2

LT1931/LT1931A

1931fa

LT1931

LT1931A

PARAMETER

CONDITIONS

MIN

TYP

MAX

MIN

TYP

MAX

UNITS

Minimum Operating Voltage

2.45

2.6

2.45

2.6

V

Maximum Operating Voltage

16

16

V

Feedback Voltage

– 1.275 – 1.255 – 1.235

–1.275 –1.255 –1.235

V

●

– 1.280

– 1.230

–1.280

–1.230

V

NFB Pin Bias Current

●

48

8

16

µA

Quiescent Current

4.2

6

5.8

8

mA

Quiescent Current in Shutdown

0.01

1

0.01

1

µA

Reference Line Regulation

2.6V

0.01

0.05

0.01

0.05

%/V

Switching Frequency

1

1.2

1.4

1.8

2.2

2.6

MHz

●

0.85

1.6

1.6

2.9

MHz

Maximum Duty Cycle

●

84

90

75

82

%

Switch Current Limit

(Note 3)

1

1.2

2

1

1.2

2.5

A

400

600

400

600

mV

Switch Leakage Current

0.01

1

0.01

1

µA

SHDN Input Voltage, High

2.4

2.4

V

SHDN Input Voltage, Low

0.5

0.5

V

SHDN Pin Bias Current

16

32

35

70

µA

0

0.1

0

0.1

µA

(Note 1)

SW Voltage ................................................– 0.4V to 36V

NFB Voltage ............................................................. – 2V

Current Into NFB Pin ............................................

±1mA

SHDN Voltage .......................................................... 16V

Maximum Junction Temperature .......................... 125

°C

Operating Temperature Range (Note 2) .. – 40

°C to 85°C

Storage Temperature Range ................. – 65

°C to 150°C

Lead Temperature (Soldering, 10 sec).................. 300

°C

ABSOLUTE

AXI U

RATI GS

PACKAGE/ORDER I FOR ATIO

The

ELECTRICAL CHARACTERISTICS

Note 1: Absolute Maximum Ratings are those values beyond which the life

of a device may be impaired.

Note 2: The LT1931E/LT1931AE are guaranteed to meet performance

specifications from 0

°C to 70°C. Specifications over the –40°C to 85°C

operating temperature range are assured by design, characterization and

correlation with statistical process controls. LT1931I/LT1931AI are

guaranteed over the –40

°C to 85°C temperature range.

Note 3: Current limit guaranteed by design and/or correlation to static test.

ORDER PART NUMBER

S5 PART MARKING

Consult LTC Marketing for parts specified with wider operating temperature ranges.

LT1931ES5

LT1931AES5

LT1931IS5

LT1931AIS5

LTRA

LTSP

LTBZF

LTBZG

Order Options Tape and Reel: Add #TR

Lead Free: Add #PBF

Lead Free Tape and Reel: Add #TRPBF

Lead Free Part Marking: http://www.linear.com/leadfree/

SW 1

GND 2

TOP VIEW

S5 PACKAGE

5-LEAD PLASTIC TSOT-23

NFB 3

4 SHDN