LTC3670 - Monolithic 400mA Buck Regulator with Dual 150mA LDOs in 3mm × 2mm DFN
Features
- 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 x 2mm x 0.75mm DFN Package
Typical Application
Description
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 x 2mm 12-lead DFN package.
Packaging
CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.
For complete and up to date package information and drawings, please refer to our packaging page
| Part Number | Package | Code | Temp | Package Drawing |
RoHS |
|---|---|---|---|---|---|
| LTC3670EDDB#PBF | 3x2 DFN-12 | DDB | E | 05-08-1723 | Yes |
| LTC3670EDDB#TRMPBF | 3x2 DFN-12 | DDB | E | 05-08-1723 | Yes |
| LTC3670EDDB#TRPBF | 3x2 DFN-12 | DDB | E | 05-08-1723 | Yes |
Order Info
- Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
- Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
- Please refer to our general ordering information or the product datasheet for more details
Package Variations and Pricing
| Part Number | Package | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LTC3670EDDB#PBF | 3x2 DFN-12 | E | $2.79 | Yes | ||
| LTC3670EDDB#TRMPBF | 3x2 DFN-12 | E | $2.79 | $2.00 | Yes | |
| LTC3670EDDB#TRPBF | 3x2 DFN-12 | E | $2.79 | $1.95 | Yes | |
| Buy Now • Request Samples | ||||||
Demo Boards
Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC1277A | 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 | $100.00 | |
| Buy Now | |||
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
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Design Tools
LTspice
LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice
Models for the following parts are available in LTspice:
LTC3670
Technical Support
- For immediate technical assistance, contact your local sales office or distributor or call 1-800-4-LINEAR (US customers only) or 408-432-1900.
- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.
