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Linear Technology DC1733A Demo Manual
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Linear Technology DC1733A Demo Manual

Lt3669 industrial transceiver with integrated step-down regulator and ldo
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DESCRIPTION
Demonstration circuit 1733A is an industrial transceiver
with integrated step-down regulator and LDO featuring the
LT
3669. The board operates from 7.5V to 40V when JP7 is
®
set to L + . When the JP7 is set to RES, the minimum input
voltage is 16.5V. The board withstands transients up to
60V. The step-down regulator output is 5V. The LDO output
is 3.3V. There are two assembly versions. DC1733A-A is
for the LT3669 and DC1733A-B is for the LT3669-2. The
difference is the LT3669 has an integrated catch diode.
The LT3669-2 requires an external catch diode. Table 1
shows the differences between the two versions.
PERFORMANCE SUMMARY
SYMBOL
PARAMETER
L +
Input Supply
V
Output Voltage
BUCK
V
Output Voltage
LDO
I
Maximum Buck Output Current
BUCK
I
Maximum LDO Output Current
LDO
FSW
Switching Frequency
EFF
Efficiency
TRST
Reset Timeout Period
Table 1. Version Table
ASSY TYPE
U1
DC1733A-A
LT3669EUFD
DC1733A-B
LT3669EUFD-2
DEMO MANUAL DC1733A
Industrial Transceiver with Integrated
Step-Down Regulator and LDO
The board also provides various interfaces for line drivers
and receivers. JP8 to JP11 set the signal sources or levels
for TXEN1, TXEN2, TXD1 and TXD2.
The LT3669 data sheet gives complete descriptions of the
part, operation and application information. The data sheet
must be read in conjunction with this quick start guide for
working on or modifying the demo circuit 1733A.
Design files for this circuit board are available.
Call the LTC Factory.
L, LTC, LTM, LT, Burst Mode are registered trademarks of Linear Technology Corporation.
Other product names may be trademarks of the companies that manufacture the products..
Specifications are at T
CONDITIONS
Step-Down Regulator
LDO
LT3669, Step-Down Regulator V
LT3669-2, Step-Down Regulator V
LT3669, VLDO = 3.3V
LT3669-2, VLDO = 3.3V
LT3669, L + = 12V, V
BUCK
LT3669-2, L + = 12V, V
BUCK
C5=100nF
I
I
C8
LDO
BUCK
0.1A
0.1A
10µF
0.15A
0.3A
22µF
= 25°C
A
MIN
7.5
4.75
3.135
= 5V
100
BUCK
= 5V
300
BUCK
100
150
= 5V, I
= 100mA
BUCK
= 5V, I
= 300mA
BUCK
C9
D6
0.1µF
OPEN
0.22µF
DFLS160
LT3669
TYP
MAX
UNITS
40
V
5
5.25
V
3.3
3.465
V
mA
mA
mA
mA
600
kHz
65
%
76
%
12.5
ms
L1
82µH, CDRH4D22HPNP-820MC
33µH, CDRH50D28RNP-330MC
dc1733af
1

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Summary of Contents for Linear Technology DC1733A

  • Page 1 The LT3669-2 requires an external catch diode. Table 1 shows the differences between the two versions. L, LTC, LTM, LT, Burst Mode are registered trademarks of Linear Technology Corporation. Other product names may be trademarks of the companies that manufacture the products..
  • Page 2 DEMO MANUAL DC1733A QUICK START PROCEDURE Demonstration circuit 1733A is easy to set up to evaluate 5. Turn on the power at the input. the performance of the LT3669 or the LT3669-2. Refer to 6. Check for the proper output voltages.

  • Page 3: Quick Start Procedure

    DEMO MANUAL DC1733A QUICK START PROCEDURE Figure 1. Proper Measurement Equipment Setup Figure 2. Measuring Input or Output Ripple dc1733af...

  • Page 4: Parts List

    RES., CHIP, 53.6K, 1/16W, 1% 0402 VISHAY, CRCW040253K6FKED RES., CHIP, 10.2K, 1/16W, 1% 0402 VISHAY, CRCW040210K2FKED RES., CHIP, 38.3K, 1/16W, 1% 0402 VISHAY, CRCW040238K3FKED DC1733A-A Version Specific Components CAP., X5R, 10µF, 6.3V, 10% 0805 MURATA, GRM219R60J106KE19D CAP., X7R, 0.1µF, 10V, 10% 0402 TDK, C1005X7R1A104K D6(OPEN) DIODE, POWER-DI-123 INDUCTOR, 82µH...

  • 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.
  • Page 7 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Analog Devices Inc. DC1733A-B DC1733A-A...