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Analog Devices Inc. LTC3111IDE#PBF
- Part No.:
- LTC3111IDE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 14-WFDFN Exposed Pad
- Datasheet:
-
LTC3111IDE#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 14DFN
- Quantity:
- Payment:
- Shipping:
Inventory:175
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Product details
Overview
LTC3111IDE#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, and selectable Burst Mode® for ultra-low quiescent current. It enables regulated power delivery in battery-powered systems where VIN may be above, below, or equal to VOUT - such as multi-cell Li-ion or alkaline/NiMH supplies powering RF transmitters.
For engineers reviewing the LTC3111IDE#PBF datasheet, LTC3111IDE#PBF pinout, LTC3111IDE#PBF application, or LTC3111IDE#PBF equivalent, key selection criteria include input/output voltage flexibility, 49µA no-load quiescent current in Burst Mode®, accurate RUN pin UVLO threshold programming, thermal shutdown behavior, and compatibility with 4.7µH inductors and ceramic output capacitors.
Technical Context
The LTC3111IDE#PBF implements a proprietary 4-switch, single-inductor architecture that enables seamless mode transitions between buck, buck-boost, and boost without inductor current discontinuity. Its voltage-mode control loop uses an internal 0.8V reference and error amplifier with external Type III compensation on the COMP pin.
It integrates low-RDS(ON) N-channel MOSFETs (90mΩ for SW1 path, 105mΩ for SW2 path), supports synchronization from 600kHz to 1.5MHz via PWM/SYNC, and features dual UVLO circuits - one for VIN (2.1V rising) and one for VCC (2.35V rising) - ensuring robust start-up under varying supply conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input/Output Range | 2.5V to 15V - supports single/multi-cell batteries, 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 power amplifiers or industrial microcontrollers. |
| Switching Frequency | 800kHz nominal, synchronizable 600kHz–1.5MHz - enables compact magnetics and EMI-controlled layout with external clock source. |
| Quiescent Current | 49µA in Burst Mode® - extends battery life in always-on sensor nodes or low-duty-cycle telemetry devices. |
| Efficiency | Up to 95% - achieved via low-RDS(ON) internal switches and optimized gate drive, critical for thermal-limited enclosures. |
| RUN Pin Threshold | 1.18V rising (±30mV) with 120mV hysteresis - allows precise, resistor-programmable input undervoltage lockout for battery end-of-life detection. |
| Shutdown Current | <1µA - ensures minimal drain during system sleep, preserving backup energy in supercapacitor hold-up applications. |
Pinout & Package
The LTC3111IDE#PBF is housed in a thermally enhanced 14-lead (3mm × 4mm × 0.75mm) plastic DFN package with exposed PGND pad (Pin 15) requiring soldering to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SGND (Pin 1) | Signal Ground Reference | Return path for feedback divider and RUN resistor network; must be isolated from noisy power ground until joined at single point. |
| PWM/SYNC (Pin 2) | Mode Control & Clock Input | DC voltage <0.5V forces Burst Mode®; >1.5V enables 800kHz PWM; 600kHz–1.5MHz square wave synchronizes switching frequency. |
| VCC (Pin 3) | Internal Bias Supply | Regulated ~4.2V supply for control circuitry; tracks VIN up to clamp voltage, supports external 5.5V source if needed. |
| NC (Pin 4) | No Connect | Internally unconnected; must be tied to SGND per datasheet to prevent floating node noise coupling. |
| VOUT (Pin 5) | Regulated Output | Delivers stable output; requires local 22µF low-ESR ceramic capacitor with short ground return path. |
| 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 SW2 Driver | Requires 0.1µF ceramic capacitor to SW2; provides gate drive voltage above SW2 potential for N-channel high-side switch D. |
| COMP (Pin 8) | Error Amplifier Output | Drives external Type III compensation network (RFF, CFF, CFB); sets loop stability and transient response. |
| FB (Pin 9) | Feedback Input | Monitors resistive divider from VOUT; regulates output using 0.8V internal reference; leakage <50nA minimizes divider error. |
| SNSGND (Pin 10) | Sense Ground | Dedicated ground for FB and RUN dividers; must connect directly to SGND to avoid sensing errors from ground bounce. |
| RUN (Pin 11) | Enable & UVLO Programming | Resistor-divider from VIN sets turn-on (1.18V) and turn-off (1.08V) thresholds; hysteresis prevents chatter near cutoff. |
| VIN (Pin 12) | Main Input Supply | Accepts 2.5V–15V; requires ≥10µF low-ESR/low-ESL ceramic bypass capacitor placed adjacent to pin with shortest possible ground path. |
| SW1 (Pin 13) | Inductor Switch Node 1 | Connects to other end of external inductor and internal switches A/B; high-current, high-frequency node demanding low-inductance routing. |
| BST1 (Pin 14) | Floating Boost Supply for SW1 Driver | Requires 0.1µF ceramic capacitor to SW1; enables gate drive for N-channel high-side switch A. |
| PGND (Exposed Pad) | Power Ground Return | Primary return for high-current switch paths; must be soldered to large PCB copper area with multiple thermal vias for heat dissipation and low impedance. |
Key Features
| Feature | Design Value |
|---|---|
| Single-inductor 4-switch topology | Eliminates need for separate buck and boost converters; reduces BOM count and board space while enabling seamless VIN/VOUT crossover. |
| Programmable RUN pin UVLO | Enables precise battery voltage monitoring and graceful shutdown before deep discharge, improving system reliability in portable equipment. |
| Output disconnect in shutdown | Prevents back-powering of input rail when disabled - essential for systems with multiple power domains or hot-swap capability. |
| Internal soft-start (2ms) | Controls inrush current during startup; maintains regulation throughout soft-start, allowing immediate load response without output overshoot. |
| Thermal shutdown with auto-restart | Disables all switches at ~175°C junction temperature and resumes operation at ~170°C, protecting against sustained overtemperature without manual reset. |
Applications
| Portable Medical Sensors | Industrial Telemetry Nodes |
|---|---|
Use Scenario: Wearable glucose monitor powered by single 3.7V Li-ion cell, requiring stable 3.3V for MCU and 5V for Bluetooth radio across full battery discharge curve (4.2V → 3.0V). IC Role / Device Role / Timing Role: Buck-boost regulator maintaining regulated outputs regardless of input sag; operates in buck mode at full charge, transitions seamlessly to buck-boost/boost as battery depletes. Use Value: Enables single-cell operation without voltage droop-induced resets; 49µA Burst Mode® current extends runtime >30% versus fixed-frequency alternatives. | Use Scenario: Remote pressure sensor in oil-field pipeline using 2xAA alkaline pack (1.8V–3.2V), powering 3.3V MCU and 12V piezoelectric transducer driver. IC Role / Device Role / Timing Role: Primary DC/DC stage generating both logic and analog supply rails; delivers 1.5A peak to drive transducer pulses while sustaining 5V logic rail. Use Value: 2.5V–15V input/output range eliminates need for pre-regulator; 95% efficiency at 500mA load minimizes thermal stress in sealed enclosure. |
| RF Power Amplifier Supply | Military Backup Power Systems |
Use Scenario: S-band transmitter module with variable supply demand: 5V/1A continuous + 12V/500mA pulsed for PA bias, fed from 12V vehicle battery with ±20% ripple. IC Role / Device Role / Timing Role: Intermediate regulator generating clean, tightly regulated 5V and 12V rails; handles input transients and load steps without dropout. Use Value: 800kHz switching frequency enables small 4.7µH inductor; low-noise PWM mode suppresses RF interference in sensitive receive bands. | Use Scenario: Ruggedized handheld radio with dual power sources: primary Li-ion (3.0V–4.2V) and backup supercapacitor (0.5V–2.7V), requiring uninterrupted 3.3V for FPGA and memory. IC Role / Device Role / Timing Role: Seamless switchover regulator maintaining VOUT during source transition; operates down to 2.5V input, supporting capacitor discharge into regulation. Use Value: Eliminates need for OR-ing diodes or discrete switchover ICs; <1µA shutdown current preserves backup energy for >72 hours. |
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 | 3.5V–12V input, 0.5A max output, 2.5MHz switching, integrated inductor option available | Lower current rating and narrower input range; better suited for space-constrained consumer wearables than industrial RF loads | Select when board area is critical and output current ≤500mA; verify thermal performance at full load in enclosed environment |
| MAX20406AATGA+ | 4V–16V input, 2A output, 2.2MHz, I²C programmable VOUT and limits, no Burst Mode® | Higher current and digital configurability; lacks ultra-low IQ mode, increasing standby power in battery-critical designs | Choose for systems requiring dynamic voltage scaling or fault reporting via I²C; avoid where sub-100µA quiescent current is mandatory |
Compared with TPS63020DSJR and MAX20406AATGA+, the LTC3111IDE#PBF offers superior input/output voltage flexibility (2.5V–15V), higher efficiency at medium loads, and industry-leading 49µA Burst Mode® current - making it optimal for wide-input battery systems needing long shelf life and robust transient response.
Availability
LTC3111IDE#PBF is available at Aetrix Electronics and suitable for portable medical sensors, industrial telemetry nodes, RF power amplifier supplies, and military backup power systems requiring stable component supply across extended temperature ranges (–40°C to 125°C).
Supply support for LTC3111IDE#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC3111IDE#PBF belongs to ADI's Power by Linear™ family of high-efficiency DC/DC converters, designed specifically for battery-powered and wide-input industrial systems requiring seamless voltage regulation across input/output crossovers.
FAQ
What is the maximum continuous output current specification for the LTC3111IDE#PBF?
The LTC3111IDE#PBF delivers 1.5A continuous output current when VIN ≥ 5V and VOUT = 5V in PWM mode. This rating assumes proper thermal design - including soldering the exposed PGND pad to a multilayer PCB with thermal vias - and operation within the –40°C to 125°C junction temperature range. At lower input voltages or higher ambient temperatures, derating applies per the die temperature rise curves in the datasheet.
How does the RUN pin on the LTC3111IDE#PBF enable programmable undervoltage lockout?
The RUN pin on the LTC3111IDE#PBF accepts a resistive divider from VIN to set custom turn-on (1.18V typical) and turn-off (1.08V typical) thresholds with 120mV built-in hysteresis. This allows precise battery voltage monitoring - for example, configuring a 3.0V Li-ion cutoff by selecting R5/R6 values per the equation VIN(RUN) = 1.2V × (1 + R5/R6). The LTC3111IDE#PBF remains fully disabled below the falling threshold, preventing brownout operation.
Can the LTC3111IDE#PBF synchronize to an external clock, and what is the supported frequency range?
Yes, the LTC3111IDE#PBF supports external synchronization via its PWM/SYNC pin across 600kHz to 1.5MHz. A clean square wave with minimum high/low time ≥100ns overrides the internal 800kHz oscillator. This capability enables EMI reduction through frequency dithering or alignment with system clocks. When not synchronized, the LTC3111IDE#PBF defaults to 800kHz ±100kHz, with typical variation of ±5% over temperature and line.
What is the quiescent current of the LTC3111IDE#PBF in Burst Mode® operation, and how is it measured?
The LTC3111IDE#PBF draws 49µA typical quiescent current in Burst Mode® operation, measured at TA = 25°C with FB = 1V and PWM/SYNC = 0V. This ultra-low IQ enables multi-year battery life in infrequently active systems like IoT sensors. The value reflects total device consumption - including bias circuits, comparators, and gate drivers in sleep state - and is validated across the full –40°C to 125°C operating range per the Electrical Characteristics table.
Does the LTC3111IDE#PBF provide output disconnect during shutdown, and how is it implemented?
Yes, the LTC3111IDE#PBF provides true output disconnect in shutdown: all internal MOSFETs are turned off, isolating VOUT from VIN and preventing reverse current flow. This is implemented via control logic that disables gate drivers and places SW1/SW2 in high-impedance state when RUN falls below 1.08V. The feature protects upstream sources - such as batteries or supercapacitors - from unintended discharge, which is critical in redundant power architectures.
LTC3111IDE#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)
LTC3111IDE#PBF FAQ
1.How can I place an order for LTC3111IDE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3111IDE#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 LTC3111IDE#PBF reliable?
The price and inventory of LTC3111IDE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3111IDE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3111IDE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3111IDE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3111IDE#PBF?
LTC3111IDE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3111IDE#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 LTC3111IDE#PBF?
For technical support, including LTC3111IDE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3111IDE#PBF requirements.
6.How does Aetrix verify that LTC3111IDE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3111IDE#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 LTC3111IDE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3111IDE#PBF?
All LTC3111IDE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3111IDE#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 LTC3111IDE#PBF part is unused and in its original packaging.
Return procedure for LTC3111IDE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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