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Analog Devices Inc. LTC3111MPMSE#TRPBF
- Part No.:
- LTC3111MPMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3111MPMSE#TRPBF.pdf
- Description:
- IC REG BUCK BST ADJ 1.5A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,114
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Product details
Overview
LTC3111MPMSE#TRPBF from Analog Devices (formerly Linear Technology) is a high-reliability, synchronous 4-switch buck-boost DC/DC converter optimized for wide-input industrial and military power systems. It delivers up to 1.5A continuous output current with 2.5V–15V input and output voltage range, 800kHz fixed switching frequency (synchronizable 600kHz–1.5MHz), and operates across –55°C to +150°C junction temperature. It enables regulated power from single/multi-cell batteries or backup capacitors where VIN may be above, below, or equal to VOUT.
For engineers reviewing the LTC3111MPMSE#TRPBF datasheet, LTC3111MPMSE#TRPBF pinout, LTC3111MPMSE#TRPBF application, or LTC3111MPMSE#TRPBF equivalent, key selection criteria include its extended temperature grade (–55°C to 150°C), 95% peak efficiency, 49µA no-load quiescent current in Burst Mode®, accurate RUN-pin UVLO programming, and seamless buck-boost transition without output discontinuity.
Technical Context
The LTC3111MPMSE#TRPBF implements a proprietary 4-switch, single-inductor architecture that dynamically reconfigures internal N-channel MOSFETs (SW1/SW2/BST1/BST2) to operate in buck, boost, or buck-boost mode-ensuring continuous inductor current and low-noise regulation regardless of VIN-to-VOUT relationship. Its voltage-mode control loop uses an error amplifier with external Type III compensation on the COMP pin and integrates programmable input UVLO via the RUN pin (1.15V enable threshold, 120mV hysteresis).
It features dual protection schemes: an average input current limit (2.3A min) with fast peak current limiting (5.8A typ), reverse current limiting (–1A), thermal shutdown (>175°C), and internal soft-start (2ms nominal). Power delivery is managed by a regulated INTVCC rail (clamped at 4.2V) supplied from VIN or externally, supporting gate drive for all four low-RDS(ON) switches (90mΩ SW1, 105mΩ SW2/C/D).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 15V - supports single/dual/triple Li-ion, alkaline/NiMH stacks, and capacitor-based backup supplies without external level-shifting. |
| Output Voltage Range | 2.5V to 15V - adjustable via FB resistor divider; maintains regulation even when VIN crosses VOUT during battery discharge or line transients. |
| Continuous Output Current | 1.5A at VIN ≥ 5V, VOUT = 5V, PWM mode - sufficient for RF transmitters, FPGA I/O rails, and industrial sensors. |
| Switching Frequency | 800kHz fixed (600kHz–1.5MHz sync-capable) - enables compact magnetics while minimizing EMI in noise-sensitive applications. |
| Quiescent Current | 49µA in Burst Mode® - extends battery life in always-on monitoring systems with intermittent load activity. |
| Operating Temperature | –55°C to +150°C junction - qualified for aerospace, downhole, and high-reliability military platforms requiring extreme thermal resilience. |
| Efficiency | Up to 95% at mid-load - achieved via low-RDS(ON) internal MOSFETs and adaptive mode control, reducing thermal stress in sealed enclosures. |
Pinout & Package
The LTC3111MPMSE#TRPBF is housed in a thermally enhanced 16-lead plastic MSOP package (3mm × 4mm × 1.1mm) with exposed PGND pad (Pin 17) requiring soldering to PCB for optimal thermal performance (θJA = 40°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| COMP (Pin 1) | Error amplifier output | Connects to external Type III compensation network (R-C-R) to stabilize voltage-mode control loop across full VIN/VOUT range. |
| FB (Pin 2) | Feedback reference input | Senses output voltage divider; sets VOUT = 0.8V × (1 + R1/R2); leakage < 50nA ensures accuracy over temperature. |
| SNSGND (Pin 3) | Sense ground reference | Provides dedicated low-noise ground return for FB and RUN dividers-must be isolated from power ground paths. |
| RUN (Pin 4) | Enable/UVLO programming input | Configurable turn-on threshold (1.15V rising) with 120mV hysteresis; enables precise input brown-in/brown-out control. |
| VIN (Pin 5) | Main input supply | Accepts 2.5V–15V; requires ≥10µF low-ESR ceramic bypass close to pin to suppress high-frequency switching noise. |
| SW1 (Pin 6) | Inductor connection node A | Connects to one end of external inductor and internal switches A/B; voltage swings between VIN and GND in buck mode. |
| BST1 (Pin 7) | Bootstrap supply for switch A | Requires 0.1µF ceramic capacitor to SW1 to generate gate drive voltage > VIN for high-side N-MOSFET A. |
| BST2 (Pin 10) | Bootstrap supply for switch D | Requires 0.1µF ceramic capacitor to SW2 to generate gate drive voltage > VOUT for high-side N-MOSFET D. |
| SW2 (Pin 11) | Inductor connection node B | Connects to other end of external inductor and internal switches C/D; voltage swings between VOUT and GND in boost mode. |
| VOUT (Pin 12) | Regulated output | Delivers stable 2.5V–15V; requires local 22µF low-ESR ceramic capacitor with short ground return path. |
| NC (Pin 13) | No-connect | Internally unconnected; must be tied to SGND per layout guidelines to minimize noise coupling. |
| VCC (Pin 14) | Internal bias supply | Regulated ~4.2V rail powered from VIN or external source; powers control logic and gate drivers; bypass with 1µF ceramic. |
| PWM/SYNC (Pin 15) | Mode control & frequency sync | DC < 0.5V = Burst Mode®; >1.5V = 800kHz PWM; 600kHz–1.5MHz square wave = synchronized operation. |
| SGND (Pin 16) | Signal ground reference | Return for FB and RUN resistor dividers; must be star-connected to SNSGND and isolated from PGND traces. |
| PGND (Pin 17, Exposed Pad) | Power ground | Primary thermal and current return path; must be soldered with multiple vias to large internal/external copper plane. |
Key Features
| Feature | Design Value |
|---|---|
| 4-Switch Single-Inductor Architecture | Enables seamless buck-boost transitions without output voltage droop or inductor current reversal-critical for battery-powered systems with varying state-of-charge. |
| Programmable RUN-Pin UVLO | Allows custom input undervoltage lockout thresholds (e.g., 2.7V cutoff for Li-ion) with built-in 120mV hysteresis to prevent oscillation near threshold. |
| Two-Stage Current Protection | Combines average input current limit (2.3A min) with fast peak current limit (5.8A typ) and reverse current limit (–1A) to survive hard shorts and back-driving events. |
| Thermally Enhanced MSOP Package | Exposed PGND pad and low θJA (40°C/W) enable 1.5A continuous output at –55°C to +150°C without derating in properly designed PCB layouts. |
| Burst Mode® Operation | Reduces no-load input current to 49µA while maintaining regulation-ideal for always-on IoT edge nodes and remote sensors with multi-year battery life targets. |
Applications
| Industrial Battery Backup Systems | RF Power Amplifier Supplies |
|---|---|
Use Scenario: Maintaining 5V/3.3V system power during AC mains failure using supercapacitor or Li-ion backup, where input voltage decays from 12V to 2.7V. IC Role / Device Role / Timing Role: Buck-boost regulator providing uninterrupted regulated output as VIN drops below VOUT during capacitor discharge. Use Value: Eliminates need for separate buck and boost stages; reduces BOM count and board area while ensuring clean, ripple-free power during transition. | Use Scenario: Supplying 5V/1.5A to GaN or LDMOS RF power amplifiers in portable tactical radios operating from 2S/3S Li-ion packs (6V–12.6V). IC Role / Device Role / Timing Role: High-efficiency, low-noise DC/DC converter delivering stable rail despite rapid VIN fluctuations during transmit bursts. Use Value: 95% peak efficiency minimizes thermal load in compact enclosures; 800kHz switching avoids interference with RF bands. |
| Military Vehicle Power Management | Downhole Sensor Electronics |
Use Scenario: Regulating 5V/3.3V for mission-critical avionics and comms modules powered by 24V vehicle bus with ±25% transients and cold-cranking dips to 6V. IC Role / Device Role / Timing Role: Wide-input buck-boost converter maintaining regulation across severe automotive-grade voltage excursions. Use Value: –55°C to +150°C rating ensures operation in unheated compartments; input UVLO prevents brownout resets during engine cranking. | Use Scenario: Powering MEMS accelerometers and telemetry ICs in oil/gas well logging tools exposed to >150°C ambient and limited battery capacity. IC Role / Device Role / Timing Role: High-temperature DC/DC regulator converting 12V battery to 3.3V sensor rail with minimal self-heating. Use Value: 150°C max junction rating and 49µA Burst Mode® quiescent current extend operational lifetime and battery duration in extreme environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3115IFE#TRPBF | Higher 2.5A output current, 2MHz max frequency, but only rated to –40°C to +125°C; uses different pinout and compensation scheme. | Preferred for higher-power, space-constrained designs where extended temperature is not required. | Select if >1.5A output or >1.5MHz switching is needed; verify layout compatibility due to different pin mapping and compensation requirements. |
| MAX20406AATJ+ | 3.5A output, 2.2MHz, integrated inductor option available; rated –40°C to +125°C; lacks programmable RUN-pin UVLO and Burst Mode®. | Better suited for consumer/portable applications needing ultra-small footprint and higher current, not extreme temperature operation. | Choose for cost-sensitive, high-volume designs where thermal grade is secondary to integration and size; confirm absence of Burst Mode® meets standby power needs. |
Compared with LTC3115IFE#TRPBF and MAX20406AATJ+, the LTC3111MPMSE#TRPBF uniquely combines –55°C to +150°C operation, precise RUN-pin UVLO programming, and 49µA Burst Mode® quiescent current-making it irreplaceable for long-life, high-reliability deployments in aerospace, defense, and energy exploration.
Availability
LTC3111MPMSE#TRPBF is available at Aetrix Electronics and suitable for industrial battery backup systems, RF transmitter power supplies, and military vehicle electronics requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3111MPMSE#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 acquired Linear Technology in 2017 and continues to develop high-performance analog, mixed-signal, and power management ICs for demanding applications.
The LTC3111MPMSE#TRPBF belongs to Linear's precision buck-boost regulator product line, engineered specifically for systems requiring seamless voltage regulation across wide input/output ranges and extreme environmental conditions.
FAQ
What is the maximum junction temperature rating for the LTC3111MPMSE#TRPBF?
The LTC3111MPMSE#TRPBF is tested and guaranteed to operate continuously from –55°C to +150°C junction temperature. Thermal shutdown activates at approximately 175°C, and restart occurs at ~170°C. This rating exceeds standard industrial and automotive grades, making the LTC3111MPMSE#TRPBF suitable for downhole, aerospace, and military applications where ambient temperatures exceed 125°C.
Can the LTC3111MPMSE#TRPBF operate with input voltage lower than output voltage?
Yes, the LTC3111MPMSE#TRPBF is explicitly designed for buck-boost operation and regulates stably when VIN is below, above, or equal to VOUT across its full 2.5V–15V range. Its 4-switch architecture automatically configures internal MOSFETs to operate in boost mode when VIN < VOUT, ensuring seamless transition without output interruption or inductor current reversal-verified in typical performance curves Figure G01 and G05.
How does the RUN pin function in the LTC3111MPMSE#TRPBF?
The RUN pin on the LTC3111MPMSE#TRPBF serves dual functions: enabling/disabling the IC and programming custom input UVLO thresholds. It triggers startup when voltage rises above 1.15V (typical, with 120mV hysteresis) and shuts down when falling below 1.08V. A resistive divider from VIN to RUN allows precise brown-in/brown-out control-for example, setting 2.7V cutoff for Li-ion batteries-without external comparators or supervisors.
What is the minimum external inductor value recommended for the LTC3111MPMSE#TRPBF?
The LTC3111MPMSE#TRPBF datasheet specifies a 4.7µH inductor for 5VOUT applications and 10µH for 12VOUT. While not an absolute minimum, 4.7µH is the validated value ensuring stable operation, optimal efficiency, and compliance with peak current limits (5.8A) across the full input range. Using smaller inductors risks exceeding peak current limits under heavy load or low VIN, potentially triggering protection circuits or reducing reliability.
Does the LTC3111MPMSE#TRPBF support synchronization to an external clock?
Yes, the LTC3111MPMSE#TRPBF supports external frequency synchronization via the PWM/SYNC pin. Applying a square-wave signal between 600kHz and 1.5MHz overrides the internal 800kHz oscillator. The signal must maintain ≥100ns minimum high/low time (per Note 6), and the internal PLL locks to the applied frequency-enabling EMI reduction through spread-spectrum alignment or coordination with other switching regulators in dense power systems.
LTC3111MPMSE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck-Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.5V
- Voltage - Input (Max):
- 15V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- 15V
- Current - Output:
- 1.5A
- Frequency - Switching:
- 800kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LTC3111MPMSE#TRPBF FAQ
1.How can I place an order for LTC3111MPMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3111MPMSE#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 LTC3111MPMSE#TRPBF reliable?
The price and inventory of LTC3111MPMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3111MPMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3111MPMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3111MPMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3111MPMSE#TRPBF?
LTC3111MPMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3111MPMSE#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 LTC3111MPMSE#TRPBF?
For technical support, including LTC3111MPMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3111MPMSE#TRPBF requirements.
6.How does Aetrix verify that LTC3111MPMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3111MPMSE#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 LTC3111MPMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3111MPMSE#TRPBF?
All LTC3111MPMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3111MPMSE#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 LTC3111MPMSE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3111MPMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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