LTM4632

1

4632fc

For more information www.linear.com/LTM4632

TYPICAL APPLICATION

FEATURES

DESCRIPTION

Ultrathin, Triple Output,

Step-Down µModule Regulator

for DDR-QDR4 Memory

The LTM®4632 is an ultrathin triple output step-down

power solution for DDR-QDR4 SRAM. Operating from a

3.6V to 15V input voltage, the LTM4632 supports two ±3A

output rails, both sink and source capable, for VDDQ and

VTT, plus a 10mA low noise reference VTTR output. Both

VTT and VTTR track and are equal to VDDQ/2. Housed

in a 6.25mm × 6.25mm × 1.82mm LGA and 6.25mm ×

6.25mm × 2.42mm BGA packages, the LTM4632 includes

the switching controller, power FETs, inductors and sup-

port components. Alternatively, the power module can

also be configured as a two phase single ±6A output

VTT. Only a few ceramic input and output capacitors are

needed to complete the design.

The LTM4632 supports selectable Burst Mode operation

(CH1 only) and output voltage tracking for supply rail

sequencing. Its high switching frequency and current

mode control enable a very fast transient response to

line and load changes without sacrificing stability.

Fault protection features include overvoltage input, over-

current and overtemperature protection.

The LTM4632 is available with SnPb (BGA) or RoHS com-

pliant terminal finish

QDR4 Memory Power µModule Regulator

Output Efficiency vs Load Current

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Complete DDR-QDR4 SRAM Power Solution

Including VDDQ, VTT, VTTR (or VREF)

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Wide Input Voltage Range: 3.6V to 15V

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0.6V to 2.5V Output Voltage Range

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Dual ±3A DC Output Current with Sink and Source

Capability

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±1.5%, ±10mA Buffered VTTR = VDDQ/2 Output

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3A VDDQ + 3A VTT or Dual Phase Single 6A VTT

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±1.5% Maximum Total Output Voltage Regulation

Error Over Load, Line and Temperature

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Current Mode Control, Fast Transient Response

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External Frequency Synchronization

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Multiphase Parallelable with Current Sharing

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Overvoltage Input and Overtemperature Protection

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Power Good Indicator

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Ultrathin 6.25mm × 6.25mm × 1.82mm LGA and

6.25mm × 6.25mm × 2.42mm BGA Packages

L

, LT, LTC, LTM, µModule, Burst Mode, Linear Technology and the Linear logo are registered

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

52.3k

VDDQ

4632 TA01a

10µF

25V

3.6V TO 15V

VDDQ

1.3V, 3A

22µF

4V

22µF

4V

VTT

0.65V, ±3A

VTTR

0.65V, 10mA

COMP1

VTTR

FB1

GND

LTM4632

PGOOD1 PGOOD2

RUN1

RUN2

SYNC/MODE

TRACK/SS1

COMP2

LOAD CURRENT (A)

0

65

90

80

75

70

85

95

2

3

1

4632 TA01b

12V INPUT

5V INPUT

APPLICATIONS

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DDR Memory Power Supply

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General Purpose Point-of-Load Conversion

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Telecom, Networking and Industrial Equipment