LTC7103 datasheet(4/48 Pages) AD

4 / 48 page

LTC7871

Rev. 0

For more information www.analog.com

ELECTRICAL CHARACTERISTICS

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Main Control Loops

VHIGH

VHIGH Supply Voltage Range

100

VLOW

VLOW Supply Voltage Range

VHIGH > 6V

1.2

VLOW Regulated Feedback Voltage

(Note 4); ITHLOW Voltage = 1.5V

1.188

1.200

1.212

VHIGH Regulated Feedback Voltage

(Note 4); ITHHIGH Voltage = 0.5V

1.188

1.200

1.212

VLOW EA Feedback Current

(Note 4)

–10

–40

VHIGH EA Feedback Current

(Note 4)

–10

–40

Reference Voltage Line Regulation

(Note 4); VHIGH = 7V to 80V

0.02

0.2

VHIGH/VLOW Voltage Load Regulation Measured in Servo Loop, ∆ITH Voltage = 1.0V to 1.5V

Measured in Servo Loop, ∆ITH Voltage = 1.0V to 0.5V

0.01

–0.01

0.2

–0.2

gm–buck

Buck Mode Transconductance

Amplifier gm–buck

(Note 4) ITHLOW = 1.5V, Sink/Source 5µA

mmho

gm–boost

Boost Mode Transconductance

Amplifier gm–boost

(Note 4) ITHHIGH = 0.5V, Sink/Source 5µA

mmho

VHIGH DC Supply Current

Shutdown Mode, VHIGH Supply Current

Shutdown Mode, VLOW Supply Current

(Note 5)

VRUN = 0V; VHIGH = 48V

VRUN = 0V; VLOW = 12V

µA

UVLO

DRVCC Undervoltage Lockout

Threshold

DRVCC Ramping Down, VDRVSET = VV5

DRVCC Ramping Down, VDRVSET = Float

DRVCC Ramping Down, VDRVSET = 0V

6.9

4.8

3.9

7.2

5.0

4.1

7.5

5.2

4.3

DRVCC Undervoltage Hysteresis

VDRVSET = Float, VV5

VDRVSET = 0V

0.8

0.5

V5 Undervoltage Lockout Threshold

V5 Ramping Down, VDRVSET = Float, VV5

V5 Ramping Down, VDRVSET = 0V

4.2

3.9

4.4

4.1

4.6

4.3

V5 Undervoltage Hysteresis

VDRVSET = Float, VV5

VDRVSET = 0V

0.2

0.5

RUN Pin On Threshold

VRUN Rising

1.1

1.22

1.35

RUN Pin On Hysteresis

RUN Pin Source Current

VRUN < 1.1V

0.6

µA

RUN Pin Hysteresis Current

VRUN > 1.3V

µA

ISS

Soft-Start Charging Current

VSS = 1.2V

0.8

1.0

1.2

µA

BUCK Pin Input Threshold

VBUCK Rising

VBUCK Falling

2.2

1.7

BUCK Pin Pull-Up Resistance

BUCK Pin to V5

200

kΩ

Maximum Duty Cycle

Buck Mode

Boost Mode

Current Monitoring and Regulation Functions

ISNSA+

SNSA+ Pins Input Current

±0.05

±1

µA

ISNSD+

SNSD+ Pins Input Current

±0.05

±1

µA

ISNS–

SNS– Pins Input Current

ILIM Pin Input Resistance

100

kΩ

ISETCUR

SETCUR Pin Sourcing Current

MFR_IDAC_SETCUR = 0x00

15.0

16.0

17.0

µA

IMON Current Proportional to VLOW at

Max Current

VILIM = Float, RSENSE = 3mΩ

±10

IMON Zero Current Voltage

1.240

1.250

1.260

The l denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C, VHIGH = 48V, VRUN = 5V unless otherwise noted. (Note 2)

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