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Analog Devices Inc. LTC7138EMSE#TRPBF
- Part No.:
- LTC7138EMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width), 12 Leads, Exposed Pad
- Datasheet:
-
LTC7138EMSE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 400MA 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,998
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Product details
Overview
LTC7138EMSE#TRPBF from Analog Devices is a high-efficiency, 140V input, 400mA synchronous step-down DC/DC regulator with integrated P-channel MOSFET switch, 12µA quiescent current in Burst Mode®, and programmable peak current limit (140–610mA). It operates from 4V to 140V input, delivers adjustable or fixed 1.8V/3.3V/5V output, and supports automotive-grade (-40°C to 125°C) operation in thermally enhanced MSOP-16 package. It is used in industrial control supplies and avionics power rails where wide VIN and ultra-low IQ are critical.
For engineers reviewing the LTC7138EMSE#TRPBF datasheet, LTC7138EMSE#TRPBF pinout, LTC7138EMSE#TRPBF application, or LTC7138EMSE#TRPBF equivalent, key selection considerations include its 140V absolute max input rating, 0.8V ±1% feedback reference, programmable OVLO/RUN thresholds, internal soft-start, and parallelability via FBO pin for higher-current designs.
Technical Context
The LTC7138EMSE#TRPBF employs Burst Mode® control with hysteretic feedback architecture, enabling 12µA no-load IQ while maintaining regulation. Its P-channel internal switch supports 100% duty cycle dropout operation, and valley current tracking (60% of peak) ensures stable light-load behavior without external compensation.
Peak current is set via ISET pin using a resistor-to-GND (140–610mA range), directly determining max average output current (100–405mA). The FBO pin enables master-slave current sharing, and RUN/OVLO pins support precise input voltage window control with 110mV hysteresis each.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 140V - supports direct regulation from unregulated industrial, avionics, or battery-string sources without pre-regulation. |
| Max Output Current | 400mA - confirmed maximum continuous load at full temperature range; scalable to higher current via FBO-parallel configuration. |
| Quiescent Current | 12µA typical in Burst Mode® - enables multi-year battery life in always-on remote sensors or low-power instrumentation. |
| Feedback Reference | 0.800V ±1% - precision reference enabling accurate output setting across temperature; supports 0.8V to VIN output range. |
| Peak Current Limit | Programmable 140–610mA via ISET resistor - allows optimization of inductor size, efficiency, and output ripple for specific load profiles. |
| Package | 16-lead MSE (MSOP-16 variant with 4 missing pins), exposed pad (Pin 17) = GND - provides low θJA = 40°C/W for high-voltage, high-temperature reliability. |
| Operating Temp | –40°C to +125°C (E-grade) - qualified for industrial and automotive under-hood applications per AEC-Q100 requirements. |
Pinout & Package
Package: 16-lead plastic MSOP (MSE16), thermally enhanced high-voltage variant with pins 2, 4, 13, and 15 omitted; exposed thermal pad (Pin 17) must be soldered to PCB ground plane for rated thermal performance (θJC = 10°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (1) | Switch node | Drain of internal P-MOSFET; connects to inductor and cathode of external catch diode - handles full switching current and high dv/dt. |
| VIN (3) | Main input supply | Accepts 4V–140V; requires local ceramic bypass capacitor to GND for stability and EMI suppression. |
| FBO (5) | Feedback comparator output | Open-drain output (70Ω pull-down, 20µA pull-up) to synchronize multiple LTC7138s in parallel for current scaling. |
| VPRG1/VPRG2 (6,7) | Output voltage programming | Configures fixed 1.8V/3.3V/5V or adjustable mode via grounding or connection to SS pin - eliminates external feedback resistors for standard outputs. |
| GND (8,17) | Ground reference & thermal path | Pin 8 and exposed pad (17) are internally connected; pad must be soldered to PCB ground plane for thermal integrity and noise immunity. |
| VFB (9) | Feedback input | Compares divided output voltage against 0.8V reference; shorted to VOUT in fixed-output mode; connected to divider in adjustable mode. |
| SS (10) | Soft-start control | Capacitor-to-GND sets ramp time (1ms per 6.25nF); internal 1ms default if floating - prevents input droop during startup. |
| ISET (11) | Peak current programming | Resistor-to-GND sets peak inductor current (140–610mA); valley current tracks at ~60% - enables ripple/efficiency trade-off. |
| OVLO (12) | Overvoltage lockout input | Resistive divider from VIN sets shutdown threshold (1.21V rising); triggers soft-start reset on transient recovery - protects downstream circuitry. |
| RUN (14) | Enable/disable control | 1.21V rising threshold enables operation; <0.7V forces shutdown (1.4µA IQ); hysteresis ensures clean turn-on/turn-off in noisy environments. |
| ANODE (16) | Catch diode anode sense | Connects to anode of external Schottky diode; internal sense resistor enables accurate valley current detection - critical for light-load stability. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Reduces no-load IQ to 12µA while maintaining regulation - extends battery life and minimizes standby power loss in always-on systems. |
| Programmable peak current limit | 140–610mA via single ISET resistor - enables optimized inductor selection, reduced output ripple, and tailored efficiency vs. load profile. |
| Fixed-output voltage options | 1.8V/3.3V/5V selectable via VPRG1/VPRG2 pin strapping - eliminates external feedback resistors and associated noise sensitivity. |
| Parallel operation support | FBO pin enables master-slave synchronization of multiple LTC7138EMSE#TRPBF units - scales output current beyond 400mA without external controllers. |
| Robust input protection | Independent RUN undervoltage (3.5V typ.) and OVLO overvoltage (programmable) lockouts - ensures safe operation across volatile input sources like battery strings or rectified AC. |
Applications
| Industrial Control Power | Avionics DC-DC Conversion |
|---|---|
|
Use Scenario: Regulating 28V or 115VAC-derived 140V bus down to 5V for PLC I/O modules operating in harsh factory environments. IC Role / Device Role / Timing Role: Primary wide-input buck regulator providing isolated, low-noise 5V rail with high reliability and thermal resilience. Use Value: 140V absolute max rating and –40°C to 125°C operation eliminate need for front-end pre-regulators; 12µA IQ reduces heat buildup in sealed enclosures. |
Use Scenario: Converting aircraft 270VDC or rectified 115VAC to stable 3.3V for flight-critical sensor interfaces requiring AEC-Q100 compliance. IC Role / Device Role / Timing Role: High-voltage, low-quiescent-current step-down regulator meeting DO-160 and AEC-Q100 reliability standards. Use Value: Programmable OVLO prevents transients from damaging downstream avionics; FBO parallel capability supports redundant power paths. |
| Medical Portable Instrumentation | Automotive Battery Monitoring Systems |
|
Use Scenario: Powering handheld ultrasound or ECG devices from multi-cell Li-ion stacks (up to 42V) or 48V PoE++ inputs, requiring long battery runtime. IC Role / Device Role / Timing Role: Efficient primary DC/DC converter delivering regulated 1.8V/3.3V to low-power microcontrollers and analog front-ends. Use Value: 12µA Burst Mode® IQ enables multi-week operation on single charge; adjustable output supports diverse SoC voltage requirements. |
Use Scenario: Supplying 5V to battery management ICs and CAN transceivers in 12V/24V/48V vehicle architectures, including start-stop and 48V mild-hybrid systems. IC Role / Device Role / Timing Role: High-input-voltage buck regulator with precise RUN threshold and AEC-Q100 qualification for automotive subsystems. Use Value: 1.17V RUN threshold ensures reliable startup even during cranking; internal soft-start prevents CAN bus glitches during ignition. |
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 |
|---|---|---|---|
| LTC3639EMSE#TRPBF | Lower max input (60V), lower IQ (4.5µA), same MSOP-16 package, no FBO pin | Suitable only for ≤60V systems; lacks parallel capability and 140V robustness | Select when input never exceeds 60V and ultra-low IQ is prioritized over voltage range. |
| MAX5033BASA+ | 100V max input, 125mA output, no programmable current limit, SO-8 package | Lower current capacity and fixed 5V/3.3V outputs only; no adjustable mode or FBO | Choose for cost-sensitive, low-current ≤100V applications where simplicity outweighs scalability. |
Compared with LTC3639EMSE#TRPBF and MAX5033BASA+, the LTC7138EMSE#TRPBF uniquely combines 140V input tolerance, 400mA output, programmable current limit, and FBO-based current scaling - making it the only option for high-reliability, high-voltage, scalable industrial and automotive power rails.
Availability
LTC7138EMSE#TRPBF is available at Aetrix Electronics and suitable for industrial control supplies, avionics power conversion, and automotive battery monitoring systems requiring stable component supply across extended temperature ranges and high-voltage operation.
Supply support for LTC7138EMSE#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 LTC7138EMSE#TRPBF belongs to Analog Devices' Power by Linear™ high-voltage DC/DC regulator family, designed specifically for rugged, wide-input industrial and automotive power conversion where reliability, efficiency, and thermal resilience are non-negotiable.
FAQ
What is the absolute maximum input voltage rating for the LTC7138EMSE#TRPBF?
The LTC7138EMSE#TRPBF has an absolute maximum input voltage rating of 140V on the VIN pin, as specified in the Absolute Maximum Ratings table. This allows direct regulation from high-voltage sources such as rectified AC lines, telecom batteries, or multi-cell battery stacks without external pre-regulation. Operation above 140V risks permanent device damage.
How does the LTC7138EMSE#TRPBF achieve 12µA quiescent current?
The LTC7138EMSE#TRPBF 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, reducing VIN supply current to just 12µA. The feedback comparator wakes the device only when VFB falls 5mV below the 0.8V reference, minimizing average current draw.
Can the LTC7138EMSE#TRPBF be used in parallel to increase output current?
Yes, the LTC7138EMSE#TRPBF supports parallel operation via its FBO (feedback comparator output) pin. Connecting the FBO of a master LTC7138EMSE#TRPBF to the VFB pins of slave units synchronizes switching and balances current, enabling scalable output up to 400mA × N. Each unit must have identical feedback networks and layout symmetry for optimal sharing.
What is the purpose of the ANODE pin on the LTC7138EMSE#TRPBF?
On the LTC7138EMSE#TRPBF, the ANODE pin (Pin 16) connects to the anode of the external catch diode and contains an internal sense resistor tied to the exposed GND pad. It enables accurate valley current detection during inductor discharge, which is essential for stable Burst Mode® operation and inherent short-circuit protection without external sensing components.
Does the LTC7138EMSE#TRPBF require external compensation components?
No, the LTC7138EMSE#TRPBF requires no external compensation components. Its hysteretic current-mode control architecture with integrated feedback comparator and valley-current sensing eliminates the need for loop compensation networks. This simplifies design, reduces BOM count, and improves reliability across temperature and load variations.
LTC7138EMSE#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:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LTC7138EMSE#TRPBF FAQ
1.How can I place an order for LTC7138EMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7138EMSE#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 LTC7138EMSE#TRPBF reliable?
The price and inventory of LTC7138EMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7138EMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC7138EMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7138EMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7138EMSE#TRPBF?
LTC7138EMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7138EMSE#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 LTC7138EMSE#TRPBF?
For technical support, including LTC7138EMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7138EMSE#TRPBF requirements.
6.How does Aetrix verify that LTC7138EMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC7138EMSE#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 LTC7138EMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC7138EMSE#TRPBF?
All LTC7138EMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7138EMSE#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 LTC7138EMSE#TRPBF part is unused and in its original packaging.
Return procedure for LTC7138EMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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