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Linear Technology DC2172A Demo Manual
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Linear Technology DC2172A Demo Manual

High efficiency, high vin, step-down regulator
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Description
Demonstration circuit 2172A is a high input voltage, 400mA
step-down regulator featuring the LTC7138. The output of
the regulator can be programmed for either 5V, 3.3V or
1.8V with on-board jumpers or is adjustable from 800mV
to V
using an optional feedback divider. The input voltage
IN
range is from 4V to 140V. The LTC7138's Burst Mode
operation, low quiescent current and internal top FET
switch provide high efficiency over a wide range of loads.
Other features include:
• Optional components to adjust the current limit, make it
proportional to V
or improve the efficiency and reduce
IN
the output voltage ripple.
performance summary
PARAMETER
Input Voltage Range
5.0V Output Voltage
3.3V Output Voltage
1.8V Output Voltage
Maximum Output Current, I
OUT
Typical Efficiency
Typical Output Ripple
DEMO MANUAL DC2172A
High Efficiency, High V
Step-Down Regulator
• FBO turret to tie two or more LTC7138 regulators to-
gether if the application requires more load current.
• Optional UVLO and OVLO divider.
• External/internal soft-start.
®
For more details, refer to the LTC7138 data sheet. The
LTC7138 data sheet gives a complete description of the
IC operation and application information. The data sheet
must be read in conjunction with this quick start guide.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2172A
L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners.
Specifications are at T
= 25°C
A
CONDITIONS
V
= 12V, I
= 0mA to 400mA
IN
OUT
V
= 12V, I
= 0mA to 400mA
IN
OUT
V
= 12V, I
= 0mA to 400mA
IN
OUT
V
= 4V to 140V, V
= 5.0, 3.3V, 1.8V or ADJ (V
IN
OUT
V
= 12V, V
= 5V, I
= 400mA
IN
OUT
OUT
V
= 12V, V
= 5V, I
= 400mA
IN
OUT
OUT
LTC7138
VALUE
4V to 140V
5.0V ±2%
3.3V ±2%
1.8V ±2%
≤ V
)
400mA
OUT
IN
82.3%
87mV
P-P
,
IN
dc2172af
1

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Summary of Contents for Linear Technology DC2172A

  • Page 1 V or improve the efficiency and reduce the output voltage ripple. L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.

  • Page 2: Quick Start Procedure

    Note 1. CAUTION: The maximum input voltage of the the performance of the LTC7138. Please refer to Figure 1 DC2172A is 140V. Voltages of 140V or lower are high for proper measurement equipment setup and follow the enough to cause electric shock. Use great care when procedure below.
  • Page 3 DEMO MANUAL DC2172A Quick start proceDure LOAD SUPPLY – – Figure 1. Proper Measurement Equipment Setup – Figure 2. Measuring Output Voltage Ripple dc2172af...
  • Page 4 DEMO MANUAL DC2172A Quick start proceDure L = Sumida CDRH105RNP-151NC (150µH, DCR = 285m typ) = 5V 100V 140V 0.01 0.10 1,000 Load Current (mA) dc2172a F03 Figure 3. Efficiency at 5V L = Sumida CDRH105RNP-151NC (150µH, DCR = 285m typ) = 3.3V...
  • Page 5 DEMO MANUAL DC2172A Quick start proceDure L = Sumida CDRH105RNP-151NC (150µH, DCR = 285m typ) = 1.8V 100V 140V 0.01 0.10 1,000 Load Current (mA) dc2172a F05 Figure 5. Efficiency at 1.8V dc2172af...

  • Page 6: Parts List

    DEMO MANUAL DC2172A parts List ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components CAP 22µF, 200V, ELEC NIPPON CHEMI-CON, EMVE201ARA220MKG5S CAP 1µF, 2220, 10%, 200V, X7R KEMET C2220X105K2RACTU CAP 47nF, 0603, 10%, 25V, X7R AVX 06033C473KAT2A C6, C7 CAP 100µF, 1210, 20%, 10V, X7R TAIYO YUDEN LMK325ABJ107MMH-T CAP 0.1µF, 0603, 10%, 25V, X7R...

  • Page 7: 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 8 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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