MP3011 MPS, MP3011 Datasheet - Page 5

• Manufacturer Part Number: MP3011
• Description: High Efficiency Charge Pump 2 White LED Driver
• Manufacturer: MPS

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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.
MP3011 Rev. 1.1
10/31/2005
ENABLE
BATT
TM
RADJ
BATT
GND
5, 13
3, 10
MP3011 – 1X, 1.5X, 2X AUTO-ADJUST CHARGE PUMP 2 WHITE LED DRIVER
EN
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
12
11
GENERATOR
REFERENCE
CURRENT
BANDGAP
BATTERY
SENSOR
Figure 1—Functional Block Diagram
1.25V
SHUTDOWN
© 2005 MPS. All Rights Reserved.
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CONTROLLER
MODE
PUMP
START
SOFT
CHARGE PUMP
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
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.
FAULT
FAULT
ENABLE
LED
operating,
CURRENT
CURRENT
SOURCE
SOURCE
ISET
the
LED1
15
LED2
16
LEDC
8
C1A
4
C1B
7
C2A
6
C2B
9
MP3011
LED2
continually
MP3011_F01_BD01
LED1
5