Ultralow Noise, 200 A, CMOS Linear Regulator

The ADP151 is an ultralow noise, low dropout (LDO) linear regulator that operates from 2.2 V to 5.5 V and provides up to 200 mA of output current. The low 135 mV dropout voltage at 200 mA load improves efficiency and allows operation over a wide input voltage range.

Using an innovative circuit topology, the ADP151 achieves ultralow noise performance without the necessity of a bypass capacitor, making the device ideal for noise-sensitive analog and RF applications. The ADP151 also achieves ultralow noise performance without compromising the power supply rejection ratio (PSRR) or transient line and load performance. The low 265 μA of operating supply current at 200 mA load makes the ADP151 suitable for battery-operated portable equipment.

The ADP151 also includes an internal pull-down resistor on the EN input.

The ADP151 is specifically designed for stable operation with tiny 1 μF, ±30% ceramic input and output capacitors to meet the requirements of high performance, space constrained applications.

The ADP151 is capable of 16 fixed output voltage options, ranging from 1.1 V to 3.3 V.

Short-circuit and thermal overload protection circuits prevent damage in adverse conditions. The ADP151 is available in tiny 5-lead TSOT, 6-lead LFCSP, and 4-ball, 0.4 mm pitch, halide-free WLCSP packages for the smallest footprint solution to meet a variety of portable power application requirements.

APPLICATIONS

* RF, voltage controlled oscillator (VCO), and phase locked loop (PLL) power supplies

* Mobile phones

* Digital camera and audio devices

* Portable and battery-powered equipment

* Post dc-to-dc regulation

* Portable medical devices

* Automotive

* Ultralow noise: 9 μV rms

* No noise bypass capacitor required

* Stable with 1 μF ceramic input and output capacitors

* Maximum output current: 200 mA

* Input voltage range: 2.2 V to 5.5 V

* Low quiescent current

* IGND = 10 μA with IOUT = 0 μA

* IGND = 265 μA with IOUT = 200 mA

* Low shutdown current: <1 μA

* Low dropout voltage: 135 mV at IOUT = 200 mA

* Initial accuracy: ±1%

* Accuracy over line, load, and temperature: ±2.5%

* 16 fixed output voltage options: 1.1 V to 3.3 V

* PSRR performance of 70 dB at 10 kHz

* Current-limit and thermal overload protection

* Logic controlled enable

* Internal pull-down resistor on EN input

* 5-lead TSOT package

* 6-lead LFCSP package

* 4-ball, 0.4 mm pitch WLCSP

* AEC-Q100 qualified for automotive applications