Ultra-Low-Noise, High PSRR, Low-Dropout, 150mA Linear Regulators in µDFN

The MAX8840/MAX8841/MAX8842 ultra-low-noise, low-dropout (LDO) linear regulators are designed to deliver up to 150mA continuous output current. These regulators achieve a low 120mV dropout for 120mA load current. The MAX8840 uses an advanced architecture to achieve ultra-low output voltage noise of 11µVRMS and PSRR of 54dB at 100kHz.

The MAX8841 does not require a bypass capacitor, hence achieving the smallest PC board area. The MAX8842 output voltage can be adjusted with an external divider.

The MAX8840/MAX8841 are preset to a variety of voltages in the 1.5V to 4.5V range. Designed with a p-channel MOSFET series pass transistor, the MAX8840/MAX8841/MAX8842 maintain very low ground current (40µA).

The regulators are designed and optimized to work with low-value, low-cost ceramic capacitors. The MAX8840 requires only 1µF (typ) of output capacitance for stability with any load. When disabled, current consumption drops to below 1µA.

The MAX8840/MAX8841/MAX8842 are available in a tiny 1mm x 1.5mm x 0.8mm µDFN.

Applications

* Base Stations * Bluetooth® Portable Radios and Accessories * Cellular and Cordless Phones * Digital Cameras * PDA and Palmtop Computers * Personal Stereos * Portable and Battery-Powered Equipment * Wireless LANs

* Space-Saving 1.0mm x 1.5mm x 0.8mm µDFN

* 11µVRMS Output Noise at 100Hz to 100kHz Bandwidth (MAX8840)

* 78dB PSRR at 1kHz (MAX8840)

* 120mV Dropout at 120mA Load

* Stable with 1µF Ceramic Capacitor for Any Load

* Guaranteed 150mA Output

* Only Need Input and Output Capacitors (MAX8841)

* Output Voltages: 1.5V, 1.8V, 2.5V, 2.6V, 2.7V, 2.8V, 2.85V, 3V, 3.3V, 4.5V (MAX8840/MAX8841) and Adjustable (MAX8842)

* Low 40µA Ground Current

* Excellent Load/Line Transient

* Overcurrent and Thermal Protection