LTC3548 - Dual Synchronous, 400mA/800mA, 2.25MHz Step-Down DC/DC Regulator
Features
- High Efficiency: Up to 95%
- Very Low Quiescent Current: Only 40μA
- Low Output Ripple Burst Mode® Operation
- 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
- Small Thermally Enhanced MSOP and 3mm × 3mm DFN Packages
AEC-Q100 data available for specific packages
Typical Application
Description
The LTC®3548 is a dual, constant frequency, synchronous step down DC/DC converter. Intended for low power applications, it operates from 2.5V to 5.5V input voltage range and has a constant 2.25MHz switching frequency, allowing the use of tiny, low cost capacitors and inductors with a profile ≤1mm. 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 noise ripple for low power efficiency. Burst Mode operation provides high efficiency at light loads, while Pulse-Skipping Mode provides low noise ripple at light loads.
To further maximize battery runtime, 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 |
|---|---|---|---|---|---|
| LTC3548EDD#PBF | 3x3 DFN-10 | DD | E | 05-08-1699 | Yes |
| LTC3548EDD#TRPBF | 3x3 DFN-10 | DD | E | 05-08-1699 | Yes |
| LTC3548EMSE#PBF | MS-10E | MSE | E | 05-08-1664 | Yes |
| LTC3548EMSE#TRPBF | MS-10E | MSE | E | 05-08-1664 | Yes |
| LTC3548IDD#PBF | 3x3 DFN-10 | DD | I | 05-08-1699 | Yes |
| LTC3548IDD#TRPBF | 3x3 DFN-10 | DD | I | 05-08-1699 | Yes |
| LTC3548IMSE#PBF | MS-10E | MSE | I | 05-08-1664 | Yes |
| LTC3548IMSE#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 | |
|---|---|---|---|---|---|---|
| LTC3548EDD#PBF | 3x3 DFN-10 | E | $3.71 | $2.60 | Yes | |
| LTC3548EDD#TRPBF | 3x3 DFN-10 | E | $2.66 | Yes | ||
| LTC3548EMSE#PBF | MS-10E | E | $3.71 | $2.60 | Yes | |
| LTC3548EMSE#TRPBF | MS-10E | E | $2.66 | Yes | ||
| LTC3548IDD#PBF | 3x3 DFN-10 | I | $4.27 | $2.99 | Yes | |
| LTC3548IDD#TRPBF | 3x3 DFN-10 | I | $3.05 | Yes | ||
| LTC3548IMSE#PBF | MS-10E | I | $4.27 | $2.99 | Yes | |
| LTC3548IMSE#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.| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC822A | LTC3548EDD Demo Board | 2.5V ≤ VIN ≤ 5.5V, Vout1 = 1.2V1.5V/1.8V @ 800mA, Vout2 = 2.5V @ 400mA | Contact Factory | |
| Buy Now | |||
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 | |
|---|---|---|---|---|---|---|
| LTC3548IDD#PBF | 3x3 DFN-10 | I | $4.27 | $2.99 | Yes | |
| LTC3548IDD#TRPBF | 3x3 DFN-10 | I | $3.05 | Yes | ||
| LTC3548IMSE#PBF | MS-10E | I | $4.27 | $2.99 | Yes | |
| LTC3548IMSE#TRPBF | MS-10E | I | $3.05 | Yes | ||
| Buy Now • Request Samples | ||||||
Applications
- PDAs/Palmtop PCs
- Digital Cameras
- Cellular Phones
- Portable Media Players
- PC Cards
- Wireless and DSL Modems
People Who Viewed This Product Also Viewed
- LT1763 - 500mA, Low Noise, LDO Micropower Regulators
- LT1761 - 100mA, Low Noise, LDO Micropower Regulators in TSOT-23
- LT3757 - Boost, Flyback, SEPIC and Inverting Controller
- LTC3115-1 - 40V, 2A Synchronous Buck-Boost DC/DC Converter
- LT3471 - Dual 1.3A, 1.2MHz Boost/Inverter in 3mm × 3mm DFN
- LT3758 - High Input Voltage, Boost, Flyback, SEPIC and Inverting Controller
- LTC3891 - Low IQ, 60V Synchronous Step-Down Controller
- LT8610 - 42V, 2.5A Synchronous Step-Down Regulator with 2.5μA Quiescent Current
- LT3748 - 100V Isolated Flyback Controller
- LTC4365 - Overvoltage, Undervoltage and Reverse Supply Protection Controller
Product Notifications
Please login to your MyLinear account for notifications of datasheet updates, new document releases and LTspice model announcements for your favorite products. If you do not have a MyLinear account you may Sign Up Now.
Forgot your password? Click here.
Need help? Email mylinear@linear.com with questions and comments.
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
To launch a ready to run LTspice demonstration circuit for this part:
- Step 1: If you have not installed LTspice on this computer, download and install LTspice
- Step 2: Once LTspice is installed, click on the link(s) below to launch the simulation
- Step 3: If LTspice does not automatically open after clicking the link above, you can instead run the simulation by right clicking on the link and selecting "Save Target As." After saving the file to your computer, start LTspice and open the demonstration circuit by selecting 'Open' from the 'File' menu
To explore other ready to run LTspice demonstration circuits, please visit our Demo Circuits Collection.
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.
