3

LT1317/LT1317B

ELECTRICAL C

C

HARA TERISTICS

Commercial Grade

Industrial Grade

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Quiescent Current

q

160

µA

q

40

µA

q

7.5

mA

Feedback Voltage

q

1.20

1.26

V

FB Pin Bias Current (Note 2)

q

80

nA

Input Voltage Range

q

1.7

12

V

Error Amp Transconductance

∆I = 5µA

q

70

140

240

µmhos

Maximum Duty Cycle

q

80

%

Switch Current Limit (Note 3)

q

550

1350

mA

Switching Frequency

q

500

750

kHz

Shutdown Pin Current

q

0.1

µA

q

–7

µA

LBI Threshold Voltage

q

180

220

mV

LBO Output Low

q

0.25

V

LBO Leakage Current

q

0.1

µA

LBI Input Bias Current (Note 4)

q

60

nA

Switch Leakage Current

q

3

µA

q

400

mV

Reference Line Regulation

1.8V

q

0.15

%/V

SHDN Input Voltage High

q

1.4

6

V

SHDN Input Voltage Low

q

0.4

V

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Shutdown Pin Current

q

0.015

0.06

µA

q

– 2.3

– 6

µA

LBI Threshold Voltage

190

200

210

mV

q

180

200

220

mV

LBO Output Low

q

0.15

0.25

V

LBO Leakage Current

q

0.02

0.1

µA

LBI Input Bias Current (Note 4)

q

540

nA

Low-Battery Detector Gain

1M

Ω Load

2000

V/V

Switch Leakage Current

q

0.01

3

µA

300

350

mV

q

400

mV

Reference Line Regulation

1.8V

q

0.08

0.15

%/V

SHDN Input Voltage High

q

1.4

6

V

SHDN Input Voltage Low

q

0.4

V

Note 2: Bias current flows into FB pin.

Note 3: Switch current limit guaranteed by design and/or correlation to

static tests. Duty cycle affects current limit due to ramp generator.

Note 4: Bias current flows out of LBI pin.

temperature range.

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

of a device may be impaired.