Analog Devices LINEAR DC2469A Guide de configuration rapide

dc2469af

DEMO MANUAL DC2469A

DESCRIPTION

LT8603

42V, Low IQ, Quad Output Triple Monolithic

Buck Converter with Boost Channel as SEPIC

Demonstration circuit 2469A features the LT

8603 with

triple monolithic buck regulators and the boost channel as

SEPIC. The demo circuit is designed for 8V, 5V, 3.3V, and

1.8V outputs from a nominal 12V input. The 4th channel is

set as a SEPIC converter and its output is regulated at 8V

over a wide input range. The two high voltage buck regula-

tors are powered from VOUT4. VOUT1 is regulated at 5V

with 1.5A maximum output load current, and VOUT2 is

at 3.3V with 2.5A maximum output load current. The low

voltage buck is powered from VOUT2 (3.3V), and the out-

put VOUT3 is regulated at 1.8V with 1.8A maximum load

current. Thanks to the SEPIC converter, all four outputs

can ride through a cold crank in automotive applications

while providing regulated output voltages.

All regulators are synchronized to an internal oscillator

that can be programmed with one resistor at RT pin.

Programmable frequency allows optimization between

efficiency and external component size. To avoid the audio

band, the DC2469A sets the switching frequency at 2MHz

for the three buck regulators, and the SEPIC converter is

at 400kHz. At all frequencies, a 180° phase shift is main-

tained between 1 and 2 channels, reducing the input peak

current and voltage ripple.

All registered trademarks and trademarks are the property of their respective owners.

PERFORMANCE SUMMARY

Many popular features such as soft-start, cycle-by-cycle

current limit, power good for each of the four channels

are packed in the 40-lead 6mm ×6mm QFN package to

simplify the complex design of quad-output power con-

verters. Each buck regulator can be independently dis-

abled using its own TRKSS or RUN pin. The SEPIC can be

disabled by pulling down both the FSEL4A and FSEL4B.

The EN/UVLO can be used to shut down the circuit to

reduce the input current to 1µA.

Table 1 summarizes the performance of the demo board at

room temperature. The demo circuit can be easily modi-

fied for various automotive, transportation and industry

applications. For applications that need 4th channel con-

figured as a boost converter, the DC2114A should be used.

The LT8603 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 DC2469A.

Design files for this circuit board are available at

http://www.linear.com/demo/DC2469A

Specifications are at TA= 25°C

Table 1.

PARAMETER CONDITIONS MIN TYP MAX UNITS

Operation Input Voltage Range 3 12 42 V

Minimum Start-Up, VINMIN 4.5 V

Standby Current When Switching IOUT1,2,3,4 = 0mA, VIN = 12V 40 µA

Channel 4 Output Voltage, VOUT4 IOUT4 = 1A 7.68 8 8.32 V

Channel 1 Output Voltage, VOUT1 IOUT1 = 1.5A 4.86 5 5.14 V

Channel 2 Output Voltage, VOUT2 IOUT2 = 2.5A 3.17 3.3 3.43 V

Channel 3 Output Voltage, VOUT3 IOUT3 = 1.8A 1.73 1.8 1.87 V

Maximum Output Current, IOUT1 VIN = 12V 1.5 A

Maximum Output Current, IOUT2 VIN = 12V, IOUT3 = 0A 2.5 A

dc2469af

DEMO MANUAL DC2469A

QUICK START PROCEDURE

Demonstration circuit 2469A is easy to set up to evalu-

ate the performance of the LT8603. Refer to Figure 1 for

proper equipment setup and follow these procedures.

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

board through VIN and GND terminals on the top layer.

Connect the loads to the terminals VOUT1 and GND,

VOUT2 and GND, VOUT3 and GND on the board. The

default positions of the headers are given in Table 2.

Table 2. Default Positions of the Headers

NAME POSITION

EN/UVLO JP4 ON

TRKSS1 JP1 ON

TRKSS2 JP2 ON

RUN3 JP3 RUN

2. Turn on the power at the input. Increase VIN to 4.5V.

Make sure that the input voltage is always within spec.

Refer to data sheet on the switching in high VIN condi-

tion and the Burst Mode

operation in light load. The

minimum start-up voltage for the SEPIC converter (and

the board) is 4.5V. Once it starts, the circuit runs with

input going down below 3V at light load.

3. Check for the proper switching frequency and output

voltage at channel 4. The output is set at 8V (±4%).

The SEPIC converter output current capability depends

on the input voltage. If the 4th output is not regulated,

temporarily disconnect the load, and disable the two

high voltage buck regulators (channels 1, 2) as well.

Check if the EN/UVLO is set in correct position. Check

if too much load is applied to VOUT4. SEPIC does not

have overcurrent or short-circuit protection capability.

NOTE:By default, the switching frequency of the SEPIC

converter is optimized with 400kHz with FSEL4A low

and FSEL4B high. The switching frequency can be

changed with RT, or different FSEL4A / FSEL4B set-

tings. An accompanying change of inductors might

be necessary to achieve desirable performance of the

converter.

4. Check for the proper output voltages of the buck regu-

lators. The output should be regulated at 5V (±4%),

3.3V (±4%), 1.8V (±4%) for the channels 1, 2 and

3, respectively. Do not overload the buck regulators

simultaneously at high line unless proper thermal cool-

ing method such as air flow or heat sink is applied.

If there is no output, temporarily disconnect the load

of the corresponding channels to make sure that the

PERFORMANCE SUMMARY

Table 1.

PARAMETER CONDITIONS MIN TYP MAX UNITS

Maximum Output Current, IOUT3 VIN = 12V, IOUT2 = 0A 1.8 A

Maximum Output Current, IOUT4 VIN = 12V, IOUT1,2,3 = 0A 1.5 A

Switching Frequency, Channel 1~3 VIN = 12V, IOUT1,2,3 = 1A 1.85 2 2.15 MHz

Switching Frequency, Channel 4 VIN = 6V, IOUT4 = 1A 370 400 430 kHz

Efficiency, Channel 4 VIN = 7V, IOUT4 = 2.5A 84 %

Efficiency, CH1, 5V VIN = 12V, IOUT1 = 1.5A 89 %

Efficiency, CH2, 3.3V VIN = 12V, IOUT2 = 2.5A 84 %

Efficiency, CH3, 1.8V PVIN3 = 3.3V, IOUT3 = 1.8A 83 %

Efficiency, Overall VIN = 14V, IOUT1,2,3 = 1A 75 %

dc2469af

DEMO MANUAL DC2469A

loads are not set too high, and the headers of EN/UVLO,

TRKSS1, TRKSS2, RUN3 are set in right positions.

5. Once the proper output voltage is established, adjust

the input voltage and load currents within the operating

range, and observe the output voltage regulation, tran-

sient, ripple voltage, efficiency and other parameters.

By default the circuit is set in low ripple Burst Mode

operation with SYNC grounded. Remove R11, and add

0Ω at R10, the circuit is set in pulse-skipping mode.

The circuit runs in full frequency with lower load cur-

rent in this mode. To synchronize to an external clock,

apply the external clock to the SYNC turret.

QUICK START PROCEDURE

6. When measuring the input or output voltage ripples,

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

oscilloscope probe. Measure the input or output volt-

age ripple by touching the probe tip directly across the

or V

OUT

capacitor terminals. See Figure 2 for proper

scope probe technique.

NOTE:Refer to the thermal derating curves in LT8603

data sheet for high input voltage and/or high ambient

temperature operations.

dc2469af

DEMO MANUAL DC2469A

Figure 1. Proper Measurement Equipment Setup

QUICK START PROCEDURE

dc2469af

DEMO MANUAL DC2469A

Figure 2. Proper Scope Probe Placement for Measuring Input or Output Ripple

Figure 3. Thermal Image Top View, IOUT1 = 1A, IOUT2 = 1A, IOUT3 = 1A, TA= 25°C, FSW = 2MHz

A) VIN = 6V B) VIN = 24V

QUICK START PROCEDURE

OR V

OUT

GND

dc2469af

DEMO MANUAL DC2469A

QUICK START PROCEDURE

= 2MHz

= 8V

LOAD CURRENT (A)

0.3

0.5

0.8

1.3

1.5

1.8

2.3

2.5

100

EFFICIENCY (%)

CH1, CH2 Efﬁciency

DC2469A F04a

= 400kHz

= 7V

Burst Mode OPERATION

PULSE-SKIPPING MODE

LOAD CURRENT (A)

0.3

0.5

0.8

1.3

1.5

1.8

2.3

2.5

EFFICIENCY (%)

Efﬁciency, V

OUT

= 8V

DC2469A F04b

Figure 4. Load Transient from 50mA to 450mA at VOUT4, VIN = 5V, FSW = 400kHz, Burst Mode Operation

Figure 5. SEPIC Maximum Output Current vs Input Voltage

RSENSE = 0.008

VIN (V)

4.4

4.8

5.2

5.6

6.4

6.8

7.2

7.6

IOUT (A)

Output Current

DC2469A F05

dc2469af

DEMO MANUAL DC2469A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 CVIN Cap, X5R 1µF 50V 10% 0603 Murata, GRM188R61H105KAALD

2 2 C26, C27 Cap, X7R 4.7µF 50V 10% 1206 Murata, GRM31CR71H475KA12L

3 2 CVIN1, CVIN2 Cap, X7R 4.7µF 16V 10% 0805 Murata, GRM21BR71C475KA73L

4 1 CVIN3 Cap, X5R 10µF 6.3V 20% 0603 Murata, GRM188R60J106ME47D

5 4 CVIN4, CVIN5, CVIN6, CVIN7 Cap, X5R 10µF 50V 10% 1206 Murata, GRM31CR61H106KA12L

6 1 C1 Cap, Alum 22µF 50V 10% Sun Elect Ind, 50CE22BSS

7 3 C2, C3, C32 Cap, X7R 0.1µF 50V 10% 0402 Murata, GRM155R71H104KE14J

8 2 C6, C9 Cap, X5R 47µF 16V 10% 1210 Murata, GRM32ER61C476KE15K

9 1 C7 Cap, Alum 47µF 16V 20% Sun Elect Ind, 16CE47BS

10 1 C8 Cap, X7R 0.1µF 50V 10% 0603 Murata, GRM188R71H104KA93D

11 2 C10, C17 Cap, X7R 0.1µF 16V 10% 0402 Murata, GRM155R71C104KA88D

12 2 C11, C15 Cap, X7R 47nF 25V 20% 0603 Murata, GRM188R71C473KA01D

13 2 C12, C22 Cap, X5R 47µF 10V 10% 1206 Murata, GRM31CR61A476KE15L

14 3 C13, C19, C23 Cap, X7R 2.2µF 10V 10% 0402 Murata, GRM155R61A225KE95D

15 1 C18 Cap, X5R 100µF 6.3V 20% 1206 Murata, GRM31CR60J107ME39K

16 2 C20, C21 Cap, X7R 4.7µF 10V 10% 0603 Murata, GRM188R61A475KE15D

17 1 C25 Cap, C0G 1500pF 25V 5% 0603 Murata, GRM1885C1E152JA01D

18 1 C29 Cap, C0G 2.2pF 50V ±0.25pF 0603 Murata, GRM1885C1H2R2CA01D

19 1 C30 Cap, C0G 4.7pF 50V ±0.25pF 0603 Murata, GRM1885C1H4R7CA01D

20 1 C31 Cap, C0G 22pF 50V 5% 0603 Murata, GRM1885C1H220JA01D

21 2 C34, C38 Cap, X7R 10µF 50V 10% 1210 Murata, GRM32ER71H106KA12L

22 1 D1 Schottky Rectifier, 60V, 5A, SOT1289 Nexperia, PMEG060V050EPD

23 2 D2, D3 Schottky Rectifier, 0.2A, SOD523 NXP, PMEG6002EB

24 1 FB1 BEAD, 4A 1206 Wurth Elektronik, 742792150

25 1 L1 Res, Jumper, Chip, 0Ω 0805 Vishay, CRCW08050000Z0EA

26 1 L2 Inductor, 3.3µH XEL4030 Coilcraft, XEL4030-332ME

27 1 L3 Inductor, 1.5µH XEL4030 Coilcraft, XEL4030-152ME

28 1 L4 Inductor, 1µH NPIM42P NIC Comp Corp, NPIM42P1R0MTRF

29 1 L5 Inductor, 1.5µH Wurth Elektronik, 7448700015

30 1 Q1 MOSFET-N Channel, PG-TSDSON-8 Infineon, BSZ067N06LS3 G

31 1 R1 RES, CHIP, 0.008, 1W, 1%, 0815 Susumu, RL3720WT-R008-F

32 4 R2, R3, R4, R5 Res, Chip 24.9k 0.1W 1% 0603 Vishay, CRCW060324K9FKEA

33 1 R6 Res, Chip 3.32M 0.1W 1% 0603 Vishay, CRCW06033M32FKEA

34 1 R7 Res, Chip 365k 0.1W 1% 0603 Vishay, CRCW0603365KFKEA

35 1 R8 Res, Chip 806k 0.1W 1% 0603 Vishay, CRCW0603806KFKEA

36 5 R9, R11, R13, R14, R19 Res, Chip 200k 0.1W 1% 0603 Vishay, CRCW0603200KFKEA

37 1 R12 Res, Chip 464k 0.1W 1% 0603 Vishay, CRCW0603464KFKEA

38 1 R15 Res, Chip 1M 0.1W 1% 0603 Vishay, CRCW06031M00FKEA

39 1 R16 Res, Chip 30.1k 0.1W 1% 0603 Vishay, CRCW060330K1FKEA

40 1 R17 Res, Chip 187k 0.1W 1% 0603 Vishay, CRCW0603187KFKEA

41 1 R18 Res, Chip 150k 0.1W 1% 0603 Vishay, CRCW0603150KFKEA

dc2469af

DEMO MANUAL DC2469A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

42 1 R23 Res, Chip 2.49M 0.1W 1% 0603 Vishay, CRCW06032M49FKEA

43 1 R21 Res, Chip 10k 0.1W 1% 0603 Vishay, CRCW060310K0FKEA

44 6 R24, R27, R32, R33, R36, R37 Res, Jumper, Chip, 0Ω 0603 Vishay, CRCW06030000Z0EA

45 1 R34 Res, Jumper, Chip, 0Ω 0805 Vishay, CRCW08050000Z0EA

46 1 U1 IC, Buck Regulator QFN (40) (UJ) Analog Device, LT8603EUJ

Additional Demo Board Circuit Components

1 0 C4, C5 Cap, 0402

2 0 C14, C16, C28, C36, C37, C41, C43 Cap, 0603

3 0 C33 Cap, 1206

4 0 Q2 NPN. MMBT3904, SOT-23

5 0 R10, R20, R25, R26, R29, R30, R31,

R35, R38, R39

Res, 0603

6 0 R28 Res, 1210

7 0 U2 IC, LTC6908CS6-1 TSOT-23-6 Analog Device, LTC6908CS6-1#PBF

Hardware: For Demo Board Only

1 20 E1 to E20 Turret, Testpoint Mill Max, 2501-2-00-80-00-00-07-0

2 5 JP1, JP2, JP3, JP4, JP5 Headers, 3 Pins 2mm Ctrs Wurth Elektronik, 62000311121

3 5 XJP1, XJP2, XJP3, XJP4, XJP5 Shunt, 2mm Ctrs Samtec, 2SN-BK-G

4 4 MH1 to MH4 STAND-OFF, NYLON 0.25" Tall (SNAP ON) Wurth Electronik, 702931000

dc2469af

DEMO MANUAL DC2469A

Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog

Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications

subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

SCHEMATIC DIAGRAM

B B

A A

NOTE: UNLESS OTHERWISE SPECIFIED.

1. All Resistors and Capacitors 0603.

See Demo Manual for details on VOUT2 and VOUT4

current capability.

(2MHz)

OPTIONAL CIRCUIT

INTVCC4

INTVCC

SYNC

VOUT1

INTVCCINTVCC

INTVCC

VOUT1

INTVCC4

PMEG6002EB

E13 VOUT2

3.3V / 1.5A

JP3

RUN

EXT

RUN3

OPT

0402

C20 4.7µF

10V 0603

PMEG6002EB

PG2

CVIN3

10µF

C18

100uF

6.3V

1206

R14

200k

OPT

0402

C16

(Opt)

R10

OPT

C38

R19

200k

PG4

R34

C22

47µF

10V

X5R

1206

FB1

742792150

E18

GND

22µF

50V

C32

0.1µF

50V

0402

OPT

MMBT3906

C30

4.7pF

C25

1500pF

C17

0.1µF

25V

0402

L5-2

1.5uH

7448700015

2 4

C36

OPT

E9 VOUT1

5V / 1.5A

47µF

16V

C28

(Opt)

47uF

16V

1210

JP4

OFF

EN/UVLO

R39

OPT

24.9k

C14

(Opt)

BSZ067N06LS3 G

R20

OPT

C26

4.7µF

50V

1206

R27

R33

R17

187k

R38

OPT

C27

4.7µF

50V

1206

GND

0805

C37

OPT

C15

47nF

X7R

R35

OPT

24.9k

R13

200k

E17

SYNC

C13

2.2µF

0402

10V

C23

2.2µF

0402

10V

C43

OPT

C12

47µF

10V

X5R

1206

R30

OPT

JP5

VOUT2

VOUT1

0.1µF

0402

R37

C10

0.1µF

25V

0402

C31

22pF

E12

TRKSS2

E15

RUN3

CVIN6

1.5µH

XEL4030-152ME

CVIN7

E14

GND

C11

47nF

X7R

R25

OPT

R32 0

E19

RST

365k

PG3

R24

OPT

LTC6908CS6-1

V+

OUT1 6

GND

2MOD 4

SET3

OUT2 5

24.9k

R23

2.49M

CVIN4 10µF

50V

X7R

1206

PMEG060V050EPD

E16 VOUT3

1.8V / 1.5A

C34

10µF

50V

1210

JP2

OFF

TRKSS2

3.32M

E10

TRKSS1 C29

2.2pF

R11

200k

CVIN1

4.7µF

0805

GND

C19

2.2µF

0402

10V

E11

GND

R16

30.1k

R21

10k

JP1

OFF

TRKSS1

L5-1

1.5uH

7448700015

C21 4.7µF

10V 0603

C41

OPT

PG1

R31 OPT

49.9K

CVIN5

C33

OPT

50V

1206

R28

OPT

1210

R26

OPT

CVIN

1uF 50V

E2 VOUT4

8V / 1.5A

200k

R36

CVIN2

4.7µF

0805

R15

LT8603EUJ

GND

SW3 36

BST1 4

FB1 26

PVIN1 37

SW1 3

GND

SW2 6

BST2 5

FB2 25

SYNC

FB3 27

GATE4 15

FB4 24

INTVCC

VIN

EN/UVLO

PG1

TRKSS1

TRKSS2

RUN3

ISN4 18

GND

BIAS

PVIN3 34

PG2

PG3

PG4

RST

ISP4 19

PVIN2 14

INTVCC4

GND

SW2 7

CPOR

POREN

FSEL4A

FSEL4B

0.1µF

0402

806k

E20

POREN

VEMI+

3V - 42V

R29

OPT

R12

464k

0.1uF

16V

1.0µH

NIC Comp. Corp.

NPIM42P1R0MTRF

47uF

16V

1210

R18

150k

R1 0.008

0815 1%

3.3µH

XEL4030-332ME

24.9k

VOUT3

VOUT4

PG1

PG2

PG3

PG4

VEMI

PG3

VIN

VOUT4

VOUT1

VOUT2

ISN4

ISN

ISN4

PG4

dc2469af

DEMO MANUAL DC2469A

LT 0118 • PRINTED IN USA

 ANALOG DEVICES, INC. 2018

ESD Caution

ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection

circuitry, damage may occur on devices subjected to high energy ESD. Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality.

Legal Terms and Conditions

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conditions set forth below (“Agreement”) unless you have purchased the Evaluation Board, in which case the Analog Devices Standard Terms and Conditions of Sale shall govern. Do not use the Evaluation

Board until you have read and agreed to the Agreement. Your use of the Evaluation Board shall signify your acceptance of the Agreement. This Agreement is made by and between you (“Customer”)

and Analog Devices, Inc. (“ADI”), with its principal place of business at One Technology Way, Norwood, MA 02062, USA. Subject to the terms and conditions of the Agreement, ADI hereby grants to

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