LTC1504CS8-3.3 View Datasheet(PDF) - Linear Technology

Part Name

Description

MFG CO.

LTC1504CS8-3.3

500mA Low Voltage Step-Down Synchronous Switching Regulator

Linear Technology 

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

Supply Current vs Supply Voltage

14

TA = 25°C

12 IOUT = 0

10

8

6

VFB = VOUT

4

2

VFB = VCC

0

2.5

5

7.5

10

SUPPLY VOLTAGE (V)

1504 • TPC01

Switch On-Resistance vs

Temperature

3.5

3.0

2.5

VCC = 3.3V

2.0

VCC = 5V

1.5

VCC = 10V

1.0

0.5

0

–50 –25

0 25 50 75

TEMPERATURE (°C)

100 125

1504 • TPC03

Supply Current vs Temperature

10

VCC = 5V

IOUT = 0

VFB = VOUT

1

VFB = VCC

0.1

–50 –25

0 25 50 75

TEMPERATURE (°C)

100 125

1504 • TPC02

Current Limit Threshold vs RIMAX

700

TA = 25°C

600 VCC = 5V

500

400

300

200

100

0

10k

RIMAX (Ω)

100k

1504 • TPC04

3

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