LTC3129 datasheet(3/24 Pages) LINEAR

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LTC4420

4420f

For more information www.linear.com/LTC4420

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: All currents into pins are positive; all voltages are referenced to

GND unless otherwise noted.

Note 3: These pins can be tied to voltages down to –5V through a resistor

that limits the current to less than –1mA.

Note 4: The LTC4420 includes overtemperature protection that is intended

to protect the device during momentary overload conditions. Junction

temperature will exceed 125°C when overtemperature protection is active.

Continuous operation above the specified maximum operating junction

temperature may impair device reliability.

Note 5: The LTC4420 is tested under pulsed load conditions such that

TJ ≈ TA. 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)

elecTrical characTerisTics The

denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. V1 = 3.6V, V2 = 3.6V unless otherwise noted.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

IV2

V2 Current, V2 Powering OUT

V2 Current, V1 Powering OUT

V2 Current in Freshness Seal Mode

IOUT = 0, V1 = 3.6V, V2 = 8.4V

V1 = 3.6V, V2 = 8.4V

V1 = GND, V2 = 5V

3.3

320

120

650

220

µA

RON

Switch Resistance

V1 = V2 = 5V, IOUT = –100mA

tVALID(V1)

Input Qualification Time

V1 Rising, ADJ Rising

Input Comparators

VTHA

ADJ Threshold

ADJ Falling

1.032

1.047

1.062

VHYSTA

ADJ Comparator Hysteresis

ADJ Rising

VTHC

CMP1, V2UV Threshold

CMP1, V2UV Falling

0.378

0.387

0.396

VHYSTC

CMP1, V2UV Comparator Hysteresis

CMP1, V2UV Rising

7.5

12.5

tPDA

ADJ Comparator Falling Response Time

10% Overdrive

7.3

µs

tPDC

CMP1, V2UV Comparator Response Times

20% Overdrive

µs

Power Path Function

ILIM

Output Current Limit

V1, V2 = 8.4V

0.5

1.1

1.6

VREV

Reverse Comparator Threshold

(V1, V2) – VOUT for Power Path Turn-On

tSWITCH

Break-Before-Make Switchover Time

V1 = V2 = 5V, IOUT < 10mA

2.5

µs

V2 Monitoring

tMONL

Longest Possible V2UV Monitor Duration

V2TEST ≥ VIH

128

168

tMONS

Shortest Possible V2UV Monitor Duration

V2TEST ≥ VIH

tLTEST

Time Between V2UV Monitoring Events

V2TEST ≥ VIH

132

180

tHV2T

Minimum Allowed V2TEST High Time

V2TEST Driven Externally

tLV2T

Minimum Allowed V2TEST Low Time

V2TEST Driven Externally

I/O Specifications

VOL

Output Voltage Low, CMPOUT1, GNDSW and V2OK I = 100µA

I = 1mA

120

250

VOH

V2OK Output High Voltage

I = –1µA, V2 = 5V

1.05

1.65

2.3

IOH

V2OK, GNDSW, CMPOUT1 Output High Leakage

CMPOUT1, GNDSW, V2OK = 18V

±50

±150

VIL

V2DIS, V2TEST Input Low Voltage

V1 = V2 = 5V

0.2

VIH

V2DIS, V2TEST Input High Voltage

V1 = V2 = 5V

0.9

IV2X(IN,Z)

V2DIS, V2TEST Allowable Leakage in Open State

0.5

µA

IPU(V2OK)

V2OK Pull-Up Current

V2 = 5V, ADJ = 0V, V2OK = 0V

–2.7

–5

–8

µA

ILEAK

ADJ, CMP1, V2UV Leakage Current

ADJ, CMP1, V2UV = 0V, 1.5V

±1

±5

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