DC1818A - LINEAR TECHNOLOGY

dc1818af

DEMO MANUAL DC1818A

DESCRIPTION

LTM8001

36VIN, 5A µModule Regulator with

5-Output Configurable LDO Array

Demo circuit 1818A features the LTM8001 Module regula-

tor that includes a 5A switching regulator and an array of

five 1.1A low noise LDOs. DC1818A is configured so the

switching regulator provides an output that also powers

the LDOs. The LDOs in turn provide three outputs – one

from a single LDO and two outputs each formed by paral-

leling two LDOs together.

DC1818A supports changes to the LTM8001’s user adjust-

able features including the output voltage of the switching

regulator, output voltage of each of the five LDOs, switching

frequency, soft-start period and output current limit of the L, LT, LTC, LTM, Linear Technology, the Linear logo and Module are registered trademarks of

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

switching regulator simply by modifying the appropriate

resistors or capacitor. DC1818A also supports all current

sharing or independent operation options of the LDOs.

DC1818A includes a BNC connector for noise measure-

ment of the LDO for VOUT1. An optional capacitor at C14

further reduces output noise.

The LTM8001 data sheet must be read in conjunction with

this demo manual to properly use or modify DC1818A.

Design files for this circuit board are available at

http://www.linear.com/demo

Specifications are at TA = 25°C

BOARD PHOTO

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DEMO MANUAL DC1818A

QUICK START PROCEDURE

Demo circuit 1818A is an easy way to evaluate the perfor-

mance of the LTM8001. Refer to Figure 1 for the proper

measurement equipment setup and follow the procedure

below:

NOTE: Do not hot-plug the VIN terminal at high input

voltages. The absolute maximum voltage on VIN is 40V

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 LTM8001, an

aluminum electrolytic capacitor with higher ESR is placed

at the input terminals. This may protect against some, but

not all, input transients due to a hot-plugged power supply.

See Application Note 88 for more details.

1. Place JP1 for BIAS123 in the INTERNAL 3.4V position.

NOTE: DC1818A includes an LTM8020 regulator to provide

3.4V bias voltages to the LDOs. The 3.4V bias supply can

be disconnected using jumper JP1 to allow an external

bias supply.

2. Connect the power supply (with power off), loads, and

meters as shown in Figure 1.

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

and verify that VOUT0 is 1.8V and the output voltages for

VOUT1, VOUT2,3, and VOUT4,5 are 1.2V, 1.1V, and 0.9V

respectively.

NOTE: If VOUT0 is too low, temporarily disconnect the loads

to make sure that the loads are not set too high. If VOUT1,

VOUT2,3 or VOUT4,5 is too high, make sure the outputs are

loaded by at least the LDO minimum load current of 1mA,

2mA and 2mA respectively.

4. Once the proper output voltages are established, adjust

each load within its operating range and observe the

output voltage regulation, ripple voltage, efficiency and

other parameters.

PERFORMANCE SUMMARY

PARAMETER CONDITIONS MIN TYP MAX UNITS

Minimum Input Voltage, VIN 6V

Maximum Input Voltage, VIN 36 V

Regulator Output Voltage, VOUT0 IOUT0 ≤ 5A, IOUT1-5 = 0A, R9 = 19.6k 1.72 1.84 V

Maximum Regulator Output Current, IOUT0 ILIM = VREF, IOUT1-5 = 0A 5 A

LDO1 Output Voltage, VOUT1 1mA ≤ IOUT1 ≤ 700mA, R14 = 121k 1.16 1.25 V

LDO2,3 Output Voltage, VOUT2,3 VOUT2 = VOUT3, SET2 = SET3, 2mA ≤ IOUT2,3 ≤ 1.8A, R17 = 54.9k 1.04 1.13 V

LDO4,5 Output Voltage, VOUT4,5 VOUT4 = VOUT5, SET4 = SET5, 2mA ≤ IOUT4,5 ≤ 1.5A, R19 = 45.3k 0.86 0.94 V

VOUT0 Efficiency VIN = 12V, IOUT0 = 2.5A, IOUT1-5 = 0A 84 %

Switching Frequency R7 = 118k 350 kHz

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DEMO MANUAL DC1818A

Figure 1. Proper Measurement Equipment Setup

QUICK START PROCEDURE

dc1818af

DEMO MANUAL DC1818A

QUICK START PROCEDURE

Figure 2. VOUT1 Noise Spectrum (VOUT1 = 1.2V at 700mA, COUT1 = 22μF, CSET1 = 1nF, VIN = 12V,

VOUT0 = 1.8V Loaded to a Total Current of 5A)

Figure 3. VOUT1 Ripple (VOUT1 = 1.2V at 700mA, COUT1 = 22μF, CSET1 = 1nF, VIN = 12V,

VOUT0 = 1.8V Loaded to a Total Current of 5A, 100MHz BW)

FREQUENCY (MHz)

INTENSITY (dBm)

–40

–60

–80

–20

–100

–120 2.5 4.51.5 3.5

dc1881a F02

5.02.0 4.01.0 3.00.5

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DEMO MANUAL DC1818A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 COUT1 CAP., POSCAP, 470µF, 4V, D3L SANYO, 4TPE470ML

2 1 C1 Cap., X5R, 10µF, 50V, 20% 1210 TAIYO YUDEN, UMK325BJ106M

3 1 C5 Cap., X7R, 1000pF, 50V, 20% 0603 AVX, 06035C102MAT2A

4 1 C8 Cap., X5R, 100µF, 6.3V, 20%, 1210 TAIYO YUDEN, JMK325ABJ107MM-T

5 5 C9-C13 Cap., X5R, 2.2µF, 10V, 10%, 0805 TAIYO YUDEN, LMK212BJ225KG-T

6 1 R7 RES., CHIP, 118k, 1%, 0603 VISHAY, CRCW0603118KFKEA

7 1 R9 RES., CHIP, 19.6k, 1%, 0402 VISHAY, CRCW040219K6FKED

8 1 R14 RES., CHIP, 121k, 1%, 0402 VISHAY, CRCW0402121KFKED

9 1 R17 RES., CHIP, 54.9k, 1%, 0402 VISHAY, CRCW040254K9FKED

10 1 R19 RES., CHIP, 45.3k, 1%, 0402 VISHAY, CRCW040245K3FKED

11 1 U1 IC, LTM8001EY, BGA, 15mmX15mmX3.42mm LINEAR TECH. LTM8001EY

Additional Demo Board Circuit Components

1 0 CIN1 CAP., ALUM, 100µF, 50V SUN ELECT, 50CE100LX

2 0 C2, C3 Cap., X5R, 1µF, 10V , 20% 0603 TAIYO YUDEN, LMK107BJ105MA-T

3 0 C4 Cap., X5R, 10µF, 50V, 20% 1210 TAIYO YUDEN, UMK325BJ106M

4 0 C6 Cap., X7R, 100pF, 25V, 10%, 0603 AVX, 06033C101KAT2A

5 0 C14 Cap., 0603

6 0 C15 Cap., X5R, 2.2µF, 50V, 20%, 1206 TAIYO YUDEN, UMK316BJ225MD-T

7 0 C16 Cap., X5R, 10µF, 6.3V, 10%, 1206 TAIYO YUDEN, JMK316BJ106KL-T

8 0 R1 RES., CHIP, 121k, 1%, 0603 VISHAY, CRCW0603121KFKEA

9 0 R2, R10, R20 RES., CHIP, 0, 1206 VISHAY, CRCW12060000Z0EA

10 0 R3 RES., CHIP, 107k, 1%, 0603 VISHAY, CRCW0603107KFKEA

11 0 R4 RES., CHIP, 174k, 1%, 0603 VISHAY, CRCW0603174KFKEA

12 0 R5 RES., CHIP, 100k, 5%, 0603 VISHAY, CRCW0603100KJNEA

13 0 R6, R11, R13 RES., CHIP, 0603

14 0 R8, R12, R16, R22 RES., CHIP, 0, 0603 VISHAY, CRCW06030000Z0EA

15 0 R15, R18 RES., CHIP, 0402

16 0 R21 RES., CHIP, 287k, 1%, 0603 VISHAY, CRCW0603287KFKED

17 0 U2 IC, LTM8020EV, LGA, 6.25mmx6.25x2.32mm LINEAR TECH. LTM8020EV

Hardware: For Demo Board Only

1 21 E1-E21 TESTPOINT, TURRET, 0.095" MILL-MAX, 2501-2-00-80-00-00-07-0

2 1 JP1 Header, 3 Pins 2mm Ctrs. SAMTEC, TMM-103-02-L-S

3 1 JP1 SHUNT SAMTEC, 2SN-BK-G

4 1 J1 CONN, BNC, 5 PINS C0NNEX, 112404

5 4 MH1-MH4 STAND-OFF, NYLON 0.5" Tall KEYSTONE, 8833 (SNAP ON)

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DEMO MANUAL DC1818A

SCHEMATIC DIAGRAM

COMP

RUN

E16 VOUT3

E11 VOUT0

1.2V 700mA

1.1V 1.8A

R7 118k

1206

50V

100pF

0603

R9 19.6k

10uF

0402

174k

BIAS123

R14

121k

C4 10uF

1210

10V

0402

R17

54.9k

107k

10V

(OPT)

0.9V 1.5A

50V

E12 GND

VOUT1

10V

BIAS45

2. ALL CAPACI TORS ARE 0805

1210

C12 2.2uF

R15

(OPT)

0402

R19

45.3k

R10

10V

E19 VOUT5

E14 GND

350kHz

C14 (OPT)

R18

(OPT)

0603

LTM8001EY

VIN0 J1

VOUT0 A3

VIN0 J2

VIN0 K1

VIN0 K2

VIN0 L1

VIN0 L2

RUN

VIN45 A6

GND

B10 GND

GND

C10 GND

GND

D3 GND

D4 GND

D5 GND

D6 GND

D7 GND

D8 GND

GND

E3 GND

E4 GND

E5 GND

E6 GND

E7 GND

E8 GND

GND

F2 GND

F3 GND

F4 GND

F5 GND

F6 GND

F7 GND

F8 GND

GND

G4 GND

G5 GND

G6 GND

G7 GND

G8 GND

G9 GND

G10 GND

GND

H4 GND

H5 GND

H6 GND

H7 GND

H8 GND

H9 GND

H10

GND J9

GND J4

GND J5

GND J6

GND J7

GND J8

GND K5

GND K6

GND K10

GND K9

GND

D10 GND

E1 GND

GND

E10 GND

GND

F10 GND

GND

G3 GND

GND

H2 GND

GND J10

VIN0 J3

VIN0 K3

VIN0 L3

BIAS123

BIAS45

COMP

VREF

ILIM

SYNC

VOUT0 A4

VOUT0 A5

VOUT0 B5

VOUT0 B4

VOUT0 B3

VOUT0 C3

VOUT0 C4

VOUT0 C5

VIN45 A7

VIN45 B6

VIN45 B7

VIN45 C6

VIN45 C7

VOUT1 L10

VOUT1 L11

VOUT2 J11

VOUT2 K11

VOUT3 E11

VOUT3 F11

VOUT4 B11

VOUT4 C11

VOUT5 A10

VOUT5 A11

FBO

SET1 L9

SET2 H11

SET3 G11

SET4 D11

SET5 A9

10V

6V - 36V 1206

RUN

E17 GND

10V

C9 2.2uF

E20 GND

R13

(OPT)

R8 0

CIN1

100uF

C11 2.2uF

COUT1

470uF

ILIM

6.3V

50V

E21 GND

VOUT1

100uF

GND

C10 2.2uF

NOTE : UNLESS OTHERWISE SP ECIF IED

1. ALL RESISTORS ARE 0603 1%

0603

C13 2.2uF

1uF

R11

(OPT)

SYNC

10V

VIN

R5 100k 5%

E10 VIN45

E13 VOUT1

121k

E18 VOUT4

VIN

R12

1uF

GND

1.8V 1A

E15 VOUT2

R16

BIAS123

C5 1nF

0603

1210

0402

dc1818af

DEMO MANUAL DC1818A

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

VIN

BIAS123

RUN

LTM8020EV

GND

D3 GND

D4 GND

D5 GND

E2 GND

E3 GND

E4 GND

GND

D2 GND

VOUT A4

VOUT A5

VOUT B5

VOUT B4

ADJ

BIAS C3

VOUT C4

VOUT C5

SHDN

VIN

6.3V

BIAS123

INTERNAL 3.4V

EXTERNAL

C15

2.2uF

1206

50V

R20 0

C16

10uF

R22 0

1206

R21

287k

JP1

1206

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DEMO MANUAL DC1818A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

LT 0213 • 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

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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.

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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 applica-

tion engineer.

Mailing Address:

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