Features and Benefits
- Triple Output Supply from a Single 2.5V to 5.5V Input
- 400mA Buck DC/DC Plus Dual 150mA LDOs in One IC
- Outputs Regulate Down to 0.8V
- ±2.5% Reference Accuracy
- Constant-Frequency 2.25MHz Operation
- Burst Mode® Operation for High Efficiency at Light Loads; IQ = 70μA, All Outputs Enabled
- Independent Enable Pin for Each Output
- Current Mode Operation for Excellent Line and Load Transient Response
- Internal Soft-Start for Each Output
- Tiny 12-Lead 3mm × 2mm × 0.75mm DFN Package
The LTC3670 is a triple power supply composed of a 400mA synchronous buck regulator and two 150mA low dropout linear regulators (LDOs). The input supply range of 2.5V to 5.5V is especially well-suited for single-cell Lithium-Ion and Lithium-Ion/Polymer applications, and for powering low voltage ASICs and SoCs from 3V, 3.3V or 5V rails. Regulated output voltages are programmed via external resistors. Each output has its own enable pin for maximum flexibility.
The 400mA buck regulator features constant-frequency 2.25MHz operation, allowing small surface mount inductors and capacitors to be used. Burst Mode operation maintains high efficiency in light-load and no-load conditions. Internal control-loop compensation simplifies application design.
The LTC3670 is available in a 0.75mm profile, 3mm × 2mm 12-lead DFN package.
- Handheld Products
- Portable Instruments
- Single-Cell Li-Ion/Li-Polymer Powered Devices
- DMB/DVB-H Multimedia Cell Phones
- Multivoltage Power for Digital Logic, I/O, FPGAs, CPLDs, ASICs, SoCs, CPUs and RF Chipsets
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)
Demo Circuit 1277A is a demo board that features the LTC3670, a triple power supply composed of a 400mA synchronous buck regulator and two 150mA low dropout linear regulators (LDOs). The input supply range is 2.5V to 5.5V and it provides 1.2V @ 400mA, 2.8V @ 150mA and 3.3V @ 150mA. The output regulation of the LDOs is subject to the dropout requirements based on the supply voltage.
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.