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Overview
Features and Benefits
- Ultra-High Efficiency: Over 95% Possible
- Current-Mode Operation for Excellent Line and Load Transient Response
- High Efficiency Maintained Over Three Decades of Output Current
- Low 160µA Standby Current at Light Loads
- Logic Controlled Micropower Shutdown: IQ <20µA
- Wide VIN Range: 3.5V to 20V
- Short-Circuit Protection
- Very Low Dropout Operation: 100% Duty Cycle
- Synchronous FET Switching for High Efficiency
- Adaptive Nonoverlap Gate Drives
- Output Can Be Externally Held High in Shutdown
- Available in 14-Pin Narrow SO Package
Product Details
The LTC1148 series is a family of synchronous stepdown switching regulator controllers featuring automatic Burst Mode™ operation to maintain high efficiencies at low output currents. These devices drive external complementary power MOSFETs at switching frequencies up to 250kHz using a constant off-time current-mode architecture providing constant ripple current in the inductor.
The operating current level is user-programmable via an external current sense resistor. Wide input supply range allows operation from 3.5V to 18V (20V maximum). Constant off-time architecture provides low dropout regulation limited by only the RDS(ON) of the external MOSFET and resistance of the inductor and current sense resistor.
The LTC1148 series combines synchronous switching for maximum efficiency at high currents with an automatic low current operating mode, called Burst Mode operation, which reduces switching losses. Standby power is reduced to only 2mW at VIN = 10V (at IOUT = 0). Load currents in Burst Mode operation are typically 0mA to 300mA.
For operation up to 48V input, see the LTC1149 and LTC1159 data sheets and Application Note 54.
Applications
- Notebook and Palmtop Computers
- Portable Instruments
- Battery-Operated Digital Devices
- Cellular Telephones
- DC Power Distribution Systems
- GPS Systems
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (3)
Documentation
Reliability Data (1)
Application Notes (4)
Design Notes (7)
Tools & Simulations
LTspice
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.
Models for the following parts are available in LTspice:
Design Resources
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.
Discussions
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Sample & Buy
The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
