LT1949 datasheet(2/8 Pages) LINER

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LT1949

VIN, LBO Voltage ..................................................... 12V

SW Voltage ............................................... – 0.4V to 30V

FB Voltage .................................................... VIN + 0.3V

VC Voltage ................................................................ 2V

LBI Voltage ............................................ 0V

≤ VLBI ≤ 1V

SHDN Voltage ........................................................... 6V

(Note 1)

LT1949EMS8

LTJC

Consult factory for Military grade parts.

SHDN

GND

LBO

LBI

VIN

TOP VIEW

MS8 PACKAGE

8-LEAD PLASTIC MSOP

TJMAX = 125°C, θJA = 120°C/W

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

°C

Operating Temperature Range (Note 2)

LT1949EMS8 .......................................–40

°C to 85°C

LT1949ES8/LT1949IS8 .......................–40

°C to 85°C

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

°C to 150°C

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

°C

ORDER PART

NUMBER

LT1949ES8

LT1949IS8

S8 PART MARKING

1949E

1949I

TOP VIEW

LBO

LBI

VIN

SHDN

GND

S8 PACKAGE

8-LEAD PLASTIC SO

TJMAX = 125°C, θJA = 120°C/W

ORDER PART

NUMBER

MS8 PART MARKING

The q denotes specifications which apply over the full operating

temperature range, otherwise specifications are TA = 25°C. VIN = 2V, VSHDN = 2V unless otherwise noted.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Quiescent Current

4.5

7.5

VSHDN = 0V

µA

VFB

Feedback Voltage

1.22

1.24

1.26

1.20

1.24

1.26

FB Pin Bias Current (Note 3)

Input Voltage Range

1.7

Error Amp Transconductance

∆I = 5µA

140

240

µmhos

Error Amp Voltage Gain

700

V/V

Maximum Duty Cycle

Switch Current Limit (Note 4)

VIN = 2.5V, Duty Cycle = 30%

1.13

1.5

VIN = 2.5V, Duty Cycle = 30%

0.95

1.5

fOSC

Switching Frequency

500

600

750

kHz

Shutdown Pin Current

VSHDN = VIN

0.015

0.1

µA

VSHDN = 0V

– 2.3

– 7

µA

LBI Threshold Voltage

190

200

210

180

200

220

LBO Output Low

ISINK = 10µA

0.15

0.25

LBO Leakage Current

VLBI = 250mV, VLBO = 5V

0.02

0.1

µA

LBI Input Bias Current (Note 5)

VLBI = 150mV

560

Low-Battery Detector Gain

Ω Pull-Up

2000

V/V

Switch Leakage Current

VSW = 5V

0.01

µA

PACKAGE/ORDER I FOR ATIO

ABSOLUTE

AXI U

RATI GS

ELECTRICAL CHARACTERISTICS

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