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EP53F8QI Datasheet(PDF) 8 Page - Enpirion, Inc. |
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EP53F8QI Datasheet(HTML) 8 Page - Enpirion, Inc. |
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8 / 11 page  01542 4/3/2009 Rev:A EP53F8QI ©Enpirion 2009 all rights reserved, E&OE 8 www.enpirion.com Soft Start The internal soft start circuit limits inrush current when the device starts up from a power down condition or when the ENABLE pin is asserted “high”. Digital control circuitry sets the VOUT ramp rate to minimize input voltage ripple and inrush current to ensure a glitch-free start up. The soft start ramp rate can be found in the electrical characteristics table. Over Current/Short Circuit Protection When an over current condition occurs, VOUT is pulled low. This condition is maintained for a period of 1.2 ms and then a normal soft start cycle is initiated. If the over current condition still persists, this cycle will repeat. Under Voltage Lockout An under voltage lockout circuit will hold off switching during initial power up until the input voltage reaches sufficient level to ensure proper operation. If the voltage drops below the UVLO threshold the lockout circuitry will again disable switching. Hysteresis is included to prevent chattering between UVLO high and low states. Enable The ENABLE pin provides means to shut down the converter or initiate normal operation. A logic high will enable the converter to go through the soft start cycle and regulate the output voltage to the desired value. A logic low will allow the device to discharge the output and go into shutdown mode for minimal power consumption. When the output is discharged, an auxiliary NFET turns on and limits the discharge current to 300 mA or below. The ENABLE pin must not be left floating. Thermal Shutdown When excessive power is dissipated in the device, its junction temperature rises. Once the junction temperature exceeds the thermal shutdown temperature, the thermal shutdown circuit turns off the converter, allowing the device to cool. When the junction temperature decreases to a safe operating level, the device will be re-enabled and go through a normal startup process. The specific thermal shutdown junction temperature and hysteresis can be found in the thermal characteristics table Power OK The EP53F8QI provides an open drain output to indicate if the output voltage stays within 92% to 111% of the set value. Within this range, the POK output is allowed to be pulled high. Outside this range, POK remains low. However, during transitions such as power up, power down, and dynamic voltage scaling, the POK output will not change state until the transition is complete for enhanced noise immunity. The POK has 5 mA sink capability for events where it needs to feed a digital controller with standard CMOS inputs. When POK is pulled high, the pin leakage current is as low as 500 nA maximum over temperature. This allows a large pull up resistor such as 100 kΩ to be used for minimal current consumption in shutdown mode. The POK output can also be conveniently used as an ENABLE input of the next stage for power sequencing of multiple converters. |
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