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| 19-3602; Rev 0; 3/05 MAX1577Z Evaluation Kit General Description The MAX1577Z evaluation kit (EV kit) is a fully assembled and tested circuit for evaluating the MAX1577Z white LED 1x/2x charge pump. The MAX1577Z EV kit strobes a white LED at up to 1.1A using an on-board pulse generator. In movie mode, it drives the LED at a constant 220mA. The current levels are adjusted by changing a resistor. The EV kit can also be used to evaluate the MAX1577Y. o Selectable Flash/Movie Modes o Up to 92% Efficiency (PLED / PBATT) o 3% LED Current Regulation o Adaptive 1x/2x Mode Switchover o 2.7V to 5.5V Supply Voltage Range o 8-Pin TDFN 3mm x 3mm IC Package o Fully Assembled and Tested Features Evaluates: MAX1577Y/MAX1577Z Ordering Information PART MAX1577ZEVKIT TEMP RANGE 0C to +70C IC PACKAGE 8 TDFN (3mm x 3mm) Component List DESIGNATION QTY DESCRIPTION 2.2F 10%, 6.3V X5R ceramic capacitor (0603) Panasonic ECJ1VB0J225K TDK C1608X5R0J225K 4.7F 10%, 6.3V X5R ceramic capacitor (0603) Panasonic ECJ1VB0J475K TDK C1608X5R0J475K 10F 20%, 6.3V X5R ceramic capacitor (0805) Taiyo Yuden JMK212BJ106MG Panasonic ECJ2FB0J106M TDK C2012X5R0J106M 0.047F 10%, 10V X7R ceramic capacitor (0402) Taiyo Yuden LMK105BJ473KV TDK C1005X7R1C473K 0.01F 10%, X7R ceramic capacitor (0402) TDK C1005X7R1E103K or equivalent DESIGNATION D1 D2 JU1, JU3 JU2 R1 R2, R4, R5 R3 SW1 QTY 1 1 2 1 1 3 1 1 DESCRIPTION White LED flash emitter Lumileds LXCL-PWF1 Diode (SOD-323) Central CMDD4448 2-pin headers 3-pin header 0.27 1%, 0.25W resistor (0805) Panasonic ERJ-6RQFR27V 100k 5% resistors (0402) 10k 5% resistor (0402) Momentary pushbutton switch Panasonic EVQ-PHP03T MAX1577ZETA (8-pin TDFN, 3mm x 3mm) Top mark: AMQ MAX6422XS23-T (4-pin SC70) Shunts, 2-position MAX1577ZEVKIT PC board C1 1 C2 1 C3 1 U1 U2 None None 1 1 3 1 C4 1 C5 1 ________________________________________________________________ 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. MAX1577Z Evaluation Kit Evaluates: MAX1577Y/MAX1577Z Table 1. Jumper Descriptions JUMPER JU1 SHORT 1-2 EN1 connects to the output of the on-board pulse generator. SHORT 2-3 N/A OPEN EN1 is pulled low by a 100k resistor. EN1 can be driven from an external pulse generator connected to the EN1 pad on the left side of the EV kit. EN2 is pulled low by a 100k resistor. EN2 can be driven from an external pulse generator connected to the EN2 pad on the left side of the EV kit. Power to the on-board pulse generator is disconnected. Leave JU3 open when measuring the quiescent current of the MAX1577Z. Cut the trace shorting JU4 to use an external LED, or when operating in voltage regulation mode. JU2 EN2 connects to the output of the on-board pulse generator. EN2 connects to IN for movie mode. JU3 Connects power to the onboard pulse generator. N/A JU4 JU4 is shorted on the PC board and connects the white LED to the output of the MAX1577Z. Quick Start Recommended Equipment * 2.7V to 5.5V power supply or battery capable of delivering 2.5A Detailed Description Adjusting the 100% Brightness Level The LED current is adjusted by changing the resistor R1. Calculate the value of R1 with the following equation, where IOUT is the output current in amps for 100% brightness: R1 = 0.3V IOUT Procedure Follow the steps below to verify board operation: 1) Verify that shunts are connected across pins 1-2 of jumpers JU1, JU2, and JU3. 2) 3) Preset the power supply to 4.2V. Turn off the power supply. Do not turn on the power supply until all connections are completed. Connect the positive power-supply terminal to the pad on the EV kit labeled IN. Connect the power-supply ground terminal to the pad on the EV kit labeled GND. Turn on the power supply. The LED will flash once due to the on-board pulse generator circuit powering up. Press the button to flash the LED at 1.1A. The pulse generator limits the flash duration to approximately 125ms. Move jumper JU2 to short pins 2-3 (selects movie mode). Verify that the LED is lit. For more information on setting the brightness, refer to the MAX1577Y/MAX1577Z data sheet. Control Inputs The MAX1577Z has two inputs for selecting 100%, 33%, and 20% output current, or shutdown. Using JU1 and JU2 (see Table 1), these inputs can be connected to the output of the on-board pulse generator for a strobed output, while EN2 can be connected to IN for movie mode, pulled low, or driven from an external pulse generator. With the default 100% current setting (R1 = 0.27), the selectable output currents are described in Table 2. 4) 5) 6) 7) Table 2. Default Output Currents JU1 1-2 JU2 1-2 2-3 OPEN 1-2 OPEN 2-3 OPEN FUNCTION 1100mA Flash 220mA Movie Mode/1100mA Flash 367mA Flash 220mA Flash 220mA Movie Mode Shutdown 8) 9) 2 _______________________________________________________________________________________ MAX1577Z Evaluation Kit When using the on-board pulse generator, the LED flashes when power is first applied to the EV kit. This is due to the pulse generator circuit and not the MAX1577Z. To use external pulse generators, remove the shunts from both JU1 and JU2, and connect the pulse generators to the pads labeled EN1 and EN2. For a simple flash at 100% brightness, connect EN1 to EN2 and drive with a single pulse generator. Evaluating the MAX1577Y To evaluate the MAX1577Y, carefully remove the MAX1577Z from the EV kit and replace with the MAX1577Y. Free samples of the MAX1577Y are available from Maxim. To evaluate the voltage regulation settings of the MAX1577Y, follow the procedure in the Voltage Regulation section. Evaluates: MAX1577Y/MAX1577Z Shutdown To place the MAX1577Z in low-power shutdown mode, remove the shunt from both jumpers JU1 and JU2. For measuring quiescent current while in shutdown mode, also remove the shunt from JU3 to disconnect the onboard pulse generator from the supply. Voltage Regulation The MAX1577Y/MAX1577Z can provide a constant voltage output. In voltage-regulation mode, the MAX1577Z has a fixed 5.1V output. The output voltage of the MAX1577Y is selected using JU1 and JU2. Refer to the MAX1577Y/MAX1577Z data sheet for more information. To configure the MAX1577Z EV kit for voltage regulation, cut the trace shorting JU4. Connect the load from the pad labeled OUT to the pad labeled GND. Connecting External LED(s) To connect external LED(s) to the MAX1577Z EV kit, cut the trace shorting JU4. Connect the anode(s) of the external LED(s) to the pad labeled LED+. Connect the cathode(s) to the pad labeled GND. Component Suppliers SUPPLIER Central Semiconductor Kamaya Lumileds Panasonic Taiyo Yuden TDK Vishay PHONE 631-435-1110 260-489-1533 408-435-6044 714-373-7939 408-573-4150 847-803-6100 402-563-6866 WEB www.centralsemi.com www.kamaya.com www.lumileds.com www.panasonic.com www.t-yuden.com www.component.tdk.com www.vishay.com Diodes Resistors LEDs Capacitors, resistors, switches Capacitors Capacitors Resistors COMPONENTS Note: Indicate that you are using the MAX1577Y/MAX1577Z when contacting these component suppliers. _______________________________________________________________________________________ 3 MAX1577Z Evaluation Kit Evaluates: MAX1577Y/MAX1577Z C1 2.2F IN IN C2 4.7F 5 GND U1 PULSE R1 0.27 JU4 CS 7 LED+ D1 GND 6 IN OUT 8 2 CP 3 CN C3 10F OUT GND 2 EN1 JU1 1 MAX1577Z 1 4 EN1 EN2 R4 100k R5 100k EN2 IN 3 2 IN 1 JU3 2 1 JU2 PULSE R2 100k 2 SW1 3 R3 10k D2 1 VCC U2 RESET 4 PULSE C4 0.047F SRT 3 C5 0.01F 2 GND MAX6422 Figure 1. MAX1577Z EV Kit Schematic 4 _______________________________________________________________________________________ MAX1577Z Evaluation Kit Evaluates: MAX1577Y/MAX1577Z Figure 2. MAX1577Z EV Kit Component Placement Guide--Component Side _______________________________________________________________________________________ 5 MAX1577Z Evaluation Kit Evaluates: MAX1577Y/MAX1577Z Figure 3. MAX1577Z EV Kit PC Board Layout--Component Side 6 _______________________________________________________________________________________ MAX1577Z Evaluation Kit Evaluates: MAX1577Y/MAX1577Z Figure 4. MAX1577Z 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 _____________________ 7 (c) 2005 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc. |
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