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Analog Devices Inc. LTC7138MPMSE#TRPBF
- Part No.:
- LTC7138MPMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width), 12 Leads, Exposed Pad
- Datasheet:
-
LTC7138MPMSE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 400MA 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,078
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Product details
Overview
LTC7138MPMSE#TRPBF from Analog Devices is a high-efficiency, 140V-input, 400mA step-down DC/DC regulator with integrated P-channel MOSFET, 12µA quiescent current in Burst Mode®, programmable peak current limit (140–610mA), and 0.8V ±1% feedback reference. It operates across –55°C to 150°C and supports adjustable or fixed 1.8V/3.3V/5V outputs for harsh-environment power conversion.
For engineers reviewing the LTC7138MPMSE#TRPBF datasheet, LTC7138MPMSE#TRPBF pinout, LTC7138MPMSE#TRPBF application, or LTC7138MPMSE#TRPBF equivalent, key selection considerations include input overvoltage lockout configuration, ISET resistor programming for load-current optimization, RUN pin undervoltage threshold setting, and parallel operation via FBO for >400mA output.
Technical Context
The LTC7138MPMSE#TRPBF employs Burst Mode® control with hysteretic feedback, enabling ultra-low 12µA no-load supply current while maintaining regulation. Its internal P-channel MOSFET supports 100% duty cycle dropout operation and delivers up to 400mA average output current with peak current programmable via ISET pin (140–610mA typical).
It integrates precision RUN and OVLO comparators (1.21V rising threshold, 110mV hysteresis), soft-start control (1ms internal or capacitor-programmable), and feedback comparator output (FBO) for master-slave parallel operation. The device uses valley-current sensing and 0.8V reference tracking to ensure stable light-load regulation without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 140V - enables direct regulation from industrial 48V, 96V, or 125V DC bus, PoE++ injectors, and automotive 12V/24V/48V systems with transient margin. |
| Max Output Current | 400mA average - determined by 75% of programmed peak current (e.g., 540mA peak → 405mA avg); scalable via FBO-parallel connection. |
| Quiescent Current | 12µA in Burst Mode® - sustains regulated output at microamp-level loads (e.g., sensor bias, keep-alive circuits) without battery drain. |
| Feedback Reference | 0.800V ±1% - sets precise output voltage via external divider; fixed outputs (1.8V/3.3V/5V) selected by VPRG1/VPRG2 pin strapping. |
| Peak Current Limit | Programmable 140–610mA via ISET resistor - allows optimization of inductor size, output ripple, and efficiency across 100–400mA load range. |
| Operating Temp Range | –55°C to +150°C - qualified per AEC-Q100 Grade MP; suitable for under-hood automotive, downhole tools, and military avionics. |
| Package Thermal Resistance | θJA = 40°C/W, θJC = 10°C/W - exposed pad (Pin 17) must be soldered to PCB ground plane for rated thermal performance. |
Pinout & Package
Package: 16-lead plastic MSOP (MSE16 variant with four missing pins), thermally enhanced high-voltage package; exposed pad (Pin 17) is GND and must be soldered to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (1) | Switch node | Drain of internal P-channel MOSFET; connects to inductor and catch diode cathode; carries full switching current and voltage stress up to 140V. |
| VIN (3) | Main input supply | Accepts 4V–140V DC; requires local 1µF/250V ceramic bypass capacitor to GND for EMI suppression and transient immunity. |
| FBO (5) | Feedback comparator output | Open-drain output (70Ω pull-down, 20µA pull-up) used to synchronize multiple LTC7138s in parallel for higher current. |
| VPRG1 / VPRG2 (6,7) | Output voltage selection | Strap pins to GND or SS to select fixed 1.8V/3.3V/5V or enable adjustable mode; eliminates external feedback resistors for standard outputs. |
| GND (8,17) | Ground reference | Pins 8 and 17 (exposed pad) are common GND; exposed pad is mandatory for thermal and electrical performance. |
| VFB (9) | Feedback input | Compares divided output voltage against 0.8V reference; directly tied to output for fixed-VOUT modes; connects to divider for adjustable mode. |
| SS (10) | Soft-start control | Capacitor-to-GND sets ramp time (1ms per 6.25nF); internal 1ms default ensures controlled start-up and prevents input droop. |
| ISET (11) | Peak current programming | 5µA current source to GND sets peak current threshold (140–610mA); resistor value determines max output current and ripple trade-off. |
| OVLO (12) | Overvoltage lockout input | Resistor divider from VIN sets disable threshold (1.21V rising); triggers soft-start reset on transients for graceful recovery. |
| RUN (14) | Enable/undervoltage control | 1.21V rising threshold enables operation; 110mV hysteresis prevents chatter; can configure UVLO or remote ON/OFF control. |
| ANODE (16) | Catch diode anode sense | Connects to cathode of external Schottky diode; internal sense resistor enables valley-current detection and short-circuit protection. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Reduces no-load IQ to 12µA while maintaining regulation-critical for battery-backed or energy-harvesting systems. |
| Programmable peak current limit | Adjusts max output current from 100mA to 400mA via single ISET resistor-optimizes inductor size, efficiency, and ripple without redesign. |
| Fixed-output voltage strapping | VPRG1/VPRG2 pins select 1.8V/3.3V/5V without external resistors-reduces BOM count and improves noise immunity vs. feedback divider. |
| Parallel operation support | FBO pin enables master-slave synchronization of multiple LTC7138s-scales output current linearly (e.g., two devices → 800mA) with shared soft-start. |
| AEC-Q100 Grade MP qualification | Rated for –55°C to +150°C junction temperature-validated for automotive under-hood, industrial motor drives, and aerospace power supplies. |
Applications
| Industrial Control Supplies | Avionics Power Conversion |
|---|---|
Use Scenario: Regulating 125V DC aircraft bus to 5V for flight control sensors and data acquisition units. IC Role / Device Role / Timing Role: Primary step-down regulator delivering 400mA at 5V with 140V input tolerance and thermal robustness. Use Value: Eliminates need for pre-regulator stages; 12µA quiescent current extends backup battery life during standby. |
Use Scenario: Converting 28V aircraft bus to 3.3V for ARINC 429 interface logic and FPGA configuration. IC Role / Device Role / Timing Role: High-reliability point-of-load regulator with AEC-Q100 MP qualification and 150°C operation. Use Value: Withstands wide ambient swings and vibration; programmable OVLO prevents false shutdown during generator transients. |
| Automotive Battery Management | Distributed Power Systems |
Use Scenario: Supplying 1.8V to automotive camera ISP processors from 12V/48V dual-battery architecture. IC Role / Device Role / Timing Role: Adjustable-output buck converter with RUN pin controlled by MCU GPIO for system-level power sequencing. Use Value: 100% duty cycle dropout supports cold-crank operation; ISET programming tailors current capability to camera module requirements. |
Use Scenario: Providing isolated 5V rails to remote I/O modules in factory automation networks powered from 48V DC backbone. IC Role / Device Role / Timing Role: High-input-voltage regulator with parallel FBO capability to deliver >400mA across long cable runs. Use Value: Enables modular power design with identical LTC7138MPMSE#TRPBF units; shared soft-start avoids inrush current stacking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-input-voltage step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3649EMSE#TRPBF | Higher 150V max input, 2A output, but 250µA IQ and no Burst Mode®; requires external MOSFET. | Used where >400mA is required and higher quiescent current is acceptable; not suitable for ultra-low-power keep-alive functions. | Select when output current >400mA is mandatory and thermal headroom permits higher IQ; avoid for battery-critical systems. |
| MAX5033BASA+T | 100V max input, 250mA output, 100µA IQ, fixed 5V/3.3V only; no ISET or FBO; SO-8 package. | Targeted at cost-sensitive, lower-current industrial supplies; lacks programmability and parallel capability. | Choose for simple, low-cost 5V/3.3V conversion below 250mA; unsuitable for 140V inputs or adjustable outputs. |
Compared with LTC3649EMSE#TRPBF and MAX5033BASA+T, the LTC7138MPMSE#TRPBF uniquely balances ultra-low 12µA quiescent current, 140V input, 400mA output, and full programmability-including peak current, output voltage, and parallel operation-in a single compact MSE package.
Availability
LTC7138MPMSE#TRPBF is available at Aetrix Electronics and suitable for industrial control supplies, avionics power conversion, automotive battery management, and distributed power systems requiring stable component supply across extended temperature ranges.
Supply support for LTC7138MPMSE#TRPBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC7138MPMSE#TRPBF belongs to Analog Devices' Power by Linear™ high-voltage DC/DC regulator family, designed specifically for reliable, efficient power conversion in harsh environments with wide input ranges and extreme temperature operation.
FAQ
What is the maximum input voltage rating for the LTC7138MPMSE#TRPBF?
The LTC7138MPMSE#TRPBF has an absolute maximum input voltage rating of 140V and a specified operating input range of 4V to 140V. This allows direct regulation from high-voltage sources such as industrial 48V/96V buses, PoE++ injectors, and automotive 48V systems without external pre-regulation. Exceeding 140V may cause permanent damage.
How does the ISET pin on the LTC7138MPMSE#TRPBF affect output current capability?
The ISET pin on the LTC7138MPMSE#TRPBF programs the peak inductor current threshold from 140mA to 610mA using a resistor to GND. Since maximum average output current is ~75% of peak current, this directly sets the usable load range: open ISET yields ~400mA, shorting to GND reduces it to ~100mA. This enables optimization of efficiency, ripple, and component size per application.
Can the LTC7138MPMSE#TRPBF operate in 100% duty cycle dropout mode?
Yes, the LTC7138MPMSE#TRPBF supports 100% duty cycle operation due to its internal P-channel MOSFET high-side switch. When input voltage approaches the output voltage, the controller maintains regulation by holding the switch continuously on-enabling stable output during cold-crank events in automotive 12V systems or brownout conditions in industrial 24V/48V supplies.
What is the purpose of the FBO pin on the LTC7138MPMSE#TRPBF?
The FBO (Feedback Comparator Output) pin on the LTC7138MPMSE#TRPBF is an open-drain output used to connect multiple LTC7138MPMSE#TRPBF devices in master-slave parallel configuration. By tying the FBO of a master unit to the VFB pins of slave units, all regulators synchronize switching and share load current proportionally-scaling total output to 400mA × N devices with matched soft-start and regulation.
Is the LTC7138MPMSE#TRPBF qualified for automotive applications?
Yes, the LTC7138MPMSE#TRPBF is AEC-Q100 qualified for automotive applications under Grade MP, with guaranteed operation from –55°C to +150°C junction temperature. It includes precise RUN and OVLO thresholds, thermal shutdown at ~180°C, and robust input protection-making it suitable for under-hood engine control, ADAS camera power, and battery management systems.
LTC7138MPMSE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width), 12 Leads, Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable (Programmable)
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 140V
- Voltage - Output (Min/Fixed):
- 0.8V (1.8V, 3.3V, 5V)
- Voltage - Output (Max):
- 140V
- Current - Output:
- 400mA
- Frequency - Switching:
- -
- Synchronous Rectifier:
- No
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LTC7138MPMSE#TRPBF FAQ
1.How can I place an order for LTC7138MPMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7138MPMSE#TRPBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LTC7138MPMSE#TRPBF reliable?
The price and inventory of LTC7138MPMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7138MPMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC7138MPMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7138MPMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7138MPMSE#TRPBF?
LTC7138MPMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7138MPMSE#TRPBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LTC7138MPMSE#TRPBF?
For technical support, including LTC7138MPMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7138MPMSE#TRPBF requirements.
6.How does Aetrix verify that LTC7138MPMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC7138MPMSE#TRPBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LTC7138MPMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC7138MPMSE#TRPBF?
All LTC7138MPMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7138MPMSE#TRPBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LTC7138MPMSE#TRPBF part is unused and in its original packaging.
Return procedure for LTC7138MPMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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