DC2177A-B - Demo Manual

DEMO MANUAL DC2177A-B
LT3062
45V VIN, Micropower,
Low Noise, 200mA LDO
Description
Demonstration circuit 2177A-B features the LT®3062, a
micropower, low noise and low dropout voltage linear
regulator. The input voltage ranges from 2.1V to 45V and
the maximum output current is 200mA. A resistor divider
determines the output voltage, and a jumper adjusts the
divider to set the output voltage to either 1.2V, 1.5V, 1.8V,
2V, 2.5V, 3.3V, 5V or a voltage that is user-programmed
but requires the installation of a resistor. The output uses
a 10µF ceramic capacitor and the internal reference is
bypassed with a 10nF capacitor to reduce output noise
and program the soft-start. There is also a 10nF feedforward capacitor to improve load transient response and
decrease noise at higher output voltages. The position of
the VOUTEN jumper either pulls up the SHDN pin to the
input supply through a 100k resistor, shorts SHDN to
ground or floats the SHDN pin so it can be driven directly
by a signal applied to the SHDN terminal. The input supply
to the LT3062 is bypassed by a 2.2µF ceramic capacitor
Performance Summary
and there is also a 50V tantalum polymer capacitor on the
input to dampen ringing that may occur when the input is
hot-plugged using long leads.
The LT3062 saves energy by being micropower and low
dropout. The LT3062 has excellent regulation and fast
response to load transients and also tolerates wide input
voltage variations.
The LT3062 targets systems with inputs that are batterypowered or have multiple sources. DC2177A-B features
the LT3062 in the 8-lead 2mm × 3mm DFN package. The
LT3062 data sheet must be read in conjunction with this
demo manual to properly use or modify demo circuit
DC2177A-B.
Design files for this circuit board are available at
http://www.linear.com/demo
L, LT, LTC, LTM, 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 TA = 25°C
PARAMETER
CONDITIONS
Minimum Input Voltage, VIN
VIN – VOUT ≥ 360mV
MIN
TYP
MAX
2.1
45
Maximum Input Voltage, VIN
Output Voltage, VOUT
VOUT SELECT = 1.2V
VOUT SELECT = 1.5V
VOUT SELECT = 1.8V
VOUT SELECT = 2V
VOUT SELECT = 2.5V
VOUT SELECT = 3.3V
VOUT SELECT = 5V
1.17
1.47
1.76
1.97
2.43
3.23
4.85
Maximum Output Current, IOUT
VIN = 2.3V, VOUT = 1.8V
200
UNITS
V
V
1.2
1.5
1.8
2.0
2.5
3.3
5.0
1.23
1.54
1.85
2.07
2.56
3.41
5.13
V
V
V
V
V
V
V
mA
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DEMO MANUAL DC2177A-B
Quick Start Procedure
To use DC2177A-B to evaluate the performance of the
LT3062, refer to Figure 1 for the proper measurement
equipment setup and follow the procedure below:
1.With the input supply and load off and turned down,
make all connections according to Figure 1. Make sure
the jumper to set VOUT is in the proper position for the
desired output voltage and the VOUTEN jumper is in
the ON position.
2.Turn on the input supplies and increase them to the
desired input voltages.
3.Increase the load to the desired output current. Verify
that the VOUT voltage is as programmed by the jumper.
Note: If the output voltage is low, temporarily disconnect
the load to make sure that it is not set too high.
4.Once the proper output voltage is established, adjust the
input voltage and load within the operating range and
observe the output voltage regulation, low quiescent
current, shutdown operation and other parameters.
Note When Setting The Input Voltage: An input voltage
that is too close to the programmed output voltage (too
low) may cause dropout operation and a loss of output
voltage regulation. Also, an input voltage that is too high
above the output may increase power dissipation to an
unacceptable level.
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DEMO MANUAL DC2177A-B
Quick Start Procedure
Figure 1: Proper Measurement Equipment Setup for DC2177A-B
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DEMO MANUAL DC2177A-B
Parts List
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
Required Circuit Components
1
1
C1
Cap., X5R 2.2µF 50V 10% 1206
Murata GRM31CR61H225KA88K
2
1
C2
Cap., X7R 10µF 25V 20% 1206
TDK C3216X7R1E106MT
3
2
R1, R2
Res., Chip 60.4k 0.06W 1% 0402
Vishay CRCW040260K4FKED
4
1
U1
I.C., Low Dropout Reg. DFN(08)(DCB)2MMX3MM
Linear Tech. Corp. LT3062EDCB
Optional Demo Circuit Components
1
2
C3, C4
Cap., X7R 0.01µF 25V 10% 0603
AVX 06033C103KAT2A
2
1
C5
Cap., Tant. Polymer 10µF 50V 20% 7343
AVX TCJD106M050R0120
3
0
C6 (Opt)
Cap., 0805
4
0
C7 (Opt)
Cap., 7343
5
1
R3
Res., Chip 90.9k 0.06W 1% 0402
Vishay CRCW040290K9FKED
6
1
R4
Res., Chip 121k 0.06W 1% 0402
Vishay CRCW0402121KFKED
7
1
R5
Res., Chip 143k 0.06W 1% 0402
Vishay CRCW0402143KFKED
8
1
R6
Res., Chip 191k 0.06W 1% 0402
Vishay CRCW0402191KFKED
9
1
R7
Res., Chip 274k 0.06W 1% 0402
Vishay CRCW0402274KFKED
10
1
R8
Res., Chip 442k 0.06W 1% 0402
Vishay CRCW0402442KFKED
11
0
R9 (Opt)
Res., 0603
12
1
R10
Res., Chip 100k 0.06W 5% 0603
Vishay CRCW0603100KJNEA
Hardware
1
5
E1, E2, E3, E4, E5 Turret, Testpoint
Mill Max 2501-2-00-80-00-00-07-0
2
1
JP1
Headers, 2 x 8 (2mm Ctrs.)
Sullins NRPN082PAEN-RC
3
1
JP2
Headers, 4 Pins 2mm Ctrs.
Sullins NRPN041PAEN-RC
4
2
XJP1, XJP2
Shunt, 2mm Ctrs.
Samtec 2SN-BK-G
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VIN
E2
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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
1
C5
+ 10µF
50V
7343
C6
(Opt)
0805
R10
100k
5%
0603
C1
2.2µF
50V
1206
7
5
6
9
GND
SHDN
IN
IN
8
NOTES: UNLESS OTHERWISE SPECIFIED:
1. RESISTORS ARE 0402 1%,
CAPACITORS ARE 06O3.
ADJ
OUT
OUT
1
2
3
4
C3
0.01µF
GND REF/BYP
U1 LT3062EDCB
PERFORMANCE SUMMARY FOR
* SEE
MINIMUM INPUT VOLTAGE CONDITIONS
SHDN
4
EXT
E5
3
OFF
JP2
2
ON
VOUTEN
GND
E4
2.1V - 45V
*
R1
60.4k
C4
0.01µF
(Opt)
0603
R9
442k
R8
274k
R7
191k
R6
143k
R5
121k
R4
90.9K
R3
60.4k
R2
JP1
14
16
15
12
11
13
10
8
6
4
2
9
7
5
3
1
C2
10µF
25V
1206
USER SELECT
5.0V
3.3V
2.5V
2.0V
1.8V
1.5V
1.2V
VOUT
C7
(Opt)
7343
+
E3
E1
GND
200mA
VOUT
DEMO MANUAL DC2177A-B
Schematic Diagram
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DEMO MANUAL DC2177A-B
DEMONSTRATION BOARD IMPORTANT NOTICE
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. As a prototype, this product does not fall within the scope of the European Union
directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations.
If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date
of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU
OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS
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ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims
arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all
appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or
agency certified (FCC, UL, CE, etc.).
No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance,
customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.
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Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and
observe good laboratory practice standards. Common sense is encouraged.
This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC application engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation
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Linear Technology Corporation
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●
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