LTM4643 datasheet(4/32 Pages) LINER

4 / 32 page

LTM4643

4643fb

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1.0V Output Transient Response

1.2V Output Transient Response

1.5V Output Transient Response

Efficiency vs Load Current from

5VIN (One Channel Operating)

Efficiency vs Load Current from

12VIN (One Channel Operating)

DCM Mode Efficiency from

1.5VOUT

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 LTM4643 is tested under pulsed load conditions such that

TJ ≈ TA. The LTM4643E 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 LTM4643I is guaranteed to meet specifications over the full

–40°C to 125°C internal operating temperature range. The LTM4643MP

is guaranteed to meet specifications over the full –55°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: 100% tested at wafer level.

Note 4: See output current derating curves for different VIN, VOUT and TA.

Note 5: This IC 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.

TYPICAL PERFORMANCE CHARACTERISTICS

OUTPUT CURRENT (A)

100

0.5

1.5

4643 G01

2.5

3.3VOUT

2.5VOUT

1.8VOUT

1.5VOUT

1.2VOUT

1.0VOUT

OUTPUT CURRENT (A)

0.5

1.5

4643 G02

2.5

3.3VOUT

2.5VOUT

1.8VOUT

1.5VOUT

1.2VOUT

1.0VOUT

LOAD CURRENT (A)

0.001

100

0.01

4643 G03

0.1

5VIN

12VIN

VOUT

50mV/DIV

AC-COUPLED

LOAD STEP

1A/DIV

VIN = 12V

VOUT = 1.0V

OUTPUT CAPACITOR = 1 × 47µF CERAMIC CAP

LOAD STEP = 2A TO 3A WITH 1A/µS SLEW RATE

FEED FORWARD CAP = 100pF

20µs/DIV

4643 G04

(Per Channel)

VOUT

50mV/DIV

AC-COUPLED

LOAD STEP

1A/DIV

VIN = 12V

VOUT = 1.2V

OUTPUT CAPACITOR = 1 × 47µF CERAMIC CAP

LOAD STEP = 2A TO 3A WITH 1A/µS SLEW RATE

FEED FORWARD CAP = 100pF

20µs/DIV

4643 G05

VOUT

50mV/DIV

AC-COUPLED

LOAD STEP

1A/DIV

VIN = 12V

VOUT = 1.5V

OUTPUT CAPACITOR = 1 × 47µF CERAMIC CAP

LOAD STEP = 2A TO 3A WITH 1A/µS SLEW RATE

FEED FORWARD CAP = 100pF

20µs/DIV

4643 G06

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