LTM4676A datasheet(4/22 Pages) LINER

4 / 22 page

LTC3874-1

38741f

For more information www.linear.com/LTC3874-1

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 LTC3874-1 is tested under pulsed load conditions such

that TJ ≈ TA. The LTC3874E-1 is guaranteed to meet specifications

from 0°C to 85°C junction temperature. Specifications over the –40°Ç

to 125°C operating junction temperature range are assured by design,

characterization and correlation with statistical process controls. The

LTC3874I-1 is guaranteed over the –40°C to 125°C operating junction

temperature range. Note that the maximum ambient temperature

consistent with these specifications is determined by specific operating

conditions in conjunction with board layout, the related package thermal

impedance and other environmental factors. The junction temperature TJ

is calculated from the ambient temperature TA and power dissipation PD

according to the following formula: TJ = TA + (PD • 46.9°C/W)

Note 3: Output voltage is set and controlled by master controller in

multiphase operations.

Note 4: The minimum on-time condition corresponds to an inductor

peak-to-peak ripple current ≥40% of IMAX (see Minimum On-Time

Considerations in the Applications Information section).

Note 5: EXTVCC is enabled only if VIN is higher than 6.5V.

elecTrical characTerisTics

Typical perForMance characTerisTics

Load Step (Discontinuous

Conduction Mode) 4-Phase with

Master Controller LTC3884-1

Efficiency and Power Loss vs

Output Current (4-Phase with

Master Controller LTC3884-1)

Load Step (Forced Continuous

Mode) 4-Phase with Master

Controller LTC3884-1

Efficiency vs Output Current

and Mode (4-Phase with Master

Controller LTC3884-1)

Efficiency vs Output Current

and Mode (4-Phase with Master

Controller LTC3884-1)

(TA = 25°C unless otherwise specified)

VIN = 12V

VOUT = 1.8V

fSW = 425kHz

CCM

DCM

LOAD CURRENT (A)

0 10 20 30 40 50 60 70 80 90 100 110 120

100

38741 G1

VIN = 12V

VOUT = 1.2V

fSW = 425kHz

CCM

DCM

LOAD CURRENT (A)

0 10 20 30 40 50 60 70 80 90 100 110 120

100

38741 G2

VIN = 12V

VOUT = 1.8V

fSW = 425kHz

CCM

EFFICIENCY

POWER LOSS

0.29mΩ

1.5mΩ

0.29mΩ

1.5mΩ

LOAD CURRENT (A)

0 10 20 30 40 50 60 70 80 90 100 110 120

100

38741 G3

VIN = 12V

VOUT = 1.2V

ILOAD 0A TO 20A

50µs/DIV

ILOAD

50A/DIV

VOUT

AC-COUPLED

50mV/DIV

IL(SLAVE0)

10A/DIV

IL(MASTER0)

10A/DIV

38741 G04

VIN = 12V

VOUT = 1.2V

ILOAD 0A TO 20A

50µs/DIV

ILOAD

50A/DIV

VOUT

AC-COUPLED

50mV/DIV

I(SLAVE0)

10A/DIV

I(MASTER0)

10A/DIV

38741 G05

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