Specifications in standard type face are for T

perature range. V

Symbol

Parameter

Conditions

Typical

Limit

Units

V

EAL

Error Amplifier Output Swing

Lower Limit

1.25

1.35/1.50

V

V(max)

V

D

Body Diode Voltage

I

1

V

f

OSC

Oscillator Frequency

V

300

280/255

330/345

kHz

kHz(min)

kHz(max)

D

MAX

Maximum Duty Cycle

V

95

92

%

%(min)

I

SS

Soft-Start Current

Voltage at the SS pin = 1.4V

11

7

14

µA

µA(min)

µA(max)

I

SHUTDOWN

Shutdown Pin Current

Shutdown Pin Pulled Low

2.2

0.8/0.5

3.7/4.0

µA

µA(min)

µA(max)

v

SHUTDOWN

Shutdown Pin Threshold

Voltage

Falling Edge

0.6

0.3

0.9

V

V(min)

V(max)

T

SD

Thermal Shutdown

Temperature

165

˚C

T

SD_HYST

Thermal Shutdown Hysteresis

Temperature

25

˚C

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

intended to be functional, but device parameter specifications may not be guaranteed under these conditions. For guaranteed specifications and test conditions, see

the Electrical Characteristics.

ambient temperature, and

allows the safe dissipation of more power. The Absolute Maximum power dissipation must be derated by 7.14mW per ˚C above 25˚C ambient. The LM2651 actively

limits its junction temperature to about 165˚C.

Note 3: The human body model is a 100pF capacitor discharged through a 1.5k

Ω resistor into each pin.

Note 4: Typical numbers are at 25˚C and represent the most likely norm.

Note 5: All limits are guaranteed at room temperature (standard typeface) and at temperature extremes (boldface type ). All room temperature limits are 100%

production tested. All limits at temperature extremes are guaranteed via correlation using standard Statistical Quality Control (SQC) methods. All limits are used

to calculate Average Outgoing Quality Level (AOQL).

www.national.com

5