Evaluates: MAX MAX38801 Evaluation Kit. Features. General Description. Applications

Transcription

1 General Description The MAX3880 evaluation kit (EV kit) serves as a reference platform for evaluating the MAX3880 voltage regulator IC. This single-chip, integrated switching regulator provides an extremely compact, highly efficient, fast, accurate, and reliable power delivery solution for low-output voltage applications. The MAX3880 has different programmability options to enable a wide range of configurations. The EV kit consists of a fully-assembled and tested Printed Circuit Board (PCB) implementation of the MAX3880. Jumpers, test points and input/output connectors are included for flexibility and ease-of-use. Refer to the data sheet for ordering information and more details. Applications Servers/µServers I/O and Chipset Supplies GPU Core Supply DDR Memory VDDQ and VTT Point-of-Load (PoL) Applications Ordering Information appears at end of data sheet. Features High-Efficiency Solution Up to 96% Peak Up to 9% Full-Load Up to 94% Light-Load Efficiency at A with DCM Enabled Inductor Valley Current Limit is Configured to A (R_SEL = R = 46.4kΩ) Programmable Switching Frequency from 400kHz to 900kHz Programmable Positive and Negative OCP Limit Programmable Reference Voltage with External Input Option Fast Transient Response with Quick PWM Architecture Differential Remote Sense with Open-Circuit Detection Percentage-Based Output Power Good and OVP Open-Drain Status Indicator (STAT) Pin Input Undervoltage and Overvoltage Lockout Adaptive Dead Time Control Integrated Boost Switch 9-Bump WLCSP (.mm x.8mm) Footprint Operation Using Ceramic Input and Output Capacitors Quick PWM is a trademark of Maxim Integrated Products, Inc ; Rev ; 5/8

2 Quick Start Required Equipment MAX3880 EV kit V, 0A DC power supply Load capable of sinking A Digital voltmeter Oscilloscope Procedure The EV kit is fully assembled and tested. Follow the steps below to verify the board operation. Caution: Do not turn on power supply until all connections are completed. ) Connect a V power supply to the VDD and banana jacks. ) Make sure the shunt is installed on: a) J6 (-) to close the sense line. b) J4 (-) to power up the on-board LDO which regulates.8v. c) J (-) to provide the.8v bias supply to the regulator from the on-board LDO. d) J5 (3-5) to pull up the STAT pin. e) J5 (4-6) to pull up the OE pin. 3) Connect a voltmeter to the and banana jacks (J8, J, J3, and J4 can be used as well). 4) Turn on the power supply. 5) Verify that the voltmeter reads.05v. Detailed Description of Hardware The MAX3880 provides compact high-efficiency power delivery for precision outputs that demand fast transient response. The 9-ball (.mm x.8mm) CSP package minimizes the PCB area. The EV kit is preset for.05v output and can provide up to A from a 6.5V to 4V input supply. Bias Supply The MAX3880 EV kit has an on-board LDO (U) that can provide the required.8v VCC bias voltage to the regulator as well as the pull up voltage for the Output Enable (OE) input. This allows testing the part using a single external power supply. To enable the on-board LDO install the shunt on jumper J4. To effectively use the LDO to supply the VCC bias voltage to the regulator also install the shunt on jumper J. In order to properly measure the efficiency of the regulator, the LDO should not be active. To disable it, both the shunts on J4 and J need to be removed. An external.8v, 0.A current limited power supply needs to be connected between J- and ground. The same signal should be connected to J0 (-) to pull up the OE pin. Regulator enable To enable the regulator, OE pin needs to be pulled high. If the on-board.8v LDO is active (the shunt on jumper J4 is in place), the output voltage can be used for the purpose. Installing a shunt on J5 (4-6) pulls the OE signal high to.8v through a 0kΩ resistor. To shut down the regulator a shunt needs to be installed on J0. This forces the OE pin low. Status Pin The MAX3880 has an open collector status (STAT) output to report fault or output under voltage event. Install a shunt on J5 (3-5) to pull up this pin to V CC through a 0kΩ resistor. Since STAT pin is 3.3V tolerant, a shunt on J5 (-3) can be installed to pull up this pin through a 0kΩ resistor to the 3.3V provided by the on board regulator U3 (install a shunt on J5 (3-4) to enable the LDO). Scenario Selection Several parameters of the MAX3880 can be programmed to allow optimization for specific applications. By selecting the appropriate value of resistor R_SEL (R) and capacitor C_SEL (C4), the optimum set of parameters (scenario) can be programmed. While R_SEL selects the proper scenario, C_SEL determines the nominal F SW. The MAX3880 features a configuration table to provide a wide range of options. Table shows the scenario table for MAX3880. Maxim Integrated

3 Setting the Output Voltage The output voltage of MAX3880 depends both on the reference voltage (V REF ) and the resistor divider ratio. Equation R 6 = VREF + R 9 The reference voltage is selected through RSEL (see Table ) and can be either internal or external (refer to the data sheet for more details). In order to optimize the common mode rejection of the error amplifier, choose the voltage divider resistors so that their parallel resistance R PAR is as close as possible to kω. Equation RPAR R6 = VREF RPAR R9 = R6 R6 RPAR Operation with External V REF When using an external reference adopt the configuration shown in Figure. Once OE is asserted, the regulator briefly discharges the SENSE- node and releases it as regulation begins. In this case, the soft-start ramp is determined by the external low-pass filter time constant. The external filter time constant needs to be lower than T SS /3 in order to avoid premature assertion of STAT pin while the output voltage is still ramping. The external reference voltage can be applied prior to enabling the regulator, or ramped up right after enable is asserted. In both cases, the low-pass filtered reference voltage at SENSE- pin must reach its final value within T SS. Typical values for the filter components are: RF =.kω CF = 0.μF where, R 6 = Top divider resistor R 9 = Bottom divider resistor R PAR = Desired parallel resistance of R6 and R9 V OUT = Output voltage V REF = Reference voltage Table. MAX3880 Configuration Table R_SEL (kω) VREF (V) SOFT- START TIME (TSS) (ms) VALLEY OCP INCEPTION (A) OPERATION MODES.78 CCM CCM/DCM CCM CCM/DCM 9.09 Ext. CCM CCM/DCM CCM REPORTING (CURRENT/ TEMP) Current RSENSE (GAIN) (MΩ) 7.5 Temp CCM/DCM 07 Current.05. 0pF FSW (khz) C_SEL 00 pf 80 pf TSTAT (µs) Ext..5 5 CCM Temp Maxim Integrated 3

4 Input Voltage Monitoring VDD and sense points as well as J3 can be used to monitor the input supply. Output Voltage Monitoring J and J3 monitor the output voltage. These test points should not be used for loading. Use scopejack J4 to monitor the output voltage ripple on an oscilloscope. Efficiency Measurement The following steps describe how to measure the regulator efficiency. ) Connect a V power supply to the VDD and banana jacks. To avoid the input voltage to drop at high load due to power losses on connection cables connect the sense lines of the power supply to VDD and headers. ) Connect an external.8v, 0.A current limited power supply between J- and ground 3) Connect the same power supply to J0- to enable the regulator. 4) Connect a load to the and banana jacks for better results. J8 can also be used for low currents. 5) Make sure the shunt is installed on J6 (-) to close the sense line 6) Remove all the other jumpers. 7) Connect a voltmeter to J or J3. 8) Turn on the power supply. 9) Measure V IN, I IN, V OUT, I OUT, V BIAS, and I BIAS. 0) Calculate the efficiency as: Equation 3 IOUT η= ( VIN I IN ) + (VBIAS I BIAS ) VCC VDDH CVCC VCC VDDH CIN MAX3880 BST CBST RSTAT VX LOUT STAT SENSE+ RFB ROE OE A PGM SENSE- CF RF RFB VREF Kelvin Connection to Load COUT C_SEL R_SEL Figure. Electrical Connections to Use the External Voltage Reference Feature. Maxim Integrated 4

5 MAX3880 EV Kit Bill of Materials ITEM REF_DES DNI/D NP QTY MFG PART # MFG VALUE DESCRIPTION COMMENTS C, C - TPSE57M06R000 AVX 50UF CAPACITOR; SMT; 7343; TANTALUM; 50uF; 6V; 0%; TPS; -55 C to +5 C C3 - C040X7R60-04KNE; CL05B04KO5NNNC; GRM55R7C04KA88; C005X7RC04K; CC040KRX7R7BB04; EMK05B704KV VENKEL LTD.;SAMSUNG ELECTRONICS;MURATA;TDK;YAGEO PHICOMP;TAIYO YUDEN 0.UF 3 C4 - ECJ-0EBE8K PANASONIC 80PF CAPACITOR; SMT (040); CERAMIC CHIP; 0.UF; 6V; TOL=0%; TG=-55 DEGC TO +5 DEGC; TC=X7R; CAPACITOR; SMT (040); CERAMIC CHIP; 80PF; 5V; TOL=0%; MODEL=ECJ SERIES; TG=-55 DEGC TO +5 DEGC; TC=X7R 4 C5, C6, C0, C - 4 C36X7RC06M60AC TDK 0UF 5 C7, C, C54-3 EMK07B705MA TAIYO YUDEN UF CAPACITOR; SMT (06); CERAMIC CHIP; 0UF; 6V; TOL=0%; MODEL=C SERIES; TG=-55 DEGC TO +5 DEGC; TC=X7R CAPACITOR; SMT (0603); CERAMIC CHIP; UF; 6V; TOL=0%; MODEL=M SERIES; TG=-55 DEGC TO +5 DEGC; TC=X7R 6 C8 - GRM88R7E474KA MURATA 0.47UF CAPACITOR; SMT (0603); CERAMIC CHIP; 0.47UF; 5V; TOL=0%; MODEL=GRM SERIES; TG=-55 DEGC TO +5 DEGC; TC=X7R 7 C9, C55 - JMK05BBJ475MV; C005X5R0J475M050BC TAIYO YUDEN;TDK 4.7UF CAPACITOR; SMT (040); CERAMIC CHIP; 4.7UF; 6.3V; TOL=0%; TG=-55 DEGC TO +85 DEGC; TC=X5R 8 C, C5, C6, C0, C34, C4, C44-7 C0805C6M9PAC; GRMBR60J6ME39; JMKBJ6MG; CLA6MQCLQN KEMET;MURATA;TAIYO YUDEN;SAMSUNG ELECTRO-MECHANICS UF CAPACITOR; SMT (0805); CERAMIC CHIP; UF; 6.3V; TOL=0%; TG=-55 DEGC TO +5 DEGC; TC=X5R 9 C3, C4, C7-C9, C4, C46, C50-8 C0X6S0J6M5AB;GRMBC80J TDK;MURATA UF CAPACITOR; SMT (0805); CERAMIC CHIP; UF; 6.3V; TOL=0%; TG=-55 DEGC TO +05 DEGC; TC=X6S 0 C4 - C040C03K3RAC; GRM55R7E03KA0; C005X7RE03K KEMET;MURATA;TDK 0.0UF CAPACITOR; SMT (040); CERAMIC CHIP; 0.0UF; 5V; TOL=0%; TG=-55 DEGC TO +5 DEGC; TC=X7R; C5, C56 - C040X7R50-53KNE;GRM55R7E53KA6 VENKEL LTD.;MURATA 0.05UF CAPACITOR; SMT (040); CERAMIC CHIP; 0.05UF; 5V; TOL=0%; TG=-55 DEGC TO +5 DEGC; TC=X7R C36 - C040X5R6R3-05KNP; C005X5R0J05K; GRM55R60J05KE9; JMK05BJ05KV VENKEL LTD;TDK;MURATA;TAIYO YUDEN UF CAPACITOR; SMT (040); CERAMIC CHIP; UF; 6.3V; TOL=0%; TG=-55 DEGC TO +85 DEGC; TC=X5R; 3 C37 - C005X7RH68K TDK 6800PF CAPACITOR; SMT (040); CERAMIC CHIP; 6800PF; 50V; TOL=0%; MODEL=C SERIES; TG=-55 DEGC TO +5 DEGC; TC=X7R 4 C38 - C040C53K4RAC; GRM55R7C53KA0 KEMET;MURATA 0.05UF CAPACITOR; SMT (040); CERAMIC CHIP; 0.05UF; 6V; TOL=0%; TG=-55 DEGC TO +5 DEGC; TC=X7R 5 C39 - C005X7RHK050BA TDK 00PF CAPACITOR; SMT (040); CERAMIC CHIP; 00PF; 50V; TOL=0%; MODEL=C SERIES; TG=-55 DEGC TO +5 DEGC; TC=X7R 6 D - EZ5D5 MICRO COMMERCIAL COMPONENTS 5V DIODE; ZNR; THROUGH HOLE-AXIAL LEAD (DO-4); VZ=5V; IZ=0.A 7, TP-TP3, VDD, EMERSON NETWORK POWER CONNECTOR; MALE; PANELMOUNT; BANANA JACK; STRAIGHT; PIN 8 _HEADER,, J9, VDD_HEADER, VX - 5 PEC0SAAN SULLINS ELECTRONICS CORP PEC0S AAN CONNECTOR; MALE; THROUGH HOLE; BREAKAWAY; STRAIGHT; PIN 9 _MAXIMPAD, _MAXIMPAD, J, J6, VDD_MAXIMPAD, _MAXIMPAD - 6 MAXIMPAD N/A MAXIMP AD EVK KIT PARTS; MAXIM PAD; NO WIRE TO BE SOLDERED ON THE MAXIMPAD Maxim Integrated 5

6 MAX3880 EV Kit Bill of Materials (continued) ITEM REF_DES DNI/D NP QTY MFG PART # MFG VALUE DESCRIPTION COMMENTS 0 J, J4, J0-J3, J6-7 PEC0SAAN SULLINS PEC0S AAN CONNECTOR; MALE; THROUGH HOLE; BREAKAWAY; STRAIGHT; PINS J3, J4 - SCOPE_PROBE_JACK MAXIM SCOPE_ PROBE_ JACK EVKIT PART-SCOPE_PROBE_JACK J5, J5 - PEC03DAAN SULLINS ELECTRONICS CORP. PEC03D AAN CONNECTOR; MALE; THROUGH HOLE; BREAKAWAY; STRAIGHT THROUGH; 6PINS; -65 DEGC TO +5 DEGC 3 J7 - PEC04SAAN SULLINS ELECTRONICS CORP. 4 J8 - ED0/DS ON-SHORE TECHNOLOGY INC. PEC04S AAN CONNECTOR; MALE; THROUGH HOLE; BREAKAWAY; STRAIGHT; 4PINS ED0/ DS CONNECTOR; FEMALE; THROUGH HOLE; BLUE TERMINAL BLOCK; STRAIGHT; PINS 5 L - PCMC063T-R0MN SUSUMU CO LTD 0.0UH INDUCTOR; SMT; CHOKE; TOL=+/-0%; 4A; 6 R - CR040-6W-464FT; CRCW04046K4FK VENKEL LTD.;VISHAY DALE 46.4K RESISTOR; 040; 46.4K OHM; %; 00PPM; 0.063W; THICK FILM 7 R, R3 - CRG040F0K TE CONNECTIVITY 0K RESISTOR; 040; 0K OHM; %; 00PPM; 0.063W; THICK FILM 8 R6-5 RC040JR-070RL; CR040-6W-000RJT YAGEO PHYCOMP;VENKEL LTD. 0 RESISTOR; 040; 0 OHM; 5%; JUMPER; 0.063W; THICK FILM 9 R5, R8, R - 3 ERJ-GEJ03X PANASONIC 0K RESISTOR; 040; 0K OHM; 5%; 00PPM; 0.0W; THICK FILM 30 R6, R3 - CRCW040K0FK VISHAY DALE.K RESISTOR; 040;.K; %; 00PPM; 0.065W; THICK FILM 3 R9 - ERA-AEB80X PANASONIC.8K RESISTOR; 040;.8K OHM; 0.%; 5PPM; 0.063W; METAL FILM 3 R0 - CRCW040K00JK VISHAY DALE K RESISTOR; 040; K OHM; 5%; 00PPM; 0.063W; METAL FILM 33 R4 - RCC-040PW00RF INTERNATIONAL MANUFACTURING SERVICE 00 RESISTOR; 040; 00 OHM; %; 00PPM; 0.080W; THICK FILM 34 SU-SU5-5 STC0SYAN SULLINS ELECTRONICS CORP. STC0S YAN TEST POINT; JUMPER; STR; TOTAL LENGTH=0.56IN; BLACK; INSULATION=PBT CONTACT=PHOSPHOR BRONZE; COPPER PLATED TIN OVERALL 35 U - MAX3880HCS+ MAXIM MAX3880 HCS+ EVKIT PART-IC; VREG; INTEGRATED; STEP-DOWN SWITCHING REGULATOR WITH SELECTABLE APPLICATION CONFIGURATION; CSP9 36 U - LP99AIM5-.8/NOPB TEXAS INSTRUMENTS LP99AI M5-.8/NOP B IC; VREG; MICROPOWER 50-mA LOW-NOISE ULTRALOW-DROPOUT REGULATOR DESIGNED FOR USE WITH VERY LOW-ESR OUTPUT CAPACITOR; SOT U3 - LP99AIM5-3.3/NOPB TEXAS INSTRUMENTS LP99AI M5-3.3/NOP B IC; VREG; MICROPOWER 50-mA LOW-NOISE ULTRALOW-DROPOUT REGULATOR DESIGNED FOR USE WITH VERY LOW-ESR OUTPUT CAPACITOR; SOT PCB - MAX3880 MAXIM PCB PCB:MAX C8, C9 DNP 0 N/A N/A PACKAGE OUTLINE 7343 HEIGHT 4.3MM ELECTROLYTIC CAPACITOR 40 C30, C33, C40, C43, C45, C47-C49, C5, C53, C, C6, C7 DNP 0 N/A N/A PACKAGE OUTLINE 0805 NON-POLAR CAPACITOR Maxim Integrated 6

7 MAX3880 EV Kit Bill of Materials (continued) ITEM REF_DES DNI/D NP QTY MFG PART # MFG VALUE DESCRIPTION COMMENTS 4 C5, C57 DNP 0 N/A N/A PACKAGE OUTLINE 040 NON-POLAR CAPACITOR 4 R7 DNP 0 N/A N/A PACKAGE OUTLINE 040 RESISTOR 43 L DNP WURTH ELECTRONICS INC 0.8UH INDUCTOR; SMT; SHIELDED; 0.8UH; TOL=+/-0%; 0A; for L) TOTAL 93 NOTE: DNI--> DO NOT INSTALL(PACKOUT) ; DNP--> DO NOT PROCURE Maxim Integrated 7

8 Maxim Integrated 8 MAX3880 Evaluation Kit MAX3880 EV Kit Schematic SENSE SENSE SENSE SENSE SENSE V SUPPLY SENSE 00PF.K PEC04SAAN PEC0SAAN 6800PF 0K UF UF UF UF UF UF PEC03DAAN PEC0SAAN K MAX3880HCS+ 80PF 4.7UF 0.05UF -A 0UF PEC0SAAN 0UF 50UF 5V 0UF VDD PEC0SAAN 0UF 0.05UF 0K UF VCC LP99AIM5-3.3/NOPB VB 4.7UF V8 00 VDDH VA UF 0 V8 PEC0SAAN V8 0K PEC0SAAN LP99AIM5-.8/NOPB 0 UF 3V3 PEC03DAAN 0.47UF 0 0K OE PGM UF UF UF 0.0UF -B 0 0 0K VDD VDDH PEC0SAAN SCOPE_PROBE_JACK UF 3V3 0.UF 50UF PEC0SAAN SCOPE_PROBE_JACK UF PEC0SAAN VCC VA UF K UF UF UF UF 46.4K.8K PEC0SAAN PEC0SAAN ED0/DS PEC0SAAN 0.05UF 0.0UH C38 C39 VDD C4 C9 C8 C37 R7 C40 C5 C34 C C6 C3 C0 C7 C44 C43 C30 C5 C6 J5 C33 C45 R6 R R VX C4 C36 C55 R0 C0 J9 C C C D C6 J3 C9 C J4 C5 C7 J7 R4 C54 J6 R5 C57 U3 C56 U J C5 R3 R R8 C5 J0 J5 J C9 C8 C7 C50 C49 C4 C48 C47 C53 J8 C4 J3 R4 J J4 C46 R5 C3 R C8 R7 U R6 R3 C C4 R9 L PGM STAT STAT PGM OE OE PGM E4 C3 B A4 E3 E E B3 A A B C B4 C4 D4 D3 D D C C A VDDH SENSE+ STAT OE SENSE- A PGM VDDH VCC BST VX VX VX VX VDDH BP ON/OFF VIN 3 BP ON/OFF VIN 3 + +

9 MAX3880 EV Kit PCB Layout Diagrams.0 MAX3880 EV Kit Top Silkscreen Maxim Integrated 9

10 MAX3880 EV Kit PCB Layout Diagrams (continued).0 MAX3880 EV Kit Top View Maxim Integrated 0

11 MAX3880 EV Kit PCB Layout Diagrams (continued).0 MAX3880 EV Kit Second Layer Maxim Integrated

12 MAX3880 EV Kit PCB Layout Diagrams (continued).0 MAX3880 EV Kit Third Layer Maxim Integrated

13 MAX3880 EV Kit PCB Layout Diagrams (continued).0 MAX3880 EV Kit Bottom View Maxim Integrated 3

14 MAX3880 EV Kit PCB Layout Diagrams (continued).0 MAX3880 EV Kit Bottom Silkscreen Maxim Integrated 4

15 Ordering Information MAX3880EVKIT# PART #Denotes an RoHS-compliant device TYPE EV Kit Maxim Integrated 5

16 Revision History REVISION NUMBER REVISION DATE DESCRIPTION PAGES CHANGED 0 8/7 Initial release 5/8 Updated Bill of Materials 5 7 For pricing, delivery, and ordering information, please contact Maxim Direct at , or visit Maxim Integrated s website at. Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc. 08 Maxim Integrated Products, Inc. 6