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Description
Demonstration circuit 1738A features the
µModule
step-down converter that integrates both a high
®
efficiency switching regulator and a 5A UltraFast™ linear
regulator, resulting in a low noise solution suitable for high
speed data applications. The demo circuit is designed for
an input voltage of 6V to 36V and an operating frequency
of 250kHz. The output voltage is digitally programmable
from 0.8V to 1.8V in 50mV increments by adjusting the
three tri-state inputs VO0, VO1, and VO2.
The user may adjust the output voltage over a continuous
±10% range by applying a voltage to MARGA. A PGOOD
signal indicates that the output is within 10% of the target
BoarD photo
DEMO MANUAL DC1738A
36V
IN
Noise, 5A µModule Regulator
LTM
8028, a
voltage. The SENSEP pin creates a Kelvin sense connec-
®
tion to account for voltage drops due to PCB resistances
between the regulator and the load.
The LTM8028 data sheet gives a complete description of
the part, operation and application information. The data
sheet must be read in conjunction with this demo manual
prior to working on or modifying DC1738A.
Design files for this circuit board are available at
http://www.linear.com/demo
L, LT, LTC, LTM, Linear Technology, the Linear logo and µModule are registered trademarks
and UltraFast is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
, UltraFast, Low Output
LTM8028
dc1738af
1
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Summary of Contents for Linear Technology DC1738A
- Page 1 The user may adjust the output voltage over a continuous ±10% range by applying a voltage to MARGA. A PGOOD L, LT, LTC, LTM, Linear Technology, the Linear logo and µModule are registered trademarks and UltraFast is a trademark of Linear Technology Corporation. All other trademarks are the signal indicates that the output is within 10% of the target property of their respective owners.
-
Page 2: Performance Summary
1.10V –120 High Float 1.15V –140 High High 1.20V Float 1.25V FREQUENCY (MHz) dc1738a F01 Float Float 1.30V Figure 1. DC1738A Output Noise Spectrum Float High 1.35V Float Float 1.40V Float Float Float 1.45V Float Float High 1.50V Float High 1.55V... -
Page 3: Quick Start Procedure
DEMO MANUAL DC1738A Quick start proceDure Demonstration circuit 1738A is an easy way to evaluate 5. Once the proper output voltage is established, adjust the performance of the LTM8028. Refer to Figure 2 for the load within the operating range and observe the... -
Page 4: Parts List
DEMO MANUAL DC1738A parts List ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components CAP., X7R, 10µF, 50V, 10%, 1210 MURATA, GRM32ER71H106K CAP., X7R, 0.01µF, 16V, 5%, 0603 AVX, 0603YC103JAT2A CAP., X5R, 100µF, 6.3V, 20%, 1210 AVX, 12106D107MAT2A CAP., POSCAP, 470µF, 4V, D3L SANYO, 4TPF470ML CAP., X5R, 10µF, 10V, 20%, 0805... -
Page 5: Schematic Diagram
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 6 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. As such, the DEMO BOARD herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods.
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