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19-2685; Rev 0; 12/02
MAX1966 Evaluation Kit
General Description
The MAX1966 evaluation kit (EV kit) is a fully assembled and tested circuit board that contains two independent step-down DC-to-DC converter circuits. The MAX1966 circuit is optimized for a 3V to 5.5V input range and delivers 1.8V at 2A. The MAX1967 circuit is optimized for a 4.9V to 20V input range and delivers 2.5V at 2A. Refer to the MAX1966/MAX1967 data sheet for component selection for higher current applications. o Lowest Cost Solution o Up to 96% Efficiency o Evaluates MAX1966/MAX1967 o 3V to 5.5V Input Range (MAX1966 Circuit) 1.8V at 2A Output o 4.9V to 20V Input Range (MAX1967 Circuit) 2.5V at 2A Output o Fully Assembled and Tested
Features
Evaluates: MAX1966/MAX1967
Ordering Information
PART MAX1966EVKIT TEMP RANGE 0C to +70C PIN-PACKAGE 8 SO/10 MAX
Component List
DESIGNATION QTY C1, C8, C9, C16 4 DESCRIPTION 0.1F 20%, 50V X7R ceramic capacitors (0805) Taiyo Yuden UMK212BJ104MG 330F 20%, 35V aluminum electrolytic capacitors (10 x 20) Sanyo 35MV330AX Not installed capacitors (10 x 16) 820F 20%, 10V aluminum electrolytic capacitors (10 x 16) Sanyo 10MV820AX 1F 20%, 10V X7R ceramic capacitors (0805) Taiyo Yuden LMK212BJ105MG 3300pF 20%, 50V X7R ceramic capacitor (0603) Taiyo Yuden UMK107B332MZ 0.01F 20%, 50V X7R ceramic capacitor (0603) Taiyo Yuden UMK107B103MZ 2.2F 20%, 10V X5R ceramic capacitor (0805) Taiyo Yuden LMK212BJ225MG 1F 10%, 25V, X7R ceramic capacitor (0805) TDK C2012X7R1E105K N1, N2 R1 R2, R5 R3 R4 R6 R7, R8 R9-R12 U1 U2 None 2 1 2 1 1 1 0 4 1 1 1 DESIGNATION QTY D1, D2 D3, D4 C2, C10 C3, C11 C4, C5, C12, C13 2 0 4 2 2 DESCRIPTION 100mA, 30V Schottky diodes SOT23 Central Semiconductor CMPSH-3 100mA, 30V Schottky diodes SOT323 Central Semiconductor CMSSH-3 22H, 2.5A inductors Coilcraft TV1415-B or Transpower Technologies, Inc. LCI-1 3.5A, 30V dual N-channel MOSFETs, 8-pin SO Fairchild Semiconductor FDS6961A 1.24k 1% resistor (0805) 1k 1% resistors (0805) 182k 1% resistor (0805) 2.10k 1% resistor (0805) 75k 1% resistor (0805) Not installed resistors (0805) 10 1% resistors (0603) MAX1966ESA, 8-pin SO MAX1967EUB, 10-pin MAX MAX1966 PC board
L1, L2
2
C6, C14, C18
3
C7
1
C15
1
C17
1
C19
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.
MAX1966 Evaluation Kit Evaluates: MAX1966/MAX1967
Component Suppliers
SUPPLIER Central Semiconductor Coilcraft Fairchild Semiconductor Sanyo Taiyo Yuden TDK Transpower Technologies, Inc. PHONE 631-435-1110 847-639-6400 888-522-5372 619-661-6322 800-348-2496 847-803-6100 775-852-0140 FAX 631-435-1824 847-639-1469 972-910-8036 619-661-1055 847-925-0899 847-390-4405 775-852-0145 WEBSITE www.centralsemi.com www.coilcraft.com www.fairchildsemi.com www.sanyovideo.com www.t-yuden.com www.component.tdk.com www.trans-power.com
Note: Please indicate that you are using the MAX1966 when contacting these component suppliers.
Quick Start
The MAX1966 EV kit is fully assembled and tested. Follow these steps to verify board operation. Do not turn on the power supply until all connections are completed.
Detailed Description
The MAX1966 EV kit contains two step-down DC-DC converters. One of the circuits uses a MAX1966, an 8pin SO step-down controller. The other circuit uses a MAX1967, a 10-pin MAX step-down controller. Both evaluation circuits are designed to achieve the lowest component cost. The MAX1966 evaluation circuit has a 3V to 5.5V input range. The output is configured for 1.8V that can supply up to 2A. The MAX1967 evaluation circuit has a higher input range of 4.9V to 20V. The output is configured for 2.5V and can supply up to 2A. Both circuits have extra pads for additional input capacitors to reduce input ripple current. The switching frequencies for both the MAX1966/ MAX1967 are internally set at 100kHz. The circuits use a feedback voltage of 0.8V and offer efficiencies up to 96%.
Required Equipment
The following equipment is required before beginning: * 20V, 2ADC power supply * One voltmeter
VOUT1 (MAX1966)
1) Connect a voltmeter to the VOUT1 pad. 2) Connect a 3VDC to 5.5VDC power supply to the VIN1 pad, with the voltage set to 0V. 3) Connect the supply ground to the GND pad near VIN1. 4) Turn on the power supply and gradually increase the input voltage through the 3V to 5.5V range. 5) Verify that VOUT1 is 1.8V throughout the 3V to 5.5V input voltage range.
Other Output Voltages
The MAX1966 EV kit comes preset to 1.8V on VOUT1, and 2.5V on VOUT2. To set other output voltages, refer to the MAX1966/MAX1967 data sheet for external component selection.
VOUT2 (MAX1967)
1) Connect a voltmeter to the VOUT2 pad. 2) Connect a 4.9VDC to 20VDC power supply to the VIN2 pad, with the voltage set to 0V. 3) Connect the supply ground to the GND pad near VIN2. 4) Turn on the power supply and gradually increase the input voltage through the 4.9V to 20V range. 5) Verify that VOUT2 is 2.5V throughout the 4.9V to 20V input voltage range.
2
_______________________________________________________________________________________
MAX1966 Evaluation Kit Evaluates: MAX1966/MAX1967
VIN1 3V-5.5V C18 1F BST C2 330F 35V
D1 4 C1 0.1F R11 10 1% 5 4 6 VIN BST 1
C3 OPEN
GND
DH U1 D3
8
N1-B 3
MAX1966
2 COMP LX 7 C8 0.1F
BST L1 22H C4 820F 10V C5 820F 10V VOUT1 1.8V AT 2A
C7 3300pF
R3 182k 1% 6 5
R12 10 1%
7 2
C6 1.0F GND
8 N1-A 1
GND
DL
FB
3 R2 1k 1% R1 1.24k 1%
Figure 1. MAX1966 EV Kit Schematic (Evaluating MAX1966)
_______________________________________________________________________________________
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MAX1966 Evaluation Kit Evaluates: MAX1966/MAX1967
VIN2 4.9V TO 20V 4 C9 0.1F 5 R7 SHORT (PC TRACE) VCC BST U2 D4 3 10 R9 10 1% BST2 5 4 6 N2-B 3 BST2 1 C15 0.01F R6 75k 1% COMP LX 8 C16 0.1F R8 SHORT (PC TRACE) 6 R10 10 1% R5 1k 1% R4 2.10k 1% 2 L2 22H C12 820F 10V C13 820F 10V VOUT2 2.5V AT 2A C17 2.2F D2 C19 1F C10 330F 35V
VIN
VL
C11 OPEN
GND
MAX1967
DH
9
7
C14 1.0F GND
8 N2-A 1
DL
7
GND FB
2
Figure 2. MAX1966 EV Kit Schematic (Evaluating MAX1967)
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MAX1966 Evaluation Kit Evaluates: MAX1966/MAX1967
Figure 3. MAX1966 EV Kit Component Placement Guide-- Component Side
Figure 4. MAX1966 EV Kit PC Board Layout--Component Side
Figure 5. MAX1966 EV Kit PC Board Layout--Solder Side
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) 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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