LTC3672B-2
PRODUCTIONMonolithic Fixed-Output 400mA Buck Regulator with Dual 150mA LDOs in 2mm × 2mm DFN
- Part Models
- 2
- 1ku List Price
- Starting From $2.97
Overview
- Triple Output Supply From a Single 2.9V to 5.5V Input
- Buck DC/DC: Fixed 1.2V Output, Up to 400mA
- LDO1: Fixed 2.8V Output, Up to 150mA
- LDO2: Fixed 1.8V Output, Up to 150mA
- ±2.5% Reference Accuracy
- Constant-Frequency 2.25MHz Operation
- Minimum External Component Count
- Current Mode Operation for Excellent Line and Load Transient Response
- Internal Soft-Start for Each Output
- Single Enable Pin Turns On/Shuts Down All Three Outputs
- Tiny 2mm × 2mm × 0.75mm DFN Package
The LTC3672B-2 is a triple power supply composed of a 400mA synchronous buck regulator and two 150mA low-dropout linear regulators (LDOs). Constant-frequency 2.25MHz operation is maintained down to very light loads. The input supply range of 2.9V to 5.5V is especially well-suited for single-cell Lithium-Ion and Lithium-Polymer applications, and for powering low voltage ASICs from 3.3V or 5V rails.
The LTC3672B-2 regulates 1.2V at the buck output, 2.8V at the LDO1 output, and 1.8V at the LDO2 output. External component count is minimal—all that is needed is a single inductor, an input capacitor, and output capacitors for each of the three outputs. Control loop compensation is internal to the LTC3672B-2.
The LTC3672B-2 is available in a 2mm × 2mm × 0.75mm 8-Lead DFN package.
| Buck VOUT | LDO 1 | LDO 2 | |
| LTC3672B-1 | 1.8V | 1.2V | 2.8V |
| LTC3672B-2 | 1.2V | 2.8V | 1.8V |
Applications
- DMB and DVB-H Cellphones
- Handheld Products (PDA, PMP, GPS)
- Multivoltage Power for Digital Logic, I/O, FPGAs, CPLDs, ASICs, 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 |
|---|---|---|---|
| LTC3672BEDC-2#TRMPBF | 8-Lead DFN (2mm x 2mm w/ EP) | ||
| LTC3672BEDC-2#TRPBF | 8-Lead DFN (2mm x 2mm w/ EP) |
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 |
|---|---|---|
| Power System Management (PSM) & Sequencers 1 | ||
| LTC2974 | RECOMMENDED FOR NEW DESIGNS | 4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement |
| 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 1
Models for the following parts are available in LTspice:
- LTC3672B-1
- LTC3672B-2
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
LTC3672BEDC-2 | Synch 400mA, 2.25MHz Step-Down DC/DC Regulator with Dual 150mA LDOs
Resources
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