LTC3809-1
PRODUCTIONNo RSENSE™, Low Input Voltage, Synchronous DC/DC Controller with Output Tracking
- Part Models
- 8
- 1ku List Price
- Starting From $3.82
Overview
- Programmable Output Voltage Tracking
- No Current Sense Resistor Required
- Constant Frequency Current Mode Operation for Excellent Line and Load Transient Response
- Wide VIN Range: 2.75V to 9.8V
- Wide VOUT Range: 0.6V to VIN
- 0.6V ±1.5% Reference
- Low Dropout Operation: 100% Duty Cycle
- Selectable Burst Mode®/Pulse-Skipping/Forced Continuous Operation
- Auxiliary Winding Regulation
- Internal Soft-Start Circuitry
- Selectable Maximum Peak Current Sense Threshold
- Output Overvoltage Protection
- Micropower Shutdown: IQ = 9µA
- Tiny Thermally Enhanced Leadless (3mm × 3mm) DFN or 10-lead MSOP Packages
The LTC3809-1 is a synchronous step-down switching regulator controller that drives external complementary power MOSFETs using few external components. The constant frequency current mode architecture with MOSFET VDS sensing eliminates the need for a current sense resistor and improves efficiency.
Optional Burst Mode operation provides high efficiency operation at light loads. 100% duty cycle provides low dropout operation, extending operating time in battery-powered systems. Burst Mode is inhibited when the MODE pin is pulled low to reduce noise and RF interference.
The LTC3809-1 allows either coincident or ratiometric output voltage tracking. Switching frequency is fixed at 550kHz. Fault protection is provided by an overvoltage comparator and a short-circuit current limit comparator.
The LTC3809-1 is available in tiny footprint thermally enhanced DFN and 10-lead MSOP packages.
| Features | Package | |
| LTC3809 | PLL, Selectable Spread Spectrum, Power Good | 3x3 DFN-10, MS-10E |
| LTC3809-1 | Tracking | 3x3 DFN-10, MS-10E |
| LTC3808 | PLL, Selectable Spread Spectrum, Tracking, Power Good | 4x3 DFN-14, SSOP-16 |
Applications
- 1- or 2-Cell Lithium-Ion Powered Devices
- Notebook and Palmtop Computers, PDAs
- Portable Instruments
- Distributed DC Power Systems
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 |
|---|---|---|---|
| LTC3809EDD-1#PBF | 10-Lead DFN (3mm x 3mm w/ EP) | ||
| LTC3809EDD-1#TRPBF | 10-Lead DFN (3mm x 3mm w/ EP) | ||
| LTC3809EMSE-1#PBF | 10-Lead MSOP w/ EP | ||
| LTC3809EMSE-1#TRPBF | 10-Lead MSOP w/ EP | ||
| LTC3809IDD-1#PBF | 10-Lead DFN (3mm x 3mm w/ EP) | ||
| LTC3809IDD-1#TRPBF | 10-Lead DFN (3mm x 3mm w/ EP) | ||
| LTC3809IMSE-1#PBF | 10-Lead MSOP w/ EP | ||
| LTC3809IMSE-1#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) |
||
| LTC3809EMSE-1#PBF | PRODUCTION | |
| LTC3809EMSE-1#TRPBF | PRODUCTION | |
| LTC3809IMSE-1#PBF | PRODUCTION | |
| LTC3809IMSE-1#TRPBF | PRODUCTION | |
|
Feb 4, 2020 - 20_0130 Laser Top Mark Conversion for 10-Lead MSOP Packages Assembled in ADPG and UTAC |
||
| LTC3809EMSE-1#PBF | PRODUCTION | |
| LTC3809EMSE-1#TRPBF | PRODUCTION | |
| LTC3809IMSE-1#PBF | PRODUCTION | |
| LTC3809IMSE-1#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 |
|---|---|---|
| Oscillators 2 | ||
| LTC6908 | Resistor Set SOT-23 Oscillator with Spread Spectrum Modulation | |
| LTC6909 | PRODUCTION | 1 to 8 Output, Multiphase Silicon Oscillator with Spread Spectrum Modulation |
| 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 2
- LTC3809-1 Demo Circuit - No Rsense, Low Input Voltage, Synchronous Controller with Output Tracking (3.3V to 1.8V @ 3A)
- LTC3809-1 - Step-Down (Buck) Regulators
Models for the following parts are available in LTspice:
- LTC3809
- LTC3809-1
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
LTC3809EDD-1 | Synchronous Step-Down Converter
Resources
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