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AIC1648 Fiches technique(PDF) 1 Page - Analog Intergrations Corporation

No de pièce AIC1648
Description  Built-in OVP White LED Step-Up Converter
Download  10 Pages
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Fabricant  AIC [Analog Intergrations Corporation]
Site Internet  http://www.analog.com.tw
Logo AIC - Analog Intergrations Corporation

AIC1648 Fiches technique(HTML) 1 Page - Analog Intergrations Corporation

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AIC1648
Built-in OVP White LED Step-Up Converter
Analog Integrations Corporation
Si-Soft Research Center
DS-1648P-03 010405
3A1, No.1, Li-Hsin Rd. I, Science Park, Hsinchu 300, Taiwan, R.O.C.
FEATURES
Built-In Open Circuit Protection
Over Voltage Protection
Efficiency Up to 84% at VIN=4.2V, 3LEDs,
ILED=20mA
1.2MHz Fixed Switching Frequency
Drives Up to 5LEDs in series
Low Supply Current: 70
µA
Matches LED Current
Requires Tiny Inductor and Capacitors
Tiny SOT-23-6 Package
APPLICATIONS
Cellular Phones
PDAs
DSCs
Handheld Devices
White LED Display Backlighting
DESCRIPTION
AIC1648 is a fixed frequency 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. Low 95mV
feedback voltage minimizes power loss in the
current setting resistor for better efficiency.
AIC1648 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.
AIC1648 is available in a space-saving, 6-lead
SOT-23-6 package.
TYPICAL APPLICATION CIRCUIT
L
6.8
µH
D1
SW
VIN
OVP
SHDN
FB
GND
AIC1648
3.3~4.2V
RFB
4.7
C1
1
µF
C2
1
µF
20mA
L1: 976AS-6R8M/D321F, TOKO
D1: RB521S-30, ROHM
C1: JMK107BJ105KA, TAIYO YUDEN
C2: EMK212BJ105KA, TAIYO YUDEN
LED Current (mA)
05
10
15
20
60
65
70
75
80
85
90
VIN=3.6V
VIN=4.2V
VIN=3.0V
3 LEDs, 6.8
µH
L1: 976AS-6R8M, TOKO
D1: RB521S-30, ROHM
Fig. 1 Li-Ion Powered Driver for Three White LEDs
TEL: 886-3-5772500
FAX: 886-3-5772510
www.analog.com.tw
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