FEATURES

• Input voltage 2 V to 6 V

• Low 150 mV dropout at 500 mA load

• Guaranteed 500 mA output current

• Uses low ESR ceramic output capacitor

• Fast load and line transient response

• Only 100 μVRMS noise with noise bypass capacitor

• 1 μA maximum shutdown current

• Built-in short circuit and thermal protection

• Out-of-regulation error flag (power good or POR)

• Fixed 1.215 V, 1.8 V, 2.5 V, 2.8 V, 3.0 V, 3.3 V, 5.0 V, or

adjustable output voltage options

• Other output voltages available by special order

• 1.1 W power dissipation

• Thin, thermally enhanced MLP33 PowerPAK® package

• Compliant to RoHS directive 2002/95/ECAPPLICATIONS

• Laptop and palm computers

• Desktop computers

• Cellular phones

• PDA, digital still cameras

DESCRIPTION

The Si9185 is a 500 mA CMOS LDO (low dropout) voltage

regulator. The device features ultra low ground current and

dropout voltage to prolong battery life in portable electronics.

The Si9185 offers line/load transient response and ripple

rejection superior to that of bipolar or BiCMOS LDO

regulators, and is designed to drive lower cost ceramic, as

well as tantalum, output capacitors. An external noise

bypass capacitor connected to the device’s CNOISE pin will

lower the LDO’s output noise for low noise applications. The

Si9185 also includes an out-of-regulation error flag. If a

capacitor is connected to the device’s delay pin, the error

flag output pin will generate a delayed power-on-reset

signal. The device is guaranteed stable from maximum load

current down to 0 mA load.

The Si9185 is available in both standard and lead (Pb)-free

MLP33 PowerPAK packages and is specified to operate

over the industrial temperature range of - 40 °C to 85 °C.

MLP33 PowerPAK packaging allows enhanced heat transfer

to the PC board.