LTC3371 datasheet(5/26 Pages) LINER

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LTC3371

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ELECTRICAL CHARACTERISTICS The

denotes the specifications which apply over the specified operating

junction temperature range, otherwise specifications are at TA = 25°C. (Note 2) VCC = VINA-H = 3.3V, unless otherwise specified.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Buck Regulators Combined

IFWD2

PMOS Current Limit

2 Buck Power Stages Combined (Note 5)

4.6

IFWD3

PMOS Current Limit

3 Buck Power Stages Combined (Note 5)

6.9

IFWD4

PMOS Current Limit

4 Buck Power Stages Combined (Note 5)

9.2

Interface Logic Pins (RST1-4, WDO, WDI, PLL/MODE, C1, C2, C3)

IOH

Output High Leakage Current

RST1-4, WDO 5.5V at Pin

µA

VOL

Output Low Voltage

RST1-4, WDO 3mA into Pin

0.1

0.4

VIH

WDI Input High Threshold

1.2

VIL

WDI, C1, C2, C3 Input Low Threshold

0.4

tWDI(WIDTH)

WDI Pulse Width

VIH

PLL/MODE, C1, C2, C3 Input High Threshold

VCC – 0.4

VIL

PLL/MODE Input Low Threshold

VCC – 1.2

Interface Logic Pins (EN1, EN2, EN3, EN4)

VHI(ALLOFF)

Enable Rising Threshold

All Regulators Disabled

730

1200

VHI

Enable Rising Threshold

At Least One Regulator Enabled

400

420

VLO

Enable Falling Threshold

340

390

IEN

Enable Pin Leakage Current

EN = 3.3V

µA

CT Timing Parameters; CT = 10nF

tWDI0

Time from WDO Low Until Next WDO Low

CT = 10nF

10.3

6.2

12.9

15.5

Sec

tWDI

Time from Last WDI Until Next WDO Low

CT = 10nF

1.30

0.77

1.62

1.95

Sec

tWDL

Watchdog Lower Boundary

CT = 10nF

50.6

tWDO

WDO Low Time Absent a Transition at WDI

CT = 10nF

160

202

280

tRST

RST Assertion Delay

CT = 10nF

160

202

240

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 LTC3371 is tested under pulsed load conditions such that

TJ ≈ TA. The LTC3371E is guaranteed to meet specifications from

0°C to 85°C junction temperature. Specifications over the –40°C to

125°C operating junction temperature range are assured by design,

characterization and correlation with statistical process controls. The

LTC3371I is guaranteed over the –40°C to 125°C operating junction

temperature range. The LTC3371H is guaranteed over the –40°C to 150°C

operating junction temperature range. High junction temperatures degrade

operating lifetimes; operating lifetime is derated for junction temperatures

greater than 125°C. Note that the maximum ambient temperature

consistent with these specifications is determined by specific operating

conditions in conjunction with board layout, the rated package thermal

impedance and other environmental factors. The junction temperature

(TJ in °C) is calculated from the ambient temperature (TA in °C) and power

dissipation (PD in Watts) according to the formula:

TJ = TA + (PD • θJA)

where θJA (in °C/W) is the package thermal impedance.

Note 3: The LTC3371 includes overtemperature protection which protects

the device during momentary overload conditions. Junction temperatures

will exceed 150°C when overtemperature protection is active. Continuous

operation above the specified maximum operating junction temperature

may impair device reliability.

Note 4: Static current, switches not switching. Actual current may be

higher due to gate charge losses at the switching frequency.

Note 5: The current limit features of this part are intended to protect the

IC from short term or intermittent fault conditions. Continuous operation

above the maximum specified pin current rating may result in device

degradation over time.

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