LTC3441 datasheet(3/20 Pages) AD

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LTC3246

3246fa

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ELECTRICAL CHARACTERISTICS

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

IADJ

VOUTS/ADJ Input Current

SEL1 = SEL2 = VIN

–50

+50

IOUT_SCKT

IVOUT Short Circuit Foldback Current VOUT = 0V

250

ROUT

Charge Pump Output Impedance

2:1 Step-Down Mode

1:1 Step-Down Mode, VIN = 5.5V

1:2 Step-Up Mode, VIN = 3V, VOUT ≥ 3.3V (Note 6) l

1.2

VOUT_OV_RST

VOUT Overvoltage Reset

% of Final Regulation Voltage at Which

VOUT Rising Makes RST Go Low

VOUT Falling Makes RST Go Hi-Z

106

109

108.5

111.5

VOUT_UV_RST

VOUT Undervoltage Reset

% of Final Regulation Voltage at Which

VOUT Rising Makes RST Go Hi-Z

VOUT Falling Makes RST Go Low

97.5

VOUT_PD

VOUT Pull-Down in Shut Down

SEL1 = SEL2 = 0V

100

VOUT_RIPPLE

VOUT Ripple Voltage

COUT = 10µF

COUT = 22µF

Reset Timer Control Pin (RT)

IRT(UP)

RT Pull-Up Current

VRT = 0.3V

–2

–3.1

–4.2

µA

IRT(DOWN)

RT Pull-Down Current

VRT = 1.3V

3.1

4.2

µA

IRT(INT)

Internal RT Detect Current

VRT = VBIAS

0.4

µA

VRT(INT)

RT Internal Timer Threshold

VRT Rising

2.0

2.4

2.65

Reset Timer Input (RSTI)

VRSTI_H

RSTI Input High Voltage

1.22

1.27

VRSTI_L

RSTI Input Low Voltage

1.04

1.2

IRSTI_H

RSTI Input High Current

RSTI = 5V

–1

µA

IRSTI_L

RSTI Input Low Current

RSTI = 0V

–1

µA

Reset Timing

tRST(INT)

Internal Reset Timeout Period

VRT = VBIAS

150

200

270

tRST(EXT)

Adjustable Reset Timeout Period

CRT = 2.2nF

tRSTIL

RSTI Low to RST Asserted

µs

Reset Output (RST)

VOL(RST)

Output Voltage Low RST

IRST = 2mA

0.1

0.4

IOH(RST)

RST Output Voltage High Leakage

VRST = 5V

–1

µA

Watchdog Timing

tWDU(INT)

Internal Watchdog Upper Boundary

VWT = VBIAS

1.2

1.6

2.2

tWDL(INT)

Internal Watchdog Lower Boundary

VWT = VBIAS

37.5

tWDR(EXT)

External Watchdog Timeout Period

CWT = 2.2nF

100

160

220

tWDU(EXT)

External Watchdog Upper Boundary

tWDR(EXT) • (128/129)

tWDL(EXT)

External Watchdog Lower Boundary

tWDR(EXT) • (5/129)

Watchdog Timer Input (WDI)

VIH

WDI Input High Voltage

1.1

1.6

VOL

WDI Input Low Voltage

0.4

0.8

IIH

WDI Input High Current

VWDI = 38V

–1

µA

IIL

WDI Input Low Current

VWDI = 0V

–1

µA

tPW(WDI)

Input Pulsewidth

400

The l denotes the specifications which apply over the specified operating

junction temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, CFLY = 2.2µF, COUT = 10µF, unless otherwise noted.

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