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Description
Demonstration circuit 2268A-F is a high efficiency, high
density, dual 8A, switch mode step-down power supply
on a compact 1.5' × 1.2' PCB. It features the
μModule
regulator. The input voltage is from 4.5V to
®
15V. The output voltage is programmable from 0.6V to
5.3V. DC2268A-F can deliver up to 18A maximum in each
channel. As explained in the data sheet, output current
derating is necessary for certain V
conditions. The board operates in continuous conduc-
tion mode in heavy load conditions. For high efficiency
at low load currents, the resistor jumper (R1/R2) selects
pulse-skipping mode for noise sensitive applications or
Burst-Mode
in less noise sensitive applications. Two out-
®
puts can be connected in parallel for a single 36A output
solution with optional jumper resistors. The board allows
the user to program how its output ramps up and down
BoarD photo
DEMO MANUAL DC2268A-F
LTM
4630A
®
, V
, and thermal
IN
OUT
Figure 1. LTM4630A/DC2268A-F Demo Board
Dual 18A or Single 36A
μModule Regulator
through the TRACK/SS pin. Remote output voltage sens-
ing is available for improved output voltage regulation
at the load point. An optional input inductor L1 reduces
the EMI noise for noise sensitive applications. DC2268A
can be easily inserted to an edge connector for testing
and debugging. These features and the availability of the
LTM4630A in a compact 16mm × 16mm × 4.41mm LGA
package make it ideal for use in many high-density point-
of-load regulation applications. The LTM4630A data sheet
must be read in conjunction with this demo manual for
working on or modifying the DC2268A-F .
Design files for this circuit board are available at
http://www.linear.com/demo/DC2268A-F
L, LT, LTC, LTM, Linear Technology, the Linear logo, µModule and Burst Mode are registered
trademarks of Analog Devices, Inc. All other trademarks are the property of their respective
owners.
LTM4630A
dc2268aff
1
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Table of Contents
Related Manuals for Analog Devices Linear LTM4630A
Summary of Contents for Analog Devices Linear LTM4630A
- Page 1 L, LT, LTC, LTM, Linear Technology, the Linear logo, µModule and Burst Mode are registered solution with optional jumper resistors. The board allows trademarks of Analog Devices, Inc. All other trademarks are the property of their respective owners. the user to program how its output ramps up and down BoarD photo Figure 1.
-
Page 2: Performance Summary
DEMO MANUAL DC2268A-F performance summary Specifications are at T = 25°C Table 1. PARAMETER CONDITIONS VALUE Input Voltage Range 4.5V ~ 15V Output Voltage V = 4.5~15V, I = 0A ~18A 3.3V ± 1.5% OUT1 OUT1 Output Voltage V = 4.5~15V, I = 0A ~18A 2.5V ±... - Page 3 DEMO MANUAL DC2268A-F Quick start proceDure Table 2. DC2268A Demo Circuit DEMO BOARD NUMBER µModule REGULATOR ON THE BOARD OUTPUT CURRENT DC2268A-A LTM4620 13A,13A DC2268A-B LTM4620A 13A,13A DC2268A-C LTM4628 8A, 8A DC2268A-D LTM4630 18A,18A DC2268A-E LTM4630-1 18A,18A DC2268A-F LTM4630A 18A, 18A DC2268A-G LTM4631 10A, 10A...
- Page 4 DEMO MANUAL DC2268A-F Quick start proceDure = 12V = 12V = 5V = 5V (LOAD CURRENT) (LOAD CURRENT) DC2268AF F03 DC2268AF F04 Figure 3. Measured Efficiency on Channel 1 (V = 3.3V, Figure 4. Measured Efficiency on Channel 2 (V = 2.5V, OUT1 OUT2 = 600kHz, Channel 2 Disabled)
- Page 5 DEMO MANUAL DC2268A-F Quick start proceDure Figure 6. Measured Channel 2 9A to 13.5A Load Transient (V = 12V, V = 2.5V) OUT2 Figure 7. Thermal Performance at V = 12V, V = 3.3V/15A, V = 2.5V/15A, OUT1 OUT2 = 600kHz, T = 23°C, 400LFM Airflow dc2268aff...
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Page 6: Parts List
DEMO MANUAL DC2268A-F parts List ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components CIN1, CIN2, CIN3, CIN4, CIN5, CIN6 CAP , 1210 22µF 10% 25V X5R AVX 12103D226KAT2A CO1, CO5 CAP , 7343 330µF 20% 6.3V POSCAP PANASONIC 6TPF330M9L CO2, CO3, CO4, CO6 CAP , 1210 100µF 10% 6.3V X5R AVX 12106D107KAT2A... -
Page 7: Schematic Diagram
DEMO MANUAL DC2268A-F schematic Diagram dc2268aff Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. - Page 8 DEMO MANUAL DC2268A-F DEMONSTRATION BOARD IMPORTANT NOTICE Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions: This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use.
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