LTC3546
PRODUCTIONDual Synchronous, 3A/1A or 2A/2A Configurable Step-Down DC/DC Regulator
- Part Models
- 8
- 1ku List Price
- Starting From $5.67
Overview
- VIN Range: 2.25V to 5.5V
- VOUT Range: 0.6V to 5V
- Programmable Frequency Operation; 2.25MHz, or Adjustable Between 0.75MHz to 4MHz
- Low RDS(ON) Internal Switches
- High Efficiency: Up to 96%
- No Schottky Diodes Required
- Short-Circuit Protected
- Current Mode Operation for Excellent Line and Load Transient Response
- Low Ripple Burst Mode Operation (30mVP-P), IQ = 160μA
- Ultralow Shutdown Current: IQ < 1μA
- Low Dropout Operation: 100% Duty Cycle
- Power Good Output For Each Channel
- Externally or Internally Programmable Burst Level
- External or Internal Soft-Start or Supply Tracking
- Available in Thermally Enhanced 28-Lead (4mm × 5mm) QFN and TSSOP Packages
The LTC3546 is a dual, constant-frequency, synchronous step down DC/DC converter for medium power applications. The design consists of 2A and 1A primary output switches. In addition to the 2A/1A capability, a 1A dependant output switch can be externally connected to either of the primary outputs to produce 3A/1A dual regulator or 2A/2A dual regulator configurations.
Supply operation is from 2.25V to 5.5V. The switching frequency can be set to 2.25MHz, adjustable from 0.75MHz to 4MHz, or synchronized to an external clock. Each output is adjustable from 0.6V to 5V and has output tracking on power-up. Internal synchronous low RDS(ON) power switches provide high efficiency without external Schottky diodes.
User-selectable modes (Burst Mode® operation, pulse skipping and forced continuous) allow a trade-off between ripple noise and power efficiency. Burst Mode operation provides high efficiency at light loads. Pulse-skipping mode provides low ripple noise at light loads.
The device is capable of low dropout configurations and both channels can operate at 100% duty cycle. In shutdown, the device draws <1μA.
Applications
- Netbooks/Ultra-Mobile PCs
- PC Cards
- Wireless and DSL Modems
- Point of Load DC/DC Conversion
Documentation
Data Sheet 1
User Guide 2
Design Note 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 |
|---|---|---|---|
| LTC3546EFE#PBF | 28-Lead TSSOP w/ EP | ||
| LTC3546EFE#TRPBF | 28-Lead TSSOP w/ EP | ||
| LTC3546EUFD#PBF | 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | ||
| LTC3546EUFD#TRPBF | 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | ||
| LTC3546IFE#PBF | 28-Lead TSSOP w/ EP | ||
| LTC3546IFE#TRPBF | 28-Lead TSSOP w/ EP | ||
| LTC3546IUFD#PBF | 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | ||
| LTC3546IUFD#TRPBF | 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
May 18, 2026 - 26_0072 Epoxy Change for Select TSSOP Products |
||
| LTC3546EFE#PBF | PRODUCTION | |
| LTC3546EFE#TRPBF | PRODUCTION | |
| LTC3546IFE#PBF | PRODUCTION | |
| LTC3546IFE#TRPBF | PRODUCTION | |
|
Apr 6, 2022 - 22_0068 Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL |
||
| LTC3546EFE#PBF | PRODUCTION | |
| LTC3546EFE#TRPBF | PRODUCTION | |
| LTC3546IFE#PBF | PRODUCTION | |
| LTC3546IFE#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 1
Models for the following parts are available in LTspice:
- LTC3546
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.
