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ADM1270CP-EVALZ Datasheet(PDF) 6 Page - Analog Devices |
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ADM1270CP-EVALZ Datasheet(HTML) 6 Page - Analog Devices |
6 / 21 page ADM1270 Data Sheet Rev. A | Page 6 of 21 PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS 12 PWRGD NOTES 1. THE EXPOSED PAD IS LOCATED ON THE UNDERSIDE OF THE LFCSP PACKAGE. SOLDER THE EXPOSED PAD TO THE PRINTED CIRCUIT BOARD (PCB) TO IMPROVE THERMAL DISSIPATION. THE EXPOSED PAD CAN BE CONNECTED TO GROUND. 11 FLB 10 FB_PG 9 TIMER_OFF VCAP 1 UV 3 OV 4 ISET 2 ADM1270 TOP VIEW Figure 2. 16-Lead LFCSP Pin Configuration Table 4. 16-Lead LFCSP Pin Function Descriptions Pin No. Mnemonic Description 1 VCAP Internal Regulated Supply. Place a capacitor with a 1 µF or greater value on this pin to maintain good accuracy. This pin can be used as a reference to program the ISET pin voltage. 2 ISET Current Limit. This pin allows the current-limit threshold to be programmed. The default limit is set when this pin is connected directly to VCAP. To achieve a user defined sense voltage, the current limit can be adjusted using a resistor divider from VCAP. An external reference can also be used. 3 UV Undervoltage Input Pin. An external resistor divider is connected from the supply to this pin to allow an internal comparator to detect whether the supply is under the UV limit. 4 OV Overvoltage Input Pin. An external resistor divider is connected from the supply to this pin to allow an internal comparator to detect whether the supply is above the OV limit. 5 ENABLE Enable Pin. This pin is a digital logic input. This input must be high to allow the ADM1270 controller to begin a power-up sequence. If this pin is held low, the ADM1270 is prevented from powering up. There is no internal pull- up on this pin. 6 FAULT Fault Output. This pin indicates that the device has shut down due to an overcurrent fault condition. The device can be configured for automatic retry after shutdown by connecting this pin directly to the ENABLE pin. 7 GND Ground Pin. 8 TIMER Timer Pin. An external capacitor, CTIMER, sets an SOA overcurrent fault delay. The GATE pin is pulled off when the voltage on the TIMER pin exceeds the upper threshold. 9 TIMER_OFF Timer Off Pin. An external capacitor, CTIMER_OFF, sets an initial timing cycle delay and the SOA off time delay. After an SOA overcurrent fault has occurred, the GATE pin is pulled off until the voltage on the TIMER_OFF pin exceeds the threshold. 10 FB_PG PWRGD Feedback Input Pin. An external resistor divider is connected from the output voltage to this pin to allow an internal comparator to detect when the output voltage is above the PWRGD threshold. 11 FLB Foldback Pin. A foldback resistor divider is placed from the source of the FET to this pin. Foldback reduces the current limit when the source voltage drops. The foldback feature ensures that the power through the FET is not increased beyond the SOA limits. 12 PWRGD Power-Good Signal. This signal indicates that the supply is within tolerance. This signal is based on the voltage present on the FB_PG pin. 13 GATE Gate Output Pin. This pin is the gate drive of an external P-channel FET. This pin is driven by the FET drive controller, which provides a pull-down current to charge the FET gate pin. The FET drive controller regulates to a maximum load current by regulating the GATE pin. GATE is held off when the supply is below the undervoltage lockout (UVLO). 14 SENSE− Negative Current Sense Input Pin. A sense resistor between the VCC/SENSE+ pin and the SENSE− pin sets the analog current limit. The hot swap operation of the ADM1270 controls the external FET gate to maintain the sense voltage (VSENSE+ − VSENSE−). This pin also connects to the FET drain pin. |
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