LT8625SP datasheet(4/44 Pages) AD

4 / 44 page

Data Sheet

LT83401/LT83402

analog.com

Rev. 0

4 of 44

SPECIFICATIONS

Table 1. Electrical Characteristics

(TJ = -40°C to +150°C, unless otherwise noted. Typical values are at TA = +25°C. All voltages are referenced to GND,

unless otherwise noted.)

PARAMETER

SYMBOL

CONDITIONS/COMMENTS

MIN

TYP

MAX

UNITS

Minimum VIN

VIN

VSET = 1V

2.5

2.8

OUTS, SET Operating

Voltage

VOUTS, VSET

SET Pin Current (ISET)

ISET

VSET = VOUTS = 1V

99.2

100

100.8

μA

Fast Start-Up Set Pin

Current

IFAST_STARTUP

VIN = 12V, VSET = 1V, TA = +25°C

1.9

2.5

3.1

Start-Up Time Without

Fast Start-Up1,2

tSTARTUP

VOUT = 1V, CSET= 1μF, VIN= 12V,

VPGFB = 0.5V

29.4

VOUT= 1V, CSET= 4.7μF, VIN= 12V,

VPGFB = 0.5V

127.8

Start-Up Time With Fast

Start-Up1,2

tSTARTUP

VOUT= 1V, CSET = 1μF, VIN = 12V,

RPGFB(TOP) = 49.9kΩ, RPGFB(BOT) = 49.9kΩ

0.5

VOUT= 1V, CSET = 4.7μF, VIN= 12V,

RPGFB(TOP) = 49.9kΩ, RPGFB(BOT) = 49.9kΩ

Output Noise Spectral

Density (10kHz)1,3,4

VO,NSD(10kHz)

VIN = 12V, VOUT = 3.3V, COUT = 88μF,

L = 2.2μH, RSET = 33.2kΩ, CSET = 4.7μF,

fSW = 6MHz, RC = 2.7kΩ, CC = 1nF

nV/√Hz

Output Root Mean

Square (RMS) Noise

(10Hz–100kHz)1,3,4

VO,RMS

VIN = 12V, VOUT = 3.3V, BW = 10Hz to

100kHz, COUT = 88μF, L = 2.2μH,

RSET = 3.3kΩ, CSET= 4.7μF, fSW = 6MHz,

RC = 2.7kΩ, CC = 1nF

2.8

μVRMS

VIN Quiescent Current

VEN/UVLO = 2V, not switching,

TA = +25°C

3.6

VEN/UVLO = 0.2V, shutdown, TA = +25°C

μA

Oscillator Frequency

fSW

RT = 392kΩ

285

315

345

kHz

RT = 47.5kΩ

1.95

2.05

MHz

RT = 9.76kΩ

5.04

5.6

6.16

Power Good Feedback

(PGFB) Upper Threshold

VPGH

VPGFB rising

529

537.5

546

PGFB Upper Threshold

Hysteresis

VPGH_HYS

PGFB Lower Threshold

VPGL

VPGFB falling

455

462.5

470

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