LTC7891 datasheet(4/36 Pages) AD

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Data Sheet

LTC7891

SPECIFICATIONS

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Rev. 0 | 4 of 36

Table 1. Electrical Characteristics

Parameter

Symbol

Test Conditions/Comments

Min

Typ

Max

Unit

GATE DRIVERS

TGxx or BGxx On-Resistance

DRVSET = INTVCC

Pull-Up

2.0

Pull-Down

1.0

BOOST to DRVCC Switch On-Resistance

DRVSET = INTVCC

TGxx or BGxx Transition Time4

Rise Time

Fall Time

TGxx Off to BGxx On Delay4

Synchronous Switch On Delay Time

DTCA = 0 V

BGxx Off to TGxx On Delay4

Top Switch On Delay Time

DTCB = 0 V

BGxx Falling to SW Rising Delay5

DTCA = INTVCC, DTCB = INTVCC or resistor

DTCA = 50 kΩ, DTCB = INTVCC or resistor

DTCA = 100 kΩ, DTCB = INTVCC or resistor

SW Falling to BGxx Rising Delay5

DTCB = INTVCC, DTCA = INTVCC or resistor

0.5

DTCB = 50 kΩ, DTCA = INTVCC or resistor

DTCB = 100 kΩ, DTCA = INTVCC or resistor

TGxx Minimum On-Time6

tON(MIN)

Maximum Duty Cycle

Output in dropout, FREQ = 0 V

INTVCC LOW DROPOUT (LDO)

LINEAR REGULATORS

INTVCC Voltage for VIN and EXTVCC LDOs

EXTVCC = 0 V for VIN LDO, 12 V for EXTVCC LDO

DRVSET = INTVCC

5.2

5.5

5.7

DRVSET = 0 V

4.8

5.0

5.2

DRVSET= 64.9 kΩ

4.5

4.75

5.0

DRVCC Load Regulation

DRVCC load current (ICC) = 0 mA to 100 mA, TA =

25°C

Undervoltage Lockout

UVLO

DRVCC Rising

DRVUV = INTVCC

4.8

5.0

5.2

DRVUV = 0 V

3.6

3.8

4.0

DRVUV = floating

4.2

4.4

4.6

DRVCC Falling

DRVUV = INTVCC

4.55

4.75

4.95

DRVUV = 0 V

3.4

3.6

3.8

DRVUV = floating

4.0

4.18

4.4

EXTVCC LDO Switchover Voltage

EXTVCC Rising

DRVUV = INTVCC or floating, TA = 25°C

5.75

5.95

6.15

DRVUV = 0 V, TA = 25°C

4.6

4.76

4.9

EXTVCC Switchover Hysteresis

EXTVCC Falling

DRVUV = INTVCC or floating

390

DRVUV = 0 V

220

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