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PDF MP3011 Data sheet ( Hoja de datos )
| Número de pieza | MP3011 | |
| Descripción | High Efficiency Charge Pump 2 White LED Driver | |
| Fabricantes | MPS | |
| Logotipo |  |
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TM
MP3011
1x, 1.5x, 2x High Efficiency Charge Pump
2 White LED Driver
The Future of Analog IC Technology TM
DESCRIPTION
FEATURES
The MP3011 is a fully automatic driver for
powering two white LEDs, with up to 4V forward
voltage, from a single Li-Ion or three NiMH
cells. The driver performs all of the sensing and
control to run the LEDs at an optimum charge
pump ratio for efficiency without an expensive
inductor. The driver allows PWM operation to
support brightness control.
The tiny 3mm x 3mm QFN16 package and
small external capacitors allow for the most
compact white LED solution available.
EVALUATION BOARD REFERENCE
Board Number
EV3011DQ-00A
Dimensions
2.4” x 1.9” x 0.4”
• 2% LED Current Matching
• High Efficiency (>93%)
• Current Source Outputs
• No Ballast Resistors Required
• 1x, 1.5x and 2x Automatic Modes
• Constant Frequency Operation
• Automatic LED Detection
• High and Low Frequency PWM Capability
• 2.5V to 5.5V Operation
• Less than 1µA Leakage during Shutdown
• Detects Changes in Battery Level
• No External Schottky Diode Required
• Soft-Start and Soft Switching Operation
APPLICATIONS
• Cell Phones
• PDA or Hand Held Computers
• White LED Application at 3.6V Supply
“MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic
Power Systems, Inc.
TYPICAL APPLICATION
BATT
MP3011
5, 13
4
BATT C1A
ENABLE
12
EN
7
C1B
11 6
RADJ C2A
GND
3, 10
GND
9
C2B
15
LED1
8 16
LEDC LED2
LED2
LED1
MP3011_TAC01
Efficiency vs
Supply Voltage
VLED = 3.35V @ 40mA
100
90
ILED=10mA
ILED=40mA
80
70
60
50
40 ILED=20mA
30
20
10
0
2.5 3.0 3.5 4.0
SUPPLY VOLTAGE (V)
4.5
MP3011_EC01
MP3011 Rev. 1.1
10/31/2005
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2005 MPS. All Rights Reserved.
1
1 page  
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MP3011 – 1X, 1.5X, 2X AUTO-ADJUST CHARGE PUMP 2 WHITE LED DRIVER
OPERATION
The MP3011 is a charge pump that drives 2
LEDs from a 2.5V to 5.5V input voltage. It
automatically switches between 1x, 1.5x and 2x
charge pump modes to optimize efficiency while
maintaining LED current regulation.
Two drivers independently regulate the current
through the LEDs, therefore matching LEDs are
not required.
The MP3011 employs soft switching and
soft-start to prevent overloading the battery
source at turn-on as well as charge pump mode
switching.
While operating, the MP3011 continually
monitors the LED current and battery voltage
and automatically switches between charge
pump modes to retain LED current regulation
through all LEDs as the battery voltage
fluctuates.
BATT
ENABLE
BATT
5, 13
BATTERY
SENSOR
FAULT
CURRENT
SOURCE
LED1
15
EN
12
RADJ
11
CONTROLLER
FAULT
CURRENT
SOURCE
SHUTDOWN
CURRENT
GENERATOR
LED
ENABLE
ISET
PUMP SOFT
MODE START
1.25V
BANDGAP
REFERENCE
CHARGE PUMP
GND
3, 10
Figure 1—Functional Block Diagram
LED2
16
LED2 LED1
LEDC
8
C1A
4
C1B
7
C2A
6
C2B
9
MP3011_F01_BD01
MP3011 Rev. 1.1
10/31/2005
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2005 MPS. All Rights Reserved.
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet MP3011.PDF ] | |
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