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ISL9016IRUMWZ-T Datasheet(PDF) 9 Page - Intersil Corporation |
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ISL9016IRUMWZ-T Datasheet(HTML) 9 Page - Intersil Corporation |
9 / 11 page 9 FN6832.0 January 22, 2009 Block Diagram Functional Description ISL9016 contains two high performance LDO’s. High performance is achieved through a circuit which delivers fast transient response to varying load conditions. In a quiescent condition, the ISL9016 adjusts its biasing to achieve the lowest standby current consumption. The device also integrates current limit protection, thermal shutdown protection, reverse current protection and soft-start. Thermal shutdown protects the device against overheating. Soft-start limits the start-up input current surges. In some certain application circuits, the output voltage may be externally held up, meanwhile, the input voltage could be connected to ground, or connected to some voltage lower than the output side, or be left open circuit. ISL9016 features the reverse current protection; it can limit the current flow from output to input. This protection will automatically initiate when VOUT is detected to be higher than VIN. When VIN is pulled to ground and VOUT is held at 5.5V, the current flow from VOUT to VIN is typically less than 8µA. Enable Control The ISL9016 has two separate enable pins, EN1 and EN2, which independently enable/disable each of the LDO outputs. When both EN1 and EN2 are low, the whole device is in shutdown mode. In this condition, all on-chip circuits are off, and the device draws minimum current, typically less than 0.1mA. When one or both the EN pins go high, the LDO1 and/or LDO2 will be enabled accordingly based on the voltage signal applied on its related EN pin and start from the soft-start. Likewise, when one or both EN pins go low, LDO1 and/or LDO2 will be disabled based on the signal applied on its related EN pin. A 100k Ω (or above) pull-up resistor should be connected between ENx pin and the external control voltage (as shown in the “Typical Application Diagram” on page 8). LDO Protections ISL9016 offers several protections which make it ideal for using in battery-powered application circuits. ISL9016 provides short-circuit protection by limiting the output current to typical 265mA. When short circuit happens, the circuit is limited at 265mA (typical). If the short circuit lasts long enough, the die temperature increases, and the over-temperature protection circuit will turn off the output. When the die temperature reaches about +145°C, the thermal protection starts working. Under the overheat condition, only the LDO sourcing more than 50mA will be shut off. This does not affect the operation of the other LDO. If both LDOs source more than 50mA and an overheat condition occurs, both LDO outputs will be disabled. Once the die temperature falls back to about +110°C, the disabled LDO(s) are re-enabled and soft-start automatically takes place. In certain applications, the following input/output situations may occur: CONTROL LOGIC SHORT CIRCUIT THERMAL PROTECTION SOFT-START UNDERVOLTAGE LOCKOUT BANDGAP TEMP-SENSOR REFERENCE VOLTAGES VREF1 VREF2 VREF3 VOUT1 EN1 + VIN VIN EN1 EN2 VOUT2 VOUT1 GND VREF1 REVERSE CURRENT PROTECTION LDO-2 LDO-1 ISL9016 |
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