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MAX1820 Datasheet(PDF) 2 Page - Maxim Integrated Products |
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MAX1820 Datasheet(HTML) 2 Page - Maxim Integrated Products |
2 / 6 page MAX1820 Evaluation Kit 2 _______________________________________________________________________________________ Quick Start The MAX1820 EV kit is fully assembled and tested. Follow these steps to verify board operation. Do not turn on the power supply until all connections are completed. Variable Output (Top Circuit) 1) Verify that shunts are across pins 1 and 2 of jumpers JU1 (SHDN) and JU2 (SKIP). 2) Verify that a shunt is installed on jumper JU3 (SYNC). 3) Connect a +2.7VDC to +5.5VDC power supply to the VIN pad. Set the power supply to more than +3.6V. Connect the supply ground to the PGND pad. 4) Connect a voltmeter to the VOUT pad. 5) Connect an external voltage reference or DAC out- put to the reference (REF) BNC connector. The volt- age reference or DAC must have an adjustable range of +0.227V to +1.932V. 6) Turn on the power supply first, then the voltage ref- erence source. 7) Set the reference voltage to +0.227V and verify that VOUT is at +0.4V. 8) Set the reference voltage to +1.932V and verify that VOUT is at +3.4V +1.5V Output (Bottom Circuit) 1) Verify that shunts are across pins 1 and 2 of jumpers JU4 (SHDN) and JU5 (SKIP). 2) Verify that a shunt is installed on jumper JU6 (SYNC). 3) Connect a +2.7VDC to +5.5VDC power supply to the VIN pad. Connect the supply ground to the PGND pad. 4) Connect a voltmeter to the VOUT pad. 5) Turn on the power supply and verify that VOUT is at +1.5V. For instructions on selecting the feedback resistors for other output voltages, see the Evaluating Other Output Voltages (Bottom Circuit) section. Detailed Description The MAX1820 EV kit contains two separate buck switching-regulator circuits. Either circuit can be pow- ered from a DC power supply with an input range of +2.7V to +5.5V. PC board pads for the SHDN signal are provided on both circuits to interface with an external controller. The top circuit provides a dynamically variable DC out- put voltage in the +0.4V to +3.4V range and provides up to 600mA as configured. A MAX1820 in a 10-pin µMAX package is used for this circuit. To obtain up to +3.4V at the output, +3.6V to +5.5V must be fed to the input; 50 Ω terminated BNC connectors are provided for the SYNC and REF signal pins that synchronize the cir- cuit to an external sine-wave source and adjust the out- put voltage with an external reference source, (for eval- uating the MAX1820X and MAX1820Y) respectively. The bottom circuit supplies a +1.5V output at up to 600mA as configured. A MAX1821 in a 10-pin µMAX package is used for this circuit. A PC board pad is pro- vided for the SYNC signal, which synchronizes the cir- cuit to an external sine-wave source (for evaluating the MAX1821X). The MAX1820 EV kit provides two jumper-selectable operational modes, Normal and Forced PWM. In Normal mode, the circuit operates in Pulse Skip mode for light loads and PWM mode for heavy loads. In Forced PWM mode, the circuit always operates in PWM mode for all loads. Jumper Selection Shutdown Mode (Top and Bottom Circuits) The MAX1820 EV kit features a shutdown mode that reduces the MAX1820/MAX1821 quiescent current to 0.1µA (typ), thus preserving battery life. The 3-pin jumpers, JU1 and JU4, select the shutdown mode for the MAX1820 EV kit. Table 1 lists the selectable jumper options. SHUNT LOCATION SHDN PIN MAX1820/MAX1821 OUTPUT 1, 2 Connected to VIN MAX1820, MAX1821 enabled 2, 3 Connected to GND Shutdown mode, disabled None External controller connected to SHDN pad Logic high = enabled Logic low = disabled Table 1. Jumpers JU1 and JU4 Functions |
Número de pieza similar - MAX1820 |
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Descripción similar - MAX1820 |
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