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Analog Devices Inc. LTC3111EDE#PBF
- Part No.:
- LTC3111EDE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 14-WFDFN Exposed Pad
- Datasheet:
-
LTC3111EDE#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 14DFN
- Quantity:
- Payment:
- Shipping:
Inventory:572
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Product details
Overview
LTC3111EDE#PBF from Analog Devices (formerly Linear Technology) is a synchronous 4-switch buck-boost DC/DC converter IC designed for seamless regulation where input voltage may be above, below, or equal to output voltage. It delivers up to 1.5A continuous output current at 5V with 2.5V–15V input/output range, 800kHz fixed switching frequency, and operates in PWM or Burst Mode® with 49µA no-load quiescent current. It is used in battery-powered RF transmitters requiring stable 3.3V/5V rails from variable Li-ion or alkaline sources.
For engineers reviewing the LTC3111EDE#PBF datasheet, LTC3111EDE#PBF pinout, LTC3111EDE#PBF application, or LTC3111EDE#PBF equivalent, key selection criteria include its 4-switch single-inductor architecture, programmable RUN threshold (1.18V typ enable), ±120mV UVLO hysteresis, internal soft-start, and thermal shutdown-critical for industrial power systems and military-grade backup supplies where VIN/VOUT crossover and low-noise operation are mandatory.
Technical Context
The LTC3111EDE#PBF implements a proprietary voltage-mode control loop with an integrated error amplifier (COMP pin), analog divider for gain stabilization across buck/boost modes, and dual current-limit protection: 3A average input current limit with 5.8A peak limit and –1A reverse current clamp. Its 4-switch topology enables continuous conduction mode transitions without inductor current discontinuity during VIN-to-VOUT crossovers.
It features a phase-locked loop (PLL) for external synchronization between 600kHz–1.5MHz via PWM/SYNC pin, internal 4.2V VCC clamp, and active inductor damping (1kΩ SW1–SW2–GND path) during shutdown/Burst Mode to suppress ringing. Thermal foldback begins at ~170°C junction, with full shutdown at ~175°C and 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, NiMH, alkaline, supercapacitor, or wall adapter inputs while regulating stable output across all VIN/VOUT relationships. |
| Max Continuous Output Current | 1.5A at VIN ≥ 5V, VOUT = 5V, PWM mode - sufficient for RF PA biasing and FPGA core rails without external current boosting. |
| Switching Frequency | 800kHz fixed (typ), synchronizable 600kHz–1.5MHz - enables EMI filtering optimization and avoids sensitive bands in wireless modules. |
| Quiescent Current | 49µA in Burst Mode® - extends battery life in always-on sensor nodes and low-duty-cycle telemetry devices. |
| Efficiency | Up to 95% at mid-load - achieved via low RDS(ON) N-channel MOSFETs (90mΩ SW1, 105mΩ SW2–SW4) and adaptive mode selection. |
| RUN Pin Threshold | 1.18V (rising) with 120mV hysteresis - allows precise, resistor-programmable undervoltage lockout for battery end-of-discharge detection. |
| Shutdown Current | <1µA - ensures minimal leakage drain in storage or deep-sleep states for portable medical and IoT edge devices. |
Pinout & Package
Package: 14-lead (4mm × 3mm × 0.75mm) plastic DFN with exposed PGND pad (Pin 15). Thermally enhanced layout requires soldering exposed pad to PCB ground plane using multiple vias for θJC = 5°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SGND (Pin 1) | Signal Ground Reference | Return node for RUN and FB dividers; must be isolated from PGND until single-point tie to minimize noise coupling into feedback path. |
| 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 oscillator for EMI spread-spectrum control. |
| VCC (Pin 3) | Internal Bias Supply | Regulated ~4.2V supply for gate drivers and logic; tracks VIN up to clamp voltage; requires 1µF ceramic bypass to SGND. |
| NC (Pin 4) | No Connect | Internally unconnected; must be tied to GND per datasheet to prevent floating node noise injection. |
| VOUT (Pin 5) | Regulated Output Node | Delivers regulated output; requires low-ESR ceramic capacitor (e.g., 22µF X5R) placed adjacent to pin with short SGND return. |
| SW2 (Pin 6) | Inductor Switch Node 2 | Connects to one end of external inductor and internal switches C/D; high dv/dt node requiring tight layout and guard ring. |
| BST2 (Pin 7) | Floating Boost Supply for D-Switch | Requires 0.1µF ceramic capacitor to SW2; provides gate drive voltage above SW2 for N-channel high-side switch D. |
| COMP (Pin 8) | Error Amplifier Output | Drives external Type III compensation network (RFF/CFF/CFB); loop stability depends on proper pole-zero placement here. |
| FB (Pin 9) | Feedback Voltage Input | Senses output via resistor divider; 0.8V reference enables 2.5V–15V adjustable VOUT using VOUT = 0.8V × (1 + R1/R2). |
| SNSGND (Pin 10) | Sense Ground | Dedicated ground for current sensing paths; must connect directly to PGND at single point near exposed pad. |
| RUN (Pin 11) | Enable & UVLO Programming | Resistor-divider from VIN sets turn-on (1.18V) and turn-off (1.08V) thresholds; ties directly to VIN for always-on operation. |
| VIN (Pin 12) | Main Input Supply | 2.5V–15V input; requires ≥10µF low-ESR/low-ESL ceramic capacitor placed within 2mm with shortest possible PGND return. |
| SW1 (Pin 13) | Inductor Switch Node 1 | Connects to other end of external inductor and internal switches A/B; complements SW2 in 4-switch buck-boost topology. |
| BST1 (Pin 14) | Floating Boost Supply for A-Switch | Requires 0.1µF ceramic capacitor to SW1; provides gate drive voltage above SW1 for N-channel high-side switch A. |
| PGND (Exposed Pad) | Power Ground Return | Primary thermal and current return path; must be soldered to large copper pour with ≥6 thermal vias to inner ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| 4-Switch Single-Inductor Architecture | Enables seamless buck-boost transition without output dropout or inductor current reversal during VIN/VOUT crossover-critical for battery voltage sag scenarios. |
| Programmable RUN Threshold with Hysteresis | Allows accurate, resistor-set input UVLO (e.g., 2.7V cutoff for Li-ion) with 120mV hysteresis to prevent oscillation near threshold during load transients. |
| Internal Soft-Start (2ms nominal) | Prevents inrush current and output overshoot during power-up; remains active during thermal shutdown recovery for controlled restart. |
| Output Disconnect in Shutdown | Isolates VOUT from VIN when disabled-eliminates backfeed in multi-rail systems and preserves battery charge in standby. |
| Thermal Foldback & Shutdown | Gradually reduces current limit above 170°C and fully disables at 175°C, protecting MOSFETs and PCB traces during sustained overload or poor heatsinking. |
Applications
| RF Transmitter Power Supply | Military Backup Power System |
|---|---|
|
Use Scenario: Providing stable 5V rail to GaAs RF power amplifier in handheld tactical radio operating from 2–3S Li-ion (6–12.6V) with rapid load steps. IC Role / Device Role / Timing Role: Buck-boost regulator maintaining constant VOUT despite battery voltage decay and PA burst current demands. Use Value: 95% efficiency at 1A and 49µA Burst Mode quiescent current extend operational time; 800kHz switching enables compact 4.7µH inductor and low-profile 22µF output cap. |
Use Scenario: Regulating 3.3V for mission-critical microcontroller and sensors from wide-range 2.5–15V backup capacitor bank after main power failure. IC Role / Device Role / Timing Role: Seamless voltage translator ensuring uninterrupted operation as capacitor discharges from 15V down to 2.5V. Use Value: Input/output range matching capacitor discharge curve eliminates need for secondary converters; thermal shutdown protects system during extended overloads. |
| Industrial Sensor Node | Multi-Cell Alkaline/NiMH Portable Device |
|
Use Scenario: Powering ultra-low-power LoRaWAN sensor node from two AA alkaline cells (1.8–3.2V) while delivering regulated 3.3V to MCU and transceiver. IC Role / Device Role / Timing Role: Boost-mode regulator during battery depletion, transitioning to buck-boost as cell voltage rises post-insertion. Use Value: 49µA Burst Mode current minimizes self-discharge; RUN pin programming enables precise 1.8V brownout detection to trigger graceful shutdown before data loss. |
Use Scenario: Generating 5V for USB peripheral interface from three NiMH cells (3.6–4.5V) in portable test equipment with variable load profiles. IC Role / Device Role / Timing Role: Buck-boost regulator compensating for cell imbalance and voltage droop under 1A pulsed loads. Use Value: 1.5A continuous capability handles USB charging bursts; internal soft-start prevents reset glitches during hot-plug events. |
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 | Lower max input (5.5V), lower output current (2A), fixed 2.5MHz switching, no RUN-programmable UVLO. | Optimized for space-constrained consumer wearables; lacks wide VIN/VOUT range and precision enable threshold needed for industrial battery systems. | Select only if input stays ≤5.5V and board area is critical; verify UVLO behavior with external circuitry. |
| MAX20406AATG+T | Higher max input (16V), 3A output, 2.2MHz switching, I²C programmability, but no Burst Mode and higher 25µA shutdown current. | Targets automotive infotainment with digital control; lacks ultra-low quiescent current and seamless VIN/VOUT crossover for battery longevity. | Choose when digital configuration and higher current are required; avoid where <50µA quiescent current is mandatory for >1-year battery life. |
Compared with TPS63020DSJR and MAX20406AATG+T, the LTC3111EDE#PBF uniquely balances 2.5V–15V bidirectional regulation, 49µA Burst Mode, and resistor-programmable RUN threshold-making it optimal for long-life, wide-input industrial and defense applications where fixed-frequency noise and thermal robustness are non-negotiable.
Availability
LTC3111EDE#PBF is available at Aetrix Electronics and suitable for RF transmitter power supplies, military backup systems, industrial sensor nodes, and multi-cell alkaline/NiMH portable devices requiring stable component supply across extended temperature ranges (–40°C to 125°C).
Supply support for LTC3111EDE#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 with rigorous automotive and military qualification standards.
The LTC3111EDE#PBF belongs to Linear's precision buck-boost regulator product line, engineered for applications demanding seamless VIN/VOUT crossover, ultra-low quiescent current, and robust thermal protection in harsh environments.
FAQ
What is the maximum output current capability of the LTC3111EDE#PBF under typical conditions?
The LTC3111EDE#PBF delivers up to 1.5A continuous output current when VIN ≥ 5V and VOUT = 5V in PWM mode. This rating assumes proper thermal design with the exposed PGND pad soldered to a multilayer PCB ground plane. At lower input voltages (e.g., 2.7V), output current is reduced due to input current limiting and efficiency drop-consult the "Maximum Output Current vs VIN" graph in the datasheet for exact derating curves.
Can the LTC3111EDE#PBF operate with input voltage equal to output voltage?
Yes, the LTC3111EDE#PBF is specifically designed for seamless operation when VIN equals VOUT, leveraging its 4-switch architecture to maintain regulation without dropout or mode-switching artifacts. This behavior is confirmed in the typical performance graphs showing stable efficiency and output ripple across VIN = VOUT = 5V, and is essential for applications like battery-backed systems where input voltage decays through the regulated output level.
How does the RUN pin function in the LTC3111EDE#PBF, and what is its threshold accuracy?
The RUN pin on the LTC3111EDE#PBF provides both enable/disable control and programmable input UVLO. Its rising threshold is 1.18V (±0.05V) with 120mV hysteresis, allowing precise resistor-divider setup for battery cutoff (e.g., 2.7V for Li-ion). The pin can be driven by logic or tied directly to VIN for always-on operation. Accuracy is specified over –40°C to 125°C junction temperature, ensuring reliable startup/shutdown across industrial environments.
What package type and thermal characteristics define the LTC3111EDE#PBF?
The LTC3111EDE#PBF uses a 14-lead 4mm × 3mm × 0.75mm plastic DFN package with an exposed PGND pad (Pin 15). Its thermal resistance is θJA = 43°C/W and θJC = 5°C/W when properly mounted-requiring soldering the exposed pad to a PCB ground plane with ≥6 thermal vias. Junction temperature must stay below 125°C for E-grade operation, with thermal foldback initiating at ~170°C.
Does the LTC3111EDE#PBF support external frequency synchronization, and what is the valid range?
Yes, the LTC3111EDE#PBF supports external synchronization via the PWM/SYNC pin across 600kHz to 1.5MHz using a square wave with ≥100ns minimum high/low time. This PLL-based sync allows EMI reduction through spread-spectrum techniques or alignment with system clocks. The internal oscillator defaults to 800kHz when PWM/SYNC is held high, and Burst Mode is forced when the pin is pulled low.
LTC3111EDE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 14-WFDFN 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:
- 14-DFN (4x3)
LTC3111EDE#PBF FAQ
1.How can I place an order for LTC3111EDE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3111EDE#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 LTC3111EDE#PBF reliable?
The price and inventory of LTC3111EDE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3111EDE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3111EDE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3111EDE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3111EDE#PBF?
LTC3111EDE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3111EDE#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 LTC3111EDE#PBF?
For technical support, including LTC3111EDE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3111EDE#PBF requirements.
6.How does Aetrix verify that LTC3111EDE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3111EDE#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 LTC3111EDE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3111EDE#PBF?
All LTC3111EDE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3111EDE#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 LTC3111EDE#PBF part is unused and in its original packaging.
Return procedure for LTC3111EDE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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