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DESCRIPTION
Demonstration circuit 1859A is a dual phase single out-
put DC/DC boost converter featuring the
DC1859A operates over 1.8V to 5.5V input and generates
12V at up to 1.5A from a 5V input. The maximum output
current for a 1.8V input is 750mA. Also, the LTC3124 has
a 2% precise voltage reference, which can generate an
output voltage with 2.2% tolerance if 0.1% voltage divider
resistors are used. The 1MHz switching frequency opera-
tion results in small and efficient circuit. The converter
operates with only one phase in Burst Mode
PERFORMANCE SUMMARY
PARAMETER
Minimum Input Voltage
Maximum Input Voltage
V
OUT
Output Voltage Ripple
Nominal Switching Frequency
DEMO MANUAL DC1859A
Dual Phase Synchronous
Step-Up DC/DC Converter
and achieves over 90% efficiency with a 100mA load. The
LTC
3124. The
demonstration circuit can be easily modified to generate
®
different output voltages.
The DC1859 has small circuit footprint. It is a high perfor-
mance and cost effective solution for generating output
voltages up to 15V from inputs as low as 1.8V.
Design files for this circuit board are available at
http://www.linear.com/demo/DC1859A
operation
®
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
CONDITION
I
= 0A to 0.75A
OUT
I
= 0A to 1.5A
OUT
V
= 1.8V to 5.5V, I
= 0A
IN
OUT
V
= 5V, I
= 1.5A
IN
OUT
= 25°C
A
MIN
LTC3124
TYP
MAX
UNITS
1.8
V
5.5
V
12
V ±4%
100
mV
P-P
1
MHz
dc1859afa
1
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Related Manuals for Linear Technology LTC3124
Summary of Contents for Linear Technology LTC3124
- Page 1 Burst Mode operation ® 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 Specifications are at T = 25°C...
- Page 2 Demonstration circuit 1859 is easy to set up to evaluate 3. Turn the input power source on and slowly increase the the performance of the LTC3124. For proper measure- input voltage. Be careful not to exceed 5.5V. ment equipment setup refer to Figure 1 and follow the...
- Page 3 Burst Mode OPERATION PWM MODE Figure 4. The LTC3124 Has Excellent Load Step Response with Small Output Capacitors Thanks to High Switching Frequency and Fast Feedback Loop Compensation = 2.6V...
-
Page 4: Parts List
DEMO MANUAL DC1859A QUICK START PROCEDURE Output Short Circuit Protection The LTC3124 features safe short-circuit and thermal protection. The part can operate continuously with output shorted while maintaining a maximum set current limit. The peak switch current is reduced during overload to about 2A and is restored to 3.5A once the output exceeds 1.5V. - 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.
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