The LTC3252 is a DC/DC converter from Linear Technology that uses switched capacitor fractional conversion to achieve a typical efficiency increase of 50% over that of a linear regulator. The part has no inductors and uses a unique constant frequency, spread spectrum architecture to provide a very low noise regulated output as well as low noise at the input. The part also has Burst Mode ® operation to provide high efficiency at low output currents, as well as ultralow current shutdown. Low operating currents (60µA with both outputs enabled, 35µA with one output enabled) and low external parts count make the LTC3252 ideally suited for space-con- strained battery-powered applications. The part is short- circuit and overtemperature protected and is available in a tiny 4mm × 3mm 12-pin DFN package.
The LTC3252 provides a dual, low‑noise, inductorless step‑down conversion from a 2.7 V to 5.5 V input to two independently adjustable regulated outputs. It features spread‑spectrum switching, burst‑mode operation for high efficiency at light loads, and built‑in short‑circuit and over‑temperature protection.
The device is offered in a 12‑lead plastic DFN package (4 mm × 3 mm) and is suited for space‑constrained, battery‑powered applications such as handheld electronics and cellular phones. Detailed pin functions, electrical characteristics, and recommended external components are provided for designers.
| Input Voltage Range | 2.7 V to 5.5 V |
|---|---|
| Output Current per Output | 250 mA |
| Low Operating Current | 60 µA typ |
| Shutdown Current | 0.01 pA typ |
| Package | 12‑Lead Plastic DFN (4 mm × 3 mm) |
Typical efficiency is about 50 % higher than that of linear regulators (LDOs).
The LTC3252 provides two adjustable independent regulated outputs.
The shutdown current is specified as 0.01 pA typ.
The maximum operating voltage is 5.5 V.