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 1µF to 10µF with ESR of up to 200mΩ.

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

• ±1.8 accuracy over all operating conditions

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

• Low output noise: typically 30µVRMS @ 100µA (1.5V)

• Very high PSRR: 90dB @ 1kHz

• Extremely low quiescent current: 42µA (both LDOs active)

• Wide input voltage capability: 2.3V to 6.5V

• Low dropout voltage: typically 200mV @ 300mA

• Stable with 1µF to 10µF 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°C to +85°C operating temperature range

• Pb-free (RoHS compliant)

Applications

• PDAs, Cell Phones and Smart Phones

• Portable Instruments, MP3 Players

• Handheld Devices including Medical Handheld