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DC2171A-A

P1-P3P4-P6
1
dc2171a-af
DEMO MANUAL DC2171A-A
DESCRIPTION
LTM4623
3A Ultrathin Step-Down
µModule Regulator
Demonstration circuit 2171A-A features the LT M
®
4623
µModule
®
regulator, a tiny low profile high performance
step-down regulator. The LTM4623 has an operating input
voltage range of 4V to 20V and is able to provide an output
current of up to 3A. The output voltage is pro-grammable
from 0.6V to 5V. The LTM4623 is a complete DC/DC point
of load regulator in a 6.25mm × 6.25mm × 1.82mm round
pad LGA package requiring only a few input and output
capacitors. Output voltage tracking is available through the
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
PERFORMANCE SUMMARY
TRACK/SS pin for supply rail sequencing. CLKIN, CLKOUT
and PHMODE pins are available for clock synchronization
and interleaving. The LTM4623 data sheet must be read
in conjunction with this demo manual prior to working on
or modifying demo circuit 2171A-A.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2171A-A
PARAMETER CONDITIONS / NOTES VALUE
Input Voltage Range 4V to 20V
Output Voltage V
OUT
Jumper Selectable 1.0VDC, 1.2VDC, 1.5VDC, 1.8VDC, 2.5VDC,
3.3VDC, 5VDC
Maximum Continuous Output Current Derating Is Necessary for Certain Operating
Conditions. See Data Sheet for Details
3ADC
Default Operating Frequency 1MHz
Efficiency V
IN
= 12V, V
OUT
= 1.8V, I
OUT
= 3A 83.2% See Figure 2
Specifications are at 25°C
BOARD PHOTO
2
dc2171a-af
DEMO MANUAL DC2171A-A
QUICK START PROCEDURE
Demonstration circuit 2171A-A is an easy way to evaluate
the performance of the LTM4623. Please refer to Figure 1
for test setup connections and follow the procedure below.
1. With power off, place the jumpers in the following
positions for a typical 1.8V
OUT
application:
JP7 JP6 JP4
RUN MODE VOUT SELECT
ON CCM 1.8V
2. Before connecting input supply, load and meters, pre-
set the input voltage supply to be between 4V to 20V.
Pre-set the load current to 0A.
3. With power off, connect the load, input voltage supply
and meters as shown in Figure 1.
4. Turn on input power supply. The output voltage meter
should display the selected output voltage ±1.5%.
5. Once the proper output voltage is established, adjust
the load current within the 0A-3A range and observe
the load regulation, efficiency, and other parameters.
Output voltage ripple should be measured at J6 with a
BNC cable terminated into 50Ω and an oscilloscope.
6. To observe increased light load efficiency place the
MODE pin jumper (JP6) in the DCM position.
7. For optional load transient testing apply an adjustable
positive pulse signal between IOSTEP CLK and GND
pins. The pulse amplitude sets the load step current
amplitude. The pulse width should be short (<1ms)
and pulse duty cycle should be low (<15%) to limit the
thermal stress on the load transient circuit. The load
step current can be monitored with a BNC connected
to J5 (50mV/A).
+–
A
–
+
V
+
–
LOAD
0A-5A
V
IN
A
–
+
V
+
–
+
–
Figure 1. Test Setup
3
dc2171a-af
DEMO MANUAL DC2171A-A
QUICK START PROCEDURE
LOAD CURRENT (A)
0
EFFICIENCY (%)
85
90
95
80
75
70
1
2
3
5V
OUT
3.3V
OUT
2.5V
OUT
1.8V
OUT
1.5V
OUT
1.2V
OUT
1.0V
OUT
LOAD CURRENT (A)
0
EFFICIENCY (%)
85
90
95
80
75
70
1
2
3
3.3V
OUT
2.5V
OUT
1.8V
OUT
1.5V
OUT
1.2V
OUT
1.0V
OUT
Figure 2. Measured Supply Efficiency at 12V
IN
and 5V
IN
V
IN
(V) V
OUT
(V) C
OUT
12 1.8
1 × 100µF/6.3V +
1 × 22µF/6.3V +
1 × 47µF/6.3V
V
IN
(V) V
OUT
(V) I
OUT
(A) C
OUT
12 1.8 5
1 × 100µF/6.3V +
1 × 22µF/6.3V +
1 × 47µF/6.3V
Figure 3. Measured Load Transient Response
(1.5A-3A Load Step)
Figure 4. Measured V
OUT
Ripple
Figure 5
V
OUT
50mV/DIV
I
OUT_STEP
2A/DIV
1.5A DC
V
OUT
10mV/DIV
V
IN
(V) V
OUT
(V) I
LOAD
(A) f
SW
(MHz) T
AMBIENT
(°C) FORCED AIRFLOW (LFM)
12 1 3 1 25 0
P1-P3P4-P6

DC2171A-A

Mfr. #:
Buy DC2171A-A
Manufacturer:
Analog Devices Inc.
Description:
Power Management IC Development Tools LTM4623 Demo Board - Low Profile 20VIN,
Lifecycle:
New from this manufacturer.
Delivery:
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