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AIC1648
Built-in OVP White LED Step-Up Converter
Analog Integrations Corporation
Si-Soft Research Center
3A1, No.1, Li-Hsin Rd. I, Science Park, Hsinchu 300, Taiwan, R.O.C.
DS-1648P-03 010405
z
Built-In Open Circuit Protection
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Over Voltage Protection
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Efficiency Up to 84% at V
IN
=4.2V, 3LEDs,
I
LED
=20mA
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1.2MHz Fixed Switching Frequency
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Drives Up to 5LEDs in series
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Low Supply Current: 70
μ
A
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Matches LED Current
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Requires Tiny Inductor and Capacitors
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Tiny SOT-23-6 Package
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Cellular Phones
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PDAs
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DSCs
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Handheld Devices
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White LED Display Backlighting
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.
L
6.8
μ
H
D1
SW
VIN
OVP
SHDN
FB
GND
AIC1648
3.3~4.2V
R
FB
4.7
C1
1
μ
F
C2
1
μ
F
20mA
L1: 976AS-6R8M/D321F, TOKO
D1: RB521S-30, ROHM
C1: JMK107BJ105KA, TAIYO YUDEN
C2: EMK212BJ105KA, TAIYO YUDEN
LED Current (mA)
E
0
5
10
15
20
60
65
70
75
80
85
90
V
IN
=3.6V
V
IN
=4.2V
V
IN
=3.0V
3 LEDs, 6.8
μ
H
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
1
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| AIC1648CGTR | Built-in OVP White LED Step-Up Converter |
| AIC1648PGBG | Built-in OVP White LED Step-Up Converter |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AIC1648CGTR | 制造商:AIC 制造商全稱:Analog Intergrations Corporation 功能描述:Built-in OVP White LED Step-Up Converter |
| AIC1648PGBG | 制造商:AIC 制造商全稱:Analog Intergrations Corporation 功能描述:Built-in OVP White LED Step-Up Converter |
| AIC1648PGTR | 制造商:AIC 制造商全稱:Analog Intergrations Corporation 功能描述:Built-in OVP White LED Step-Up Converter |
| AIC1648XXXX | 制造商:AIC 制造商全稱:Analog Intergrations Corporation 功能描述:Built-in OVP White LED Step-Up Converter |
| AIC1650 | 制造商:AIC 制造商全稱:Analog Intergrations Corporation 功能描述:3-Cell, High-Efficiency, Inverting DC/DC Converter |
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