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DESCRIPTION
Demonstration circuit 1881A is a high efficiency syn-
chronous buck-boost DC/DC converter with 6V to 36V
input range. It can supply 2.5A maximum load current at
12V output. The demo board features the LTC
controller. The constant-frequency current mode architec-
ture allows a phase-lockable frequency of up to 600kHz,
while an optional output current feedback loop provides
support for applications such as battery charging. With a
wide input range, wide output range and seamless trans-
fers between operation modes, the LTC3789 is ideal for
automotive, telecom, distributed DC power systems and
battery-powered applications. This board has a compact
solution size with dual SO-8 MOSFETs, small inductor and
capacitor footprints. The package of LTC3789EUFD is a
small, low thermal impedance 4mm × 5mm 28-Lead QFN.
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 DC1881A
High Efficiency Compact
The light load operation mode of the converter is determined
with the MODE/PLLIN pin. Use the JP2 jumper to select
pulse skipping mode or forced continuous mode (CCM)
®
3789EUFD
operation. Switching frequency is preset at about 400kHz.
The converter can also be externally synchronized 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 1.2V (JP1: OFF). The power good output
(PGOOD terminal) is low when the output voltage is outside
of the ±10% regulation window.
Design files for this circuit board are available at
http://www.linear.com/demo
L, LT, LTC, LTM, μModule, Linear Technology 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
= 25°C
A
CONDITION
V
= 6V to 36V, I
= 0A to 2.5A
IN
OUT
V
= 6V to 36V, V
= 12V
IN
OUT
V
= 36V, I
= 12A (20MHz BW)
IN
OUT
V
= 12V, V
= 12V, I
IN
OUT
OUT
LTC3789EUFD
Buck-Boost Converter
= 2.5A
VALUE
6V to 36V
12V ±2%
2.5A
44mV
P-P
97.2%
400kHz
dc1881af
1
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Related Manuals for Linear Technology DC1881A
Summary of Contents for Linear Technology DC1881A
- Page 1 SO-8 MOSFETs, small inductor and L, LT, LTC, LTM, μModule, Linear Technology and the Linear logo are registered trademarks of capacitor footprints. The package of LTC3789EUFD is a Linear Technology Corporation. All other trademarks are the property of their respective owners.
-
Page 2: Quick Start Procedure
DEMO MANUAL DC1881A QUICK START PROCEDURE Demonstration circuit 1881A is easy to set up to evaluate Note: When measuring the output or input voltage ripple, the performance of the LTC3789. Refer to Figure 1 for do not use the long ground lead on the oscilloscope probe. -
Page 3: Parts List
DEMO MANUAL DC1881A QUICK START PROCEDURE – Figure 2. Measuring Output Voltage Ripple = 12V = 24V = 6V = 36V LOAD CURRENT (A) DC1881 F03 Figure 3. Efficiency vs Load Current (V = 12V, CCM) PARTS LIST ITEM REFERENCE... - Page 4 DEMO MANUAL DC1881A PARTS LIST ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER C9, C25, C26 CAP., X7R, 10μF, 50V, 20% 1210 TDK, C3225X7S1H106M CAP., X5R, 10μF, 6.3V, 20% 1206 AVX, 12066D106MAT2A D4-D7 SCHOTTKY REC., DFLS160, POWER DI-123 DIODE INC., DFLS160 ZENER DIODE, 5.1V, BZX84C5V1, SOT23 DIODES INC., BZX84C5V1-7-F...
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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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