Features

• Wide Input Voltage Range: 0.9V to 5.5V
• Stable with Ceramic Capacitors
• Very Low Dropout: 85mV at 500mA
• Adjustable Output Range: 0.4V to 3.6V (LTC3025-1)
• Fixed Output: 1.2V(LTC3025-2), 1.5V(LTC3025-3), 1.8V(LTC3025-4)
• ±2% Voltage Accuracy over Temperature, Supply and Load
• Low Noise: 80μV_RMS (10Hz to 100kHz)
• BIAS Voltage Range: 2.5V to 5.5V
• Fast Transient Recovery
• Shutdown Disconnects Load from V_IN and V_BIAS
• Low Operating Current: I_IN = 4μA, I_BIAS = 50μA Typ
• Low Shutdown Current: I_IN = 1μA, I_BIAS = 0.01μA Typ
• Output Current Limit
• Thermal Overload Protection
• Available in 6-Lead (2mm × 2mm) DFN Package

Typical Application

Description

The LTC®3025-X is a micropower, VLDO™ (very low dropout) linear regulator which operates from input voltages as low as 0.9V. The device is capable of supplying 500mA of output current with a typical dropout voltage of only 85mV. A BIAS supply is required to run the internal reference and LDO circuitry while output current comes directly from the IN supply for high efficiency regulation. The LTC3025-1 features an adjustable output with a low 0.4V reference while the LTC3025-2, LTC3025-3, and LTC3025-4 have fixed 1.2V, 1.5V and 1.8V output voltages respectively.

The LTC3025-X’s low quiescent current makes it an ideal choice for use in battery-powered systems. For 3-cell NiMH and single cell Li-Ion applications, the BIAS voltage can be supplied directly from the battery while the input can come from a high efficiency buck regulator, providing a high efficiency, low noise output.

Other features include high output voltage accuracy, excellent transient response, stability with ultralow ESR ceramic capacitors as small as 1μF, short-circuit and thermal overload protection and output current limiting. The LTC3025-X is available in a tiny, low profile (0.75mm) 6-lead DFN (2mm × 2mm) package.