LTC3412

3

3412fc

For more information www.linear.com/LTC3412

ELECTRICAL CHARACTERISTICS

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 LTC3412E is 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 LTC3412I is guaranteed to meet

specified performance over the –40°C to 85°C temperature range.

SYMBOL PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

SVIN

Signal Input Voltage Range

2.625

5.5

V

VFB

Regulated Feedback Voltage

(Note 3)

l

0.784

0.800

0.816

V

IFB

Voltage Feedback Leakage Current

0.1

0.4

µA

∆VFB

Reference Voltage Line Regulation

VIN = 2.7V to 5.5V (Note 3)

l

0.04

0.2

%V

VLOADREG Output Voltage Load Regulation

Measured in Servo Loop, VITH = 0.36V

Measured in Servo Loop, VITH = 0.84V

l

l

0.02

–0.02

0.2

–0.2

%

%

∆VPGOOD Power Good Range

±7.5

±9

%

RPGOOD

Power Good Pull-Down Resistance

120

200

Ω

IQ

Input DC Bias Current

Active Current

Sleep

Shutdown

(Note 4)

VFB = 0.78V, VITH = 1V

VFB = 1V, VITH = 0V

VRUN = 0V, VMODE = 0V

250

62

0.02

330

80

1

µA

µA

µA

fOSC

Switching Frequency

Switching Frequency Range

ROSC = 309kΩ

(Note 6)

0.88

0.3

0.95

1.1

4

MHz

MHz

fSYNC

SYNC Capture Range

(Note 6)

0.3

4

MHz

RPFET

RDS(ON) of P-Channel FET

ISW = 1A (Note 7)

85

110

mΩ

RNFET

RDS(ON) of N-Channel FET

ISW = –1A (Note 7)

65

90

mΩ

ILIMIT

Peak Current Limit

4

5.4

A

VUVLO

Undervoltage Lockout Threshold

2.375

2.500

2.625

V

ILSW

SW Leakage Current

VRUN = 0V, VIN = 5.5V

0.1

1

µA

VRUN

RUN Threshold

0.5

0.65

0.8

V

IRUN

RUN/SS Leakage Current

1

µA

The ● denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. VIN = 3.3V unless otherwise specified.

Note 3: The LTC3412 is tested in a feedback loop that adjusts VFB to

achieve a specified error amplifier output voltage (ITH).

Note 4: Dynamic supply current is higher due to the internal gate charge

being delivered at the switching frequency.

Note 5: TJ is calculated from the ambient temperature TA and power

dissipation as follows: LTC3412: TJ = TA + PD (37.6°C/W).

Note 6: 4MHz operation is guaranteed by design and not production tested.

Note 7: Switch on resistance is guaranteed by design and test correlation

in the UF package and by production test in the FE package.