APW7136A/B/C
1MHz, High-Efficiency, Step-Up Converter for 2 to 8 White LEDs
Features
•
•
•
•
•
•
•
•
•
•
•
Wide Input Voltage from 2.7V to 6V
0.25V Reference Voltage
Fixed 1MHz Switching Frequency
High Efficiency up to 87%
100Hz to 100KHz PWM brightness control fre-
quency
Open-LED Protection
Under Voltage Lockout Protection
Over Temperature Protection
<1µA Quiescent Current during Shutdown
SOT-23-6 Package
Lead Free Available (RoHS Compliant)
General Description
The APW7136A/B/C is a current-mode and fixed frequency
boost converter with an integrated N-FET to drive up to 8
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 reduce 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 stop switching if
exceeds the over-voltage threshold. An internal soft-start
circuit eliminates the inrush current during start-up.
The APW 7136A/B/C also integrates under-voltage
lockout, over-temperature protection and current limit
circuits. The APW7136/A/B/C is available in a SOT-23-6
package.
Applications
•
•
•
•
White LED Display Backlighting
Cell Phone and Smart Phone
PDA, PMP, MP3
Digital Camera
Simplified Application Circuit
V
IN
C1
4.7µF
2
L1
22µH
6
VIN
GND
EN
LX
OVP
FB
1
5
3
R1
12Ω
C2
1µF
V
OUT
Pin Configuration
SOT-23-6 Top View
LX 1
GND 2
FB 3
6 VIN
5 OVP
4 EN
Up to 8
WLEDs
OFF ON
4
Ordering and Marking Information
APW7136
Lead Free Code
Handling Code
Temperature Range
Package Code
OVP Voltage Code
Y - OVP Voltage Code
X - Date Code
OVP Voltage Code
A: 20V
B: 28V
C: 35V
Package Code
C : SOT-23-6
Operating Ambient Temperature Range
I : -40 to 85
o
C
Handling Code
TR : Tape & Reel
Lead Free Code
L : Lead Free Device
APW7136YCI :
CFYX
Note: ANPEC lead-free products contain molding compounds/die attach materials and 100% matte tin plate termination finish; which are fully
compliant with RoHS and compatible with both SnPb and lead-free soldering operations. ANPEC lead-free products meet or exceed the lead-
free requirements of IPC/JEDEC J STD-020C for MSL classification at lead-free peak reflow temperature.
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 - Jan., 2008
1
www.anpec.com.tw
ANPEC [ ANPEC ELECTRONICS COROPRATION ]
