LT3045 datasheet(4/45 Pages) AD

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Data Sheet

LT83201

analog.com

Rev. A 4 of 45

SPECIFICATIONS

Table 1. Electrical Characteristics

(TJ = −40°C to +125°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

SET Pin Current (ISET)

ISET

VSET = VOUTS = 1V, TA = +25°C

99.85

100

100.15

μA

VSET = VOUTS = 1V

99.4

100

100.6

Fast Start-Up Set Pin

Current

IFAST_STARTUP

VIN = 12V, VSET = 1V, TA = +25°C

2.0

2.7

3.2

Start-Up Time Without

Fast Start-Up1,2

tSTARTUP

VOUT = 1V, CSET= 1μF, VIN = 12V,

VPGFB = 0.5V

VOUT = 1V, CSET= 4.7μF, VIN = 12V, VPGFB=

0.5V

120

Start-Up Time With Fast

Start-Up1,2

tSTARTUP

VOUT = 1V, CSET= 1μF, VIN = 12V,

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

VOUT = 1V, CSET= 4.7μF, VIN = 12V,

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

2.5

Output Noise Spectral

Density (10kHz) 1,3,4

VO,NSD(10kHz)

VIN = 12V, VOUT = 3.3V, COUT = 46.4 μF, L

= 0.82μH, RSET = 33.2kΩ, CSET = 1.1μF,

fSW= 6MHz, RC = 1.74kΩ, CC= 3.3nF

nV/√Hz

Output RMS Noise (10Hz

to 100kHz) 1,3,4

VO,RMS

VIN = 12V, VOUT = 3.3V, COUT = 46.4 μF, L

= 0.82μH, RSET = 33.2kΩ, CSET = 1.1μF,

fSW = 6MHz, RC = 1.74kΩ, CC = 3.3nF

2.08

μVRMS

VIN Quiescent Current

VEN/UVLO= 2V, Not Switching,

TA = +25°C

2.7

3.6

VEN/UVLO= 0.2V, Shutdown, TA = +25°C

μA

Oscillator Frequency

fSW

RT = 392kΩ

270

300

330

kHz

RT = 47.5kΩ

1.93

2.07

MHz

RT = 9.76kΩ

5.4

6.6

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

PGFB Lower Threshold

Hysteresis

VPGL_HYS

PGFB Lower Threshold

(Start-Up only)

VPGL_STARTUP VPGFB Rising

479

486.5

495

PGFB Pin Current

IPGFB

VEN/UVLO = 3V, VPGFB = 0.5V

PG Leakage

IPG_LKG

VPG= 3.3V, TA= +25°C

−40

PG Pull-Down

Resistance

RPG

VPG = 0.5V

380

1200

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