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19-0372; Rev 4; 10/97
MAX845 Evaluation Kit
_______________General Description
The MAX845 evaluation kit (EV kit) is an assembled and tested isolated 5V power supply that meets PCMCIA height requirements. Two demonstration circuits are provided: a 100mA circuit that uses an industry-standard 78L05 regulator, and a 40mA circuit that uses a low-cost zener shunt regulator. Both circuits consist of a MAX845 IC (in the MAX package), a low-profile transformer, a half-wave rectified voltage doubler, and a regulator.
____________________________Features
o Isolated Power Supply o Low Profile (for PCMCIA cards)
Evaluates: MAX845
______________Ordering Information
PART MAX845EVKIT-MM TEMP. RANGE 0C to +70C BOARD TYPE Surface Mount
____________________Component List
DESIGNATION QTY C11-C14, C21-C24 D11, D12 D21 R22 U11, U21 U12 T11, T21 Z21 8 2 1 1 2 1 2 1 DESCRIPTION 0.1F ceramic 1206 capacitors Motorola MBR0520L Schottky diodes Series-connected dual Schottky diodes Central Semiconductor CMPSH-3S 51 1206 resistor Maxim MAX845EUA 78L05 in surface-mount 8-pin SOIC 1:1:1 low-profile transformer Halo TGM-010P3 5.1V, 5% zener in SOT-23 Central Semiconductor CMPZ5231B
_________________________Quick Start
The MAX845 EV kit is fully assembled and tested. Follow the steps below to verify board operation. Do not turn on the power supply until all connections are completed. The circuit on the top half of the board can provide up to 100mA. The circuit on the lower half of the board can provide up to 40mA. 1) Connect a 4.5V to 5.5V supply to the pad marked +5V IN. The power-supply ground return connects to the GND pad. 2) Connect a voltmeter and load (if any) to the +5OUT pad. The load ground return connects to the ISO GND pad. 3) Turn on the power and verify that the output is 5V 5%.
______________Component Suppliers
SUPPLIER Central Semiconductor Halo Electronics Motorola PHONE (516) 435-1110 (415) 969-7313 (602) 244-5303 FAX (516) 435-1824 (415) 367-7158 (602) 244-4015
4) To evaluate shutdown, cut the trace connecting SD to GND and connect SD to VCC.
________________________________________________________________ Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 408-737-7600 ext. 3468.
MAX845 Evaluation Kit Evaluates: MAX845
ISOLATED 5V @ 100mA: T11 HALO TGM-010P3 D11 MBR0520L
+5V IN
OFF
8
U11
C11 0.1F 1 SD MAX845 D1 3 FS 6 5 N.C. VCC 2 G1 8 7 D2 G2 4 C12 0.1F
IN
OUT
1
ISO +5V
U12
78L05 ISO GND C14 0.1F
GND
ON
2367 C13 0.1F D12 MBR0520L
LOW PROFILE, ISOLATED 5V @ 40mA: T21 HALO TGM-010P3
R22 51 D21A C22 0.1F D21B
ISO +5V
+5V IN
OFF
U21
C21 0.1F 1 SD MAX845 D1 3 FS 6 5 N.C. VCC 2 G1 8 7 D2 G2 4 ON CMPSH-3S SOT-23
Z21 5.1V C24 0.1F
ISO GND
GND
C23 0.1F
NOTE: THE TWO CIRCUITS DO NOT SHARE THE SAME GROUNDS.
Figure 1. MAX845 EV Kit Schematic
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_______________________________________________________________________________________
MAX845 Evaluation Kit Evaluates: MAX845
Figure 2. MAX845 EV Kit Component Placement Guide-- Component Side
Figure 3. MAX845 EV Kit PC Board Layout--Component Side
Figure 4. MAX845 EV Kit PC Board Layout--Solder Side
_______________________________________________________________________________________
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MAX845 Evaluation Kit Evaluates: MAX845
NOTES
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.
4 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 1997 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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