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Analog Devices Inc. LTC3111MPMSE#PBF
- Part No.:
- LTC3111MPMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3111MPMSE#PBF.pdf
- Description:
- IC REG BUCK BST ADJ 1.5A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,141
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Product details
Overview
LTC3111MPMSE#PBF from Analog Devices (formerly Linear Technology) is a high-reliability, 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 –55°C to 150°C operating junction temperature. It delivers seamless regulation when VIN is above, below, or equal to VOUT-ideal for wide-input battery-powered RF transmitters and military power systems.
For engineers reviewing the LTC3111MPMSE#PBF datasheet, LTC3111MPMSE#PBF pinout, LTC3111MPMSE#PBF application, or LTC3111MPMSE#PBF equivalent, key selection criteria include its extended temperature grade, 49µA no-load quiescent current in Burst Mode®, accurate RUN-pin UVLO programming, and internal soft-start with thermal shutdown-critical for ruggedized embedded and aerospace designs.
Technical Context
The LTC3111MPMSE#PBF implements a proprietary 4-switch, single-inductor architecture enabling continuous conduction mode transitions between buck, buck-boost, and boost topologies without inductor current discontinuity. 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 paths), dual UVLO circuits (VIN and VCC), programmable RUN threshold (1.15V rising enable), and reverse-current limiting (–1A). Thermal protection 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/multi-cell Li-ion, alkaline/NiMH, backup capacitors, and wall adapters without external level shifting. |
| Continuous Output Current | 1.5A at VIN ≥ 5V, VOUT = 5V in PWM mode - sufficient for powering RF PA stages or FPGA I/O rails. |
| 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 sensor nodes or low-duty-cycle telemetry systems. |
| Shutdown Current | <1µA - ensures minimal leakage during deep sleep in mission-critical hold-up applications. |
| Operating Junction Temp | –55°C to 150°C - qualified for extended-temperature military, downhole, and avionics environments. |
| Feedback Reference | 0.8V ±2.5% - enables precise output programming from 2.5V to 15V using standard resistor dividers. |
Pinout & Package
Package: 16-lead plastic MSOP (3mm × 4.9mm × 1.1mm), exposed pad (Pin 17) connected to PGND. Thermally enhanced for high-power density operation in constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| COMP (Pin 1) | Error amplifier output | Connects to external Type III compensation network (R-C-R-C) to stabilize voltage-mode control loop across full VIN/VOUT range. |
| FB (Pin 2) | Feedback voltage input | Senses output divider; 0.8V reference sets VOUT = 0.8V × (1 + R1/R2); leakage <50nA preserves accuracy under light loads. |
| SNSGND (Pin 3) | Sense ground reference | Provides dedicated low-noise return for FB and RUN dividers-must be isolated from PGND to avoid noise coupling. |
| RUN (Pin 4) | Enable/UVLO programming input | Configurable turn-on threshold (1.15V rising) via resistor divider; 120mV hysteresis prevents chatter near UVLO edge. |
| 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; carries bidirectional current in buck/boost modes; requires tight layout to minimize ringing. |
| BST1 (Pin 7) | Bootstrap supply for SW1 driver | 0.1µF capacitor to SW1 provides gate drive voltage > VIN for N-channel high-side switch A. |
| BST2 (Pin 10) | Bootstrap supply for SW2 driver | 0.1µF capacitor to SW2 supplies gate drive for N-channel switch D in boost path. |
| SW2 (Pin 11) | Low-side switch node C/D | Connects to other inductor end; switches current into/out of VOUT; critical for EMI filtering and layout symmetry. |
| VOUT (Pin 12) | Regulated output | Delivers up to 1.5A; requires local 22µF low-ESR ceramic cap; output disconnect in shutdown prevents backfeed. |
| NC (Pin 13) | No-connect | Internally unused; must be tied to SGND per datasheet to prevent floating noise coupling. |
| VCC (Pin 14) | Internal bias regulator output | Clamped at 4.2V typical; powers internal logic/drivers; accepts 1µF ceramic bypass; can be externally supplied up to 5.5V. |
| PWM/SYNC (Pin 15) | Mode control & frequency sync | <0.5V = Burst Mode®; >1.5V = 800kHz PWM; 600kHz–1.5MHz square wave overrides oscillator with ≥100ns pulse width. |
| SGND (Pin 16) | Signal ground reference | Return for FB/RUN dividers only; separate from PGND to maintain feedback accuracy and noise immunity. |
| PGND (Pin 17, Exposed Pad) | Power ground return | Exposed thermal pad-must be soldered to large copper pour with multiple vias for thermal dissipation and low-impedance return path. |
Key Features
| Feature | Design Value |
|---|---|
| 4-switch synchronous topology | Enables true buck-boost operation with single inductor-reduces BOM count, board area, and magnetic losses vs. cascaded converters. |
| Accurate RUN-pin UVLO programming | Allows custom input undervoltage lockout thresholds (e.g., 2.7V cutoff for Li-ion) with 120mV hysteresis-eliminates need for external supervisor ICs. |
| Output disconnect in shutdown | Prevents backfeeding from VOUT to VIN during system standby-essential for battery-backed systems where load isolation is mandatory. |
| Thermal shutdown with hysteresis | Disables all switches at ~175°C and auto-restarts at ~170°C-protects against sustained overloads without requiring external thermal management circuitry. |
| Inductor damping in Burst Mode® | 1kΩ active damping between SW1/SW2 and GND reduces ringing and conducted EMI during light-load sleep cycles-improves EMC compliance. |
Applications
| RF Transmitter Power Supply | Military Vehicle Power Management |
|---|---|
Use Scenario: Powering 5V/1.2A RF power amplifier stages in SDR radios operating from 3.6V–12V vehicle batteries with strict EMI limits. IC Role / Device Role / Timing Role: Regulates stable 5V rail regardless of battery sag or surge; 800kHz switching avoids sensitive IF bands; Burst Mode® minimizes idle current. Use Value: Eliminates need for pre-regulator + LDO cascade; 95% peak efficiency at 1A reduces thermal load in sealed enclosures. | Use Scenario: Providing 3.3V/1A and 5V/1.5A rails for mission computers and sensors in armored vehicles with –40°C to +85°C ambient but –55°C cold-soak start requirement. IC Role / Device Role / Timing Role: Primary DC/DC converter handling wide input (6V–16V) and extreme temperature cycling; internal soft-start prevents inrush during cold cranking. Use Value: MP-grade qualification ensures startup at –55°C; 150°C max junction temp allows operation in engine-bay proximity without derating. |
| Industrial Backup Capacitor System | Portable Medical Diagnostic Equipment |
Use Scenario: Maintaining 12V/500mA output during AC mains failure using supercapacitor bank (2.5V–10V) as source, with seamless transition. IC Role / Device Role / Timing Role: Bidirectional buck-boost controller that regulates VOUT while sourcing/sinking current from variable-capacitance storage element. Use Value: Single-inductor architecture avoids polarity reversal complexity; reverse-current limit (–1A) prevents capacitor over-discharge during recovery. | Use Scenario: Powering ultrasound front-end ASICs and ADCs from dual-cell Li-ion (6V–8.4V) while delivering clean, low-noise 3.3V/1A and 1.8V/500mA rails. IC Role / Device Role / Timing Role: Primary intermediate regulator generating stable 3.3V; low 49µA Burst Mode® quiescent current extends battery runtime between scans. Use Value: Internal soft-start prevents voltage droop during wake-up; output disconnect isolates patient-connected circuits during standby for safety compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3115EFE#PBF | Same 4-switch architecture, 3.5A output, 2.5V–40V range, but only –40°C to 125°C grade; larger 20-lead TSSOP package. | Higher current and wider VIN support, but lacks MP-grade temperature range and MSOP footprint compatibility. | Select when >1.5A output or >15V input is required; not suitable for –55°C cold-start or space-constrained MSOP layouts. |
| TPS63020DSJR | 2.5V–6V input, 1.2A output, –40°C to 85°C, 10-pin SON; lower IQ (365µA) but no programmable RUN or SYNC. | Consumer-grade thermal spec and narrower voltage range; no external frequency sync or accurate UVLO programming. | Choose for cost-sensitive, non-military portable electronics where extended temperature and precision enable control are unnecessary. |
Compared with LTC3115EFE#PBF and TPS63020DSJR, the LTC3111MPMSE#PBF uniquely combines military-grade temperature range (–55°C to 150°C), MSOP package compatibility, and precise RUN-pin UVLO programming-making it irreplaceable for aerospace, downhole, and high-reliability embedded systems requiring guaranteed cold-start and thermal resilience.
Availability
LTC3111MPMSE#PBF is available at Aetrix Electronics and suitable for RF transmitter power supplies, military vehicle power management, industrial backup capacitor systems, and portable medical diagnostic equipment requiring stable component supply across extended temperature extremes.
Supply support for LTC3111MPMSE#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 maintains its legacy of high-performance analog and power management ICs for demanding applications.
The LTC3111 belongs to Linear's extended-range buck-boost regulator product line, designed specifically for systems where input voltage may fall above, below, or equal to the required output-targeting battery-powered, backup, and multi-rail industrial platforms.
FAQ
What is the maximum continuous output current specification for the LTC3111MPMSE#PBF?
The LTC3111MPMSE#PBF delivers 1.5A continuous output current when VIN ≥ 5V and VOUT = 5V in PWM mode. This rating is validated across its full –55°C to 150°C operating junction temperature range. At higher temperatures or lower input voltages, current capability derates due to thermal limits and reduced MOSFET performance-refer to the "Maximum Output Current vs VIN" curves in the datasheet for precise derating guidance specific to your layout and cooling conditions. The LTC3111MPMSE#PBF maintains this output capability without external current-sense resistors or additional thermal management components.
Does the LTC3111MPMSE#PBF support synchronization to an external clock signal?
Yes, the LTC3111MPMSE#PBF supports external frequency synchronization via its PWM/SYNC pin. Applying a square-wave signal between 600kHz and 1.5MHz overrides the internal 800kHz oscillator and locks the switching frequency to the external source. The signal must have minimum high and low times of at least 100ns to ensure reliable capture and release. This capability enables EMI reduction through frequency dithering or alignment with system clocks-critical in dense mixed-signal designs. The LTC3111MPMSE#PBF does not require additional configuration registers or I²C commands to enable sync mode; it operates automatically upon detection of a valid input waveform.
How is the RUN pin used to program undervoltage lockout thresholds on the LTC3111MPMSE#PBF?
The RUN pin on the LTC3111MPMSE#PBF accepts a resistive divider from VIN to set custom turn-on and turn-off thresholds. With a nominal rising enable threshold of 1.15V and 120mV hysteresis, the formula VIN(RUN) = 1.2V × (1 + R5/R6) determines the input voltage at which the device starts and stops switching. For example, to set a 3.0V turn-on threshold, use R5 = 1.5MΩ and R6 = 1MΩ. The LTC3111MPMSE#PBF's RUN pin also serves as a logic-enable input-driving it high (>1.5V) forces startup, and pulling it low (<0.3V) forces shutdown independent of VIN.
What thermal considerations apply to the LTC3111MPMSE#PBF in high-temperature environments?
The LTC3111MPMSE#PBF is rated for –55°C to 150°C junction temperature and features thermal shutdown activation at ~175°C with automatic restart at ~170°C. To sustain full 1.5A output at elevated ambient temperatures, the exposed PGND pad (Pin 17) must be soldered to a large copper plane with ≥6 thermal vias to an inner ground layer. The datasheet provides die temperature rise curves for 4-layer demo boards-these show ≤40°C rise at 1A with VIN = 5V and VOUT = 5V. In enclosed or high-ambient settings, airflow or heatsinking may be required to keep junction temperature below 150°C. The LTC3111MPMSE#PBF's internal thermal foldback begins before shutdown to preserve reliability.
Can the LTC3111MPMSE#PBF operate with input voltage below its output voltage?
Yes, the LTC3111MPMSE#PBF is explicitly designed for seamless operation when VIN is below, above, or equal to VOUT-enabled by its 4-switch, single-inductor buck-boost architecture. For example, it can regulate a stable 5V output from a 3.3V input (boost mode) or a 12V input (buck mode), transitioning continuously without dropout or mode-switching artifacts. This behavior is confirmed across the full 2.5V–15V input and output range, with no minimum VIN–VOUT differential required. The LTC3111MPMSE#PBF achieves this using internal synchronous N-channel MOSFETs and a voltage-mode control loop referenced to a precise 0.8V internal bandgap.
LTC3111MPMSE#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:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LTC3111MPMSE#PBF FAQ
1.How can I place an order for LTC3111MPMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3111MPMSE#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 LTC3111MPMSE#PBF reliable?
The price and inventory of LTC3111MPMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3111MPMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3111MPMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3111MPMSE#PBF transactions.
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4.How is shipping managed for LTC3111MPMSE#PBF?
LTC3111MPMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3111MPMSE#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 LTC3111MPMSE#PBF?
For technical support, including LTC3111MPMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3111MPMSE#PBF requirements.
6.How does Aetrix verify that LTC3111MPMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3111MPMSE#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 LTC3111MPMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3111MPMSE#PBF?
All LTC3111MPMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3111MPMSE#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 LTC3111MPMSE#PBF part is unused and in its original packaging.
Return procedure for LTC3111MPMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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