LTM4608A datasheet(4/36 Pages) LINER

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LTM4644/LTM4644-1

4644fe

For more information www.linear.com/LTM4644

1.0V Output Transient Response

1.5V Output Transient Response

2.5V 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 LTM4644E/LTM4644E-1 is tested under pulsed load

conditions such that TJ ≈ TA. The LTM4644E/LTM4644-1 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 LTM4644I/LTM4644I-1

is guaranteed to meet specifications over the full –40°C to 125°C internal

operating temperature range. The LTM4644MP/LTM4644MP-1 is tested

and guaranteed over 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

LOAD CURRENT (A)

100

4644 G01

3.3VOUT

2.5VOUT

1.8VOUT

1.5VOUT

1.2VOUT

LOAD CURRENT (A)

4644 G02

5VOUT

3.3VOUT

2.5VOUT

1.8VOUT

1.5VOUT

1.2VOUT

LOAD CURRENT (A)

0.001

100

0.01

4644 G03

0.1

5VIN

12VIN

20µs/DIV

LOAD STEP

1A/DIV

4644 G04

VOUT

50mV/DIV

AC-COUPLED

VIN = 12V, VOUT = 1V, IOUT = 3A TO 4A, 1A/µs

CFF = 10pF

OUTPUT CAPACITOR = 1 • 47µF CERAMIC

(Per Channel)

20µs/DIV

LOAD STEP

1A/DIV

4644 G05

VOUT

50mV/DIV

AC-COUPLED

VIN = 12V, VOUT = 1.5V, IOUT = 3A TO 4A, 1A/µs

CFF = 10pF

OUTPUT CAPACITOR = 1 • 47µF CERAMIC

20µs/DIV

LOAD STEP

1A/DIV

4644 G06

VOUT

50mV/DIV

AC-COUPLED

VIN = 12V, VOUT = 2.5V, IOUT = 3A TO 4A, 1A/µs

CFF = 10pF

OUTPUT CAPACITOR = 1 • 47µF CERAMIC

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