1
dc1900af
DEMO MANUAL DC1900A
Description
LTM4644EY
Quad 4A Output Step-Down
µModule Regulator
Demonstration circuit 1900A features the
LTM
®
4644EY
µModule
®
regulator, a high-performance high-efficiency
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
read in conjunction with this demo manual prior to working
on or modifying demo circuit 1900A.
Design files for this circuit board are available at
http://www.linear.com/demo/DC1900A
Specifications are at T
A
= 25°C
PARAMETER
CONDITIONS
VALUE
Input Voltage Range
4V to 14V
Output Voltage V
OUT
Jumper Selectable
V
OUT1
= 3.3VDC, V
OUT2
= 2.5VDC,
V
OUT3
= 1.5VDC, V
OUT4
= 1.2VDC
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
V
IN
= 12V, V
OUT1
= 3.3V, I
OUT
= 4A
89% See Figure 2
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