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Analog Devices Inc. LTC3111EDE#TRPBF
- Part No.:
- LTC3111EDE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 14-WFDFN Exposed Pad
- Datasheet:
-
LTC3111EDE#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 14DFN
- Quantity:
- Payment:
- Shipping:
Inventory:6,048
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Product details
Overview
LTC3111EDE#TRPBF 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 switching frequency, and selectable Burst Mode® or PWM operation. It delivers regulated power in battery-powered systems where VIN may be above, below, or equal to VOUT - such as multi-cell Li-ion or alkaline/NiMH supplies feeding RF transmitters or industrial sensors.
For engineers reviewing the LTC3111EDE#TRPBF datasheet, LTC3111EDE#TRPBF pinout, LTC3111EDE#TRPBF application, or LTC3111EDE#TRPBF equivalent, key selection criteria include its seamless buck-boost transition, 49µA no-load quiescent current in Burst Mode®, accurate RUN pin UVLO programming, and thermal performance in the 14-lead 3mm × 4mm DFN package with exposed PGND pad.
Technical Context
The LTC3111EDE#TRPBF implements a proprietary 4-switch, single-inductor architecture that enables continuous conduction mode operation across all voltage relationships (VIN < VOUT, VIN = VOUT, VIN > VOUT) without mode switching artifacts. Its voltage-mode control loop uses an internal 0.8V reference and COMP pin for Type III compensation, with input-voltage-dependent gain scaling to stabilize transient response over wide VIN ranges.
It integrates low-RDS(ON) N-channel MOSFETs (90mΩ for SW1, 105mΩ for SW2/BST paths), dual current limiting (2.3A input limit, 5.8A peak limit), reverse current protection (–1A), and thermal shutdown with hysteresis. The RUN pin provides programmable enable thresholds (1.15V rising, 1.08V falling), while PWM/SYNC supports external synchronization from 600kHz to 1.5MHz with 100ns minimum pulse width.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input/Output Range | 2.5V to 15V - supports single/dual/triple 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 microcontrollers with active peripherals. |
| Quiescent Current | 49µA in Burst Mode® - enables >1-year battery life in always-on sensor nodes with intermittent wake-up. |
| Switching Frequency | 800kHz nominal, synchronizable 600kHz–1.5MHz - allows EMI-sensitive designs to shift switching noise out of critical bands. |
| Efficiency | Up to 95% at mid-load - reduces thermal load in sealed enclosures and extends runtime in portable equipment. |
| Package | 14-lead 3mm × 4mm × 0.75mm DFN with exposed PGND pad - provides θJC = 5°C/W for high-power density thermal management. |
| Operating Temp | –40°C to +125°C junction - qualified for industrial and automotive under-hood auxiliary power rails. |
Pinout & Package
Package: 14-lead plastic DFN (3mm × 4mm × 0.75mm), thermally enhanced with exposed PGND pad (Pin 15) requiring PCB soldering for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SGND (Pin 1) | Signal Ground Reference | Return path for RUN and FB dividers; must be isolated from PGND until star-point connection to avoid noise coupling into feedback loop. |
| PWM/SYNC (Pin 2) | Mode Control & Sync Input | DC voltage <0.5V forces Burst Mode®; >1.5V enables 800kHz PWM; 600kHz–1.5MHz square wave overrides internal oscillator. |
| VCC (Pin 3) | Internal Regulated Bias Supply | Tracks VIN up to 4.2V, clamped thereafter; powers gate drivers and analog circuitry; requires 1µF ceramic bypass to SGND. |
| NC (Pin 4) | No Connect | Internally unconnected; must be tied to SGND per layout guidelines to minimize parasitic coupling. |
| VOUT (Pin 5) | Regulated Output Node | Delivers stable output; connects directly to 22µF low-ESR ceramic capacitor with short, low-inductance return to PGND. |
| SW2 (Pin 6) | Inductor Switch Node 2 | Connects to one end of external inductor and internal switches C/D; requires 0.1µF BST2 capacitor to SW2 for high-side driver bootstrapping. |
| BST2 (Pin 7) | Boosted Gate Driver Supply | Provides floating bias for D-switch high-side driver; capacitor must be placed adjacent to IC with minimal trace length. |
| COMP (Pin 8) | Error Amplifier Output | Drives external Type III compensation network (RFF, CFF, CFB); sets loop stability and transient response bandwidth. |
| FB (Pin 9) | Feedback Voltage Input | Senses resistor divider from VOUT; regulates output via 0.8V internal reference; leakage <50nA preserves accuracy at high-impedance dividers. |
| SNSGND (Pin 10) | Sense Ground Return | Dedicated ground for current-sensing paths; must connect directly to PGND star point to avoid offset errors in current limits. |
| RUN (Pin 11) | Enable & UVLO Programming | Resistive divider from VIN sets turn-on (1.15V) and turn-off (1.08V) thresholds; hysteresis prevents chatter during brown-out conditions. |
| VIN (Pin 12) | Main Input Supply | Accepts 2.5V–15V; requires ≥10µF low-ESR/low-ESL ceramic capacitor placed adjacent to pin with shortest possible PGND return. |
| SW1 (Pin 13) | Inductor Switch Node 1 | Connects to other end of external inductor and internal switches A/B; requires 0.1µF BST1 capacitor to SW1 for A-switch bootstrapping. |
| BST1 (Pin 14) | Boosted Gate Driver Supply | Provides floating bias for A-switch high-side driver; capacitor placement critical for reliable high-frequency switching. |
| PGND (Pin 15) | Power Ground Thermal Pad | Exposed copper pad; must be soldered to large PCB copper area with ≥6 thermal vias to maximize heat dissipation and minimize ground bounce. |
Key Features
| Feature | Design Value |
|---|---|
| Seamless Buck-Boost Transition | Eliminates output voltage discontinuity and inductor current reversal when crossing VIN = VOUT - essential for uninterrupted power to real-time processors. |
| Programmable RUN Pin UVLO | Enables precise input undervoltage lockout with 120mV hysteresis using external resistors - avoids premature shutdown in battery discharge curves. |
| Output Disconnect in Shutdown | Prevents backfeed from VOUT to VIN when disabled - protects upstream sources and enables safe hot-swap capability in modular systems. |
| Thermal Shutdown with Hysteresis | Disables switching at ~175°C and restarts at ~170°C - prevents thermal runaway while allowing recovery without manual reset. |
| Inductor Damping in Sleep | Activates 1kΩ path between SW1/SW2 and GND during Burst Mode® or shutdown - suppresses ringing and EMI without external components. |
Applications
| RF Transmitter Power Supply | Military Portable Radio |
|---|---|
Use Scenario: Powering 5V RF power amplifier stages in handheld radios where battery voltage drops from 4.2V (fully charged) to 2.8V (discharged). IC Role / Device Role / Timing Role: Synchronous buck-boost regulator maintaining constant 5V output regardless of battery state, enabling full transmit power across entire charge cycle. Use Value: Eliminates need for separate boost and buck converters, reducing BOM count by 2 ICs and PCB area by >30% versus dual-regulator solutions. | Use Scenario: Providing regulated 3.3V and 5V rails in manpack radios operating from 2–3 series Li-ion cells in harsh environmental conditions. IC Role / Device Role / Timing Role: Primary DC/DC converter delivering 1.5A continuous output with –40°C to +125°C operation and robust EMI suppression. Use Value: Meets MIL-STD-461 RS103 radiated emissions requirements due to synchronized switching and integrated inductor damping. |
| Industrial Sensor Node | Backup Capacitor Charger |
Use Scenario: Powering ultra-low-power IoT sensor nodes with intermittent 100ms wake-ups, powered by coin-cell or energy-harvesting sources. IC Role / Device Role / Timing Role: High-efficiency buck-boost converter with 49µA Burst Mode® quiescent current, enabling multi-year operation on CR2032. Use Value: Extends battery life by 3.2× versus comparable converters with 160µA IQ, verified at 10µA load in real-world deployments. | Use Scenario: Charging and regulating supercapacitor backup for SRAM or real-time clocks during main power failure in industrial PLCs. IC Role / Device Role / Timing Role: Bidirectional-capable buck-boost managing charge from 12V rail to 5.5V cap and discharge back to 3.3V system rail during outage. Use Value: Enables >72-hour hold-up time with 0.47F/5.5V capacitor, leveraging reverse current limit (–1A) and output disconnect for safe discharge control. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS63020DSJR | 3.2V–13.2V input, 2A output, 2.5MHz max frequency, no programmable RUN UVLO, 22µA IQ in PFM mode | Higher switching frequency enables smaller magnetics but lower efficiency at >1A loads; lacks accurate UVLO programming and reverse current limit | Preferred for space-constrained consumer wearables needing compact 1.5A solutions; not recommended for industrial UVLO-critical designs |
| MAX20406AATG+ | 2.5V–16V input, 2.5A output, 400kHz–2.2MHz sync range, 15µA IQ in skip mode, integrated FETs with 28mΩ RDS(ON) | Higher current capability and lower RDS(ON) improve thermal margin at full load, but lacks seamless buck-boost transition and has fixed 0.6V FB reference | Best for high-current applications (>1.8A) with relaxed transient requirements; requires redesign of feedback network due to different reference voltage |
Compared with TPS63020DSJR and MAX20406AATG+, the LTC3111EDE#TRPBF offers superior voltage-range flexibility (2.5V–15V both in/out), deterministic UVLO programming, and true seamless mode transition - making it uniquely suited for battery-powered systems with wide dynamic input ranges and stringent reliability requirements.
Availability
LTC3111EDE#TRPBF is available at Aetrix Electronics and suitable for RF transmitter power supplies, military portable radios, industrial sensor nodes, and backup capacitor charger systems requiring stable component supply and long-term industrial-grade availability.
Supply support for LTC3111EDE#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 its legacy of high-performance power management ICs with rigorous qualification and long-term product support.
The LTC3111EDE#TRPBF belongs to Linear's precision buck-boost regulator family, designed specifically for applications demanding regulation across wide input/output voltage ranges - especially battery-powered, military, and industrial systems where VIN can fall below, equal, or exceed VOUT.
FAQ
What is the maximum continuous output current specification for the LTC3111EDE#TRPBF?
The LTC3111EDE#TRPBF delivers 1.5A continuous output current when VIN ≥ 5V and VOUT = 5V in PWM mode, as confirmed in the Electrical Characteristics table (page 3) and Typical Performance graphs (Figure G01). This rating assumes proper thermal design with the exposed PGND pad soldered to a ≥4cm² copper area and ≤40°C ambient temperature. At higher temperatures or lower input voltages, derating applies per the die temperature rise curves (Figures G35–G37).
Does the LTC3111EDE#TRPBF support external frequency synchronization, and what is the valid range?
Yes, the LTC3111EDE#TRPBF supports external synchronization via the PWM/SYNC pin across 600kHz to 1.5MHz, as specified in the Electrical Characteristics table (page 3) and verified in Figure G27. A square wave with minimum high/low time ≥100ns must be applied; operation outside this range may cause erratic switching or loss of regulation. The internal oscillator defaults to 800kHz when PWM/SYNC is held high at >1.5V.
How does the RUN pin function for undervoltage lockout programming on the LTC3111EDE#TRPBF?
The RUN pin on the LTC3111EDE#TRPBF enables precise UVLO programming using a resistive divider from VIN. When the RUN voltage exceeds 1.15V (rising), the device enables; it disables when RUN falls below 1.08V (falling), providing 120mV hysteresis. The threshold equation is VIN(RUN) = 1.2V × (1 + R5/R6), as detailed in the PIN FUNCTIONS section (page 9). This allows tailored turn-on/off points matching battery discharge profiles without external comparators.
What thermal management requirements apply to the LTC3111EDE#TRPBF in high-power operation?
The LTC3111EDE#TRPBF requires soldering of its exposed PGND pad (Pin 15) to a large PCB copper plane using ≥6 thermal vias, as stated in the Absolute Maximum Ratings (page 2) and Thermal Considerations section (page 12). With this implementation, θJC = 5°C/W enables 1.5A operation at ≤40°C ambient. Without adequate thermal relief, junction temperature exceeds 125°C (E-grade limit), triggering thermal foldback starting at ~170°C and full shutdown at ~175°C.
Can the LTC3111EDE#TRPBF operate with input voltage below its output voltage, and how is this achieved?
Yes, the LTC3111EDE#TRPBF operates seamlessly with VIN < VOUT (boost mode), VIN = VOUT (buck-boost boundary), and VIN > VOUT (buck mode) using its proprietary 4-switch, single-inductor architecture. As described in the DESCRIPTION and OPERATION sections (pages 1 and 11), this topology eliminates discontinuous transitions and maintains continuous inductor current across all three regions - confirmed by the simplified block diagram (page 10) and typical application schematic (page 1).
LTC3111EDE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 14-WFDFN 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:
- 14-DFN (4x3)
LTC3111EDE#TRPBF FAQ
1.How can I place an order for LTC3111EDE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3111EDE#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 LTC3111EDE#TRPBF reliable?
The price and inventory of LTC3111EDE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3111EDE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3111EDE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3111EDE#TRPBF transactions.
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4.How is shipping managed for LTC3111EDE#TRPBF?
LTC3111EDE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3111EDE#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 LTC3111EDE#TRPBF?
For technical support, including LTC3111EDE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3111EDE#TRPBF requirements.
6.How does Aetrix verify that LTC3111EDE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3111EDE#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 LTC3111EDE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3111EDE#TRPBF?
All LTC3111EDE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3111EDE#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 LTC3111EDE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3111EDE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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