LTC1698IGN datasheet(3/24 Pages) LINER

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LTC1698

1698f

The q indicates specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. VDD = 8V, unless otherwise noted. (Note 4)

ELECTRICAL CHARACTERISTICS

Note 1: Absolute Maximum Ratings are those values beyond which the life

of a device may be impaired. All voltages refer to GND.

Note 2: The LTC1698 incorporates a 5V linear regulator to power internal

circuitry. Driving these pins above 5.3V may cause excessive current flow.

Guaranteed by design and not subject to test.

Note 3: The LTC1698E is guaranteed to meet performance specifications

from 0

°C to 70°C. Specifications over the –40°C to 85°C operating

temperature range are assured by design, characterization and correlation

with statistical process controls. For guaranteed performance to

specifications over the –40

°C to 85°C range, the LTC1698I is available.

Note 4: All currents into device pins are positive; all currents out of the

device pins are negative. All voltages are referenced to ground unless

otherwise specified. For applications with VDD < 7V, refer to the Typical

Performance Characteristics.

Note 5: Supply current in active operation is dominated by the current

needed to charge and discharge the external FET gates. This will vary with

the LTC1698 operating frequency, supply voltage and the external FETs

used.

Note 6: This parameter is guaranteed by correlation and is not tested.

Note 7: VFB is tested in an op amp feedback loop which servos VFB to the

internal bandgap voltage.

Note 8: The current comparator output current varies linearly with

temperature.

Note 9: The PWRGD and OVP comparators incorporate 10mV of

hysteresis.

Note 10: The driver disable time-out is proportional to the SYNC period

within the frequency synchronization range.

SYMBOL PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VAUX

Auxiliary Supply Voltage

CVAUX = 0.1µF, ILOAD = 0mA to 10mA, VDD = 7V to 12.6V

3.135

3.320

3.465

Current Limit Amplifier

IISNSGND ISNSGND Input Current

VISNSGND = 0V

0.05

µA

IISNS

ISNS Input Current

VISNS = 0V

0.05

µA

VILIMTH

Current Limit Threshold

VICOMP = 2.5V, VISNSGND = 0V

– 27.0

– 25

– 23.0

(VISNS – VISNSGND)

– 27.5

– 25

– 22.5

IICOMP

ICOMP Source Current

VISNSGND = 0V, VISNS = – 0.3V, VICOMP = 2.5V (Note 8)

– 280

– 200

– 120

µA

– 370

– 200

– 80

µA

ICOMP Sink Current

VISNSGND = 0V, VISNS = 0.3V, VICOMP = 2.5V (Note 8)

120

200

280

µA

200

370

µA

gmILIM

Current Limit Amplifier

VISNSGND = 0V, VICOMP = 2.5V, IICOMP = ±10µA

2.2

3.5

millimho

Transconductance

GICOMP

Current Limit Amplifier

VICOMP = 2.5V, No Load

Open-Loop DC Gain

PWRGD and OVP Comparators

VPWRGD Percent Below VFB

VFB ↓, MARGIN = Open (Note 9)

–9

–6

–3

IPWRGD

Power Good Sink Current

VFB = 2V

µA

VFB = 0V

VOL

Power Good Output Low Voltage

IPWRGD = 3mA, VFB = 0V

0.4

VOVPREF OVPIN Threshold

VFB = VISNS = VISNSGND = 0V, OVPIN ↑ (Note 9)

1.18

1.233

1.28

IOVPIN

OVPIN Input Bias Current

VOVPIN = 1.233V

0.1

µA

tPWRGD

Power Good Response Time

VFB ↑

125

Power Bad Response Time

VFB ↓

0.5

2.5

tOVP

Overvoltage Response Time

VOVPIN ↑, COPTODRV = 0.1µF

520

µs

SYNC and Drivers

VPT

SYNC Input Positive Threshold

1.6

2.2

VNT

SYNC Input Negative Threshold

– 2.2

–1.6

–1

ISYNC

SYNC Input Current

VSYNC = ±10V

150

µA

fSYNC

SYNC Frequency Range

CFG = CCG = 1000pF, VSYNC = ±5V

400

kHz

SYNC Input to Driver Output Delay

CFG = CCG = 1000pF, fSYNC = 100kHz, VSYNC = ±5V

tSYNC

Minimum SYNC Pulse Width

fSYNC = 100kHz, VSYNC = ±10V (Note 6)

tr, tf

Driver Rise and Fall Time

CFG = CCG = 1000pF, fSYNC = 100kHz, VSYNC = ±5V,

10% to 90%

tDDIS

Driver Disable Time-Out

CFG = CCG = 1000pF, fSYNC = 100kHz, VSYNC = ±5V

Measured from CG

↑ (Note 10)

µs

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