LTC3603
PRODUCTION2.5A, 15V Monolithic Synchronous Step-Down Regulator
- Part Models
- 8
- 1ku List Price
- Starting From $4.92
Overview
- Wide Input Voltage Range: 4.5V to 15V
- 2.5A Output Current
- Low RDS(ON) Internal Switches: 45mΩ and 85mΩ
- Programmable Frequency: 300kHz to 3MHz
- Low Quiescent Current: 75μA
- 0.6V ±1% Reference Allows Precise,
- Low Output Voltage
- 99% Maximum Duty Cycle
- Adjustable Burst Mode® Clamp
- Synchronizable to External Clock
- Power Good Output Voltage Monitor
- Overtemperature Protection
- Overvoltage Protection
- Available in 16-Lead Thermally Enhanced MSOP and 4mm × 4mm QFN Packages
The LTC3603 is a high efficiency, monolithic synchronous step-down DC/DC converter utilizing a constant-frequency, current mode architecture. It operates from an input voltage range of 4.5V to 15V and provides an adjustable regulated output voltage from 0.6V to 14.5V while delivering up to 2.5A of output current. The internal synchronous power switch with 45mΩ on-resistance increases efficiency and eliminates the need for an external Schottky diode. The switching frequency can either be set by an external resistor or synchronized to an external clock. OPTI-LOOP® compensation allows the transient response to be optimized over a wide range of loads and output capacitors.
The LTC3603 can be configured for either Burst Mode operation or forced continuous operation. Forced continuous operation reduces noise and RF interference, while Burst Mode operation provides the highest efficiency at light loads. In Burst Mode operation, external control of the burst clamp level allows the output voltage ripple to be adjusted according to the requirements of the application.
Applications
- Point-of-Load Supplies
- Portable Instruments
- Communications Infrastructure
Documentation
Data Sheet 1
User Guide 2
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 |
|---|---|---|---|
| LTC3603EMSE#PBF | 16-Lead MSOP w/ EP | ||
| LTC3603EMSE#TRPBF | 16-Lead MSOP w/ EP | ||
| LTC3603EUF#PBF | 20-Lead QFN (4mm x 4mm x 0.75mm w/ EP) | ||
| LTC3603EUF#TRPBF | 20-Lead QFN (4mm x 4mm x 0.75mm w/ EP) | ||
| LTC3603IMSE#PBF | 16-Lead MSOP w/ EP | ||
| LTC3603IMSE#TRPBF | 16-Lead MSOP w/ EP | ||
| LTC3603IUF#PBF | 20-Lead QFN (4mm x 4mm x 0.75mm w/ EP) | ||
| LTC3603IUF#TRPBF | 20-Lead QFN (4mm x 4mm x 0.75mm w/ EP) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Feb 14, 2025 - 25_0017 Bond Wire Change from Gold to Copper |
||
| LTC3603EMSE#PBF | PRODUCTION | |
| LTC3603EMSE#TRPBF | PRODUCTION | |
| LTC3603EUF#PBF | PRODUCTION | |
| LTC3603EUF#TRPBF | PRODUCTION | |
|
Jun 5, 2024 - 24_0003 Epoxy Change from Henkel 8290 to 8290A for MSOP Package (2) |
||
| LTC3603EMSE#PBF | PRODUCTION | |
| LTC3603EMSE#TRPBF | PRODUCTION | |
| LTC3603IMSE#PBF | PRODUCTION | |
| LTC3603IMSE#TRPBF | PRODUCTION | |
|
Feb 4, 2020 - 20_0132 Laser Top Mark for 16-Lead MSOP Packages Assembled in ADPG and UTAC |
||
| LTC3603EMSE#PBF | PRODUCTION | |
| LTC3603EMSE#TRPBF | PRODUCTION | |
| LTC3603IMSE#PBF | PRODUCTION | |
| LTC3603IMSE#TRPBF | PRODUCTION | |
|
Feb 20, 2022 - 21_0269 Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products |
||
| LTC3603EUF#PBF | PRODUCTION | |
| LTC3603EUF#TRPBF | PRODUCTION | |
| LTC3603IUF#PBF | PRODUCTION | |
| LTC3603IUF#TRPBF | PRODUCTION | |
|
Apr 14, 2025 - 25_0017 Bond Wire Change from Gold to Copper |
||
| LTC3603IMSE#PBF | PRODUCTION | |
| LTC3603IMSE#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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| Circuit Monitors 1 | ||
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| Comparators 1 | ||
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| Oscillators 1 | ||
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| Power System Management (PSM) & Sequencers 1 | ||
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| Parts | Product Life Cycle | Description |
|---|---|---|
| LTC3604 | PRODUCTION | 2.5A, 15V Monolithic Synchronous Step-Down Regulator |
Tools & Simulations
LTspice 1
Models for the following parts are available in LTspice:
- LTC3603
LTpowerCAD 2
- LTC3603 Project - 2.5A, 15V Monolithic Buck Regulator (4.5-15V to 3.3V @ 2.5A)
- LTC3603 Project - 2.5A, 15V Monolithic Buck Regulator (4.5-15V to 3.3V @ 2.5A)
Design tools for the following parts are available in LTpowerCAD:
- LTC3603
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.
LTpowerCAD® is a power supply design program which selects power stage components, provides detailed power efficiency, shows quick loop Bode plot stability and load transient analysis, and can export to LTspice for simulation.
Evaluation Kits
Reference Designs
