LM3500

SNVS231F – MAY 2004 – REVISED APRIL 2007

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Electrical Characteristics

LM3500-21.

Min

Typ

Max

Symbol

Parameter

Conditions

Units

(1)

(2)

(1)

Quiescent Current, Device Not

FB > 0.54V

0.95

1.2

Switching

mA

Quiescent Current, Device

FB = 0V

1.8

2.5

Switching

Shutdown

SHDN = 0V

0.1

2

µA

Feedback Voltage

0.47

0.5

0.53

V

Feedback Voltage Line

0.1

0.4

%/V

Regulation

Switch Current Limit (LM3500-

275

400

480

16)

Duty Cycle = 80%

255

400

530

Duty Cycle = 70%

mA

Switch Current Limit (LM3500-

420

640

770

21)

Duty Cycle = 70%

450

670

800

Duty Cycle = 63%

FB Pin Bias Current

45

200

nA

Input Voltage Range

2.7

7.0

V

0.43

Ω

1.1

2.3

Duty Cycle Limit (LM3500-16)

FB = 0V

80

87

%

Duty Cycle Limit (LM3500-21)

FB = 0V

85

94

Switching Frequency

0.85

1.0

1.15

MHz

SHDN = 5.5V

18

30

SHDN = 2.7V

9

16

µA

SHDN = GND

0.1

Switch Leakage Current

0.01

0.5

µA

(LM3500-16)

Switch Leakage Current

0.01

2.0

(LM3500-21)

UVP

Input Undervoltage Lockout

ON Threshold

2.4

2.5

2.6

V

OFF Threshold

2.3

2.4

2.5

OVP

Output Overvoltage Protection

ON Threshold

15

15.5

16

(LM3500-16)

OFF Threshold

14

14.6

15

V

Output Overvoltage Protection

ON Threshold

20

20.5

21

(LM3500-21)

OFF Threshold

19

19.5

20

260

400

16)

µA

300

460

21)

(1)

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

are production tested, guaranteed through statistical analysis or guaranteed by design. 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)

Feedback current flows out of the pin.

(4)

Current flows into the pin.

4

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