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Analog Devices Inc. LTC3111HMSE#PBF
- Part No.:
- LTC3111HMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3111HMSE#PBF.pdf
- Description:
- IC REG BUCK BST ADJ 1.5A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,996
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Product details
Overview
LTC3111HMSE#PBF 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 (synchronizable 600kHz–1.5MHz), and 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 LTC3111HMSE#PBF datasheet, LTC3111HMSE#PBF pinout, LTC3111HMSE#PBF application, or LTC3111HMSE#PBF equivalent, key selection criteria include its extended voltage range, accurate RUN-pin UVLO programming, 49µA no-load quiescent current in Burst Mode®, thermal shutdown with auto-restart, and compatibility with standard 16-lead MSOP layout and thermal pad grounding.
Technical Context
The LTC3111HMSE#PBF implements a proprietary 4-switch, single-inductor architecture that enables seamless mode transitions (buck → buck-boost → boost) without inductor current discontinuity or output voltage glitch. Its voltage-mode control loop uses an internal 0.8V reference and error amplifier with COMP pin for Type III compensation.
It integrates low-RDS(ON) N-channel MOSFETs (90mΩ for SW1, 105mΩ for SW2/SW3/SW4), programmable input current limit (2.3A typ), peak current limit (5.8A), reverse current limit (–1A), and dual UVLO thresholds for VIN (1.9V–2.3V) and VCC (2.2V–2.5V).
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 EMI-sensitive designs and allows frequency coordination with other system clocks. |
| 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 mid-load - achieved via low-RDS(ON) internal FETs and optimized gate drive, reducing thermal stress in compact enclosures. |
| Shutdown Current | <1µA - ensures negligible battery drain during system sleep or storage, critical for long-life sealed devices. |
| Operating Junction Temp | –40°C to +150°C - qualified for harsh environments including automotive under-hood, military avionics, and industrial motor controls. |
Pinout & Package
Package: 16-lead plastic MSOP (3mm × 4.9mm × 1.1mm) with exposed thermal pad (Pin 17 = PGND). Requires soldering of exposed pad to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| COMP (Pin 1) | Error amplifier output | Connects to external R-C compensation network; determines loop stability and transient response of regulation loop. |
| FB (Pin 2) | Feedback voltage input | Senses output divider; sets VOUT = 0.8V × (1 + R1/R2); accuracy ±2.5% over temperature ensures stable setpoint. |
| SNSGND (Pin 3) | Sense ground reference | Provides dedicated low-noise ground return for FB and RUN dividers; must be routed separately from PGND to avoid noise coupling. |
| RUN (Pin 4) | Enable/UVLO programming input | Configurable turn-on threshold (1.15V–1.23V rising); enables precise input brown-out protection and system-level power sequencing. |
| 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 full switching current; requires tight layout to minimize EMI and voltage spikes. |
| BST1 (Pin 7) | Bootstrap supply for SW1 driver | Requires 0.1µF ceramic cap to SW1; enables high-side N-FET gate drive above VIN, critical for buck operation efficiency. |
| BST2 (Pin 10) | Bootstrap supply for SW2 driver | Requires 0.1µF ceramic cap to SW2; provides floating gate drive for D-switch in boost path, enabling bidirectional regulation. |
| SW2 (Pin 11) | Low-side switch node C/D | Connects to other end of external inductor; switches in complementary phase to SW1; shares same inductor for compact design. |
| VOUT (Pin 12) | Regulated output | Delivers up to 1.5A; requires local 22µF low-ESR ceramic output cap; output disconnect in shutdown prevents backfeed. |
| NC (Pin 13) | No-connect | Internally unused; must be connected to SGND per datasheet to prevent floating node noise coupling. |
| VCC (Pin 14) | Internal regulator supply | Self-generated ~4.2V rail; powers internal logic and gate drivers; can be externally supplied up to 5.5V for improved efficiency. |
| PWM/SYNC (Pin 15) | Mode control & sync input | 0.5V = Burst Mode®, >1.5V = PWM; 600kHz–1.5MHz square wave overrides oscillator - enables deterministic timing in synchronized systems. |
| SGND (Pin 16) | Signal ground reference | Return for FB, RUN, and COMP networks; isolated from PGND to maintain feedback accuracy in noisy power environments. |
| PGND (Pin 8, 9, Exposed Pad 17) | Power ground | Main return for high-current paths (SW1/SW2/FETs); exposed pad must be soldered to large copper pour with multiple vias for thermal dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| 4-switch single-inductor topology | Enables seamless buck/boost/buck-boost transitions without output voltage dip or inductor current reversal - eliminates need for separate buck and boost stages. |
| Accurate programmable RUN-pin UVLO | Turn-on threshold adjustable from 1.15V to 1.23V with 120mV hysteresis - supports custom battery cutoff and system wake-up sequencing. |
| Output disconnect in shutdown | Prevents backfeeding from VOUT to VIN when disabled - essential for battery-powered systems with shared rails or hot-swap requirements. |
| Inductor damping in Burst Mode® | 1kΩ active impedance between SW1/SW2 and GND during sleep - suppresses ringing and radiated EMI without external snubbers. |
| Thermal shutdown with auto-restart | Disables all switches at ~175°C; restarts at ~170°C - protects against sustained overload while enabling recovery without manual reset. |
Applications
| Portable Medical Sensors | RF Power Amplifier Bias |
|---|---|
|
Use Scenario: Wearable ECG patch powered by single Li-ion cell (2.7V–4.2V) requiring stable 3.3V for analog front-end and digital controller. IC Role / Device Role / Timing Role: Buck-boost regulator maintaining 3.3V output across full battery discharge curve, including deep discharge (<3.0V) where VIN < VOUT. Use Value: Eliminates need for battery gauge or pre-regulator; 95% peak efficiency at 100mA extends runtime; 49µA Burst Mode® current preserves charge during sleep intervals. |
Use Scenario: LTE transmitter module using 3.3V logic but requiring 5V bias for PA stage, powered from variable 2.5V–12V source (e.g., vehicle battery or PoE). IC Role / Device Role / Timing Role: Voltage-regulated power source delivering clean 5V at up to 1.5A with fast load transient response to PA burst transmission. Use Value: Seamless mode transition avoids PA dropout during voltage sag; 800kHz switching enables small 4.7µH inductor; SYNC input aligns switching with baseband clock to reduce beat frequencies. |
| Military Data Loggers | Industrial Backup Power |
|
Use Scenario: Ruggedized field recorder operating from 3×AA alkaline (3.0V–4.5V) or 2×LiFePO₄ (4.8V–6.4V), needing 5V for microcontroller and 12V for SD card interface. IC Role / Device Role / Timing Role: Primary DC/DC stage generating 5V; second LTC3111 variant configured for 12V output - both share same footprint and control logic. Use Value: –40°C to +150°C H-grade rating ensures operation in extreme ambient; 150°C junction limit with thermal foldback maintains reliability during prolonged high-temp exposure. |
Use Scenario: PLC I/O module with supercapacitor backup (0.5V–5.5V) supplying 3.3V to retain configuration memory during AC mains failure. IC Role / Device Role / Timing Role: Bidirectional buck-boost converter harvesting energy from decaying capacitor to sustain regulated 3.3V until safe shutdown. Use Value: Operates down to 2.5V input - maximizes usable capacitor energy; output disconnect prevents capacitor self-discharge through load; <1µA shutdown current extends hold-up time. |
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 60V input, 4A output, spread-spectrum EMI reduction; larger 16-lead MSOP-EP package; requires external compensation. | Better suited for 24V/48V industrial bus inputs and higher-power loads; less optimal for space-constrained battery devices due to size and complexity. | Select LT8390EMSE#PBF when input exceeds 15V or output current >1.5A is required; verify layout compatibility with larger thermal pad and additional compensation components. |
| TPS63020DSJR | Lower 0.3V–5.5V input, 2A output, integrated compensation; smaller 10-pin SON package; no SYNC or programmable RUN pin. | Ideal for ultra-compact consumer electronics with single-cell Li-ion; lacks precision UVLO and frequency synchronization needed for industrial timing-critical systems. | Choose TPS63020DSJR for cost-sensitive, space-limited consumer designs where 2.5V–15V range and 1.5A+ capability are unnecessary. |
Compared with LT8390EMSE#PBF and TPS63020DSJR, the LTC3111HMSE#PBF uniquely balances wide 2.5V–15V operation, precise RUN-pin UVLO programming, 800kHz synchronization, and H-grade temperature rating - making it optimal for ruggedized battery-backed and RF-critical applications where parameter control and environmental resilience are prioritized over raw current or integration density.
Availability
LTC3111HMSE#PBF is available at Aetrix Electronics and suitable for portable medical sensors, RF power amplifiers, military data loggers, and industrial backup power systems requiring stable component supply across extended temperature and voltage ranges.
Supply support for LTC3111HMSE#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 analog and power management ICs for demanding applications.
The LTC3111HMSE#PBF belongs to Linear's high-efficiency buck-boost regulator product line, designed specifically for systems where input voltage varies widely relative to output - such as battery-powered, capacitor-backed, and multi-rail industrial equipment.
FAQ
What is the maximum continuous output current of the LTC3111HMSE#PBF?
The LTC3111HMSE#PBF 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 and thermal constraints. The datasheet specifies 1.5A as the guaranteed minimum under those conditions, with derating required above 85°C ambient or with inadequate PCB copper area.
Does the LTC3111HMSE#PBF support synchronization to an external clock?
Yes, the LTC3111HMSE#PBF supports external synchronization via its PWM/SYNC pin. Applying a square-wave signal between 600kHz and 1.5MHz overrides the internal 800kHz oscillator. The signal must have minimum high/low times ≥100ns, and the LTC3111HMSE#PBF will lock to the applied frequency with phase alignment, enabling EMI reduction and deterministic timing in multi-converter systems.
How does the RUN pin function on the LTC3111HMSE#PBF?
The RUN pin on the LTC3111HMSE#PBF serves dual functions: digital enable/disable (logic-high >1.5V enables, <0.3V disables) and programmable input UVLO. Using a resistive divider from VIN to RUN sets precise turn-on (1.15V–1.23V rising) and turn-off (1.03V–1.11V falling) thresholds with 120mV hysteresis. This allows custom battery cutoff and system-level power sequencing without external comparators.
What is the thermal performance difference between the MSOP and DFN packages of the LTC3111HMSE#PBF?
The LTC3111HMSE#PBF uses the 16-lead MSOP package with θJA = 40°C/W and θJC = 10°C/W. Compared to the 14-lead DFN (θJA = 43°C/W, θJC = 5°C/W), the MSOP offers slightly better board-level thermal resistance but higher junction-to-case resistance. In practice, both require solid thermal pad connection; the MSOP's larger exposed pad area (Pin 17) compensates for higher θJC, yielding comparable die temperature rise under identical PCB layout.
Can the LTC3111HMSE#PBF operate with VOUT higher than VIN, and how is efficiency affected?
Yes, the LTC3111HMSE#PBF operates seamlessly in boost mode (VOUT > VIN), e.g., generating 12V from 5V input. Efficiency remains high - up to 92% at 500mA load - due to low-RDS(ON) internal FETs and optimized gate drive. However, efficiency decreases at light loads in boost mode versus buck mode because of increased switching losses and fixed gate charge overhead relative to delivered power.
LTC3111HMSE#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LTC3111HMSE#PBF FAQ
1.How can I place an order for LTC3111HMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3111HMSE#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 LTC3111HMSE#PBF reliable?
The price and inventory of LTC3111HMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3111HMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3111HMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3111HMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3111HMSE#PBF?
LTC3111HMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3111HMSE#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 LTC3111HMSE#PBF?
For technical support, including LTC3111HMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3111HMSE#PBF requirements.
6.How does Aetrix verify that LTC3111HMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3111HMSE#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 LTC3111HMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3111HMSE#PBF?
All LTC3111HMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3111HMSE#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 LTC3111HMSE#PBF part is unused and in its original packaging.
Return procedure for LTC3111HMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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