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19-3415; Rev 0; 9/04
MAX1556 Evaluation Kit
General Description
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 delivers 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. Up to 97% Efficiency 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) Voltage Positioning Optimizes Load-Transient Response Low 16A Quiescent Current Low 27A Quiescent Current in Dropout Low 0.1A Shutdown Current Analog Soft-Start with Zero Overshoot Current Small, 10-Pin, 3mm x 3mm TDFN Package Fully Assembled and Tested
Features
Evaluates: MAX1556/MAX1557
Component List
DESIGNATION QTY DESCRIPTION 10F 10%, 6.3V X5R ceramic capacitors (0805) Murata GRM21BR60J106K or equivalent 22F 10%, 6.3V X5R ceramic capacitors (1206) Murata GRM31CR60J226K or equivalent Not installed, capacitors (0805) 0.001F 10%, 50V X7R ceramic capacitors (0402) Murata GRP155R71H102K or equivalent Not installed, capacitors (0603) 0.47F 10%, 6.3V X5R ceramic capacitor (0402) Murata GRM155R60J474K or equivalent 3-pin headers 3.3H inductor, 0.036, 1.3A, 5.0mm x 5.0mm x 2.0mm Taiyo Yuden LMNP04SB3R3N 4.7H inductor, 0.05, 1.2A, 5.0mm x 5.0mm x 2.0mm Taiyo Yuden LMNP04SB4R7N Shorted on PC board, resistors (0603) Not installed, resistors (0603) 100 1% resistor (0402) MAX1556ETB MAX1557ETB Shunts, position 2 MAX1556 EV kit PC board
C1, C6
2
C2, C7
2
C3, C8
0
C4, C9
2
Ordering Information
PART MAX1556EVKIT TEMP RANGE 0C to +70C IC PACKAGE 10 TDFN-EP*
C5, C10
0
*EP = Exposed paddle.
C11
1
Component Suppliers
SUPPLIER Murata Taiyo Yuden Vishay PHONE 814-237-1431 408-573-4150 402-563-6866 WEBSITE www.murata.com www.t-yuden.com www.vishay.com
JU1-JU6 L1
6 1
L2
1
Note: Indicate that you are using the MAX1556 when contacting these component suppliers.
R1, R3 R2, R4 R5 U1 U2 None None
0 0 1 1 1 6 1
Quick Start
Recommended Equipment
* * One variable DC power supply capable of supplying up to 5.5V at 1.2A One voltmeter (DMM)
________________________________________________________________ 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 Evaluates: MAX1556/MAX1557
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. 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. 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 IN. Connect the power-supply ground to the pad labeled GND nearest the IN pad. 5) Turn on the power supply and verify the output voltage is the desired voltage from setting JU1, JU2, and JU3 (default is 1.8V). 5) Turn on the power supply and verify the output voltage is the desired voltage from setting JU4, JU5, and JU6 (default is 1.0V).
Detailed Description
The MAX1556 EV kit contains two separate PWM stepdown 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. The top circuit (MAX1556) provides pin-selectable output voltages of 3.3V, 2.5V, 1.8V, and adjustable at 1.2A. The bottom circuit (MAX1557) provides pin-selectable output voltages of 1.5V, 1.3V, 1.0V, and adjustable at 600mA.
Pin-Selectable Output Voltages
The MAX1556 output voltage is selected with JU1 and JU2, as shown in Table 1. 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: 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.
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.
Table 1. Output Voltage Selection (MAX1556ETB)
JU1 1 and 2 1 and 2 2 and 3 2 and 3 -- JU2 1 and 2 2 and 3 1 and 2 2 and 3 -- JU3 1 and 2 1 and 2 1 and 2 1 and 2 2 and 3 MAX1556 VOUT 1.8V 2.5V 3.3V ADJ Shutdown
Note: Default configuration is JU1, JU2, and JU3 (1 and 2).
2
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MAX1556 Evaluation Kit Evaluates: MAX1556/MAX1557
Table 2. Output Voltage Selection (MAX1557ETB)
JU4 1 and 2 1 and 2 2 and 3 2 and 3 -- JU5 1 and 2 2 and 3 1 and 2 2 and 3 -- JU6 1 and 2 1 and 2 1 and 2 1 and 2 2 and 3 MAX1557 VOUT 1.0V 1.3V 1.5V ADJ Shutdown
Note: Default configuration is JU4, JU5, and JU6 (1 and 2).
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
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.
IN
9 R5 100 C1 10F
IN_P
LX
8
L1 3.3H C2 22F C3 OPEN C5 OPEN R1 SHORT
OUT
U1 1 C11 0.47F OUT 1 JU1 2 3 10 D1 IN MAX1556 PGND 7
GND
4 GND R2 OPEN
SHDN
1 3
2 JU3 1 2 3 JU2
5
SHDN
SS
3 C4 0.001F
6
D2 GND 2 EXPOSED PAD CONNECTED TO GND
Figure 1a. MAX1556 EV Kit Schematic (MAX1556)
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3
MAX1556 Evaluation Kit Evaluates: MAX1556/MAX1557
IN2
9 C6 10F
IN_P
LX
8
L2 4.7H C7 22F C8 OPEN C10 OPEN R3 SHORT
OUT2
U2 1 IN MAX1557 PGND 7
GND2
OUT 1 JU4 2 3 10 D1
4 GND2 R4 OPEN
SHDN2
1 3
2 JU6 1 2 3 JU5
5
SHDN
SS
3 C9 0.001F
6
D2 GND 2 EXPOSED PAD CONNECTED TO GND
Figure 1b. MAX1556 EV Kit Schematic (MAX1557)
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MAX1556 Evaluation Kit Evaluates: MAX1556/MAX1557
Figure 2. MAX1556 EV Kit Component Placement Guide--Component Side
Figure 3. MAX1556 EV Kit Component Placement Guide--Solder Side
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MAX1556 Evaluation Kit Evaluates: MAX1556/MAX1557
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 (c) 2004 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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