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Analog Devices Inc. LTC3111IMSE#PBF
- Part No.:
- LTC3111IMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3111IMSE#PBF.pdf
- Description:
- IC REG BUCK BST ADJ 1.5A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:151
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Product details
Overview
LTC3111IMSE#PBF from Analog Devices (formerly Linear Technology) is a synchronous 4-switch buck-boost DC/DC converter with single-inductor architecture, supporting continuous 1.5A output current at 5V when VIN ≥ 5V in PWM mode. It operates across 2.5V–15V input and output ranges, delivers up to 95% efficiency, and features 800kHz fixed-frequency or 600kHz–1.5MHz synchronizable switching - ideal for battery-powered RF transmitters and industrial backup power systems.
For engineers reviewing the LTC3111IMSE#PBF datasheet, LTC3111IMSE#PBF pinout, LTC3111IMSE#PBF application, or LTC3111IMSE#PBF equivalent, key selection criteria include its seamless VIN-above/below/equal-VOUT regulation, accurate RUN-pin UVLO programming (1.15V enable threshold), 49µA no-load quiescent current in Burst Mode®, and thermal shutdown with automatic restart at ~170°C junction temperature.
Technical Context
The LTC3111IMSE#PBF implements a proprietary voltage-mode control algorithm with internal error amplifier, analog divider for gain stabilization across buck/boost modes, and dual current limiting: 3A typical input current limit with active loop recovery and 5.8A peak switch-A limit for hard short protection. Its 4-switch topology enables continuous conduction mode operation without polarity reversal or discontinuous transitions during mode crossing.
It integrates low-RDS(ON) N-channel MOSFETs (90mΩ for SW1, 105mΩ for SW2/BST paths), supports external VCC sourcing up to 5.5V, and provides output disconnect in shutdown (<1µA shutdown current). The device uses a Type III compensation network on COMP/FB and includes built-in soft-start (2ms nominal) and inductor damping during sleep.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 15V - supports single/multi-cell Li-ion, alkaline/NiMH, supercapacitor, and wall adapter sources without external pre-regulation. |
| Output Voltage Range | 2.5V to 15V - programmable via FB resistor divider; maintains regulation even when VIN crosses VOUT. |
| Max Continuous Output Current | 1.5A at 5VOUT with VIN ≥ 5V in PWM mode - sufficient for powering RF PA stages or microcontroller subsystems. |
| Switching Frequency | 800kHz nominal, synchronizable 600kHz–1.5MHz - enables EMI optimization and avoids sensitive frequency bands. |
| Quiescent Current (Burst Mode) | 49µA typical - extends battery life in always-on sensor nodes or low-duty-cycle telemetry devices. |
| Efficiency Peak | Up to 95% - achieved at mid-load in PWM mode, reducing thermal load in enclosed industrial enclosures. |
| Shutdown Current | <1µA - enables true zero-power standby in safety-critical or energy-harvesting applications. |
| Operating Junction Temp | –40°C to +125°C - qualified for industrial temperature grade (I-grade), suitable for uncontrolled ambient environments. |
Pinout & Package
Package: 16-lead plastic MSOP (3mm × 4.9mm × 1.1mm), thermally enhanced with exposed PGND pad (Pin 17) requiring PCB soldering for thermal and electrical integrity. θJA = 40°C/W, θJC = 10°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 control loop across full VIN/VOUT range. |
| FB (Pin 2) | Feedback reference input | Senses output via resistor divider; 0.8V internal reference enables 2.5V–15V VOUT programming with <±1% accuracy. |
| SNSGND (Pin 3) | Sense ground reference | Provides dedicated low-noise ground return for FB and RUN dividers - must be isolated from power ground noise. |
| RUN (Pin 4) | Enable/UVLO control input | Programmable turn-on threshold (1.15V rising) allows custom input undervoltage lockout; hysteresis prevents chatter. |
| 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) | High-side switch node A/B | Connects to one end of external inductor; drives internal N-MOSFETs A and B in buck/buck-boost configurations. |
| BST1 (Pin 7) | Bootstrap supply for SW1 driver | 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 SW2 driver | Requires 0.1µF ceramic capacitor to SW2 to generate gate drive voltage >VOUT for high-side N-MOSFET D. |
| SW2 (Pin 11) | Low-side switch node C/D | Connects to other end of external inductor; drives internal N-MOSFETs C and D in boost/buck-boost configurations. |
| VOUT (Pin 12) | Regulated output | Delivers stable output; requires local 22µF low-ESR ceramic capacitor with short ground return path. |
| NC (Pin 13) | No-connect | Must be tied to SGND per datasheet - not left floating to avoid noise coupling or latch-up risk. |
| VCC (Pin 14) | Internal regulator supply | Internally regulated to ~4.2V; can be powered externally up to 5.5V to improve light-load efficiency or reduce self-heating. |
| PWM/SYNC (Pin 15) | Mode control & sync input | DC <0.5V = Burst Mode; >1.5V = PWM; 600kHz–1.5MHz square wave = synchronized operation with 100ns min pulse width. |
| SGND (Pin 16) | Signal ground reference | Return path for FB, RUN, and COMP networks - must be star-connected to minimize ground bounce in feedback loop. |
| PGND (Exposed Pad) | Power ground | Primary thermal and current return path; must be soldered to large copper plane with multiple vias for θJA compliance. |
Key Features
| Feature | Design Value |
|---|---|
| Seamless buck-boost transition | Proprietary 4-switch algorithm maintains continuous inductor current during VIN/VOUT crossover - eliminates output glitches in real-time systems. |
| Accurate programmable UVLO | RUN pin enables precise input voltage turn-on/off thresholds (1.15V enable, 1.08V disable) with 120mV hysteresis - critical for battery end-of-life detection. |
| Inductor damping in sleep | Active 1kΩ path between SW1/SW2 and GND during Burst Mode® or shutdown suppresses ringing and EMI - reduces need for snubbers. |
| Output disconnect in shutdown | Internal switches isolate VOUT from VIN during shutdown - prevents backfeed into source, essential for multi-rail battery systems. |
| Thermal foldback protection | Linear reduction of input current limit above ~170°C junction, followed by full shutdown at ~175°C and auto-restart at ~170°C - prevents thermal runaway. |
| Reverse current limiting | 1A reverse current limit on SW2 (D-switch) blocks excessive backflow when VOUT > VIN - protects against unintended power injection. |
Applications
| RF Transmitter Power Supply | Military Backup Power System |
|---|---|
Use Scenario: Providing stable 5V/1.5A to GaN or LDMOS RF power amplifiers in portable tactical radios operating from 2S–3S Li-ion batteries (6–12.6V). IC Role / Device Role / Timing Role: Buck-boost regulator maintaining constant VOUT as battery discharges below 5V and surges above during charging pulses. Use Value: Eliminates need for separate buck and boost converters; 95% efficiency minimizes heat near sensitive RF front-end components. |
Use Scenario: Maintaining 3.3V or 5V rail during main power failure using supercapacitor bank (2.5–15V) in ruggedized vehicle electronics. IC Role / Device Role / Timing Role: Seamless switchover regulator that sustains output without interruption as input decays from 12V to 2.5V. Use Value: No brownout or reset events during transition; 49µA Burst Mode quiescent current maximizes hold-up time. |
| Industrial Sensor Node | Multi-Cell Alkaline/NiMH System |
Use Scenario: Powering ultra-low-power MCU, LoRaWAN transceiver, and analog sensors from two or three alkaline cells (1.8–4.8V) with long shelf life. IC Role / Device Role / Timing Role: High-efficiency step-up/down regulator enabling consistent 3.3V operation across full battery discharge curve. Use Value: 1µA shutdown current preserves battery capacity during years of storage; integrated soft-start prevents inrush damage to capacitive loads. |
Use Scenario: Regulating 5V for embedded display and interface logic from 4–12V input derived from 3–10 alkaline or NiMH cells in handheld test equipment. IC Role / Device Role / Timing Role: Wide-input-range buck-boost converter eliminating need for input voltage binning or multiple SKUs. Use Value: Single BOM item supports diverse battery configurations; 800kHz switching allows compact 4.7µH inductor size. |
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#PBF | Higher 6A output capability, 2MHz max frequency, but larger 20-lead TSSOP package and higher 2.5mA quiescent current. | Better suited for high-current motor drivers or LED lighting; less optimal for space-constrained, ultra-low-IQ battery systems. | Select LT8390EMSE#PBF only when >2A output or >1MHz switching is required; LTC3111IMSE#PBF remains superior for sub-2A, low-IQ designs. |
| TPS63020DSJR | Lower 2A max output, 2.5MHz fixed frequency, 3.5µA IQ, but limited 1.8–5.5V input range and no programmable RUN UVLO. | Ideal for USB-powered portable devices with tight input constraints; lacks wide-input flexibility for battery chemistries beyond Li-ion. | Choose TPS63020DSJR for cost-sensitive, USB-native applications with narrow VIN; LTC3111IMSE#PBF is preferred for industrial battery diversity and precision UVLO. |
Compared with LT8390EMSE#PBF and TPS63020DSJR, the LTC3111IMSE#PBF uniquely balances 1.5A output, 2.5V–15V input flexibility, 49µA Burst Mode IQ, and accurate programmable UVLO - making it the optimal choice for ruggedized, multi-chemistry battery systems requiring reliability over raw power density.
Availability
LTC3111IMSE#PBF is available at Aetrix Electronics and suitable for RF transmitter power supplies, military backup power systems, and industrial sensor nodes requiring stable component supply with guaranteed industrial temperature grading (–40°C to +125°C).
Supply support for LTC3111IMSE#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 acquired Linear Technology in 2017 and continues its legacy of high-performance power management ICs with rigorous automotive and industrial qualification standards.
The LTC3111IMSE#PBF belongs to Linear's extended-range buck-boost converter family, designed specifically for applications where input voltage may fall below, rise above, or equal the regulated output - such as battery-powered communications, backup power, and multi-cell energy harvesting systems.
FAQ
What is the maximum output current capability of the LTC3111IMSE#PBF?
The LTC3111IMSE#PBF delivers up to 1.5A continuous output current at 5VOUT when VIN ≥ 5V and operating in PWM mode. This rating assumes proper thermal design with the exposed PGND pad soldered to a sufficient copper area. At lower input voltages (e.g., 3.3V VIN), output current is limited by the 3A input current limit and efficiency derating - consult the "Maximum Output Current vs VIN" graph in the datasheet for exact derating curves.
Can the LTC3111IMSE#PBF operate with input voltage below the output voltage?
Yes, the LTC3111IMSE#PBF is explicitly designed for seamless operation when VIN is below, above, or equal to VOUT. Its 4-switch synchronous buck-boost architecture ensures continuous conduction mode and uninterrupted regulation across the full 2.5V–15V input and output range - no external configuration or mode switching is required.
How does the RUN pin function on the LTC3111IMSE#PBF?
The RUN pin on the LTC3111IMSE#PBF serves dual purposes: it enables/disables the IC and programs custom input UVLO thresholds. With a resistive divider from VIN to RUN, the turn-on threshold is set to 1.15V (rising), and turn-off occurs at ~1.08V (falling) due to 120mV hysteresis. This enables precise battery end-of-discharge detection without external comparators.
What is the purpose of the BST1 and BST2 pins on the LTC3111IMSE#PBF?
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, respectively.
Does the LTC3111IMSE#PBF support synchronization to an external clock?
Yes, the LTC3111IMSE#PBF 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 of 100ns, and duty cycle is not critical - enabling EMI reduction by aligning switching edges with system clocks or avoiding sensitive frequency bands.
Is output disconnect implemented in shutdown mode for the LTC3111IMSE#PBF?
Yes, the LTC3111IMSE#PBF provides true output disconnect during shutdown: all internal power switches open, isolating VOUT from VIN. This prevents backfeeding into the input source - a critical feature in multi-rail battery systems or when powering downstream circuits that must remain de-energized during standby.
LTC3111IMSE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC3111IMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3111IMSE#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 LTC3111IMSE#PBF reliable?
The price and inventory of LTC3111IMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3111IMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3111IMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3111IMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3111IMSE#PBF?
LTC3111IMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3111IMSE#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 LTC3111IMSE#PBF?
For technical support, including LTC3111IMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3111IMSE#PBF requirements.
6.How does Aetrix verify that LTC3111IMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3111IMSE#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 LTC3111IMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3111IMSE#PBF?
All LTC3111IMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3111IMSE#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 LTC3111IMSE#PBF part is unused and in its original packaging.
Return procedure for LTC3111IMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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