MAX1701EVKIT [MAXIM]
Evaluation Kit for the MAX1700/MAX1701 ; 评估板MAX1700 / MAX1701\n
| 型号： | MAX1701EVKIT |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Evaluation Kit for the MAX1700/MAX1701
|
| 文件： | 总4页 (文件大小：87K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-4759; Rev 1; 1/99
MAX1 7 0 1 Eva lu a t io n Kit
Evluates:/MAX701
________________Ge n e ra l De s c rip t io n
____________________________Fe a t u re s
♦ 3.3V Output
The MAX1701 evaluation kit provides a regulated 3.3V
output while operating on input voltages as low as 0.7V.
The input may be a DC source or a 1 to 2–cell battery.
Efficiency is up to 95% with output loads up to 200mA.
♦ 200mA Output
♦ 0.7V to 3.5V Input
The kit, which uses surface-mount components, is fully
assembled and tested for quick evaluation. Jumpers
are provided to select the output voltage, switching
mode, and shutdown control. This EV kit can also be
used to evaluate the MAX1700. Simply order a free
s a mp le of the MAX1700EEE a nd re p la c e the
MAX1701EEE that comes installed on the board.
♦ Up to 95% Efficiency
♦ 3µA Shutdown Current
♦ 300kHz PWM Operation
♦ Optional Low-Power PFM Mode
♦ Small Surface-Mount Components
_______________Ord e rin g In fo rm a t io n
____________________Co m p o n e n t Lis t
DESIGNATION QTY
DESCRIPTION
PART
TEMP. RANGE
PIN-PACKAGE
MAX1701EVKIT
0°C to +70°C
16-pin QSOP
22µF, 25V, low-ESR tantalum capacitor
AVX TPSD226M025R0200
C1
1
Sprague 593D226X0025D
C2, C3
C4
2
1
0.22µF, 25V ceramic capacitors
0.10µF, 25V ceramic capacitor
______________Co m p o n e n t S u p p lie rs
SUPPLIER
AVX
PHONE
FAX
100µF, 10V low-ESR tantalum capaci-
tor AVX TPSD107M010R0100 or
Sprague 593D107X0010D7
(803) 946-0690
(847) 639-6400
(561) 241-7876
(603) 224-1961
(847) 956-0666
(303) 675-2140
(803) 626-3123
(847) 639-1469
(561) 241-9339
(603) 224-1430
(847) 956-0702
(303) 675-2150
C5
1
Coilcraft
Coiltronics
Sprague
Sumida
Not installed. Space for optional user
capacitor.
C6, C7
D1
0
1
0.5A, 20V Schottky diode
Motorola MBR0520L
Motorola
J1, J2, J3
J4, J5
3
2
3-pin jumpers
2-pin jumpers
10µH, 1.6A power inductor
CoilCraft DO3316-103,
Coiltronics UP1B-100,
Sumida CDR74B-100
_________________________Qu ic k S t a rt
L1
1
The MAX1701 EV kit is shipped fully assembled and
tested. Follow these steps to verify board operation. Do
not turn on the power supply until all connections
are completed.
R1, R4, R6
R2, R3, R5
R7, R8, R9
R10, R11, R12
R13
3
3
3
3
1
1
5
1
1
100kΩ, 1% resistors
Not installed
1) Verify that the shunts are connected as listed in
Table 2 for a 3.3V output.
100kΩ, 5% resistors
1MΩ, 5% resistors
10Ω, 5% resistor
2) Connect a +1.1V to +3.3V supply to the pad marked
VIN. The ground connects to the GND pad. Note:
the input voltage may drop as low as 0.7V after start-
up.
U1
MAX1701EEE
None
Shunts
3) Connect a voltmeter to the VOUT pad.
None
3.4” x 2.4” printed circuit board
MAX1700/MAX1701 data sheet
4) Turn on the power and verify that the output voltage
is 3.3V.
None
5) Connect a load (if any).
________________________________________________________________ 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.
MAX1 7 0 1 Eva lu a t io n Kit
Co m p o n e n t S e le c t io n
The final circuit performance is determined by the qual-
ity of the components surrounding the MAX1701. The
power inductor must not saturate at the 1.6A maximum
peak current produced by MAX1701. Inductors in the
Component List all have high current ratings and low
coil resistance.
_______________De t a ile d De s c rip t io n
J u m p e r S e le c t io n
Five jumpers on the printed circuit board allow user
selection of several configurations. Table 1 lists the
jumpers and their functions. Table 2 lists the jumper
positions when the board is set for normal 3.3V output
operation.
Table 1. Jumper Functions
SHUNT
LOCATION
PIN
CONNECTION
JUMPER
MAX1701 OPERATION
1 and 2
2 and 3
ONA connected to GND
ONA connected to VOUT
MAX1701 is disabled if ONB is VOUT.
MAX1701 is enabled.
J1
ONA must be driven by a signal connected
to the ONA pad.
Open
ONA is not controlled by the board
1 and 2
2 and 3
MAX1701 is enabled.
ONB connected to GND
ONB connected to VOUT
MAX1701 is disabled if ONA = GND.
J2
J3
ONB must be driven by a signal connected
to the ONB pad.
Open
ONB is not controlled by the board
CLK/SEL connected to GND
CLK/SEL connected to VOUT
Low-power mode, MAX1701 operates in
the PFM mode.
1 and 2
2 and 3
High-power mode, MAX1701 operates in
the PWM mode.
CLK/SEL pin can be driven by an external
source to select power mode, or a 200kHz
to 400kHz signal to control switching fre-
quency.
Open
CLK/SEL connected to CLK/SEL pad
Evluates:/MAX701
Shorted
Open
FB connected to GND
VOUT is preset to 3.3V.
J4
J5
Resistors must be installed in R3 and R4 for
proper circuit operation.
FB connected to the resistor divider
Shorted for normal operation
Pull-ups disconnected
Shorted
Open
VOUT connected to pull-up resistors.
R7–R9 are disconnected so that MAX1701
shutdown current may be verified.
Table 2. Jumper Position for Normal 3.3V Operation
SHUNT
LOCATION
PIN
JUMPER
MAX1701 OPERATION
CONNECTION
J1
J2
2 and 3
1 and 2
ONA connected to VOUT
MAX1701 is enabled.
MAX1701 is enabled.
ONB connected to GND
High-power mode, MAX1701 operates in
the PWM mode.
J3
2 and 3
CLK/SEL connected to VOUT
VOUT is preset to 3.3V. This jumper must
be shorted or resistors installed in R3 and
R4 for proper circuit operation.
J4
J5
Shorted
Shorted
FB connected to GND
VOUT connected to pull-up resistors
2
_______________________________________________________________________________________
MAX1 7 0 1 Eva lu a t io n Kit
Evluates:/MAX701
The input and output capacitors must have low equiva-
lent series resistance (ESR) to handle the high peak
currents found in switching regulators. Low ESR is
especially critical in low-voltage circuits to reduce the
AC voltage across the capacitors. A higher ESR on the
outp ut c a p a c itor will inc re a s e the outp ut rip p le .
Consider using parallel capacitors to reduce the total
ESR if the application requires lower output ripple. An
additional output capacitor (C6) may be required for
output current greater than 200mA or output voltages
less than 3.3V.
nected between LX and P
as close to the IC as
OUT
possible. A Schottky diode is specified for the lower for-
ward voltage drop as well as the fast switching charac-
teristic. Most Schottky diodes with a sufficient current
rating will work. The diode for the evaluation board was
selected for its small size.
A separate low-noise ground plane connects pin 5 to
the re fe re nc e a nd s ig na l g round s . This low-nois e
ground plane is then connected to the power-ground
plane at the PGND pin (Figure 4).
A low-ESR input capacitor must be located physically
close to the inductor. The Schottky diode must be con-
VIN 0.7V TO 3.5V
C1
22µF
25V
GND
R2
OPEN
L1
10µH
VOUT
D1
13
1
LBP
LX
POUT
OUT
C5
100µF
10V
C6
OPEN
R1
100k
1%
15
14
2
3
LBN
REF
R13
10
C2
0.22µF
J5
C4
0.1µF
U1
C3
0.22µF
R3
OPEN
MAX1701
11
VOUT
ONA
FB
J4
C7
OPEN
R4
100k
1%
R7
100k
R8
100k
R9
100k
R11
1M
3
J1
8
2
1
AO
ONA
ONB
9
AO
LBO
POK
AIN
LO BATT
3
2
16
6
ONB
J2
7
4
PWR 0K
AIN
1
3
2
CLK/SEL
J3
10
CLK/SEL
R5
OPEN
1
R10
1M
R12
1M
R6
100k
1%
GND
5
PGND
12
Figure 1. MAX1701 EV Kit Schematic
_______________________________________________________________________________________
3
MAX1 7 0 1 Eva lu a t io n Kit
1.0"
1.0"
Figure 2. MAX1701 EV Kit Component Placement Guide
Figure 3. MAX1701 EV Kit PC Board Layout—Component Side
Evluates:/MAX701
1.0"
Figure 4. MAX1701 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
© 1999 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
相关型号：
MAX17021GTL+T
Switching Regulator/Controller, Current-mode, 800kHz Switching Freq-Max, BICMOS, PQCC40,
MAXIM
©2020 ICPDF网 联系我们和版权申明