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MAX77231 Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX77231 Datasheet(HTML) 1 Page - Maxim Integrated Products |
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1 / 10 page  Evaluates: MAX77231 MAX77231 Evaluation Kit General Description The MAX77231 evaluation kit (EV kit) is a fully assembled and tested PCB for evaluating the MAX77231 low-noise step-up DC-DC converter. It is optimized for boost applications requiring very low ripple/noise and small PCB space. The EV kit is set up to provide an 11.2V output from an input voltage ranging from 2.7V to 4.8V, and can deliver up to 10mA of current. The output ripple and noise are suppressed to 35µVRMS. Other output voltages up to 16.2V can be factory set. Jumpers are provided to help evaluate features of the MAX77231 IC. Features ● Ultra-Small Solution Circuit Area (< 7mm2) ● 35µVRMS Typical Output Ripple/Noise ● 2.7V to 4.8V Input Range ● 11.2V/10mA Output ● Output Factory-Trimmable from 11.2V to 16.2V ● 125µA No-Load Supply Current—Output On ● < 1µA Shutdown Supply Current ● True Shutdown Load Disconnect ● Selectable Active Discharge ● Proven PCB layout ● Fully Assembled and Tested 19-7638; Rev 0; 1/16 Ordering Information appears at end of data sheet. Quick Start Recommended Equipment ● MAX77231 EV kit ● 2.5V to 6V 100mA bench power supply (PS1) ● Two digital multimeters (DMM1, DMM2) ● 0–50mA electronic load or appropriate load resistors Procedure The EV kit is a fully assembled and tested surface mount circuit board. Follow the steps below to set up and verify the IC and board operation: 1) Verify that the jumpers on the EV kit are configured as shown in Table 1. 2) If using an electronic load, set it to 6mA and turn it off. Alternately, obtain a 2kΩ resistor (values from 1.8kΩ to 2.4kΩ are also acceptable). 3) Set the power supply to 3.6V and turn it off. 4) Connect the MAX77231 evaluation board, bench power supply and DMMs as shown in Figure 1. 5) Turn on the power supply. 6) Verify that voltage read by DMM1 is 3.6V. 7) Verify that voltage read by DMM2 is 11.2V. 8) Sweep the power supply down to 2.7V. 9) Verify that voltage read by DMM2 is 11.2V. 10) Sweep the power supply up to 4.8V. 11) Verify that voltage read by DMM2 is 11.2V. 12) Disconnect RL (or electronic load). 13) Verify that voltage read by DMM2 is 11.2V. Table 1. Default Jumper Settings JUMPER DEFAULT SHUNT POSITION MODE JU1 1-2 Active Discharge Off JU2 1-2 Power On |
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