MAX618EVKIT [MAXIM]
Evaluation Kit for the MAX618 ; 评估板MAX618\n
| 型号： | MAX618EVKIT |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Evaluation Kit for the MAX618
|
| 文件： | 总6页 (文件大小：82K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-1462; Rev 0; 6/99
MAX6 1 8 Eva lu a t io n Kit
Evluates:MAX618
Ge n e ra l De s c rip t io n
Fe a t u re s
The MAX618 evaluation kit (EV kit) is a constant-fre-
q ue nc y, PWM, s te p -up s witc hing re g ula tor with a n
internal 2A, 28V n-channel MOSFET. The EV kit accepts
♦ +3V to V
Input Voltage Range
OUT
♦ 12V or Adjustable Output Voltage
♦ Up to 500mA Output Current
♦ Internal 2A, 28V MOSFET Switch
♦ 3µA Shutdown Current
a +3V to V
input and converts it to a 12V output for
OUT
currents up to 500mA. Conversion efficiency is greater
than 90%. The EV kit operates at 250kHz, allowing the
use of small external components.
♦ 250kHz Switching Frequency
♦ Surface-Mount Components
♦ Fully Assembled and Tested
The MAX618 EV kit is a fully assembled and tested sur-
face-mount circuit board.
Co m p o n e n t Lis t
Ord e rin g In fo rm a t io n
DESIGNATION QTY
DESCRIPTION
PART
TEMP. RANGE
IC PACKAGE
MAX618EVKIT
0°C to +70°C
16 QSOP
68µF, 20V low-ESR tantalum caps
AVX TPSE686M020R0150 or
Sprague 593D686X0020E2W
C1, C2
2
_________________________Qu ic k S t a rt
The MAX618 EV kit is fully a s s e mb le d a nd te s te d .
Follow these steps to verify board operation. Do not
turn on the power supply until all connections are
completed.
C3
C4
1
1
1
2
1
0.1µF ceramic capacitor
4.7µF, 10V X5R ceramic capacitor
Taiyo Yuden LMK316BJ475ML
C5
0.047µF ceramic capacitor
1) Conne c t a +5V sup ply to the VIN pa d. Conne c t
ground to the GND pad.
1µF, 25V X5R ceramic capacitors
Taiyo Yuden TMK316BJ105KL
C6, C7
C8
2) Connect a voltmeter and load, if any, to the VOUT
pad.
68pF ceramic capacitor
3) Place the shunt across JU1 pins 2 and 3.
2A Schottky diode
SGS-Thomson STPS2L25U,
Nihon EC21QS03L, or
4) Turn on the power supply to the board and verify
that the output voltage is 12V.
D1
L1
1
1
Central Semiconductor CMSH2-40M
5) For othe r outp ut volta g e s , re fe r to the Outp ut
Voltage Selection section in the MAX618 data sheet
for instructions on selecting feedback resistors R1
and R2, inductor L1, output capacitor C2, and com-
pensation capacitors C5 and C8. Note: Input (C1)
and output (C2) capacitors are rated at 20V.
15µH power inductor
Sumida CDRH6D38-150 (shielded),
Sumida CR75-150 (unshielded), or
Sumida CDH74-150 (unshielded)
R1
R2
1
1
1
1
1
1
1
715kΩ ±1% resistor
100kΩ ±1% resistor
MAX618EEE
J u m p e r S e le c t io n
The 3-pin header JU1 selects shutdown mode. Table 1
lists the selectable jumper options in shutdown mode.
U1
JU1
None
None
None
3-pin header
Table 1. Jumper JU1 Shutdown Function
Shunt
SHUNT
LOCATION
MAX618 OUTPUT
SHDN PIN
MAX618 PC board
MAX618 data sheet
Connected to
GND
Shutdown mode,
1 & 2
V
= V - V
OUT
IN DIODE
Connected to
VL
MAX618 enabled,
= 12V
2 & 3
V
OUT
________________________________________________________________ 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 1-800-835-8769.
MAX6 1 8 Eva lu a t io n Kit
VIN
C1
68µF
20V
C3
L1
15µH
C7
0.1µF
1µF
25V
10
IN
1
3
D1
2
3
4
5
VOUT
+12V
2
SHDN
VL
LX
LX
LX
SHDN
VL
JU1
C6
1µF
25V
C2
68µF
20V
MAX618
11
13
14
15
PGND
PGND
PGND
C4
4.7µF
10V
R1
715k
1%
6
7
Evluates:MAX618
COMP
FB
GND
C5
0.047µF
R2
100k
1%
1, 8, 9, 12, 16
C8
68pF
NOTE: HEAVY LINES INDICATE HIGH-CURRENT PATHS.
Figure 1. MAX618 EV Kit Schematic
2
_______________________________________________________________________________________
MAX6 1 8 Eva lu a t io n Kit
Evluates:MAX618
1.0"
Figure 2. MAX618 EV Kit—Component Placement Guide
1.0"
Figure 3. MAX618 EV Kit PC Board Layout—Component Side
1.0"
Figure 4. MAX618 EV Kit PC Board Layout—Solder Side
_______________________________________________________________________________________
3
MAX6 1 8 Eva lu a t io n Kit
NOTES
Evluates:MAX618
4
_______________________________________________________________________________________
MAX6 1 8 Eva lu a t io n Kit
Evluates:MAX618
NOTES
_______________________________________________________________________________________
5
MAX6 1 8 Eva lu a t io n Kit
NOTES
Evluates:MAX618
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 _____________________Ma x im In t e g ra t e d P ro d u c t s , 1 2 0 S a n Ga b rie l Drive , S u n n yva le , CA 9 4 0 8 6 4 0 8 -7 3 7 -7 6 0 0
© 1999 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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