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LTC3822

3822f

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

The

● indicates specifications that apply over the full operating temperature

range; otherwise, specifications are at TA = 25°C. VIN = 3.3V unless otherwise noted.

ELECTRICAL CHARACTERISTICS

Note 1: Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

Note 2: The LTC3822E is guaranteed to meet specified performance from

°C to 85°C. Specifications over the –40°C to 85°C operating range are

assured by design characterization, and correlation with statistical process

controls.

Note 3: TJ is calculated from the ambient temperature TA and power

dissipation PD according to the following formula:

TJ = TA + (PD • θJA)

Note 4: Dynamic supply current is higher due to gate charge being

delivered at the switching frequency.

Note 5: The LTC3822 is tested in a feedback loop that servos ITH to a

specified voltage and measures the resultant VFB voltage.

VFB Input Current

(Note 5)

Overvoltage Protect Threshold

Measured at VFB

0.66

0.68

0.70

Overvoltage Protect Hysteresis

Top Gate (TG) Drive Rise Time

CL = 3000pF

Top Gate (TG) Drive Fall Time

CL = 3000pF

Bottom Gate (BG) Drive Rise Time

CL = 3000pF

Bottom Gate (BG) Drive Fall Time

CL = 3000pF

Maximum Duty Cycle

In Dropout

Maximum Current Sense Voltage (VIN – SW)

IPRG = Floating

●

110

120

140

(

∆VSENSE(MAX))

IPRG = 0V

●

100

IPRG = VIN

●

185

200

220

Soft-Start Time

Time for VFB to Ramp from 0.05V to 0.55V

650

µs

Oscillator

Oscillator Frequency

FREQ = Floating

480

550

600

kHz

FREQ = 0V

240

300

340

kHz

FREQ = VIN

640

750

850

kHz

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