Unless otherwise specified, all limits are guaranteed for T

otherwise noted. Boldface apply over the temperature extremes. ’V

regulation.

Symbol

Parameter

Conditions

Min

(Note 5)

Typ

(Note

6)

Max

(Note 5)

Units

I

SS

Softstart Pin Current

V

2.5

4.5

8

µA

I

SD

Shutdown Supply Current

V

26

52

75

µA

I

STDBY

Standby Supply Current

V

2.3

4

4.3

mA

V

UVLO

Undervoltage Lockout Threshold

Comp Open, V

2.2

2.38

2.5

V

V

SD

Shutdown Threshold

Comp Open, V

0.75

1.0

1.28

V

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 specific performance is not guaranteed. For guaranteed specifications and the test conditions, see the Electrical Characteristics.

Note 2: This is for the human body model, which is a 100pF capacitor discharged through a 1.5k resistor into each pin.

Note 3: Minimum input voltage is defined as the voltage where internal bias lines are still regulated so that the reference voltage and oscillator remain constant.

Actual minimum input voltage to maintain output in regulation depends on output voltage and load current. In particular, the required duty cycle must be less than

on-time, which is about 300ns.

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

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

Average Outgoing Quality Level (AOQL).

Note 6: Typical numbers are at 25˚C and represent the most likely norm.

Note 7: Transconductance and voltage gain refer to the internal amplifier, excluding any voltage divider as is present on the fixed voltage parts. To calculate the gain

part.

Note 8: To ensure stable operation, the maximum recommended operating duty cycle is 80%.

www.national.com

6