1

DEMO MANUAL DC2860A

Rev. 0

DESCRIPTION

LTM8051EY40V, 1.2A Quad Step-Down Silent Switcher

μModule Regulator

Demonstration circuit 2860A is a quad step-down DC/DC switching converter featuring the LTM®8051 silent switcher μModule® regulator. The demo board is designed to deliver quad 5V/1.2A, 3.3V/1.2A, 2.5V/1.2A and 1.8V/1.2A outputs from a 7V to 40V input. The Silent Switcher® architecture minimizes EMI while achiev-ing high efficiency at frequencies up to 3MHz. The modes of operation (Burst Mode® operation or discontinuous mode/SYNC) are jumper selectable. Burst Mode operation improves efficiency at light loads.

The LTM8051 is a fixed frequency PWM regulator with current mode control scheme. The switching frequency of channel 1 and channel 4 is set by an appropriate resis-tor (R11) from the RT14 pin to ground. The switching frequency of channel 2 and channel 3 is set by another

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

PERFORMANCE SUMMARY

appropriate resistor (R23) from the RT23 pin to ground. The RUN14 pin (RUN14 terminal) can be used to set the LTM8051 channel 1 and channel 4 in micro power shut-down mode, while the RUN23 pin (RUN23 terminal) can be used to set the channel 2 and channel 3 in shutdown mode. Output tracking and soft start pins (TRSS1/TRSS2/TRSS3/TRSS4) allow user control of output voltage ramp rate during startup. The power good output of each chan-nel (PG1/PG2/PG3/PG4) will be low when that channel’s output voltage is outside of the ±7.5% regulation window.

The LTM8051 data sheet gives a complete description of the operation and application information. The data sheet must be read in conjunction with this demo manual.

Design files for this circuit board are available.

Specifications are at TA = 25°C

PARAMETER CONDITIONS MIN TYP MAX UNITS

Input Voltage Range 7 40 V

Output Voltage, VOUT1 VIN = 7V to 40V, IOUT1 = 0A to 1.2A 5 ±2% V

Output Voltage, VOUT2 VIN = 7V to 40V, IOUT2 = 0A to 1.2A 3.3 ±2% V

Output Voltage, VOUT3 VIN = 7V to 40V, IOUT3 = 0A to 1.2A 2.5 ±2% V

Output Voltage, VOUT4 VIN = 7V to 40V, IOUT4 = 0A to 1.2A 1.8 ±2% V

Maximum Output Current, IOUT1 VIN = 7V to 40V, VOUT1 = 5V 1.2 A

Maximum Output Current, IOUT2 VIN = 7V to 40V, VOUT2 = 3.3V 1.2 A

Maximum Output Current, IOUT3 VIN = 7V to 40V, VOUT3 = 2.5V 1.2 A

Maximum Output Current, IOUT4 VIN = 7V to 40V, VOUT4 = 1.8V 1.2 A

Typical Efficiency VIN = 12V, with 1.2A at Each Output, Burst Mode Operation 87.5 %

2

DEMO MANUAL DC2860A

Rev. 0

QUICK START PROCEDUREDemonstration circuit 2860A is easy to set up to evaluate the performance of the LTM8051. Refer to Figure 1 for the proper measurement equipment setup and follow the procedure below:

1. With power off, connect the input power supply to VIN (7V to 40V) and GND (input return).

2. Connect the 5V output load between VOUT1 and GND (Initial load: no load); connect the 3.3V output load between VOUT2 and GND (Initial load: no load); connect the 2.5V output load between VOUT3 and GND (Initial load: no load); and connect the 1.8V output load between VOUT4 and GND (Initial load: no load).

3. Connect the DVMs to the input and outputs.

4. Turn on the input power supply and check for the proper output voltages. VOUT1 should be 5V ±2%; VOUT2 should be 3.3V ±2%; VOUT3 should be 2.5V ±2%; VOUT4 should be 1.8V ±2%.

5. Once the proper output voltages are established, adjust the loads within the operating range and observe the output voltage regulation, efficiency and other param-eters.

NOTE: When measuring the output or input voltage rip-ple, do not use the long ground lead on the oscilloscope probe. See Figure 2 for the proper scope probe technique. Short, stiff leads need to be soldered to the (+) and (–) terminals of an output capacitor. The probe’s ground ring needs to touch the (–) lead and the probe tip needs to touch the (+) lead.

BOARD PHOTO

3

DEMO MANUAL DC2860A

Rev. 0

QUICK START PROCEDURE

Figure 1. Proper Measurement Equipment Setup

Figure 2. Measuring Output Voltage Ripple

+ –

VOUT GND

COUT

4

DEMO MANUAL DC2860A

Rev. 0

12VIN, 1.2A LOAD ON EACH OUTPUT, NON-Burst Mode, 10mV/DIV, 500ns/DIV

VOUT1 (AC)

VOUT2 (AC)

VOUT3 (AC)

VOUT4 (AC)

dc2860a F04

QUICK START PROCEDURE

Figure 3. DC2860A/LTM8051 Efficiency vs Load Current

Figure 4. Output Voltage Ripples

Figure 5. Load Step Transient Test

Figure 6. Load Step Transient Test

LOAD CURRENT (A)0.1

EFFI

CIEN

CY (%

)

100

95

85

90

80

70

75

65

600.5 0.90.3 0.7

dc2860a F03

1.31.1

VIN = 12VVIN = 24VVIN = 36V

(VOUT1 = 5V, VOUT2 = 3.3V, VOUT3 = 2.5V, VOUT4 = 1.8V. SAME LOAD CURRENT AT EACH OUTPUT. Burst Mode OPERATION)

VIN = 12V, VOUT1 = 5V

VOUT1200mV/DIV

AC-COUPLED

0.7A LOAD STEP200mA/DIV

TOTAL IOUT1: 0.7A TO/FROM 1.4A

dc2860a F05

VIN = 12V, VOUT2 = 3.3V

VOUT2200mV/DIV

AC-COUPLED

0.7A LOAD STEP200mA/DIV

TOTAL IOUT2: 0.7A TO/FROM 1.4A

dc2860a F06

5

DEMO MANUAL DC2860A

Rev. 0

QUICK START PROCEDURE

Figure 7. Load Step Transient Test

Figure 8. Load Step Transient Test

Figure 9. Thermal Picture (VIN = 12V, 1.4A at Each Output. No Heat Sink, No Forced Airflow)

VIN = 12V, VOUT3 = 2.5V

VOUT350mV/DIV

AC-COUPLED

0.7A LOAD STEP200mA/DIV

TOTAL IOUT3: 0.7A TO/FROM 1.4A

dc2860a F07

VIN = 12V, VOUT4 = 1.8V

VOUT450mV/DIV

AC-COUPLED

0.7A LOAD STEP200mA/DIV

TOTAL IOUT4: 0.7A TO/FROM 1.4A

dc2860a F08

6

DEMO MANUAL DC2860A

Rev. 0

PARTS LISTITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 3 C1, C6, C21 CAP., 4.7µF, X5R, 50V, 10%, 0805 MURATA GRM21BR61H475KE51L SAMSUNG CL21A475KBQNNNE TDK C2012X5R1H475K125AB

2 4 C2, C8, C23, C26 CAP., 22µF, X5R, 10V, 20%, 0603 AVX 0603ZD226MAT2A MURATA GRM188R61A226ME15D SAMSUNG CL10A226MP8NUNE

3 2 C4, C20 CAP., 22µF, ALUM. ELECT., 63V, 20%, 6.3×7.7mm, CE-BS

SUN ELECTRONIC INDUSTRIES CORP 63CE22BS

4 1 C5 CAP., 47µF, X5R, 6.3V, 20%, 0805 MURATA GRM21BR60J476ME15L SAMSUNG CL21A476MQYNNNE TAIYO YUDEN JMK212BBJ476MG-T TDK C2012X5R0J476M125AC TAIYO YUDEN JMK212BJ476MG-T

5 3 C7, C22, C25 CAP., 100µF, X5R, 6.3V, 20%, 0805 MURATA GRM21BR60J107ME15K

6 4 C11, C12, C29, C30 CAP., 0.1µF, X5R, 16V, 10%, 0603 AVX 0603YD104KAT2A NIC NMCAVX 0603X5R104K16TRPF

7 1 C13 CAP., 1µF, X5R, 50V, 10%, 0603 AVX 06035D105KAT2A MURATA GRM188R61H105KAALD TAIYO YUDEN UMK107BJ105KA-T TDK C1608X5R1H105K080AB

8 4 C14, C15, C18, C19 CAP., 0.1µF, X7R, 50V, 10%, 0402 AVX 04025C104KAT2A MURATA GRM155R71H104KE14D MURATA GRM155R71H104KE14J TAIYO YUDEN UMK105B7104KV-FR TDK C1005X7R1H104K050BB

9 2 C16, C17 CAP., 10µF, X5R, 50V, 10%, 1210 TDK C3225X5R1H106K250AB MURATA GRM32ER61H106KA12L

10 2 R1, R15 RES., 1M, 1%, 1/10W, 0603, AEC-Q200 VISHAY CRCWAVX 06031M00FKEA VISHAY CRCWAVX 06031M00FKED NIC NRC06F1004TRF PANASONIC ERJ3EKF1004V

11 4 R2, R6, R16, R18 RES., 100k, 1%, 1/10W, 0603, AEC-Q200 VISHAY CRCWAVX 0603100KFKEA NIC NRC06F1003TRF PANASONIC ERJ3EKF1003V

12 2 R3, R13 RES., 0Ω, 1/8W, 0805 VISHAY CRCW08050000Z0EA YAGEO RC0805JR-070RL

13 1 R5 RES., 47.5k, 1%, 1/10W, 0603 VISHAY CRCWAVX 060347K5FKEA YAGEO RCAVX 0603FR-0747K5L

14 4 R7, R12, R19, R24 RES., 0Ω, 1/10W, 0603, AEC-Q200 VISHAY CRCWAVX 06030000Z0EA VISHAY CRCWAVX 06030000Z0EB NIC NRC06ZOTRF

15 1 R8 RES., 200k, 1%, 1/10W, 0603 NIC NRC06F2003TRF VISHAY CRCWAVX 0603200KFKEA YAGEO RCAVX 0603FR-07200KL

16 1 R11 RES., 23.2k, 1%, 1/10W, 0603 KOA SPEER RK73H1JTTD2322F PANASONIC ERJ3EKF2322V VISHAY CRCWAVX 060323K2FKEA

17 1 R17 RES., 78.7k, 1%, 1/10W, 0603 NIC NRC06F7872TRF STACKPOLE ELECTRONICS, INC. RMCFAVX 0603FT78K7 YAGEO RCAVX 0603FR-0778K7L

7

DEMO MANUAL DC2860A

Rev. 0

PARTS LISTITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

18 1 R20 RES., 118k, 1%, 1/10W, 0603, AEC-Q200 VISHAY CRCWAVX 0603118KFKEA

19 1 R23 RES., 24.9k, 1%, 1/10W, 0603, AEC-Q200 NIC NRC06F2492TRF VISHAY CRCWAVX 060324K9FKEA PANASONIC ERJ3EKF2492V

20 1 FB1 IND., 100Ω AT 100MHz, FERRITE BEAD, 25%, 8A, 6mΩ, 1812

WURTH ELEKTRONIK 74279226101

21 1 L1 IND., 0.22µH, PWR, SHIELDED, 30%, 9.5A, 7.3mΩ, 4020

WURTH ELEKTRONIK 744373240022

22 1 U1 IC, 40V, 1.2A QUAD STEP-DOWN µModule REGULATOR, BGA

ANALOG DEVICES LTM8051EY#PBF

Additional Demo Board Circuit Components

23 0 C3, C9, C10, C24, C27, C28 CAP., OPTION, 0603

24 0 R4, R9, R10, R14, R21, R22 RES., OPTION, 0603

Hardware: For Demo Board Only

25 14 E2, E3, E5, E7, E8, E9, E10, E16, E20, E21, E23, E24, E26, E27

TEST POINT, TURRET, 0.094" MTG. HOLE, PCB 0.062" THK

MILL-MAX 2501-2-00-80-00-00-07-0

26 20 E4, E6, E11, E12, E13, E14, E15, E17, E18, E19, E22, E25, E28, E29, E30, E31, E32, E33, E34, E35

TEST POINT, TURRET, 0.064" MTG. HOLE, PCB 0.062" THK

MILL-MAX 2308-2-00-80-00-00-07-0

27 2 JP1, JP2 CONN., HDR., MALE, 1×3, 2mm, THT, STR, NO SUBS. ALLOWED

SAMTEC TMM-103-02-L-S

28 1 FAB, PRINTED CIRCUIT BOARD DEMO CIRCUIT 2860A

29 1 STNCL1 TOOL, STENCIL, 700-DC2860A ANALOG DEVICES 830--DC2860A

30 4 MP1, MP2, MP3, MP4 STANDOFF, NYLON, SNAP-ON, 0.25" (6.4mm) KEYSTONE 8831 WURTH ELEKTRONIK 702931000

31 2 XJP1, XJP2 CONN., SHUNT, FEMALE, 2-POS, 2mm SAMTEC 2SN-BK-G

8

DEMO MANUAL DC2860A

Rev. 0

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9

DEMO MANUAL DC2860A

Rev. 0

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.

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10

DEMO MANUAL DC2860A

Rev. 0

ANALOG DEVICES, INC. 2020

12/20www.analog.com

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.

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