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MAX1562 Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX1562 Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 14 page Detailed Description The MAX1562/MAX1562H/MAX1563 family comprises a programmable current-limited switch designed for USB and hot-swap applications. The MAX1563 can be pro- grammed for loads up to 4A, and the MAX1562/ MAX1562H can be programmed for loads up to 3A. The current limit is programmed using a single resistor. A fault output notifies the host when the current-limit, short-cir- cuit, UVLO, or thermal-shutdown threshold is exceeded. A built-in current limit protects the load and the source in the event of an overload condition. In addition, a built-in short-circuit detection circuit pulses the output if the output is less than 1V (typ), resulting in a lower RMS output current and reduced power dissipation in the device. Thermal shutdown protects the device in the event of a prolonged overload or short-circuit condition. An internal micropower charge pump generates the high-side supply needed for driving the gate of the internal low-RON NMOS switch. Fault blanking allows the MAX1562/MAX1562H/ MAX1563 family to handle USB loads that may not be fully compliant with USB specifications. USB loads with additional bypass capacitance or large startup currents can be successfully powered while protecting the upstream power source. If the switch brings up the load within the blanking period (20ms typ), FAULT is not asserted. In the event of a current-limit event, cur- rent through the switch is regulated at the current-limit target. Below approximately 1V, the short-circuit current limit is 30% higher than the programmed current limit. Current-Limit Programming The MAX1562/MAX1562H/MAX1563 continuous current limit is set by selecting the value of RISET based on the Programmable 4A USB Current-Limited Switches with Autoreset and Fault Blanking _______________________________________________________________________________________ 7 Pin Description PIN MAX1562 MAX1562H SO MAX1563 (TQFN-EP) NAME FUNCTION 1 4 ON (ON) Switch On/Off Control Input. The active polarity of ON is low for the MAX1562 and high for the MAX1562H. For the MAX1563, the active polarity of ON is set by SEL. 25 FAULT Fault Indicator Output. FAULT is an open-drain output that asserts low when the switch enters a sustained (>20ms) current limit. FAULT goes low immediately during thermal shutdown or an undervoltage input. Note that during severe short conditions, FAULT goes low immediately since there is typically also a brief undervoltage transient. 3 6 GND Ground 4 7 ISET Current-Limit Input. Connect an external resistor from ISET to GND to set current limit, where ILIM = 17120 / RISET. 5, 7 9, 12 IN Power Input for Switch. Connect both IN inputs together and bypass with a 1µF ceramic capacitor to GND. Load conditions might require additional bulk capacitance to prevent fluctuation on the input source. 6, 8 1, 10 OUT Power Output for Switch. Bypass OUT to GND with a 4.7µF ceramic capacitor. Load conditions might require additional bulk capacitance. When disabled, OUT goes into a high-impedance state. — 2, 8, 11 N.C. No Connection. Internally unconnected. Leave unconnected or use with other traces to simplify PC board layout. — 3 SEL Polarity Control Input for ON. Drive SEL high for active-high enable. Drive SEL low for active-low enable. —— EP Exposed Pad. Internally connected to GND. Connect to a large ground plane with multiple vias to manage thermal performance. Not intended as an electrical connection point. |
Similar Part No. - MAX1562_10 |
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Similar Description - MAX1562_10 |
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