DEMO MANUAL DC2527A-B LTM4646 Dual 10A or Single 20A µmodule Regulator DESCRIPTION BOARD PHOTO

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1 DESCRIPTION Demonstration circuit 57A-B features the LTM 66EY, a dual A or single A high efficiency, switch mode step-down power µmodule regulator. The input voltage range is from.5v to V. With CPWR bias, input voltage can be as low as.75v. The output voltage range is.6v to 5.5V. De-rating is necessary for certain V IN, V OUT, frequency and thermal conditions. The DC57A-B offers the TRACK/SS pin allowing the user to program output tracking or soft-start period. The board operates in continuous conduction mode in heavy load conditions. For high efficiency at low load currents, the MODE_PLLIN jumper can select discontinuous conduction mode. The MODE_PLLIN DEMO MANUAL DC57A-B LTM66 Dual A or Single A µmodule Regulator pin also allows the LTM66 to synchronize to an external clock signal (between khz and.mhz). DC57A-B has the option of choosing both internal and external compensation circuit for LTM66. Tying the PHASMD pin to different pins generates certain phases of CLKOUT and Channel. The LTM66 data sheet must be read in conjunction with this demo manual prior to working on or modifying demo circuit DC57A-B. Design files for this circuit board are available at All registered trademarks and trademarks are the property of their respective owners. BOARD PHOTO dc57abf

2 DEMO MANUAL DC57A-B PERFORMANCE SUMMARY PARAMETER CONDITIONS VALUE Input Voltage Range.5V to V Output Voltages.V,.5V ±.5% Maximum Continuous Output Current De-rating is Necessary for Certain Operating Conditions. A DC for Each Channel See Data Sheet for Details Operating Frequency 5kHz Efficiency of Channel V IN = V, V OUT =.V, I OUT = A 86.75% See Figure Efficiency of Channel V IN = V, V OUT =.5V, I OUT = A 87.7% See Figure Load Transient of Channel V IN = V, V OUT =.V, I STEP = A to 5A 95mV See Figure Load Transient of Channel V IN = V, V OUT =.5V, I STEP = A to 5A mv See Figure 5 QUICK START PROCEDURE Demonstration circuit DC57A-B is an easy way to evaluate the performance of the LTM66EY. Please refer to Figure for proper measurement equipment setup and follow the procedure below:. Place jumpers in the following positions for a typical application: MODE RUN RUN CCM ON ON TRACK TRACK CLKOUT PHASE CURRENT LEVEL SOFT-START SOFT-START 9 %. With power off, connect the input power supply, load and meters as shown in Figure. Preset the load to A and V IN supply to V.. Turn on the power supply at the input. The output voltage of Channel should be.v ±.5% (.8V to.8v). The output voltage of Channel should be.5v ±.5% (.78V to.5v).. Vary the input voltage from.5v to V and adjust the load current of each channel from A-A. Observe the output voltage regulation, ripple voltage, efficiency, and other parameters. 5. (Optional) For optional load transient test, apply an adjustable pulse signal between IOSTEP_CLK and test points. The pulse amplitude sets the load step current amplitude. Keep the pulse width short (<ms) and pulse duty cycle low (<5%) to limit the thermal stress on the load transient circuit. Switch the jumper resistors R, R5 (on the backside of boards) to apply load transient on channel, channel correspondingly. 6. (Optional) LTM66 can be synchronized to an external clock signal. Place the JP jumper on EXT_CLK and apply a clock signal (V to 5V, square wave) on the CLKIN test point. 7. (Optional) The outputs of LTM66 can track another supply. If tracking external voltage is selected, the corresponding test points, TRACK, TRACK, need to be connected to a valid voltage signal. 8. (Optional) Channel and can be connected in parallel for a A polyphase operation on DC57A. Install Ω resistors on R9 and R7. dc57abf

3 DEMO MANUAL DC57A-B QUICK START PROCEDURE + + LOAD LOAD + + V IN + + Figure. Measurement Setup of DC57A dc57abf

4 DEMO MANUAL DC57A-B QUICK START PROCEDURE EFFICIENCY (%) V IN 8 V IN V IN 5 V IN V IN OUTPUT CURRENT (A) Figure. Measured Efficiency of Channel at V OUT =.V, f SW = 5kHz, CCM dc57ab F EFFICIENCY (%) V IN 8 V IN V IN 5 V IN V IN OUTPUT CURRENT (A) Figure. Measured Efficiency of Channel at V OUT =.5V, f SW = 5kHz, CCM dc57ab F dc57abf

5 DEMO MANUAL DC57A-B QUICK START PROCEDURE V OUT : 5mV/DIV I OUT_STEP :.A/DIV dc57ab F Figure. Measured Load Transient V IN = V, V OUT =.V, I STEP = A to 5A V OUT : 5mV/DIV I OUT_STEP :.A/DIV dc57ab F5 Figure 5. Measured Load Transient V IN = V, V OUT =.5V, I STEP = A to 5A dc57abf 5

6 DEMO MANUAL DC57A-B QUICK START PROCEDURE Figure 6. Thermal Image of LTM66 V IN = V, V OUT =.V, I LOAD = A, V OUT =.5V, I LOAD = A Ambient Temperature = 5. C, No Forced Air Flow 6 dc57abf

7 DEMO MANUAL DC57A-B PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components CIN CAP., 8µF, 5V, OS-CON 8.9 PANASONIC, 5SVPF8M CIN, CIN, CIN, CIN5 CAP., X5R, µf, 5V, %, MURATA, GRMER6E6KE5L COUT, COUT7 CAP., 7µF,.5V, POSCAP, DL PANASONIC, ETPF7M5H 6 COUT, COUT, COUT, COUT5, COUT6, CAP., X5R, µf, 6.V, %, AVX, 6D7MATA COUT8 5 C5, C7 CAP., X5R,.µF, 5V, %, 6 AVX, 6DKATA 6 C, C CAP., CG, pf, 5V, %, 6 AVX, 65AFATA 7 C CAP., X5R,.7µF, V,%, 6 TDK, CGBBX5RA75K55AC 8 R, R, R, R6 RES., Ω, %, 6 NIC, NRC6FRTRF 9 R, R RES., 9k, %, 6 VISHAY,CRCW69KFKEA 5 R9, R, R5, R8, R5 RES., 6.k, %, 6 VISHAY, CRCW66KFKEA R, R RES., 6.k, %, 6 VISHAY, CRCW66KFKEA R9 RES.,.k, %, 6 VISHAY,CRCW6KFKEA R, R7, R6 RES., k, %, 6 VISHAY, CRCW6KFKEA R RES., 5k, %, 6 VISHAY,CRCW65KFKEA 5 R, R5 RES., 9.9k, /W, %, 6 VISHAY CRCW69K9FKEA 6 R5 RES.,.k, %, 6 VISHAY, CRCW6KFKEA 7 U IC, LTM66EY, BGA LINEAR TECH. LTM66EY#PBF Additional Demo Board Circuit Components C, C CAP.,, 85 C6, C8, C, C7, C8, C9, C, C CAP.,, 6 Q XSTR, N-CH V A TO-5 VISHAY SUD5N-8M8P-GE R5, R7, R9, R6, R7, R5, R55, R56 RES.,, R7, R, R, R5, R9, R5, R5 RES.,, %, 6 VISHAY, CRCW6ZEA 6 R RES., Ω, /W, VISHAY, CRCWZEF 7 R5 RES.,, 8 R7 RES.,.5Ω, W, 5 VISHAY, WSL5R5FEA 9 R8 RES.,, 5 C, C CAP., X5R,.µF, 5V, %, 6 AVX,65CKATA C5, C6 CAP., X7R, µf, V, %, 6 AVX, 6ZC5KATA Hardware: For Demo Board Only E-E TESTPOINT, TURRET,.9" PBF MILL-MAX, JP, JP5 CONN., HEADER,, mm WURTH ELEKTRONIK, 66 JP, JP, JP, JP7 CONN., HEADER,, mm WURTH ELEKTRONIK, 68 JP6 CONN., HEADER,, mm WURTH ELEKTRONIK, 6 5 JP8 CONN., HEADER,, mm WURTH ELEKTRONIK, XJP-XJP7 SHUNT, mm WURTH ELEKTRONIK, 68 7 J, J CONN, BNC, 5 PINS CONNEX, 8 6 J-J9 JACK BANANA KEYSTONE, (STAND-OFF) STAND-OFF, SNAP ON NYLON.5" TALL KEYSTONE, 88(SNAP ON) dc57abf 7

8 5 5 DEMO MANUAL DC57A-B SCHEMATIC DIAGRAM VIN+ E VIN REVISION HISTORY ECO REV DESCRIPTION APPROVED DATE PRODUCTION YAN L VIN TEMP+ TEMP- CLKOUT EXTVCC VO+ J CIN CIN CIN CIN5 +.5V-V CIN uf uf uf uf E5 E9 CLKIN 8uF 5V 5V 5V 5V E E VO+ 5V JP E8 E6 MODE C VOUT R D D J5 EXT_CLK VIN VOUT VIN- CCM J8 E5 R DCM 5 6.5V * CPWR E ON % 5% RUN VIN R 9K RUN C8 TEMP+ R 5K DRVCC C 85 RUN ON VIN + COUT 7uF.5V RUN COUT uf 6.V COUT uf 6.V * AMP ASSY IC -A LTM66EY U -B LTM66EY U VOUT 5 R VO- D F B8 A8 H D6 D7 E6 E8 F5 F7 G6 G8 H6 H7 J J5 J6 J7 K K6 K7 L L6 L7 VRNG FREQ TEMP+ TEMP- TEMP- PHASEMD K VIN K5 VIN L VIN L5 VIN A VIN A5 VIN VIN VIN B5 B TEMP+ L8 VO- R9 TRACK SEL. JP 6.K R7 R TRACK TRACK 6.K E VO+ F8 VOUTS E CPWR TRACK SEL. R SOFT-START R H5 D5 RUN RUN D5 6.K H TRACK TRACK/SS TRACK/SS F VOUT 6.K JP EXT. R5 C5 TRACK TRACK C C.uF C6 SOFT-START 6.K E 5 6 VO+ R8 JP5 VOUT C7 6.K H VFB E VFB.uF VO+ J VOUT VOUT C8 R9 E6 J D R5 R K VOUT VOUTS-.K VOUT VOUT.K K L VOUT VO- SW U VOUT L VOUT * VOUT SW C8 TP.V J6 * LTM66/66EY SW D8 R56 C COUT5 R COUT6 COUT8 + COUT7 G VO+ VOUTS uf PGOOD E5 uf uf PGOOD 6.V 7uF 6.V 6.V.5V R9 R E COMPB E J7 C7 K R6 COMP COMPA E G VO- VO- VFB VFB E7 R5 C C R5 J SW VOUTS- S S H D 6.K pf TP C9 C R55 VO- H8 SW A B B J8 A A6 SW A6 A7 B PGOOD G5 B B6 PGOOD B6 B7 E C R7 COMP G C C COMPA C C5 K C R6 R5 C5 C6 G C6 C7 pf COMPB K8 OFF COUT uf 6.V J9 MODE-PLLIN F CLKOUT F F6 DRVCC G7 EXTVCC E7 VOUT A VOUT A VOUT B VOUT B VOUT C VOUT C VOUT D CURRENT LEVEL OFF JP JP7 R5 R5 C.7uF R 9k E9 TEMP+ TEMP+ CLKOUT E R7 JP6 PHASE VIN o A TEMP- o 6 McCarthy Blvd. A E 9 CUSTOMER NOTICE R5 APPROVALS Milpitas, CA 955 LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A o Phone: (8)-9 CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; 6 TECHNOLOGY Fax: (8)-57 HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES. VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL LT LTC Confidential-For Customer Use Only NOTE: UNLESS OTHERWISE SPECIFIED APPLICATION. COMPONENT SUBSTITUTION AND PRINTED APP ENG. YAN L. TITLE: SCHEMATIC CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR. ALL RESISTORS AND CAPACITORS ARE 6. TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. HIGH EFFICIENCY, DUAL PHASE STEP-DOWN umodule REGULATOR SIZE IC NO. REV. LTM66/66EY N/A DEMO CIRCUIT 57A THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONE DATE: Friday, October 6, 7 SHEET OF 8 dc57abf

9 5 5 DEMO MANUAL DC57A-B SCHEMATIC DIAGRAM TEMP+ TEMP+ R 5K R5 5K D D IONAL JUMPER FOR OUTPUT CONFIGURATION Load Transient Circuit VOUT VOUT R9 RUN RUN VOUT J C.uF R OHm.5W R5 C.uF J VOUT R7 VFB C5 uf C C Q SUD5N-9P C6 uf R6 K E7 IOSTEP CLK JP8 IOSTEP R7.5 W 5 R8 5 E8 B B CUSTOMER NOTICE APPROVALS LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; TECHNOLOGY Fax: (8)-57 HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES. VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL LT LTC Confidential-For Customer Use Only A A APPLICATION. COMPONENT SUBSTITUTION AND PRINTED APP ENG. YAN L. TITLE: SCHEMATIC CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. HIGH EFFICIENCY, DUAL PHASE STEP-DOWN umodule REGULATOR THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONE SIZE N/A DATE: 6 McCarthy Blvd. Milpitas, CA 955 Phone: (8)-9 LTM66/66EY IC NO. REV. DEMO CIRCUIT 57A Friday, October 6, 7 SHEET OF 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. dc57abf 9

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