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| 19-2253; Rev 0; 12/01 MAX5026 Evaluation Kit General Description The MAX5026 evaluation kit (EV kit) provides a +30V output voltage from a +3V to +11V input source. It delivers up to 6mA output current, depending on the input voltage. The MAX5026 is a constant-frequency, pulse-width-modulating (PWM), current-mode step-up voltage converter with an internal power switch that operates at 500kHz. This EV kit demonstrates the lownoise performance of the device. The MAX5026 EV kit is a fully assembled and tested surface-mount circuit board. With modifications, this EV kit can also be used to evaluate MAX5025/ MAX5027/MAX5028. The EV kit can be used to evaluate other output voltages by changing the feedback resistors. o +3V to +11V Input Voltage Range (MAX5026/MAX5028) o +4.5V to +11V Input Voltage Range (MAX5025/MAX5027) o Output Voltage: Adjustable Output Voltage Up to +36V (MAX5025/MAX5026) +30V Fixed Output Voltage (MAX5027/MAX5028) o Low Switching Noise o 500kHz Switching Frequency o Less than 1mVp-p High-Frequency Output Switching Ripple at 2mA Load o Up to 6mA Output Current with +5V Input o 6-Pin SOT23 Package o Surface-Mount Construction o Fully Assembled and Tested Features Evaluates: MAX5025-MAX5028 Component List DESIGNATION C1 QTY 1 DESCRIPTION 4.7F, 16V, X5R, 20% ceramic capacitor (1206) Taiyo Yuden EMK316BJ475ML 1F, 50V, X7R, 10% ceramic capacitors (1210) Taiyo Yuden UMK325BJ105KH TDK C3225X7R1H105K Murata GRM42-2X7R105K050AD Not installed, capacitor (1210) 47H 20% power inductor Toko A915BY-470M Sumida CDRH4D28-470 0.5A, 40V Schottky diode (SOT23) Zetex ZHCS500 147k 1% resistor (0603) 6.34k 1% resistor (0603) 100 5% resistor (0805) MAX5026EUT (6-Pin SOT23) 3-pin header (JU1) Oscilloscope jack Shunt MAX5026 PC board MAX5026 EV kit data sheet MAX5026 data sheet C2, C3 2 C4, C5 0 Ordering Information PART MAX5026EVKIT TEMP. RANGE 0 C to +70 C o o L1 D1 R1 R2 R3 U1 JU1 J1 None None None None 1 1 1 1 1 1 1 1 1 1 1 1 IC PACKAGE 6 SOT23-6 Note: To evaluate the MAX5025/MAX5027/MAX5028, request a MAX5025EUT/MAX5027EUT/MAX5028EUT free sample with the MAX5026EVKIT. ________________________________________________________________ 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. MAX5026 Evaluation Kit Evaluates: MAX5025-MAX5028 Component Suppliers SUPPLIER Murata Sumida Taiyo Yuden TDK Toko PHONE 770-436-1300 847-545-6700 800-348-2496 847-803-6100 847-297-0070 FAX 770-436-3030 847-545-6720 847-925-0899 847-390-4405 847-699-1194 WEBSITE www.murata.com www.sumida.com www.t-yuden.com www.tdk.com www.tokoam.com Zetex 631-543-7100 631-864-7630 www.zetex.com Note: Please indicate that you are using the MAX5025-MAX5028 when contacting these component suppliers. Quick Start The MAX5026 EV kit is a fully assembled and tested surface-mount board. Follow the steps below to verify board operation. Do not turn on the power supply until all connections are completed. the pads labeled C5. Without the 10F capacitor, the peak-to-peak low-frequency noise is about 20mV. The peak-to-peak low-frequency noise drops to 3mV when the 10F capacitor is included. Evaluating Other Output Voltages The default output for the MAX5026 EV kit is +30V. To generate output voltages other than +30V with either the MAX5025EUT or MAX5026EUT, change feedback resistors R1 and R2. Limit the current through R1 and R2 to about 200A. R1 = R2 [(VOUT /1.25V) - 1]. Evaluating MAX5026 1) 2) Verify that there is a shunt across JU1 (SHDN) pins 1 and 2. Connect a voltmeter and load (if any) to the VOUT pad (and/or plug an oscilloscope probe into the oscilloscope jack). Connect a +3V to +11V power supply to the VIN pad. Connect the power-supply ground to the GND pad closest to VIN. Turn on the power supply and verify that the output voltage is approximately +30V. Evaluating MAX5027/MAX5028 The MAX5026 EV kit can also be used to evaluate the MAX5027/MAX5028 boost converters with fixed +30V output. To evaluate MAX5027/MAX5028, remove the feedback resistors R1 and R2, short the two pads of R1, and replace the MAX5026EUT with a MAX5027EUT/ MAX5028EUT. 3) 4) To evaluate other output voltages, refer to the Evaluating Other Output Voltages section. Detailed Description Shutdown Function The MAX5026 EV kit contains a boost converter. The circuit provides a +30V output with less than 2mVp-p highfrequency ripple from a +3V to +11V input voltage, and delivers up to 6mA. The setting of jumper JU1 selects the circuit operating modes. Table 1 shows the functions of jumper JU1. VOUT 1mV/div AC-COUPLED LX PIN 20V/div 0V IL 200mA/div Noise Performance The MAX5026 EV kit is specifically designed for lownoise performance. An RC filter at the regulator's output reduces its noise further. To observe this filtered output, monitor the signal at oscilloscope jack J1. The high-frequency output ripple voltage is less than 1mVp-p at 2mA load current. Extra capacitor pads (C4 and C5) are provided for further noise reduction. To reduce lowfrequency noise, add a 10F electrolytic capacitor at 0mA 1s/div MAX5026, VCC = 5V, VOUT = +30V, ILOAD = 2mA Figure 1. Medium-Load Switching Waveform with RC Filter 2 _______________________________________________________________________________________ MAX5026 Evaluation Kit Table 1. Jumper JU1 Functions SHUNT LOCATION 1 and 2 2 and 3 Open SHDN PIN Connected to VIN Connected to GND Connected to SHDN pad MAX5026 OUTPUT MAX5026 enabled, VOUT = +30V Shutdown mode, VOUT = VIN - VD, where VD is the diode forward-voltage drop External logic signal enables or disables the MAX5026 output Evaluates: MAX5025-MAX5028 L1 47H J1 D1 VIN C1 4.7F 16V 1 VIN SHDN 1 23 JU1 4 3 R2 6.34k 1% PGND 5 VCC U1 MAX5026 GND 2 2 R R1 147k 1% C4 C2 1.0F OPEN 50V C5 C3 OPEN 1.0F 50V GND GND LX 6 1L 3 R3 100 VOUT 1 2 VOUT SHDN FB Figure 2. MAX5026 EV Kit Schematic _______________________________________________________________________________________ 3 MAX5026 Evaluation Kit Evaluates: MAX5025-MAX5028 1.0" 1.0" Figure 3. MAX5026 EV Kit Component Placement Guide--Top Silkscreen Figure 4. MAX5026 EV Kit PC Board Layout--Component Side 1.0" Figure 5. MAX5026 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) 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. |
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