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DESCRIPTION
Demonstration circuit 1821B features the
wide operating range synchronous monolithic buck-boost
converter with programmable average output current.
The DC1821B demo board has two user selectable operat-
ing modes: Burst Mode
®
PWM (JP2). There is also an accurate programmable RUN
pin which is used to ENABLE the converter (JP1).
The LTC3114-1 uses average current mode control to
simplify voltage loop compensation and provide good line
and load transient response.
The DC1821B operates with a 2.7V to 40V input volt-
age range. The demo board has been designed with the
output voltage set to 5V. The LTC3114-1 incorporates a
proprietary low noise switching algorithm which optimizes
efficiency with input voltages above, below or equal to the
output voltage and ensures seamless transitions between
operating modes.
PERFORMANCE SUMMARY
PARAMETER
Input Voltage Range
V
OUT
I
(See Note 1)
OUT
Efficiency
NOTE 1: The demo board output current is a function of V
40V, 1A Synchronous Buck-Boost DC/DC
Converter with Output Current Limit
LTC
3114-1, a
®
operation and Fixed Frequency
Specifications are at T
. Please refer to the data sheet for more information.
IN
DEMO MANUAL DC1821B
LTC3114EDHC-1
In PWM mode, the LTC3114-1 operates at 1.2MHz to
optimize small size with high efficiency operation.
The demo board also incorporates diode D1 to backfeed
V
to improve efficiency in some applications. If the
CC
demo board output voltage is changed to a higher volt-
age, D1 should be removed. Consult the data sheet for
more information.
Figure 1 shows typical demo board efficiency. Figure 2
shows the response to an input voltage step while Figure 3
shows the load step response.
The LTC3114-1 data sheet has detailed information about
the operation, specifications, and applications of the part.
The data sheet should be read in conjunction with this
Quick Start Guide.
Design files for this circuit board are available at
http://www.linear.com/demo/DC1821B
L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners.
= 25°C
A
1A for V
TYP
2.7V to 40V
5V
> 6V
IN
See Figure 1
dc1821bf
1
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Related Manuals for Linear Technology DC1821B
Summary of Contents for Linear Technology DC1821B
- Page 1 L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode 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 Auto Burst Mode Operation 250mA LOAD 500mA LOAD 750mA LOAD 1A LOAD dc1821a F01 Figure 1. DC1821B Efficiency in Auto Burst Mode Operation : 500mV/DIV : 5V/DIV dc1821a F02 Figure 2. DC1821B Input Voltage Step Response. V Stepped from 3.3V to 12V I...
-
Page 3: Quick Start Procedure
DEMO MANUAL DC1821B QUICK START PROCEDURE Using short twisted pair leads for any power connections 3. Connect a 500mA load to V as shown in Figure 4 and with all loads and power supplies off, refer to Figure 4 (10Ω for V = 5V). -
Page 4: Parts List
DEMO MANUAL DC1821B PARTS LIST ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components C1, C2 CAP CER 0.068μF 16V 10% X7R 0402 TDK, C1005X7R1C683K CAP CER 4.7μF 6.3V X5R 20% 0603 TDK, C1608X5R0J475M C4, C13 CAP CER 22μF 25V X7R 20% 1812 TDK, C4532X7R1E226M CAP CER 1.0μF 25V X5R 0603... -
Page 5: 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 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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