LR256 Datasheet, PDF (1/8 Pages) Leshan Radio Company – Fast 1.2MHz Switching Frequency Requires Only 0.22uF Output Capacitor

LESHAN RADIO COMPANY, LTD.
LR256 White LED Step-Up Converter
LR256 is a step-up DC/DC converter
specifically designed to drive white LED with a
constant current. It can drive two,three,or four
LEDS. It switches at 1.2MHz and use tiny
external components. The output capacitor can
be as small as 0.22uF,which can save space
and cost versus alternative solutions. Feedback
¾ Fast 1.2MHz Switching Frequency
¾ Requires Only 0.22uF Output Capacitor
¾ Inherently Matched LED Current
¾ High Efficiency: 85% Typical
¾ 2.5V to 10V V_IN ranges
¾ Drives Up to Four series LEDs with a Li-lon cell
¾ Uses Very Tiny Inductors
¾ SOT-25 Package
voltage is as low as 95mV.
Absolute maximum ratings
Parameter
Supply Voltage
Feedback Voltage
Switch Voltage
CE Voltage
Operating temperature range
Storage temperature range
Junction temperature
symbol
value
unit
V_IN
10
V
FB
10
V
SW
20
V
V_CE
10
V
T_opr
-25 to +70
℃
R_stg
-55 to +150
℃
T_j
125
℃
Pin name
1
2
3
Description
Symbol
Description
Symbol
5
1：Switch
4
5：Supply
SW
VIN
Voltage
2：GND
GND
3：Feedback
FB
4：Start-Up
CE
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