LTC7891 datasheet(3/36 Pages) AD

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Data Sheet

LTC7891

SPECIFICATIONS

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Rev. 0 | 3 of 36

ELECTRICAL CHARACTERISTICS

TJ = −40°C to +150°C for the minimum and maximum values, TA = 25°C for the typical values, VIN = 12 V, RUN = 12 V, VPRG = floating,

EXTVCC = 0 V, DRVSET = 0 V, DRVUV = 0 V, TGUP = TGDN = TGxx, BGUP = BGDN = BGxx, and DTCA and DTCB = 0 V, unless otherwise

noted.

Table 1. Electrical Characteristics

Parameter

Symbol

Test Conditions/Comments

Min

Typ

Max

Unit

INPUT SUPPLY

Input Supply Operating Range

VIN

100

Total Input Supply Current in Regulation

IVIN

48 V to 5 V, no load1

μA

14 V to 3.3 V, no load1

μA

CONTROLLER OPERATION

Regulated Output Voltage Set Point

VOUT

0.8

Regulated Feedback Voltage 2

VFB

VIN = 4 V to 100 V, ITH voltage = 0.6 V to 1.2 V

VPRG = floating, TA = 25°C

0.792

0.8

0.808

VPRG = floating

0.788

0.8

0.812

VPRG = 0 V

4.925

5.0

5.075

VPRG = INTVCC

11.82

12.18

Feedback Current2

VPRG = floating, TA = 25°C

−50

+50

VPRG = 0 V or INTVCC, TA = 25°C

µA

Feedback Overvoltage Threshold

Relative to VFB, TA = 25°C

Transconductance Amplifier2

ITH = 1.2 V, sink and source current = 5 μA

1.8

mMho

Maximum Current Sense Threshold

VSENSE(MAX) VFB = 0.7 V, SENSE− = 3.3 V

ILIM = 0 V

ILIM = floating

ILIM = INTVCC

SENSE+ Pin Current

ISENSE+

SENSE+ = 3.3 V, TA = 25°C

−1

μA

SENSE− Pin Current

ISENSE−

SENSE− < 3 V

μA

3.2 V ≤ SENSE– < INTVCC – 0.5 V

μA

SENSE– > INTVCC + 0.5 V

725

μA

Soft Start Charge Current

TRACK/SS = 0 V

9.5

14.5

μA

RUN Pin On Threshold

RUN rising

1.15

1.20

1.25

RUN Pin Hysteresis

120

DC SUPPLY CURRENT

VIN Shutdown Current

RUN = 0 V

μA

VIN Sleep Mode Current

SENSE− < 3.2 V, EXTVCC = 0 V

µA

Sleep Mode Current3

VIN current, SENSE– ≥ 3.2 V, EXTVCC = 0 V

µA

VIN current, SENSE– ≥ 3.2 V, EXTVCC ≥ 4.8 V

µA

EXTVCC current, SENSE– ≥ 3.2 V, EXTVCC ≥ 4.8 V

µA

SENSE– current, SENSE– ≥ 3.2 V

µA

Pulse Skipping (PS) or Forced Continuous Mode

(FCM), VIN or EXTVCC Current3

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