500mA Micropower VLDO Linear Regulators

The LTC3025-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.

Output Current

Output Voltage

LTC3025

300mA

Adj (0.4V to 3.6V)

LTC3025-1

500mA

Adj (0.4V to 3.6V)

LTC3025-2

500mA

1.2V Fixed

LTC3025-3

500mA

1.5V Fixed

LTC3025-4

500mA

1.8V Fixed

APPLICATIONS

* Low Power Handheld Devices

* Low Voltage Logic Supplies

* DSP Power Supplies

* Cellular Phones

* Portable Electronic Equipment

* Handheld Medical Instruments

* Post Regulator for Switching Supply Noise Rejection

* 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: 80μVRMS (10Hz to 100kHz)