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Analog Devices Inc. LTC7138HMSE#PBF
- Part No.:
- LTC7138HMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width), 12 Leads, Exposed Pad
- Datasheet:
-
LTC7138HMSE#PBF.pdf
- Description:
- IC REG BUCK ADJ 400MA 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:465
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Product details
Overview
LTC7138HMSE#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 –40°C to +150°C and supports adjustable or fixed 1.8V/3.3V/5V outputs in industrial power supplies.
For engineers reviewing the LTC7138HMSE#PBF datasheet, LTC7138HMSE#PBF pinout, LTC7138HMSE#PBF application, or LTC7138HMSE#PBF equivalent, key selection considerations include its 4V–140V input range, thermally enhanced MSE package with exposed GND pad, AEC-Q100-qualified H-grade temperature rating, and parallel operation capability via FBO pin for higher-current designs.
Technical Context
The LTC7138HMSE#PBF implements 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 eliminates external high-side switch requirements.
Peak and valley current thresholds are programmable via ISET (5µA current source), with valley current tracking at ~60% of peak. The RUN and OVLO pins provide precise, independently configurable undervoltage and overvoltage lockout using resistor dividers, and the FBO pin enables master-slave current sharing across multiple units.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 140V - enables direct regulation from unregulated industrial, automotive, or avionics bus voltages without pre-regulation. |
| Max Output Current | 400mA average - determined by 610mA peak / 270mA valley current limits; scalable to higher current via FBO-parallel configuration. |
| Quiescent Current | 12µA typical in Burst Mode® - sustains regulation at microamp-level loads ideal for always-on battery-backed systems. |
| Feedback Reference | 0.800V ±1% - sets output voltage accuracy in adjustable mode; enables stable 1.8V/3.3V/5V fixed outputs via VPRG1/VPRG2 pin strapping. |
| Operating Temp Range | –40°C to +150°C - qualified for harsh-environment applications including under-hood automotive and industrial controls. |
| Switch On-Resistance | 1.8Ω typical - low RDS(on) minimizes conduction loss at high input voltages and moderate load currents. |
| Soft-Start Time | 1ms internal default - prevents input droop during startup; externally adjustable via SS pin capacitor (6.25nF = 1ms ramp). |
Pinout & Package
The LTC7138HMSE#PBF is housed in a thermally enhanced 16-lead plastic MSOP (MSE) package with four missing pins (pins 2, 4, 13, 15), exposing a GND-connected thermal pad (Pin 17) that must be soldered to PCB ground for rated thermal performance (θJA = 40°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. |
| VIN (3) | Main Input Supply | Accepts 4V–140V; requires local ceramic bypass capacitor to GND for stability and EMI reduction. |
| FBO (5) | Feedback Comparator Output | Open-drain output (20µA pull-up, 70Ω pull-down); enables current sharing by connecting to VFB of slave devices. |
| VPRG1/VPRG2 (6,7) | Output Voltage Selection | Strap combinations select 1.8V/3.3V/5V fixed outputs or enable adjustable mode when both grounded. |
| GND (8,17) | Ground Reference | Pins 8 and 17 (exposed pad) are internally connected; pad must be soldered to PCB ground plane for thermal and electrical integrity. |
| VFB (9) | Feedback Input | Compares divided output voltage to 0.8V reference; directly tied to output in fixed-voltage configurations. |
| SS (10) | Soft-Start Control | Capacitor-to-GND sets output ramp time (1ms per 6.25nF); floating defaults to internal 1ms soft-start. |
| ISET (11) | Peak Current Programming | 5µA current source to GND sets peak current threshold (140–610mA); valley current tracks at ~60%. |
| OVLO (12) | Overvoltage Lockout Input | Resistor divider from VIN sets shutdown threshold (1.21V rising); triggers soft-start reset on overvoltage transients. |
| RUN (14) | Enable/Undervoltage Control | Resistor divider sets turn-on threshold (1.21V rising) and hysteresis (110mV); <0.7V forces shutdown (1.4µA IQ). |
| ANODE (16) | Catch Diode Anode Sense | Connects to anode 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-powered and energy-harvesting systems. |
| Programmable Peak Current Limit | Adjusts max output from 100mA to 400mA via single ISET resistor-optimizes efficiency, ripple, and inductor size per application. |
| 100% Duty Cycle Dropout | Enables regulation down to VOUT = VIN − VDS(on)-supports wide-input systems operating near minimum input voltage. |
| Parallel Operation Support | FBO pin allows master-slave synchronization of multiple LTC7138HMSE#PBF units-scales output current without redesigning magnetics. |
| AEC-Q100 Qualified H-Grade | Rated for –40°C to +150°C junction temperature-meets automotive reliability requirements for engine control and ADAS power rails. |
Applications
| Industrial Control Power | Automotive Body Electronics |
|---|---|
|
Use Scenario: Regulating 24V/48V industrial bus to 3.3V for PLC I/O modules and sensor interfaces in factory automation cabinets. IC Role / Device Role / Timing Role: Primary non-isolated buck converter delivering clean, regulated 3.3V at up to 400mA with minimal external components. Use Value: Eliminates need for pre-regulator stages due to 140V max input rating and withstands 100V transients common in industrial environments. |
Use Scenario: Powering infotainment display backlight drivers and CAN transceivers from 12V battery with cold-crank tolerance. IC Role / Device Role / Timing Role: High-voltage buck regulator with programmable UVLO (via RUN pin) to maintain operation down to 4.5V during cranking. Use Value: 12µA quiescent current extends battery life in always-on modules; AEC-Q100 H-grade ensures reliability under hood temperatures. |
| Distributed Avionics Power | Portable Medical Instrumentation |
|
Use Scenario: Converting 28V aircraft bus to 5V for flight data recorder interface logic and memory subsystems. IC Role / Device Role / Timing Role: Robust primary DC/DC stage with OVLO (via OVLO pin) configured to suppress switching during 100V+ lightning-induced transients. Use Value: 140V absolute max rating and integrated overvoltage protection reduce need for external TVS clamping networks. |
Use Scenario: Generating 1.8V core supply for low-power ARM Cortex-M microcontrollers in handheld ultrasound probes. IC Role / Device Role / Timing Role: Ultra-low-IQ buck regulator enabling multi-day battery life; adjustable output supports varying SoC voltage requirements. Use Value: Programmable peak current (ISET) allows optimization for 100mA–400mA loads-reducing inductor size and output ripple simultaneously. |
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#PBF | Lower 60V max input; 500mA output; no programmable peak current; requires external compensation. | Best suited for ≤60V systems where smaller footprint and lower cost outweigh need for 140V rating or ISET flexibility. | Select when input voltage never exceeds 60V and fixed 500mA output suffices without current programming. |
| MAX5033BASA+ | 76V max input; 125mA output; no Burst Mode®; higher 100µA IQ; SO-8 package. | Targeted at space-constrained, lower-current applications where thermal performance and ultra-low IQ are secondary. | Choose only for ≤76V, <125mA designs where MSOP thermal pad and 12µA IQ are not required. |
Compared with LTC3639EMSE#PBF and MAX5033BASA+, the LTC7138HMSE#PBF uniquely delivers 140V operation, 400mA output with programmable current limiting, and 12µA Burst Mode® IQ in a thermally optimized MSE package-making it the sole option for high-reliability, wide-input, medium-current industrial and automotive power rails.
Availability
LTC7138HMSE#PBF is available at Aetrix Electronics and suitable for industrial control supplies, automotive body electronics, distributed avionics power, and portable medical instrumentation requiring stable component supply across extended temperature ranges.
Supply support for LTC7138HMSE#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 LTC7138HMSE#PBF belongs to Analog Devices' high-voltage monolithic DC/DC regulator product line, designed specifically for robust, efficient power conversion in harsh environments where wide input range, low quiescent current, and AEC-Q100 qualification are mandatory.
FAQ
What is the maximum input voltage rating for the LTC7138HMSE#PBF?
The LTC7138HMSE#PBF has an absolute maximum input voltage rating of 140V, with guaranteed operation from 4V to 140V. This enables direct regulation from high-voltage industrial buses, automotive 48V systems, and avionics 28V/115VAC-derived supplies without external pre-regulation stages. Exceeding 140V risks permanent damage per Absolute Maximum Ratings.
How does the ISET pin configure output current on the LTC7138HMSE#PBF?
The ISET pin on the LTC7138HMSE#PBF sources a 5µA current (1µA in sleep mode) to ground through an external resistor, setting the peak inductor current threshold between 140mA and 610mA. The resulting average output current ranges from 100mA to 400mA, with valley current tracking at ~60% of peak. Shorting ISET to GND yields minimum current; leaving it open yields maximum.
Can the LTC7138HMSE#PBF operate in 100% duty cycle dropout mode?
Yes, the LTC7138HMSE#PBF supports 100% duty cycle operation using its internal P-channel MOSFET switch. When input voltage approaches output voltage, the controller maintains regulation by holding the switch continuously on-enabling stable output down to VIN − VDS(on) ≈ VOUT, critical for brownout resilience in wide-input applications.
What is the purpose of the FBO pin on the LTC7138HMSE#PBF?
The FBO (Feedback Comparator Output) pin on the LTC7138HMSE#PBF is an open-drain output used to synchronize multiple LTC7138HMSE#PBF units in parallel. Connecting the FBO of a master device to the VFB pins of slave devices forces current sharing, scaling total output current linearly (e.g., two units deliver 800mA) while maintaining tight voltage regulation and transient response.
Is the LTC7138HMSE#PBF qualified for automotive applications?
Yes, the LTC7138HMSE#PBF is AEC-Q100 qualified for automotive applications and rated for operation from –40°C to +150°C junction temperature. Its H-grade temperature specification, integrated OVLO/RUN monitoring, and robust 140V input handling make it suitable for under-hood engine control units, ADAS camera modules, and body electronics requiring long-term reliability in harsh thermal environments.
LTC7138HMSE#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LTC7138HMSE#PBF FAQ
1.How can I place an order for LTC7138HMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7138HMSE#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 LTC7138HMSE#PBF reliable?
The price and inventory of LTC7138HMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7138HMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC7138HMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7138HMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7138HMSE#PBF?
LTC7138HMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7138HMSE#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 LTC7138HMSE#PBF?
For technical support, including LTC7138HMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7138HMSE#PBF requirements.
6.How does Aetrix verify that LTC7138HMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC7138HMSE#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 LTC7138HMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC7138HMSE#PBF?
All LTC7138HMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7138HMSE#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 LTC7138HMSE#PBF part is unused and in its original packaging.
Return procedure for LTC7138HMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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