Linear Technology DC2177A-B Quick setup guide

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

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

Quick start proceDure

Figure 1: Proper Measurement Equipment Setup for DC2177A-B

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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



60.4k

OUT

SHDN

GND GND REF/BYP

ADJ

LT3062EDCB

(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

GND

(Opt)

0603

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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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

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