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MAX8840：Ultra-Low-Noise, High PSRR, Low-Dropout, 150mA Linear Regulators in µDFN

Ultra-Low-Noise, Low-Dropout, 150mA Linear Regulator Requires Only 3.9mm2 Total Solution Size without Compromising Performance

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.

Key Features 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

MAX8840, MAX8841, MAX8842: Typical Operating Circuit Applications/Uses 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

DataSheet

Parametrics

Quality and Environmental Data

• MAX8840.pdf

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