MAX8840

 

Part Number	Replacement	Explanation

Description

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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 11µV_RMS 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.

MAX8840, MAX8841, MAX8842: Typical Operating Circuit Enlarge+

Key Features

• Space-Saving 1.0mm x 1.5mm x 0.8mm µDFN
• 11µV_RMS 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/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