LTC1798 series micropower bandgap references combine high accuracy and low drift with very low supply current and small package size. The combination of ultralow quiescent current and low dropout voltage of only 200mV (max) makes them ideal for battery-powered equipment. The output voltage is set by an external resistor divider for the adjustable LTC1798. This series of references uses curvature compensation to obtain low temperature coefficient and trimmed thin-film resistors to achieve high output accuracy. These references can source up to 10mA and sink up to 2mA, making them ideal for precision regulator applications. They are stable without an output bypass capacitor, but are also stable with capacitance up to 1µF. This feature is important in critical applications where PC board space is a premium and fast settling is demanded. The LTC1798 series references provided power dissipa- tion advantages over shunt references. In addition to supply current, shunt references must also idle the entire load current to operate. The LTC1798 series is available in the SO-8 package.
The LTC1798 series from Linear Technology provides micropower bandgap references with low dropout (200 mV max at 10 mA) and ultra‑low quiescent current (4 µA typical). Available in 2.5 V, 3 V, 4.096 V, 5 V and adjustable versions, the devices can source up to 10 mA and sink 2 mA, making them suitable for battery‑powered instruments and precision regulators.
The datasheet includes electrical characteristics, absolute maximum ratings, pin functions, package information, and typical performance graphs. It also offers application guidance such as using output bypass capacitors up to 1 µF and the benefits of the internal P‑channel MOSFET pass transistor for low dropout operation.
| Maximum Dropout Voltage (10 mA load) | 200 mV |
|---|---|
| Typical Quiescent Current | 4 µA |
| Maximum Initial Accuracy | 0.15 % |
| Temperature Drift | 40 ppm/°C |
| Output Source Current | 10 mA |
| Output Sink Current | 2 mA |
| Voltage Options | 2.5 V, 3 V, 4.1 V, 5 V, Adjustable |
The maximum dropout voltage is 200 mV at a 10 mA load.
Typical quiescent current is 4 µA.
The device can source up to 10 mA and sink up to 2 mA.