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Analog Devices Inc. LTC7138HMSE#TRPBF
- Part No.:
- LTC7138HMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width), 12 Leads, Exposed Pad
- Datasheet:
-
LTC7138HMSE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 400MA 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,571
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Product details
Overview
LTC7138HMSE#TRPBF 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®, programmable peak current limit (140–610mA), and 0.8V ±1% feedback reference. It operates across 4V–140V input and delivers adjustable or fixed 1.8V/3.3V/5V outputs, suited for automotive power supplies where wide VIN and AEC-Q100 compliance are critical.
For engineers reviewing the LTC7138HMSE#TRPBF datasheet, LTC7138HMSE#TRPBF pinout, LTC7138HMSE#TRPBF application, or LTC7138HMSE#TRPBF equivalent, key selection considerations include its –40°C to 150°C junction temperature rating, programmable OVLO/RUN thresholds, internal soft-start, parallel operation via FBO pin, and thermally enhanced 16-lead MSE package with exposed GND pad.
Technical Context
The LTC7138HMSE#TRPBF implements Burst Mode® control with hysteretic feedback, enabling ultra-low 12µA no-load IQ while maintaining regulation. Its P-channel MOSFET architecture supports 100% duty cycle dropout operation and eliminates external bootstrap components.
Peak and valley current thresholds are set via ISET pin (5µA current source), with valley tracking at 60% of peak; output voltage is selected via VPRG1/VPRG2 logic states (ground/SS) for 1.8V/3.3V/5V or resistive divider for adjustable mode. RUN and OVLO pins provide precise, independently programmable enable and overvoltage lockout functions with 110mV hysteresis.
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 540mA peak / 270mA valley current limits when ISET open; scalable via parallel FBO connection. |
| Quiescent Current | 12µA typical in Burst Mode® - sustains battery-powered systems for extended periods without significant drain. |
| Feedback Reference | 0.800V ±1% - sets precise output accuracy for adjustable configurations; enables 1.8V/3.3V/5V fixed outputs via VPRG pins. |
| Operating Temp Range | –40°C to 150°C junction - qualified per AEC-Q100 Grade H, supporting under-hood automotive and high-temp industrial environments. |
| Switch RON | 1.8Ω typical - low conduction loss at high input voltages; optimized for efficiency in 48V–140V input applications. |
| Soft-Start Time | 1ms internal default - prevents input supply droop during startup; externally adjustable via SS pin capacitor. |
Pinout & Package
The LTC7138HMSE#TRPBF is housed in a thermally enhanced 16-lead plastic MSOP (MSE) package with four missing pins (pins 2, 4, 13, 15) and an exposed GND pad (pin 17) requiring PCB soldering for thermal and electrical performance.
| 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 4V–140V; requires local ceramic bypass capacitor to GND for stability and EMI suppression. |
| FBO (5) | Feedback comparator output | Open-drain output (20µA pull-up, 70Ω pull-down); enables master-slave parallel operation of multiple LTC7138HMSE#TRPBF units. |
| VPRG2 (6), VPRG1 (7) | Output voltage selection | Logic inputs defining fixed output: both GND = adjustable; VPRG1=SS/VPRG2=GND = 5V; VPRG1=GND/VPRG2=SS = 3.3V; both SS = 1.8V. |
| GND (8, 17) | Ground reference | Pins 8 and 17 (exposed pad) are internally connected; pad must be soldered to PCB ground plane for thermal dissipation and noise immunity. |
| VFB (9) | Feedback input | Compares divided output voltage to 0.8V reference; directly tied to output for fixed-voltage modes; connects to resistor divider for adjustable mode. |
| SS (10) | Soft-start control | Capacitor-to-GND sets ramp time (1ms per 6.25nF); 5µA charging current ensures controlled VOUT rise and minimizes input surge. |
| ISET (11) | Peak current programming | 5µA current source to GND sets peak inductor current (140–610mA); valley current tracks at 60%; enables optimization for ripple, size, or efficiency. |
| OVLO (12) | Overvoltage lockout input | Resistor-divider input; disables switching if >1.21V; resets soft-start on recovery; protects downstream circuitry from input transients. |
| RUN (14) | Enable/disable control | Undervoltage lockout threshold (1.21V rising); shutdown draws only 1.4µA; hysteresis prevents chatter near threshold. |
| 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 always-on automotive modules and battery backup systems. |
| Programmable peak current limit | Adjusts max output from 100mA to 400mA via single ISET resistor-optimizes inductor size, output ripple, and light-load efficiency. |
| 100% duty cycle dropout | Enables regulation down to VOUT ≈ VIN using internal P-MOSFET-eliminates need for external LDO post-regulator in high-VIN systems. |
| Parallel operation support | FBO pin allows seamless current sharing across multiple LTC7138HMSE#TRPBF regulators-scales output beyond 400mA without complex current-sense circuitry. |
| AEC-Q100 Grade H qualification | Validated for –40°C to 150°C operation with full automotive reliability testing-meets requirements for engine control, ADAS, and body electronics. |
Applications
| Automotive Engine Control Unit (ECU) Power Supply | Industrial 48V–140V Distributed Power Rail |
|---|---|
|
Use Scenario: Regulating raw vehicle battery (9V–16V) or 48V mild-hybrid bus up to 140V transient surges into stable 3.3V for microcontroller and sensor rails. IC Role / Device Role / Timing Role: Primary step-down regulator with integrated switch, providing isolated, low-noise, high-reliability power with AEC-Q100 compliance. Use Value: Eliminates external high-voltage pre-regulator; withstands load dump (140V) without shutdown; 12µA IQ extends battery life in sleep mode. |
Use Scenario: Converting unregulated 48V/72V/96V industrial bus to 5V for PLC I/O modules, motor drives, or fieldbus interfaces operating in harsh ambient temperatures. IC Role / Device Role / Timing Role: High-input-voltage buck controller delivering robust, thermally efficient power with programmable OVLO to reject line surges. Use Value: 150°C-rated operation ensures reliability in enclosed cabinets; parallel FBO capability scales current for multi-rail systems without redesign. |
| Avionics Remote Power Node | Medical Portable Diagnostic Equipment |
|
Use Scenario: Powering FPGA, ADC, and RF front-end in airborne data acquisition units fed from 28V aircraft bus with 100V+ lightning-induced transients. IC Role / Device Role / Timing Role: Transient-hardened DC/DC regulator with precise RUN threshold and soft-start to meet DO-160 Section 22 surge immunity requirements. Use Value: 140V absolute max rating and programmable OVLO prevent false trips during transients; exposed pad enhances thermal margin at altitude. |
Use Scenario: Battery-powered ultrasound or patient monitor subsystem requiring quiet, long-life 1.8V/3.3V rails from 12V Li-ion pack with variable state-of-charge (10V–12.6V). IC Role / Device Role / Timing Role: Low-IQ step-down regulator with adjustable output and internal soft-start to avoid brownouts during wake-up sequences. Use Value: 12µA Burst Mode® IQ doubles battery runtime vs. conventional buck ICs; fixed 1.8V/3.3V options reduce BOM count and layout sensitivity. |
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 |
|---|---|---|---|
| LTC3639EMSE#TRPBF | 60V max input, 500mA output, 15µA IQ, no programmable OVLO/RUN, same MSE package. | Not suitable for >60V inputs (e.g., 140V load dump); lacks independent OVLO pin and AEC-Q100 H-grade rating. | Select only for ≤60V industrial or telecom applications where lower cost and higher current outweigh voltage range needs. |
| MAX5033BASA+ | 76V max input, 125mA output, 100µA IQ, no programmable current limit, SO-8 package. | Insufficient output current for 400mA loads; higher IQ reduces battery life; smaller package limits thermal handling at high VIN. | Consider only for space-constrained, low-current auxiliary rails where 76V ceiling is acceptable and thermal derating is managed externally. |
Compared with LTC3639EMSE#TRPBF and MAX5033BASA+, the LTC7138HMSE#TRPBF uniquely combines 140V input tolerance, 400mA output, 12µA IQ, AEC-Q100 Grade H qualification, and programmable OVLO/RUN-making it the sole option for automotive under-hood and high-transient industrial buck regulation.
Availability
LTC7138HMSE#TRPBF is available at Aetrix Electronics and suitable for automotive ECU power supplies, industrial 48V–140V distributed power systems, avionics remote nodes, medical portable diagnostics, and high-reliability embedded control requiring stable component supply across extended temperature and voltage ranges.
Supply support for LTC7138HMSE#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 with precision power, signal chain, and RF solutions.
The LTC7138HMSE#TRPBF belongs to Analog Devices' Power by Linear™ high-voltage DC/DC regulator family, designed specifically for robust, wide-input-voltage power conversion in automotive, industrial, and aerospace applications where reliability under extreme conditions is non-negotiable.
FAQ
What is the maximum input voltage rating for the LTC7138HMSE#TRPBF?
The LTC7138HMSE#TRPBF has an absolute maximum input voltage rating of 140V, with guaranteed operation from 4V to 140V. This allows direct regulation from automotive battery systems-including 12V, 24V, and 48V architectures-as well as industrial and avionics buses subject to high-energy transients like load dump. The device remains functional and protected up to this limit when used within its specified thermal and layout constraints.
How does the LTC7138HMSE#TRPBF achieve 12µA quiescent current?
The LTC7138HMSE#TRPBF achieves 12µA typical quiescent current through Burst Mode® operation: during light loads, it enters a sleep cycle where the internal power switch and current comparators are disabled, leaving only essential bias circuitry active. This ultra-low IQ is maintained while preserving output regulation-enabling multi-year battery life in always-on automotive and portable medical devices powered by the LTC7138HMSE#TRPBF.
Can the LTC7138HMSE#TRPBF be used in parallel for higher current output?
Yes, the LTC7138HMSE#TRPBF supports parallel operation via its FBO (feedback comparator output) pin. Connecting the FBO of a master LTC7138HMSE#TRPBF to the VFB pins of one or more slave units forces current sharing, scaling total output to 400mA × N. No external current-sense resistors or complex control loops are required-this feature is built into the LTC7138HMSE#TRPBF's architecture for seamless, stable multi-phase operation.
What is the purpose of the ANODE pin on the LTC7138HMSE#TRPBF?
The ANODE pin on the LTC7138HMSE#TRPBF connects to the cathode of the external catch diode and provides an internal sense path to GND. It enables accurate valley current detection by measuring voltage drop across an internal sense resistor, which is critical for stable Burst Mode® operation and inherent short-circuit protection. Proper routing of the ANODE trace-minimizing inductance and avoiding noisy nodes-is essential for reliable LTC7138HMSE#TRPBF performance.
Does the LTC7138HMSE#TRPBF require external compensation components?
No, the LTC7138HMSE#TRPBF requires no external compensation components. Its current-mode control architecture with integrated feedback loop compensation eliminates the need for external Type II or Type III compensation networks. This simplifies design, reduces BOM count, improves noise immunity, and accelerates time-to-market-key advantages confirmed in the official LTC7138HMSE#TRPBF datasheet and application schematics.
LTC7138HMSE#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LTC7138HMSE#TRPBF FAQ
1.How can I place an order for LTC7138HMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7138HMSE#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 LTC7138HMSE#TRPBF reliable?
The price and inventory of LTC7138HMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7138HMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC7138HMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7138HMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7138HMSE#TRPBF?
LTC7138HMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7138HMSE#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 LTC7138HMSE#TRPBF?
For technical support, including LTC7138HMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7138HMSE#TRPBF requirements.
6.How does Aetrix verify that LTC7138HMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC7138HMSE#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 LTC7138HMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC7138HMSE#TRPBF?
All LTC7138HMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7138HMSE#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 LTC7138HMSE#TRPBF part is unused and in its original packaging.
Return procedure for LTC7138HMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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