LTC7138: High Efficiency, 140V 400mA Step-Down Regulator Data Sheet1/9/2015472K
Features and Benefits
- Wide Operating Input Voltage Range: 4V to 140V
- Internal Low Resistance Power MOSFET
- No Compensation Required
- Adjustable 100mA to 400mA 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 LTC7138 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 LTC7138 can supply up to 400mA 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 LTC7138’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 LTC7138 is a robust regulator suited for regulating from a wide variety of power sources. Additionally, the LTC7138 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 LTC7138s to be connected in parallel for higher current applications.
The LTC7138 is available in a thermally enhanced high voltage-capable 16-lead MSE package with four missing pins.
- Industrial Control Supplies
- Medical Devices
- Distributed Power Systems
- Portable Instruments
- Battery-Operated Devices
Product Lifecycle Recommended for New Designs
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
Evaluation Kits (1)
Demonstration circuit 2172A is a high input voltage, 400mA step-down regulator featuring the LTC7138. The output of the regulator can be programmed for either 5V, 3.3V or 1.8V with on-board jumpers or is adjustable from 800mV to VIN using an optional feedback divider. The input voltage range is from 4V to 140V. The LTC7138’s Burst Mode® operation, low quiescent current and internal top FET switch provide high efficiency over a wide range of loads.
Documentation & Resources
R562 Reliability Data3/22/2018159K
DC2172A - Demo Manual2/13/2015434K
80V to 150V Non-Isolated DC/DC2/6/2018661K
High Voltage Non-Isolated Devices1/5/2018661K
Tools & Simulations
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Step 1: Download and install LTspice on your computer.
Step 2: Click on the link in the section below to download a demonstration circuit.
Step 3: If LTspice does not automatically open after clicking the link below, 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.
Models for the following parts are available in LTspice:
LTC7138 Companion Parts
Recommended Related Parts
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 Number||Material Declaration||Reliability Data||Pin/Package Drawing||CAD Symbols, Footprints & 3D Models|
|LTC7138EMSE#PBF||Material Declaration||Reliability Data||16(12)-Lead MSOP w/ EP|
|LTC7138EMSE#TRPBF||Material Declaration||Reliability Data||16(12)-Lead MSOP w/ EP|
|LTC7138HMSE#PBF||Material Declaration||Reliability Data||16(12)-Lead MSOP w/ EP|
|LTC7138HMSE#TRPBF||Material Declaration||Reliability Data||16(12)-Lead MSOP w/ EP|
|LTC7138IMSE#PBF||Material Declaration||Reliability Data||16(12)-Lead MSOP w/ EP|
|LTC7138IMSE#TRPBF||Material Declaration||Reliability Data||16(12)-Lead MSOP w/ EP|
|LTC7138MPMSE#PBF||Material Declaration||Reliability Data||16(12)-Lead MSOP w/ EP|
|LTC7138MPMSE#TRPBF||Material Declaration||Reliability Data||16(12)-Lead MSOP w/ EP|
|Wafer Fabrication Data||R562 Reliability Data|
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.