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Fabricante

LTM4642IY

20VIN, Dual 4A or Single 8A DC/DC µModule Regulator

Linear Technology 

LTM4642

20VIN, Dual 4A or Single 8A

DC/DC µModule Regulator

Features

Description

nn Small Form Factor Dual 4A Power Supply

nn Wide Input Voltage Range: 4.5V to 20V

(2.375V Min with CPWR Bias)

nn Dual 180° Out-of-Phase Outputs with 4A DC

nn Dual Outputs with 0.6V to 5.5V Range

nn Output Voltage Tracking

nn ±1.5% Maximum Total DC Output Voltage Error

nn Up to 95% Maximum Efficiency

nn Phase-Lockable Fixed Frequency 600kHz to 1.4MHz

nn Constant On-Time, Valley Current Mode Architecture

nn Selectable Burst Mode® Operation

nn Output Overvoltage and Overcurrent Protection

nn 9mm × 11.25mm × 4.92mm BGA Package

Applications

nn Telecom and Networking Equipment

nn Servers

nn FPGA Power

The LTM®4642 is a complete dual 4A or single 8A step-down

DC/DC μModule® (micromodule) regulator. Included in the

package are the switching controller, power FETs, inductor,

and all support components. Operating over input voltage

ranges of 4.5V to 20V, (2.375V min with external CPWR

bias), the LTM4642 supports two outputs with voltage

ranges of 0.6V to 5.5V, set by a single external resistor.

Its high efficiency design delivers 4A continuous current

(5A peak) for each output.

High switching frequency and a valley current mode

architecture enable a very fast transient response to line

and load changes without sacrificing stability. The two

outputs are interleaved with 180° phase to minimize the

ripple noise and reduce the I/O capacitors.

The power module is offered in a 9mm × 11.25mm ×

4.92mm BGA package. The LTM4642 is RoHS compliant

with Pb-free finish.

L, LT, LTC, LTM, Linear Technology, the Linear logo, Burst Mode, µModule and LTpowerCAD

are registered trademarks of Analog Devices, Inc. All other trademarks are the property of their

respective owners. Protected by U.S. Patents, including 5481178, 5847554, 6580258, 6304066,

6476589, 6774611, 8163643.

Typical Application

Dual 4A 1V and 1.2V DC/DC µModule Regulator

VIN

4.75V TO 20V

2.2Ω INTVCC

22µF 133k

2×

4.7µF

VIN1 VIN2 CPWR

RUN1

RUN2

TRACK/SS1

0.1µF

DRVCC INTVCC

VRNG1

PGOOD1

PGOOD2

10k 10k

TRACK/SS2

0.1µF

LTM4642

FREQ

VOUT1

VOUT2

VOUT1 1V AT 4A LOAD

VOUT2 1.2V AT 4A LOAD

+

47µF

100µF

+

47µF

100µF

INTVCC

61.9k

MODE/PLLIN

VOUTS1

VOUTS–

VFB2

470pF

470pF

SGND GND

VFB1

90.9k

VOUT1

60.4k

VOUT2

Efficiency vs Load Current at 12V input

90

1.2V (650kHz)

85

1V (650kHz)

80

75

70

0 0.5 1 1.5 2 2.7 3 3.5 4

LOAD CURRENT (A)

4642 TA01b

PINS NOT USED: COMP1, COMP2, PHASEMD, CLKOUT, EXTVCC, SW1, SW2

4642 TA01a

For more information www.linear.com/LTM4642

4642fb

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