Electrical Characteristics

Specifications in standard type face are for T

range. Unless otherwise specified, V

Symbol

Parameter

Conditions

Typ (Note 4)

Limits (Note 5)

Units

I

Q2

Quiescent Current

Normal Mode, I

pin V

high

0.8

mA

1.0

mA(Max)

Z

out

Output Source

Impedance

I

1.8

Ω

3

Ω (Max)

f

SW

Switching

Frequency

(Note 6)

200

kHz

125

kHz(Min)

275

kHz(Max)

V

Enable

Enable Threshold

Voltage

1.7

V

1.0

V(Min)

2.5

V(Max)

I

Enable

Leakage Current

Current into ENABLE pin; ENABLE =

5V and all other pins at ground

0.025

µA

1

µA(Max)

Power Efficiency

95

%

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

tended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see Electrical Characteristics. The guar-

anteed specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test

conditions.

Note 2: For operation at elevated temperatures, LM3351 must be derated based on package thermal resistance of

Note 3: The human body model is a 100 pF capacitor discharged through a 1.5 kW resistor into each pin.

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

Note 5: Limits are 100% production tested at 25˚C. Limits over the operating temperature range are guaranteed through correlation using Statistical Quality Control

(SQC) methods. The limits are used to calculate National’s Averaging Outgoing Quality Level (AOQL).

Typical Performance Characteristics

V

DS100146-4

DS100146-5

Output Source Impedance vs

Temperature (Step-Up)

DS100146-6

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