APW7215 Datasheet, PDF (1/17 Pages) Anpec Electronics Coropration – Fixed 600kHz Step-UP Converter for White LEDs

APW7215
Fixed 600kHz Step-UP Converter for White LEDs
Features
General Description
• Wide Input Voltage from 2.7V to 6V
• Fixed 600kHz Switching Frequency
• Reference Voltage : 0.2V
• PWM brightness control with wide frequency
range of 5KHz to 100KHz
• Build-in Power MOSFET: 0.3Ω
• Over-Voltage Protection
• Under Voltage Lockout Protection
• Over Temperature Protection
• <1µA Quiescent Current during Shutdown
• TDFN2x2-6 Package
• Halogen and Lead Free Available (RoHS
Compliant)
Applications
The APW7215 is a current-mode and fixed frequency
600kHz boost converter with an integrated N-FET to drive
white LEDs.
The series connection allows the LED current to be iden-
tical for uniform brightness. Its low on-resistance of NFET
and low feedback voltage reduce power loss and achieve
high efficiency. 600kHz Constant switching frequency al-
lows using small-size inductor and both of input and out-
put capacitors. An over voltage protection function, which
monitors the output voltage via LX pin, stops switching of
the IC if the LX voltage exceeds the over voltage threshold.
An internal soft-start circuit eliminates the inrush current
during start-up.
The APW7215 also integrates under-voltage lockout and
over-temperature protection to protect the IC in abnormal
conditions. The APW7215 is available in TDFN2x2-6
package.
• White LED Display Backlighting
• Cell Phone and Smart Phone
• PDA, PMP, MP3
• Digital Camera
Simplified Application Circuit
Pin Configuration
FB 1
NC 2
GND 3
6 VIN
5 EN
4 LX
APW7215
TDFN2x2-6
Top View
V_IN
C1
1µF
PWM Dimming
L1
22µ H
VIN
LX
GND
EN
FB
V_OUT
C2
1µ F
10 strings
R1
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 - Oct., 2012
www.anpec.com.tw