MAX629EVKIT [MAXIM]
Evaluation Kit for the MAX629 ; 评估板MAX629\n
| 型号： | MAX629EVKIT |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Evaluation Kit for the MAX629
|
| 文件： | 总4页 (文件大小：57K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MAX6 2 9 Eva lu a t io n Kit
Evluates:MAX629
_______________Ge n e ra l De s c rip t io n
____________________________Fe a t u re s
The MAX629 evaluation kit (EV kit) contains two sepa-
rate switching-regulator circuits. The first circuit con-
♦ Output Voltage:
+24V Positive
verts a +0.8V to V
battery voltage to a +24V LCD
OUT
-20V Negative
backplane bias voltage for currents up to 20mA. The
second circuit converts a +0.8V to +12V battery voltage
to a -20V voltage for currents up to 20mA. The MAX629
re q uire s a +2.7V to +5.5V s up p ly a t VCC, b ut the
inductor can be powered from as low as 0.8V. Both out-
put voltages can be adjusted by changing the feed -
back-resistor values.
♦ Battery Input Voltage:
+0.8V to V
(Positive Output)
OUT
+0.8V to +15V (Negative Output)
♦ +2.7V to +5.5V V Supply Range
CC
♦ Up to 20mA Output Current
♦ Internal 28V N-Channel Switch
♦ 1µA (Max) IC Shutdown Current
♦ Up to 300kHz Switching Frequency
♦ Surface-Mount Components
♦ Fully Assembled and Tested
The MAX629 EV kit provides low quiescent current and
high efficiency for maximum battery life. Operation up
to 300kHz allows the use of a tiny surface-mount induc-
tor. This EV kit is a fully assembled and tested surface-
mount circuit board.
____________________Co m p o n e n t Lis t
DESIGNATION QTY
DESCRIPTION
10µF, 35V tantalum capacitors
AVX TPSD106M035R0300 or
Sprague 593D106X0035D2W
C1, C2, C10,
______________Ord e rin g In fo rm a t io n
4
C11
PART
TEMP. RANGE
BOARD TYPE
C3, C4, C8, C9
C5, C6
4
2
0.1µF ceramic capacitors
150pF ceramic capacitors
MAX629EVKIT
0°C to +70°C
Surface Mount
2.2µF ceramic capacitor
Marcon/United Chemi-Con
THCR30E1225Z
C7
1
______________Co m p o n e n t S u p p lie rs
40V, 0.5A Schottky diodes
Motorola MBR0540LT3
D1, D2, D3
JU1–JU4
L1, L2
3
4
2
SUPPLIER*
AVX
PHONE
FAX
3-pin headers
(803) 946-0690
(847) 639-6400
(561) 241-7876
(402) 564-3131
(803) 626-3123
(847) 639-1469
(561) 241-9339
(402) 563-6418
47µH inductors
Sumida CD54-470
Coilcraft
Coiltronics
Dale-Vishay
R1, R3
R2
2
1
1
1
2
4
1
576kΩ, 1% resistors
31.6kΩ, 1% resistor
35.7kΩ, 1% resistor
2Ω, 5% resistor
MAX629ESA (SO-8)
Shunts
Marcon/United
Chemi-Con
(847) 696-2000
(847) 696-9278
R4
R5
Motorola
(602) 303-5454
(603) 224-1961
(847) 956-0666
(203) 268-6261
(602) 994-6430
(603) 224-1430
(847) 956-0702
(203) 452-5670
U1, U2
None
None
Sprague
Sumida
MAX629 PC board
Vishay/Vitramon
* Please indicate that you are using the MAX629 when contact-
ing these suppliers.
________________________________________________________________ Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
MAX6 2 9 Eva lu a t io n Kit
S h u t d o w n Mo d e
The MAX629 EV kit features a shutdown mode that
reduces quiescent current to less than 1µA to preserve
battery life. The two-pin header JU1 selects shutdown
mode for the positive output, and JU3 selects shut-
down mode for the negative output. Tables 1 and 2 list
the selectable jumper options.
_________________________Qu ic k S t a rt
The MAX629 EV kit is fully a s s e mb le d a nd te s te d .
Follow these steps to verify board operation. V
and
CC
V
BATT
are separated on each circuit to demonstrate
operation of V
down to 0.8V. V
and V
can
BATT
CC
BATT
be connected together and to a single supply from
2.7V to 5.5V. Do not turn on the power supply until
all connections are completed.
Cu rre n t Lim it
The two-pin header JU2 selects the current limit for the
positive output, and JU4 selects the current limit for the
negative output. Table 3 lists the selectable jumper
options. The MAX629 EV kit comes configured for a
500mA current limit.
Positive Output:
1) Connect a +2.7V to +5.5V supply to the VCC pad,
and a +0.8V to V
supply to the VBATT pad.
OUT
Connect the grounds to the GND pad.
2) Connect a voltmeter and load, if any, to the VOUT
pad.
Table 1. Jumper JU1 Functions
(Positive Output)
3) Place the shunt on JU1 across pins 2 and 3.
4) Turn on the power supplies and verify that the out-
put voltage is +24V.
SHUNT
LOCATION
Evluates:MAX629
MAX629 OUTPUT
SHDN PIN
Negative Output:
1) Connect a +2.7V to +5.5V supply to the VCC pad,
and a +0.8V to +15V supply to the VBATT pad.
Connect the grounds to the GND pad.
Shutdown mode,
1 and 2
Connected to GND
Connected to VCC
V
OUT
= V
- V
BATT DIODE
MAX629 enabled,
= +24V
2) Connect a voltmeter and load, if any, to the VOUT
pad.
2 and 3
V
OUT
3) Place the shunt on JU3 across pins 2 and 3.
4) Turn on the power supplies and verify that the output
voltage is -20V.
Table 2. Jumper JU3 Functions
(Negative Output)
For othe r outp ut volta g e s , re fe r to the Se tting the
Output Voltage section in the MAX629 data sheet for
instructions on selecting the feedback resistors.
SHUNT
MAX629 OUTPUT
SHDN PIN
LOCATION
_______________De t a ile d De s c rip t io n
Shutdown mode,
The MAX629 EV kit contains two separate switching-
regulator circuits. The first circuit provides a +24V out-
put for currents up to 20mA with 87% typical conver-
sion efficiency. The second circuit provides a -20V out-
put voltage for currents up to 20mA with 82% typical
conversion efficiency. Both output voltages can be
adjusted by changing the feedback-resistor values.
1 and 2
Connected to GND
Connected to VCC
V
OUT
= 0V
MAX629 enabled,
= -20V
2 and 3
V
OUT
Table 3. Jumper JU2 and JU4 Functions
SHUNT
LOCATION
CURRENT LIMIT
(mA)
ISET PIN
1 and 2
2 and 3
Connected to GND
Connected to VCC
250
500
2
_______________________________________________________________________________________
MAX6 2 9 Eva lu a t io n Kit
Evluates:MAX629
VBATT
+0.8V TO V
OUT
V
CC
C1
2.7V TO 5.5V
10µF
35V
C3
0.1µF
V
2
1
8
7
CC
POL
V
CC
L1
47µH
D1
3
1
MBR0540L
JU1
VOUT
+24V
SHDN
SHDN
LX
2
C2
10µF
35V
R1
576k
1%
U1
C5
V
CC
150pF
MAX629
3
1
JU2
5
6
4
3
ISET
GND
FB
2
R2
31.6k
1%
REF
REF
(1.25V)
C4
0.1µF
Figure 1a. MAX629 EV Kit Schematic (Positive Output Voltage)
VBATT
+0.8V TO +15V
V
CC
C8
0.1µF
C10
10µF
35V
2.7V TO 5.5V
2
1
8
7
POL
V
CC
L2
47µH
D2
MBR0540L
VOUT
-20V
3
1
JU3
SHDN
SHDN
LX
2
R5
2Ω
C7
2.2µF
R3
576k
1%
C6
150pF
C11
10µF
35V
D3
MBR0540L
U1
V
CC
MAX629
3
JU4
5
6
4
3
ISET
GND
FB
2
1
REF
(1.25V)
R4
35.7k
1%
REF
C9
0.1µF
Figure 1b. MAX629 EV Kit Schematic (Negative Output Voltage)
_______________________________________________________________________________________
3
MAX6 2 9 Eva lu a t io n Kit
1.0"
Figure 2. MAX629 EV Kit Component Placement Guide—Component Side
Evluates:MAX629
1.0"
Figure 3. MAX629 EV Kit PC Board Layout—Component Side
1.0"
Figure 4. MAX629 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.
4
___________________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
© 1997 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
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