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DESCRIPTION
Demonstration circuit 2057A is a high input voltage, 250mA
output DC/DC power supply featuring the
IC operates with high efficiency Burst Mode
and includes an internal high side power MOSFET. The
board will accept an input voltage between 4V and 140V,
and provide jumper selected output voltages of 1.8V,
3.3V, 5V with an option for additional voltages. The IC
includes internal soft-start and a provision for increasing
soft-start time.
Included on the board is an ON/OFF jumper that can
also be configured as a precision undervoltage lockout.
Additional PC pads are included for programming current
limit to optimize efficiency and for reducing output voltage
ripple and reducing component size. A terminal (FBO)
is included to allow multiple boards to be paralleled for
higher output current.
PERFORMANCE SUMMARY
PARAMETER
Input Voltage Range
1.8V Output Voltage
3.3V Output Voltage
5V Output Voltage
Maximum Output Current, I
OUT
Typical Efficiency
Typical Output Ripple
DEMO MANUAL DC2057A
High Efficiency, High V
250mA Step-Down Converter
Output voltages between 800mV and V
LTC
3638. The
grammed using optional resistors (higher voltage rating
®
operation
output capacitors may be required).
®
The LTC3638 data sheet gives a complete description of the
IC operation and application information. The data sheet
must be read in conjunction with this quick start guide.
Design files for this circuit board are available at
http://www.linear.com/demo
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.
Specifications are at T
CONDITION
V
= 12V, I
= 0A to 250mA
IN
OUT
V
= 12V, I
= 0A to 250mA
IN
OUT
V
= 12V, I
= 0A to 250mA
IN
OUT
V
= 4V to 140V, V
= 1.8V, 3.3V or 5V
IN
OUT
V
= 12V, V
= 5V, I
= 250mA
IN
OUT
OUT
V
= 140V, V
= 5V, I
= 100mA (20MHz BW) 81mV
IN
OUT
OUT
LTC3638EMSE
= 25°C
A
VALUE
4V to 140V
1.8V ±2%
3.3V ±2%
5V ±2%
250mA
83.7%
P-P
,
IN
can be pro-
IN
dc2057af
1
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Table of Contents
Related Manuals for Linear LTC3638EMSE
Summary of Contents for Linear LTC3638EMSE
- Page 1 Included on the board is an ON/OFF jumper that can 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 also be configured as a precision undervoltage lockout.
- Page 2 DEMO MANUAL DC2057A QUICK START PROCEDURE Demonstration circuit 2057A is easy to set up to evaluate 7. With power off, move jumpers JP1 and JP2 to the other the performance of the LTC3638. Refer to Figure 1 for fixed voltage settings (1.8V or 3.3V). Repeat steps 5 the proper measurement equipment setup and follow the and 6.
- Page 3 DEMO MANUAL DC2057A QUICK START PROCEDURE Figure 1. Proper Measurement Equipment Setup – COUT VOUT Figure 2. Measuring Output Voltage Ripple dc2057af...
- Page 4 DEMO MANUAL DC2057A QUICK START PROCEDURE LTC3638 1.8V Efficiency vs Load Current LTC3638 3.3V Efficiency vs Load Current dc2057af...
- Page 5 DEMO MANUAL DC2057A QUICK START PROCEDURE LTC3638 5V Efficiency vs Load Current dc2057af...
-
Page 6: Parts List
AVX, 06033C104KAT2A DIODE, SBR1U200P1 DIODES, SBR1U200P1-7 INDUCTOR, 150µH SUMIDA, CDRH105R-151 RES., CHIP, 2M, 1/16W, 5% 0603 VISHAY, CRCW06032M00JNEA IC., LTC3638EMSE MSE16(12), 4X3MM LINEAR TECH., LTC3638EMSE Additional Demo Board Circuit Components C3 (OPT) CAP., 0603 C8, C10 (OPT) CAP., 1210 R2, R4, R7, R8 (OPT) RES., 0603... - Page 7 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 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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