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ISL9000AIRBBZ Datasheet(PDF) 10 Page - Intersil Corporation |
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ISL9000AIRBBZ Datasheet(HTML) 10 Page - Intersil Corporation |
10 / 12 page 10 FN6391.1 March 11, 2008 Block Diagram Functional Description The ISL9000A contains two high performance LDO’s. High performance is achieved through a circuit that delivers fast transient response to varying load conditions. In a quiescent condition, the ISL9000A adjusts its biasing to achieve the lowest standby current consumption. The device also integrates current limit protection, smart thermal shutdown protection, staged turn-on and soft-start. Smart thermal shutdown protects the device against overheating. Staged turn-on and soft-start minimize start-up input current surges without causing excessive device turn-on time. Power Control The ISL9000A has two separate enable pins (EN1 and EN2) to individually control power to each of the LDO outputs. When both EN1 and EN2 are low, the device is in shutdown mode. During this condition, all on-chip circuits are off, and the device draws minimum current, typically less than 0.1µA. When one or both of the enable pins are asserted, the device first polls the output of the UVLO detector to ensure that VIN voltage is at least about 2.1V. Once verified, the device initiates a start-up sequence. During the start-up sequence, trim settings are first read and latched. Then, sequentially, the bandgap, reference voltage and current generation circuitry power-up. Once the references are stable, a fast-start circuit quickly charges the external reference bypass capacitor (connected to the CBYP pin) to the proper operating voltage. After the bypass capacitor has been charged, the LDOs power-up in their specified sequence. Soft-start circuitry integrated into each LDO limits the initial ramp-up rate to about 30µs/V to minimize current surge. VO2 LDO ERROR AMPLIFIER IS1 1V QEN1 LDO-1 LDO-2 POR COMPARATOR VOK1 POR1 VREF TRIM VIN VO1 VO2 POR2 POR1 GND EN2 EN1 CONTROL LOGIC POR2 DELAY POR1 DELAY VOLTAGE REFERENCE GENERATOR BANDGAP AND TEMPERATURE SENSOR UVLO VOK2 VOK1 1.00V 0.94V 0.90V VO1 VO2 CPOR CBYP VO1 ~1.0V VOK2 POR2 ISL9000A |
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