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Analog Devices Inc. LTC7138MPMSE#PBF
- Part No.:
- LTC7138MPMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width), 12 Leads, Exposed Pad
- Datasheet:
-
LTC7138MPMSE#PBF.pdf
- Description:
- IC REG BUCK ADJ 400MA 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,170
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Product details
Overview
LTC7138MPMSE#PBF from Analog Devices is a high-efficiency, wide-input 140V monolithic step-down DC/DC regulator with integrated P-channel MOSFET, delivering up to 400mA output current, featuring 12µA no-load quiescent current, programmable peak current limit (140–610mA), and 0.8V ±1% feedback reference - deployed in automotive power supplies requiring robust input transient handling and extended temperature operation.
For engineers reviewing the LTC7138MPMSE#PBF datasheet, LTC7138MPMSE#PBF pinout, LTC7138MPMSE#PBF application, or LTC7138MPMSE#PBF equivalent, key selection considerations include its –55°C to 150°C operating junction range, 4V–140V input capability, programmable OVLO/RUN thresholds, Burst Mode® efficiency optimization, and parallelability via FBO for higher-current systems.
Technical Context
The LTC7138MPMSE#PBF implements a hysteretic Burst Mode® control architecture with internal P-channel MOSFET switch, where regulation is maintained by alternating burst cycles (with inductor current ramping between programmable peak and valley thresholds) and sleep cycles (drawing only 12µA). Its feedback comparator compares VFB against a precision 0.8V reference, triggering bursts when VFB falls 5mV below threshold.
Peak current is set via ISET pin using a resistor-to-GND (140–610mA range), directly determining maximum average output current (100–405mA); valley current is fixed at ~60% of peak. The RUN and OVLO pins provide independent, precise undervoltage and overvoltage lockout with 110mV hysteresis, enabling configurable input voltage windows without external comparators.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 140V - supports direct regulation from unregulated industrial, avionics, or battery-string inputs without pre-regulation. |
| Max Output Current | 400mA - achievable with ISET floating (610mA peak), limited by thermal design and inductor saturation in MSE package. |
| Quiescent Current | 12µA typical in Burst Mode® sleep - enables multi-year battery life in always-on remote sensors or telematics. |
| Feedback Reference | 0.8V ±1% - enables accurate adjustable outputs down to 0.8V or fixed 1.8V/3.3V/5V via VPRG pins with no external resistors. |
| Operating Temp Range | –55°C to 150°C junction - qualified per AEC-Q100 for under-hood automotive, downhole, or military-grade embedded systems. |
| Switch On-Resistance | 1.8Ω typical - low RDS(on) minimizes conduction loss at high input voltages and light loads. |
| Soft-Start Time | 1ms internal default - prevents input droop during cold-start; externally adjustable via SS capacitor for controlled ramp-up. |
Pinout & Package
The LTC7138MPMSE#PBF is housed in a thermally enhanced 16-lead plastic MSOP (MSE) package with four missing pins (pins 2, 4, 13, 15), featuring an exposed GND pad (pin 17) that must be soldered to PCB for thermal and electrical performance. Package dimensions comply with standard MSOP footprint but require attention to pad layout per Analog Devices' MSE16(12) variant specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (1) | Switch Node | Drain of internal P-MOSFET; connects to inductor and catch diode cathode - requires low-inductance layout to minimize switching noise. |
| VIN (3) | Main Input Supply | Accepts 4V–140V; bypassed with ≥1µF/250V ceramic capacitor - primary path for high-voltage transients and ripple current. |
| FBO (5) | Feedback Comparator Output | Open-drain output (20µA pull-up, 70Ω pull-down) for master-slave paralleling - enables current sharing across multiple LTC7138MPMSE#PBF units. |
| VPRG1/VPRG2 (6,7) | Output Voltage Selection | Configures fixed 1.8V/3.3V/5V or adjustable mode via grounding or connection to SS - eliminates external feedback resistors in standard applications. |
| GND (8,17) | Ground Reference | Pins 8 and exposed pad 17 are internally connected - pad must be soldered to large PCB ground plane for θJA = 40°C/W thermal performance. |
| VFB (9) | Feedback Input | Compares divided output voltage to 0.8V reference - shorted to VOUT for fixed outputs; connected to divider for adjustable configurations. |
| SS (10) | Soft-Start Control | Sourced with 5µA (normal) or 50µA (startup) current - sets output ramp time (1ms per 6.25nF) to prevent input sag or inrush stress. |
| ISET (11) | Peak Current Programming | Resistor-to-GND sets peak inductor current (140–610mA); valley current tracks at ~60% - enables optimization of efficiency vs. ripple trade-off. |
| OVLO (12) | Overvoltage Lockout Input | Disables switching when >1.21V (hysteresis 110mV); resets soft-start on overvoltage event - protects downstream circuitry from input surges. |
| RUN (14) | Enable/Undervoltage Control | Enables operation above 1.21V (hysteresis 110mV); shuts down to 1.4µA when <0.7V - provides precise input window control without external circuitry. |
| ANODE (16) | Catch Diode Anode Sense | Connects to cathode of external Schottky diode; internal sense resistor enables valley current detection - critical for discontinuous conduction mode timing. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® Operation | Maintains 12µA no-load IQ while delivering full 400mA load - achieves >85% efficiency at 1mA and >90% at 100mA across 4V–140V input range. |
| Programmable Peak Current Limit | Adjustable 140–610mA via single ISET resistor - allows component size reduction (smaller inductor/capacitor) and ripple optimization for specific load profiles. |
| Wide Input Voltage Range | 4V–140V operation with integrated 140V-rated MOSFET - eliminates need for external HV front-end stages in railway, industrial, or battery-stack applications. |
| Fixed Output Voltage Options | 1.8V/3.3V/5V selectable via VPRG pins - removes external feedback resistors and associated noise sensitivity, simplifying BOM and layout. |
| AEC-Q100 Qualified | Rated for –55°C to 150°C junction temperature - validated for automotive engine control, ADAS power rails, and other harsh-environment deployments. |
| Parallel Operation Support | FBO pin enables master-slave configuration - scales output current linearly (e.g., two LTC7138MPMSE#PBF = 800mA) with automatic current balancing. |
Applications
| Automotive Engine Control Unit (ECU) Power | Industrial Sensor Transmitter Supply |
|---|---|
Use Scenario: Regulating 12V–48V vehicle battery or 72V hybrid bus to stable 3.3V for microcontroller, CAN transceiver, and analog front-end in under-hood ECU modules. IC Role / Device Role / Timing Role: Primary step-down regulator providing isolated, low-noise, high-reliability power with built-in OVLO/RUN monitoring for ignition transients and cold-crank conditions. Use Value: Eliminates need for external TVS and pre-regulator; 12µA IQ extends battery backup runtime; AEC-Q100 qualification ensures functional safety compliance. |
Use Scenario: Powering 4–20mA loop-powered smart sensors in oil & gas refineries, where input may vary from 12V to 40V and ambient temperatures reach 125°C. IC Role / Device Role / Timing Role: High-voltage buck converter supplying 5V to sensor ASIC and signal conditioning circuitry, with programmable OVLO to reject line surges. Use Value: Single-chip solution withstands 140V transients; –55°C to 150°C rating covers extreme ambient ranges; low IQ reduces self-heating in sealed enclosures. |
| Avionics Remote Data Acquisition | Medical Portable Diagnostic Device |
Use Scenario: Converting 28V aircraft bus or 115VAC-derived 100V DC to 1.8V/3.3V for FPGA, ADC, and RF front-end in flight data recorders or health monitoring units. IC Role / Device Role / Timing Role: Robust primary regulator with 100% duty-cycle dropout capability and precise RUN threshold - ensures uninterrupted operation during brownouts. Use Value: 140V absolute max rating handles lightning-induced surges; parallel FBO support enables redundant power paths per DO-254 requirements. |
Use Scenario: Battery-powered ultrasound or point-of-care monitor requiring ultra-low standby power and reliable startup from partially discharged Li-ion (3.0V–4.2V). IC Role / Device Role / Timing Role: Efficient buck regulator delivering 5V to display, processor, and analog subsystems, with soft-start preventing battery voltage sag during wake-up. Use Value: 12µA sleep current extends clinical use time; 0.8V reference enables accurate low-voltage rail generation; medical-grade reliability supported by Analog Devices' quality system. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164QPWPRQ1 | 4.5V–100V input, 300mA, 100ns min on-time, requires external compensation - lacks programmable peak current and integrated OVLO/RUN comparators. | Targeted at cost-sensitive automotive body electronics; not rated for >125°C junction or 140V transients. | Choose LM5164QPWPRQ1 only if input stays ≤100V and design can accommodate external loop compensation and discrete protection circuitry. |
| MAX5033BASA+ | 4.5V–76V input, 250mA, fixed 5V/3.3V/1.8V outputs, no ISET programming - uses external MOSFET, higher BOM count, no parallel support. | Designed for space-constrained consumer portables; lacks AEC-Q100 qualification and extended temperature grade. | Prefer MAX5033BASA+ only for non-automotive, ≤76V, ≤250mA applications where board area is more critical than thermal robustness or scalability. |
Compared with LM5164QPWPRQ1 and MAX5033BASA+, the LTC7138MPMSE#PBF delivers superior high-voltage resilience (140V), wider temperature coverage (–55°C to 150°C), integrated protection logic, and scalable current capability - making it the optimal choice for mission-critical automotive, industrial, and avionics power rails.
Availability
LTC7138MPMSE#PBF is available at Aetrix Electronics and suitable for automotive engine control units, industrial sensor transmitters, avionics data acquisition systems, and medical portable diagnostic devices requiring stable component supply across extended temperature and high-voltage operating conditions.
Supply support for LTC7138MPMSE#PBF 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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets with precision power, sensing, and conversion technologies.
The LTC7138MPMSE#PBF belongs to Analog Devices' Power by Linear™ family of high-voltage monolithic DC/DC regulators, engineered specifically for ruggedized power conversion in automotive, aerospace, and industrial environments where wide input range, low IQ, and AEC-Q100 compliance are mandatory.
FAQ
What is the maximum input voltage rating for the LTC7138MPMSE#PBF?
The LTC7138MPMSE#PBF has an absolute maximum input voltage rating of 140V, with guaranteed operation from 4V to 140V. This enables direct regulation from high-voltage sources such as 48V/72V battery stacks, industrial 100V DC lines, or rectified AC supplies - eliminating the need for external pre-regulators or clamping circuits in the LTC7138MPMSE#PBF design.
How does the LTC7138MPMSE#PBF achieve ultra-low quiescent current?
The LTC7138MPMSE#PBF achieves 12µA typical quiescent current through Burst Mode® operation: during light loads, it enters sleep cycles where the internal power switch and current comparators are disabled, drawing only bias current. The LTC7138MPMSE#PBF resumes regulated output via short burst cycles only when output voltage droop triggers the feedback comparator - preserving battery life in always-on systems.
Can the LTC7138MPMSE#PBF be used in parallel for higher output current?
Yes, the LTC7138MPMSE#PBF supports parallel operation via its FBO (feedback comparator output) pin. Connecting the FBO of a master LTC7138MPMSE#PBF to the VFB pins of slave units forces current sharing - enabling scalable output (e.g., 800mA with two devices) without external current-sense amplifiers or complex synchronization circuitry in the LTC7138MPMSE#PBF implementation.
What is the purpose of the ANODE pin on the LTC7138MPMSE#PBF?
Pin 16 (ANODE) on the LTC7138MPMSE#PBF serves as the anode connection point for the external catch diode and contains an internal sense resistor tied to GND. It enables valley current detection during discontinuous conduction mode - a critical function for accurate timing of the internal MOSFET turn-on and ensuring stable Burst Mode® regulation in the LTC7138MPMSE#PBF.
Does the LTC7138MPMSE#PBF require external compensation components?
No, the LTC7138MPMSE#PBF uses a hysteretic current-mode control architecture with internal compensation - no external RC networks or type-II/type-III compensators are required. This simplifies design, reduces BOM count, improves noise immunity, and ensures stable operation across all input/output combinations specified for the LTC7138MPMSE#PBF, including 4V–140V input and 0.8V–VIN output ranges.
LTC7138MPMSE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width), 12 Leads, Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC7138MPMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7138MPMSE#PBF 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#PBF reliable?
The price and inventory of LTC7138MPMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7138MPMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC7138MPMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7138MPMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7138MPMSE#PBF?
LTC7138MPMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7138MPMSE#PBF 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#PBF?
For technical support, including LTC7138MPMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7138MPMSE#PBF requirements.
6.How does Aetrix verify that LTC7138MPMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC7138MPMSE#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LTC7138MPMSE#PBF?
All LTC7138MPMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7138MPMSE#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LTC7138MPMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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