LTC1504 datasheet(3/12 Pages) LINER

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LTC1504

ELECTRICAL CHARACTERISTICS

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 the device may be impaired.

Note 2: All currents into device pins are positive; all currents out of device

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

specified.

Note 3: This parameter is guaranteed by correlation and is not tested

directly.

Note 4: LTC1504 quiescent current is dominated by the gate drive current

drawn by the onboard power switches. With FB or SENSE pulled to VCC

the output stage will stop switching and the static quiescent current can be

observed. With FB or SENSE hooked up normally, the output stage will be

switching and total dynamic supply current can be measured.

Note 5: Fixed output parts will appear to have gmV and AV values 2.6 times

lower than the specified values, due to the internal divider resistors.

Note 6: The ILIM amplifier can sink but not source current. Under normal

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

Note 7: Contact factory for guaranteed specifications at 2.7V supply.

TYPICAL PERFORMANCE CHARACTERISTICS

TEMPERATURE (

°C)

–50

3.5

3.0

2.5

2.0

1.5

1.0

0.5

1504 • TPC03

–25

100

125

VCC = 10V

VCC = 5V

VCC = 3.3V

Switch On-Resistance vs

Temperature

Supply Current vs Supply Voltage

SUPPLY VOLTAGE (V)

2.5

1504 • TPC01

7.5

VFB = VOUT

VFB = VCC

TA = 25°C

IOUT = 0

Current Limit Threshold vs RIMAX

RIMAX (Ω)

10k

700

600

500

400

300

200

100

100k

1504 • TPC04

TA = 25°C

VCC = 5V

TEMPERATURE (

°C)

–50

–25

100

125

0.1

1504 • TPC02

VFB = VOUT

VFB = VCC

VCC = 5V

IOUT = 0

Supply Current vs Temperature

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