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19-0224;Rev.3;7/00
MAX767 Evaluation Kit
________________General Description
The MAX767 evaluation kit (EV kit) is a fully assembled and tested printed circuit board for Maxim's synchronous, step-down power-supply controller. Providing a tightly regulated 3.3V output voltage from a 5V input source, the EV kit contains two separate, complete circuits with conversion efficiencies greater than 90%. The first all-surface-mount circuit can drive loads up to 1.5A, and the second circuit can drive loads up to 5A.
____________________________Features
o Fixed 3.3V Output Voltage 4% o Up to 1.5A and 5A Output Currents o 120A Standby Supply Current o 700A Quiescent Supply Current o 300kHz Switching Frequency o More than 90% Efficiency o 20-Pin Shrink-Small-Outline Package o Fully Assembled and Tested
MAX767 EV Kit
_______________Ordering Information
PART MAX767EVKIT-SO TEMP. RANGE 0C to +70C BOARD TYPE Surface Mount
________________________________________________________________________EV Kit
________________________________________________________________ Maxim Integrated Products
1
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
MAX767 Evaluation Kit MAX767 EV Kit
____________________Component List
DESIGNATION C101 C106, C206 C103, C203 C201, C202, C207 QTY 1 2 2 3 DESCRIPTION 47F, 16V low-ESR tantalum capacitor AVX TPSD476K016R0150 0.22F ceramic capacitors Murata-Erie GRM42-6X7R224K050 0.1F ceramic capacitors 220F, 10V low-ESR aluminum electrolytic capacitors Sanyo OS-CON 10SA220M 220F, 6.3V low-ESR tantalum capacitor Sprague 595D227X06R3D2B 0.01F ceramic capacitors 4.7F, 16V tantalum capacitors Sprague 595D475X0016A2B 1A, 20V Schottky (1N5817) NIEC EC10QS02 Motorola MBRS120T3 3A, 20V Schottky (1N5820) NIEC NSQ03A02 Motorola MBRS340T3 SOT-23 diodes Central Semiconductor CMPSH-3 10H, 1.5A inductor Sumida CDR74B-100 3.3H, 5A inductor CoilCraft DO3316-332 N-channel MOSFET (SO-8) Motorola MMDF3N03HD or Siliconix Si9936DY N-channel MOSFETs (DPAK) Motorola MTD20N03HDL or Harris RFD16N05L 0.040, 1% resistor (SMT) IRC LR2010-01-R040-F DD WSL-2010-R040F 10 resistors 0.012, 1% resistor (SMT) DD WSL-2512-R012F 0.025, 1% resistor (SMT) IRC LR2010-01-R025-F MAX767CAP ICs 3-pin header Shunt PC board MAX767 data sheet
______________Component Suppliers
SUPPLIER AVX Central Semiconductor Coilcraft Coiltronics DD Harris IRC Motorola Murata-Erie NIEC (QMI*) Sanyo USA Siliconix Sprague Sumida * Distributor PHONE 803-946-0690 800-282-4975 516-435-1110 847-639-6400 561-241-7876 402-564-3131 407-727-9100 800-442-7747 512-992-7900 602-303-5454 800-831-9172 814-237-1431 805-867-2555 619-661-6835 408-988-8000 603-224-1961 847-956-0666 FAX 803 626-3123 516-435-1824 847-639-1469 561-241-9339 402-563-6418 407-724-3973 512-992-3377 602-994-6430 814-238-0490 805-867-2698 619-661-1055 408-970-3950 603-224-1430 847-956-0702
C102 C105, C205 C104, C204 D102
1 2 2 1
D202 D101, D201 L101 L201 N101
1 2 1 1 1
N201, N202
2
R101 R102, R202 R201 (2 options) U1, U2 JU101, JU201 None None None
1 2 1 2 2 2 2 1 1
2
_______________________________________________________________________________________
MAX767 Evaluation Kit
_______________Operating Procedure
The MAX767 EV kit is a fully assembled and tested board. The following procedure verifies board operation for both 1.5A and 5A configurations. Do not turn on the power supply until all connections are completed. 1. Connect a 5V supply to the pad marked VIN. The ground connects to the GND pad. 2. Connect a voltmeter and load (if any) to the VOUT pad. 3. Place the shunt on JU101 and JU201 across pins 2 and 3 for normal operation. 4. Turn on the power and verify that the output voltage is 3.3V.
Jumper Selection
The 3-pin header JU101/JU201 selects shutdown mode. Table 1 lists the selectable jumper options.
MAX767 EV Kit
Output Noise
MAX767 output noise is typically less than 50mV peakto-peak. Small erroneous voltage spikes seen when the MOSFETs switch are the result of improper oscilloscope-probe grounding. EMI radiated from the circuit is picked up by the loop from the probe tip to the probe ground. Ground noise may also cause a measurement error due to the voltage difference from the output capacitor ground lead to the probe ground connection. To reduce or eliminate these errors, use the oscilloscope-probe grounding technique shown in Figure 1. The probe is placed directly across the output capacitor, with its ground ring contacting the ground lead of the output capacitor. The normal probe ground lead is not connected to the circuit.
Table 1. Jumper JU101/JU201 Functions
JUMPER CONNECTION 1&2 JU101/ JU201 2&3 OPEN FUNCTION Output disabled; VOUT = 0V Output enabled; VOUT = 3.3V Output enabled if pin 3 (ON) is connected to VCC; disabled if ON is connected to GND.
PROBE TIP TOUCHES OUTPUT CAPACITOR POSITIVE
PROBE GROUND RING TOUCHES OUTPUT CAPACITOR GROUND
DISCONNECT NORMAL GROUND LEAD
Figure 1. Noise Measurement _______________________________________________________________________________________ 3
MAX767 Evaluation Kit MAX767 EV Kit
R102 10 10 14 15 VCC BST 3 JU101 1 2 2 3 D101 CMPSH-3 C103 0.1F DH SS C101 4.7F 16V VIN 4.5V TO 5.5V J2
3.3V_ON J1
C104 4.7F
17
ON
U1
19
18 1 20
N101A L101 10H R101 0.040 VOUT 3.3V J3 C102 220F 6.3V N101B
MAX767
LX CS
9 8 C106 0.22F
SYNC REF
FB
DL 16
D102 1N5817
GND J4
GND 4 5
PGND 13
C105 0.01F
6 7 11
Figure 2. MAX767 1.5A Circuit
R202 10
VIN 4.5V TO 5.5V J6 D201 CMPSH-3 C203 0.1F C201 220F 10V
N201
3.3V_ON J5 3 JU201 1 2
C204 4.7F
10 14 15 VCC BST
17
3 2
ON SS
U2 MAX767
DH 19 LX CS 18 1 20
L201 3.3H
R201 0.012
VOUT 3.3V J7 C202 220F 10V
9 8 C206 0.22F
SYNC REF
FB
DL
16
N202
D202 1N5820
C207 220F 10V
GND J8
GND 4 5
PGND 13
C205 0.01F
6 7 11
Figure 3. MAX767 5A Circuit
4
_______________________________________________________________________________________
MAX767 Evaluation Kit MAX767 EV Kit
Figure 4. MAX767 EV Kit Component Placement Guide (Component Side)
Figure 5. MAX767 EV Kit PC Layout (Component Side)
_______________________________________________________________________________________
5
MAX767 Evaluation Kit MAX767 EV Kit
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.
6 ___________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 (c) 2000 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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