LM3224

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SNVS277B – DECEMBER 2004 – REVISED SEPTEMBER 2005

Electrical Characteristics

Min

Typ

Max

Symbol

Parameter

Conditions

Units

(1)

(2)

(1)

Quiescent Current

FB = 2V (Not Switching)

1.3

2.0

mA

0.1

2.0

µA

Feedback Voltage

1.2285

1.26

1.2915

V

(3)

Switch Current Limit

(4)

1.9

2.45

2.8

2.1

A

2.2

Feedback Voltage Line

2.7V

0.085

0.15

%/V

Regulation

35

250

nA

SS Pin Current

7.5

11

13

µA

SS Pin Voltage

1.2090

1.2430

1.2622

Input Voltage Range

2.7

7

V

Error Amp Transconductance

ΔI = 5µA

40

87

135

µmho

Error Amp Voltage Gain

78

V/V

Maximum Duty Cycle

85

92.5

%

Switching Frequency

FSLCT = Ground

450

615

750

kHz

0.9

1.25

1.5

MHz

Shutdown Pin Current

2.4

5.0

µA

0.3

1.2

Switch Leakage Current

0.2

8.0

µA

0.15

0.4

Ω

Shutdown Threshold

Output High

1.2

0.8

V

Output Low

0.8

0.3

V

UVP

On Threshold

2.3

2.5

V

Off Threshold

2.6

2.7

V

(1)

All limits guaranteed at room temperature (standard typeface) and at temperature extremes (bold typeface). 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).

(2)

Typical numbers are at 25°C and represent the most likely norm.

(3)

Duty cycle affects current limit due to ramp generator.

(4)

(5)

Bias current flows into FB pin.

Copyright © 2004–2005, Texas Instruments Incorporated

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