LTC1876 datasheet(4/36 Pages) LINER

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LTC1876

1876fa

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

3.3V Linear Regulator

V3.3OUT

3.3V Regulator Output Voltage

No Load

3.25

3.35

3.45

V3.3IL

3.3V Regulator Load Regulation

I3.3 = 0mA to 10mA

0.5

V3.3VL

3.3V Regulator Line Regulation

6V < VIN < 30V

0.05

0.2

PGOOD Output

VPGL

PGOOD Voltage Low

IPGOOD = 2mA

0.1

0.3

IPGOOD

PGOOD Leakage Current

VPGOOD = 5V

±1

µA

VPG

PGOOD Trip Level, Either Controller

VOSENSE with Respect to Set Output Voltage

VOSENSE Ramping Negative

–6

–7.5

–9.5

VOSENSE Ramping Positive

7.5

9.5

Aux Output

AUXVINMIN

AUX Minimum Operating Voltage

2.4

2.6

AUXVFB

AUX Regulated Feedback Voltage

1.23

1.26

1.28

AUXIFB

AUX Feedback Pin Bias Current

120

360

AUXIQ

AUX Input DC Supply Current

Normal Mode

VAUXSD = 2.4V, Not Switching

Shutdown

VAUXSD = 0V

0.01

µA

AUXVLINEREG

AUX Line Regulation

2.6V

≤ AUXVIN ≤ 16V

0.01

0.05

%/V

AUXfOSC

AUX Oscillator Frequency

0.8

1.2

1.6

MHz

AUXDCMAX

AUX Oscillator Maximum Duty Cycle

AUXILIMIT

AUX Switch Current Limit

(Note 9)

1.4

AUXVCESAT

AUX Switch Saturation Voltage

ISW = 900mA (Note 10)

330

550

AUXILEAKAGE

AUX Switch Leakage Current

VSW = 5V

0.01

µA

AUXVAUXSD

AUX Shutdown Input Voltage

AUX Shutdown Upper Trip Point

2.4

AUX Shutdown Lower Trip Point

0.5

IAUXSD

AUXSD Pin Bias Current

VAUXSD = 3V

µA

VAUXSD = 0V

0.01

0.1

µA

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

of a device may be impaired.

Note 2: The LTC1876E is 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 3: TJ is calculated from the ambient temperature TA and power

dissipation PD according to the following formulas:

LTC1876EG: TJ = TA + (PD • 95°C/W)

Note 4: The LTC1876 is tested in a feedback loop that servos VITH1, 2 to a

specified voltage and measures the resultant VOSENSE1, 2.

Note 5: Dynamic supply current is higher due to the gate charge being

delivered at the switching frequency. See Applications Information.

Note 6: Rise and fall times are measured using 10% and 90% levels.

Delay times are measured using 50% levels.

Note 7: The minimum on-time condition is specified for an inductor peak-

to-peak ripple current

≥40% of IMAX (see Minimum On-Time

Considerations in the Applications Information section).

Note 8: VFREQSET pin internally tied to 1.19V reference through a large

resistance.

Note 9: Current limit guaranteed by design and/or correlation to static test.

Note 10: 100% tested at wafer level.

ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. VIN = 15V, VRUN/SS1, 2 = 5V, AUXVIN = 3V unless otherwise noted.

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