QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1148 4A HIGH DENSITY POWER MODULE LTM4604EV DESCRIPTION Demonstration circuit 1148 features the LTM®4604EV, the high efficiency, high density switch mode stepdown power module. The input voltage range is from 2.25V to 5.5V. The output voltage is jumper selectable from 0.8V to 3.3V; refer to step down ratio curve in the LTM4604 datasheet. The rated load current is 4A, while de-rating is necessary for certain VIN, VOUT, and thermal conditions. Integrated input and output filters enable a simple PCB layout. Only bulk input and output capacitors are needed externally. The LTM4604 allows the user to program output ramp-up and ramp-down through the TRACK/SS pin. The output can be set to coincidentally or ratiometrically track to another voltage rail. Design files for this circuit board are available. Call the LTC Factory. , LTC, LT and LTM are registered trademarks of Linear Technology Corporation. Table 1. Performance Summary (TA = 25°C) PARAMETER CONDITION VALUE Minimum Input Voltage 2.25V Maximum Input Voltage 5.5V Output Voltage VOUT Jumper selectable (open for 0.8V) 1.2V, 1.5V, 1.8V, 2.5V, 3.3V; ± 2% Maximum Continuous Output Current De-rating is necessary for certain VIN, VOUT, and thermal conditions 4ADC Default Operating Frequency 1 MHz Efficiency VIN=5V, VOUT =3.3V, IOUT =4A 88%, See Figure 3 Load Transient VIN=3.3V, VOUT =1.2V See Figure 4 for details QUICK START PROCEDURE Demonstration circuit 1148 is easy to set up to evaluate the performance of the LTM4604EV. Please refer to Figure 1 for proper measurement equipment setup and follow the procedure below: 1. Place jumpers in the following positions for a typical 1.2VOUT application: Vout Select RUN TRACK 1.2V ON OFF 2. With power off, connect the input power supply, load and meters as shown in Figure 1. Preset the load to 0A and Vin supply to be less than 5.5V. 3. Turn on the power at the input. The output voltage should be 1.2V ± 2%. 4. Once the proper output voltage is established, adjust the load within the operating range and observe the output voltage regulation, ripple voltage, efficiency and other parameters 5. To measure input and output ripple, please refer to Figure 2 for proper setup. 6. For optional load transient test, apply adjustable pulse signal between IOSTEP CLK and GND pins. Pulse amplitude sets the current step. The pulse signal should have very small duty cycle (<5%) to limit the thermal stress on the transient load circuit. The out- 1 QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1148 4A HIGH DENSITY POWER MODULE put transient current can be monitored at BNC connector J1 (10mV/A), the output voltage can be monitor at BNC connector J2. Figure1. Proper Measurement Equipment Setup + ─ Input or Output Capacitor Figure 2. Scope Probe Placements for Measuring Input or Output Ripple. 2 QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1148 4A HIGH DENSITY POWER MODULE Efficiency vs. Load Current @ 3.3Vin 95.00 95.00 90.00 90.00 85.00 85.00 80.00 80.00 Efficiency (%) Efficiency (%) Efficiency vs. Load Current @ 5Vin 75.00 75.00 70.00 Vo = 1.2V 65.00 Vo = 1.5V 60.00 Vo = 1.8V 60.00 55.00 Vo = 2.5V 55.00 Vo = 3.3V 50.00 0 1 2 3 Load Current (A) 70.00 65.00 Vo = 1.2V Vo = 1.5V Vo = 1.8V 50.00 4 0 1 2 Load Current (A) 3 4 Figure 3. Measured Supply Efficiency with Different VIN and VOUT Istep 1A/div Vo(AC) 20mV/DIV Vin = 3.3V Vout =1.2V 1A to 3A LOAD STEP Cout = 1 X 10uF ceramic (1206, X5R, 6.3V), 1X100uF ceramic (1812, X5R, 6.3V) Figure 4. Measured Load Transient Response (2A Step, 25% to 75%) 3 TP1 GND RUN/SS COMP PGOOD GND GND VIN TP8 TP7 TP6 TP5 TP4 TP3 VIN TP2 2.25V-5.5V VIN C1 100uF 6.3V Cin1 10uF 6.3V ON OFF R1 100K 5% (OPT) (OPT) JP6 2 RUN/SS R2 510K 5% VIN CSS C2 Cin2 10uF 6.3V 1 3 D1 G1 F1 B1 C1 C3 C4 C5 C6 C7 D7 E6 E7 RUN/SS COM P PGOOD VIN VIN VIN VIN VIN VIN VIN VIN VIN VIN LTM4604EV U1 D8 D9 D10 D11 E8 E9 E10 E11 F6 F7 F8 F9 F10 F11 E1 G2 B4 B3 G6 G7 G8 G9 G10 G11 VIN R11 OPT R3 10K 1.5V R6 5.76K 1% R5 10K 1% JP7 ON OFF Manjing Xie R7 4.02K 1% JP3 1.8V 9/28/06 9/28/06 DATE Monday , April 30, 2007 DESIGNER ENGINEER APPROVED CHECKED HELEN APPROVALS CO2 (OPT) 1 TECHNOLOGY FOR VIN > 3.8 V 2 3 4 5 VO- GND FILENAME: CAGE CODE DWG NO SHEET 1 DC1148A OF 1 REV A VOUT 4A MAX VO+ TRACK TP12 TP11 TP10 TP9 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 TP14 J2 VOUT LTM4604V High Density 4A Step-Down Power Module * ** 1 CO5 100uF 6.3V CP (OPT) CO4 (OPT) FOR VIN > 3.0 V R9 1.58K 1% (OPT) SCALE: SIZE TITLE R10 ** JP5 3.3V CO3 22uF 6.3V J1 IOSTEP IOSTEP CLK R8 2.37K 1% * JP4 2.5V VO SELECT CO1 (OPT) JP2 CFF (OPT) R4 0.01 1.2V DRAWN TP15 SUD50N03-10CP-E3 CONTRACT NO. 2 1 Q1 JP1 TRACK R12 (OPT) C3 4.7uF 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 SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. CUSTOMER NOTICE T RACK F/B SW SW VO UT VO UT VO UT VO UT VO UT VO UT VOUT VOUT VOUT VOUT VOUT VOUT VOUT VOUT VOUT VOUT VOUT VOUT VOUT VOUT GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND G5 G4 G3 F5 F4 F3 E5 E4 C11 C10 C9 C8 B11 B10 B9 B8 B7 B6 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 3 2 1 3 2 3 4 5 DYNAMIC LOAD CIRCUIT QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1148 4A HIGH DENSITY POWER MODULE 4 2 2 1 1 1 0 1 0 0 0 1 1 0 1 1 1 1 1 1 0 0 2 5 2 3 10 4 4 1 2 3 4 5 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 1 2 3 4 5 6 7 CAP., X5R, 100uF, 6.3V, 20%, 1812 CAP., X5R, 10uF, 6.3V, 10%, 1206 CAP., X5R, 22uF, 6.3V, 10%, 1206 RES., CHIP, 10K, 1/16W, 1%, 0603 I.C., LTM4604EV#PBF,15mm x 9mm x 2.3mm, LGA Part Description CAP., 0603 CAP., X5R, 4.7uF, 6.3V, 10%, 0603 CAP., 1210 CAP., 1812 CAP., 0603 N-Channel 30-V MOSFET,TO-252 RES., CHIP, 100K, 1/16W, 5% ,0603 RES., 0603 RES., CHIP, 10K, 1/16W, 1%, 0603 RES., CHIP, 0.01, 0.5W, 1% ,1206 RES., CHIP 5.76K, 1/16W, 1%, 0603 RES., CHIP 4.02K, 1/16W, 1%, 0603 RES., CHIP, 2.37K, 1/16W, 1%, 0603 RES., CHIP, 1.58K, 1/16W, 1%, 0603 RES., 0603 RES., 0603 J1,J2 JP1-JP5 JP6,JP7 JP1,JP6,JP7 TP1,TP4-TP9,TP12,TP14,TP15 TP2,TP3,TP10,TP11 STAND OFF CONN, BNC, 5PINS 2MM SINGLE ROW HEADER, 2 PIN 2MM SINGLE ROW HEADER, 3 PIN SHUNT, TESTPOINT, TURRET, .095" BANANA JACK STAND-OFF, NYLON 0.50" tall H A R D W A R E -F O R D E MO B O A R D O N L Y : C2(OPT) C3 CO1,CO2(OPT) CO4(OPT) CSS,CP, CFF(OPT) Q1 R1 R2(OPT) R3 R4 R6 R7 R8 R9 R10,R11(OPT) R12 A D D IT IO N A L D E MO B O A R D C IR C U IT C O MP O N E N T S : C1,CO5 CIN1,CIN2 CO3 R5 U1 R E Q U IR E D C IR C U IT C O MP O N E N T S : Item Qty Reference CONNEX, 112404 SAMTEC, TMM-102-02-L-S SAMTEC, TMM-103-02-L-S SAMTEC, 2SN-BK-G MILL-MAX, 2501-2-00-80-00-00-07-0 KEYSTONE, 575-4 KEYSTONE, 8833(SNAP ON) VISHAY, CRCW060310K0FKEA VISHAY, WSL1206R0100FEA18 VISHAY, CRCW06035K76FKEA VISHAY, CRCW06034K02FKEA VISHAY, CRCW06032K37FKEA VISHAY, CRCW06031K58FKEA VISHAY, SUD50N03-10CP-E3 VISHAY, CRCW0603100KJNEA AVX, 06036D475KAT2A TDK, C4532X5R0J107M AVX, 12066D106KAT2A AVX, 12066D226KAT2A VISHAY, CRCW060310K0FKEA LINEAR TECH., LTM4604EV#PBF Manufacturer / Part # QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1148 4A HIGH DENSITY POWER MODULE 5