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Analog Devices Inc. LTC7138IMSE#PBF
- Part No.:
- LTC7138IMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width), 12 Leads, Exposed Pad
- Datasheet:
-
LTC7138IMSE#PBF.pdf
- Description:
- IC REG BUCK ADJ 400MA 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,441
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Product details
Overview
LTC7138IMSE#PBF from Analog Devices is a high-efficiency, 140V-input, 400mA synchronous step-down DC/DC regulator with integrated P-channel MOSFET, 12µA quiescent current in Burst Mode®, 0.8V ±1% feedback reference, and programmable peak current limit (140–610mA). It operates across 4V–140V input and supports adjustable or fixed 1.8V/3.3V/5V outputs, targeting industrial power supplies and automotive subsystems.
For engineers reviewing the LTC7138IMSE#PBF datasheet, LTC7138IMSE#PBF pinout, LTC7138IMSE#PBF application, or LTC7138IMSE#PBF equivalent, key selection criteria include wide VIN range (4–140V), AEC-Q100 qualification (I-grade), thermally enhanced 16-lead MSE package with exposed pad, programmable OVLO/RUN thresholds, and parallel operation capability via FBO pin.
Technical Context
The LTC7138IMSE#PBF employs Burst Mode® control with hysteretic feedback to achieve ultra-low 12µA no-load supply current while maintaining regulation. Its internal P-channel MOSFET enables 100% duty-cycle dropout operation, supporting output voltages up to VIN.
Peak and valley current thresholds are programmable via ISET (140–610mA peak, 50–75% valley ratio), directly determining maximum average output current (100–405mA). The RUN and OVLO pins provide precise, independent input voltage monitoring with 110mV hysteresis each, enabling robust undervoltage lockout and overvoltage protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 140V - supports direct regulation from unregulated industrial rails, battery stacks, or PoE-derived supplies without pre-regulation. |
| Max Output Current | 400mA - achievable with ISET floating; reduced to 100mA when ISET grounded, enabling scalable design for low-power nodes. |
| Quiescent Current | 12µA typical in Burst Mode® - sustains regulation during standby in always-on systems (e.g., automotive body controllers) with minimal battery drain. |
| Feedback Reference | 0.8V ±1% - enables precise output voltage setting down to 0.8V with external resistor divider; fixed outputs (1.8V/3.3V/5V) require no external resistors. |
| Switch On-Resistance | 1.8Ω typical - limits conduction loss at full load; combined with 140V rating, ensures safe operation under high-voltage transients. |
| Operating Temp Range | –40°C to +125°C - qualified per AEC-Q100 Grade I, suitable for under-hood automotive and industrial environments without derating. |
| Package | 16-lead MSE (MSOP-16 variant with 4 missing pins), exposed pad (Pin 17) tied to GND - provides low θJA = 40°C/W for high-power-density thermal management. |
Pinout & Package
The LTC7138IMSE#PBF is housed in a thermally enhanced 16-lead MSE package (MSE16 variant), featuring an exposed GND pad (Pin 17) that must be soldered to PCB ground for rated electrical performance and thermal dissipation (θJC = 10°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (1) | Switch Node | Drain of internal P-MOSFET; connects to inductor and catch diode cathode; carries high dv/dt switching waveform. |
| VIN (3) | Main Input Supply | Accepts 4–140V input; requires local ceramic bypass capacitor to GND for stability and transient response. |
| FBO (5) | Feedback Comparator Output | Open-drain output (20µA pull-up, 70Ω pull-down) for master-slave paralleling of multiple LTC7138IMSE#PBF units. |
| VPRG1/VPRG2 (6,7) | Output Voltage Selection | Configures fixed 1.8V/3.3V/5V or adjustable output by grounding or tying to SS pin; eliminates external feedback resistors for standard outputs. |
| GND (8,17) | Ground Reference | Pins 8 and 17 (exposed pad) are internally connected; exposed pad must be soldered to PCB ground plane for thermal and EMI performance. |
| VFB (9) | Feedback Input | Compares divided output voltage against 0.8V reference; shorted to VOUT for fixed-output mode; connected to resistor divider for adjustable mode. |
| SS (10) | Soft-Start Control | Capacitor-to-GND sets output ramp time (1ms per 6.25nF); internal 1ms default if floating; resets on UVLO/OVLO events. |
| ISET (11) | Peak Current Programming | Resistor-to-GND sets peak inductor current (140–610mA); valley current tracks at ~60%; determines max output current and ripple trade-off. |
| OVLO (12) | Overvoltage Lockout Input | Resistive divider from VIN sets disable threshold (1.21V rising); triggers soft-start reset for graceful recovery from input surges. |
| RUN (14) | Enable/Undervoltage Control | Resistive divider sets enable threshold (1.21V rising, 1.10V falling); forces shutdown below 0.7V, reducing IQ to 1.4µA. |
| ANODE (16) | Catch Diode Anode Sense | Connects to cathode of external Schottky diode; internal sense resistor enables accurate valley current detection. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® Operation | Reduces no-load IQ to 12µA while maintaining regulation-critical for battery-backed systems requiring multi-year standby life. |
| Programmable Peak Current Limit | Adjusts max output current from 100mA to 405mA via single ISET resistor-optimizes inductor size, efficiency, and output ripple per application load. |
| Integrated P-Channel MOSFET | 1.8Ω RDS(on) enables 100% duty-cycle dropout operation-supports output regulation even as input drops near VOUT (e.g., 5.5V→5V). |
| AEC-Q100 Qualified (Grade I) | Validated for –40°C to +125°C operation with automotive reliability testing-enables use in engine control modules, ADAS sensors, and infotainment power rails. |
| Parallel Operation Support | FBO pin allows master-slave configuration of multiple LTC7138IMSE#PBF units-scales output current beyond 400mA without external current-sharing circuitry. |
Applications
| Industrial Control Power | Automotive Body Electronics |
|---|---|
|
Use Scenario: Powering PLC I/O modules, sensor transmitters, and fieldbus interfaces from 24V–72V industrial rails subject to load dumps and cold-crank transients. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator delivering stable 3.3V/5V to microcontrollers and analog front-ends. Use Value: 140V absolute max rating and programmable OVLO withstand 100V+ transients; 12µA IQ extends backup battery life in remote telemetry nodes. |
Use Scenario: Supplying door modules, seat controllers, and lighting ECUs in vehicles where input voltage ranges from 5.5V (cold crank) to 45V (load dump). IC Role / Device Role / Timing Role: High-voltage buck converter generating 5V for CAN transceivers and 3.3V for MCU cores in AEC-Q100-compliant designs. Use Value: –40°C to +125°C operation and built-in RUN/OVLO monitoring ensure reliable startup and fault recovery across automotive temperature extremes. |
| Distributed Medical Power | Avionics Power Conditioning |
|
Use Scenario: Providing isolated auxiliary power in portable ultrasound and patient monitors using 12V–48V battery packs with strict low-noise and low-quiescent requirements. IC Role / Device Role / Timing Role: Efficient intermediate bus converter stepping down battery voltage to 1.8V/3.3V for ADCs, displays, and wireless SoCs. Use Value: Adjustable output and 0.8V reference enable precision low-voltage rails; Burst Mode® minimizes self-heating in sealed enclosures. |
Use Scenario: Regulating 28V aircraft bus to 5V/3.3V for flight control sensors and communication interfaces operating in high-reliability, vibration-prone environments. IC Role / Device Role / Timing Role: Robust primary DC/DC regulator with thermal shutdown and input monitoring for safety-critical avionics subsystems. Use Value: Exposed-pad MSE package ensures thermal stability at altitude; AEC-Q100 qualification aligns with DO-160 environmental test rigor. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3639EMSE#PBF | Lower max VIN (60V), higher IQ (25µA), same 400mA output; uses N-MOSFET with external bootstrap. | Suitable for 24V/48V systems but not 72V+ industrial or automotive load-dump scenarios. | Select when input voltage stays ≤60V and board space allows external bootstrap capacitor. |
| MAX5033BASA+ | 100V max VIN, 125mA output, no programmable current limit, fixed 3.3V/5V only; no Burst Mode®. | Targeted at low-current, cost-sensitive applications where 400mA and ultra-low IQ are unnecessary. | Choose for simple, low-cost 100V buck where efficiency at light loads is secondary. |
Compared with LTC3639EMSE#PBF and MAX5033BASA+, the LTC7138IMSE#PBF uniquely combines 140V operation, 400mA output, 12µA IQ, and AEC-Q100 qualification-making it the only option for high-reliability, high-voltage, medium-current automotive and industrial buck conversion.
Availability
LTC7138IMSE#PBF is available at Aetrix Electronics and suitable for industrial control supplies, automotive body electronics, and distributed medical power systems requiring stable component supply across extended temperature and voltage ranges.
Supply support for LTC7138IMSE#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC7138IMSE#PBF belongs to Analog Devices' Power by Linear™ high-voltage DC/DC regulator family, designed specifically for robust, efficient power conversion in harsh environments with wide input voltage ranges and stringent reliability requirements.
FAQ
What is the maximum input voltage rating for the LTC7138IMSE#PBF?
The LTC7138IMSE#PBF has an absolute maximum input voltage rating of 140V, with a functional operating range from 4V to 140V. This enables direct regulation from high-voltage sources such as 48V telecom systems, 72V industrial buses, or automotive load-dump transients without external clamping. Operation above 140V risks permanent damage per Absolute Maximum Ratings.
How does the LTC7138IMSE#PBF achieve ultra-low quiescent current?
The LTC7138IMSE#PBF achieves 12µA typical quiescent current in Burst Mode® operation by disabling the power switch and current comparators during sleep cycles, leaving only essential bias circuitry active. When output voltage droop triggers feedback comparator wake-up, short burst cycles restore regulation-minimizing average supply current while maintaining tight output tolerance.
Can the LTC7138IMSE#PBF be used in automotive applications?
Yes, the LTC7138IMSE#PBF is AEC-Q100 qualified for Grade I (–40°C to +125°C) and features programmable RUN and OVLO pins for precise input monitoring-making it suitable for automotive body electronics, ADAS sensors, and infotainment power rails. Its 140V rating withstands load-dump transients, and the exposed-pad MSE package ensures thermal stability under hood conditions.
What is the purpose of the FBO pin on the LTC7138IMSE#PBF?
The FBO (Feedback Comparator Output) pin on the LTC7138IMSE#PBF is an open-drain output that enables master-slave paralleling of multiple devices. Connecting the FBO of a master LTC7138IMSE#PBF to the VFB pins of slave units synchronizes regulation and scales total output current linearly-e.g., two LTC7138IMSE#PBF units deliver 800mA without external current-sharing components.
How is output voltage configured on the LTC7138IMSE#PBF?
Output voltage on the LTC7138IMSE#PBF is configured via VPRG1 and VPRG2 pins: short both to GND for adjustable output (0.8V–VIN); tie VPRG1 to SS and VPRG2 to GND for 5V; tie VPRG1 to GND and VPRG2 to SS for 3.3V; tie both to SS for 1.8V. No external resistors are needed for fixed outputs, simplifying layout and improving noise immunity.
LTC7138IMSE#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:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LTC7138IMSE#PBF FAQ
1.How can I place an order for LTC7138IMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7138IMSE#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 LTC7138IMSE#PBF reliable?
The price and inventory of LTC7138IMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7138IMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC7138IMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7138IMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7138IMSE#PBF?
LTC7138IMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7138IMSE#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 LTC7138IMSE#PBF?
For technical support, including LTC7138IMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7138IMSE#PBF requirements.
6.How does Aetrix verify that LTC7138IMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC7138IMSE#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 LTC7138IMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC7138IMSE#PBF?
All LTC7138IMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7138IMSE#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 LTC7138IMSE#PBF part is unused and in its original packaging.
Return procedure for LTC7138IMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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