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DESCRIPTION
Demonstration circuit 1480A is a dual output synchronous
buck DC/DC converter featuring the LTC
input voltage range is from 4.5V to 14V. The outputs are
3.3V/5A and 1.8V/5A. Each output voltage can be precisely
programmed to a preset value within 1% error with the
VID pins. The demo board uses a high density, two sided
drop-in layout. The package of LTC3865EUH-1 is a small,
low thermal impedance 5mm × 5mm 32-Lead QFN.
The light load operation mode of the converter is de-
termined with the MODE/PLLIN pin. Use JP1 jumper to
select Burst Mode
operation, pulse-skipping mode or
®
PERFORMANCE SUMMARY
PARAMETER
Input Voltage Range
Output Voltage, V
OUT1
Output Voltage, V
OUT2
Maximum Output Current, I
OUT1
Maximum Output Current, I
OUT2
Typical Full Load Efficiency, Channel 1
Typical Full Load Efficiency, Channel 2
Typical Switching Frequency
DEMO MANUAL DC1480A
Dual 5A Synchronous Buck
Converter with Pin Selectable Outputs
forced continuous mode operation. Switching frequency
3865EUH-1. The
is preset at about 500kHz. This frequency can be modi-
®
fied by changing R5 value at the FREQ pin. The converter
can also be externally synchronized from 250kHz to
770kHz through MODE/PLLIN pin (SYNC terminal on the
board). To shut down a channel, force its RUN pin below
1.2V (Jumper: OFF). The power good output (PGOOD1
or PGOOG2 terminal) is low when that channel output
exceeds ±10% regulation window.
Design files for this circuit board are available at
http://www.linear.com/demo
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.
(T
= 25°C)
A
CONDITION
V
= 4.5V to 14V, I
= 0A to 5A
IN
OUT1
V
= 4.5V to 14V, I
= 0A to 5A
IN
OUT2
V
= 4.5V to 14V, V
= 3.3V
IN
OUT1
V
= 4.5V to 14V, V
= 1.8V
IN
OUT2
V
= 12V, V
= 3.3V, I
IN
OUT1
OUT1
V
= 12V, V
= 1.8V, I
IN
OUT2
OUT2
LTC3865EUH-1
VALUE
4.5V to 14V
3.3V ±1%
1.8V ±1%
5A
5A
= 5A
91.6%
= 5A
86.6%
500kHz
dc1480af
1
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Related Manuals for Linear Technology DC1480A
Summary of Contents for Linear Technology DC1480A
- Page 1 Burst Mode operation, pulse-skipping mode or http://www.linear.com/demo ® 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. PERFORMANCE SUMMARY = 25°C)
- Page 2 DEMO MANUAL DC1480A QUICK START PROCEDURE Demonstration circuit 1480A is easy to set up to evaluate 5. Once the proper output voltages are established, the performance of the LTC3865EUH-1. Refer to Figure 1 adjust the loads within the operating range and observe...
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Page 3: Quick Start Procedure
DEMO MANUAL DC1480A QUICK START PROCEDURE Rail Tracking Demonstration circuit 1480A is configured for independent to track an external signal. It can also be modified OUT1 turn-on of V and V . The ramp rate for V to allow V... - Page 4 DEMO MANUAL DC1480A QUICK START PROCEDURE – 1480a F02 Figure 2. Measuring Output Voltage Ripple = 12V = 12V = 3.3V = 1.8V = 5A MAX = 5A MAX LOAD LOAD 0.01 0.01 LOAD CURRENT (A) LOAD CURRENT (A) 1480a F03 1480a F04 Figure 3.
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Page 5: Parts List
Res, Chip 15k 0.06W 5% 0603 Vishay CRCW060315K0JNEA R19, R22 Res, Chip 100k 0.06W 5% 0603 Vishay CRCW0603100KJNEA IC, Voltage Regulator QFN (32) (UH) 5mm × 5mm Linear Technology LTC3865EUH-1 Additional Circuit Components CIN5,CIN4 Cap, 0805 Cap, 0603 Q3, Q4... - Page 6 DEMO MANUAL DC1480A SCHEMATIC DIAGRAM dc1480af...
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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 representation 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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