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Analog Devices Inc. LTC3111HMSE#TRPBF
- Part No.:
- LTC3111HMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3111HMSE#TRPBF.pdf
- Description:
- IC REG BUCK BST ADJ 1.5A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,989
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Product details
Overview
LTC3111HMSE#TRPBF from Analog Devices (formerly Linear Technology) is a synchronous 4-switch buck-boost DC/DC converter with 2.5V–15V input/output range, 1.5A continuous output current at 5V, 800kHz fixed switching frequency (synchronizable 600kHz–1.5MHz), and selectable Burst Mode® or PWM operation. It delivers up to 95% efficiency in PWM mode and enables regulated power delivery where VIN may be above, below, or equal to VOUT - ideal for multi-cell battery, backup capacitor, and wide-input industrial power systems.
For engineers reviewing the LTC3111HMSE#TRPBF datasheet, LTC3111HMSE#TRPBF pinout, LTC3111HMSE#TRPBF application, or LTC3111HMSE#TRPBF equivalent, key selection criteria include its accurate RUN-pin UVLO threshold (1.15–1.23V enable), 49µA no-load quiescent current in Burst Mode®, output disconnect in shutdown (<1µA shutdown current), and thermally enhanced 16-lead MSOP package rated for –40°C to +150°C junction temperature.
Technical Context
The LTC3111HMSE#TRPBF implements a proprietary 4-switch, single-inductor architecture that enables seamless buck-boost transitions without inductor current discontinuity or output voltage glitching. Its voltage-mode control loop uses an internal 0.8V reference and error amplifier with external Type III compensation on the COMP pin to maintain regulation across wide VIN/VOUT ratios.
It integrates low-RDS(ON) N-channel MOSFETs (90mΩ for SW1 switch A; 105mΩ for switches B/C/D), dual boosted gate drivers (BST1/BST2), and independent current limiting: 2.3–3.7A input current limit, 5.8A peak current limit, and –1A reverse current protection. Thermal shutdown activates at ~175°C, with automatic restart at ~170°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input/Output Range | 2.5V to 15V - supports single/dual/triple Li-ion, alkaline/NiMH, wall adapters, and supercapacitor backup sources without reconfiguration. |
| Continuous Output Current | 1.5A at VIN ≥ 5V, VOUT = 5V in PWM mode - sufficient for powering RF transmitters, FPGA I/O rails, or industrial sensors. |
| Switching Frequency | 800kHz nominal, synchronizable 600kHz–1.5MHz - enables EMI reduction via spread-spectrum sync and compact magnetics design. |
| Quiescent Current | 49µA in Burst Mode® - extends battery life in always-on, low-duty-cycle applications like remote telemetry nodes. |
| Efficiency | Up to 95% at 5VOUT, 1A load - minimizes thermal stress and improves power density in space-constrained enclosures. |
| Operating Temperature | –40°C to +150°C junction - qualified for under-hood automotive, military, and high-reliability industrial environments. |
| Shutdown Current | <1µA - ensures negligible drain during system sleep or emergency cutoff. |
Pinout & Package
The LTC3111HMSE#TRPBF is housed in a thermally enhanced 16-lead plastic MSOP package (3mm × 4.9mm × 1.0mm) with exposed PGND pad (Pin 17) requiring solder connection to PCB ground plane for optimal thermal performance (θJA = 40°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| COMP (Pin 1) | Error amplifier output | Connects to external R-C compensation network to stabilize voltage-mode control loop; determines transient response and phase margin. |
| FB (Pin 2) | Feedback voltage input | Senses resistor divider tap; sets VOUT = 0.8V × (1 + R1/R2) over 2.5V–15V range with ±2.5% accuracy. |
| SNSGND (Pin 3) | Sense ground reference | Provides dedicated low-noise return path for FB and RUN dividers; must be tied to clean signal ground, not PGND. |
| RUN (Pin 4) | Enable/UVLO control input | Enables IC when >1.15V (rising); disables at <1.08V (falling); allows custom input undervoltage lockout via resistive divider. |
| 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 node for switches A/B | Connects external inductor and internal high-side (A) and low-side (B) N-MOSFETs; carries full inductor current in buck/boost modes. |
| BST1 (Pin 7) | Floating gate drive supply for switch A | Requires 0.1µF ceramic capacitor to SW1 to generate boosted voltage for A-switch gate driver. |
| BST2 (Pin 10) | Floating gate drive supply for switch D | Requires 0.1µF ceramic capacitor to SW2 to generate boosted voltage for D-switch gate driver. |
| SW2 (Pin 11) | Inductor node for switches C/D | Connects same external inductor and internal high-side (C) and low-side (D) N-MOSFETs; complements SW1 in 4-switch topology. |
| VOUT (Pin 12) | Regulated output | Delivers stable output; requires local 22µF low-ESR ceramic capacitor with short ground return to minimize ripple and load step overshoot. |
| NC (Pin 13) | No-connect | Internally unconnected; must be tied to GND per layout guidelines to reduce EMI susceptibility. |
| VCC (Pin 14) | Internal bias supply | Regulated ~4.2V output tracking VIN up to clamp; powers internal circuitry and gate drivers; bypass with 1µF ceramic to SGND. |
| PWM/SYNC (Pin 15) | Mode control & frequency sync | <0.5V = Burst Mode®; >1.5V = 800kHz PWM; 600kHz–1.5MHz square wave = synchronized operation with 100ns min pulse width. |
| SGND (Pin 16) | Signal ground | Reference for FB, RUN, COMP, and VCC circuits; separate from PGND to avoid noise coupling into feedback path. |
| PGND (Exposed Pad Pin 17) | Power ground | Primary return for high-current switches and inductor; must be soldered to large copper pour with multiple thermal vias for thermal management. |
Key Features
| Feature | Design Value |
|---|---|
| 4-switch single-inductor architecture | Eliminates need for separate buck and boost stages; enables seamless VIN-to-VOUT transitions without output dropout or mode-switching artifacts. |
| Accurate RUN-pin UVLO with hysteresis | 120mV built-in hysteresis ensures clean power-up/power-down sequencing and prevents oscillation near threshold in noisy environments. |
| Output disconnect in shutdown | Prevents back-powering of upstream sources or loading of downstream circuits when disabled - critical for battery-powered systems with shared rails. |
| Internal soft-start (2ms typical) | Controls inrush current during startup; maintains regulation throughout soft-start and responds to load transients without delay. |
| Thermal shutdown with auto-restart | Protects against sustained overload or poor heatsinking; disables all switches at ~175°C and resumes operation at ~170°C with soft-start reset. |
| Inductor damping in sleep/Burst Mode® | 1kΩ active impedance between SW1/SW2 and GND reduces ringing and conducted EMI when converter is idle or lightly loaded. |
Applications
| RF Transmitter Power Supply | Military Portable Radio System |
|---|---|
Use Scenario: Providing stable 5V rail to GaAs power amplifier in handheld UHF/VHF radios operating from 2–3 Li-ion cells (6–12.6V) with dynamic transmit bursts. IC Role / Device Role / Timing Role: Buck-boost regulator maintaining constant 5V output despite rapid VIN sag during high-current TX pulses. Use Value: Enables uninterrupted RF transmission by sustaining regulation even as battery voltage drops below 5V during discharge, avoiding TX power collapse. | Use Scenario: Powering mission-critical digital baseband and analog front-end in manpack radios exposed to extreme ambient temperatures (–40°C to +70°C). IC Role / Device Role / Timing Role: Primary DC/DC converter delivering 3.3V/1.5A from 24V vehicle bus or 12V backup battery with extended temperature qualification. Use Value: Guaranteed operation to +150°C junction enables reliable function in sealed enclosures without forced air cooling, reducing system size and weight. |
| Industrial Sensor Node | Capacitor-Based Backup Power |
Use Scenario: Powering low-power microcontroller, LoRaWAN transceiver, and analog sensor stack from primary alkaline/NiMH batteries with long shelf life requirements. IC Role / Device Role / Timing Role: Ultra-low-quiescent-current buck-boost regulator enabling years of operation on two AA cells. Use Value: 49µA Burst Mode® IQ extends battery life beyond 10 years in wake-sleep telemetry cycles, minimizing maintenance intervals. | Use Scenario: Maintaining real-time clock and SRAM retention during AC mains failure using supercapacitor bank charged from 5V rail. IC Role / Device Role / Timing Role: Bidirectional buck-boost controller charging capacitor from 5V and discharging to 3.3V during outage. Use Value: Reverse current limit (–1A) prevents capacitor self-discharge through VOUT, preserving backup energy for >72 hours at 3.3V/100µA load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8390AEMSE#TRPBF | Higher 6A output current, 2MHz max frequency, integrated current sense; requires external compensation; larger 20-lead TSSOP package. | Better suited for high-power motor drives or LED lighting; less optimized for ultra-low-IQ battery operation. | Select when >2A output or higher switching frequency is required; avoid if footprint or quiescent current are constraints. |
| TPS63020DSJR | Lower 2.5A output, 2.5MHz fixed frequency, 3.5µA IQ in shutdown; no SYNC pin; smaller 10-pin WSON package. | Targeted at consumer wearables and portable medical devices; lacks programmable RUN UVLO and thermal grade options. | Select for cost-sensitive, space-constrained designs with moderate temperature requirements (–40°C to +85°C only). |
Compared with LT8390AEMSE#TRPBF and TPS63020DSJR, the LTC3111HMSE#TRPBF offers superior thermal robustness (–40°C to +150°C), precise RUN-threshold programming for custom UVLO, and best-in-class 49µA Burst Mode® IQ - making it optimal for high-reliability, battery-backed, or wide-temperature industrial systems where regulation integrity and longevity are critical.
Availability
LTC3111HMSE#TRPBF is available at Aetrix Electronics and suitable for RF transmitter power supplies, military portable radio systems, industrial sensor nodes, and capacitor-based backup power applications requiring stable component supply, extended temperature operation, and low-noise regulation.
Supply support for LTC3111HMSE#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 maintains its legacy of high-performance analog, power management, and precision signal conditioning ICs.
The LTC3111 product line delivers rugged, wide-input-range buck-boost regulators designed for mission-critical power conversion in aerospace, defense, industrial automation, and battery-powered instrumentation where reliability across extreme conditions is non-negotiable.
FAQ
What is the maximum continuous output current capability of the LTC3111HMSE#TRPBF?
The LTC3111HMSE#TRPBF delivers 1.5A continuous output current when VIN ≥ 5V and VOUT = 5V in PWM mode. At lower input voltages (e.g., VIN = 3.3V), output current is limited by the 2.3–3.7A input current limit and thermal constraints. Derating applies above +85°C ambient due to junction temperature limits - consult the die temperature rise curves in the datasheet for board-specific derating.
Does the LTC3111HMSE#TRPBF support synchronization to an external clock?
Yes, the LTC3111HMSE#TRPBF supports external synchronization via the PWM/SYNC pin. Applying a square wave between 600kHz and 1.5MHz overrides the internal 800kHz oscillator. The signal must have minimum high/low times ≥100ns. This feature enables EMI reduction through frequency dithering or alignment with system clocks in multi-rail power architectures.
How does the RUN pin function on the LTC3111HMSE#TRPBF?
The RUN pin on the LTC3111HMSE#TRPBF serves dual functions: logic enable/disable (drive >1.15V to enable, <1.08V to disable) and programmable input UVLO. Using a resistive divider from VIN to RUN sets precise turn-on/turn-off thresholds - e.g., 1.2V × (1 + R5/R6). Hysteresis (~120mV) prevents chatter near threshold. Leaving RUN unconnected disables the device.
What is the purpose of the BST1 and BST2 pins on the LTC3111HMSE#TRPBF?
BST1 and BST2 are floating gate-drive supplies for the high-side N-channel MOSFETs (switches A and D). Each requires a 0.1µF ceramic capacitor connected between the BST pin and its respective switch node (SW1 for BST1, SW2 for BST2) to generate the boosted voltage needed to fully enhance the high-side FETs - essential for achieving low RDS(ON) and high efficiency across the full input range.
Can the LTC3111HMSE#TRPBF operate with input voltage below the output voltage?
Yes, the LTC3111HMSE#TRPBF is explicitly designed for buck-boost operation where VIN may be above, below, or equal to VOUT - supported by its 4-switch architecture and seamless mode transition. For example, it regulates 5V output from a 3.3V input (boost mode) or 12V input (buck mode) without external reconfiguration, making it ideal for variable-source applications like multi-cell batteries.
LTC3111HMSE#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:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LTC3111HMSE#TRPBF FAQ
1.How can I place an order for LTC3111HMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3111HMSE#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 LTC3111HMSE#TRPBF reliable?
The price and inventory of LTC3111HMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3111HMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3111HMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3111HMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3111HMSE#TRPBF?
LTC3111HMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3111HMSE#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 LTC3111HMSE#TRPBF?
For technical support, including LTC3111HMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3111HMSE#TRPBF requirements.
6.How does Aetrix verify that LTC3111HMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3111HMSE#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 LTC3111HMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3111HMSE#TRPBF?
All LTC3111HMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3111HMSE#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 LTC3111HMSE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3111HMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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