LT8705MPFE#PBF datasheet(4/44 Pages) LINER

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LT8705

8705fe

For more information www.linear.com/LT8705

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Gain from VC to Maximum Current Sense Voltage

(VCSP-VCSN) (A5 in the Block Diagram)

Boost Mode

Buck Mode

150

–150

mV/V

SHDN Input Voltage High

SHDN Rising to Enable the Device

1.184 1.234 1.284

SHDN Input Voltage High Hysteresis

SHDN Input Voltage Low

Device Disabled, Low Quiescent Current

(LT8705E, LT8705I)

(LT8705H, LT8705MP)

0.35

0.3

SHDN Pin Bias Current

VSHDN = 3V

VSHDN = 12V

µA

SWEN Rising Threshold Voltage (Note 5)

1.156 1.206 1.256

SWEN Threshold Voltage Hysteresis (Note 5)

MODE Pin Forced Continuous Mode Threshold

0.4

MODE Pin Burst Mode Range

1.0

1.7

MODE Pin Discontinuous Mode Threshold

2.3

Soft-Start Charging Current

VSS = 0.5V

µA

Soft-Start Discharge Current

VSS = 0.5V

9.5

µA

Voltage Regulator Loops (Refer to Block Diagram to Locate Amplifiers)

Regulation Voltage for FBOUT

VC = 1.2V (LT8705E, LT8705I)

VC = 1.2V (LT8705H, LT8705MP)

1.193

1.191

1.207

1.222

Regulation Voltage for FBIN

VC = 1.2V (LT8705E, LT8705I)

VC = 1.2V (LT8705H, LT8705MP)

1.184

1.182

1.205

1.226

Line Regulation for FBOUT and FBIN Error Amp Reference

Voltage

VIN = 12V to 80V; Not Switching

0.002 0.005

%/V

FBOUT Pin Bias Current

Current Out of Pin

FBOUT Error Amp EA4 gm

315

µmho

FBOUT Error Amp EA4 Voltage Gain

220

V/V

FBIN Pin Bias Current

Current Out of Pin

FBIN Error Amp EA3 gm

130

µmho

FBIN Error Amp EA3 Voltage Gain

V/V

SRVO_FBIN Activation Threshold (Note 5)

(VFBIN Falling) – (Regulation Voltage for FBIN),

VFBOUT = VIMON_IN = VIMON_OUT = 0V

SRVO_FBIN Activation Threshold Hysteresis (Note 5)

VFBOUT = VIMON_IN = VIMON_OUT = 0V

SRVO_FBOUT Activation Threshold (Note 5)

(VFBOUT Rising) – (Regulation Voltage for FBOUT),

VFBIN = 3V, VIMON_IN = VIMON_OUT = 0V

–37

–29

–21

SRVO_FBOUT Activation Threshold Hysteresis (Note 5)

VFBIN = 3V, VIMON_IN = 0V, VIMON_OUT = 0V

SRVO_FBIN, SRVO_FBOUT Low Voltage (Note 5)

I = 100μA

110

330

SRVO_FBIN, SRVO_FBOUT Leakage Current (Note 5)

VSRVO_FBIN = VSRVO_FBOUT = 2.5V

µA

Current Regulation Loops (Refer to Block Diagram to Locate Amplifiers)

Regulation Voltages for IMON_IN and IMON_OUT

VC = 1.2V

1.187 1.208 1.229

Line Regulation for IMON_IN and IMON_OUT Error Amp

Reference Voltage

VIN = 12V to 80V; Not Switching

0.002 0.005

%/V

CSPIN, CSNIN Bias Current

BOOST Capacitor Charge Control Block Not Active

ICSPIN + ICSNIN, VCSPIN = VCSNIN = 12V

µA

elecTrical characTerisTics The

denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, SHDN = 3V unless otherwise noted. (Note 3)

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