LTM4643 datasheet(3/28 Pages) AD

3 / 28 page

LTM8051

Rev. 0

For more information www.analog.com

ELECTRICAL CHARACTERISTICS

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 LTM8051E is guaranteed to meet performance specifications

from 0°C to 125°C internal. Specifications over the full –40°C to

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

characterization and correlation with statistical process controls.

The l denotes the specifications which apply over the specified operating

internal temperature range, otherwise specifications are at TA = 25°C. VIN1n = 12V, RUNn = 2V unless otherwise noted (Note 2).

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Minimum VIN1 Input Voltage

Minimum VIN23 Input Voltage

Minimum VIN4 Input Voltage

VIN1 = 3V

3.0

2.0

Output DC Voltage

n open

n = 27.4kΩ

0.8

Maximum Output DC Current

(Note 3)

2.5

Quiescent Current into VINn

RUN

n = 0

BIAS

n = 5V, SYNCn = 0V, No load

BIAS

n = 5V, SYNCn = 3.3V, No load

μA

µA

Current into BIASn

RUN

n = 0, BIASn = 5V

BIAS

n = 5V, SYNCn = 3.3V, No load

μA

Line Regulation

5V < VINn < 40V

0.1

Load Regulation

12VINn, 0.1A < IOUTn <2A

0.2

Output RMS Ripple

3.3VOUTn

n Voltage

792

784

800

808

816

Current out of FB

VOUTn = 1V, FBn = 0V

μA

Minimum BIAS

n for Proper Operation

3.2

Switching Frequency

n = 113KΩ

n = 30.9KΩ

n = 7.15KΩ

300

KHz

MHz

RUN

n Threshold

0.74

RUN

n Input Current

RUN

n = 0V

μA

n Threshold at FBn

n Rising

n Falling

740

860

n Output Sink Current

n = 0.1V

100

μA

CLKOUT

n VOL

CLKOUT

n VOH

3.3

SYNC

n Input High Threshold

1.5

SYNC

n Input Low Threshold

0.8

SYNC

n Threshold to Enable Spread Spectrum

2.8

SYNC

n Current

SYNC

n = 6V

μA

TRSS

n Source Current

TRSS

n = 0V

μA

TRSS

n Pull-Down Resistance

Fault Condition, TRSS

n = 0.1V

230

The LTM8051I is guaranteed to meet specifications over the full –40°C

to 125°C internal operating temperature range. Note that the maximum

internal temperature is determined by specific operating conditions in

conjunction with board layout, the rated package thermal resistance and

other environmental factors.

Note 3: The maximum current out of either channel may be limited by the

internal temperature of the LTM8051. See output current derating curves

for different VIN, VOUT, and TA.

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