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Linear Technology LTC3864 Demo Manual

Demonstration circuit 1722a 55v low iq step-down dc/dc converter with 100% duty cycle capability
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DESCRIPTION
Demonstration circuit 1722A is a high voltage, current
mode DC/DC step-down converter featuring the
The board operates from an input range of 3.5V to 55V,
and provides a 5V, 2A output when the input exceeds 5V.
The PMOSFET architecture allows it to operate seamlessly
up to 100% duty cycle, and function as a saturated switch
below the regulation threshold, down to 3.5V
at 350kHz and may be synchronized to an external clock.
A soft-start feature controls output voltage slew rate at
start-up, reducing current surge and voltage overshoot.
Burst Mode
operation that improves efficiency at light
®
loads can be enabled with a jumper. A power good output
signal is provided. The demonstration board has options
PERFORMANCE SUMMARY
SYMBOL
PARAMETER
V
Input Supply Range
IN
V
Output Voltage
OUT
I
Output Current Range, Continuous
OUT
f
Switching (Clock) Frequency
SW
V
Output Ripple
OUT(P-P)
V
Output Regulation
REG
P
/P
Efficiency (See Figure 3)
OUT
IN
Approximate Size
Arrow.com.
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DEMO MANUAL DC1722A
100% Duty Cycle Capability
for larger MOSFET and diode packages on the back of the
LTC
3864.
board for higher output current requirements.
®
This board is suitable for a wide range of automotive,
telecom, industrial, and other applications. The LTC3864
is available in small 12-pin thermally enhanced MSOP and
DFN packages. For other output requirements, see the
. It operates
LTC3864 data sheet or contact the LTC factory.
IN
Design files for this circuit board are available at
http://www.linear.com/demo/DC1722A
L, LT, LTC, LTM, Linear Technology, Burst Mode 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
CONDITIONS
V
= 14V, I
= 2A (20MHz BW)
IN
OUT
Line and Load (5.5V
to 55V
, 0A
IN
IN
V
=14V, I
= 2A
IN
OUT
Component Area x Top Component Height
55V Low I
Q
DC/DC Converter with
= 25°C
A
MIN
TYP
3.5
5.0
0
350
to 2A
)
0.23
OUT
OUT
0.6 × 0.6 × 0.14
LTC3864
Step-Down
MAX
UNITS
55
V
V
2
A
kHz
15
mV
P–P
%
84
%
Inches
dc1722afa
1

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Summary of Contents for Linear Technology LTC3864

  • Page 1 ® L, LT, LTC, LTM, Linear Technology, Burst Mode and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective loads can be enabled with a jumper. A power good output owners.

  • Page 2: Quick Start Procedure

    Demonstration circuit 1722 is easy to set up to evaluate 3. Turn on the power at the input. the performance of the LTC3864. Refer to Figure 1 for NOTE: Make sure that the input voltage never exceeds 55V. proper measurement equipment setup and follow the 4.
  • Page 3 DEMO MANUAL DC1722A QUICK START PROCEDURE DC1722a F01 Figure 1. Proper Measurement Equipment Setup dc1722afa Arrow.com. Arrow.com. Arrow.com. Downloaded from Downloaded from Downloaded from...
  • Page 4 DEMO MANUAL DC1722A QUICK START PROCEDURE = 6V = 14V = 28V = 55V 0.01 DC1722a F02 Figure 2. Efficiency with Burst Mode Operation at Light Loads 10mV/DIV DC1722a F03 2µs/DIV Figure 3. Output Ripple at 14V and 2A (10mV, 2µs/DIV, 20MHz) dc1722afa Arrow.com.
  • Page 5 DEMO MANUAL DC1722A QUICK START PROCEDURE 1A/DIV 50mV/DIV 100µs/DIV DC1722a F04 Figure 4. Transient Response Waveform at 14V and 1A - 2A - 1A (1A, 50mV,100µs/DIV) dc1722afa Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from...

  • Page 6: Parts List

    DEMO MANUAL DC1722A PARTS LIST ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components CIN1 CAP, 10μF 20% 63V ALUM SUN ELEC. 63HEH10M CIN2 CAP, 1210 2.2μF 10% 100V X7R MURATA GRM32ER72A225KA35L COUT1, COUT2 CAP, 1812 100μF 20% 6.3V X5R TDK C4532X5R0J107M COUT3 CAP, 0603 1μF 10% 6.3V X5R...

  • 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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