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AIC3643 Datasheet Preview

AIC3643 Datasheet

Built-in OVP White LED Step-Up Converter

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AIC3643
Built-in OVP White LED Step-Up Converter
FEATURES
Built-In Open Circuit Protection
Over Voltage Protection
Efficiency Up to 83% at VIN=4.2V, 3LEDs,
ILED=20mA
1.2MHz Fixed Switching Frequency
Drives Up to 5LEDs in series
2.5V to 5.5V Input Voltage
Low Supply Current: 150μA
Matches LED Current
Requires Tiny Inductor and Capacitors
TSOT-23-6, and SOT-23-6 Packages
APPLICATIONS
Cellular Phones
PDAs
DSCs
Handheld Devices
White LED Display Backlighting
DESCRIPTION
AIC3643 is a current-mode pulse-width-
modulation (PWM), step-up DC/DC converter
designed to drive white LEDs with a constant
current to provide backlight in hand-held devices.
Series connection of LEDs provides identical
LED currents resulting in uniform brightness.
This configuration eliminates the need of ballast
resistors. The built-in open load protection
prevents the damage resulting from an open
circuit condition. Also low 100mV feedback
voltage minimizes power loss in the current
setting resistor for better efficiency.
AIC3643 is a step-up PWM converter, which
includes an internal N-channel MOSFET switch
for high efficiency. The high switching frequency,
1.2MHz, allows the use of tiny external
components.
AIC3643 is available in a space-saving TSOT-
23-6, and SOT-23-6 packages.
TYPICAL APPLICATION CIRCUIT
3.0~4.2V L D1
6.8μH
C1
1μF VIN SW
SHDN OVP
GND FB
AIC3643
L1: GTSD31-6R8M, GOTREND
D1: SS0540, PAN JIT
C1: JMK107BJ105KA, TAIYO YUDEN
C2: GRM21BR61C335K, MURATA
www.DataSheet4U.com
90
C2
3.3μF
85
80
20mA
RFB
5Ω
75
70
65
60
0
VIN=4.2V
VIN=3.6V
VIN=3V
3 LEDs, 6.8μH
L1: GTSD31-6R8M, GOTREND
D1: SS0540, PAN JIT
Test Circuit refer to Fig.1
5 10 15 20 25 30
LED Current (mA)
Fig. 1 Li-Ion Powered Driver for Three White LEDs
Analog Integrations Corporation
Si-Soft Research Center
3A1, No.1, Li-Hsin Rd. I, Science Park, Hsinchu 300, Taiwan, R.O.C.
TEL: 886-3-5772500
FAX: 886-3-5772510 www.analog.com.tw
DS-3643G-01 20090820
1




Analog Integrations

AIC3643 Datasheet Preview

AIC3643 Datasheet

Built-in OVP White LED Step-Up Converter

No Preview Available !

AIC3643
ORDERING INFORMATION
AIC3643XXX XX
PACKING TYPE
TR: TAPE & REEL
BG: BAG
PACKAGE TYPE
G6: SOT-23-6
K6: TSOT-23-6
G: Green Package
Example:
AIC3643GG6TR
in SOT-23-6 Green Package &
Tape & Reel Packing Type
PIN CONFIGURATION
SOT-23-6
TSOT-23-6
FRONT VIEW
VIN
6
OVP SHDN
54
3643G/3643K
12 3
SW GND FB
Note: Pin1 is determined by orienting
the package marking as shown.
Marking
Part No.
AIC3643GG6
AIC3643GK6
Marking
3643G
3643K
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2


Part Number AIC3643
Description Built-in OVP White LED Step-Up Converter
Maker Analog Integrations
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