Datasheet

UNISONIC TECHNOLOGIES CO., LTD
UC3501
Preliminary
CMOS IC
HIGH EFFICIENT, LOW COST
FLASHLIGHT LED DRIVE

DESCRIPTION
UTC UC3501 is Flashlight ASIC chip, Using LSI technology,
Specifically designed for single dry battery, Plus 1 of inductors,
May constitute a drive circuit for LED flashlights.

FEATURES
* High efficiency:85%~90%
* Low cost
* Simply add-ins one inductor

ORDERING INFORMATION
Order Number
Lead Free
Halogen Free
UC3501L-T92-B
UC3501G-T92-B
UC3501L-T92-K
UC3501G-T92-K
Note: Pin Assignment: G: GND
D: VDD
O: OUT

Package
TO-92
TO-92
Pin Assignment
1
2
3
O
D
G
O
D
G
Packing
Tape Box
Bulk
MARKING INFORMATION
PACKAGE
TO-92
MARKING
UTC
UC3501
L: Lead Free
G: Halogen Free
Data Code
1
www.unisonic.com.tw
Copyright © 2014 Unisonic Technologies Co., Ltd
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UC3501

Preliminary
CMOS IC
BLOCK DIAGRAM
VDD
VOUT
OSCILLATOR
ERROR
AMPLIFIER
VFM
CONTROL
VREF
VIX LIMITER
GND
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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UC3501

Preliminary
CMOS IC
ABSOLUTE MAXIMUM RATING
PARAMETER
SYMBOL
RATINGS
UNIT
Input Voltage
VIN
6
V
Output Current
IOUT
150
mA
Operating Junction Temperature
TJ
-40~85
°C
Storage Temperature
TSTG
-55~150
°C
Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.

ELECTRICAL CHARACTERISTICS (TA=25°C)
PARAMETER
Supply Voltage
Start Voltage
Output Current
Oscillator Frequency
Efficiency
SYMBOL
VDD
VSTART
IOUT
FOSC
η
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
TEST CONDITIONS
MIN
0.9
TYP
0.9
100
100
85
MAX
5.0
UNIT
V
V
mA
KHz
%
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UC3501

Preliminary
CMOS IC
TYPICAL APPLICATION CIRCUIT
2
47µH
UTC
UC3501
VOUT 1
VIN
GND
3
L1
LED
L2
LED
R1
10
L3
LED
R2
10
R3
10
UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or
other parameters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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