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| 19-3393; Rev 0; 8/04 MAX8556 Evaluation Kit General Description The MAX8556 evaluation kit (EV kit) is a fully assembled and tested surface-mount circuit board demonstrating the MAX8556 low-dropout (LDO) regulator. The EV kit comes assembled with a MAX8556ETE circuit that steps down a 1.425V to 3.6V input voltage range to a 1.2V output capable of sourcing up to 4A (limited by power dissipation). The MAX8556 features a POK output that goes high impedance once the output is within 10% of its regulation value. The device utilizes an internal p-channel MOSFET for reduced dropout and quiescent current. In addition, the p-channel MOSFET eliminates the need for an external bias or noisy charge pump. The MAX8556 EV kit can also be used to evaluate the MAX8557 with no component changes. 1.425V to 3.6V Input Voltage Range 1.2V Output Voltage Up to 4A Output Current Low Dropout Voltage (200mV max at 4A) Internal p-Channel MOSFET Pass Transistor Power-OK (POK) Output Fully Assembled and Tested Features Evaluates: MAX8556/MAX8557 Component List DESIGNATION C1-C4 QTY 4 DESCRIPTION 10F 20%, 6.3V X5R ceramic capacitors (0805) Taiyo Yuden JMK212BJ106MG 3-pin header Sullins PTC36SAAN 100k 5% resistor (0603) 1.40k 0.1% resistor (0603) Vishay TNPW06031401BT9RT1 1k 0.1% resistor (0603) Panasonic ERA3YEB102V MAX8556ETE (16-pin Thin QFN) Shunt MAX8556EVKIT PC board PART MAX8556EVKIT Ordering Information TEMP RANGE 0C to +70C IC PACKAGE 16 Thin QFN 5mm x 5mm Note: To evaluate the MAX8557, request a MAX8557ETE free sample with the MAX8556 EV kit. JU1 R1 R2 R3 U1 None None 1 1 1 1 1 1 1 Component Suppliers SUPPLIER Panasonic Taiyo Yuden Vishay COMPONENT Resistors Capacitors Resistors PHONE 714-373-7366 408-573-4150 402-563-6866 WEBSITE www.maco.panasonic.co.jp www.t-yuden.com www.vishay.com Note: Indicate that you are using the MAX8556/MAX8557 when contacting these component suppliers. ________________________________________________________________ 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. MAX8556 Evaluation Kit Evaluates: MAX8556/MAX8557 Recommended Equipment * One 4V, 5A variable-output power supply * Dummy load capable of sinking 4A * Digital multimeter (DMM) Detailed Description Adjusting the Output Voltage R2 and R3 are used to adjust the output voltage for the MAX8556. To adjust the output voltage, replace R2 with a 0.1% resistor that is calculated as: R2 = 1 x 103 x ((VOUT / VFB) - 1) where VFB is 0.5V and VOUT is the desired output voltage. Quick Start The MAX8556 EV kit is fully assembled and tested. Follow these steps to verify board operation: 1) Preset the power supply to 1.425V and turn off the power supply. Do not turn on the power supply until all connections are made. 2) Verify that the shunt is across pins 2 and 3 of JU1 to enable the device. 3) Connect the positive lead of the power supply to the VIN pad on the EV kit, and the negative lead of the power supply to the GND pad on the EV kit. 4) Connect the positive input of the DMM to the VOUT pad on the EV kit, and the negative input of the DMM to the GND pad on the EV kit to measure the output voltage. 5) Turn on the power supply and verify that the output voltage is 1.2V 1%. 6) Sweep the input voltage from +1.425V to +3.6V. Verify that the output voltage is 1.2V 1% over the entire input range. 7) Set the power supply to 2V. 8) Connect the 4A load between the VOUT and GND pads on the EV kit. 9) Verify that the output voltage is 1.2V 1%. POK Output The MAX8556 has an open-drain POK output that goes high impedance after the output is within 10% of the regulation voltage. On the EV kit, R1 pulls up POK to VIN. The MAX8556 EV kit can also be used to evaluate the MAX8557. In this case, the POK output becomes the POR output. Shutdown The MAX8556 features a shutdown mode to power down the output and reduce input current. To shut down the device, place the shunt between positions 1 and 2 of JU1. To operate normally, place the shunt between positions 2 and 3 of JU1. Jumper Settings Table 1. Jumper JU1 Functions (EN) SHUNT LOCATION 1 and 2 2 and 3 EN CONNECTION Connected to GND Connected to VIN OPERATION Output disabled Output enabled 2 _______________________________________________________________________________________ MAX8556 Evaluation Kit Evaluates: MAX8556/MAX8557 VIN 1.425V TO 3.6V C1 10F C2 10F 1, 2, 3, 4, 5, 6 IN OUT U1 7, 8, 9, 10, 11 R2 1.4k 0.1% R3 1.0k 0.1% GND N.C. 15 14 C3 10F VOUT 1.2V AT 4A C4 10F GND GND R1 100k MAX8556ETE FB 13 POK 3 JU1 2 1 12 16 POK EN Figure 1. MAX8556 EV Kit Schematic Figure 2. MAX8556 EV Kit Component Placement Guide--Top Silkscreen Figure 3. MAX8556 EV Kit PC Board Layout--Component Side _______________________________________________________________________________________ 3 MAX8556 Evaluation Kit Evaluates: MAX8556/MAX8557 Figure 4. MAX8556 EV Kit PC Board Layout--Layer 2 Figure 5. MAX8556 EV Kit PC Board Layout--Layer 3 Figure 6. MAX8556 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 _____________________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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