LTC7897 datasheet(4/53 Pages) AD

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Data Sheet

LTC7897

analog.com

Rev. A

4 of 53

SPECIFICATIONS

Table 1. Electrical Characteristics

(Specifications are for TJ = -40°C to +150°C for the minimum and maximum values, TA = 25°C for the typical

values, VIN = 12V, RUN = 12V, VPRG = floating, EXTVCC = 0V, DRVSET = 0V, DRVUV = 0V, TGUP = TGDN = TGxx, BGUP

= BGDN = BGxx, and DTCA and DTCB = 0V, unless otherwise noted.)

PARAMETER

SYMBOL

CONDITIONS/COMMENTS

MIN

TYP

MAX

UNITS

Input Supply (VIN)

Input Supply

Operating Range

VIN

135

Input Supply Current

in Regulation

IVIN

48V to 5V, no load1

14V to 3.3V, no load1

μA

Controller Operation

Regulated Output

Voltage Set Point

VOUT

0.8

135

Regulated Feedback

Voltage2

VFB

VIN = 4V to 135V,

ITH Voltage = 0.6V to 1.2V

VPRG = floating, TA = 25°C

VPRG = floating

VPRG = 0V

VPRG = INTVCC

0.792

0.788

4.890

11.73

0.8

5.0

0.808

0.812

5.110

12.27

Feedback Current2

VPRG = floating, TA = 25°C

VPRG = 0V or INTVCC, TA = 25°C

-50

+50

µA

Feedback Overvoltage

Threshold

Relative to VFB, TA = 25°C

Transconductance

Amplifier gm2

ITH = 1.2V, Sink and Source = 5μA

1.8

mMho

Maximum Current

Sense Threshold

VSENSE(MAX)

VFB = 0.7V, SENSE− = 3.3V

ILIM = 0V

ILIM = floating

ILIM = INTVCC

SENSE+ Pin Current

ISENSE+

SENSE+ = 3.3V, TA = 25°C

-1

μA

SENSE− Pin Current

ISENSE−

SENSE− < 3V

3.2V ≤ SENSE− < INTVCC – 0.5V

SENSE− > INTVCC + 0.5V

700

μA

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