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dc1900af

DEMO MANUAL DC1900A

Description

LTM4644EY

Quad 4A Output Step-Down

µModule Regulator

Demonstration circuit 1900A features the LTM®4644EY

quad output step-down regulator. The LTM4644EY has an

operating input voltage range of 4V to 14V and is able to

provide up to 4A of output current from each of its phases.

Each output’s voltage is programmable from 0.6V to 5.5V.

The LTM4644EY is a DC/DC point of load regulator in a

9mm × 15mm × 5.01mm BGA package requiring only a

L

, LT, LTC, LTM, Linear Technology, the Linear logo and µModule are registered trademarks of

Linear Technology Corporation. All other trademarks are the property of their respective owners.

performance summary

BoarD photo

few input and output capacitors. Output voltage tracking

is available through the TRACK/SS pin for supply rail se-

quencing. External clock synchronization is also available

through the CLKIN pin. The LTM4644 data sheet must be

readinconjunctionwiththisdemomanualpriortoworking

on or modifying demo circuit 1900A.

Design files for this circuit board are available at

http://www.linear.com/demo/DC1900A

PARAMETER

CONDITIONS

VALUE

Input Voltage Range

4V to 14V

Jumper Selectable

Maximum Continuous Load Current per Output

De-rating is necessary for certain operating conditions.

See data sheet for details

4ADC

Default Operating Frequency

1MHz

Efficiency

89% See Figure 2