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Analog Devices Inc. LTC3111EMSE#TRPBF
- Part No.:
- LTC3111EMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3111EMSE#TRPBF.pdf
- Description:
- IC REG BUCK BST ADJ 1.5A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,310
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Product details
Overview
LTC3111EMSE#TRPBF from Analog Devices (formerly Linear Technology) is a synchronous 4-switch buck-boost DC/DC converter with single-inductor architecture, supporting input and output voltages from 2.5V to 15V, delivering up to 1.5A continuous output current at 5VOUT (VIN ≥ 5V, PWM mode), and operating at 800kHz fixed frequency or synchronizable from 600kHz to 1.5MHz - used in battery-powered RF transmitters and industrial backup power systems.
For engineers reviewing the LTC3111EMSE#TRPBF datasheet, LTC3111EMSE#TRPBF pinout, LTC3111EMSE#TRPBF application, or LTC3111EMSE#TRPBF equivalent, key selection considerations include its seamless VIN-above/VIN-below-VOUT regulation, 49µA no-load quiescent current in Burst Mode®, accurate RUN-pin UVLO programming, and thermal performance on MSOP-16 with exposed PGND pad.
Technical Context
The LTC3111EMSE#TRPBF implements a voltage-mode control loop with internal 0.8V reference and error amplifier output on COMP pin, using a proprietary switching algorithm that enables continuous conduction across buck, buck-boost, and boost modes without inductor current discontinuity. Its four internal N-channel MOSFETs (SW1/SW2/BST1/BST2) are driven by charge-pump boosted gate drivers.
It integrates dual UVLO circuits (VIN and VCC), programmable RUN threshold with 120mV hysteresis, internal soft-start (2ms nominal), short-circuit protection via input current limit (2.3A typ) and peak current limit (5.8A typ), plus reverse current limiting (–1A) and thermal shutdown at ~175°C with automatic restart at ~170°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 15V - supports single/multi-cell Li-ion, alkaline/NiMH, supercapacitor, or wall adapter inputs without external pre-regulation. |
| Output Voltage Range | 2.5V to 15V - adjustable via FB resistor divider; maintains regulation whether VIN < VOUT, VIN > VOUT, or VIN ≈ VOUT. |
| Continuous Output Current | 1.5A at 5VOUT (VIN ≥ 5V, PWM mode) - sufficient for powering RF PA stages or FPGA I/O rails from wide-input sources. |
| Switching Frequency | 800kHz fixed (PWM mode); synchronizable 600kHz–1.5MHz - enables EMI optimization and avoids sensitive bands in comms systems. |
| Quiescent Current | 49µA in Burst Mode® - extends battery runtime in low-duty-cycle sensor or telemetry applications. |
| Efficiency | Up to 95% - achieved via low RDS(ON) internal MOSFETs (90mΩ SW1, 105mΩ SW2/BST1/BST2) and selectable PWM/Burst operation. |
| Shutdown Current | < 1µA - ensures minimal leakage during system sleep or storage. |
| Operating Temp Range | –40°C to +125°C (E-grade) - qualified for industrial and extended-temperature embedded environments. |
Pinout & Package
Package: 16-lead plastic MSOP (3mm × 4.9mm × 1.1mm) with exposed PGND pad (Pin 17), θJA = 40°C/W, θJC = 10°C/W. Exposed pad must be soldered to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| COMP (Pin 1) | Error amplifier output | Connects to external Type III compensation network (R-C-R) to stabilize voltage loop across full VIN/VOUT range. |
| FB (Pin 2) | Feedback input | Senses output via resistor divider; sets VOUT = 0.8V × (1 + R1/R2); leakage < 50nA preserves accuracy. |
| SNSGND (Pin 3) | Sense ground reference | Low-impedance return for FB and RUN dividers; separate from PGND to minimize noise coupling into control loop. |
| RUN (Pin 4) | Enable/UVLO programming | Enables IC when >1.18V (rising); disables at <1.08V (falling); hysteresis 120mV; allows custom turn-on threshold via resistive divider. |
| VIN (Pin 5) | Main input supply | Accepts 2.5V–15V; requires ≥10µF low-ESR ceramic bypass close to pin; absolute max 16V. |
| SW1 (Pin 6) | Switch node A/B connection | Connects to one end of external inductor and internal switches A & B; high dv/dt node requiring tight layout. |
| BST1 (Pin 7) | Bootstrap supply for SW1 driver | Connect 0.1µF ceramic capacitor to SW1; supplies gate drive for high-side switch A in buck mode. |
| PGND (Pins 8, 9, 17) | Power ground | Exposes large thermal pad (Pin 17) and two side pins; must be solidly connected to PCB ground plane with multiple vias. |
| SW2 (Pin 11) | Switch node C/D connection | Connects to other end of external inductor and internal switches C & D; complements SW1 in 4-switch topology. |
| VOUT (Pin 12) | Regulated output | Delivers 2.5V–15V; requires local 22µF low-ESR ceramic output cap; reverse current limited to –1A. |
| NC (Pin 13) | No connect | Internally unconnected; must be tied to GND per datasheet to prevent floating. |
| VCC (Pin 14) | Internal bias supply | Regulated ~4.2V output; powers internal circuitry and gate drivers; can be fed externally up to 5.5V. |
| PWM/SYNC (Pin 15) | Mode control & sync input | <0.5V → Burst Mode®; >1.5V → 800kHz PWM; 600kHz–1.5MHz square wave → synchronized operation. |
| SGND (Pin 16) | Signal ground | Reference for RUN and FB dividers; isolated from PGND to reduce switching noise injection into feedback path. |
Key Features
| Feature | Design Value |
|---|---|
| 4-switch single-inductor architecture | Eliminates need for separate buck + boost converters; enables seamless transition between modes with continuous inductor current. |
| Accurate programmable RUN threshold | Turn-on threshold settable from 0.35V to 1.15V (rising); hysteresis ensures stable enable/disable behavior under noisy input conditions. |
| Output disconnect in shutdown | VOUT is actively isolated from VIN during shutdown - prevents back-powering of source or load leakage paths. |
| Thermally enhanced MSOP package | 16-lead MSOP with exposed PGND pad delivers θJA = 40°C/W - supports 1.5A continuous output without forced air on 4-layer board. |
| Burst Mode® with 49µA IQ | Maintains regulation at light loads while minimizing idle power - critical for battery life in always-on IoT edge nodes. |
| Internal soft-start (2ms) | Controls output ramp rate independently of output capacitance or load; prevents inrush current and ensures reliable startup. |
Applications
| RF Transmitter Power Supply | Military Backup Power System |
|---|---|
|
Use Scenario: Powering 5V RF power amplifier stages from variable 3.3–12V battery or capacitor bank in portable radios. IC Role / Device Role / Timing Role: Buck-boost regulator maintaining stable 5V output regardless of battery discharge curve or transient load steps. Use Value: Enables consistent PA output power and linearity over full battery voltage range (e.g., 3S Li-ion: 9–12.6V or 2S: 6–8.4V). |
Use Scenario: Providing regulated 3.3V or 5V to mission-critical avionics or comms modules during main power failure. IC Role / Device Role / Timing Role: Seamless switchover from primary supply to backup supercapacitor or secondary battery without output dropout. Use Value: Input range (2.5–15V) accommodates both 12V vehicle bus and 5.5V supercap discharge; 1.5A output sustains critical loads. |
| Industrial Sensor Node | Multi-Cell Alkaline/NiMH Systems |
|
Use Scenario: Powering ultra-low-power microcontrollers and wireless transceivers (e.g., LoRa, BLE) from coin cell or AA batteries. IC Role / Device Role / Timing Role: Efficient step-up/down conversion with 49µA Burst Mode® IQ to maximize shelf life and operational duration. Use Value: Extends battery life >2× vs. LDO-based solutions; 2.5V min input allows operation down to near-dead battery voltage. |
Use Scenario: Regulating 3.3V or 5V from 1–3 alkaline or NiMH cells (1.2–4.8V range) in handheld test equipment or medical devices. IC Role / Device Role / Timing Role: Single-chip solution replacing discrete buck+boost combos; eliminates manual power-path selection logic. Use Value: Reduces BOM count and PCB area; 95% peak efficiency minimizes heat in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8390AEMSE#TRPBF | Higher 6A output capability; 2MHz max switching frequency; requires external MOSFETs; larger 20-lead TSSOP package. | Better suited for high-current motor drives or LED lighting; less optimal for space-constrained low-IQ battery apps. | Select LT8390A when >1.5A output or >1.5MHz sync is required; LTC3111EMSE#TRPBF remains preferred for compact, low-quiescent designs. |
| TPS63020DSJR | Lower 2.5A max output; fixed 2.5MHz switching; no SYNC pin; 100% duty cycle support; smaller 10-pin WSON package. | Optimized for consumer wearables with strict size limits; lacks programmable RUN UVLO and thermal derating visibility. | Choose TPS63020DSJR for cost-sensitive, high-volume wearable designs; LTC3111EMSE#TRPBF offers superior control flexibility and ruggedness for industrial use. |
Compared with LT8390AEMSE#TRPBF and TPS63020DSJR, the LTC3111EMSE#TRPBF uniquely balances 1.5A output, 49µA Burst Mode® IQ, programmable UVLO, and MSOP-16 thermal performance - making it optimal for space- and efficiency-constrained industrial and defense applications where reliability and design flexibility are prioritized over raw current or minimum footprint.
Availability
LTC3111EMSE#TRPBF is available at Aetrix Electronics and suitable for RF transmitter power supplies, military backup systems, and industrial sensor nodes requiring stable component supply with guaranteed long-term manufacturability and traceable sourcing.
Supply support for LTC3111EMSE#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 full product support, datasheets, and application engineering for legacy Linear parts including the LTC3111 series.
The LTC3111 belongs to Linear's high-efficiency, wide-input buck-boost regulator family - designed specifically for battery-powered, backup, and multi-rail industrial systems demanding seamless VIN/VOUT crossover and robust thermal management.
FAQ
What is the maximum continuous output current of the LTC3111EMSE#TRPBF?
The LTC3111EMSE#TRPBF delivers up to 1.5A continuous output current when configured for 5VOUT with VIN ≥ 5V in PWM mode. This rating assumes proper thermal design (e.g., 4-layer PCB with exposed PGND pad soldered). At lower VOUT or higher ambient temperatures, output current must be derated per the die temperature rise curves in the datasheet.
Does the LTC3111EMSE#TRPBF support synchronization to an external clock?
Yes, the LTC3111EMSE#TRPBF 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 maintain ≥100ns minimum high/low time, and the LTC3111EMSE#TRPBF locks to the input frequency using an internal PLL - enabling EMI reduction and timing coordination in multi-converter systems.
How does the RUN pin function on the LTC3111EMSE#TRPBF?
The RUN pin on the LTC3111EMSE#TRPBF serves dual functions: digital enable/disable (logic-high >1.18V enables, <1.08V disables) and programmable input UVLO threshold. Using a resistive divider from VIN to RUN sets precise turn-on/off points - e.g., 1.2V × (1 + R5/R6) - allowing customized brown-out protection without external comparators. The pin must never be left floating.
What package type and thermal characteristics apply to the LTC3111EMSE#TRPBF?
The LTC3111EMSE#TRPBF uses a 16-lead plastic MSOP package with exposed PGND pad (Pin 17). Its thermal resistance is θJA = 40°C/W and θJC = 10°C/W. To achieve rated performance, the exposed pad must be soldered to a PCB ground plane with multiple thermal vias - this configuration enables 1.5A continuous output at +125°C ambient on a standard 4-layer demo board.
Can the LTC3111EMSE#TRPBF operate with input voltage below the output voltage?
Yes, the LTC3111EMSE#TRPBF is explicitly designed for seamless operation when VIN is below, above, or equal to VOUT - enabled by its 4-switch buck-boost topology. For example, it regulates 5VOUT from a 3.3V input (boost mode) or 12V input (buck mode) without mode-switching artifacts or output dropout, making it ideal for dynamic battery-powered systems.
LTC3111EMSE#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
LTC3111EMSE#TRPBF FAQ
1.How can I place an order for LTC3111EMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3111EMSE#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 LTC3111EMSE#TRPBF reliable?
The price and inventory of LTC3111EMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3111EMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3111EMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3111EMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3111EMSE#TRPBF?
LTC3111EMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3111EMSE#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 LTC3111EMSE#TRPBF?
For technical support, including LTC3111EMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3111EMSE#TRPBF requirements.
6.How does Aetrix verify that LTC3111EMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3111EMSE#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 LTC3111EMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3111EMSE#TRPBF?
All LTC3111EMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3111EMSE#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 LTC3111EMSE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3111EMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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