MAXIM MAX845EVKIT

19-0372; Rev 4; 10/97
MAX845 Evaluation Kit
____________________________Features
♦ Isolated Power Supply
♦ Low Profile (for PCMCIA cards)
______________Ordering Information
PART
MAX845EVKIT-MM
TEMP. RANGE
0°C to +70°C
BOARD TYPE
Surface Mount
____________________Component List
DESIGNATION QTY
DESCRIPTION
C11-C14,
C21-C24
8
0.1µF ceramic 1206 capacitors
D11, D12
2
Motorola MBR0520L Schottky diodes
D21
1
Series-connected dual Schottky diodes
Central Semiconductor CMPSH-3S
R22
1
51Ω 1206 resistor
U11, U21
2
Maxim MAX845EUA
U12
1
78L05 in surface-mount 8-pin SOIC
T11, T21
2
1:1:1 low-profile transformer
Halo TGM-010P3
Z21
1
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
PHONE
4) To evaluate shutdown, cut the trace connecting SD
to GND and connect SD to VCC.
FAX
Central
Semiconductor
(516) 435-1110
(516) 435-1824
Halo Electronics
(415) 969-7313
(415) 367-7158
Motorola
(602) 244-5303
(602) 244-4015
________________________________________________________________ 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.
Evaluates: MAX845
_______________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 µMAX package), a low-profile
transformer, a half-wave rectified voltage doubler, and
a regulator.
Evaluates: MAX845
MAX845 Evaluation Kit
ISOLATED 5V @ 100mA:
T11
HALO TGM-010P3
OFF
+5V
IN
D11
MBR0520L
8
U11
IN
GND
ON
ISO
+5V
1
U12
1
SD MAX845 D1
3
FS
6
5
N.C.
VCC
2
G1
8
7
D2
G2
4
C11
0.1µF
OUT
78L05
C12
0.1µF
ISO
GND
2 3 6 7
C13
0.1µF
C14
0.1µF
D12
MBR0520L
LOW PROFILE, ISOLATED 5V @ 40mA:
R22
T21
HALO TGM-010P3
OFF
+5V
IN
51Ω
D21A
U21
1
SD MAX845 D1
3
FS
6
5
N.C.
VCC
2
G1
8
7
D2
G2
4
C21
0.1µF
GND
ON
ISO
+5V
CMPSH-3S
SOT-23
C22
0.1µF
D21B
C24
0.1µF
C23
0.1µF
NOTE: THE TWO CIRCUITS DO NOT SHARE THE SAME GROUNDS.
Figure 1. MAX845 EV Kit Schematic
2
ISO
GND
Z21
5.1V
_______________________________________________________________________________________
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
_______________________________________________________________________________________
3
Evaluates: MAX845
MAX845 Evaluation Kit
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
© 1997 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.