Linear Technology DC1596A Quick setup guide

dc1596afa

DEMO MANUAL DC1596A

DESCRIPTION

LTC3607EUD

Dual 600mA 15V Monolithic

Synchronous Step-Down Regulator

Demonstration circuit DC1596 is a dual output regulator

consisting of two constant-frequency step-down convert-

ers, based on the LT C

3607 monolithic dual channel

synchronous buck regulator. The DC1596 has an input

voltagerangeof4.5Vto15V,witheachregulatorcapableof

delivering up to 600mA of output current. The DC1596 can

operate in either Burst Mode

operation or pulse-skipping

mode. In shutdown, the DC1596 quiescent current is less

than 1µA. The DC1596 is a very efficient circuit attaining

up to 90%. The DC1596 uses the LTC3607’s16-lead QFN

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

package, which has an exposed pad on the bottom side

of the IC for better thermal performance. These features,

plus a set operating frequency range of 2.25MHz, make

the DC1596 demo board an ideal circuit for industrial or

distributed power applications.

Design files for this circuit board are available at

http://www.linear.com/demo

Specifications are at TA= 25°C

PARAMETER CONDITIONS VALUE

Minimum Input Voltage 4.5V

Maximum Input Voltage 15V

Run RUN Pin = GND

RUN Pin = VIN

Shutdown

Operating

Output Voltage VOUT1 Regulation VIN1 = 4.5V to 15V, IOUT1 = 0A to 600mA 1.2V ±4% (1.152V-1.148V)

1.5V ±4% (1.44V-1.56V)

1.8V ±4% (1.728V-1.872V)

Typical Output Ripple VOUT1 VIN1 = 12V, IOUT1 = 600mA (20MHz BW) <20mVP-P

Output Voltage VOUT2 Regulation VIN2 = 4.5V to 15V, IOUT2 = 0A to 600mA 2.5V ±4% (2.425V-2.6V)

3.3V ±4% (3.168V-3.432V)

5V ±4% (4.8V-5.2V)

Typical Output Ripple VOUT2 VIN2 = 12V, IOUT2 = 600mA (20MHz BW) <20mVP-P

Mode Setting Mode Pin Floating

Mode Pin Grounded

Burst Mode Operation

Pulse-Skipping

Burst Mode Operation Output Current Thresholds Channel 1: PVIN1 = 12V, VOUT1 = 1.8V

Channel 2: PVIN2 = 12V, VOUT2 = 3.3V

IOUT1 < 480mA

IOUT2 < 360mA

Pulse-Skipping Operation Output Current

Thresholds

Channel 1: PVIN1 = 12V, VOUT1 = 1.8V

Channel 2: PVIN2 = 12V, VOUT2 = 3.3V

IOUT1 < 330mA

IOUT2 < 240mA

Switching Frequency 2.25MHz ±20%

dc1596afa

DEMO MANUAL DC1596A

QUICK START PROCEDURE

The DC1596 is easy to set up to evaluate the performance

of the LTC3607. For a proper measurement equipment

configuration, set up the circuit according to the diagram

in Figure 1.

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 the proper scope probe

technique in Figure 2.

Please follow the procedure outlined below for proper

operation.

1. Connect the input power supply tothe PVIN1/PVIN2 and

GND terminals (VIN1 and VIN2 are separate nodes but

are connected). Connect the loads between the VOUT

and GND terminals. Refer to Figure 1 for the proper

measurement equipment setup.

Before proceeding to operation, insert jumper shunts

XJP1 and XJP2 into the OFF positions of headers JP1

and JP2, shunt XJP3 into the pulse-skip position of

MODE header JP3, and shunt XJP4 into the VOUT1

voltage options of choice of header JP4: 1.2V, 1.5V, or

1.8V, and shunt XJP5 into the VOUT2 voltage options

of choice of header JP5: 2.5V, 3.3V, or 5V.

2. Apply 5.5V at PVINs 1, 2. Measure both VOUTs; they

should read 0V. If desired, one can measure the shut-

down supply current at this point. The supply current

will be less than 1µA in shutdown.

3. Turn on VOUT1 and VOUT2 by shifting shunts XJP1

and XJP2 from the OFF positions to the ON positions.

Both output voltages should be within a tolerance of

±2%.

4. Vary the input voltages from 5.8V(the minimum VIN is

dependent on VOUT) to 15V, and the load currents from

0A to 600mA. Both output voltages should be within

±4% tolerance.

5. Set the load current of both outputs to 600mA and the

input voltages to 12V, and then measure each output

ripple voltage (refer to Figure 2 for proper measure-

ment technique); they should each measure less than

20mVAC. Also, observe the voltage waveform at either

switch node (Pin 5 for reg.1 and Pin 8 for reg.2) of each

regulator. The switching frequencies should be about

2.25MHz ±20% (T= 555ns and 370ns). Both switch

node waveforms should be rectangular in shape, and

180° out-of-phase with each other.

6. To operate the ckt.s in Burst Mode operation, change

the shunt position of header JP3 to BURST MODE.

7. Regulators 1 (PVIN1) and 2 (PVIN2) are completely

separated from each other; thus, they can be powered

from different individual input supplies (if R11 is re-

moved), as can the signal input supply, SVIN. However,

SVIN must powered for either regulator to function

(SVIN is connected to PVIN1 through a filter on the

demo board.).

8. When finished, insert shunts XJP1 and XJP2 to the OFF

position(s) and disconnect the power.

Warning: If the power for the demo board is carried in

long leads, the input voltage at the part could “ring”, which

could affect the operation of the circuit or even exceed the

maximum voltage rating of the IC. To eliminate the ring-

ing, a small tantalum capacitor (for instance, AVXpart #

TPSY226M035R0200) is inserted on the pads between

the input power and return terminals on the bottom of the

demo board. The (greater) ESR of the tantalum capacitor

will dampen the (possible) ringing voltage caused by the

long input leads. On a normal, typical PCB, with short

traces, this capacitor is not needed.

dc1596afa

DEMO MANUAL DC1596A

QUICK START PROCEDURE

VIN GND

Figure 1. Proper Measurement Equipment Setup

Figure 2. Measuring Input or Output Ripple

dc1596afa

DEMO MANUAL DC1596A

QUICK START PROCEDURE

VSW1

10V/DIV

VSW2

10V/DIV

200ns/DIV

PVIN1,2 = 12V

VOUT1 = 1.8V AT IOUT1 = 600mA

VOUT2 = 3.3V AT IOUT2 = 600mA

PULSE-SKIPPING MODE

DC1596A F03

VOUT1

20mV/DIV

AC VOLTAGE

VOUT2

20mV/DIV

AC VOLTAGE

Figure 3. Switch Operation Figure 4. Load Step Response

Figure 6. Load Step ResponseFigure 5. Load Step Response

20µs/DIV

VIN = 12V

VOUT1 = 1.2V

400mA LOAD STEP (200mA TO 600mA)

PULSE-SKIPPING MODE, fSW = 2.25MHz

DC1596A F04

VOUT

100mV/DIV

AC-COUPLED

IOUT

200mA/DIV

20µs/DIV

VIN = 12V

VOUT1 = 1.5V

400mA LOAD STEP (200mA TO 600mA)

PULSE-SKIPPING MODE, fSW = 2.25MHz

DC1596A F05

VOUT

100mV/DIV

AC-COUPLED

IOUT

200mA/DIV

20µs/DIV

VIN = 12V

VOUT1 = 1.8V

400mA LOAD STEP (200mA TO 600mA)

PULSE-SKIPPING MODE, fSW = 2.25MHz

DC1596A F06

VOUT

100mV/DIV

AC-COUPLED

IOUT

200mA/DIV

dc1596afa

DEMO MANUAL DC1596A

QUICK START PROCEDURE

Figure 7. Load Step Response Figure 8. Load Step Response

Figure 9. Load Step Response

LOAD CURRENT (A)

0000.1

EFFICIENCY (%)

DC1596A F10

20 000.1 00.1 0.1

100

VIN = 5V, VO1 = 1.8V

VIN = 12V, VO1 = 1.8V

VIN = 5V, VO2 = 3.3V

VIN = 12V, VO2 = 3.3V

L1: 2.2µH 1616BZ VISHAY

L2: 4.7µH 1616BZ VISHAY

Burst Mode OPERATION

fSW = 2.25MHz

Figure 10. Efficiency

20µs/DIV

VIN = 12V

VOUT2 = 2.5V

400mA LOAD STEP (200mA TO 600mA)

PULSE-SKIPPING MODE, fSW = 2.25MHz

DC1596A F07

VOUT

100mV/DIV

AC-COUPLED

IOUT

200mA/DIV

20µs/DIV

VIN = 12V

VOUT2 = 3.3V

400mA LOAD STEP (200mA TO 600mA)

PULSE-SKIPPING MODE, fSW = 2.25MHz

DC1596A F08

VOUT

100mV/DIV

AC-COUPLED

IOUT

200mA/DIV

20µs/DIV

VIN = 12V

VOUT2 = 5V

400mA LOAD STEP (200mA TO 600mA)

PULSE-SKIPPING MODE, fSW = 2.25MHz

DC1596A F09

VOUT

100mV/DIV

AC-COUPLED

IOUT

200mA/DIV

dc1596afa

DEMO MANUAL DC1596A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 2 CFFW1, CFFW2 CAP., NPO, 22pF, 25V, 5%, 0402 AVX, 04025A220JAT2A

2 2 CIN1BYP, CIN2BYP CAP., X7R, 0.1µF, 16V, 10%, 0603 AVX, 0603YC104KAT2A

3 2 COUT1, COUT2 CAP., X5R, 10µF, 6.3V, 10%, 0805 AVX, 08056D106KAT2A

4 2 CIN1, CIN2 CAP., X5R, 10µF, 16V, 10%, 1206 AVX, 1206YD106KAT2A

5 1 L1 Inductor, 2.2µH VISHAY, IHLP1616BZER2R2M11

6 1 L2 Inductor, 4.7µH VISHAY, IHLP1616BZER4R7M11

7 1 R1 RES., CHIP, 210k, 1%, 0402 VISHAY, CRCW0402210KFKED

8 1 R2 RES., CHIP, 887k, 1%, 0402 VISHAY, CRCW0402887KFKED

9 1 R6 RES., CHIP, 196k, 1%, 0402 VISHAY, CRCW0402196KFKED

10 1 R7 RES., CHIP, 105k, 1%, 0402 VISHAY, CRCW0402105KFKED

11 1 U1 IC., LTC3607EUD, 16-PIN QFN 3X3 LINEAR TECH., LTC3607EUD

Additional Demo Board Circuit Components

1 3 COUT3, COUT4, CF CAP., X7R, 0.1µF, 16V, 10%, 0603 AVX, 0603YC104KAT2A

2 2 CIN3, CIN4 CAP., TANT, 22µF, 35V, 20%, CASE Y AVX, TPSY226M035R0200

3 0 COUT5, COUT6 (OPT.) CAP., X5R, 47µF, 6.3V, 10%, 1210 AVX, 12106D476KAQ2A

4 0 CIN5, CIN6 (OPT.) CAP., X5R, 47µF, 20V, 10%, 1812

5 1 RF RES., CHIP, 100Ω, 1/16W, 5%, 0402 VISHAY, CRCW0402100RJNED

6 1 R3 RES., CHIP, 210k, 1%, 0402 VISHAY, CRCW0402210KFKED

7 1 R4 RES., CHIP, 280k, 1%, 0402 VISHAY, CRCW0402280KFKED

8 1 R5 RES., CHIP, 140k, 1%, 0402 VISHAY, CRCW0402140KFKED

9 1 R8 RES., CHIP, 121k, 1%, 0402 VISHAY, CRCW0402105KFKED

10 0 R9, R10 (OPT.) RES., 0402

11 1 R11 RES., CHIP, 0Ω, 1%, 0805 VISHAY, CRCW08050000Z0ED

12 2 RSD1, RSD2 RES., CHIP, 5.1M, 5%, 0402 VISHAY, CRCW04025M10JNED

13 2 RPG1, RPG2 RES., CHIP, 100k, 1%, 0402 VISHAY, CRCW0402100KFKED

Hardware

1 12 E1-E12 Testpoint, TURRET, 0.094" MILL-MAX-2501-2-00-80-00-00-07-0

2 2 JP1,JP2 0.079 SINGLE ROW HEADER, 3-PIN SAMTEC, TMM103-02-L-S

3 2 JP4,JP5 0.079, 2X4 HEADER SAMTEC, TMM104-02-L-D

4 1 JP3 0.079, 2X3 HEADER SAMTEC, TMM103-02-L-D

5 5 JP1-JP5 SHUNT, FOR JP1-JP5 SAMTEC, 2SN-BK-G

dc1596afa

DEMO MANUAL DC1596A

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

4 4

3 3

2 2

1 1

RUN2

OFF

RUN1

OFF

600mA 600mA

4.5V - 15V

1.2V

VFB1

1.5V

1.8V

2.5V

3.3V

VFB2

USER SELECT

4.5V - 15V

PULSE-SKIP

EXT SYNC MODE/SYNC

BURST MODE

DUAL 600mA MONOLITHIC, SYNCHRONOUS STEP-DOWN REGULATOR

[*] CIN3 AND CIN4 ARE INSERTED ON DC1596A TO DAMPEN THE (POSSIBLE)

RINGING VOLTAGE DUETO THE USE OF LONG INPUT LEADS. ON A NORMAL,

TYPICAL PCB, WITH SHORT TRACES, CIN3 AND CIN4 ARE NOT NEEDED.

TOM G.PRODUCTION2 3-15-13

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

Thursday, May 16, 2013

N/A

LTC3607EUD

DEMO CIRCUIT 1596A

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

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.

SCALE = NONE

www.linear.com

E11

GND

196k

VOUT1

RPG1

100k

100

GND

CIN1BYP

0.1uF

16V

SYNC

E12

GND

CFFW1

22pF

COUT2

10uF

6.3V

CFFW2

22pF

+CIN3

22uF

35V

RPG2

100k

RSD1

5.1M

JP1

PVIN2

JP5

1 2

3 4

5 6

PGOOD1

140k

COUT1

10uF

6.3V

887k

JP4

1 2

3 4

5 6

280k

E10

GND

JP2

R10

OPT

4.7uH

IHLP-1616BZER4R7M11

Vishay

JP3

1 2

3 4

5 6

210k

VOUT2

CIN1

10uF

16V

COUT3

0.1uF

16V

+CIN5

47uF

20V

OPT

CIN2

10uF

16V

105k

GND

+CIN4

22uF

35V

CIN2BYP

0.1uF

16V

RSD2

5.1M

COUT5

47uF

6.3V

OPT

PGOOD2

COUT6

47uF

6.3V

OPT

2.2uH

IHLP-1616BZER2R2M11

Vishay

R11

0 Ohm

0805

PVIN1

COUT4

0.1uF

16V

0.1uF

210k

LTC3607EUD

15 16

PGND2

MODE/SYNC

RUN2

SGND

PGOOD1

VFB2

SW2SW1

SVIN

PGOOD2

PVIN1

PVIN2

SGND

PGND1

VFB1 RUN1

GND

121k

+CIN6

47uF

20V

OPT

dc1596afa

DEMO MANUAL DC1596A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

 LINEAR TECHNOLOGY CORPORATION 2013

LT 0114 REV A • 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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