Evaluates: MAX17552 (MAX) in 5V MAX17552 5V Output Evaluation Output-Voltage Application Kit (MAX) General Description Quick Start The MAX17552 5V evaluation kit (EV kit) (MAX ) is Recommended Equipment a fully assembled and tested circuit board that demon- MAX17552 5V EV kit (MAX) strates the performance of the MAX17552 60V, 100mA 60V adjustable, 0.5A DC power supply ultra-small, high-efficiency, synchronous step-down DC-DC converter in a 10-pin MAX package. The EV Electronic load up to 100mA kit operates over a wide input voltage range of 6V to Voltmeter 60V and provides up to 100mA load current at 5V out- Procedure put. It draws only 26A supply current under no-load The EV kit is fully assembled and tested. Follow the steps conditions (EN/UVLO connected to V ). The EV kit is IN below to verify board operation. Caution: Do not turn on programmed to switch at a frequency of 220kHz and the power supply until all connections are completed. delivers a peak efficiency of 93% with the supplied components. The device is simple to use and easily con- 1) Verify that shunts are installed on jumpers JU1 and figurable with minimal external components. It features JU2 (EN/UVLO). cycle-by-cycle peak current-limit protection, undervoltage 2) Verify that jumper JU3 (MODE-PFM operation) is open. lockout and thermal shutdown. 3) Set the electronic load to constant-current mode, The EV kit comes installed with the MAX17552AUB+ in 100mA, and disable the electronic load. an 10-pin (3mm x 3mm), lead(Pb)-free/RoHS-compliant 4) Connect the electronic loads positive terminal to the MAX package. VOUT PCB pad. Connect the negative terminal to the GND PCB pad. Features and Benefits 5) Connect the voltmeter across the VOUT and GND 6V to 60V Input Voltage Range PCB pads. 5V Output, 100mA Continuous Current 6) Set the power-supply output to 24V. Disable the 93% Peak Efficiency power supply. 26A No-Load Supply Current 7) Connect the power-supply output to the VIN PCB pad. Connect the supply ground to the GND PCB EN/UVLO for On/Off Control and Programmable pad. Input Undervoltage Lockout 8) Turn on the power supply. Programmable Switching Frequency 9) Enable the electronic load and verify that output Internal or Programmable Soft-Start voltage is 5V with respect to GND. PFM or Forced-PWM Mode of Operation 10) Vary the input voltage from 6V to 60V. RESET Output 11) Vary the load current from 1mA to 100mA and verify Peak Current-Limit Protection that output voltage is 5V with respect to GND. Thermal Shutdown Note: While performing an output short-circuit test, it is possible for the ceramic output capacitor to oscillate with Proven PCB Layout the wiring inductance between the capacitor and short- Fully Assembled and Tested circuited load, and thereby cause the absolute maximum rating of VOUT pin (-0.3V) to be exceeded. The resistor (R7) and the capacitor (C5) are included on this EV kit to protect against unintentional violation of the above men- Ordering Information appears at end of data sheet. tioned rating. In the actual system design, parasitic board or wiring inductance should be minimized and the output- voltage waveform under short-circuit operation should be verified to ensure that the absolute maximum rating of MAX is a registered trademark of Maxim Integrated Products, Inc. VOUT pin is not exceeded. 19-6906 Rev 1 4/14Evaluates: MAX17552 (MAX) in 5V MAX17552 5V Output Evaluation Kit (MAX) Output-Voltage Application MAX17552 IC data sheet for additional information on Detailed Description setting the UVLO threshold voltage. The MAX17552 5V EV kit (MAX) is a fully assembled and tested circuit board that demonstrates the performance RESET Output of the MAX17552 60V, 100mA ultra-small, high-efficiency, The EV kit provides a PCB pad to monitor the status of synchronous step-down DC-DC converter in a 10-pin the RESET output. RESET goes high when output volt- MAX package. The EV kit operates over a wide input age rises above 95% (typ) of its nominal regulated output voltage range of 6V to 60V and provides up to 100mA voltage. RESET goes low when output voltage falls below load current at 5V output. It draws only 26A supply 92% (typ) of its nominal regulated voltage. current under no-load conditions (EN/UVLO connected to V ). The EV kit is programmed to PFM or Forced-PWM Mode (MODE) IN switch at a frequency of 220kHz and delivers a peak The EV kit includes a jumper (JU3) to select the mode efficiency of 93% with the supplied components. The of operation of the converter. Install a shunt across JU3 device is simple to use and easily configurable with minimal before powering up the EV kit to enable the forced-PWM external components. It features cycle-by-cycle peak operation. Keep JU3 open to enable the light-load PFM current-limit protection, undervoltage lockout and thermal operation. See Table 2 for proper JU3 settings. shutdown. Soft-Start The EV kit includes an EN/UVLO PCB pad and jumpers The EV kit offers a fixed 5ms soft-start time. Connect the JU1 and JU2 to enable control of the converter output. capacitor C4 to adjust the soft-start time (t ). Use the SS The MODE PCB pad and jumper JU3 are provided for following equation to determine the soft-start capacitance selecting the mode of operation of the converter. RESET value (C ): SS PCB pad is available for monitoring the RESET output. The RT/SYNC PCB pad can be used to synchronize the CSS = 6.25 x t SS EV kit switching frequency to an external clock frequency. where t is in milliseconds and C is in nanofarads. SS SS Enable Control (JU1, JU2) External Synchronization (RT/SYNC) The EN/UVLO pin on the EV kit serves as an on/off control The EV kit provides a PCB pad to synchronize the EV while also allowing the user to program the input under- kit switching frequency to an external clock frequency. voltage lockout (UVLO) threshold. Jumpers JU1 and JU2 Apply the external clock to the RT/SYNC PCB pad configure the EV kits output for turn-on/turn-off control. though an AC-coupling capacitor. Refer to the External See Table 1 for proper JU1, JU2 jumper configurations. Synchronization section in the MAX17552 IC data sheet Additionally, resistors R1 and R2 are included to set the for additional information on configuring the external UVLO to a desired turn-on voltage. Refer to the Setting clock and selecting the AC-coupling capacitor. the Input Undervoltage-Lockout Level section in the Table 1. Enable Control (EN/UVLO) (JU1, JU2) SHUNT POSITION EN/UVLO PIN VOUT OUTPUT JU1 JU2 1-2 Open Connected to VIN Enabled Open 1-2 Connected to GND Disabled 1-2* 1-2 Connected to midpoint of R1/R2 resistor-divider Enabled at VIN 6V *Default position. Table 2. MODE Control (JU3) SHUNT POSITION MODE PIN MODE OF OPERATION 1-2 Connected to GND Forced PWM Open* Unconnected PFM *Default position. Maxim Integrated 2 www.maximintegrated.com