LT8625SP datasheet(3/39 Pages) AD

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PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Minimum PVIN

VSET = 1V

2.5

2.7

Minimum SVIN (Note 8)

VSET = 1V

2.5

2.7

SET Pin Current (ISET)

VSET = VOUTS = 1V

99.7

99.2

100

100.3

100.8

µA

Fast Start-Up Set Pin Current

SVIN = 12V, VSET = 1V

2.2

2.7

3.2

Start-Up Time (Notes 5, 11)

VOUT = 1V, CSET = 1μF, SVIN = 12V, VPGFB = 0.5

VOUT = 1V, CSET = 4.7μF, SVIN = 12V, VPGFB = 0.5

VOUT = 1V, CSET = 1μF, SVIN = 12V, RPGFB(TOP) = 49.9k, RPGFB(BOT) = 49.9k

VOUT = 1V, CSET = 4.7μF, SVIN = 12V, RPGFB(TOP) = 49.9k, RPGFB(BOT) = 49.9k

120

2.5

Output Noise Spectral Density (10kHz)

(Notes 5, 6, 7)

SVIN = 12V, VOUT = 1V, COUT = 22µF ×3, L = 180nH, RSET = 10kΩ, CSET = 4.7µF

fSW = 4MHz, RC = 4.99kΩ, CC = 1nF

nV/√Hz

Output RMS Noise (10Hz – 100kHz)

(Notes 5, 6, 7)

SVIN = 12V, VOUT = 1V, BW = 10Hz–100kHz, COUT = 22µF ×3, L = 180nH

RSET = 10kΩ, CSET = 4.7µF fSW = 4MHz, RC = 4.99kΩ, CC = 1nF

3.5

μVRMS

SVIN Quiescent Current

VEN/UVLO = 2V, Not Switching

VEN/UVLO = 0.2V, Shutdown

2.8

3.3

105

µA

Oscillator Frequency

RT = 392k

RT = 47k

RT = 18k

270

1.93

3.75

300

330

2.07

4.25

kHz

MHz

PGFB Upper Threshold

VPGFB Rising

529

537.5

546

PGFB Upper Threshold Hysteresis

PGFB Lower Threshold

VPGFB Falling

455

462.5

470

PGFB Lower Threshold Hysteresis

PGFB Pin Current

SVIN = 6V, VEN/UVLO = 3V, VPGFB = 0.5V

PG Leakage

VPG = 3.3V

–40

PG Pull-Down Resistance

VPG = 0.5V

380

1200

Ω

SYNC Threshold

SYNC DC and Clock Low Level Voltage

SYNC DC and Clock High Level Voltage

0.7

1.5

OUTS Pin Output Current

VOUTS = 1V

160

240

Output Voltage Line Regulation (Note 10) VSVIN = 4V to 18V

0.001 0.01

%/V

Error Amp Offset

(Notes 9, 10)

VC = 1.2V, VSET = 3V, SVIN = 6V, PNP-Based Input Pair

VC = 1.2V, VSET = 5V, SVIN = 5.5V, NPN-Based Input Pair

–2

Error Amp Transconductance

(Note 9)

VC = 1.2V, VSET = 1V, SVIN = 6V, PNP-Based Input Pair

VC = 1.2V, VSET = 5V, SVIN = 5.5V, NPN-Based Input Pair

9.5

7.8

11.5

13.5

12.2

Error Amp Gain

VC = 1.2V, VSET = 1V, SVIN = 6V

2800

V/V

VC Source Current

(Note 9)

VC = 1.2V, VSET = 1V, VOUTS = 0V, SVIN = 6V, PNP-Based Input Pair

VC = 1.2V, VSET = 5V, VOUTS = 4.7V, SVIN = 5.5V, NPN-Based Input Pair

330

µA

VC Sink Current

(Note 9)

VC = 1.2V, VSET = 1V, VOUTS = 2V, SVIN = 6V, PNP-Based Input Pair

VC = 1.2V, VSET = 5V, VOUTS = 5.3V, SVIN = 5.5V, NPN-Based Input Pair

330

µA

VC Pin to Switch Current Gain

11.5

A/V

VC Clamp Voltage

2.2

SVIN Current Consumption

RT = 47k, fSW =2MHz, SVIN = 6V

Minimum On-Time

ILOAD = 2A

Minimum Off-Time

ILOAD = 2A

Top Power N-Channel MOSFET

Current Limit

13.5

17.5

Bottom Power N-Channel MOSFET

Current Limit

9.25

11.5 13.75

SW Leakage Current

PVIN = 18V, VSW = 0V, 18V

–15

µA

LT8625SP/LT8625SP-1

Rev. C

For more information www.analog.com

ELECTRICAL CHARACTERISTICS The

denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C.

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