MP3399-12-STRING, CASCADING WHITE LED DRIVER WITH STEP-UP CONTROLLER

MP3399 Rev. 1.0

www.MonolithicPower.com

7

3/27/2013

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© 2013 MPS. All Rights Reserved.

Pin #

Name

Description

16

LED7

LED String 7 Current Input. This pin is the open-drain output of an internal dimming

control switch. Connect the LED String 7 cathode to this pin.

17

LED6

LED String 6 Current Input. This pin is the open-drain output of an internal dimming

control switch. Connect the LED String 6 cathode to this pin.

18

LED5

LED String 5 Current Input. This pin is the open-drain output of an internal dimming

control switch. Connect the LED String 5 cathode to this pin.

19

LED4

LED String 4 Current Input. This pin is the open-drain output of an internal dimming

control switch. Connect the LED String 4 cathode to this pin.

20

LED3

LED String 3 Current Input. This pin is the open-drain output of an internal dimming

control switch. Connect the LED String 3 cathode to this pin.

21

LED2

LED String 2 Current Input. This pin is the open-drain output of an internal dimming

control switch. Connect the LED String 2 cathode to this pin.

22

LED1

LED String 1 Current Input. This pin is the open-drain output of an internal dimming

control switch. Connect the LED String 1 cathode to this pin.

23

OVP

Over-voltage Protection Input. Connect a resistor divider from output to this pin to

program the OVP threshold. When this pin voltage reaches 1.23V, the MP3399 triggers

OV Protection mode.

24

ISENSE

Current Sense Input. During normal operation, this pin senses the voltage across the

external inductor current sensing resistor for peak current mode control and also to limit

the inductor current during every switching cycle. If this pin is not used in extending

application with other master MP3399, tie this pin to GND, do not let this pin floating.

25

PGND

Step-up Converter Power Ground.

26

GATE

Step-up Converter Power Switch Gate Output. This pin drives the external power N-MOS

device.

27

VFAULT

Fault Disconnection Switch Gate Output. When the system starts up normally, this pin

smoothly turns on the external PMOS. When the MP3399 is disabled, the external

PMOS is turned off to disconnect the input and output. A ceramic cap is recommended to

add from this pin to GND to control the PMOS turn on speed so as to control the inrush

current at system start up.

28

NC

No Connect.