Linear Technology LT3066 Quick setup guide

dc2437af

DEMO MANUAL DC2437A

Description

LT3066

45V, 500mA Low Noise

Linear Regulator with Programmable

Current Limit and Active Output Discharge

Demonstration circuit 2437A is an adjustable 500mA

linear regulator featuring the LT

3066. The LT3066 is a

micropower, low noise and low dropout voltage linear

regulator that operates over a 1.8V to 45V input voltage

range. The device supplies 500mA of output current with

a typical dropout voltage of 300mV. A 10nF bypass ca-

pacitor reduces output noise to 25µVRMS across a 10Hz

to 100kHz bandwidth and soft-starts the reference. The

LT3066’s ±45V input voltage rating combined with its

precision current limit make the IC an ideal choice for

robust, high reliability applications. LT3066 features an

NMOS pull-down that discharges the output if SHDN or

IN is driven low.

The LT3066’s current limit can be programmed by a single

resistor, accurate to ±10% over a wide input voltage and

temperature range. The internal current limit should be

considered when the input-to-output differential is high.

LT3066has a PWRGD pin which goes high whentheoutput

rises above 90% of its nominal value. If the output falls

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.

performance summary

below 88.4% of its nominal value for more than 25µs, the

PWRGD pin asserts low. The use of a feedforward cap may

cause the PWRGD flag to assert early during a start-up

transient. To avoid this, ensure that the REF/BYP capaci-

tor is significantly larger than the feedforward capacitor.

The LT3066 optimizes stability and transient response

with low ESR ceramic capacitors, requiring a minimum

capacitance of 3.3µF.

The LT3066 is available in thermally-enhanced 12-Lead

4mm × 3mm DFN and MSOP packages.

The LT3066 data sheet gives a complete description of

the device, operation and application information. The

data sheet must be read in conjunction with this quick

start guide for demo circuit 2437A.

Design files for this circuit board are available at

http://www.linear.com/demo/DC2437A

Specifications are at TA= 25°C

PARAMETER CONDITIONS MIN TYP MAX

Input Voltage Range (V) VOUT = 3.3V 3.9 45

Output Voltage VOUT (V) Header in JP1

Header in JP2

Header in JP3

Header in JP4

Header in JP5

Header in JP6

Header in JP7

1.176

1.46

1.75

1.94

2.43

3.23

4.85

1.2

1.5

1.8

1.99

2.5

3.32

4.99

1.22

1.54

1.74

2.04

2.57

3.41

5.13

Maximum Output Current (mA) VIN = 5V, VOUT = 3.3V, R10 = 604Ω 445 497 545

dc2437af

DEMO MANUAL DC2437A

Quick start proceDure

Demonstration circuit 2437 is easy to set up to evaluate

the performance of the LT3066. Refer to Figure 1 for

proper measurement equipment setup and follow the

procedure below:

NOTE: Make sure that the input voltage does not exceed

45V.

NOTE: The shutdown jumper JP2 shunt is required to be

placed in the OFF or ON position for proper operation.

NOTE: Place the output voltage selection jumper JP1 at

the desired position.

NOTE: Do not hot-plug the input voltage terminal VIN. The

absolute maximum voltage on VIN is 50V and hot-plugging

a power supply through wire leads to the demonstration

circuit can cause the voltage on the extremely low ESR

ceramic input capacitor to ring to twice its DC value. In

order to protect the IC, a higher ESR Aluminum Electro-

lytic capacitor is placed at the input terminals. This may

protect against some, but not all, input transients due to

hot-plugging with a power supply. See Application Note

88 for more details.

NOTE: Connect the power supply (with power off), load,

and meters as shown in Figure 1.

1. After all connections are made, turn on the input power

and verify the output voltage according to the output

voltage selection jumper JP1. If the output voltage is

different from the above values, use the USER option

and install R8. Select R8 according to the following

equation:

R8 = (VOUT/0.6 – 1) •61.9k

NOTE: If the output voltage is too low, temporarily

disconnect the load to make sure that the load is not

set too high.

2. Once the proper output voltage is established, adjust the

load within the operating range and observe the output

voltage regulation, PWRGD and other parameters.

dc2437af

DEMO MANUAL DC2437A

Quick start proceDure

Figure 1. Proper Measurement Equipment Setup

Figure 2. Measuring Input or Output Ripple

OUT

GND

dc2437af

DEMO MANUAL DC2437A

parts List

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 C2 CAP, 10µF, X7R, 50V, 10%, 1210 MURATA, GRM32ER71H106KA12L

2 3 C3, C4, C5 CAP, 3.3µF, X7R, 25V, 10%, 0805 MURATA, GRM21BR71E335KA73L

3 2 C6, C7 CAP, 0.01µF, X7R, 16V, 10%, 0603 AVX, 0603YC103KAT2A

4 1 C8 CAP, 0.022µF, X7R, 16V, 10%, 0603 MURATA, GRM188R71C223KA01D

5 1 C9 CAP, 0.47µF, X7R, 50V, 10%, 0603 TDK, C1608X7R1H474K080AC

6 2 R1, R9 RES, 61.9kΩ, 1%, 1/10W, 0603 VISHAY, CRCW060361K9FKEA

7 1 R2 RES, 93.1kΩ, 1%, 1/10W, 0603 VISHAY, CRCW060393K1FKEA

8 1 R3 RES, 124kΩ, 1%, 1/10W, 0603 PANASONIC, ERJ3EKF1243V

9 1 R4 RES, 143kΩ, 1%, 1/10W, 0603 VISHAY, CRCW0603143KFKEA

10 1 R5 RES, 196kΩ, 1%, 1/10W, 0603 VISHAY, CRCW0603196KFKEA

11 1 R6 RES, 280kΩ, 1%, 1/10W, 0603 VISHAY, CRCW0603280KFKEA

12 1 R7 RES, 453kΩ, 1%, 1/10W, 0603 VISHAY, CRCW0603453KFKEA

13 1 R10 RES, 604Ω, 1%, 1/10W, 0603 VISHAY, CRCW0603604RFKEA

14 1 R11 RES, 499kΩ, 1%, 1/10W, 0603 PANASONIC, ERJ3EKF4993V

15 1 U1 IC, LOW NOISE LINEAR REGULATOR, 4MM × 3MM, DFN LINEAR TECHNOLOGY, LT3066EDE#PBF

Additional Demo Board Circuit Components

1 0 C1 (OPT) CAP, OPTION, ALUM ELECT, SMD

2 0 R8, R12, R13, R14

(OPT)

RES, OPTION, 0603

Hardware: For Demo Board Only

1 6 E1, E2, E3, E4, E5,

TEST POINT, TURRET, 0.094", MTG HOLE MILL-MAX, 2501-2-00-80-00-00-07-0

2 1 JP1 CONN, HEADER, MALE, 2X8, 2MM, THT SAMTEC, TMM-108-02-L-D

3 1 JP2 CONN, HEADER, MALE, 1X3, 2MM, THT SAMTEC, TMM-103-02-L-S

4 2 XJP1, XJP2 CONN, SHUNT, FEMALE, 2 POS, 2MM SAMTEC, 2SN-BK-G

dc2437af

DEMO MANUAL DC2437A

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

dc2437af

DEMO MANUAL DC2437A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

(408) 432-1900 ●FAX: (408) 434-0507 ●www.linear.com

LT 0116 • PRINTED IN USA

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

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 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.

LTC 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 LTC application

engineer.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035

Mouser Electronics

Authorized Distributor

Click to View Pricing, Inventory, Delivery & Lifecycle Information:

Analog Devices Inc.:

DC2437A

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