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19-3409; Rev 0; 9/04
MAX5065 Evaluation Kit
General Description
The MAX5065 evaluation kit (EV kit) provides a +1.3V adjustable output voltage from a +12V input source. It delivers up to 10A of output current with a switching frequency of 250kHz per phase and achieves efficiencies up to 85%. The MAX5065 dual-phase, PWM controller provides high-output-current capability in a compact package with a minimum number of external components. The MAX5065 utilizes a dual-phase, average current-mode control that enables optimal use of low R DS(ON) MOSFETs, eliminating the need for external heatsinks even when delivering high output currents. Differential sensing enables accurate control of the output voltage, while adaptive voltage positioning provides optimum transient response. An internal regulator enables operation with input voltage ranges of +4.5V to +5.5V or +8V to +28V. The high switching frequency and dualphase operation allow the use of low-output inductor values and input capacitor values. This accommodates the use of PC-board-embedded planar magnetics achieving superior reliability, current sharing, thermal management, compact size, and low system cost. The MAX5065 also features a clock input (CLKIN) for synchronization to an external clock, and a clock output (CLKOUT) with programmable phase delay (relative to CLKIN/DH) for paralleling multiple phases. The MAX5065 also limits the reverse current if the bus voltage becomes higher than the regulated output voltage. This device is specifically designed to limit current sinking when multiple power-supply modules are paralleled. The MAX5065 offers an adjustable +0.6V to +3.3V output voltage. 10A Output Current 250kHz Switching Frequency/Phase Up to 85% Efficiency +10V to +14V Input Voltage VOUT Set to +1.3V (Adjustable from +0.6V to +3.3V)
Features
Evaluates: MAX5065
Component List
DESIGNATION QTY DESCRIPTION 1F 10%, 16V X7R ceramic capacitor (0805) Kemet C0805C105K4RAC Murata GRM21BR71C105K 0.1F 10%, 10V X5R ceramic capacitors (0402) Kemet C0402C104K8PAC Murata GRP155R61A104K 470pF 10%, 50V X7R ceramic capacitor (0402) Kemet C0402C471K5RAC Murata GRP155R71H471K 100pF 5%, 50V C0G ceramic capacitors (0402) Kemet C0402C101J5GAC Murata GRP1555C1H101J 4700pF 10%, 50V X7R ceramic capacitor (0402) Kemet C0402C472K5RAC Murata GRP155R71H472K 0.01F 10%, 25V X7R ceramic capacitors (0402) Kemet C0402C103K3RAC Murata GRP155R71E103K 4.7F 20%, 6.3V X5R ceramic capacitor (0603) Murata GRM188R60J475K 330F 20%, 2.5V, 9m POSCAP Sanyo 2R5TPE330M9 1000pF 10%, 50V X7R ceramic capacitor (0402) Kemet C0402C102K5RAC Murata GRP155R71H102K
C1
1
C2, C3, C13
3
C4
1
C5, C6
2
C7
1
Ordering Information
PART MAX5065EVKIT TEMP RANGE 0C to +70C* IC PACKAGE 28 SSOP C8, C9 2
*+70C operation requires 200LFM airflow.
C10
1
C11
1
C12
1
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
MAX5065 Evaluation Kit Evaluates: MAX5065
Component List (continued)
DESIGNATION QTY DESCRIPTION 0.1F 10%, 25V X7R ceramic capacitor (0603) Kemet C0603C104K3RAC Murata GRM188R71E104K 10F 20%, 16V X5R ceramic capacitor (1206) Kemet C1206C106M4PAC Murata GRM31CR61C106M 0.2A, 30V SOT-323 dual Schottky diode, common anode Central Semiconductor CMSSH-3A Diodes Inc. BAT54AW 1A, 30V, SOD-123 Schottky diodes Diodes Inc. 1N5819HW Toshiba CRS01 5-pin header, single row, right angle 6-pin header, 0.1in center 1H, 8A inductors TOKO FDV0630-1R0M 30V, 20A, 4m, 8-pin SO, n-channel MOSFETs International Rectifier IRF7832 DESIGNATION N3, N4 QTY 2 DESCRIPTION 30V, 13.6A, 9.1m, 8-pin SO, n-channel MOSFETs International Rectifier IRF7821 0.007 1%, 0.5W current-sense resistors (2010) IRC LRC-LRF2010-01-R007-F Vishay Dale WSL2010 0.007 1.0% 97.6k 1% resistor (0402) 5.62k 1% resistor (0402) 4.99k 1% resistor (0402) 7.5k 5% resistor (0402) 1.8k 5% resistors (0402) 25.5k 1% resistor (0402) 4.02k 1% resistor (0402) Not installed, resistors (0603) 10 5% resistor (0402) 10k 5% resistor (0603) MAX5065EAI, 28-pin SSOP
C14
1
R1, R2
2
C15
1
R3 R4 R5 R6 R7, R8 R9 R10 R11, R12 R13 R14 U1
1 1 1 1 2 1 1 0 1 1 1
D1
1
D2, D3 J1 J2 L1, L2
1 1 1 2
N1, N2
2
Component Suppliers
SUPPLIER Central Semiconductor Diodes Inc. International Resistive Co. (IRC) Kemet Murata Sanyo TOKO Toshiba Vishay Dale PHONE 631-435-1110 805-446-4800 361-992-7900 864-963-6300 770-436-1300 619-661-6835 847-297-0070 949-455-2000 402-564-3131 FAX 631-435-1824 805-446-4850 361-992-3377 864-963-6322 770-436-3030 619-661-1055 847-699-1194 949-859-3963 402-563-6296 WEBSITE www.centralsemi.com www.diodes.com www.irctt.com www.kemet.com www.murata.com www.sanyovideo.com www.tokoam.com www.toshiba.com/taec www.vishay.com
Note: Indicate you are using the MAX5065 when contacting these manufacturers.
2
_______________________________________________________________________________________
MAX5065 Evaluation Kit
Quick Start
Recommended Equipment
* * * DC power source capable of supplying 2A at +12V Voltmeter Load when the +12V input source powers on. To control enable with an external signal generator, connect the external signal generator to ENABLE (pin 6 of J2 on the MAX5065 EV kit). A logic low shuts down the power drivers.
Evaluates: MAX5065
Output Voltage
The MAX5065 EV kit provides a +1.3V output voltage. Change the output voltage to a value between +0.6V and +2.5V by changing the resistor-divider R4/R5. Note: The output voltage is programmable up to +3.3V; however the output capacitor must be replaced with a higher voltage-rating capacitor. Use the following equation to set the no-load output voltage: VOUT(NOLOAD) R3 R4 = R5 x - 1 0.6V R3 + R10 where R3 = 97.6k and R10 = 4.02k. Use 1% resistors between 1k and 10k for R5.
Procedure
The MAX5065 EV kit is a fully assembled and tested surface-mount board. Follow the steps below to verify board operation. Do not turn on the power supply until all connections are completed: 1) Connect the DC power source to the VIN and GND pins of the MAX5065 EV kit. The pin diagram is shown in Figure 1. 2) Connect the load to the VOUT and GND pins. 3) Connect the voltmeter across VOUT and GND. 4) Turn on the power supply. 5) Verify the voltage at VOUT is +1.3V.
Detailed Description
The MAX5065 EV kit provides a +1.3V adjustable output voltage from a +12V input source. It delivers up to 10A of output current.
Table 1. MAX5065 EV Kit Pinout
CONNECTOR PIN 1 2 J1 3 4 5 1 2 J2 3 4 5 6 NAME VOUT VOUT Remote Sense VOUT PGND PGND VIN VIN N.C. N.C. EN DESCRIPTION Voltage output Voltage output High-side, remote voltage-sense input Voltage output Power ground Power ground Voltage input Voltage input No connection No connection Enable
Remote Voltage Sensing
For high currents, there can be significant voltage drop across the wires connecting the MAX5065 EV kit to the load. To compensate for this voltage drop, the MAX5065 EV kit includes a remote sense pin that allows the voltage to be sensed at the load. To use this feature, connect a wire from remote sense (pin 3 of J1 on the MAX5065 EV kit) to the positive side of the load.
Enable
EN (pin 15 on the MAX5065) is internally pulled up to VCC with 5A of current. This allows the MAX5065 to power on
Figure 1. MAX5065 EV Kit Pinout _______________________________________________________________________________________ 3
Evaluates: MAX5065
MAX5065 Evaluation Kit
Figure 2. MAX5065 EV Kit Schematic
1 CSP2 CLKIN CLKOUT BST2 VIN 4 1 24 5 6 N1 1 22 VIN 7 SENSE+ 8 SENSE9 SENSEVCC C13 0.1F L 1 C10 4.7F DIFF 20 3 10 R BST2 R13 10 C11 330F 4 BST1 18 17 16 15 EN EN R14 10k BST1 C3 0.1F 5 6 4 1 1 3 2 N2 8 7 3 14 CSN1 DH1 BST1 CSP1 13 2 N4 R12 SHORT (PC TRACE) VCC 5 6 7 8 VIN D2 L1 1H R1 0.007 1% R4 5.62k 1% SENSE+ SENSE+ VCC 2 D1 C14 0.1F BST1 CLP1 IN 21 REMOTESENSE SENSE23 D3 7 5 CLP2 23 4 8 L2 1H 23 R2 0.007 1% N3 J2-2 J2-3 J2-4 J2-5 EN J2-6 DH2 25 C2 0.1F 26 R11 SHORT (PC TRACE) 6 7 BST2 5 8 27 VIN J2 SIP 6 PIN J2-1 CSN2 PHASE PLLCMP 28 2 VCC 3 4 LX2
4
U1 MAX5065
6 SGND PGND DL2 J1 SIP 6 PIN J1-1 J1-2 J1-3 J1-4 J1-5 REMOTESENSE 11 EAN DL1 19 R3 97.6k 1% 12 EAOUT LX1 R5 4.99k 1% SENSE-
VIN
C1 1F
C15 10F
C7 R6 7.5k 4700pF
C4 470pF
C8 R7 1.8k 0.01F
C5 100pF
C9 R8 0.01F 1.8k
C6 100pF
R10 4.02k 1%
_______________________________________________________________________________________
C12 1000pF
R9 25.5k 1%
MAX5065 Evaluation Kit Evaluates: MAX5065
Figure 3. MAX5065 EV Kit Component Placement Guide--Top Layer
Figure 4. MAX5065 EV Kit PC Board Layout--Top Layer
Figure 5. MAX5065 EV Kit PC Board Layout--Signal (Layer 2)
Figure 6. MAX5065 EV Kit PC Board Layout--GND, PGND, and VOUT (Layer 3)
Figure 7. MAX5065 EV Kit PC Board Layout--Bottom Layer
Figure 8. MAX5065 EV Kit Component Placement Guide-- Bottom Layer
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 5 (c) 2004 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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