LTC1773
PRODUCTIONSynchronous Step-Down DC/DC Controller
- Part Models
- 2
- 1ku List Price
- Starting From $3.99
Overview
- High Efficiency: Up to 95%
- Constant Frequency 550kHz Operation
- VIN from 2.65V to 8.5V
- VOUT from 0.8V to VIN
- OPTI-LOOP® Compensation Minimizes COUT
- Synchronizable up to 750kHz
- Selectable Burst Mode Operation
- Low Quiescent Current: 80µA
- Low Dropout Operation: 100% Duty Cycle
- Secondary Winding Regulation
- Soft-Start
- Current Mode Operation for Excellent Line and Load Transient Response
- Low Quiescent Current: 80µA
- Low Shutdown IQ = 10µA
- ±1.5% Reference Accuracy
- Precision 2.5V Undervoltage Lockout
- Available in 10-Lead MSOP
The LTC1773 is a current mode synchronous buck regulator controller that drives external complementary power MOSFETs using a fixed frequency architecture. The operating supply range is from 2.65V to 8.5V, making it suitable for 1- or 2-cell lithium-ion battery powered applications. Burst Mode® operation provides high efficiency at low load currents. 100% duty cycle provides low dropout operation which extends operating time in battery-operated systems.
The operating frequency is internally set at 550kHz, allowing the use of small surface mount inductors. For switching-noise sensitive applications, it can be synchronized up to 750kHz. Peak current limit is user programmable with an external high side sense resistor. A SYNC/FCB control pin guarantees regulation of secondary windings regardless of load on the main output by forcing continuous operation. Burst Mode operation is inhibited during synchronization or when the SYNC/FCB pin is pulled low to reduce noise and RF interference. Soft-start is provided by an external capacitor.
Synchronous rectification increases efficiency and eliminates the need for a Schottky diode, saving components and board space. The LTC1773 comes in a 10-lead MSOP package.
Applications
- Cellular Telephones
- RF PA Supply
- Portable Instruments
- Wireless MODEMS
- Distributed Power Systems
- Notebook and Palm Top Computers, PDAs
- Single and Dual Cell Lithium-Ion Powered Devices
Documentation
Data Sheet 1
User Guide 2
Design Note 2
Technical Articles 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 |
|---|---|---|---|
| LTC1773EMS#PBF | 10-Lead MSOP | ||
| LTC1773EMS#TRPBF | 10-Lead MSOP |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Jun 5, 2024 - 24_0004 Epoxy Change from Henkel 8290 to 8290A for MSOP (3) |
||
| LTC1773EMS#PBF | PRODUCTION | |
| LTC1773EMS#TRPBF | PRODUCTION | |
|
Feb 4, 2020 - 20_0130 Laser Top Mark Conversion for 10-Lead MSOP Packages Assembled in ADPG and UTAC |
||
| LTC1773EMS#PBF | PRODUCTION | |
| LTC1773EMS#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
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Tools & Simulations
LTspice
Models for the following parts are available in LTspice:
- LTC1773
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
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