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LT1308ACFTR

High Current, Micropower Single Cell, 600kHz DC/DC Converters

Linear Technology 

LT1308A/LT1308B

ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature

range, otherwise specifications are at TA = 25°C. Commercial Grade 0°C to 70°C. VIN = 1.1V, VSHDN = VIN, unless otherwise noted.

SYMBOL PARAMETER

CONDITIONS

MIN TYP MAX UNITS

IQ

Quiescent Current

VFB

Feedback Voltage

IB

FB Pin Bias Current

Reference Line Regulation

Minimum Input Voltage

Not Switching, LT1308A

Switching, LT1308B

VSHDN = 0V (LT1308A/LT1308B)

(Note 3)

1.1V ≤ VIN ≤ 2V

2V ≤ VIN ≤ 10V

140

240

μA

2.5

4

mA

0.01

1

μA

l 1.20 1.22 1.24

V

l

27

80

nA

l

0.03

0.4

%/V

0.01

0.2

%/V

0.92

1

V

gm

Error Amp Transconductance

AV

Error Amp Voltage Gain

fOSC

Switching Frequency

Maximum Duty Cycle

∆I = 5μA

VIN = 1.2V

60

μmhos

100

V/V

l 500

600

700

kHz

l 82

90

%

Switch Current Limit

Duty Cycle = 30% (Note 4)

2

3

4.5

A

Switch VCESAT

Burst Mode Operation Switch Current Limit

(LT1308A)

ISW = 2A (25°C, 0°C), VIN = 1.5V

ISW = 2A (70°C), VIN = 1.5V

VIN = 2.5V, Circuit of Figure 1

290

350

mV

330

400

mV

400

mA

Shutdown Pin Current

LBI Threshold Voltage

VSHDN = 1.1V

VSHDN = 6V

VSHDN = 0V

l

2

5

μA

l

20

35

μA

l

0.01

0.1

μA

196

200

204

mV

l 194

200

206

mV

LBO Output Low

LBO Leakage Current

LBI Input Bias Current (Note 5)

Low-Battery Detector Gain

ISINK = 50μA

VLBI = 250mV, VLBO = 5V

VLBI = 150mV

l

0.1 0.25

V

l

0.01

0.1

μA

33

100

nA

3000

V/V

Switch Leakage Current

VSW = 5V

l

0.01

10

μA

The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.

Industrial Grade –40°C to 85°C. VIN = 1.2V, VSHDN = VIN, unless otherwise noted.

SYMBOL PARAMETER

CONDITIONS

MIN TYP MAX UNITS

IQ

Quiescent Current

VFB

Feedback Voltage

Not Switching, LT1308A

Switching, LT1308B

VSHDN = 0V (LT1308A/LT1308B)

l

140

240

μA

l

2.5

4

mA

l

0.01

1

μA

l 1.19 1.22 1.25

V

IB

FB Pin Bias Current

(Note 3)

l

27

80

nA

Reference Line Regulation

Minimum Input Voltage

1.1V ≤ VIN ≤ 2V

2V ≤ VIN ≤ 10V

l

0.05

0.4

%/V

l

0.01

0.2

%/V

0.92

1

V

gm

Error Amp Transconductance

∆I = 5μA

60

μmhos

AV

Error Amp Voltage Gain

100

V/V

1308abfb

3

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