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Analog Devices Inc. LTC3111EMSE#PBF
- Part No.:
- LTC3111EMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3111EMSE#PBF.pdf
- Description:
- IC REG BUCK BST ADJ 1.5A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:234
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Product details
Overview
LTC3111EMSE#PBF from Analog Devices (formerly Linear Technology) is a synchronous 4-switch buck-boost DC/DC converter IC designed for wide-input, wide-output voltage regulation in battery-powered and industrial power systems. It delivers up to 1.5A continuous output current at 5V with VIN ≥ 5V in PWM mode, operates across 2.5V–15V input and output ranges, and features 800kHz fixed-frequency or synchronizable 600kHz–1.5MHz operation - enabling stable 5V or 3.3V rail generation from single/multi-cell Li-ion, alkaline, or capacitor-based sources.
For engineers reviewing the LTC3111EMSE#PBF datasheet, LTC3111EMSE#PBF pinout, LTC3111EMSE#PBF application, or LTC3111EMSE#PBF equivalent, key selection considerations include its seamless buck-boost transition capability, accurate RUN-pin UVLO programming (1.15V enable threshold), 49µA no-load quiescent current in Burst Mode®, and thermal shutdown protection with automatic restart at ~170°C junction temperature.
Technical Context
The LTC3111EMSE#PBF implements a proprietary 4-switch, single-inductor architecture that enables continuous conduction-mode regulation regardless of whether VIN is above, below, or equal to VOUT - eliminating mode-switching discontinuities and associated output ripple. Its voltage-mode control loop uses an internal 0.8V reference and error amplifier with COMP pin for external Type III compensation.
It integrates low-RDS(ON) N-channel MOSFETs (90mΩ for SW1 switch A; 105mΩ for switches B/C/D), supports dual power-path control via PWM/SYNC pin (Burst Mode® <0.5V, PWM >1.5V, sync signal 600kHz–1.5MHz), and provides independent input current limiting (2.3A typ), peak current limiting (5.8A), and reverse current limiting (–1A) - all with built-in hysteresis and thermal derating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 15V - supports direct regulation from 1–3 Li-ion cells, multi-cell alkaline/NiMH, or backup supercapacitors without pre-regulation. |
| Output Voltage Range | 2.5V to 15V - programmable via FB resistor divider; maintains regulation even when VIN crosses VOUT during battery discharge. |
| Continuous Output Current | 1.5A at 5VOUT with VIN ≥ 5V in PWM mode - sufficient for powering RF transmitters, microcontrollers, or industrial sensors. |
| Switching Frequency | 800kHz nominal, synchronizable 600kHz–1.5MHz - enables EMI optimization and inductor size reduction while maintaining light-load efficiency. |
| No-Load Quiescent Current | 49µA in Burst Mode® - extends battery life in always-on IoT or remote monitoring applications. |
| Shutdown Current | <1µA - ensures minimal drain on backup power sources during system sleep or fault conditions. |
| Efficiency Peak | Up to 95% - achieved at mid-load with VIN = VOUT = 5V, minimizing thermal stress and power loss in compact layouts. |
Pinout & Package
Package: 16-lead plastic MSOP (3mm × 4.9mm × 1.1mm), thermally enhanced with exposed PGND pad (Pin 17). Requires soldering of exposed pad to PCB ground plane for thermal performance (θJA = 40°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 feedback loop across full VIN/VOUT range. |
| FB (Pin 2) | Feedback voltage input | Senses output via resistor divider; 0.8V reference enables precise VOUT programming from 2.5V to 15V. |
| SNSGND (Pin 3) | Sense ground reference | Provides dedicated low-noise ground return for FB and RUN dividers - must be routed separately from PGND. |
| RUN (Pin 4) | Enable/UVLO control input | Programmable turn-on threshold (1.15V typ); enables custom input undervoltage lockout with 120mV hysteresis. |
| VIN (Pin 5) | Main input supply | Accepts 2.5V–15V; requires ≥10µF low-ESR ceramic bypass capacitor placed adjacent to pin with short ground return. |
| SW1 (Pin 6) | Switch node A/B connection | Connects to one end of external inductor and internal N-MOSFETs A & B - high dv/dt node requiring careful layout. |
| BST1 (Pin 7) | Bootstrap supply for SW1 driver | Requires 0.1µF ceramic capacitor to SW1; supplies gate drive voltage for high-side switch A. |
| BST2 (Pin 10) | Bootstrap supply for SW2 driver | Requires 0.1µF ceramic capacitor to SW2; supplies gate drive voltage for high-side switch D. |
| SW2 (Pin 11) | Switch node C/D connection | Connects to other end of external inductor and internal N-MOSFETs C & D - second high dv/dt node. |
| VOUT (Pin 12) | Regulated output | Delivers stable output; requires local 22µF low-ESR ceramic capacitor with short ground path to SGND/PGND. |
| NC (Pin 13) | No connect | Internally unused; must be connected to GND per datasheet to minimize noise coupling. |
| VCC (Pin 14) | Internal bias supply | Regulated ~4.2V output; powers internal circuitry and drivers; accepts 1µF ceramic bypass and optional external 5.5V supply. |
| PWM/SYNC (Pin 15) | Mode control & frequency sync | Digital input: <0.5V → Burst Mode®, >1.5V → PWM, 600kHz–1.5MHz square wave → synchronized operation. |
| SGND (Pin 16) | Signal ground | Reference for FB and RUN dividers; must be isolated from PGND except at single-point star ground. |
| PGND (Pin 8, 9, Exposed Pad 17) | Power ground | High-current return for switches and inductor; exposed pad must be soldered to large PCB ground plane with multiple vias. |
Key Features
| Feature | Design Value |
|---|---|
| Seamless buck-boost topology | 4-switch single-inductor architecture eliminates output voltage discontinuity when VIN crosses VOUT - critical for stable MCU or RF supply during battery discharge. |
| Programmable RUN-pin UVLO | Accurate 1.15V enable threshold with 120mV hysteresis allows precise input voltage supervision without external comparators. |
| Burst Mode® operation | 49µA no-load IQ enables >1000-hour standby on coin cell; automatically transitions to PWM under load to maintain regulation. |
| Integrated protection suite | Includes input current limit (2.3A), peak current limit (5.8A), reverse current limit (–1A), thermal shutdown (~175°C), and internal soft-start (2ms). |
| Thermally optimized MSOP package | Exposed PGND pad and low θJA (40°C/W) support 1.5A continuous output in compact industrial or portable designs without forced air. |
Applications
| Portable Medical Sensors | Industrial Backup Power Systems |
|---|---|
|
Use Scenario: Continuous glucose monitor powered by single Li-ion cell with aging voltage drop from 4.2V to 2.8V. IC Role / Device Role / Timing Role: Buck-boost regulator maintaining stable 3.3V rail for ADC, BLE radio, and microcontroller regardless of battery state. Use Value: Eliminates need for separate buck and boost stages; 95% peak efficiency extends battery life; 49µA Burst Mode® IQ enables multi-day operation. |
Use Scenario: PLC I/O module with supercapacitor backup sustaining 5V rail during AC mains failure. IC Role / Device Role / Timing Role: Bidirectional voltage regulator accepting 2.5V–15V from capacitor bank and delivering regulated 5V to logic and analog circuitry. Use Value: Seamless transition between main supply and backup avoids brownout resets; reverse current limit prevents capacitor over-discharge. |
| RF Transmitter Power Supply | Military Handheld Radios |
|
Use Scenario: UHF transmitter requiring clean 5V rail with fast transient response during burst transmission. IC Role / Device Role / Timing Role: Primary DC/DC converter supplying PA bias and digital core; PWM mode ensures consistent 1.5A delivery during 100ms transmit bursts. Use Value: 800kHz switching minimizes output filter size; low-noise fixed-frequency operation reduces RF interference; soft-start prevents inrush-induced supply sag. |
Use Scenario: Ruggedized handheld radio operating from 2–3 NiMH cells (2.4V–4.5V) while delivering 3.3V and 5V rails. IC Role / Device Role / Timing Role: Main system regulator supporting wide input range and meeting MIL-STD-810H thermal/EMI requirements. Use Value: –40°C to 125°C operating range ensures reliability in extreme environments; exposed-pad MSOP aids conduction cooling; 1µA shutdown current preserves battery during storage. |
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 current, wider 2.7V–100V input, requires external MOSFETs, larger solution size. | Targeted at automotive and high-voltage industrial systems; not pin-compatible; needs different compensation and layout. | Select when >1.5A output or >15V input is required; avoid for space-constrained portable designs due to external FETs and larger footprint. |
| TPS63020DSJR | Lower 2.5A max output, 2.5V–5.5V input, integrated compensation, smaller 2mm × 2mm QFN package. | Optimized for ultra-compact consumer electronics; lacks programmable RUN UVLO and sync capability; lower thermal rating (–40°C to 85°C). | Select for cost-sensitive, low-power portable devices where 5V input ceiling and reduced feature set are acceptable; verify thermal margin at 1.5A. |
Compared with LT8390EMSE#PBF and TPS63020DSJR, the LTC3111EMSE#PBF uniquely balances wide 2.5V–15V I/O range, precise RUN-pin programmability, and thermally robust MSOP packaging - making it optimal for industrial and military battery-powered systems needing reliable 1.5A regulation without external FETs or complex layout.
Availability
LTC3111EMSE#PBF is available at Aetrix Electronics and suitable for portable medical sensors, industrial backup power systems, RF transmitter power supplies, and military handheld radios requiring stable component supply across extended temperature and voltage ranges.
Supply support for LTC3111EMSE#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving precision instrumentation, industrial automation, aerospace, and communications markets.
The LTC3111 product line was designed specifically for wide-input, wide-output buck-boost regulation in battery-critical and thermally constrained applications - emphasizing seamless mode transition, low-quiescent current, and robust protection for mission-critical power systems.
FAQ
What is the maximum continuous output current of the LTC3111EMSE#PBF?
The LTC3111EMSE#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 using the exposed PGND pad and a 4-layer PCB with adequate copper area. At lower input voltages (e.g., VIN = 3.3V), output current is limited by the 2.3A input current limit and efficiency derating.
Can the LTC3111EMSE#PBF regulate output voltage when input voltage drops below the output setting?
Yes, the LTC3111EMSE#PBF is explicitly designed for this use case. Its 4-switch buck-boost architecture enables seamless regulation even when VIN falls below VOUT - for example, maintaining 5V output from a discharging 2-cell Li-ion battery (4.2V → 2.8V). No external circuitry or mode switching is required; the IC automatically transitions between buck, buck-boost, and boost phases.
How does the RUN pin function in the LTC3111EMSE#PBF?
The RUN pin on the LTC3111EMSE#PBF serves dual functions: enabling/disabling the IC and programming custom input UVLO thresholds. With a resistive divider from VIN to GND, it sets precise turn-on (1.15V typical) and turn-off (1.08V typical) points with 120mV hysteresis. Direct connection to VIN enables the device continuously, provided VIN stays within absolute maximum ratings (≤16V).
What is the purpose of the BST1 and BST2 pins on the LTC3111EMSE#PBF?
BST1 and BST2 are bootstrap supply pins for the high-side N-channel MOSFET drivers. BST1 connects via a 0.1µF capacitor to SW1 to generate gate drive voltage for switch A; BST2 connects similarly to SW2 for switch D. These floating supplies enable efficient high-side switching without requiring P-channel devices or charge pumps - critical for achieving low RDS(ON) and high efficiency.
Does the LTC3111EMSE#PBF support synchronization to an external clock?
Yes, the LTC3111EMSE#PBF supports external frequency synchronization via the 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 maintain ≥100ns minimum high/low time, and the IC's PLL ensures jitter-free operation essential for noise-sensitive applications like RF systems.
LTC3111EMSE#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
LTC3111EMSE#PBF FAQ
1.How can I place an order for LTC3111EMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3111EMSE#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 LTC3111EMSE#PBF reliable?
The price and inventory of LTC3111EMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3111EMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3111EMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3111EMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3111EMSE#PBF?
LTC3111EMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3111EMSE#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 LTC3111EMSE#PBF?
For technical support, including LTC3111EMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3111EMSE#PBF requirements.
6.How does Aetrix verify that LTC3111EMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3111EMSE#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 LTC3111EMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3111EMSE#PBF?
All LTC3111EMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3111EMSE#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 LTC3111EMSE#PBF part is unused and in its original packaging.
Return procedure for LTC3111EMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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