LTC3548A - Dual Synchronous 400mA/800mA, 2.25MHz Step-Down DC/DC Regulator
Features
- High Efficiency: Up to 95%
- Low Ripple (<35mVP-P) Burst Mode Operation;
IQ = 40μA - 2.25MHz Constant Frequency Operation
- High Switch Current: 0.7A and 1.2A
- No Schottky Diodes Required
- Low RDS(ON) Internal Switches: 0.35Ω
- Current Mode Operation for Excellent Line and Load Transient Response
- Short-Circuit Protected
- Low Dropout Operation: 100% Duty Cycle
- Ultralow Shutdown Current: IQ <1μA
- Output Voltages from 5V down to 0.6V
- Power-On Reset Output
- Externally Synchronizable Oscillator
- Optional External Soft-Start
- Small Thermally Enhanced MSOP and 3mm × 3mm DFN Packages
AEC-Q100 data available for specific packages
Typical Application
Description
The LTC®3548A is a dual, constant frequency, synchronous step-down DC/DC converter. Intended for low power applications, it operates from a 2.5V to 5.5V input voltage range and has a constant 2.25MHz switching frequency, enabling the use of tiny, low cost capacitors and inductors 1mm or less in height. Each output voltage is adjustable from 0.6V to 5V. Internal synchronous 0.35Ω, 0.7A/1.2A power switches provide high efficiency without the need for external Schottky diodes.
A user-selectable mode input is provided to allow the user to trade-off ripple noise for low power efficiency. Burst Mode® operation provides the highest efficiency at light loads, while pulse-skipping mode provides the lowest ripple noise at light loads.
To further maximize battery life, the P-channel MOSFETs are turned on continuously in dropout (100% duty cycle), and both channels draw a total quiescent current of only 40μA. In shutdown, the device draws <1μA.
| Features | |
| LTC3548A | Improved Burst Mode, Improved ESD, 2 Adjustable Outputs |
| LTC3548-2 | One Fixed 1.8V Output, 1 Adjustable |
| LTC3548-1 | Fixed 1.8V and 1.575V Outputs |
| LTC3548 | 2 Adjustable Outputs |
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 |
|---|---|---|---|---|---|
| LTC3548AEDD#PBF | 3x3 DFN-10 | DD | E | 05-08-1699 | Yes |
| LTC3548AEDD#TRPBF | 3x3 DFN-10 | DD | E | 05-08-1699 | Yes |
| LTC3548AEMSE#PBF | MS-10E | MSE | E | 05-08-1664 | Yes |
| LTC3548AEMSE#TRPBF | MS-10E | MSE | E | 05-08-1664 | Yes |
| LTC3548AIDD#PBF | 3x3 DFN-10 | DD | I | 05-08-1699 | Yes |
| LTC3548AIDD#TRPBF | 3x3 DFN-10 | DD | I | 05-08-1699 | Yes |
| LTC3548AIMSE#PBF | MS-10E | MSE | I | 05-08-1664 | Yes |
| LTC3548AIMSE#TRPBF | MS-10E | MSE | I | 05-08-1664 | 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 | |
|---|---|---|---|---|---|---|
| LTC3548AEDD#PBF | 3x3 DFN-10 | E | $3.71 | $2.60 | Yes | |
| LTC3548AEDD#TRPBF | 3x3 DFN-10 | E | $2.66 | Yes | ||
| LTC3548AEMSE#PBF | MS-10E | E | $3.71 | $2.60 | Yes | |
| LTC3548AEMSE#TRPBF | MS-10E | E | $2.66 | Yes | ||
| LTC3548AIDD#PBF | 3x3 DFN-10 | I | $4.27 | $2.99 | Yes | |
| LTC3548AIDD#TRPBF | 3x3 DFN-10 | I | $3.05 | Yes | ||
| LTC3548AIMSE#PBF | MS-10E | I | $4.27 | $2.99 | Yes | |
| LTC3548AIMSE#TRPBF | MS-10E | I | $3.05 | 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.Click here to view our complete list of demo boards
Designed for Automotive and Transportation Applications
AEC-Q100 data is available for these specific part numbers. Please contact your local sales representative for more information regarding reliability reports or to inquire about parts that are not included. For more information, view our Automotive and Transportation page
| Part Number | Package | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LTC3548AIDD#PBF | 3x3 DFN-10 | I | $4.27 | $2.99 | Yes | |
| LTC3548AIDD#TRPBF | 3x3 DFN-10 | I | $3.05 | Yes | ||
| LTC3548AIMSE#PBF | MS-10E | I | $4.27 | $2.99 | Yes | |
| LTC3548AIMSE#TRPBF | MS-10E | I | $3.05 | Yes | ||
| Buy Now • Request Samples | ||||||
Applications
- PDAs/Palmtop PCs
- Digital Cameras
- Cellular Phones
- Wireless and DSL Modems
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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:
LTC3548
LTC3548-1
LTC3548A
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.
