LT8471 View Datasheet(PDF) - Linear Technology

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Description

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LT8471

Dual Multitopology DC/DC Converters with 2A Switches and Synchronization

Linear Technology 

LT8471

Electrical Characteristics The l denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. VIN1 = VIN2 = 5V, unless otherwise noted (Note 2).

PARAMETER

CONDITIONS

MIN TYP MAX UNITS

Schottky Forward Voltage

Start-Up Characteristics

IDIODE = 100mA

650

mV

Soft-Start Charge Current

VSS1, VSS2 = 50mV, Current Flows Out of

SS1, SS2 Pins

l 5.5

8.5

11.5

µA

OV/UV Current for OVLO

Current into OV/UV Pin. VOV/UV Internally Clamped l 76

80

84

µA

to 1.37V, Current Rising

OV/UV Pin Bias Current

OV/UV Minimum Input Voltage High

VOV/UV =1V

Active Mode, OV/UV Rising

Active Mode, OV/UV Falling

0.01

0.5

µA

l 1.165 1.215 1.265

V

l 1.13 1.18 1.22

V

OV/UV Input Voltage Low

Shutdown Mode

l

0.3

V

FB Pin Threshold for Power Good

(Positive Output Voltage)

FB Rising

FB Falling

l 715

740

765

mV

l 708

730

752

mV

FB Pin Threshold for Power Good

(Negative Output Voltage)

FB Falling

FB Rising

l –766 –736 –706

mV

l –755 –727 –699

mV

PG1, PG2 Voltage Output Low

PG1, PG2 Leakage

VFB = 0.6V, IPG = 250μA

VPG1, VPG2 = 12V, PG Driver Off

0.32

0.6

V

0.01

1

µA

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 LT8471E is guaranteed to meet performance specifications from

0°C to 125°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 LT8471I is guaranteed

over the full –40°C to 125°C. The LT8471H is guaranteed over the full –40°C

to 150°C operating junction temperature range. Operating lifetime is derated

at junction temperatures greater than 125°C.

Note 3: Current limit guaranteed by design and/or correlation to static test.

Note 4: Current Limit measured at equivalent switching frequency of 1MHz.

Note 5: This IC includes overtemperature protection that is intended

to protect the device during momentary overload conditions. Junction

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

Continuous operation above the specified maximum operating junction

temperature may impair device reliability.

Note 6: Low side and high side configurations are discussed in the Switch

Configurations and the Skyhook Regulator section.

Note 7: Minimum switch on-time, off-time is guaranteed by design.

8471fc

4

For more information www.linear.com/8471

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