LTC1553_15 datasheet(3/24 Pages) LINER

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LTC1553

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

IIMAX

IMAX Sink Current

VIMAX = VCC

150

180

220

µA

ISS

Soft Start Source Current

VSS = 0V, VIMAX = 0V, VIFB = VCC

–13

– 10

–7

µA

ISSIL

Maximum Soft Start Sink Current

VSENSE = VOUT, VIMAX = VCC, VIFB = 0V

150

µA

Under Current Limit

(Notes 8, 9), VSS = VCC

ISSHIL

Soft Start Sink Current Under Hard

VSENSE = 0V, VIMAX = VCC, VIFB = 0V

Current Limit

tSSHIL

Hard Current Limit Hold Time

VSENSE = 0V, VIMAX = 4V, VIFB↓ from 5V (Note 4)

500

µs

tPWRGD

Power Good Response Time

↑

VSENSE↑ from 0V to Rated VOUT

0.5

tPWRBAD

Power Good Response Time

↓

VSENSE↓ from Rated VOUT to 0V

200

500

1000

µs

tFAULT

FAULT Response Time

VSENSE↑ from Rated VOUT to VCC

200

500

1000

µs

tOT

OT Response Time

OUTEN

↓, VID0 to VID4 = 0 (Note 10) (Figure 3)

µs

VOT

Over-Temperature Trip Point

OUTEN

↓, VID0 to VID4 = 0 (Note 10) (Figure 3)

1.9

2.12

VOTDD

Over-Temperature Driver Disable

OUTEN

↓, VID0 to VID4 = 0 (Note 10) (Figure 3)

1.6

1.7

1.8

VSHDN

Shutdown

OUTEN

↓, VID0 to VID4 = 0 (Note 10) (Figure 3)

0.8

tr, tf

Driver Rise and Fall Time

(Figure 4)

150

tNOL

Driver Nonoverlap Time

(Figure 4)

100

DCMAX

Maximum G1 Duty Cycle

(Figure 4)

VIH

VID0 to VID4 Input High Voltage

VIL

VID0 to VID4 Input Low Voltage

0.8

RIN

VID0 to VID4 Internal Pull-Up

Ω

Resistance

ISINK

Digital Output Sink Current

ELECTRICAL CHARACTERISTICS V

CC = 5V, PVCC = 12V, TA = 25°C, unless otherwise noted. (Note 3)

The q denotes specifications which apply over the full operating

temperature range.

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

of a device may be impaired.

Note 2: When IFB is taken below GND, it will be clamped by an internal

diode. This pin can handle input currents greater than 100mA below GND

without latchup. In the positive direction, it is not clamped to VCC or PVCC.

Note 3: 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.

Note 4: This parameter is guaranteed by correlation and is not tested

directly.

Note 5: The LTC1553 goes into the shutdown mode if VID0 to VID4 are

floating. Due to the internal pull-up resistors, there will be an additional

0.25mA/pin if any of the VID0 to VID4 pins are pulled low.

Note 6: Supply current in normal operation is dominated by the current

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

the LTC1553 operating frequency, supply voltage and the external FETs

used.

Note 7: The open-loop DC gain and transconductance from the SENSE pin to

COMP pin will be (GERR)(1.265/3.3) and (gmERR)(1.265/3.3) respectively.

Note 8: The current limiting amplifier can sink but cannot source current.

Under normal (not current limited) operation, the output current will be zero.

Note 9: Under typical soft current limit, the net soft start discharge current

will be 60

µA (ISSIL) + [–10µA(ISS)] = 50µA. The soft start sink-to-source

current ratio is designed to be 6:1.

Note 10: When VID0 to VID4 are all HIGH, the LTC1553 will be forced to

shut down internally. The OUTEN trip voltages are guaranteed by design for

all other input codes.

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