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PDF EMD2055 Data sheet ( Hoja de datos )
| Número de pieza | EMD2055 | |
| Descripción | PWM Step-Up DC/DC Converter | |
| Fabricantes | Elite Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de EMD2055 (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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ESMT/EMP
Preliminary
EMD2055
PWM Step-Up DC/DC Converter for Panel Backlight (11 WLEDs Driver)
General Description
The EMD2055 is a highly efficient, step-up DC/DC
converter for driving white LEDs. The device can
drive up to 11 serially connected white LEDs from a
single Li-Ion battery, or to drive multiple serial and
parallel combinations with a DC power supply from
2.5V to 5.5V. The EMD2055 uses current mode and
pulse-width modulated (PWM) operation. Its high
switching operation frequency of 1.0MHz allows the
system to use small inductor, input and output
capacitors. An internal compensation circuit can
reduce the external component count.
To safeguard the system, the EMD2055 includes
various protection circuits such as under-voltage
lockout, current limit, over voltage and thermal
shutdown. EMD2055 are available in the tiny
packages of SOT-23-6L and TDFN-8L (2x2mm).
Applications
Mobile Phone
Digital Still Cameras
Portable applications
MP3 Players
GPS Receivers
Features
Up to 11 WLEDs supports
Low Quiescent Current: 120 µA
Over Voltage Protection: 36.5V
Inherently Matched LED Current
Shutdown Current < 1µA
Reference Voltage 0.24V
PWM Dimming Control (100Hz~100kHz)
Internal Soft Start and Compensation
1.5A Internal power MOSFET Switch
Low Profile SOT-23-6 and TDFN-8L Packages
Typical Application (9S3P)
Fig. 1
Elite Semiconductor Memory Technology Inc./Elite MicroPower Inc.
Publication Date: Jan. 2013
Revision: 0.03 1/13
1 page  
ESMT/EMP
Typical Performance Characteristics
VIN=3.7V, unless otherwise specified
Efficiency vs. Input Voltage (Vout=34V)
100
90
80
70
60
50
40
30
20
10
0
2.5
Efficiency vs. Input Voltage (Vout=34V)
ILOAD=20mA
ILOAD=40mA
ILOAD=60mA
3 3.5 4 4.5 5 5.5
Input Voltage (V)
Efficiency vs. Output current (Vout=24V)
100
90
80
70
60
50
40
30
20
10
0
1
Efficiency vs. Output Current (Vout=24V)
10 100
Output Current (mA)
Power On from EN
Vin=3.7V
Vin=5V
1000
Efficiency vs. Output Current (Vout=34V)
100
90
80
70
60
50
40
30
20
10
0
1
Efficiency vs. Output Current (Vout=34V)
10
Output Current (mA)
Vin=3.7V
Vin=5V
100
Efficiency vs. Output current (Vout=12V)
100
90
80
70
60
50
40
30
20
10
0
1
Efficiency vs. Output Current (Vout=12V)
10 100
Output Current (mA)
Vin=3.7V
Vin=5V
1000
Power Off from EN
Elite Semiconductor Memory Technology Inc./Elite MicroPower Inc.
Publication Date: Jan. 2013
Revision: 0.03 5/13
5 Page 
ESMT/EMP
Package Outline Drawing
TDFN-8L (2x2 mm)
Symbol
A
A1
A3
b
D
E
e
L
Dimension in mm
Min Max
0.70 0.80
0.00 0.05
0.18 0.25
0.18 0.30
1.95 2.05
1.95 2.05
0.50 BSC
0.20 0.45
Exposed pad
Dimension in mm
Min Max
D2 1.10 1.25
E2 0.55 0.70
Elite Semiconductor Memory Technology Inc./Elite MicroPower Inc.
Publication Date: Jan. 2013
Revision: 0.03 11/13
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet EMD2055.PDF ] | |
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