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ISL9012IRJCZ Datasheet(PDF) 9 Page - Intersil Corporation |
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ISL9012IRJCZ Datasheet(HTML) 9 Page - Intersil Corporation |
9 / 11 page 9 FN9220.2 May 8, 2006 Block Diagram Functional Description The ISL9012 contains all circuitry required to implement 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 ISL9012 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 ISL9012 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 0.1 μA. 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 LDO’s power up. If EN1 is brought high, and EN2 goes high before the VO1 output stabilizes, the ISL9012 delays the VO2 turn-on until the VO1 output reaches its target level. If EN2 is brought high, and EN1 goes high before VO2 starts its output ramp, then VO1 turns on first and the ISL9012 LDO ERROR AMPLIFIER IS2 1V QEN2 LDO-2 LDO-1 POR COMPARATOR VOK2 POR VREF TRIM VIN VO1 VO2 POR CPOR CBYP GND EN2 EN1 CONTROL LOGIC POR DELAY VOLTAGE REFERENCE GENERATOR BANDGAP AND TEMPERATURE SENSOR UVLO VOK2 1.00V 0.94V 0.90V VO2 ~1.0V ISL9012 |
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