Linear Technology DC2169A Kurzanleitung zur Einrichtung

dc2169af

DEMO MANUAL DC2169A

Description

LT8616

Dual 42V Synchronous Monolithic Step-Down

Regulator with 6.5µA Quiescent Current

Demonstrationcircuit2169Ais adualmonolithicstep-down

DC/DC switching regulator featuring the LT

8616. The

LT8616 is a high efficiency, high speed, dual synchronous

monolithic step-down switching regulator that consumes

only6.5μAofquiescentcurrent with both channelsenabled.

The demo circuit is designed for 5V, 1.5A and 3.3V, 2.5A

outputs. Both channels contain all switches and neces-

sary circuitry to minimize the external components and

solution size. Fast minimum ON time of 35ns enables high

VIN to low VOUT conversion at high switching frequency.

Independent input voltage, feedback, soft-start and power

good pins for each channel simplify complex power supply

tracking/sequencing requirements.

The inputs of the two channels are connected on the demo

board by default. They can also be separated by removing

the 0Ω resistor (R13) from the board. Each output can

be independently disabled using its own EN/UV pin, while

VIN1 must be connected to 3.4V or above even if only

channel 2 is in use. The demo board has an EMI filter

installed between VIN2 and VEMI. To use the EMI filter, the

inputs should be tied to VEMI.

The switching frequency of both channels can be pro-

grammed either via an oscillator resistor or a common

external clock up to 3MHz.The SYNC pin on the demo

board is grounded by default for Burst Mode

operation.

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

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

owners.

performance summary

To synchronize to an external clock, move JP1 to SYNC/

MODE and apply the external clock to the SYNC/MODE

turret. The RTresistor (R5) should be chosen to set the

LT8616 internal switching frequency at least 20% below

the lowest synchronization input.

Low ripple Burst Mode operation increases the efficiency

at the light load while keeping the output ripple low.

Figure 1 and Figure 2 show the demo board efficiency for

each channel at 12V input voltage in Burst Mode opera-

tion. Figure 3 shows the temperature rising on DC2169A

demo board with different input voltages under full load

conditions on both channels.

The LT8616 data sheet gives a complete description of the

part, operation and application information. The data sheet

must be read in conjunction with this demo manual for

DC2169A. The LT8616 is assembled in a 28-lead plastic

TSSOP package. Proper board layout is essential for both

low EMI operation and maximum thermal performance.

See the data sheet sections for details.

Design files for this circuit board are available at

http://www.linear.com/demo/DC2169A

Specifications are at TA= 25°C

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

VIN1 Channel 1 Input Supply Range 5.8 42 V

VIN2 Channel 2 Input Supply Range 4.1 42 V

VOUT1 Channel 1 Output Voltage 4.88 5.02 5.15 V

VOUT2 Channel 2 Output Voltage 3.21 3.29 3.37 V

fSW Switching Frequency RT= 14.7kΩ 1.85 2.05 2.25 MHz

IOUT1 Channel 1 Max Output Current 1.5 A

IOUT2 Channel 2 Max Output Current 2.5 A

EFE Efficiency at DC VIN1 = VIN2 = 12V, IOUT1 = 1.5A, IOUT2 = 2.5A 85.1 %

dc2169af

DEMO MANUAL DC2169A

performance summary

Figure 1. LT8616 Channel 1 Efficiency vs Load Current

LOAD CURRENT (A)

EFFICIENCY (%)

100

0.6

DC2169A F01

1.50.30 0.9 1.2

fSW = 2MHz

VIN1 = 12V

VOUT1 = 5V

LOAD CURRENT (A)

EFFICIENCY (%)

100

DC2169A F02

2.50.50 1.5 2

fSW = 2MHz

VIN2 = 12V

VOUT2 = 3.3V

INPUT VOLTAGE (V)

TEMPERATURE RISING (°C)

100

DC2169A F03

40168 32

fSW = 2.05MHz

VOUT1 = 5V, IOUT1 = 1.5A

Figure 2. LT8616 Channel 2 Efficiency vs Load Current

Figure 3. LT8616 Temperature Rising vs Input Voltage

dc2169af

DEMO MANUAL DC2169A

DC2169A is easy to set up to evaluate the performance

of the LT8616. Refer to Figure 4 for proper measurement

equipment setup and follow the procedure below:

NOTE: When measuring the input or output voltage ripple,

care must be taken to avoid a long ground lead on the

oscilloscope probe. Measure the input or output voltage

ripple by touching the probe tip directly across the VIN

or VOUT and GND terminals. See Figure 5 for the proper

scope technique.

1. Place JP1 on the Burst Mode position.

2. With power off, connect the input power supply to VEMI

and GND. Make sure that the input voltage does not

exceed 42V.

3. With power off, connect loads from VOUT1 to GND, and

VOUT2 to GND.

4. Turn on the power at the input.

5. Check for the proper output voltages (5V and 3.3V).

NOTE: If there is no output, temporarily disconnect the

load to make sure that the load is not set too high or

is shorted.

6. Once the proper output voltages are established, adjust

the load within the operating ranges and observe the

output voltage regulation, ripple voltage, efficiency and

other parameters.

7. An external clock can be added to the SYNC terminal

when SYNC function is used (JP1 on the SYNC/MODE

position). Please make sure that the SYNC frequency is

at least 20% higher than the set switching frequency.

See the data sheet section Synchronization.

Quick start proceDure

OUT

GND

Figure 4. Proper Measurement Equipment Setup

Figure 5. Measuring Input or Output Ripple

dc2169af

DEMO MANUAL DC2169A

parts List

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 2 C2, C3 CAP., X7R, 0.1µF, 10V, 10% 0402 SAMSUNG, CL05B104KP5NNNC

2 1 C4 CAP., X7R, 22µF, 10V, 10% 1210 MURATA, GRM32ER71A226KE20L

3 1 C5 CAP., X7R, 47µF, 10V, 10% 1210 MURATA, GRM32ER71A476KE15L

4 2 C6, C7 CAP., X7R, 0.01µF, 10V, 10% 0603 AVX, 0603ZC103KAT2A

5 2 C8, C9 CAP., C0G, 4.7pF, 50V, ±0.25pF 0603 AVX, 06035A4R7CAT2A

6 2 C10, C11 CAP., X7R, 2.2µF, 50V, 10% 1206 MURATA, GRM31CR71H225KA88L

7 5 C12, C17, C19, C27, C28 CAP., X7R, 1µF, 10V, 10% 0603 AVX, 0603ZC105KAT2A

8 4 C13, C14, C15, C16 CAP., X7R, 0.1µF, 50V, 10% 0402 TDK, C1005X7R1H104K050BB

9 1 L1 IND., 3.3µH, XAL4030 COILCRAFT, XAL4030-332ME

10 1 L2 IND., 2.2µH, XFL4020 COILCRAFT, XFL4020-222ME

11 6 R1, R3, R6, R8, R10, R11 RES., CHIP, 1M, 0.1W, 1%, 0603 VISHAY, CRCW06031M00FKEA

12 1 R2 RES., CHIP, 187k, 0.1W, 1%, 0603 VISHAY, CRCW0603187KFKEA

13 1 R4 RES., CHIP, 316k, 0.1W, 1%, 0603 VISHAY, CRCW0603316KFKEA

14 1 R5 RES., CHIP, 14.7k, 0.1W, 1%, 0603 VISHAY, CRCW060314K7FKEA

15 2 R7, R13 RES., CHIP, 0Ω, 0.1W, 0603 VISHAY, CRCW06030000Z0EA

16 1 U1 IC., LT8616EFE TSSOP-28/EB LINEAR TECH., LT8616EFE#PBF

Additional Demo Board Circuit Components

1 2 C1, C18 CAP., ALUM., 22µF, 63V, SUN ELECTRONIC INDUSTRIES CORP., 63CE22BS

21 L3 CHIP BEAD, 30Ω, MPZ2012 TDK, MPZ2012S300AT

3 1 L4 IND., 0.22µH, IHLP1212AB VISHAY, IHLP1212ABERR22M11

4 1 C23 CAP., X7R, 4.7µF, 50V, 10% 1206 SAMSUNG, CL31B475KBHNNNE

5 1 C24 CAP., X7R, 10µF, 50V, 10% 1210 MURATA, GRM32ER71H106KA12L

6 2 C25, C26 CAP., X7R, 0.1µF, 50V, 10% 0402 TDK, C1005X7R1H104K050BB

7 0 R9, R12 (OPT) RES., CHIP, 0603

Hardware: For Demo Board Only

1 16 E1-E16 TESTPOINT, TURRET, .094" PBF MILL-MAX, 2501-2-00-80-00-00-07-0

2 1 JP1 4 PIN 0.079 SINGLE ROW HEADER SULLINS, NRPN041PAEN-RC

3 1 XJP1 SHUNT, .079" CENTER SAMTEC, 2SN-BK-G

dc2169af

DEMO MANUAL DC2169A

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

1. ALL RESISTORS ARE IN 0603

ALL CAPACITORS ARE IN 0603

NOTE: UNLESS OTHERWISE SPECIFIED

2MHz

63CE22BS 63CE22BS

VIN1 VIN2

SYNC

VOUT1

VIN2

VOUT2

VOUT1

VOUT2

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

TECHNOLOGY Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

CUSTOMER NOTICE

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

www.linear.com

DEMO CIRCUIT 2169A

Monday, January 19, 2015 11

DUAL 42V SYNCHRONOUS MONOLITHIC

N/A

LT8616EFE

STEP-DOWN REGULATOR WITH 6.5µA QUIESCENT CURRENT

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

TECHNOLOGY Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

CUSTOMER NOTICE

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

www.linear.com

DEMO CIRCUIT 2169A

Monday, January 19, 2015 11

DUAL 42V SYNCHRONOUS MONOLITHIC

N/A

LT8616EFE

STEP-DOWN REGULATOR WITH 6.5µA QUIESCENT CURRENT

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

TECHNOLOGY Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

CUSTOMER NOTICE

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

www.linear.com

DEMO CIRCUIT 2169A

Monday, January 19, 2015 11

DUAL 42V SYNCHRONOUS MONOLITHIC

N/A

LT8616EFE

STEP-DOWN REGULATOR WITH 6.5µA QUIESCENT CURRENT

2.2uH

XFL4020-222ME

C26

0.1uF

0402

50V

SYNC/MODE

C24

10uF

50V

1210

GND

4.7pF

GND

JP1

PULSE SKIPPING

BURST MODE

SYNC/MODE

4 Pins 2mm Ctrs.

E6 GND

C23

4.7uF

50V

1206

187k

E10

VIN2

4.1V - 42V

C19

1uF

C18

22uF

63V

C11

2.2uF

50V

1206

22uF

10V

1210

C16

0.1uF

50V

0402

E11 GND

C14

0.1uF

50V

0402

C27

1uF

VIN1

5.8V - 42V

PAD150-094

E12 PG2

0.1uF

10V

0402

VOUT2

3.3V / 2.5A

C17

1uF

R10

0.01uF

30 ohm

MPZ2012S300AT

SS2/TR2

LT8616EFE

FB2 26

BOOST2 6

PG1 11

FB1

SW2 3

PG2 2

VIN1 19

TR/SS1

TR/SS2

INTVCC

SW1

GND

SYNC/MODE

BOOST1

VIN2 24

EN/UV1

16 ENUV2 1

BIAS 22

NC 18

NC 23

NC 20

NC 25

FB2 27

SW2 4

SW2 5

FB1

SW1

VOUT1

5V / 1.5A

OPT

C28

1uF

C3 0.1uF

10V0402

C12

1uF

C15

0.1uF

50V

0402

316K

SS1/TR1

R1 1M

3.3uH

XAL4030-332ME

14.7k

C13

0.1uF

50V

0402

0.22uH

IHLP1212ABERR22M11

E15

EN1

22uF

63V

E16

VEMI

E14 PG1

C10

2.2uF

50V

1206

0.01uF

47uF

10V

1210

R13 0

R7 0

R11

E13 EN2

C9 4.7pF

R12

OPT

C25

0.1uF

0402

50V

dc2169af

DEMO MANUAL DC2169A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

 LINEAR TECHNOLOGY CORPORATION 2015

LT 0515 • 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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