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MAX831 Evaluation Kit Evaluates: MAX830-MAX833
_______________General Description
The MAX831 evaluation kit (EV kit) provides a regulated 5.0V output voltage while operating on input voltages from 8.0V to 30V. It drives loads up to 1A with conversion efficiency greater than 80%. The MAX831 EV kit is a fully assembled and tested surface-mount printed circuit board. This kit comes with a 5V-output MAX831 IC, but it can also be used to evaluate the MAX833 (3.0V output), MAX832 (3.3V output), or MAX830 (adjustable output). Additional pads are provided on the board's solder side to accommodate the external feedback resistors used with the MAX830.
____________________________Features
o 8V to 30V Input Voltage Range o 5V Output Voltage o Up to 1A Continuous Output Current o 140A Shutdown Supply Current o 8mA Quiescent Current o Internal Power Switch o Adjustable Current Limit o Surface-Mount Construction
____________________Component List
DESIGNATION C1, C2 QTY 2 DESCRIPTION 33F, 35V, low-ESR tantalum capacitor Sprague 595D336X0035R2B 220F, 10V, low-ESR tantalum capacitor Sprague 595D227X0010R2B or AVX TPSE227M010R0100 0.047F ceramic capacitor Open 10k, 5% resistor 3A, 40V 1N5822 (SMT) Schottky diode Nihon NSQ03A04 Motorola MBRS340T3 100H, 1.3A inductor Coilcraft D03316-104 Maxim MAX831CWE 2-pin header Shunt MAX831 PC board MAX831 data sheet
o Fully Assembled and Tested
______________Ordering Information
PART MAX831EVKIT-SO TEMP. RANGE 0C to +70C PIN-PACKAGE Surface Mount
C3, C4 C5 R1, R2, R3 R4
2 1 0 1
______________Component Suppliers
SUPPLIER AVX Coilcraft IRC Motorola Murata-Erie Nihon Sprague PHONE (207) 282-5111 (708) 639-6400 (704) 264-8861 (602) 244-3576 (814) 237-1431 (805) 867-2555 (603) 224-1961 FAX (207) 283-1941 (708) 639-1469 (704) 264-1972 (602) 244-4015 (814) 238-0480 (805) 867-2556 (603) 224-1430
D1
1
L1 U1 J1 None None None
1 1 1 1 1 1
1 Maxim Integrated Products _______________________________________________________________
Call toll free 1-800-998-8800 for free samples or literature.
MAX831 Evaluation Kit
___________________Quick Reference
The MAX831 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 an 8V to 30V 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) Remove the shunt on J1 for normal operation. 4) Turn on the power and verify that the output voltage is 5.0V. Instructions for modifying the board for different output voltages appear in the sections Evaluating the MAX832 and MAX833 and Other Output Voltages.
Table 1. Jumper J1 Functions
SHUNT LOCATION OFF ON --- ---- SHDN PIN Floating Connected to GND MAX831 OUTPUT MAX831 Enabled, VOUT = 5.0V Shutdown Mode, VOUT = 0V
Evaluates: MAX830-MAX833
Notes about Inductor Selection
The 100H Coilcraft D03316-104 inductor that comes mounted with the EV kit has low resistance and a medium current rating (1.3A). It provides excellent performance over the line and load ranges of the MAX830/MAX831/MAX832/MAX833. For additional information on inductor selection, refer to the MAX830-MAX833 data sheet.
_______________Detailed Description
Jumper Selection
The two-pin header J1 selects the shutdown mode. Table 1 lists the jumper selectable options.
Evaluating the MAX832 and MAX833
The MAX831 can be replaced by a MAX833 to generate a 3.0V output voltage with output current up to 1A, or by a MAX832 to generate a 3.3V output voltage with output current up to 1A. The only modification required is to replace the IC.
1 VIN +8V to +30V C1 33F 35V C2 33F 35V 2 3 4 5 R3 OPEN 6 7 R2 OPEN 8
VIN VIN
VSW VSW
16 15 14 13 12 11 10 9 J1 SHDN R4 10k C5 0.047F D1 1N5822
L1 100H
VOUT +5V C3 220F 10V C4 220F 10V
U1
VIN VSW
MAX831
VIN GND ILIM GND SENSE VSW GND VC GND SHUT
R1 0
GND
Figure 1. MAX831 EV Kit Schematic Diagram
_______________________________________________________________________________________
2
MAX831 Evaluation Kit Evaluates: MAX830-MAX833
Other Output Voltages
The MAX831 can be replaced with a MAX830 to generate output voltages in the 2.5V to 25V range using external resistors. Besides replacing the IC, the only other modifications required are to cut the trace shorting resistor R1, add the output-voltage-divider resistors R1 and R2 (located on the board's solder side), and use low-ESR output capacitors with the proper voltage rating. The Pin Description section of the MAX830-MAX833 data sheet gives instructions for calculating the values of external feedback resistors R1 and R2.
Reducing Current Limit
To reduce the output current to below 1A, or to reduce the peak current limit to below 1.3A, install the currentlimiting resistor, R3, onto the board's solder side. See Note 7 in the MAX830-MAX833 data sheet for instructions on selecting the resistor value.
BOARD DIAGRAM DRAWN TO REDUCED SCALE.
BOARD DIAGRAM DRAWN TO REDUCED SCALE.
Figure 2. MAX831 EV Kit Component Placement Guide-- Component Side
Figure 3. MAX831 EV Kit Component Placement Guide-- Solder Side
BOARD DIAGRAM DRAWN TO REDUCED SCALE.
BOARD DIAGRAM DRAWN TO REDUCED SCALE.
Figure 4. PC Board Layout--Component Side
Figure 5. 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.
3 ___________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 (c) 1995 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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