LTC3251
LTC3251
PRODUCTION500mA High Efficiency, Low Noise, Inductorless Step-Down DC/DC Converters
- Part Models
- 6
- 1ku List Price
- Starting From $3.29
Viewing:
Overview
- Up to 500mA Output Current
- No Inductors
- 2.7V to 5.5V Input Voltage Range
- 2x Efficiency Improvement Over LDOs
- 2-Phase, Spread Spectrum Operation for Low Input and Output Noise
- Shutdown Disconnects Load from VIN
- Adjustable Output Voltage Range: 0.9V to 1.6V
- Fixed Output Voltages: 1.2V, 1.5V
- Super Burst, Burst and Burst Defeat Operating Modes
- Low Operating Current: IIN = 35µA (Burst Mode® Operation)
- Super Burst Operating Current: IIN = 10µA
- Low Shutdown Current: IIN = 0.01µA Typ
- Soft-Start Limits Inrush Current at Turn-On
- Short-Circuit and Overtemperature Protected
- Available in a Thermally Enhanced 10-Pin MSOP Package
The LTC3251/LTC3251-1.2/LTC3251-1.5 are 2-phase charge pump step-down DC/DC converters that produce a regulated output from a 2.7V to 5.5V input. The parts use switched capacitor fractional conversion to achieve twice the typical efficiency of a linear regulator. No inductors are required. VOUT is resistor programmable from 0.9V to 1.6V or fixed at 1.2V or 1.5V, with up to 500mA of load current available.
A unique 2-phase spread spectrum architecture provides a very low noise regulated output as well as low noise at the input. The parts have four operating modes: Continuous Spread Spectrum, Spread Spectrum with Burst Mode operation, Super Burst™ mode operation and shutdown.
Low operating current (35µA in Burst Mode operation, 10µA in Super Burst mode operation) and low external parts count make the LTC3251/LTC3251-1.2/LTC3251-1.5 ideally suited for space-constrained battery-powered applications. The parts are short-circuit and over-temperature protected, and are available in a thermally enhanced 10-pin MSOP package.
Applications
- Handheld Devices
- Cellular Phones
- Portable Electronic Equipment
- DSP Power Supplies
Documentation
Data Sheet 1
User Guide 1
Design Note 1
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. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| LTC3251EMSE#PBF | 10-Lead MSOP w/ EP | ||
| LTC3251EMSE#TRPBF | 10-Lead MSOP w/ EP | ||
| LTC3251EMSE-1.2#PBF | 10-Lead MSOP w/ EP | ||
| LTC3251EMSE-1.2#TRPBF | 10-Lead MSOP w/ EP | ||
| LTC3251EMSE-1.5#PBF | 10-Lead MSOP w/ EP | ||
| LTC3251EMSE-1.5#TRPBF | 10-Lead MSOP w/ EP |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Jun 5, 2024 - 24_0003 Epoxy Change from Henkel 8290 to 8290A for MSOP Package (2) |
||
| LTC3251EMSE#PBF | PRODUCTION | |
| LTC3251EMSE#TRPBF | PRODUCTION | |
| LTC3251EMSE-1.2#PBF | PRODUCTION | |
| LTC3251EMSE-1.2#TRPBF | PRODUCTION | |
| LTC3251EMSE-1.5#PBF | PRODUCTION | |
| LTC3251EMSE-1.5#TRPBF | PRODUCTION | |
|
Feb 4, 2020 - 20_0130 Laser Top Mark Conversion for 10-Lead MSOP Packages Assembled in ADPG and UTAC |
||
| LTC3251EMSE#PBF | PRODUCTION | |
| LTC3251EMSE#TRPBF | PRODUCTION | |
| LTC3251EMSE-1.2#PBF | PRODUCTION | |
| LTC3251EMSE-1.2#TRPBF | PRODUCTION | |
| LTC3251EMSE-1.5#PBF | PRODUCTION | |
| LTC3251EMSE-1.5#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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LTspice
Models for the following parts are available in LTspice:
- LTC3251
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.
