Linear Technology DC1992A Quick setup guide

dc1992af

DEMO MANUAL DC1992A

Description

LT8620

65V, 2A Micropower Synchronous

Monolithic Step-Down Regulator

Demonstration circuit 1992A is a 65V, 2A micropower

synchronous monolithic step-down regulator featuring

the LT

8620. The LT8620 is a compact, high efficiency,

high speed synchronous monolithic step-down switching

regulator that consumes only 2.5µA of quiescent current

when output is regulated at 5V. Top and bottom power

switches,compensationcomponentsandother necessary

circuits are inside of the LT8620 to minimize external

components and simplify design.

The SYNC pin on the demo board is grounded by default

for low ripple Burst Mode

operation. To synchronous

to an external clock, move JP1 to SYNC and apply the

external clock to the SYNC turret. Once JP1 is on SYNC

position, a DC voltage of higher than 2V or INTVCC can

be applied to the SYNC turret pulse skipping operation.

Figure 1 shows the efficiency of the circuit at 12V input.

L, LT, LTC, LTM, Linear Technology, Burst Mode and the Linear logo are registered trademarks

of Linear Technology Corporation. All other trademarks are the property of their respective

owners.

performance summary

The demo board has an EMI filter installed. The board and

the IC are designed to minimize conducted and radiated

EMI.TheradiatedEMIperformances of the boardare shown

on Figure 2 to Figure 4. The limits on those figures are

CISPR25, Class 5 peak limits. It shows the circuit passes

the test with a wide margin.

The LT8620 data sheet gives a complete description of

the part, operation and application information. The data

sheet must be read in conjunction with this quick start

guide for demo circuit 1992A.

Design files for this circuit board are available at

http://www.linear.com/demo/DC1992A

Specifications are at TA= 25°C

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

VIN Input Supply Range 5.5 65 V

VOUT Output Voltage 4.8 5 5.2 V

IOUT Maximum Output Current 2 A

fSW Switching Frequency 1.85 2 2.15 MHz

EFE Efficiency at DC IOUT = 1A 92 %

Figure 1. LT8620 12VIN to 5VOUT Efficiency at 2MHz Switching Frequency

LOAD CURRENT (A)

EFFICIECNY (%)

100

60 1.00.5 1.5

dc1992a F01

2.0

dc1992af

DEMO MANUAL DC1992A

Figure 3. 30MHz to 1GHz Radiated EMI Performance. VIN = 12V, VOUT = 5V, IOUT = 2A

Antenna Polarization: Vertical; Switching Frequency: 2MHz

Figure 2. 30MHz to 1GHz Radiated EMI Performance. VIN = 12V, VOUT = 5V, IOUT = 2A

Antenna Polarization: Horizontal; Switching Frequency: 2MHz

Description

Figure 4. 150kHz to 30MHz Radiated EMI Performance. VIN = 12V, VOUT = 5V, IOUT = 2A

Antenna Polarization: Vertical; Switching Frequency: 2MHz

(In the Frequency Range Between 150kHz and 30MHz, Only Vertical Polarization Is Required)

dc1992af

DEMO MANUAL DC1992A

Demonstration circuit 1992A is easy to set up to evalu-

ate the performance of the LT8620. Refer to Figure 5 and

Figure 6 for proper measurement equipment setup and

follow the procedure below:

1. With power off, connect the input power supply to VIN

and GND.

2. With power off, connect the load VOUT and GND.

3. Check JP1 setting

4. Turn on the power at the input.

5. Carefully evaluate other design parameters as needed.

Quick start proceDure

Figure 5. Proper Measurement Equipment Setup

Figure 6. Measure Output Ripple

dc1992af

DEMO MANUAL DC1992A

parts List

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 C2 CAP., X7R, 2.2µF, 100V, 10%, 1206 MURATA, GRM31CR72A225K

2 1 C4 CAP., X7R, 0.1µF, 16V, 10%, 0402 MURATA, GRM155R71C104KA88D

3 1 C5 CAP., C0G, 10pF, 25V, 10%, 0603 AVX, 06033A100KAT2A

4 1 C6 CAP., X7R, 47µF, 10V, 10%, 1210 MURATA, GRM32ER71A476KE2015L

5 1 C7 CAP., X5R, 1.0µF, 10V, 10%, 0402 MURATA, GRM155R61A105K

6 1 C8 CAP., X7R, 0.1µF, 16V, 10%, 0603 MURATA, GRM188R71C104K

7 1 L1 IND, 2.2µH XFL4020 COILCRAFT, XFL4020-222MEC

8 1 R2 RES., CHIP, 18.2k, 1/10W, 1%, 0603 VISHAY, CRCW060318K2FKED

9 1 R3 RES., CHIP, 49.9k, 1/16W, 1%, 0603 VISHAY, CRCW060349K9FKED

10 2 R1, R4 RES., CHIP, 1M, 1/16W, 1%, 0603 VISHAY, CRCW06031M00FKED

11 1 R5 RES., CHIP, 243k, 1/16W, 1%, 0603 VISHAY, CRCW0603243KFKED

12 1 U1 IC, LT8620EMSE, MSE16 LINEAR TECH. CORP., LT8620EMSE#PBF

Additional Demo Board Circuit Components

1 1 C1 CAP., ALUM, 10µF, 100V SUN ELECT, 100CE10BS

2 2 C3, C10 CAP., X7S, 4.7µF, 100V, 10%, 1210 TDK, C3225X7S2A475K

3 1 C9 CAP., X7R, 1.0µF, 16V, 10%, 0805 AVX, 0805YC105KAT2A

4 2 C11, C12 CAP., X7R, 0.1µF, 100V, 10%, 0603 MURATA, GRM188R72A104K

5 1 C13 CAP., X5R, 0.1µF, 100V, 10%, 0402 MURATA, GRM155R62A104K

6 1 FB1 FERRITE BEAD 0805 TDK, MPZ2012S221A

7 1 L2 IND, 4.7µH IHLP2020BZ-01 VISHAY, IHLP2020BZ-ER4R7M01

8 0 R6 (OPT) RES., 0603

Hardware: For Demo Board Only

1 9 E1-E9 TESTPOINT, TURRET, 0.094" PBF MILL-MAX, 2501-2-00-80-00-00-07-0

2 1 JP1 3 PIN 0.079" SINGLE ROW HEADER SULLIN, NRPN031PAEN-RC

3 1 XJP1 SHUNT, 0.079" CENTER SAMTEC, 2SN-BK-G

4 4 MH1-MH4 STAND-OFF, NYLON 0.50" TALL KEYSTONE, 8833(SNAP ON)

dc1992af

DEMO MANUAL DC1992A

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

D D

C C

B B

A A

ALL CAPACITORS ARE 0603.

NOTES: UNLESS OTHERWISE SPECIFIED

1. ALL RESISTORS ARE 0603.

SUNCON

100CE10BS

(2MHz)

VOUT

OPT

243k

GND E2

GND

EN/UV

2.2uF

100V

1206

2.2uF

100V

1206

LT8620EMSE

VIN

EN/UV

SYNC

INTVCC

TR/SS

GND

FB 16

PG 15

BIAS 14

SW 11

SW 10

SW 9

BST 12

GND

C12

0.1uF

100V

C12

0.1uF

100V

JP1

GND

SYNC

JP1

GND

SYNC

1uF

0402

6.3V

1uF

0402

6.3V

SYNC

C11

0.1uF

100V

C11

0.1uF

100V

2.2uH

XFL4020-222MEC

2.2uH

XFL4020-222MEC

C13

0.1uF

0402

100V

C13

0.1uF

0402

100V

18.2k

FB1FB1

TR/SS

1uF

0805

16V

1uF

0805

16V

1Meg

0.1uF

4.7uH

10pF

47uF

10V

1210

47uF

10V

1210

4.7uF

100V

1210

4.7uF

100V

1210

E8 PG

10uF

100V

10uF

100V

49.9k

E4 GND

C10

4.7uF

100V

1210

C10

4.7uF

100V

1210

0.1uF

16V

0402

0.1uF

16V

0402

VOUT

5V / 2A

VOUT

5V / 2A

VIN

5.5V - 65V E1

VIN

5.5V - 65V

dc1992af

DEMO MANUAL DC1992A

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 0614 • 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

Mouser Electronics

Authorized Distributor

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

Analog Devices Inc.:

DC1992A

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