or HO. (Continued)

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

CURRENT LIMIT

ILIMIT Amp Transconductance

16

mA / V

Overall Transconductance

237

mA / V

Positive Current Limit

V

VOUT = 6V and CO/COMP = 1.5V

37

45

53

mV

Positive Current Limit Foldback

V

VOUT = 0V and CO/COMP = 1.5V

31

38

45

mV

VCLneg

Negative Current Limit

VOUT = 6V

V

shutoff

-17

mV

RAMP GENERATOR

SYNC Input Impedance

2.5

k

Ω

SYNC Threshold

End of cycle detection threshold

15

µA

Free Run Mode Peak Threshold

RAMP peak voltage with dc current

applied to SYNC.

2.3

V

Current Mirror Gain

Ratio of RAMP charge current to

SYNC input current.

2.7

3.3

A/A

Discharge Impedance

100

Ω

LOW SIDE GATE DRIVER

V

OLL

LO Low-state Output Voltage

I

0.2

0.5

V

V

OHL

LO High-state Output Voltage

I

0.4

0.8

V

LO Rise Time

C

15

ns

LO Fall Time

C

12

ns

I

OHL

Peak LO Source Current

V

2

A

I

OLL

Peak LO Sink Current

V

2.5

A

HIGH SIDE GATE DRIVER

V

OLH

HO Low-state Output Voltage

I

0.2

0.5

V

V

OHH

HO High-state Output Voltage

I

0.4

0.8

V

HO Rise Time

C

15

ns

HO High Side Fall Time

C

12

ns

I

OHH

Peak HO Source Current

V

2

A

I

OLH

Peak HO Sink Current

V

2.5

A

SWITCHING CHARACTERISITCS

LO Fall to HO Rise Delay

C

70

ns

HO Fall to LO Rise Delay

C

50

ns

SYNC Fall to HO Fall Delay

C

120

ns

SYNC Rise to LO Fall Delay

C

50

ns

THERMAL SHUTDOWN

T

SD

Thermal Shutdown Temp.

150

165

˚C

Thermal Shutdown Hysteresis

25

˚C

THERMAL RESISTANCE

θ

JA

Junction to Ambient

MTC Package

125

˚C/W

θ

JA

Junction to Ambient

SDA Package

32

˚C/W

Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the component may occur. Operating Ratings are conditions under which operation of

the device is guaranteed. Operating Ratings do not imply guaranteed performance limits. For guaranteed performance limits and associated test conditions, see the

Electrical Characteristics tables.

Note 2: The human body model is a 100 pF capacitor discharged through a 1.5k

Ω resistor into each pin.

Note 3: Min and Max limits are 100% production tested at 25˚C. Limits over the operating temperature range are guaranteed through correlation using Statistical

Quality Control (SQC) methods. Limits are used to calculate National’s Average Outgoing Quality Level (AOQL).

Note 4: Device thermal limitations may limit usable range.

www.national.com

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