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LT1307CN8

Single Cell Micropower 600kHz PWM DC/DC Converters

Linear Technology 

LT1307/LT1307B

ELECTRICAL CHARACTERISTICS

The q 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 = 1.1V, VSHDN = VIN, LT1307/LT1307B unless otherwise noted.

SYMBOL PARAMETER

CONDITIONS

MIN

TYP

MAX UNITS

IQ

Quiescent Current

VFB

Feedback Voltage

IB

FB Pin Bias Current (Note 3)

Reference Line Regulation

Minimum Input Voltage

VFB = 1.3V, Not Switching (LT1307) q

VFB = 1.3V, Not Switching (LT1307B) q

VSHDN = 0V

q

50

100

µA

1

1.8

mA

1

3

µA

q 1.195

1.22

1.245

V

VFB = VREF

1V ≤ VIN ≤ 2V (– 40°C)

1V ≤ VIN ≤ 2V (85°C)

2V ≤ VIN ≤ 5V

– 40°C

85°C

q 10

q

27

100

nA

0.6

1.1

%/V

3.2

%/V

0.3

0.8

%/V

1.1

1.2

V

0.8

1.0

V

Input Voltage Range

q

5

V

gm

Error Amp Transconductance

AV

Error Amp Voltage Gain

∆I = 5µA

– 40°C

85°C

q 25

35

65 µmhos

35

V/V

30

V/V

fOSC

Switching Frequency

Maximum Duty Cycle

– 40°C

85°C

q 500

600

750

kHz

80

84

%

75

80

%

Switch Current Limit (Note 4)

DC = 40%

DC = 75%

q

0.6

1.25

A

0.5

A

Switch VCESAT

Burst Mode Operation Switch Current Limit

(LT1307 Only)

ISW = 500mA, VIN = 1.2V (– 40°C)

ISW = 500mA (85°C)

L = 10µH

L = 22µH

250

350

mV

330

400

mV

100

mA

50

mA

Shutdown Pin Current

LBI Threshold Voltage

VSHDN = VIN

VSHDN = 0V

q

2.5

4.0

µA

q

– 1.5

– 2.5

µA

q 186

200

210

mV

LBO Output Low

LBO Leakage Current

LBI Input Bias Current (Note 5)

Low-Battery Detector Gain

ISINK = 10µA

VLBI = 250mV, VLBO = 5V

VLBI = 150mV

1MΩ Load (– 40°C)

1MΩ Load (85°C)

q

0.1

0.25

V

q

0.1

0.3

µA

q

5

30

nA

1000

6000

V/V

400

V/V

Switch Leakage Current

VSW = 5V

q

0.01

3

µA

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

of a device may be impaired.

Note 2: Specifications for commercial (C) grade devices are guaranteed

but not tested at – 20°C. MS8 package devices are designed for and

intended to meet commercial temperature range specifications but are not

tested at – 20°C or 0°C.

Note 3: Bias current flows into FB pin.

Note 4: Switch current limit guaranteed by design and/or correlation to

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

Note 5: Bias current flows out of LBI pin.

Note 6: The LT1307/LT1307B will withstand continuous application of

1.6V applied to the GND pin while VIN and SW are grounded.

1307fa

4

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