LTC1772CS6 datasheet(3/16 Pages) LINER

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LTC1772

TYPICAL PERFORMANCE CHARACTERISTICS

Reference Voltage

vs Temperature

Undervoltage Lockout Trip

Voltage vs Temperature

Shutdown Threshold

vs Temperature

Maximum (VIN – SENSE–) Voltage

vs Duty Cycle

Normalized Oscillator Frequency

vs Temperature

PIN FUNCTIONS

ITH/RUN (Pin 1): This pin performs two functions. It

serves as the error amplifier compensation point as well as

the run control input. The current comparator threshold

increases with this control voltage. Nominal voltage range

for this pin is 0.7V to 1.9V. Forcing this pin below 0.35V

causes the device to be shut down. In shutdown all

functions are disabled and the PGATE pin is held high.

GND (Pin 2): Ground Pin.

VFB (Pin 3): Receives the feedback voltage from an exter-

nal resistive divider across the output.

SENSE– (Pin 4): The Negative Input to the Current Com-

parator.

VIN (Pin 5): Supply Pin. Must be closely decoupled to GND

Pin 2.

PGATE (Pin 6): Gate Drive for the External P-Channel

MOSFET. This pin swings from 0V to VIN.

TEMPERATURE (

°C)

–55

775

780

790

795

800

825

810

–15

125

1772 G01

785

815

820

805

–35

85 105

VIN = 4.2V

TEMPERATURE (

°C)

–55

–10

–8

–4

–2

–15

125

1772 G02

–6

–35

85 105

VIN = 4.2V

TEMPERATURE (

°C)

–55

1.84

1.88

1.96

2.00

2.04

2.24

2.12

–15

125

1772 G03

1.92

2.16

2.20

2.08

–35

85 105

VIN = 4.2V

VIN FALLING

DUTY CYCLE (%)

100

1772 G04

130

120

110

100

VIN = 4.2V

TA = 25°C

TEMPERATURE (

°C)

–55

200

240

320

360

400

600

480

–15

125

1772 G05

280

520

560

440

–35

85 105

VIN = 4.2V

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