LTC7841 datasheet(4/48 Pages) AD

4 / 48 page

LTC7841

Rev. 0

For more information www.analog.com

ELECTRICAL CHARACTERISTICS

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VBIAS

Input Supply Operating Voltage

Range

VBIAS Rising

4.5

VFB

Regulated Feedback Voltage

VOUT_COMMAND = 50%

VOUT_COMMAND = 25%

VOUT_COMMAND = 99.8%

1.188

0.590

2.371

1.2

0.6

2.395

1.212

0.610

2.419

Feedback Current

(Note 4)

±5

±50

VOUTSNS

VOUTSNS Leakage Pin Current

VOUT = 36V

VREFLNREG

Reference Voltage Line Regulation

(Note 4); VBIAS = 6V to 60V

0.002

0.01

%/V

VLOADREG

Output Voltage Load Regulation

(Note 4)

Measured in Servo Loop; ∆ITH Voltage = 1.2V to 0.7V

Measured in Servo Loop; ∆ITH Voltage = 1.2V to 1.6V

0.01

–0.01

0.1

–0.1

Transconductance Amplifier gm

(Note 4); ITH = 1.2V; Sink/Source 5µA

mmho

Input DC Supply Current

(Note 5)

Pulse Skip or Forced Continuous

Mode

RUN = 5V, VFB = 1.25V (No Load)

2.5

Sleep Mode

RUN = 5V, VFB = 1.25V (No Load)

0.800

1.5

Shutdown

RUN = 0V

µA

UVLO

INTVCC Undervoltage Lockout

Thresholds

INTVCC Ramping Up

INTVCC Ramping Down

3.5

4.1

3.8

4.4

SENSE+ Pin Current

VFB = 1.1V, ILIM = Float

200

300

µA

SENSE– Pin Current

VFB = 1.1V, ILIM = Float

±1

µA

ISS

Soft-Start Charge Current

VSS = 0V

µA

VRUN

RUN Pin ON Threshold

VRUN Rising

1.18

1.28

1.38

RUN Pin Hysteresis

100

RUN Pin Hysteresis Current

VRUN > 1.28V

4.5

µA

RUN Pin Current

VRUN < 1.28V

0.5

µA

∆VREF,ADJ

Maximum Reference Adjust Range

Set Point Accuracy

Resolution

LSB Step Size

MFR_VOUT_COMMAND = 0% to 99.8%

MFR_VOUT_COMMAND = 37.5% to 99.8%

–1

4.69

2.395

Bits

NL_ VOUT

DAC Nonlinearity

±1

LSB

IASEL

ASEL Programming Current

µA

ICSLEW

CSLEW Pull-Up Current

–10

µA

TINIT

Initialization Time

(Note 9)

SRMARGIN

Reference Slew Rate During Margin

Change

(see Note 8)

CSLEW = 470pF, Nominal SR mode

CSLEW = 470pF, Fast SR mode

CSLEW = 470pF, Slow SR mode

CSLEW = OPEN

CSLEW = INTVcc

0.8

1.6

0.1

%/ms

%/µs

VSENSE(MAX)

Maximum Current Sense Threshold

VFB = 1.1V, ILIM = 0

VFB = 1.1V, ILIM = FLOAT

VFB = 1.1V, ILIM = INTVCC

100

110

Matching Between VSENSE1(MAX) and

VSENSE2(MAX)

VFB = 1.1V, ILIM = INTVCC

VFB = 1.1V, ILIM = Float

VFB = 1.1V, ILIM = GND

–12

–10

–9

The l denotes the specifications which apply over the specified operating

temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, VRUN = 5V, EXTVCC = 0V unless otherwise noted. (Note 2)

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