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Dual LDO with Low Noise, Very High PSRR and Low IQ

ISL9000A is a high performance dual LDO capable of sourcing 300mA current from each output. It has a low standby current and very high PSRR and is stable with output capacitance of 1?F to 10?F with ESR of up to 200m¦¸.

The device integrates an individual Power-On-Reset (POR) function for each output. The POR delay for VO2 can be externally programmed by connecting a timing capacitor to the CPOR pin. The POR delay for VO1 is internally fixed at approximately 2ms. A reference bypass pin is also provided for connecting a noise filtering capacitor for low noise and high-PSRR applications.

Features

? Integrates two 300mA high performance LDOs

? Excellent transient response to large current steps

? ¡À1.8 accuracy over all operating conditions

? Excellent load regulation: < 0.1 voltage change across full range of load current

? Low output noise: typically 30?VRMS @ 100?A (1.5V)

? Very high PSRR: 90dB @ 1kHz

? Extremely low quiescent current: 42?A (both LDOs active)

? Wide input voltage capability: 2.3V to 6.5V

? Low dropout voltage: typically 200mV @ 300mA

? Stable with 1?F to 10?F ceramic capacitors

? Separate enable and POR pins for each LDO

? Soft-start and staged turn-on to limit input current surge during enable

? Current limit and overheat protection

? Tiny 10 Ld 3mmx3mm DFN package

? -40¡ãC to +85¡ãC operating temperature range

? Pb-free (RoHS compliant)

Applications

? PDAs, Cell Phones and Smart Phones

? Portable Instruments, MP3 Players

? Handheld Devices including Medical Handheld