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High-density claims for low-noise LDOs

Edited by the Electronicstalk editorial team Aug 3, 2005

Two new 150mA low-noise low-dropout regulators boast the highest available current density in the small five-pin SC-70 package.

Two new 150mA low-noise low-dropout (LDO) regulators boast the highest available current density in the small five-pin SC-70 package.

Their extremely small 2 x 2mm footprint makes them well suited for use in battery-powered equipment such as cellphones, PDAs, pagers, digital cameras, MP3 players, cable and DSL modems, and other noise-sensitive electronics.

Under a 150mA load condition, the SiP21101 and SiP21102 feature an extraordinarily low dropout of 130mV and a ground current of 110uA, helping to prolong battery life in low-voltage portable electronic systems.

Designed to maintain regulation while delivering 300mA peak current, the new ICs both feature a fast startup time of 50us, making them an excellent choice for systems that have a high surge current on turn-on.

15 fixed output voltage options ranging from 1.2 to 5.0V are available.

The SiP21101 can be used as a pin-for-pin replacement, with significantly improved current handling, for the MAX8510 and MIC5253.

An active pull-down circuit is built into the devices to clamp the output voltage when it rises beyond normal regulation, discharging it automatically by connecting the output to ground through a 100ohm N-channel MOSFET when the device is put in shutdown mode.

This provides better transient response and regulation.

Reverse battery protection limits the reverse current flow to approximately 1uA to prevent damage to the IC in the event that a reversed battery is applied at the input.

Short circuit and thermal protection are also built in.

The SiP21101 provides an extremely quiet voltage source because of an external noise bypass capacitor connected to its BP pin that reduces noise to only 30uV, a significant benefit for RF applications.

The same pin on the SiP21102, which has a noise output of 75uV, functions as an error flag output that goes low when the output voltage drops 4% below its normal voltage.

The SiP21101 and SiP21102 use low-cost ceramic capacitors or tantalum capacitors, giving designers a flexible choice of magnetic components.

Samples and production quantities are available now for most voltage options, with lead times of 6 to 8 weeks for larger orders.

Pricing is $0.40 each in 1000-piece quantities.