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MAX17574 Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX17574 Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 20 page Pin Description (continued) NAME PIN FUNCTION 10 EN/UVLO Enable/Undervoltage Lockout Pin. Drive EN/UVLO high to enable the output. Connect to the center of the resistor-divider between VIN and SGND to set the input voltage at which the part turns on. Connect to VIN pins for always-on operation. 12 VCC 5V LDO Output of the Part. Bypass VCC with a 2.2μF ceramic capacitance to SGND. 14 RESET Open-Drain RESET Output. The RESET output is driven low if FB drops below 92% of its set value. RESET goes high 1024 cycles after FB rises above 95% of its set value. 15 MODE/ SYNC MODE pin configures the device to operate either in PWM, PFM, or DCM modes of operation. Leave MODE unconnected for PFM operation (pulse-skipping at light loads). Connect MODE to SGND for constant-frequency PWM operation at all loads. Connect MODE to VSS for DCM operation. The device can be synchronized to an external clock using this pin. See the Mode Selection (MODE) section and the External Frequency Synchronization section for more details. 16 SS Soft-Start Input. Connect a capacitor from SS to SGND to set the soft-start time. 17 CF At switching frequencies lower than 500kHz, connect a capacitor from CF to FB. Leave CF open if switching frequency is equal or more than 500kHz. 18 FB Feedback Input. Connect FB to the center tap of an external resistor-divider from the output to SGND to set the output voltage. See the Adjusting Output Voltage section for more details 19 RT Connect a resistor from RT to SGND to set the regulator’s switching frequency between 100kHz and 2.2MHz. Leave RT open for the default 500kHz frequency. See the Setting the Switching Frequency (RT) section for more details. 20 EXTVCC External Power Supply Input for the Internal LDO. Applying a voltage between 4.84V and 24V at EXTVCC pin will bypass the internal LDO and improve efficiency. Add a 4.7Ω resistor from buck output to this pin to limit VCC bypass cap discharge current during output short-circuit condition. Also, add a local bypassing on this pin to SGND. 21 SGND Analog Ground. 22 BST Boost Flying Capacitor. Connect a 0.1μF ceramic capacitor between BST and LX. — EP Exposed Pad. Connect to the GND pin of the IC. Connect to a large copper plane below the IC to improve heat dissipation capability. MAX17574 4.5V–60V, 3A, High-Efficiency, Synchronous Step-Down DC-DC Converter with Internal Compensation www.maximintegrated.com Maxim Integrated │ 11 |
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