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AIC1647 Fiches technique(PDF) 1 Page - Analog Intergrations Corporation

No de pièce AIC1647
Description  WHITE LED STEP-UP CONVERTER IN SOT23
Download  11 Pages
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Fabricant  AIC [Analog Intergrations Corporation]
Site Internet  http://www.analog.com.tw
Logo AIC - Analog Intergrations Corporation

AIC1647 Fiches technique(HTML) 1 Page - Analog Intergrations Corporation

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AIC1647
White LED Step-Up Converter in SOT23
Analog Integrations Corporation
Si-Soft Research Center
DS-1647P-03 010405
3A1, No.1, Li-Hsin Rd. I, Science Park, Hsinchu 300, Taiwan, R.O.C.
FEATURES
1.2MHz Fixed Frequency Current-Mode PWM
Operation.
Efficiency Up to 84% at VIN=4.2V, 3LEDs,
ILED=20mA
Drives Up to 6LEDs in series
Low Supply Current: 70
µA
Matches LED Current
Require Tiny Inductors and Capacitors
Tiny SOT23-5 Package
APPLICATIONS
Cellular Phones
PDAs
Digital Still Cameras
Handheld Devices
White LED Display Backlighting
DESCRIPTION
AIC1647 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 the LEDs
provides identical LED currents resulting in
uniform brightness. This configuration eliminates
the need for ballast resistors. Low 95mV
feedback voltage minimizes power loss in the
current setting resistor for better efficiency.
AIC1647 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, saves the layout space and cost.
AIC1647 is available in a space-saving, 5-lead
SOT-23-5 package.
TYPICAL APPLICATION CIRCUIT
L
6.8
µH
D1
SW
VIN
SHDN
FB
GND
AIC1647
3.3~4.2V
RFB
4.7
C1
1
µF
C2
1
µF
20mA
L1: 976AS-6R8M, TOKO
D1: RB521S-30, ROHM
C1: JMK107BJ105KA, TAIYO YUDEN
C2: EMK212BJ105KA, TAIYO YUDEN
BZV55-B12
11.8V~12.2V
R1
1K
D2
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 with Over Voltage Protection for Three White LEDs
TEL: 886-3-5772500
FAX: 886-3-5772510
www.analog.com.tw
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