The LTC1148 series is a family of synchronous step-down switching regulator controllers featuring high efficiency, current-mode operation, and low power consumption.
The LTC1148 series are high‑efficiency synchronous step‑down switching regulators that use a current‑mode, constant‑off‑time architecture. They offer ultrahigh efficiency (over 95 %), low standby current (as low as 160 µA), and automatic burst‑mode operation for optimal performance across a wide load range.
The document lists absolute maximum ratings, detailed electrical characteristics, typical performance curves, functional diagrams, and recommended external component selections. Package options include 14‑lead PDIP and 14‑lead plastic SOIC, and typical application circuits are provided for designers.
| Input Supply Voltage (Pin 3) – LTC1148 series | 16 V to –0.3 V |
|---|---|
| Continuous Output Current (Pins 1, 14) | 0 … 50 mA |
| Standby (Sleep) Current – typical | 160 µA |
| Efficiency | Over 95 % |
| Package – 14‑Lead PDIP (Narrow) | 14‑Lead PDIP (Narrow 0.300) |
Pin 4 (Cy) is the external timing capacitor pin that determines the operating frequency.
The shutdown current is typically 10 pA (up to 20 pA depending on voltage).