Symbol

Parameter

Conditions

Typ

Min

Max

Units

(Note 4)

(Note 5)

(Note 5)

η

Efficiency

V

90

%

All Output Voltage Versions

Electrical Characteristics

Specifications with standard type face are for T

Range. Unless otherwise specified, V

and I

Symbol

Parameters

Conditions

Typ

Min

Max

Units

DEVICE PARAMETERS

I

Q

Quiescent Current

V

2.5

3.6

mA

For 3.3V, 5.0V, and ADJ Versions

V

2.5

mA

For 12V Versions

I

STBY

Standby Quiescent Current

ON/OFF Pin = 0V

50

100/150

µA

I

CL

Current Limit

1.55

1.25/1.2

2.1/2.2

A

I

L

Output Leakage Current

V

125

µA

V

V

615

mA

R

DS(ON)

Switch On-Resistance

I

0.25

0.30/0.50

Ω

f

O

Oscillator Frequency

Measured at Switch Pin

260

225

275

kHz

D

Maximum Duty Cycle

95

%

Minimum Duty Cycle

0

%

I

BIAS

Feedback Bias

V

85

nA

Current

ADJ Version Only

V

S/D

ON/OFF Pin

1.4

0.8

2.0

V

Voltage Thesholds

I

S/D

ON/OFF Pin Current

ON/OFF Pin = 0V

20

737

µA

F

SYNC

Synchronization Frequency

V

400

kHz

V

SYNC

Synchronization Threshold

Voltage

1.4

V

V

SS

Soft-Start Voltage

0.63

0.53

0.73

V

I

SS

Soft-Start Current

4.5

1.5

6.9

µA

θ

JA

Thermal Resistance

N Package, Junction to Ambient (Note 6)

95

˚C/W

M Package, Junction to Ambient (Note 6)

105

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.

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

Ω resistor into each pin.

Note 3: External components such as the catch diode, inductor, input and output capacitors, and voltage programming resistors can affect switching regulator

performance. When the LM2672 is used as shown in Figure 2 and Figure 3 test circuits, system performance will be as specified by the system parameters section

of the Electrical Characteristics.

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

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

Note 6: Junction to ambient thermal resistance with approximately 1 square inch of printed circuit board copper surrounding the leads. Additional copper area will

lower thermal resistance further. See Application Information section in the application note accompanying this datasheet and the thermal model in LM267X Made

Simple version 1.0 software.

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