LM3421 datasheet(4/72 Pages) TI1

4 / 72 page

LM3421, LM3421-Q1, LM3423, LM3423-Q1

SNVS574F – JULY 2008 – REVISED JULY 2015

www.ti.com

Pin Functions (continued)

I/O

DESCRIPTION

FUNCTION

NAME

LM3423

LM3421

Connect to the drain of the main N-channel MOSFET switch

Main switch current sense

for RDS-ON sensing or to a sense resistor installed in the

source of the same device.

Connect the low side of all external resistor dividers (VIN

RPD

Resistor Pulldown

UVLO, OVP) to implement zero-current shutdown.

LED current sense

Connect through a series resistor to the positive side of the

HSP

positive

LED current sense resistor.

LED current sense

Connect through a series resistor to the negative side of the

HSN

negative

LED current sense resistor.

Thermal PAD on bottom

Star ground, connecting AGND and PGND.

DAP

DAP (21) DAP (17)

GND

of IC

6 Specifications

6.1 Absolute Maximum Ratings

over operating free-air temperature range (unless otherwise noted)

(1) (2)

MIN

MAX

UNIT

VIN, EN, RPD, nDIM

–0.3

–1 continuous

OVP, HSP, HSN, LRDY, FLT, DPOL

–0.3

–100 continuous

µA

RCT

–0.3

–1 continuous

5 continuous

–0.3

–2 for 100 ns

–1 continuous

VCC

–0.3

TIMR

–0.3

–100 continuous

100 continuous

µA

COMP, CSH

–0.3

–200 continuous

200 continuous

µA

GATE, DDRV

–0.3

VCC

–2.5 for 100 ns

VCC+ 2.5 for 100 ns

–1 continuous

1 continuous

PGND

–0.3

0.3

–2.5 for 100 ns

2.5 for 100 ns

Continuous power dissipation

Internally Limited

Maximum junction temperature

Internally Limited

Maximum lead temperature (solder and reflow) (3)

260

°C

Storage temperature

–65

150

°C

(1)

Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings

only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended

Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

(2)

If Military/Aerospace specified devices are required, contact the Texas Instruments Sales Office/Distributors for availability and

specifications.

(3)

Refer to http://www.ti.com/packaging for more detailed information and mounting techniques.

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Product Folder Links: LM3421 LM3421-Q1 LM3423 LM3423-Q1

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