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 MAX8840ELT18 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 MAX8840ELT18 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.
Feature
- 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
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
