Evaluates: MAX MAX17290 Evaluation Kit. General Description. Quick Start. Features. Required Equipment. Output Testing

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1 MAX790 Evaluation Kit Evaluates: MAX790 General Description The MAX790 evaluation kit (EV kit) is a fully assembled and tested PCB that contains a 6W DC-DC boost converter for battery-operated, harsh environment, front-end preboost applications. The device integrates a low-side FET driver and current-mode, control-loop circuitry for output-voltage regulation, making it ideal for boost or SEPIC converters. The device s integrated driver switches at 400kHz. The MAX790 can be synchronized with an external clock source within the 00kHz to MHz range. The EV kit operates from a DC supply voltage of 4.5V up to 7.3V. The EV kit can withstand a 6V line transient condition. The EV kit demonstrates the device features, such as dynamic adjustable output voltage, external clock synchronization, two-phase operation configurability, cycle-by-cycle current limit, hiccup mode, and thermal shutdown. The boost converter regulates 8V and can supply a current up to A. The EV kit also demonstrates a reference MAX790 design for battery-operated, harsh environment applications. Features 4.5V Up to 7.3V Input Voltage Range 93% Peak Efficiency at 5V Input 8V Up to A Output Demonstrates External Clock Synchronization Spread Spectrum Optimizes EMI Performance Demonstrates SUP UVLO Demonstrates Cycle-by-Cycle Current Limit and Hiccup Mode Thermal-Shutdown Protection PGOOD Flag Demonstrates Dynamic Adjustable Output Demonstrates Single/Two-Phase Operation Proven 4-Layer oz. PCB Layout and Thermal Design Fully Assembled and Tested Quick Start Required Equipment MAX790 EV kit 4.5V to 7.3V, 0A DC power supply Digital voltmeter (DVM) A load Output Testing This EV kit is fully assembled and tested. Follow the steps below to verify board operation. Caution: Do not turn on the power supply until all connections are completed. ) Verify that a shunt is installed on pins - of jumper JU (internal V reference enabled). ) Connect the power supply s positive terminal to the V SUP PCB banana jack and the power supply s ground to the PCB banana jack. 3) Connect the load across the V OUT and banana jacks. 4) Connect the DVM across V OUT and. 5) Turn on the power supply and set it to 4.5V. 6) Measure V OUT and verify that it is 8V. Ordering Information appears at end of data sheet ; Rev 0; 3/6

2 MAX790 Evaluation Kit Evaluates: MAX790 Detailed Description of Hardware The MAX790 EV kit is a fully assembled and tested 4-layer PCB that contains a 6W DC-DC boost converter for battery-operated, harsh environment applications, such as front-end, preboost power-suppy applications. The EV kit demonstrates the device s features, such as the integrated low-side FET driver and current-mode control-loop circuitry for output-voltage regulation. The device s integrated driver switches at 400kHz and can be synchronized with an external clock source within the 00kHz to MHz range. The EV kit operates from a DC supply voltage of 4.5V up to 7.V. The EV kit can withstand a 6V line transient, that is limited by input capacitor C4 maximum voltage or U specific pin 4V rating, which ever is less. The EV kit demonstrates the device features such as dynamic adjustable output voltage, external clock synchronization, single/two-phase operation configurability, cycle-by-cycle current limit, hiccup mode, and thermal shutdown. The boost converter regulates 8V and can supply a current up to A. Enable The EV kit features an enable input that can be used to enable/disable the device and place it in shutdown mode. The EV kit is enabled whenever power is applied to V SUP and above 4.5V and EN is pulled high. To enable the EV kit from an external enable signal, remove resistor R0 and apply a logic signal on the EN input and GND pads of the EV kit. The enable (EN) input should not be left unconnected (see Table below). Refer to the EN pin description in the MAX790 IC data sheet for additional information. See Table for EN settings. Output-Voltage Adjustment The V OUT output voltage can be dynamically adjusted by feeding an analog voltage to the REFIN pin and GND pads. The external voltage applied to REFIN is used as the FB reference. Remove the shunt on jumper JU to apply an external voltage in the range of 0.750V to.000v to REFIN. With the shunt installed on jumper JU, REFIN is shorted to and an internal V FB reference is used for loop regulation. The output voltage can be adjusted in the range of 6.00V to 5.96V. The available output current decreases down to A at 5.96V dynamically adjusted output voltage. See Table for jumper JU settings. External Clock Synchronization The MAX790 IC can be synchronized using an external clock applied to the FSET/SYNC pin and GND pads. A falling clock edge on FSET/ SYNC turns on the external MOSFET by driving DRV high after a short delay. The MAX790 can be synchronized with an external clock source within the 00kHz to MHz range, and a logic-high voltage range of.5v to 5V. Two-Phase Configuration To configure the EV kit for two-phase operation, use two EV kits and follow the instructions below: Master EV kit: ) Install a 0603 surface-mount kω resistor on the R8 pads. Slave EV kit: ) Remove resistors R and R. ) Remove capacitors C, C3, and resistor R5. 3) Install a 0603 surface-mount 0Ω resistor on R pads. Make the following connections: ) Connect the banana jack on the master to the banana jack on the slave. ) Connect the GND banana jack on the master to the GND banana jack on the slave. 3) Connect the V SUP banana jack on the master to the V SUP banana jack on the slave. 4) Connect the V OUT banana jack on the master to the V OUT banana jack on the slave. 5) Connect the COMP PCB pin on the master to the COMP pin on the slave through a BNC cable. 6) Connect the SYNCO pad on the master to the FSET/ SYNC pad on the slave. In two-phase operation, the combined master/slave 8V output is up to 4A (3W). Maxim Integrated

3 MAX790 Evaluation Kit Evaluates: MAX790 Table. Enable V SUP Pullup R0 POSITION EN PIN EV KIT OPERATION Installed* Connected to V SUP through R0 Enabled Installed Connected to GND Disabled Removed Connected to an external controller External controller enabled *Default position. Table. Output-Voltage Adjustment (JU) SHUNT POSITION REFIN PIN EV KIT OPERATION Installed* Connected to Internal V reference Not Installed Open External voltage reference *Default position. Component Suppliers Coilcraft Fairchild Semiconductor Murata Americas ON Semiconductor Panasonic Corp. Vishay SUPPLIER WEBSITE Note: Indicate that you are using the MAX790 when contacting these component suppliers. Component Information, PCB Layout, and Schematics See the following links for component information, PCB layout diagrams, and schematics. MAX790 EV BOM MAX790 EV PCB Layout MAX790 EV Schematic MAX790 EV Minimal Component Schematic Ordering Information PART MAX790EVKIT# #Denotes RoHS compliant. TYPE EV Kit Maxim Integrated 3

4 MAX790 Evaluation Kit Evaluates: MAX790 Revision History REVISION NUMBER REVISION DATE DESCRIPTION PAGES CHANGED 0 3/6 Initial release 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. 06 Maxim Integrated Products, Inc. 4

5 TITLE: Bill of Materials DATE: 03/3/06 DESIGN: max790_evkit_a NOTE: DNI > DO NOT INSTALL ; DNP > DO NOT PROCURE ITEM REF_DES DNI/D NP QTY MFG PART # MANU FACTURER VALUE DESCRIPTION C, C7 GRM3ER6C476KE5 MURATA 47UF C GRM88R7C683KA0 MURATA 0.068UF 3C3 GRM39C0G5J50V; GRM885CH5JA0 MURATA 50PF 4 C4 EEE HA470XP PANASONIC 47UF CAPACITOR; SMT (0); CERAMIC CHIP; 47UF; 6V; TOL=0%; MODEL=GRM SERIES; TG= 55 DEGC TO +85 DEGC; TC=X5R CAPACITOR; SMT (0603); CERAMIC CHIP; 0.068UF; 6V; TOL=0%; TG= 55 DEGC TO +5 DEGC; TC=X7R CAPACITOR; SMT (0603); CERAMIC CHIP; 50PF; 50V; TOL=5%; MODEL=; TG= 55 DEGC TO +5 DEGC; TC=C0G CAPACITOR; SMT (CASE_D8); ALUMINUM ELECTROLYTIC; 47UF; 50V; TOL=0%; MODEL=S SERIES; TG= 40 DEGC TO +85 DEGC 5 C5, C GRMBR7H05KA; CLB05KBFNNNE MURATA; SAMSUNG ELECTRONICS 6 C6 GRMBR7E5KA73L MURATA.UF 7C8 8 C C0603C0K5RAC; GRM88R7H0KA0; C0603X7R500 0KNE C0603C04K4RAC; GCM88R7C04KA37; C608X7RC04K; GRM88R7C04K; C0603X7R60 04KNE 9 COMP D PMEG045V50EPD NXP KEMET/MURATA/VE NKEL KEMET/MURATA/TDK /VENKEL LTD. UF 000PF 0.UF JOHNSON COMPONENTS PMEG045V5 0EPD JU PEC0SAAN SULLINS PEC0SAAN L XAL ME COILCRAFT 4.7UH CAPACITOR; SMT (0805); CERAMIC CHIP; UF; 50V; TOL=0%; TG= 55 DEGC TO +5 DEGC; TC=X7R CAPACITOR; SMT (0805); CERAMIC CHIP;.UF; 5V; TOL=0%; TG= 55 DEGC TO +5 DEGC; TC=X7R; CAPACITOR; SMT; 0603; CERAMIC; 000pF; 50V; 0%; X7R; 55degC to + 5degC; +/ 5% from 55degC to +5degC, USE 0 000p E4 FOR NEW DESIGN CAPACITOR; SMT (0603); CERAMIC CHIP; 0.UF; 6V; TOL=0%; TG= 55 DEGC TO +5 DEGC; TC=X7R; CONNECTOR; FEMALE THREADED; THROUGH HOLE; SMA; STRAIGHT THROUGH; 5PINS DIODE; SCH; SMT (SOT 89); PIV=45V; IF=5A CONNECTOR; MALE; THROUGH HOLE; BREAKAWAY; STRAIGHT; PINS INDUCTOR; SMT; SHIELDED; 4.7UH; TOL=+/ 0%; 3.6A

6 3 N FDS5670 FAIRCHILD SEMICONDUCTOR 4 R ERJ 3EKF909 PANASONIC 90.9K 5 R CRCW06033K0FK; ERJ 3EKF30V VISHAY DALE/PANASONIC FDS R3 ERJ LKFM PANASONIC R4 CRCW060300FK; ERJ 3EKF00V VISHAY DALE; PANASONIC 8 R5 RT0603FRE076K8L YAGEO PHICOMP 6.8K 9 R6, R0 CRCW FK; ERJ 3EKF003 0 R7 RC608F68 R9 CRCW ZS; MCR03EZPJ000; ERJ 3GEY0R00 TP_, TP_VOUT, TP_, TP_ K K VISHAY DALE/PANASONIC 00K SAMSUNG ELECTRONICS 68.K TRAN; 60V N CHANNEL POWERTRENCH MOSFET; NCH; NSOIC8; PD (.5W); I (0A); V (60V) RESISTOR; 0603; 90.9K OHM; %; 00PPM; 0.W; THICK FILM RESISTOR, 0603, 3KOHMS, %, 00PPM, 0.W, THICK FILM RESISTOR; 8; 0.0 OHM; %; 300PPM; 0.5W; THICK FILM RESISTOR; 0603; K; %; 00PPM; 0.0W; THICK FILM RESISTOR; 0603; 6.8K OHM; %; 50PPM; 0.W ; THIN FILM RESISTOR; 0603; 00K; %; 00PPM; 0.0W; THICK FILM RESISTOR; 0603; 68.K OHM; %; 00PPM; 0.W; THICK FILM VISHAY DALE/ROHM/PANAS RESISTOR; 0603; 0 OHM; 0%; JUMPER; 0.0W; ONIC 0 THICK FILM EMERSON NETWORK POWER CONNECTOR; MALE; PANELMOUNT; BANANA JACK; STRAIGHT; PIN 3 TP_GND 500 KEYSTONE N/A TEST POINT; PIN DIA=0.IN; TOTAL LENGTH=0.3IN; BOARD HOLE=0.04IN; BLACK; PHOSPHOR BRONZE WIRE SILVER PLATE FINISH; 4 U MAX790ETCF MAXIM MAX790ETC F EVKIT PART IC; MAX790; PACKAGE OUTLINE: 036; PACKAGE CODE: T33 4; TQFN EP 5 C9, C0 DNP 0 N/A N/A PACKAGE OUTLINE 0603 NON POLAR CAPACITOR 6 C3 DNP 0 N/A N/A PACKAGE OUTLINE 0 NON POLAR CAPACITOR EN, GND,,, VOUT,, PGOOD, REFIN, 7 SYNCO, PAD_GND, PAD_, FSET/SYNC DNP 0 MAXIMPAD N/A MAXIMPAD EVK KIT PARTS; MAXIM PAD; NO WIRE TO BE SOLDERED ON THE MAXIMPAD 8 R8, R R3 DNP 0 N/A N/A PACKAGE OUTLINE 0603 RESISTOR 9 PCB MAX790 MAXIM PCB PCB Board:MAX790 EVALUATION KIT TOTAL 3

7 Top Silkscreen

8 TOP

9 Internal

10 Internal 3

11 Bottom

12 S D G A A C FB COMP FSET/SYNC PGOOD REFIN SYNC0 ISNS DRV EN + EP GND SUP GND 4.7UH D C3 U VOUT C7 C C3 R0 R5 C R R R C0 R R6 C8 R3 R4 R9 C9 R3 N L COMP C5 C C4 GND EN PGOOD R7 FSET/SYNC SYNCO R8 C6 REFIN C JU.UF 0.UF K GND UF 47UF 0 VOUT 50PF 00K 00K 0.068UF 6.8K GND K 90.9K UF PMEG045V50EPD 47UF 47UF 3K 000PF MAX790ETCF FDS5670 PGOOD VOUT PGOOD EN EN Schematic

13 GND 0.UF UF 0 EN MAX790ETCF UF 47UF 3K 68.K.UF 90.9K 6.8K 0.068UF UH 47UF VOUT VOUT K 000PF 50PF 00K 47UF C4 C C5 R9 R U C R7 N R5 C3 C R0 C C7 R3 C8 L R4 R D C S D G EP FB COMP FSET/SYNC PGOOD REFIN SYNC0 ISNS DRV EN GND SUP A A C Minimal Component Schematic