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ADM1170-1AUJZ-RL7 Datasheet(PDF) 5 Page - Analog Devices |
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ADM1170-1AUJZ-RL7 Datasheet(HTML) 5 Page - Analog Devices |
5 / 16 page ADM1170 Rev. 0 | Page 5 of 16 PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS TIMER 1 GND 2 SS 3 ON 4 VCC 8 SENSE+ 7 SENSE– 6 GATE 5 ADM1170-1AUJ TOP VIEW (Not to Scale) Figure 2. Pin Configuration, 1AUJ Model ON-CLR TIMER 1 GND 2 SS 3 4 VCC 8 SENSE+ 7 SENSE– 6 GATE 5 ADM1170-2AUJ TOP VIEW (Not to Scale) Figure 3. Pin Configuration, 2AUJ Model Table 4. Pin Function Descriptions Pin No. Mnemonic Description 1 TIMER Timer Input Pin. The initial and circuit breaker timing cycles are set by this external capacitor. The initial timing delay is 272.9 ms/μF, and 21.7 ms/μF for a circuit breaker delay. When the TIMER pin is pulled beyond the upper threshold, the GATE turns off. 2 GND Chip Ground Pin. 3 SS Soft Start Pin. An external capacitor between the SS pin and GND sets the ramp rate of the current limit reference. 4 ON (ON-CLR) Input Pin. The ON (ON-CLR) pin is an input to a comparator that has a low-to-high threshold of 1.3 V with 80 mV hysteresis and a glitch filter. The ADM1170 is reset when the ON (ON-CLR) pin is low. When the ON (ON-CLR) pin is high, the ADM1170 is enabled. A rising edge on this pin has the added function of clearing a fault and restarting the device on the latched off model, the ADM1170-2. 5 GATE Gate Output Pin. An internal charge pump provides a 12 μA pull-up current to drive the gate of an N-channel MOSFET. In an overcurrent condition, the ADM1170 controls the external FET to maintain a constant load current. 6, 7 SENSE−, SENSE+ Current Limit Sense Input Pins. The current limit is set via a sense resistor between the SENSE+ and SENSE− pins. In an overcurrent condition, the gate of the FET is controlled to maintain the SENSE voltage at 50 mV. When this limit is reached, the TIMER circuit breaker mode is activated. The circuit breaker limit can be disabled by connecting the SENSE+ and SENSE− pins together. 8 VCC Positive Supply Input Pin. The ADM1170 operates between 2.7 V to 16.5 V. An undervoltage lockout (UVLO) circuit with a glitch filter resets the ADM1170 when the supply voltage drops below the specified UVLO limit. |
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