Linear Technology DC2177A-B Guida rapida alla configurazione
1
dc2177abf
DEMO MANUAL DC2177A-B
Description
LT3062
45V VIN, Micropower,
Low Noise, 200mA LDO
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
a10µF 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 feedfor-
ward 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 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.
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 battery-
powered 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
performance summary
Specifications are at TA= 25°C
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Input Voltage, VIN VIN – VOUT ≥ 360mV 2.1 V
Maximum Input Voltage, VIN 45 V
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
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
Maximum Output Current, IOUT VIN = 2.3V, VOUT = 1.8V 200 mA
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dc2177abf
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.
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.
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. Oncetheproperoutputvoltageisestablished,adjustthe
input voltage and load within the operating range and
observe the output voltage regulation, low quiescent
current, shutdown operation and other parameters.
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dc2177abf
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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dc2177abf
DEMO MANUAL DC2177A-B
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.
schematic Diagram
R2
60.4k
IN
IN
OUT
OUT
SHDN
GND GND REF/BYP
ADJ
U1
LT3062EDCB
8
2
1
7
35
9
46
+
C7
(Opt)
7343
NOTES: UNLESS OTHERWISE SPECIFIED:
1. RESISTORS ARE 0402 1%,
CAPACITORS ARE 06O3.
E2
VIN
2.1V - 45V
*
R3
90.9K
E4
GND
E5
SHDN
R4
121k
R5
143k
R6
191k
R7
274k
E1
VOUT
200mA
E3
GND
R9
(Opt)
0603
R8
442k
SEE PERFORMANCE SUMMARY FOR
MINIMUM INPUT VOLTAGE CONDITIONS
JP1
1.2V
1.5V
1.8V
2.0V
2.5V
3.3V
5.0V
USER SELECT
VOUT
1
3
2
4
5 6
7 8
910
11 12
13 14
15 16
+
C5
10µF
50V
7343
C3
0.01µF
C4
0.01µF
*
C6
(Opt)
0805
JP2
ON
OFF
EXT
VOUTEN
1
3
2
4
C1
2.2µF
50V
1206
R1
60.4k
C2
10µF
25V
1206
R10
100k
5%
0603
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dc2177abf
DEMO MANUAL DC2177A-B
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ●FAX: (408) 434-0507 ●www.linear.com
LINEAR TECHNOLOGY CORPORATION 2014
LT 0714 • PRINTED IN USA
DEMONSTRATION BOARD IMPORTANT NOTICE
Linear Technology Corporation (LT C ) 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 LT C 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
FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR
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 LT C 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. LT C assumes no liability for applications assistance,
customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.
LT C currently services a variety of customers for products around the world, and therefore this transaction is not exclusive.
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 LT C applica-
tion engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation
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