V

boldface type apply over full Operating Temperature Range. Datasheet min/max specification limits are guaranteed by design,

test, or statistical analysis.

Symbol

Parameter

Conditions

Min

Typ

Max

Units

GATE DRIVE

I

Q-BOOT

BOOT Pin Quiescent Current

BOOTV = 12V, EN = 0

0˚C to +125˚C

-40˚C to +125˚C

95

95

160

215

µA

R

DS1

Top FET Driver Pull-Up ON

resistance

3

Ω

R

DS2

Top FET Driver Pull-Down ON

resistance

2

Ω

R

DS3

Bottom FET Driver Pull-Up ON

resistance

3

Ω

R

DS4

Bottom FET Driver Pull-Down

ON resistance

2

Ω

OSCILLATOR

f

OSC

PWM Frequency

R

Ω

50

kHz

R

Ω

300

R

Ω, 0˚C to +125˚C

500

600

700

R

Ω, -40˚C to +125˚C

490

600

700

R

Ω

1400

R

Ω

2000

D

Max Duty Cycle

f

f

90

88

%

LOGIC INPUTS AND OUTPUTS

V

SD-IH

SD Pin Logic High Trip Point

2.6

3.5

V

V

SD-IL

SD Pin Logic Low Trip Point

0˚C to +125˚C

-40˚C to +125˚C

1.3

1.25

1.6

1.6

V

V

PWGD-TH-LO

PWGD Pin Trip Points

FB Voltage Going Down

0˚C to +125˚C

-40˚C to +125˚C

0.413

0.410

0.430

0.430

0.446

0.446

V

V

PWGD-TH-HI

PWGD Pin Trip Points

FB Voltage Going Up

0˚C to +125˚C

-40˚C to +125˚C

0.691

0.688

0.710

0.710

0.734

0.734

V

V

PWGD-HYS

PWGD Hysteresis (LM2737 only) FB Voltage Going Down FB Voltage

Going Up

35

110

mV

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. Opearting Ratings do not imply guaranteed performance limits.

Note 2: The human body model is a 100pF capacitor discharged through a 1.5k resistor into each pin.

www.national.com

4