20V, 500mA, Low Noise, CMOS LDO

The ADPL42005 is a complementary metal-oxide semiconductor (CMOS), low dropout linear regulator that operates from 4V to 20V and provides up to 500mA of output current. This high input voltage LDO is ideal for the regulation of high-performance analog and mixed‐signal circuits operating from 19V to 1.22V rails. Using an advanced proprietary architecture, it provides high power supply rejection, low noise, and achieves excellent line and load transient response with just a small 1μF ceramic output capacitor.

The ADPL42005 is available in six fixed output voltage options and an adjustable version, which allows output voltages that range from 1.22V to VIN − VDO through an external feedback divider.

The ADPL42005 output noise voltage is 32μVrms and is independent of the output voltage. A digital powergood output allows power system monitors to check the health of the output voltage. A user programmable precision undervoltage lockout function facilitates sequencing of multiple power supplies.

The ADPL42005 is available in 8-lead, 3 mm × 3 mm LFCSP and 8-lead SOIC packages (Figure 51 and Figure 52). The LFCSP offers a very compact solution and also provides excellent thermal performance for applications requiring up to 500mA of output current in a small, low-profile footprint.

APPLICATIONS

* Regulation to noise-sensitive applications: ADC, DAC

circuits, precision amplifiers, high-frequency oscillators, clocks, and PLLs

* Communications and infrastructure

* Medical and healthcare

* Industrial and instrumentation

* Input voltage range: 4V to 20V

* Maximum output current: 500mA

* Low noise: 32μVrms for fixed output versions

* PSRR performance of 58dB at 10kHz, VOUT = 3.3V

* Reverse current protection

* Low dropout voltage: 400mV at 500mA

* Initial accuracy: ±0.8

* Accuracy over line, load, and temperature

* −2% to +1%, TJ = −40°C to +125°C

* Low quiescent current (VIN = 10V), IGND = 900μA with 500 mA load