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MAX1940EEE Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX1940EEE Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 12 page Detailed Description The MAX1940 triple current-limited USB power switch provides three independent switches, each with its own enable-control input and fault indicator (see Figure 1). A logic input sets the active polarity of the enable con- trol inputs. The fault indicators notify the system when the current-limit, short-circuit, undervoltage lockout, or thermal-shutdown threshold is exceeded. The MAX1940 operates from a 4V to 5.5V input supply and supplies a minimum output current of 700mA per channel. A built-in current limit of 0.9A (typ) limits the output current in the event of an overload condition. Built-in short-circuit detection pulses the output current if the output voltage falls below 1V, resulting in lower RMS output current and reduced power dissipation in the device. Independent thermal shutdown allows normal operation to continue if one channel experiences a pro- longed overload or short-circuit condition. Low-RON NMOS switches enable the MAX1940 to pro- vide three switches in the space-saving 16-pin QSOP package. An internal micropower charge pump gener- ates the high-side supply needed for driving the gates of these high-side switches. Separate current-limiting and thermal-shutdown circuitry permits each switch to operate independently, improving system robustness. Triple USB Switch with Autoreset and Fault Blanking 8 _______________________________________________________________________________________ FAULT LOGIC 20ms TIMERS THERMAL SHUTDOWN CHARGE PUMP SWITCH B (SEE SWITCH A) SWITCH C (SEE SWITCH A) BIAS REF UVLO OSC 25kHz 25mA ILIM SWITCH A (EXPANDED) IN2 IN_ FAULTA FAULTB FAULTC OUTC OUTA IN2 IN3 IN4 IN5 GND ONC ONB SEL IN1 ONA OUTB MAX1940 Figure 1. Functional Diagram |
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