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DESCRIPTION
Demonstration circuit 1700A is a fast, high efficiency
synchronous buck DC/DC converter with 4.5V to 24V
input range. It can supply 15A maximum load current at
1.5V output. The demo board features the LTC
regulator. No external MOSFETs are required. The con-
trolled on-time constant frequency valley current mode
architecture allows for both fast transient response and
constant frequency switching in steady-state operation.
Differential output voltage sensing along with a precision
internal reference combine to offer an accurate output
regulation. The LTC3613 is ideal for applications such
as distributed power systems, servers and point-of-load
converters. The LTC3613EWKH is in a 7mm × 9mm 54-pin
QFN package.
PERFORMANCE SUMMARY
PARAMETER
Input Voltage Range
Output Voltage, V
OUT
Maximum Output Current, I
OUT
Typical Output Ripple
Typical Efficiency
Typical Switching Frequency
DEMO MANUAL DC1700A
The light load operation mode of the converter is de-
termined with the MODE/PLLIN pin. Use JP2 jumper to
select discontinuous mode (DCM) or forced continuous
®
3613EWKH
mode (CCM) operation. Switching frequency is pre-set
at about 350kHz. This frequency can be modified from
200kHz to 1MHz by changing the value of a resistor (R18).
The converter can also be externally synchronized from
200kHz to 1MHz through the MODE/PLLIN pin (PLLIN
terminal on the board). To shut down the converter, one
simple way is to force the RUN pin below 1.1V (JP1: OFF).
The power good output (PGOOD terminal) is low when the
output voltage is outside of the ±7.5% regulation window.
Design files for this circuit board are available at
http://www.linear.com/demo
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.
(T
= 25°C)
A
CONDITIONS
V
= 4.5V to 24V, I
= 0A to 15A
IN
OUT
V
= 4.5V to 24V, V
= 1.5V
IN
OUT
V
= 12V, I
= 15A (20MHz BW)
IN
OUT
V
= 12V, V
= 1.5V, I
= 15A
IN
OUT
OUT
LTC3613EWKH
Fast, High Efficiency
Step-Down Regulator
VALUE
4.5V to 24V
1.5V ±2%
15A
40mV
P–P
87.5%
350kHz
dc1700af
1
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Table of Contents
Related Manuals for Linear Technology DC1700A
Summary of Contents for Linear Technology DC1700A
- Page 1 Design files for this circuit board are available at QFN package. http://www.linear.com/demo 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 = 25°C)
- Page 2 DEMO MANUAL DC1700A QUICK START PROCEDURE Demonstration circuit 1700A is easy to set up to evaluate 5. Once the proper output voltages are established, ad- the performance of the LTC3613. Refer to Figure 1 for just the loads within the operating range and observe...
- Page 3 DEMO MANUAL DC1700A QUICK START PROCEDURE LOAD CURRENT (A) Figure 3. Efficiency vs Load Current (V = 12V, V = 1.5V, CCM) dc1700af...
- Page 4 DEMO MANUAL DC1700A PARTS LIST ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components CIN1, CIN2 CAP , 1210 10μF 10% 16V X5R AVX, 1210YD106KAT CIN4 CAP , 82μF , 25V, Sanyo SANYO, 25SVPD82M COUT1, COUT2 CAP , 1206 100μF 20% 6.3V X5R...
- Page 5 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.
- Page 7 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Analog Devices Inc. DC1700A...
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