MAX1556EVKIT [MAXIM]
MAX1556 Evaluation Kit; MAX1556评估套件
| 型号： | MAX1556EVKIT |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | MAX1556 Evaluation Kit |
| 文件： | 总6页 (文件大小：510K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-3415; Rev 0; 9/04
MAX1556 Evaluation Kit
General Description
Features
♦ Up to 97% Efficiency
The MAX1556 evaluation kit (EV kit) is a fully assembled
and tested circuit board that evaluates the MAX1556
and MAX1557 PWM step-down DC-DC converters. The
circuit operates from 2.6V to 5.5V. The MAX1556 deliv-
ers up to 1.2A and has pin-selectable 1.8V, 2.5V, 3.3V,
and adjustable output. The MAX1557 delivers up to
600mA and has pin-selectable 1V, 1.3V, 1.5V, and
adjustable output. Each circuit features an on-board
shutdown control.
♦ 95% Efficiency at 1mA Load Current
♦ 1MHz PWM Switching Frequency
♦ Tiny Inductors
♦ Pin-Selectable Output Voltages
MAX1556: 3.3V, 2.5V, 1.8V, and Adjustable
MAX1557: 1.5V, 1.3V, 1.0V, and Adjustable
♦ 1.2A Guaranteed Output Current (MAX1556)
Component List
♦ Voltage Positioning Optimizes Load-Transient
DESIGNATION QTY
DESCRIPTION
Response
10µF 10%, 6.3V X5R ceramic
capacitors (0805)
Murata GRM21BR60J106K or
equivalent
♦ Low 16µA Quiescent Current
C1, C6
2
♦ Low 27µA Quiescent Current in Dropout
♦ Low 0.1µA Shutdown Current
22µF 10%, 6.3V X5R ceramic
capacitors (1206)
Murata GRM31CR60J226K or
equivalent
♦ Analog Soft-Start with Zero Overshoot Current
♦ Small, 10-Pin, 3mm x 3mm TDFN Package
♦ Fully Assembled and Tested
C2, C7
C3, C8
C4, C9
C5, C10
C11
2
0
2
0
1
Not installed, capacitors (0805)
0.001µF 10%, 50V X7R ceramic
capacitors (0402)
Murata GRP155R71H102K or
equivalent
Ordering Information
PART
TEMP RANGE
IC PACKAGE
MAX1556EVKIT
0°C to +70°C
10 TDFN-EP*
Not installed, capacitors (0603)
*EP = Exposed paddle.
0.47µF 10%, 6.3V X5R ceramic
capacitor (0402)
Murata GRM155R60J474K or
equivalent
Component Suppliers
JU1–JU6
L1
6
1
3-pin headers
SUPPLIER
Murata
PHONE
WEBSITE
3.3µH inductor, 0.036Ω, 1.3A,
5.0mm x 5.0mm x 2.0mm
Taiyo Yuden LMNP04SB3R3N
814-237-1431
408-573-4150
402-563-6866
www.murata.com
www.t-yuden.com
www.vishay.com
Taiyo Yuden
Vishay
4.7µH inductor, 0.05Ω, 1.2A, 5.0mm
x 5.0mm x 2.0mm
Taiyo Yuden LMNP04SB4R7N
Note: Indicate that you are using the MAX1556 when contacting
these component suppliers.
L2
1
0
Shorted on PC board, resistors
(0603)
R1, R3
Quick Start
R2, R4
R5
0
1
1
1
6
1
Not installed, resistors (0603)
100Ω 1% resistor (0402)
MAX1556ETB
Recommended Equipment
•
•
One variable DC power supply capable of supply-
ing up to 5.5V at 1.2A
U1
U2
MAX1557ETB
One voltmeter (DMM)
None
None
Shunts, position 2
MAX1556 EV kit 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.
MAX1556 Evaluation Kit
5) Turn on the power supply and verify the output volt-
age is the desired voltage from setting JU4, JU5,
and JU6 (default is 1.0V).
Procedure (MAX1556ETB)
The MAX1556 EV kit is fully assembled and tested.
Follow the steps below to verify board operation:
1) Select the desired output voltage with JU1, JU2,
and JU3 (see Table 1). The EV kit is preset to a
1.8V output.
Detailed Description
The MAX1556 EV kit contains two separate PWM step-
down DC-DC converter circuits. Either circuit can be
powered from a DC power supply with a 2.6V to 5.5V
input range. The top and bottom circuit are separate from
each other and do not share a common ground plane.
2) Connect the positive terminal of the voltmeter to the
pad labeled OUT. Connect the ground terminal of
the voltmeter to the pad labeled GND nearest the
OUT pad. Connect a load from OUT to the GND
pad closest to OUT.
The top circuit (MAX1556) provides pin-selectable out-
put voltages of 3.3V, 2.5V, 1.8V, and adjustable at 1.2A.
3) Preset the power supply to between 2.6V and 5.5V,
and turn the power supply off. Do not turn on the
power supply until all connections are completed.
The bottom circuit (MAX1557) provides pin-selectable
output voltages of 1.5V, 1.3V, 1.0V, and adjustable at
600mA.
4) Connect the positive power-supply terminal to the
pad labeled IN. Connect the power-supply ground
to the pad labeled GND nearest the IN pad.
Pin-Selectable Output Voltages
The MAX1556 output voltage is selected with JU1 and
JU2, as shown in Table 1.
5) Turn on the power supply and verify the output volt-
age is the desired voltage from setting JU1, JU2,
and JU3 (default is 1.8V).
The MAX1557 output voltage is selected with JU4 and
JU5, as shown in Table 2.
Procedure (MAX1557ETB)
The MAX1556 EV kit is fully assembled and tested.
Follow the steps below to verify board operation:
Evaluating Other Output Voltages
The MAX1556 EV kit comes with the MAX1556 preset to
a 1.8V output and the MAX1557 preset to a 1V output.
To evaluate other voltages besides the preset values,
set the MAX1556 (or MAX1557) to adjustable mode.
The footprints for the feedback resistors are available
on the backside of the evaluation kit. Refer to the
Adjusting the Output Voltage section in the MAX1556
data sheet for a detailed description on calculating
these feedback resistor values for the desired output
voltage. Resistor R1 for the MAX1556 circuit (R3 on
MAX1557) is shorted on the evaluation kit. This short
must be cut prior to the placement of a resistor on the
footprint. Resistor R2 for the MAX1556 circuit (R4 for
MAX1557) is open and requires no modification before
placing a resistor on the footprint.
1) Select the desired output voltage with JU4, JU5,
and JU6 (see Table 2). The EV kit is preset to a
1.0V output.
2) Connect the positive terminal of the voltmeter to the
pad labeled OUT2. Connect the ground terminal of
the voltmeter to the pad labeled GND2 nearest the
OUT2 pad. Connect a load from OUT2 to the GND2
pad closest to OUT2.
3) Preset the power supply to between 2.6V and 5.5V,
and turn the power supply off. Do not turn on the
power supply until all connections are completed.
4) Connect the positive power-supply terminal to the
pad labeled IN2. Connect the power-supply ground
to the pad labeled GND2 nearest the IN2 pad.
Table 1. Output Voltage Selection (MAX1556ETB)
JU1
JU2
JU3
MAX1556 V
1.8V
OUT
1 and 2
1 and 2
2 and 3
2 and 3
—
1 and 2
2 and 3
1 and 2
2 and 3
—
1 and 2
1 and 2
1 and 2
1 and 2
2 and 3
2.5V
3.3V
ADJ
Shutdown
Note: Default configuration is JU1, JU2, and JU3 (1 and 2).
2
_______________________________________________________________________________________
MAX1556 Evaluation Kit
Table 2. Output Voltage Selection (MAX1557ETB)
JU4
JU5
JU6
MAX1557 V
1.0V
OUT
1 and 2
1 and 2
2 and 3
2 and 3
—
1 and 2
2 and 3
1 and 2
2 and 3
—
1 and 2
1 and 2
1 and 2
1 and 2
2 and 3
1.3V
1.5V
ADJ
Shutdown
Note: Default configuration is JU4, JU5, and JU6 (1 and 2).
shunt on JU3 for the MAX1556 (JU6 for the MAX1557).
Apply a logic high to SHDN to enable the MAX1556, or
apply a logic low to shut down the MAX1556. Apply a
logic high to SHDN2 to enable the MAX1557, or apply a
logic low to shut down the MAX1557.
External Shutdown Control
The MAX1556 EV kit comes preset with SHDN and
SHDN2 pulled high so that the MAX1556 and MAX1557
are enabled when the input voltage is applied. To operate
the shutdown control from an external signal, remove the
L1
3.3µH
IN
OUT
9
8
IN_P
LX
C1
C2
C3
R5
10µF
22µF
OPEN
100Ω
U1
R1
SHORT
C5
OPEN
7
4
1
10
5
MAX1556
IN
PGND
OUT
GND
GND
C11
0.47µF
1
JU1 2
3
R2
OPEN
D1
SHDN
1
3
3
2
SHDN
D2
SS
JU3
C4
0.001µF
1
JU2
6
2
3
GND
2
EXPOSED PAD
CONNECTED TO GND
Figure 1a. MAX1556 EV Kit Schematic (MAX1556)
_______________________________________________________________________________________
3
MAX1556 Evaluation Kit
L2
4.7µH
IN2
OUT2
9
8
IN_P
LX
C6
C7
C8
10µF
22µF
OPEN
U2
R3
SHORT
C10
OPEN
7
4
1
10
5
MAX1557
IN
PGND
OUT
GND2
GND2
1
JU4 2
3
R4
OPEN
D1
SHDN2
1
3
3
2
SHDN
D2
SS
JU6
C9
0.001µF
1
JU5
6
2
3
GND
2
EXPOSED PAD
CONNECTED TO GND
Figure 1b. MAX1556 EV Kit Schematic (MAX1557)
4
_______________________________________________________________________________________
MAX1556 Evaluation Kit
Figure 2. MAX1556 EV Kit Component Placement Guide—Component Side
Figure 3. MAX1556 EV Kit Component Placement Guide—Solder Side
_______________________________________________________________________________________
5
MAX1556 Evaluation Kit
Figure 4. MAX1556 EV Kit PC Board Layout—Component Side
Figure 5. MAX1556 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.
6 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2004 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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