LTC7803 datasheet(5/42 Pages) AD

5 / 42 page

LTC7811

Rev. 0

For more information www.analog.com

ELECTRICAL CHARACTERISTICS The

indicates specifications which apply over the specified operating

junction temperature range, otherwise specifications are for TA = 25°C, VBIAS = 12V, RUN1,2,3>1.25V, EXTVCC = 0V, VPRG3 = FLOAT

unless otherwise noted. (Note 2)

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Sleep Mode Current (Note 3)

Only Channel 1 On

VSENSE1– ≥ 3.2V

VBIAS Current, EXTVCC = 0V

VBIAS Current, EXTVCC = 4.8V

EXTVCC Current, EXTVCC ≥ 4.8V

SENSE1– Current

µA

Sleep Mode Current (Note 3)

All Channels On

VSENSE1– ≥ 3.2V, EXTVCC ≥4.8V

VBIAS Current

EXTVCC Current

SENSE1– Current

µA

Pulse-Skipping or Forced Continuous Mode

VBIAS or EXTVCC Current (Note 3)

One Channel On

All Channels On

1.5

Gate Drivers

TG or BG On-Resistance

Pull-up

Pull-down

2.0

1.0

TG or BG Transition Time

Rise Time

Fall Time

(Note 6)

CLOAD = 3300pF

TG Off to BG On Delay

Synchronous Switch-On Delay Time

CLOAD = 3300pF Each Driver

Bucks (Channels 1, 2)

BG Off to TG On Delay

Top Switch-On Delay Time

CLOAD = 3300pF Each Driver

Bucks (Channels 1, 2)

tON(MIN)1,2

Buck TG Minimum On-Time

(Note 7)

tON(MIN)3

Boost BG Minimum On-Time

(Note 7)

Maximum Duty Factor for TG

Bucks (Channels 1,2), FREQ = 0V

Maximum Duty Factor for BG

Bucks (Channels 1,2) in Overvoltage

Boost (Channel 3), FREQ = 0V

100

IMON3 Current Monitor Output Voltage

VSENSE3+ = 12V, VSENSE3+ − VSENSE3– = 50mV

VSENSE3+ = 12V, VSENSE3+ − VSENSE3– = 15mV

1.3

0.6

1.4

0.7

1.5

0.8

INTVCC Low Dropout (LDO) Linear Regulator

INTVCC Regulation Point

4.9

5.1

5.3

INTVCC Load Regulation

ICC = 0mA to 100mA, VBIAS ≥ 6V

ICC = 0mA to 100mA, VEXTVCC ≥ 6V

1.2

EXTVCC LDO Switchover Voltage

EXTVCC Rising

4.5

4.7

4.8

EXTVCC Switchover Hysteresis

250

UVLO

Undervoltage Lockout

INTVCC Rising

INTVCC Falling

4.10

3.75

4.20

3.85

4.35

4.00

Spread Spectrum Oscillator and Phase-Locked Loop

fOSC

Low Fixed Frequency

VFREQ = 0V, PLLIN/SPREAD = 0V

330

380

430

kHz

High Fixed Frequency

VFREQ = INTVCC, PLLIN/SPREAD = 0V

2.0

2.25

2.5

MHz

Programmable Frequency

RFREQ = 374kΩ, PLLIN/SPREAD = 0V

RFREQ = 75kΩ, PLLIN/SPREAD = 0V

RFREQ = 12kΩ, PLLIN/SPREAD = 0V

450

100

500

550

kHz

MHz

Synchronizable Frequency Range

PLLIN/SPREAD = External Clock

0.1

MHz

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