LED7708 datasheet(9/53 Pages) STMICROELECTRONICS

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LED7708

Pin function

Doc ID 022698 Rev 1

9/53

CH14

Driver output (channel) #14.

CH15

Driver output (channel) #15.

CH16

Driver output (channel) #16.

AGND

Analog ground. Common return for the current generators (channels).

VMIN

Minimum output voltage setting. Multi-level input (high, low, floating or resistor to SGND).

Used in conjunction with the VFB pin to set the best output voltage range swing for a given

LED array. See related section for further details.

CSNS

External MOSFET current sense input. Connect to the sensing resistor in series with the

power switch (source of the power MOSFET node).

PGND

Power ground. Reference for the external MOSFET current sensing circuit and return for

the gate driver.

GATE

External MOSFET gate driver output. Connected to the gate of the power MOSFET.

VDR

Gate driver supply. Internally connected to the 5 V LDO regulator. Bypass with a 1 µF

ceramic capacitor to PGND as close as possible to the chip.

LREN

3.3 V linear regulator enable. When high or floating, the internal 3.3 V linear regulator is

used to supply the device. Also used to turn off the device for power consumption

reduction. To be left floating the internal 3.3 V LDO is overdriven by an external 3.3 V

supply rail.

VIN

Input of the LDO linear regulators. Bypass with a 1µF ceramic capacitor to ground as close

as possible to the chip.

LDO3

3.3 V device supply and internal 3.3 V linear regulator output. Bypass with a 1 µF ceramic

capacitor to ground as close as possible to the chip.

VFB

Output voltage feedback for the boost controller. Connect to the central tap of the output

resistor divider. See the related section for details.

Table 2.

Pin description (continued)

Function

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