LM3492, LM3492Q

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SNVS656C – SEPTEMBER 2010 – REVISED MAY 2013

PIN DESCRIPTIONS (continued)

Pin

Name

Description

Application Information

14

LGND

Ground of the Current Regulator

Current regulator ground. Must be connected to the GND pin for normal

operation. The LGND and GND pins are not internally connected.

15

DIM1/CLK

Dimming Control of Channel 1

Control the on/off of the current regulator of channel 1. This pin is internally

pulled low by a 5 µA current. This pin also serves as a clock signal for

latching input/output data of the COMM pin.

16

DIM2

Dimming Control of Channel 2

Control the on/off of the current regulator of channel 2. This pin is internally

pulled low by a 5 µA current.

17, 18

PGND

Power Ground

Integrated MOSFET ground. Must be connected to the GND pin for normal

operation. The PGND and GND pins are not internally connected.

19

VCC

LDO Regulator Output

Nominally regulated to 5.5V. Connect a capacitor of larger than 0.47 µF

between the VCC and GND pins.

20

ILIM

Peak Current Limit Adjust

Connect an external resistor from the ILIM pin to the VCC pin reduces

peak current limit. Connect the ILIM pin to the ground to obtain the

maximum current limit.

DAP

DAP

Exposed Pad

Thermal connection pad. Connect to a ground plane.

These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam

during storage or handling to prevent electrostatic damage to the MOS gates.

ABSOLUTE MAXIMUM RATINGS

(1)

VALUE / UNITS

VIN, RT, VOUT to GND

−0.3V to 67V

SW to GND

−0.3V to 67V

SW to GND (Transient)

−2V (<100 ns)

ILIM to GND

−0.3V to 0.3V

FB to GND

−0.3V to 5V

COMM, DIM1, DIM2, to GND

−0.3V to 6V

±2kV

Storage Temperature Range

−65°C to +150°C

150°C

(1)

Absolute Maximum Ratings are limits which damage to the device may occur. Operating ratings are conditions under which operation of

the device is intended to be functional. For specifications and test conditions, see the electrical characteristics. Thermal shutdown might

occur within ambient operating temperature range as junction temperature rises above TSD level, customer should refer to efficiency

data and thermal resistance data to estimate the junction temperature to ambient temperature delta.

(2)

The human body model is a 100 pF capacitor discharged through a 1.5 k

Ω resistor into each pin.

RECOMMENDED OPERATING CONDITIONS

(1)

Supply Voltage (VIN)

4.5V to 65V

−40°C to +125°C

Thermal Resistance (

(2)

32.7°C/W

(1)

Absolute Maximum Ratings are limits which damage to the device may occur. Operating ratings are conditions under which operation of

the device is intended to be functional. For specifications and test conditions, see the electrical characteristics. Thermal shutdown might

occur within ambient operating temperature range as junction temperature rises above TSD level, customer should refer to efficiency

data and thermal resistance data to estimate the junction temperature to ambient temperature delta.

(2)

The

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