LTC3832 datasheet(3/24 Pages) LINER

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LTC3832/LTC3832-1

sn3832 3832fs

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

IVCC

Supply Current

Figure 2, VSHDN = VCC

0.7

1.6

VSHDN = 0V

110

µA

IPVCC

PVCC Supply Current

Figure 2, VSHDN = VCC (Note 3)

VSHDN = 0V

0.1

µA

fOSC

Internal Oscillator Frequency

FREQSET Floating

230

300

360

kHz

VSAWL

VCOMP at Minimum Duty Cycle

1.2

VSAWH

VCOMP at Maximum Duty Cycle

2.2

VCOMPMAX

Maximum VCOMP

VFB = 0V, PVCC1 = 8V

2.85

∆fOSC/∆IFREQSET Frequency Adjustment

kHz/

µA

Error Amplifier Open-Loop DC Gain

Measured from FB to COMP,

SENSE+ and SENSE– Floating, (Note 4)

Error Amplifier Transconductance

Measured from FB to COMP,

1600

2000

2400

µmho

SENSE+ and SENSE– Floating, (Note 4)

ICOMP

Error Amplifier Output Sink/Source Current

100

µA

IMAX

IMAX Sink Current

VIMAX = VCC

812

µA

(Note 10)

412

µA

IMAX Sink Current Tempco

VIMAX = VCC (Note 6)

3300

ppm/

°C

VIH

SHDN Input High Voltage

2.4

VIL

SHDN Input Low Voltage

0.8

IIN

SHDN Input Current

VSHDN = VCC

0.1

µA

ISS

Soft-Start Source Current

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

–8

–12

–18

µA

ISSIL

Maximum Soft-Start Sink Current

VIMAX = VCC, VIFB = 0V,

1.6

In Current Limit

VSS = VCC (Note 8), PVCC1 = 8V

RSENSE

SENSE Input Resistance

23.7

Ω

RSENSEFB

SENSE to FB Resistance

Ω

tr, tf

Driver Rise/Fall Time

Figure 2, PVCC1 = PVCC2 = 5V (Note 5)

250

tNOV

Driver Nonoverlap Time

Figure 2, PVCC1 = PVCC2 = 5V (Note 5)

120

250

DCMAX

Maximum G1 Duty Cycle

Figure 2, VFB = 0V (Note 5), PVCC1 = 8V

The q denotes specifications that apply over the full operating temperature

range, otherwise specifications are at TA = 25°C. VCC, PVCC1, PVCC2 = 5V, unless otherwise noted. (Note 2)

ELECTRICAL CHARACTERISTICS

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

of a 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: Supply current in normal operation is dominated by the current

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

the LTC3832 operating frequency, operating voltage and the external FETs

used.

Note 4: The open-loop DC gain and transconductance from the SENSE+

and SENSE– pins to COMP pin will be (AV)(0.6/2.5) and (gm)(0.6/2.5)

respectively.

Note 5: Rise and fall times are measured using 10% and 90% levels. Duty

cycle and nonoverlap times are measured using 50% levels.

Note 6: Guaranteed by design, not subject to test.

Note 7: PVCC1 must be higher than VCC by at least 2.5V for G1 to operate

at 95% maximum duty cycle and for the current limit protection circuit to

be active.

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: The LTC3832E/LTC3832-1E are guaranteed to meet performance

specifications from 0

°C to 70°C. Specifications over the –40°C to 85°C

operating temperature range are assured by design, characterization and

correlation with statistical process controls.

Note 10: The minimum and maximum limits for IMAX over temperature

includes the intentional temperature coefficient of 3300ppm/

°C. This

induced temperature coefficient counteracts the typical temperature

coefficient of the external power MOSFET on-resistance. This results in a

relatively flat current limit over temperature for the application.

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