Linear Technology DC2177A-C Guida rapida alla configurazione

dc2177acf

DEMO MANUAL DC2177A-C

DESCRIPTION

LT3063

45V VIN, Micropower,

Low Noise, 200mA LDO

with Output Discharge

Demonstration circuit 2177A-C features the LT

3063, a

micropower, low noise and low dropout voltage linear

regulator with output discharge. 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 re-

sistor, 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 LT3063 is bypassed by a

2.2µF ceramic capacitor 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 LT3063 saves energy by being micropower and low

dropout. The LT3063 has excellent regulation and fast

response to load transients and also tolerates wide input

voltage variations and discharges its output in a controlled

manner as required by some image sensor loads.

The LT3063 targets systems with inputs that are battery-

powered or have multiple sources, especially those with

sensitive loads. DC2177A-C features the LT3063 in the

8-lead 2mm ×3mm DFN package. The LT3063 data sheet

must be read in conjunction with this demo manual to

properly use or modify demo circuit DC2177A-C.

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

Maximum Output Current, IOUT VIN = 2.3V, VOUT = 1.8V 200 mA

Output Discharge Time VOUT = 2.9V, COUT = 10µF 750 µs

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dc2177acf

DEMO MANUAL DC2177A-C

QUICK START PROCEDURE

To use DC2177A-C to evaluate the performance of the

LT3063, 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, output discharge operation and

other parameters.

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dc2177acf

DEMO MANUAL DC2177A-C

QUICK START PROCEDURE

Figure 1: Proper Measurement Equipment Setup for DC2177A-C

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dc2177acf

DEMO MANUAL DC2177A-C

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. LT3063EDCB

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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dc2177acf

DEMO MANUAL DC2177A-C

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



60.4k

OUT

SHDN

GND GND REF/BYP

ADJ

U1 LT3063EDCB

(Opt)

7343

NOTES: UNLESS OTHERWISE SPECIFIED:

1. RESISTORS ARE 0402 1%,

CAPACITORS ARE 06O3.

VIN

2.1V - 45V

90.9K

GND

SHDN

121k

143k

191k

274k

VOUT

200mA

(Opt)

0603

GND

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

5 6

7 8

910

11 12

13 14

15 16

10µF

50V

7343

0.01µF

(Opt)

0805

JP2

OFF

EXT

VOUTEN

2.2µF

50V

1206

60.4k

10µF

25V

1206

R10

100k

0603

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dc2177acf

DEMO MANUAL DC2177A-C

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

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