LTC3446 datasheet(3/20 Pages) LINER

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LTC3446

3446fd

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

temperature range, otherwise speciﬁcations are at TA = 25°C. VIN = 3.6V unless otherwise speciﬁed. (Note 2)

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VPG(THRESH) PGOOD Threshold (Note 8)

●

810

RPGOOD

PGOOD Output Resistance

PGOOD Low, Sinking 1mA

●

120

IPGOOD

PGOOD Hi-Z Leakage Current

VPGOOD = 6V

●

1μA

Synchronous Buck Converter

IBUCKFB

Feedback Current

(Note 5)

●

±30

VBUCKFB

Regulated Feedback Voltage

(Note 5)

●

0.788

0.800

0.812

ΔVBUCKFB

Feedback Voltage Line Regulation

VIN = 2.7V to 5.5V (Note 5)

●

0.3

0.5

mV/V

IMAXP

Maximum Peak Inductor Current

VBUCKFB = 0V, Duty Cycle < 35%

1.2

1.55

2.0

IMAXN

NMOS Overcurrent Limit

1.8

Feedback Voltage Load Regulation

(with Respect to VITH)

VITH = 0.5V to 1V, VMODESEL = VIN (Note 5)

0.5

mV/V

fOSC

Oscillator Frequency

●

1.8

2.25

2.7

MHz

RPFET

RDS(ON) of P-Channel FET

ISW = 500mA

0.13

RNFET

RDS(ON) of N-Channel FET

ISW = –500mA

0.14

ILSW

SW Leakage

VENBUCK = 0V, VSW = 0V or 5.5V, VIN = 5.5V

±1

μA

VENBUCK

Buck Enable Pin Threshold

●

0.3

0.65

IENBUCK

Buck Enable Pin Leakage Current

VENBUCK = 5.5V, All Other Pins Grounded

●

1μA

VMODESEL

Mode Select Pin Threshold

●

0.3

0.65

IMODESEL

Mode Select Pin Leakage Current

VMODESEL = 5.5V, All Other Pins Grounded

●

1μA

Error Ampliﬁer Transconductance

VITH = 0.6V

450

700

950

μA/V

Each VLDO: VIN = 3.6V, VLVIN = 1.5V, VLVOUT = 1.2V, Unless Otherwise Speciﬁed

VLVIN

LVIN Pin Operating Voltage

(Note 6)

●

0.9

5.5

ILVIN

LVIN Pin Operating Current

IOUT = 10μA

●

320

μA

LVIN Shutdown Current

VENLDO = 0V

1.5

μA

VLVFB

Feedback Pin Regulation Voltage (Note 7)

1mA ≤ IOUT ≤ 300mA, 1.5V ≤ VLVIN ≤ 5.5V

●

0.395

0.392

0.400

0.405

0.408

ILVFB

Feedback Pin Input Current

VLVFB at Regulation

●

±10

ILVOUT(MAX) Continuous Output Current

●

300

Short-Circuit Output Current

760

VENLDOx

LDO Enable Pin Threshold

●

0.3

0.65

IENLDOx

LDO Enable Pin Leakage Current

VENLDOx = 5.5V, All Other Pins Grounded

●

1μA

Output Voltage Load Regulation

(Referred to the LVFB Pin)

ΔIOUT = 1mA to 300mA

– 1

mV/A

LVFB Line Regulation (with Respect to

the LVIN Pin)

VLVIN = 1.5V to 5.5V, VIN = 3.6V, VLVOUT = 1.2V,

IOUT = 1mA

7.5

μV/V

LVFB Line Regulation (with Respect to

the VIN Pin)

VLVIN = 1.5V, VIN = 2.7V to 5.5V, VLVOUT = 1.2V,

IOUT = 1mA

0.44

mV/V

VDO

LVIN – LVOUT Dropout Voltage

VIN = 2.8V, VLVIN = 1.5V, VLVFB = 0.37V,

IOUT = 300mA (Note 9)

175

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