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Analog Devices Inc. LTC3111IMSE#TRPBF
- Part No.:
- LTC3111IMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3111IMSE#TRPBF.pdf
- Description:
- IC REG BUCK BST ADJ 1.5A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,670
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Product details
Overview
LTC3111IMSE#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-frequency PWM operation, and selectable Burst Mode® for ultra-low quiescent current. It enables regulated power delivery where VIN may be above, below, or equal to VOUT-ideal for multi-cell battery systems and backup capacitor supplies.
For engineers reviewing the LTC3111IMSE#TRPBF datasheet, LTC3111IMSE#TRPBF pinout, LTC3111IMSE#TRPBF application, or LTC3111IMSE#TRPBF equivalent, key selection criteria include its seamless buck-boost transition, accurate RUN-pin UVLO programming, 49µA no-load quiescent current in Burst Mode®, internal soft-start, and thermal shutdown protection in the 16-lead MSOP package.
Technical Context
The LTC3111IMSE#TRPBF implements a proprietary 4-switch, single-inductor architecture that maintains continuous inductor current during mode transitions between buck, buck-boost, and boost-eliminating output voltage discontinuity and reducing EMI. Its voltage-mode control loop uses an internal 0.8V reference and error amplifier with external Type III compensation on the COMP pin.
It integrates low-RDS(ON) N-channel MOSFETs (90mΩ for SW1, 105mΩ for SW2/BST switches), supports frequency synchronization from 600kHz to 1.5MHz via PWM/SYNC, and features dual UVLO thresholds (VIN and VCC), reverse current limiting (–1A), and programmable input current limit (2.3A typ).
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 without external level-shifting. |
| Continuous Output Current | 1.5A at VIN ≥ 5V, VOUT = 5V in PWM mode - sufficient for RF transmitters, industrial sensors, and portable instrumentation loads. |
| Switching Frequency | 800kHz nominal, synchronizable 600kHz–1.5MHz - enables compact magnetics and noise filtering while avoiding AM radio band. |
| Quiescent Current | 49µA in Burst Mode® - extends battery life in always-on IoT nodes and low-power telemetry devices. |
| Efficiency | Up to 95% - achieved via low-RDS(ON) internal FETs and optimized gate drive, critical for thermally constrained enclosures. |
| Shutdown Current | <1µA - ensures minimal drain during system sleep, preserving backup energy in mission-critical hold-up applications. |
| Feedback Reference | 0.80V ±2.5% - enables precise output regulation across temperature and line/load variations using standard resistor dividers. |
Pinout & Package
Package: 16-lead plastic MSOP (3mm × 4.9mm × 1.0mm), exposed thermal pad (Pin 17) connected to PGND. Designed for high-power density and thermal performance in space-constrained industrial and military PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| COMP (Pin 1) | Error amplifier output | Connects external R-C compensation network to stabilize control loop; determines transient response and phase margin. |
| FB (Pin 2) | Feedback voltage input | Senses output divider; regulates VOUT via 0.8V reference - sets output from 2.5V to 15V with ±2.5% accuracy. |
| SNSGND (Pin 3) | Sense ground reference | Provides dedicated low-noise ground return for FB and RUN dividers - isolates signal paths from power ground noise. |
| RUN (Pin 4) | Enable/UVLO control input | Programmable turn-on threshold (1.18V typ); enables custom input undervoltage lockout with 120mV hysteresis. |
| VIN (Pin 5) | Main input supply | Accepts 2.5V–15V; requires local 10µF low-ESR ceramic bypass - powers internal circuitry and switch drivers via VCC clamp. |
| SW1 (Pin 6) | High-side switch node A/B | Connects to inductor and internal N-MOSFETs A/B - carries full inductor current in buck/buck-boost modes. |
| BST1 (Pin 7) | Bootstrap supply for SW1 driver | Requires 0.1µF capacitor to SW1 - generates gate drive voltage >VIN for high-side N-FET A. |
| BST2 (Pin 10) | Bootstrap supply for SW2 driver | Requires 0.1µF capacitor to SW2 - generates gate drive voltage >VOUT for high-side N-FET D in boost mode. |
| SW2 (Pin 11) | Low-side switch node C/D | Connects to inductor and internal N-MOSFETs C/D - carries full inductor current in boost/buck-boost modes. |
| VOUT (Pin 12) | Regulated output | Delivers stable output; requires local 22µF low-ESR ceramic capacitor - supports load steps up to 0.5A with <200mV overshoot. |
| NC (Pin 13) | No-connect | Must be tied to SGND - prevents floating node coupling and EMI susceptibility. |
| VCC (Pin 14) | Internal regulator supply | Clamped at 4.2V typical; powers analog/digital blocks - can be externally supplied up to 5.5V for improved efficiency at high VIN. |
| PWM/SYNC (Pin 15) | Mode control & sync input | 0.5V = Burst Mode®, >1.5V = PWM; accepts 600kHz–1.5MHz sync clock - enables EMI reduction and multi-rail synchronization. |
| SGND (Pin 16) | Signal ground | Reference for FB/RUN dividers - must be star-connected to SNSGND and isolated from PGND to minimize noise injection. |
| PGND (Pin 8, 9, Exposed Pad 17) | Power ground | Primary return path for all switching currents - exposed pad must be soldered with ≥4 thermal vias to inner ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Seamless buck-boost transition | Maintains continuous inductor current across VIN/VOUT crossover - eliminates output glitches during battery discharge or input transients. |
| Programmable RUN-pin UVLO | Enables precise input voltage turn-on/off thresholds (e.g., 2.7V–3.6V for Li-ion cutoff) without external comparators or hysteresis resistors. |
| Reverse current limiting | Blocks –1A reverse current into VOUT - protects against back-driving from higher-voltage rails or hot-swap events. |
| Inductor damping in shutdown | Activates 1kΩ path between SW1/SW2 and GND when disabled - suppresses ringing and radiated EMI during standby or Burst Mode sleep. |
| Thermal shutdown with auto-restart | Disables all switches at ~175°C junction; restarts at ~170°C - prevents permanent damage while enabling autonomous recovery after cooling. |
Applications
| Portable Medical Sensors | RF Power Amplifier Supply |
|---|---|
Use Scenario: Wearable ECG monitor powered by single Li-ion cell (2.8V–4.2V) requiring stable 3.3V rail for ADC and BLE radio. IC Role / Device Role / Timing Role: Buck-boost regulator maintaining 3.3V output as battery discharges below and above 3.3V - ensures uninterrupted data acquisition and wireless transmission. Use Value: Eliminates need for separate buck and boost stages; 95% peak efficiency extends runtime; 49µA Burst Mode current preserves battery during idle periods. | Use Scenario: 5G small-cell remote radio head with variable input (12V–15V) powering 5V RF PA stage under dynamic load modulation. IC Role / Device Role / Timing Role: Wide-input buck-boost delivering regulated 5V with fast load-step response (<500µs settling) and low output ripple (<200mVpp) in PWM mode. Use Value: Supports input voltage sag during PA burst transmission; 800kHz switching avoids interference with cellular bands; thermal shutdown prevents PA damage during overload. |
| Industrial Backup Power System | Military Portable Radios |
Use Scenario: Programmable logic controller with supercapacitor backup (0.8V–5.5V) supplying 5V to microcontroller during AC mains failure. IC Role / Device Role / Timing Role: Bidirectional buck-boost managing energy flow from capacitor to 5V rail - operates efficiently across full capacitor discharge curve. Use Value: 2.5V–15V range accommodates wide capacitor voltage swing; <1µA shutdown current minimizes self-discharge; output disconnect prevents capacitor leakage. | Use Scenario: Manpack radio using triple Alkaline cells (3.0V–4.8V) powering 3.3V digital baseband and 5V RF front-end simultaneously. IC Role / Device Role / Timing Role: Single-inductor dual-output solution (via external LDOs) delivering stable rails despite varying cell impedance and temperature. Use Value: Reduces BOM count vs. discrete buck+boost; 16-lead MSOP meets MIL-STD-810H vibration requirements; –40°C to 125°C rating ensures field reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8390EMSE#TRPBF | Higher 6A output, 2MHz max frequency, requires external compensation; no Burst Mode® - 22µA quiescent current in low-power mode. | Targets high-current automotive infotainment; less suitable for ultra-low-power battery systems due to higher IQ. | Select when >2A output or 2MHz switching is required; avoid if sub-100µA no-load current is mandatory. |
| TPS63020DSJR | 3.5A output, 2.5V–5.5V input, integrated compensation; 30µA quiescent current - lacks programmable UVLO and SYNC capability. | Optimized for consumer wearables with tight size constraints; no support for >5.5V inputs or external frequency sync. | Choose for cost-sensitive, low-voltage (≤5.5V) designs where board space is critical and advanced control features are unnecessary. |
Compared with LT8390EMSE#TRPBF and TPS63020DSJR, the LTC3111IMSE#TRPBF offers superior UVLO programmability, true 2.5V–15V operation, and lower 49µA Burst Mode current - making it optimal for wide-input industrial and military systems where precision enable control and extended battery life are essential.
Availability
LTC3111IMSE#TRPBF is available at Aetrix Electronics and suitable for portable medical sensors, RF power amplifier supplies, industrial backup power systems, and military portable radios requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3111IMSE#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 ICs for precision power, signal conditioning, and timing applications.
The LTC3111IMSE#TRPBF belongs to Linear's buck-boost regulator product line, engineered for applications demanding seamless voltage crossover, wide input/output flexibility, and robust protection in harsh environments.
FAQ
What is the maximum continuous output current of the LTC3111IMSE#TRPBF?
The LTC3111IMSE#TRPBF delivers 1.5A continuous output current when VIN ≥ 5V and VOUT = 5V in PWM mode. At lower input voltages (e.g., VIN = 2.7V), output current is reduced due to input current limiting (2.3A typ) and thermal constraints. Derating curves in the datasheet show 1.2A at 2.7V input and 5V output on a 4-layer demo board.
Can the LTC3111IMSE#TRPBF operate with input voltage below the output voltage?
Yes, the LTC3111IMSE#TRPBF is specifically designed for buck-boost operation and functions seamlessly when VIN is below, above, or equal to VOUT - from 2.5V to 15V for both input and output. Its 4-switch architecture ensures continuous conduction mode and stable regulation across the entire crossover region without mode-switching artifacts.
How does the RUN pin function on the LTC3111IMSE#TRPBF?
The RUN pin on the LTC3111IMSE#TRPBF serves dual purposes: it enables/disables the IC and programs custom input UVLO thresholds. When driven above 1.18V (typ), the device turns on; hysteresis of 120mV ensures clean turn-off at ~1.08V. A resistive divider from VIN to RUN allows precise setting of turn-on voltage - e.g., 3.0V for Li-ion cutoff - without external components.
What is the purpose of the BST1 and BST2 pins on the LTC3111IMSE#TRPBF?
BST1 and BST2 are bootstrap supply pins for the high-side N-channel MOSFET drivers. BST1 requires a 0.1µF capacitor to SW1 to generate gate voltage >VIN for switch A; BST2 requires a 0.1µF capacitor to SW2 to generate gate voltage >VOUT for switch D. These ensure full enhancement of high-side FETs in buck and boost phases, minimizing conduction losses.
Does the LTC3111IMSE#TRPBF support external frequency synchronization?
Yes, the LTC3111IMSE#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 and synchronization of multiple converters in dense power systems.
LTC3111IMSE#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LTC3111IMSE#TRPBF FAQ
1.How can I place an order for LTC3111IMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3111IMSE#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 LTC3111IMSE#TRPBF reliable?
The price and inventory of LTC3111IMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3111IMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3111IMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3111IMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3111IMSE#TRPBF?
LTC3111IMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3111IMSE#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 LTC3111IMSE#TRPBF?
For technical support, including LTC3111IMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3111IMSE#TRPBF requirements.
6.How does Aetrix verify that LTC3111IMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3111IMSE#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 LTC3111IMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3111IMSE#TRPBF?
All LTC3111IMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3111IMSE#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 LTC3111IMSE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3111IMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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