MEL7136手电筒恒流驱动IC
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Adjustable Constant Current LED Driver MEL7136
Features
Typical Application
Selection Guide
z Sink current:10mA to1A adjustable with an external
resistor
z Current and voltage range extendable by adding an
external NMOS or NPN transistor z Power supply voltage: 2.7-18V z Low drop out voltage: 50mV@1A z Low quiescent current: 80uA
z Thermal Shutdown protection ：165℃ z Soft start
z Low voltage protection: 2.5V z Package:SOT89-5,ESOP8.
Typical Application Circuit
Low Voltage And Light Load (Under 1A) Low Voltage And Heavy Load (Exceed 1A)
High Voltage Application
R EXT Resistor Value selection:
R EXT (Ω) ILED(mA)
10 10 1
100
0.286 350 0.1 1000
Pin Configuration
Pin Assignment
MEL7136
Pin Number
Pin Name Functions
ESOP8 SOT89-5
2 1 CS Output current detection
1 2
D(LED)
The
negative
input feet of LED
3 3
VDD Power
Input
5 4
GND Ground
7 5 EXT Driving external NMOS
4,6,8 NC No
connection
Absolute Maximum Ratings
Parameter Symbol
Ratings
Units Input Voltage V DD 18 V Voltage on LED,CS V LED, V CS,-0.3～V DD+0.3 V
Voltage on EXT V EXT 6 V
Output Current I OUT 1.5 A
Power Dissipation SOT89-5 P D
500
mW
1300（PCB mounted）（*1）
ESOP8 P D
400 mW
(T=25℃)
2000（PCB mounted）（*1）
Operating Temperature Range T OPR－40～＋125 ℃
Storage Temperature Range T STG－40～＋150 ℃
Lead Temperature 260℃，4sec
ESD(ESD voltage for human body model ) V ESD 2000 V *1:The power dissipation figure shown in PCB mounted. Please refer to page8-9 for details.
Block Diagram
Electrical Characteristics
MEL7136
(V DD= 3.6V, Ta=25O C, unless otherwise noted)
Parameter Symbol Conditions Min.Typ.Max.Units
Sink Current I sink V DD
= 3.6V 10 1000
mA Input Voltage V DD I
sink
=1A
2.7 18
V CS Voltage V CS95
100
105
mV Sink current accuracy △ILED/ILED I sink=1A -5 -2.5 5 %
Load Regulation LDR VLED=0.2V to 3V
VDD=3.6V
0.1 2
mA/V
Line Regulation LNR
VLED= 3V
3.6V≤V DD≤18V
0.4 2
mA/V
Output dropout
voltage
V drop VDD=3.6V, VLED= 0.5V50 100 mV
Quiescent Current I SS V DD
= 3.6V
80
100
uA
Low Voltage Protection 2.3
2.5
2.7
V
Low voltage hysteresis Vhys 0.15 V
Thermal Shutdown protection：Tsd 165
℃