LM3500 datasheet(6/25 Pages) TI1

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LM3500

SNVS231F – MAY 2004 – REVISED APRIL 2007

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Specifications in standard type face are for TJ = 25°C and those in boldface type apply over the full Operating Temperature

Range (TJ = −40°C to +125°C). Unless otherwise specified VIN =2.7V and specification apply to both LM3500-16 and

LM3500-21.

Min

Typ

Max

Symbol

Parameter

Conditions

Units

(1)

(2)

(1)

Quiescent Current, Device Not

FB > 0.54V

0.95

1.2

Switching

Quiescent Current, Device

FB = 0V

1.8

2.5

Switching

Shutdown

SHDN = 0V

0.1

µA

VFB

Feedback Voltage

VIN = 2.7V to 7V

0.47

0.5

0.53

ΔVFB

Feedback Voltage Line

VIN = 2.7V to 7V

0.1

0.4

%/V

Regulation

ICL

Switch Current Limit (LM3500-

VIN = 3.0V, Duty Cycle = 70%

400

16)

Switch Current Limit (LM3500-

VIN = 3.0V, Duty Cycle = 63%

670

21)

FB Pin Bias Current

FB = 0.5V (3)

200

VIN

Input Voltage Range

2.7

7.0

RDSON

NMOS Switch RDSON

VIN = 2.7V, ISW = 300mA

0.43

Ω

PMOS Switch RDSON

VOUT = 6V, ISW = 300mA

1.1

2.3

DLimit

Duty Cycle Limit (LM3500-16)

FB = 0V

Duty Cycle Limit (LM3500-21)

FB = 0V

FSW

Switching Frequency

0.8

1.0

1.2

MHz

ISD

SHDN Pin Current (4)

SHDN = 5.5V

SHDN = 2.7V

µA

SHDN = GND

0.1

Switch Leakage Current

VSW = 15V

0.01

0.5

µA

(LM3500-16)

Switch Leakage Current

VSW = 20V

0.01

2.0

(LM3500-21)

UVP

Input Undervoltage Lockout

ON Threshold

2.4

2.5

2.6

OFF Threshold

2.3

2.4

2.5

OVP

Output Overvoltage Protection

ON Threshold

15.5

(LM3500-16)

OFF Threshold

14.6

Output Overvoltage Protection

ON Threshold

20.5

(LM3500-21)

OFF Threshold

19.5

IVout

VOUT Bias Current (LM3500-

VOUT = 15V, SHDN = VIN

260

400

16)

µA

VOUT Bias Current (LM3500-

VOUT = 20V, SHDN = VIN

300

460

21)

IVL

PMOS Switch Leakage

VOUT = 15V, VSW = 0V

0.01

Current (LM3500-16)

µA

PMOS Switch Leakage

VOUT = 20V, VSW = 0V

0.01

Current (LM3500-21)

SHDN

SHDN Low

0.65

0.3

Threshold

SHDN High

1.1

0.65

(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.

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