LTC3548A
LAST TIME BUYDual Synchronous 400mA/800mA, 2.25MHz Step-Down DC/DC Regulator
- Part Models
- 8
- 1ku List Price
- Starting From $3.61
Overview
- 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
The LTC3548A 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 |
Applications
- PDAs/Palmtop PCs
- Digital Cameras
- Cellular Phones
- Wireless and DSL Modems
Documentation
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 |
|---|---|---|---|
| LTC3548AEDD#PBF | 10-Lead DFN (3mm x 3mm w/ EP) | ||
| LTC3548AEDD#TRPBF | 10-Lead DFN (3mm x 3mm w/ EP) | ||
| LTC3548AEMSE#PBF | 10-Lead MSOP w/ EP | ||
| LTC3548AEMSE#TRPBF | 10-Lead MSOP w/ EP | ||
| LTC3548AIDD#PBF | 10-Lead DFN (3mm x 3mm w/ EP) | ||
| LTC3548AIDD#TRPBF | 10-Lead DFN (3mm x 3mm w/ EP) | ||
| LTC3548AIMSE#PBF | 10-Lead MSOP w/ EP | ||
| LTC3548AIMSE#TRPBF | 10-Lead MSOP w/ EP |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Jun 18, 2019 - 19_0112 LTC3548A - Die Revision |
||
| LTC3548AEDD#PBF | ||
| LTC3548AEDD#TRPBF | ||
| LTC3548AEMSE#PBF | ||
| LTC3548AEMSE#TRPBF | ||
| LTC3548AIDD#PBF | ||
| LTC3548AIDD#TRPBF | ||
| LTC3548AIMSE#PBF | ||
| LTC3548AIMSE#TRPBF | ||
|
Oct 11, 2022 - 22_0244 Epoxy Change from Henkel 8290 to 8290A for MSOP Package |
||
| LTC3548AEMSE#PBF | ||
| LTC3548AEMSE#TRPBF | ||
|
Apr 18, 2022 - 22_0050 UTAC Thai Limited (UTL) as Alternate Assembly Site for MSOP Packages / Devices |
||
| LTC3548AEMSE#PBF | ||
| LTC3548AEMSE#TRPBF | ||
|
Feb 4, 2020 - 20_0130 Laser Top Mark Conversion for 10-Lead MSOP Packages Assembled in ADPG and UTAC |
||
| LTC3548AEMSE#PBF | ||
| LTC3548AEMSE#TRPBF | ||
| LTC3548AIMSE#PBF | ||
| LTC3548AIMSE#TRPBF | ||
|
Jun 5, 2024 - 24_0003 Epoxy Change from Henkel 8290 to 8290A for MSOP Package (2) |
||
| LTC3548AIMSE#PBF | ||
| LTC3548AIMSE#TRPBF | ||
|
Jul 29, 2026 - 26_0046 Discontinuation of Parts Manufactured in TSMC Fab 2 and 5 in Hsinchu, Taiwan. |
||
| LTC3548AEDD#PBF | ||
| LTC3548AEDD#TRPBF | ||
| LTC3548AEMSE#PBF | ||
| LTC3548AEMSE#TRPBF | ||
| LTC3548AIDD#PBF | ||
| LTC3548AIDD#TRPBF | ||
| LTC3548AIMSE#PBF | ||
| LTC3548AIMSE#TRPBF | ||
This is the most up-to-date revision of the Data Sheet.
Software Resources
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Request a Driver/SoftwareHardware Ecosystem
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| Switching Regulators & Controllers 1 | ||
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Tools & Simulations
LTspice
Models for the following parts are available in LTspice:
- LTC3548
- LTC3548-1
- LTC3548-2
- LTC3548A
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.