LTC3638
RECOMMENDED FOR NEW DESIGNSHigh Efficiency, 140V 250mA Step-Down Regulator
- Part Models
- 8
- 1ku List Price
- Starting From $5.54
Overview
- Wide Operating Input Voltage Range: 4V to 140V
- Internal Low Resistance Power MOSFET
- No Compensation Required
- Adjustable 20mA to 250mA Maximum Output Current
- Low Dropout Operation: 100% Duty Cycle
- Low Quiescent Current: 12μA
- Wide Output Range: 0.8V to VIN
- 0.8V ±1% Feedback Voltage Reference
- Precise RUN Pin Threshold
- Internal or External Soft-Start
- Programmable 1.8V, 3.3V, 5V or Adjustable Output
- Few External Components Required
- Programmable Input Overvoltage Lockout
- Thermally Enhanced High Voltage MSOP Package
The LTC3638 is a high efficiency step-down DC/DC regulator with internal power switch that draws only 12μA typical DC supply current while maintaining a regulated output voltage at no load.
The LTC3638 can supply up to 250mA load current and features a programmable peak current limit that provides a simple method for optimizing efficiency and for reducing output ripple and component size. The LTC3638’s combination of Burst Mode® operation, integrated power switch, low quiescent current, and programmable peak current limit provides high efficiency over a broad range of load currents.
With its wide input range of 4V to 140V and programmable overvoltage lockout, the LTC3638 is a robust regulator suited for regulating from a wide variety of power sources. Additionally, the LTC3638 includes a precise run threshold and soft-start feature to guarantee that the power system start-up is well-controlled in any environment. A feedback comparator output enables multiple LTC3638s to be connected in parallel for higher current applications.
The LTC3638 is available in a thermally enhanced high voltage-capable 16-lead MSE package with four missing pins.
Applications
- Industrial Control Supplies
- Medical Devices
- Distributed Power Systems
- Portable Instruments
- Battery-Operated Devices
- Avionics
- Automotive
Documentation
Data Sheet 1
User Guide 1
Product Selector Card 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 |
|---|---|---|---|
| LTC3638EMSE#PBF | 16(12)-Lead MSOP w/ EP | ||
| LTC3638EMSE#TRPBF | 16(12)-Lead MSOP w/ EP | ||
| LTC3638HMSE#PBF | 16(12)-Lead MSOP w/ EP | ||
| LTC3638HMSE#TRPBF | 16(12)-Lead MSOP w/ EP | ||
| LTC3638IMSE#PBF | 16(12)-Lead MSOP w/ EP | ||
| LTC3638IMSE#TRPBF | 16(12)-Lead MSOP w/ EP | ||
| LTC3638MPMSE#PBF | 16(12)-Lead MSOP w/ EP | ||
| LTC3638MPMSE#TRPBF | 16(12)-Lead MSOP w/ EP |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Jun 5, 2024 - 24_0003 Epoxy Change from Henkel 8290 to 8290A for MSOP Package (2) |
||
| LTC3638EMSE#PBF | PRODUCTION | |
| LTC3638EMSE#TRPBF | PRODUCTION | |
| LTC3638HMSE#PBF | PRODUCTION | |
| LTC3638HMSE#TRPBF | PRODUCTION | |
| LTC3638IMSE#PBF | PRODUCTION | |
| LTC3638IMSE#TRPBF | PRODUCTION | |
| LTC3638MPMSE#PBF | PRODUCTION | |
| LTC3638MPMSE#TRPBF | PRODUCTION | |
|
Feb 4, 2020 - 20_0129 Laser Mark Conversion for 12-Lead MSOP Packages Assembled in ADPG and UTAC |
||
| LTC3638EMSE#PBF | PRODUCTION | |
| LTC3638EMSE#TRPBF | PRODUCTION | |
| LTC3638HMSE#PBF | PRODUCTION | |
| LTC3638HMSE#TRPBF | PRODUCTION | |
| LTC3638IMSE#PBF | PRODUCTION | |
| LTC3638IMSE#TRPBF | PRODUCTION | |
| LTC3638MPMSE#PBF | PRODUCTION | |
| LTC3638MPMSE#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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Tools & Simulations
LTspice 1
Models for the following parts are available in LTspice:
- LTC3638
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.
Evaluation Kits
LTC3638 Demo Board | 4V ≤ VIN ≤ 140V, VOUT = 1.8V/3.3V/5V/Adjustable @ 250mA