LTC3890 datasheet(4/34 Pages) LINER

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LTC3807

3807fa

For more information www.linear.com/LTC3807

ELECTRICAL CHARACTERISTICS The

denotes the specifications which apply over the specified

operating junction temperature range, otherwise specifications are at TA = 25°C (Note 2), VIN = 12V, VRUN = 5V, EXTVCC = 0V unless

otherwise noted.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Gate Driver

TG Pull-Up On-Resistance

TG Pull-Down On-Resistance

2.5

1.5

BG Pull-Up On-Resistance

BG Pull-Down On-Resistance

2.4

1.1

TG Transition Time:

Rise Time

Fall Time

(Note 6)

CLOAD = 3300pF

BG Transition Time:

Rise Time

Fall Time

(Note 6)

CLOAD = 3300pF

Top Gate Off to Bottom Gate On Delay

Synchronous Switch-On Delay Time

CLOAD = 3300pF

Bottom Gate Off to Top Gate On Delay

Top Switch-On Delay Time

CLOAD = 3300pF

tON(MIN)

Minimum On-Time

(Note 7)

INTVCC Linear Regulator

Internal VCC Voltage

6V < VIN < 38V, VEXTVCC = 0V

4.85

5.1

5.35

INTVCC Load Regulation

ICC = 0mA to 50mA, VEXTVCC = 0V

0.7

1.1

Internal VCC Voltage

6V < VEXTVCC < 13V

4.85

5.1

5.35

INTVCC Load Regulation

ICC = 0mA to 50mA,

VEXTVCC = 8.5V

0.6

1.1

EXTVCC Switchover Voltage

ICC = 0mA to 50mA,

EXTVCC Ramping Positive

4.5

4.7

4.9

EXTVCC Hysteresis

250

Oscillator and Phase-Locked Loop

Programmable Frequency

RFREQ = 25k;

PLLIN/MODE = DC Voltage

105

kHz

Programmable Frequency

RFREQ = 65k;

PLLIN/MODE = DC Voltage

375

440

505

kHz

Programmable Frequency

RFREQ =105k;

PLLIN/MODE = DC Voltage

835

kHz

Low Fixed Frequency

VFREQ = 0V;

PLLIN/MODE = DC Voltage

320

350

380

kHz

High Fixed Frequency

VFREQ = INTVCC;

PLLIN/MODE = DC Voltage

485

535

585

kHz

Synchronizable Frequency

PLLIN/MODE = External Clock

750

kHz

PGOOD Output

PGOOD Voltage Low

IPGOOD = 2mA

0.2

0.4

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