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MP1519 Datasheet(PDF) 5 Page - Monolithic Power Systems

Part No. MP1519
Description  1x, 1.5x, 2x High Efficiency Charge Pump 4 White LED Driver
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Maker  MPS [Monolithic Power Systems]
Homepage  http://www.monolithicpower.com
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MP1519 Datasheet(HTML) 5 Page - Monolithic Power Systems

   
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MP1519 – 1X, 1.5X, 2X CHARGE PUMP 4 WHITE LED DRIVER
MP1519 Rev. 1.9
www.MonolithicPower.com
5
7/27/2006
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
TM
OPERATION
The MP1519 is a charge pump that drives 4
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.
Four drivers independently regulate the current
through the LEDs, therefore matching LEDs are
not required.
The MP1519 employs soft switching and
soft-start to prevent overloading the battery
source at turn-on and charge pump mode
switching.
While
operating,
the
MP1519
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.
CURRENT
GENERATOR
CONTROLLER
LED
ENABLE
ISET
SHUTDOWN
RADJ
GND
EN
BATT
11
3, 10
12
5, 13
CHARGE PUMP
1.25V
BANDGAP
REFERENCE
BATTERY
SENSOR
PUMP
MODE
SOFT
START
LED4
LED3
LED2
LED1
FAULT
CURRENT
SOURCE
FAULT
CURRENT
SOURCE
FAULT
CURRENT
SOURCE
FAULT
CURRENT
SOURCE
C2B
BATT
ENABLE
C2A
C1B
C1A
LEDC
LED4
LED3
LED2
LED1
9
6
7
4
8
1
16
15
14
Figure 1—Functional Block Diagram


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