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LT1934IS6

Micropower Step-Down Switching Regulators in ThinSOT and DFN

Linear Technology 

LT1934/LT1934-1

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

temperature range, otherwise specifications are at TA = 25°C. VIN = 10V, VBOOST = 15V, unless otherwise noted.

SYMBOL

CONDITIONS

MIN TYP

MAX

UNITS

Undervoltage Lockout

Quiescent Current

–40°C ≤ TA ≤ 85°C

l

–40°C ≤ TA ≤ 125°C

l

VFB = 1.3V

–40°C ≤ TA ≤ 85°C

l

–40°C ≤ TA ≤ 125°C

l

VSHDN = 0V

3

3.2

V

3

3.6

V

3

3.6

V

12

22

μA

12

26

μA

12

26

μA

0.01

2

μA

FB Comparator Trip Voltage

FB Comparator Hysteresis

VFB Falling

–40°C ≤ TA ≤ 85°C

–40°C ≤ TA ≤ 125°C

l 1.22 1.25

1.27

V

l 1.21 1.25

1.27

V

10

mV

FB Pin Bias Current

FB Voltage Line Regulation

Switch Off Time

Maximum Duty Cycle

Switch VCESAT

Switch Current Limit

VFB = 1.25V

–40°C ≤ TA ≤ 85°C

–40°C ≤ TA ≤ 125°C

4V < VIN < 34V

VFB > 1V

VFB = 0V

VFB = 1V

–40°C ≤ TA ≤ 85°C

–40°C ≤ TA ≤ 125°C

ISW = 300mA (LT1934, S6 Package)

ISW = 300mA (LT1934, DCB Package)

ISW = 75mA (LT1934-1, S6 Package)

ISW = 75mA (LT1934-1, DCB Package)

LT1934

LT1934-1

l

2

±15

nA

l

2

±60

nA

0.007

%/V

1.4

1.8

2.3

μs

12

μs

l 85

88

%

l 83

88

%

200

300

mV

225

mV

65

120

mV

70

mV

350

400

490

mA

90

120

160

mA

BOOST Pin Current

Minimum Boost Voltage (Note 3)

Switch Leakage Current

SHDN Pin Current

SHDN Input Voltage High

SHDN Input Voltage Low

ISW = 300mA (LT1934)

ISW = 75mA (LT1934-1)

ISW = 300mA (LT1934)

ISW = 75mA (LT1934-1)

VSHDN = 2.3V

VSHDN = 34V

8.5

12

mA

6.0

10

mA

1.8

2.5

V

1.7

2.5

V

2

μA

0.5

μA

1.5

5

μA

2.3

V

0.25

V

Note 1: Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

Note 2: The LT1934E and LT1934E-1 are guaranteed to meet performance

specifications from 0°C to 85°C. Specifications over the –40°C to 85°C

operating temperature range are assured by design, characterization and

correlation with statistical process controls. The LT1934I and LT1934I-1

specifications are guaranteed over the –40°C to 125°C temperature range.

Note 3: This is the minimum voltage across the boost capacitor needed to

guarantee full saturation of the internal power switch.

1934fe

3

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