MAX8506EVKIT [MAXIM]
1MHz Fixed-Frequency PWM Switching;
| 型号： | MAX8506EVKIT |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | 1MHz Fixed-Frequency PWM Switching |
| 文件： | 总5页 (文件大小：104K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-3228; Rev 0; 2/04
MAX8506 Evaluation Kit
General Description
Features
♦ 2.6V to 5.5V Input Voltage Range
♦ 1MHz Fixed-Frequency PWM Switching
♦ 600mA Output Current
The MAX8506 evaluation kit (EV kit) is a fully assembled
and tested surface-mount circuit board that demon-
strates the MAX8506 1MHz pulse-width-modulated
(PWM) step-down DC-DC converter optimized for pow-
ering the power amplifier (PA) in wireless applications.
The EV kit can dynamically control the output voltage in
the 0.4V to VIN range from a 2.6V to 5.5V input. It can
deliver 600mA of load current. The MAX8506 EV kit can
also be used to evaluate the MAX8507, which has a dif-
ferent gain, and the MAX8508, whose output can be
externally programmed for fixed 0.75V to 3.4V.
♦ Adjustable Output Voltages
1.76 x REFIN (MAX8506)
2 x REFIN (MAX8507)
Set by External Feedback Resistors (MAX8508)
♦ Low 0.1µA (typ) Quiescent Current in Shutdown
Mode
♦ Surface-Mount Construction
♦ Fully Assembled and Tested
Ordering Information
PART
TEMP RANGE IC PACKAGE
MAX8506EVKIT
0°C to +70°C 16 Thin QFN (4mm x 4mm)
Note: To evaluate the other devices, MAX8507/MAX8508, order
a MAX8507ETE/MAX8508ETE free sample with the
MAX8506EVKIT.
Component List
DESIGNATION
QTY
DESCRIPTION
DESIGNATION
QTY
DESCRIPTION
100pF 5ꢀ, 50V C0G ceramic
capacitor (0402)
Murata GꢁP1555C1H101J
TDK C1005C0G1H101J
2.2µF 10ꢀ, 6.3V X5ꢁ ceramic
capacitor (0603)
Taiyo Yuden JMK107BJ225K
TDK C1608X5ꢁ0J225K
C6
1
C1
1
4.7µH inductor
Sumida CDꢁH2D18/HP-4ꢁ7NC
TOKO1001AS-4ꢁ7M
4.7µF 10ꢀ, 6.3V X5ꢁ ceramic
capacitor (0603)
TDK C1608X5ꢁ0J475K
L1
1
C2
C3
1
1
0.22µF 20ꢀ, 16V X5ꢁ ceramic
capacitor (0603)
Taiyo Yuden EMK107BJ224MA
TDK C1608X7ꢁ1C224M
ꢁ1
ꢁ2
1
0
10kΩ 5ꢀ resistor (0603)
Not installed, resistor (0402)
MAX8506ETE
(16-pin thin QFN 4mm x 4mm)
U1
1
1500pF 10ꢀ, 50V X7ꢁ ceramic
capacitor (0603)
Murata GꢁM188ꢁ71H152K
TDK C1608X7ꢁ1H152K
JU1, JU2, JU3
None
3
3
1
3-pin headers
Shunts
C4
C5
1
1
0.1µF 10ꢀ, 10V X5ꢁ ceramic
capacitor (0402)
Taiyo Yuden LMK105BJ104KV
TDK C1005X5ꢁ1A104K
None
MAX8506 PC board
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
MAX8506 Evaluation Kit
Component Suppliers
SUPPLIER
PHONE
FAX
WEBSITE
Murata
Sumida
770-436-1300
847-545-6700
800-348-2496
847-803-6100
847-297-0070
770-436-3030
847-545-6720
847-925-0899
847-390-4405
847-699-1194
www.murata.com
www.sumida.com
www.t-yuden.com
www.component.tdk.com
www.tokoam.com
Taiyo Yuden
TDK
TOKO
Note: Please indicate that you are using the MAX8506/MAX8507/MAX8508 when contacting these component suppliers.
jumpers that enable the user to configure the shutdown,
SKIP/PWM, and high-power (HP) bypass modes.
Quick Start
The MAX8506 EV kit is a fully assembled and tested
surface-mount board. Follow the steps below for board
operation. Do not turn on the power supply until all
connections are completed:
Shutdown Mode
The EV kit contains jumper JU1 to allow the user to
switch the MAX8506 converter from enable to shutdown
mode. Shutdown mode reduces the supply current to
0.1µA (typ) and sets the output voltage to 0V. See
Table 1 for JU1 configurations.
1) Verify that a shunt is connected across pins 1 and 2
of jumper JU1 (output enabled).
2) Verify that a shunt is connected across pins 2 and 3
of jumper JU2 (high-power bypass mode disabled).
High-Power Bypass Mode
Jumper JU2 allows the user to enable or disable the
high-power bypass mode of the MAX8506 converter.
When the high-power mode is enabled, the converter
stops regulating the output voltage and the output volt-
3) Verify that a shunt is connected across pins 1 and 2
of jumper JU3 (PWM mode enabled).
4) Connect a voltmeter across the VOUT and the GND
pads to monitor the output voltage.
age, VOUT is equal to the input voltage, VIN When the
,
.
5) Connect a 2.6V to 5.5V power supply to the VIN
pad. Connect the power-supply ground terminal to
the GND pad.
high-power mode is disabled, the converter regulates
the output voltage to the programmed voltage. See
Table 2 for JU2 configuration. ꢁemoving the shunt on
jumper JU2 and applying a CMOS logic-level signal to
the HP pad on the EV kit board can also control the
high-power bypass mode.
6) Connect a 1V power supply to the ꢁEFIN pad.
Connect the power-supply ground terminal to the
GND pad.
7) Turn on the power supplies and verify that the out-
put voltage is 1.76V.
Skip/PWM Mode
Installing a shunt across pins 2 and 3 of jumper JU3
enables skip-mode operation. This allows automatic
PWM control at medium and heavy current loads, and
skip mode at light current loads to improve efficiency
and reduce quiescent current. Installing a shunt across
pins 1 and 2 of JU3 enables forced-PWM operation.
Forced-PWM operation is desirable in sensitive ꢁF and
data-acquisition applications to ensure that switching
harmonics do not interfere with sensitive IF and data-
Detailed Description
The MAX8506 EV kit circuit board demonstrates the
MAX8506 1MHz, PWM, step-down DC-DC converter
circuit that is optimized to power the PA in wireless
applications. The EV kit requires a power supply in the
2.6V to 5.5V range, and has an output voltage dynami-
cally controlled by ꢁEFIN. The EV kit board features
Table 1. Jumper JU1 (SHDN)
SHUNT LOCATION
Pins 1 and 2
SHDN PIN
Connected to VIN
Connected to GND
MAX8506 OUTPUT
Output enabled, VOUT = 1.76 x ꢁEFIN
Shutdown, VOUT = 0V
Pins 2 and 3
Output controlled by the user (user-supplied control signal must be
connected to SHDN pad)
None
Connected to SHDN pad
2
_______________________________________________________________________________________
MAX8506 Evaluation Kit
Table 2. Jumper JU2 (HP)
SHUNT LOCATION
HP PIN
EV KIT OPERATION
High-power bypass mode enabled, VOUT = VIN
High-power bypass mode disabled
Pins 1 and 2
Pins 2 and 3
Connected to VIN
Connected to GND
Output controlled by the user (user-supplied control signal must be
connected to HP pad)
None
Connected to HP pad
Table 3. Jumper JU3 (SKIP)
SHUNT LOCATION
Pins 1 and 2
SKIP PIN
OPERATION MODE
PWM mode at all loads
Connected to VIN
Connected to GND
Pins 2 and 3
SKIP mode at light loads and PWM mode at medium and heavy loads
Operation mode controlled by the user (user-supplied control signal
must be connected to SKIP pad)
None
Connected to SKIP pad
sampling frequencies. Forced-PWM operation uses
higher supply current with no load compared to skip
mode. See Table 3 for JU3 configuration.
To evaluate the MAX8508 with the MAX8506 EV kit,
replace the MAX8506ETE with the MAX8508ETE,
remove C5, and then install feedback resistors on ꢁ2
and C5 pads. Change ꢁ1 to 5.62kΩ and C4 to 2700pF.
Evaluating the MAX8507/MAX8508
The MAX8506 EV kit circuit board comes with the
MAX8506 converter installed. The MAX8506 EV kit
board can also be used to evaluate the MAX8507/
MAX8508 converters. To evaluate the MAX8507 with
the MAX8506 EV kit, replace the MAX8506ETE with the
MAX8507ETE, and change ꢁ1 to 15kΩ and C4 to
1000pF.
The output voltage, VOUT can be adjusted in the 0.75V
,
to 3.4V range. Select a feedback resistor, ꢁ
,
Feedback
between 5kΩ and 50kΩ and install on the C5 pads. ꢁ2
is determined by the following equation:
ꢁ2 = ꢁ
(VOUT / V – 1)
FB
Feedback
where V
voltage.
= 0.75V and VOUT is the desired output
FB
Care should be taken when soldering or desoldering
the exposed paddle under the IC.
_______________________________________________________________________________________
3
MAX8506 Evaluation Kit
VIN
VIN
10
9
BATTP
LX
11
BATT
C1
2.2µF
6.3V
13
15
L1
4.7µH
BATT
BATT
GND
VOUT
8
7
12
14
PGND
N.C.
OUT
OUT
C2
4.7µF
6.3V
U1
VIN
GND
R2
OPEN
MAX8506
1
SHDN
HP
2
1
6
SHDN
HP
REFIN
JU1
3
VIN
4
2
REFIN
GND
1
3
C5
0.1µF
2
GND
JU2
VIN
1
3
SKIP
2
16
3
SKIP
REF
R1
10kΩ
JU3
5
COMP
C3
0.22µF
C6
100pF
C4
1500pF
Figure 1. MAX8506 EV Kit Schematic
4
_______________________________________________________________________________________
MAX8506 Evaluation Kit
Figure 2. MAX8506 EV Kit Component Placement Guide—
Component Side
Figure 3. MAX8506 EV Kit PC Board Layout—Component Side
Figure 4. MAX8506 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.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 5
© 2004 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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