LTM8080 datasheet(4/32 Pages) AD

4 / 32 page

LTM4703

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 the device's

reliability and lifetime.

Note 2: The LTM4703 is tested under pulsed load conditions such that TJ

≈ TA. The LTM4703E is guaranteed to meet performance specifications

over the 0°C to 125°C internal operating temperature range. 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 LTM4703I is guaranteed to meet specifications over

the full –40°C to 125°C internal operating temperature range. 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 resistance, and other

environmental factors.

Note 3: Not subject to the production test.

Note 4: VOSNS connects directly to VOUT.

Note 5: The EC table test circuits and the test conditions could be different

than typical applications.

Note 6: Adding a capacitor across the SET pin resistor decreases the

output voltage noise. Adding this capacitor bypasses the SET pin resistor’s

thermal noise and the reference current’s noise. The use of a SET pin

bypass capacitor also increases start-up time.

Note 7: See the output current derating curves for different VIN, VOUT, and

TA values in the Typical Performance Characteristics section.

Note 8: SVIN supplies current to the internal circuitry and regulator. SVIN

should be above 4V to achieve regulation of ±1.5% maximum total DC

output voltage error over line, load, and temperature. Also, to provide

sufficient headroom for the SET pin current reference, SVIN must be 0.4V

higher than the desired VOUT.

Note 9: The start-up time is defined as the time it takes from the RUN pin

rising above the RUN threshold to when the VOUT has reached 90% of

final values.

TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted.

Efficiency vs Load, 12VIN,

fSW = 400kHz

Efficiency vs Load, 12VIN,

fSW = 600kHz

Efficiency vs Load, 12VIN,

fSW = 800kHz

LOAD CURRENT (A)

100

4703 G01

2.75VOUT

1.8VOUT

1.0VOUT

0.75VOUT

0.3VOUT

LOAD CURRENT (A)

100

4703 G02

2.75VOUT

1.8VOUT

1.0VOUT

0.75VOUT

LOAD CURRENT (A)

100

4703 G03

2.75VOUT

1.8VOUT

1.0VOUT

0.75VOUT

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