The ZLDO Series low dropout linear regulators have an exceptionally low dropout voltage, typically only 30mV with a load current of 100mA. The regulator series features output voltages in the range 2.7 to 18 volts, and this device provides an output voltage of 4.85 volts. The ZLDO485 consumes a typical quiescent current of only 1mA and is rated to supply load currents up to 300mA. A battery low flag is available to indicate potential power fail situations. If the input voltage falls to within 200mV of the regulated output voltage, then the error output pulls low. The device also features an active high disable control. Once disabled, the ZLDO quiescent current falls to typically 11µA. The ZLDO devices are packaged in Zetex SM8 8 pin small outline surface mount package, ideal for applications where space saving is important. The device's low dropout voltage, low quiescent current, and small size make it ideal for low power and battery powered applications. Battery powered circuits can make particular use of the low battery flag and shutdown features.
The ZLDO485 is a low‑dropout linear regulator offering a fixed 4.85 V output. It features an exceptionally low dropout voltage (as low as 6 mV at 10 mA) and a typical quiescent current of 1 mA at full load. Additional functions include a low‑battery flag and a shutdown control that can reduce quiescent current to about 11 µA.
The device is supplied in an SM8 surface‑mount package and supports an input voltage range of 0.3 V to 20 V. Pin definitions provide a low‑battery flag (Pin 1), shutdown control (Pin 2), voltage input (Pin 3), and other standard pins. Typical applications are battery‑powered equipment, post‑converter regulation, logic‑controlled supplies, and over‑temperature shutdown protection.
| Fixed Output Voltage | 4.85 V |
|---|---|
| Dropout Voltage (10 mA) | 6 mV |
| Dropout Voltage (100 mA) | 30 mV |
| Dropout Voltage (300 mA) | 100 mV |
| Quiescent Current (300 mA load) | 1 mA typ |
| Input Voltage Range | 0.3 V to 20 V |
| Maximum Output Current | 300 mA |
| Operating Temperature Range | -40 °C to 85 °C |
| Maximum Power Dissipation | 2 W |
The typical quiescent current is 1 mA when the device supplies 300 mA.
The low‑battery flag output pulls low on an open‑collector transistor when the input voltage falls within about 200 mV of the regulated output.
Driving the shutdown control pin high disables the regulator, reducing quiescent current to roughly 11 µA.
The device can operate with an input voltage up to 20 V.