LTC3670
PRODUCTIONMonolithic 400mA Buck Regulator with Dual 150mA LDOs in 3mm × 2mm DFN
- Part Models
- 2
- 1ku List Price
- Starting From $2.97
Overview
- 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
- Independent Enable Pin for Each Output
- Internal Soft-Start for Each Output
- See datasheet for additional features
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.
APPLICATIONS
- 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
Documentation
Data Sheet 1
User Guide 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 |
|---|---|---|---|
| LTC3670EDDB#TRMPBF | 12-Lead DFN (3mm x 2mm w/ EP) | ||
| LTC3670EDDB#TRPBF | 12-Lead DFN (3mm x 2mm w/ EP) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Feb 14, 2025 - 25_0017 Bond Wire Change from Gold to Copper |
||
| LTC3670EDDB#TRMPBF | PRODUCTION | |
| LTC3670EDDB#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
Can't find the software or driver you need?
Request a Driver/SoftwareHardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| Circuit Monitors 1 | ||
| LTC2960 | RECOMMENDED FOR NEW DESIGNS | 36V Nano-Current Two-Input Voltage Monitor |
| Power System Management (PSM) & Sequencers 1 | ||
| LTC2974 | RECOMMENDED FOR NEW DESIGNS | 4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement |
| Supervisory Circuits & Reset ICs 1 | ||
| LTC2934 | PRODUCTION | Ultra-Low Power Adjustable Supervisor with Power-Fail Output |
| Switching Regulators & Controllers 1 | ||
| LTC3880 | RECOMMENDED FOR NEW DESIGNS | Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management |
Tools & Simulations
LTspice
Models for the following parts are available in LTspice:
- LTC3670
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.
Evaluation Kits
LTC3670EDDB Demo Board | 2.25MHz, Buck Plus Two 150mA LDOs, 2.5V ≤ VIN ≤ 5.5V, VOUT1 = 1.2V @ 400mA, VOUT2 = 2.8V @ 150mA, VOUT3 = 3.3V @ 150mA
Resources
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