ME2212
Small Package, High Performance, Asynchronies Boost
For 10 WLED Driver
ME2212
General Description：
The ME2212
is a high frequency, asynchronous
boost converter. The internal MOSFET can support
up to 10 White LEDs for backlighting and OLED
power application, and the internal soft start
function can reduce the inrush current.
T
he device
operates with 1-MHz fixed switching frequency to
allow small external components and to simplify
possible EMI problems. Moreover, the IC comes
with 46V over voltage protection to allow inexpen-
sive and small-output capacitors with lower voltage
ratings. The LED current is initially set with the
external sense resistor Rs.
200kHz)
1MHz Switching Frequency
Minimize the External Component Counts
Internal Soft Start
Internal Compensation
Under Voltage Protection
Over Voltage Protection
Over Temperature Protection
Features：
VIN Operating Range : 2.5V to 5.5V
Internal Power N-MOSFET Switch
Wide Range for PWM Dimming (100Hz to
Applications：
Cellular Phones
Digital still cameras
PDAs and Smart Phones and MP3
and OLED.
Probable Instruments
Typical Application：
Rs Resistor Value Selection：
TYP.（Ω）
10
I
LED
( mA )
20
I
LED
=20mA， Rs=10Ω
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ME2212
Selection Guide：
Pin Configuration& Marking Information：
SOT23-6
Pin information：
Pin Number
1
2
3
4
5
6
Name
LX
GND
FB
EN
VOUT
VIN
Function
Switch
Ground
Feedback
Chip Enable
Output
Input
Absolute Maximum Ratings：
Parameter
Input Voltage
LX Pin Voltage
FB Pin Voltage
Operating Temperature Range
Storage Temperature Range
Lead Temperature (Soldering, 10 sec)
Internal Power Dissipation（SOT23-6）
Symbol
V
IN
LX
FB
T
OPR
T
STG
T
L
P
D
Ratings
－0.3V~6V
－0.3V~6V
－0.3V~6V
－40℃~85℃
－65℃~125℃
260℃
400
Units
V
V
V
℃
℃
℃
mW
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ME2212
Typical Operating Characteristics
1. Efficiency vs. Output Current
（3
White LEDs
）
Efficiency vs.Output Current
100
90
Efficiency(%)
2.
Efficiency vs. Input Voltage
（10
White LEDs
）
Efficiency vs.Input Voltage
80
70
60
50
40
30
20
50
100
150
200
250
300
350
VIN=4V
VIN=4.5V
Efficiency(%)
100
90
80
70
60
50
40
30
20
2.5
I
LOAD
=30mA
I
LOAD
=20mA
I
LOAD
=10mA
3
3.5
4
4.5
5
5.5
Output Current(mA)
Input Voltage(V)
3. Frequency vs. Input Voltage
（I
LED
=20mA）
Frequency vs.Input Voltage
1100
1050
1000
950
900
850
800
2.5
3
3.5
4
4.5
5
5.5
Frequency (kHZ)
Frequency(kHZ)
4. Frequency vs. Temperature
（V
IN
=3.7V,I
LED
=20mA）
Frequency vs.Temperature
1100
1050
1000
950
900
850
800
-25
-10
5
20
35
50
65
80
95
110 125
Input Voltage (V)
Temperature (℃)
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嵌入式系统
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