Features and Benefits
- 2.7V to 5.5V Input Voltage Range
- No Inductors
- Typical Efficiency 50% Higher than LDOs
- Spread Spectrum Operation
- Low Input and Output Noise
- Shutdown Disconnects Load from VIN
- Dual Adjustable Independent Outputs (Range: 0.9V to 1.6V)
- Output Current: 250mA Each Output
- Low Operating Current: IIN = 60µA Typ (35µA with One Output Enabled)
- Low Shutdown Current: IIN = 0.01µA Typ
- Soft-Start Limits Inrush Current at Turn On
- Short Circuit and Over Temperature Protected
- Available in 4mm x 3mm 12-Pin DFN Package
The LTC3252 is a switched capacitor step-down DC/DC converter that produces two adjustable regulated outputs from a single 2.7V to 5.5V input. The part uses switched capacitor fractional conversion to achieve a typical efficiency increase of 50% over that of a linear regulator. No inductors are required.
A unique constant frequency, spread spectrum architecture provides 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-constrained battery-powered applications. The part is shortcircuit and overtemperature protected and is available in a tiny 4mm x 3mm 12-pin DFN package.
- Handheld Electronic Devices
- Cellular Phones
- Low Voltage Logic Supplies
- DSP Power Supplies
- 3.3V to 1.5V Conversion
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
Demonstration circuit 611 is a dual, spread-spectrum, step-down charge pump DC/DC converter featuring the LTC3252EDE. It produces regulated 1.5V and 1.2V output voltages at up to 250mA of output current each, from a 2.7V to 5.5V input. The unique spread spectrum architecture of the LTC3252 provides highly efficient, low noise operation. The circuit has a low external parts count and requires only five small surface mount capacitors and four tiny surface mount resistors.
Tools & Simulations
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
Models for the following parts are available in LTspice:
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
Sample & Buy
The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.