LTM8049 datasheet(4/20 Pages) LINER

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LTM4661

4661f

For more information www.linear.com/LTM4661

TYPICAL PERFORMANCE CHARACTERISTICS

Efficiency vs Output Current,

VIN = 3.3V

Efficiency vs Output Current,

VIN = 5V

Burst vs Continuous Mode

Efficiency, VIN = 3.3V

5V Output Load Transient

Response

12V Output Load Transient

Response

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 LTM4661 is tested under pulsed load conditions such that

TJ ≈ TA. The LTM4661E 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 LTM4661I 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: The minimum on-time condition is specified for a peak-to-peak

inductor ripple current of ~40% of IMAX Load. (See the Applications

Information section)

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

Note 5: Limit current into the RUN pin to less than 2mA.

Note 6: Guaranteed by design.

Note 7: 100% tested at wafer level.

Note 8: The LTM4661 includes overtemperature protection that is intended

to protect the device during momentary overload conditions. Junction

temperature will exceed 170°C when overtemperature shutdown is active.

Continuous operation above the specified maximum operation junction

temperature may result in device degradation or failure.

LOAD CURRENT (A)

1.8

0.6

1.4

4661 G01

0.8

1.6

0.4

1.2

0.2

VOUT = 5V, 2A DC

VOUT = 8V, 1A DC

VOUT = 12V, 0.65A DC

VOUT = 15V, 0.5A DC

LOAD CURRENT (A)

1.8

0.6

1.4

4661 G02

0.8

1.6

0.4

1.2

0.2

VOUT = 8V, 1.7A DC

VOUT = 12V, 1A DC

VOUT = 15V, 0.8A DC

500µs/DIV

VOUT (AC)

200mV/DIV

LOAD STEP

500mA

TO 1A

4661 G04

VIN = 3.3V, VOUT = 5V

fS = 1MHz (DEFAULT)

500mA TO 1A LOAD STEP

COUT = 2×22µF CERAMIC

500µs/DIV

VOUT (AC)

200mV/DIV

LOAD STEP

200mA

TO 400mA

4661 G05

VIN = 3.3V, VOUT = 12V

fS = 1MHz (DEFAULT)

200mA TO 400mA LOAD STEP

COUT = 2×22µF CERAMIC

LOAD CURRENT (A)

100

0.1

4661 G03

CONTINUOUS MODE

BURST MODE OPERATION

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