LM3743 datasheet(4/23 Pages) NSC

4 / 23 page

Electrical Characteristics V

CC = 3.3V, COMP/EN floating unless otherwise indicated in the conditions

column. Limits in standard type are for T

J = 25˚C only; limits in boldface type apply over the junction temperature (TJ) range of

-40˚C to +125˚C. Minimum and Maximum limits are guaranteed through test, design, or statistical correlation. Typical values

represent the most likely parametric norm at T

J = 25˚C, and are provided for reference purposes only. (Continued)

Symbol

Parameter

Conditions

Min

Typ

Max

Units

RAMP

PWM Ramp Amplitude

1.0

LOGIC INPUTS AND OUTPUTS

COMP/EN-HI COMP/EN pin logic high trip-point

0.65

0.9

COMP/EN-LO COMP/EN pin logic low trip-point

0.1

0.45

HICCUP MODE

LSCYCLES

Low-side sensing cycles before hiccup

mode

Cycles

LSRESET

Low-side sensing cycles reset without

activating current limit

Cycles

UVP

Under Voltage Protection comparator

threshold

400

GLICH-UVP

Under Voltage Protection fault time before

hiccup mode

7µs

HICCUP

Hiccup timeout

5.5

Soft-start time coming out of hiccup mode

3.6

THERMAL RESISTANCE

Junction to Ambient Thermal Resistance

235

˚C/W

Note 1: Absolute maximum ratings indicate limits beyond which damage to the device may occur. Operating ratings indicate conditions for which the device

operates correctly. Operating Ratings do not imply guaranteed performance limits.

Note 2: Practical lower limit of VCC depends on selection of the external MOSFET. See the MOSFET GATE DRIVERS section under Application Information for

further details.

Note 3: ESD using the human body model which is a 100 pF capacitor discharged through a 1.5 k

Ω resistor into each pin. Test method is per JESD22–A114.

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