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L5100 Datasheet Preview

L5100 Datasheet

WHITE LED STEP-UP CONVERTER

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L5100 pdf
UNISONIC TECHNOLOGIES CO.,
L5100
LINEAR INTEGRATED CIRCUIT
WHITE LED STEP-UP
CONVERTER
21
3
DESCRIPTION
The UTC L5100 is a STEP-UP DC/DC Converter and
designed for driving white LEDs with a constant current. It
can drive several LEDs in series by a Li-Ion cell. UTC L5100
switches at a high frequency 1.2MHz, so it can allowing the
use of tiny external components. The output capacitor can be
as small as 0.22µF, saving space and cost compare with
alternative other solutions. The low 95mV feedback voltage
minimizes power loss in the current setting resistor can have
better efficiency.
5
4
SOT-25
1
SOT-363
FEATURES
* Inherently Matched LED Current
* High Efficiency: 83% Typical
* Drives Up to Four LEDs from a 3.2V Supply
* Drives Up to Six LEDs from a 5V Supply
* 36V Rugged Bipolar Switch
* 1.2MHz Switching Frequency
* Uses Tiny 1mm Tall Inductors
* Output Capacitor can be small to only 0.22µF
www.DataSheet4U.com
*Pb-free plating product number: L5100L
ORDERING INFORMATION
Ordering Number
Normal
Lead Free Plating
L5100-AF5-R
L5100L-AF5-R
L5100-AN3-R
L5100L-AN3-R
Package
SOT-25
SOT-363
Packing
Tape Reel
Tape Reel
www.unisonic.com.tw
Copyright © 2005 Unisonic Technologies Co.,
1
QW-R103-024,A



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UTC

L5100 Datasheet Preview

L5100 Datasheet

WHITE LED STEP-UP CONVERTER

No Preview Available !

L5100 pdf
L5100
PIN DESCRIPTION
LINEAR INTEGRATED CIRCUIT
PIN NO.
SOT-25 SOT-363
11
2 2/5
33
44
56
PIN NAME SYMBOL
FUNCTION
Switch
Ground
Feedback
Shutdown
Input Supply
SW
GND
FB
SHDN
VIN
Connect inductor/diode here. Minimize trace area at this pin to
reduce EMI.
Connect directly to local ground plane.
Reference voltage is 95mV. Connect cathode of lowest LED and
resistor here. Calculate resistor value according to the formula:
RFB = 95mV/ILED
Connect to 1.5V or higher to enable device; 0.4V or less to disable
device.
Input Supply Pin. Must be locally bypassed.
BLOCK DIAGRAM
VIN
Pin 5 (SOT-25)
Pin 6 (SOT-363 ) 5
VREF
1.25V
FB SW
31
-
95mV + A1
-
Rc + A2
Cc
RSQ
DRIVER
Q1
Σ RAMP
1 .2MHz
GENERATOR
TIME CONTROL
SHUTDOWN
SHDN 4
Slope compensation
+
0 .2Ω
-
2 GND
Pin 2 /5 (SOT-363 )
Pin 2 (SOT-25 )
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
2
QW-R103-024,A


Part Number L5100
Description WHITE LED STEP-UP CONVERTER
Maker UTC
Total Page 7 Pages
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