LP38691-ADJ/LP38693-ADJ 500mA Low Dropout CMOS Linear Regulators with Adjustable Output Stable with Ceramic Output Capacitors
The LP38691-ADJ and LP38693-ADJ are low‑dropout CMOS linear regulators that provide a precision 2 % adjustable reference voltage, extremely low dropout (250 mV @ 500 mA) and excellent AC performance with ultra‑low ESR ceramic output capacitors. They feature a PMOS power transistor, eliminating DC base‑drive current and keeping ground pin current below 100 pA.
Typical applications include hard‑disk drives, notebook computers, battery‑powered devices and portable instrumentation. The datasheet includes pin descriptions, ordering information, absolute maximum ratings, electrical characteristics, functional block diagrams, noise and ripple performance, and transient response graphs.
| Dropout Voltage (typical) | 250 mV @ 500 mA (5 V out) |
|---|---|
| Ground Pin Current (typical) | 55 pA at full load |
| Adjust Pin Voltage Accuracy | 2.0 % (25 °C) |
| Output Voltage Range | 1.25 V – 9 V |
| Input Voltage Range | 2.7 V – 10 V |
| Maximum Pin Voltage | -0.3 V to 12 V |
| Off‑State Quiescent Current | 1 A |
| Available Packages | SOT‑223, 6‑Lead LLP |
The typical dropout voltage is 250 mV when delivering 500 mA with a 5 V output.
The adjust pin voltage accuracy is 2.0 % at 25 °C.
They are available in SOT‑223 and 6‑Lead LLP packages.
The ground pin current is typically 55 pA at full load.