Cell Phone and Smart Phone
• PDA, PMP, and MP3
• Digital Camera
Simplified Application Circuit
V_IN
C1
2.2µF
OFF ON
L1
22µH
VIN
LX
GND OVP
EN
FB
V_OUT
C2
1µF ^{Up tp 10}
WLEDs
R1
10Ω
LX 1
GND 2
FB 3
6 VIN
5 OVP
4 EN
TSOT-23-6A
(Top View)
GND 1
VIN 2
OVP 3
EN 4
8 LX
7 NC
6 GND
5 FB
TDFN 2x2-8
Top View
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.7 - Nov., 2012
www.anpec.com.tw