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Analog Devices Inc. LTC3111HDE#PBF
- Part No.:
- LTC3111HDE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 14-WFDFN Exposed Pad
- Datasheet:
-
LTC3111HDE#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 14DFN
- Quantity:
- Payment:
- Shipping:
Inventory:122
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Product details
Overview
LTC3111HDE#PBF from Analog Devices (formerly Linear Technology) is a high-temperature-rated, 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 Burst Mode® operation enabling 49µA no-load quiescent current. It delivers regulated power in battery-powered RF transmitters and industrial backup systems where VIN may be above, below, or equal to VOUT.
For engineers reviewing the LTC3111HDE#PBF datasheet, LTC3111HDE#PBF pinout, LTC3111HDE#PBF application, or LTC3111HDE#PBF equivalent, key selection criteria include its –40°C to 150°C junction temperature rating, 4-switch single-inductor architecture, RUN pin programmable UVLO, internal soft-start, and output disconnect in shutdown.
Technical Context
The LTC3111HDE#PBF implements a voltage-mode controlled 4-switch buck-boost topology with seamless mode transitions-buck, buck-boost, and boost-enabled by synchronized N-channel MOSFETs (SW1/SW2, BST1/BST2) and internal gate drivers. Its error amplifier drives COMP with Type III compensation support, while the 800kHz oscillator is synchronizable from 600kHz to 1.5MHz via PWM/SYNC.
It integrates dual UVLO circuits (VIN and VCC), thermal shutdown at ~175°C, reverse current limiting (–1A), peak current limit (5.8A), and input current limit (2.3A typical). The RUN pin enables precise turn-on/turn-off thresholds (1.18V rising / 1.08V falling) with 120mV hysteresis, supporting custom undervoltage lockout in wide-input industrial systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input/Output Range | 2.5V to 15V - supports single/multi-cell Li-ion, alkaline/NiMH, supercapacitor, and wall adapter sources without external level-shifting. |
| Continuous Output Current | 1.5A at VIN ≥ 5V, VOUT = 5V, PWM mode - sufficient for powering RF PA stages or microcontroller subsystems. |
| Switching Frequency | 800kHz nominal, synchronizable 600kHz–1.5MHz - enables compact magnetics and EMI control via external clock injection. |
| 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 (90mΩ SW1, 105mΩ SW2/SW3/SW4) and selectable PWM/Burst operation. |
| Junction Temperature Range | –40°C to +150°C - qualified for under-hood automotive, military, and high-ambient industrial environments. |
| Shutdown Current | < 1µA - ensures minimal drain on backup capacitors during system sleep or fault conditions. |
Pinout & Package
The LTC3111HDE#PBF is housed in a thermally enhanced 14-lead (3mm × 4mm × 0.75mm) plastic DFN package with exposed PGND pad (Pin 15) requiring solder connection to PCB ground plane for optimal thermal performance (θJA = 43°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SGND (Pin 1) | Signal Ground Reference | Return path for RUN and FB divider networks; must be isolated from noisy PGND until star-point connection. |
| 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 overrides internal oscillator. |
| VCC (Pin 3) | Internal Regulated Bias Supply | Tracks VIN up to 4.2V, clamped thereafter; powers internal logic and gate drivers; requires 1µF ceramic bypass to SGND. |
| NC (Pin 4) | No Connect | Internally unconnected; must be tied to SGND per layout guidelines to minimize noise coupling. |
| VOUT (Pin 5) | Regulated Output Node | Delivers stable output; requires low-ESR ceramic capacitor (e.g., 22µF) placed adjacent to pin with short SGND return. |
| SW2 (Pin 6) | Switch Node 2 | Connection point for external inductor and internal switches C/D; high dv/dt node requiring tight layout and ground shielding. |
| BST2 (Pin 7) | Floating Boost Supply for D-Switch Driver | Connect 0.1µF capacitor between BST2 and SW2 to generate gate drive voltage above SW2 potential. |
| COMP (Pin 8) | Error Amplifier Output | Drives external Type III compensation network (RFB, CPOLE, RFF, CFF) to stabilize control loop across full VIN/VOUT range. |
| FB (Pin 9) | Feedback Voltage Input | Senses resistor divider (R1/R2) from VOUT; regulates output via 0.8V reference; leakage <50nA preserves accuracy. |
| SNSGND (Pin 10) | Sense Ground | Dedicated analog ground for feedback and current sense paths; must connect directly to SGND star point. |
| RUN (Pin 11) | Enable/UVLO Threshold Input | Resistive divider from VIN sets precise turn-on (1.18V) and turn-off (1.08V) thresholds; hysteresis prevents chatter near threshold. |
| 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) | Switch Node 1 | Connection point for external inductor and internal switches A/B; high dv/dt node requiring symmetric layout and ground stitching. |
| BST1 (Pin 14) | Floating Boost Supply for A-Switch Driver | Connect 0.1µF capacitor between BST1 and SW1 to generate gate drive voltage above SW1 potential. |
| PGND (Exposed Pad) | Power Ground Return | Primary thermal and current return path; must be soldered with ≥6 thermal vias to inner-layer ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| 4-Switch Single-Inductor Architecture | Enables seamless buck/boost/buck-boost transitions without output discontinuity or inductor current reversal-critical for stable power in dynamic load applications. |
| Programmable RUN Pin UVLO | Allows user-defined input undervoltage lockout using external resistive divider, ensuring reliable start-up and brown-out protection in wide-input industrial systems. |
| Output Disconnect in Shutdown | Prevents back-powering of upstream sources when disabled, protecting batteries or backup capacitors from discharge through VOUT. |
| Internal Soft-Start (2ms) | Controls inrush current during power-up, eliminating output overshoot and reducing stress on input capacitors and downstream circuitry. |
| Thermal Shutdown with Hysteresis | Disables all switches at ~175°C and auto-restarts at ~170°C, preventing permanent damage while enabling graceful recovery after transient overloads. |
Applications
| RF Transmitter Power Supply | Military & Industrial Backup Systems |
|---|---|
Use Scenario: Powering Class AB/Class E RF power amplifiers in portable radios or SATCOM terminals where input voltage varies widely (e.g., 3.3V–12V) due to battery discharge or mixed-source inputs. IC Role / Device Role / Timing Role: Synchronous buck-boost regulator maintaining stable 5V or 12V output regardless of VIN position relative to VOUT, with fast transient response to PA burst loads. Use Value: Eliminates need for separate buck and boost converters, reducing BOM count and PCB area while sustaining >90% efficiency across 0.05A–1.5A load range. | Use Scenario: Providing uninterrupted 3.3V or 5V supply to critical controllers during main power failure, using supercapacitors or backup batteries as energy source. IC Role / Device Role / Timing Role: High-efficiency, low-quiescent-current DC/DC converter that operates down to 2.5V input and maintains regulation during capacitor voltage decay. Use Value: 49µA Burst Mode quiescent current extends hold-up time; output disconnect prevents backup source self-discharge; –40°C to 150°C rating ensures reliability in harsh enclosures. |
| Multi-Cell Battery-Powered Instruments | Automotive Infotainment Subsystem |
Use Scenario: Power management for handheld test equipment using 2–3 series Li-ion cells (6V–12.6V) or alkaline stacks (3V–9V), requiring clean, regulated 3.3V for MCU and sensors. IC Role / Device Role / Timing Role: Fixed-frequency buck-boost controller delivering low-noise 3.3V output with <200mVpp ripple in PWM mode and ultra-low IQ in idle states. Use Value: Seamless mode transition avoids output glitches during battery voltage sag; internal soft-start prevents inrush into large sensor rail capacitance. | Use Scenario: Supplying 5V to USB-C PD controllers or display timing ICs in vehicle head units where input ranges from cold-crank (4.5V) to load-dump (18V). IC Role / Device Role / Timing Role: Wide-input buck-boost regulator with robust UVLO (2.1V rising) and thermal protection, operating reliably across automotive temperature extremes. Use Value: –40°C to 150°C qualification meets AEC-Q100 Grade 1 requirements; 15V absolute max rating withstands load-dump transients; PGND-exposed DFN aids thermal dissipation in confined spaces. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3115EDHD#PBF | Higher 3.5A output current, 3.6V–36V input, 2.2MHz switching, but larger 16-pin 4mm × 4mm DFN package and no Burst Mode. | Better suited for high-power industrial motor drives; lacks ultra-low IQ for battery longevity. | Select when >1.5A output or >15V input is required; avoid if thermal budget or battery runtime are primary constraints. |
| TPS63020DSJR | 2.5V–6V input, 0.4A output, 2.4MHz, integrated compensation, but only rated to 85°C ambient and no programmable RUN UVLO. | Targeted at space-constrained consumer wearables; insufficient for extended-temperature industrial use. | Choose for cost-sensitive, low-power portable designs where temperature grade and precision UVLO are not critical. |
Compared with LTC3115EDHD#PBF and TPS63020DSJR, the LTC3111HDE#PBF uniquely balances 1.5A capability, –40°C to 150°C operation, 49µA Burst Mode IQ, and programmable UVLO in a compact 3mm × 4mm DFN-making it optimal for thermally demanding, battery-backed industrial and defense applications.
Availability
LTC3111HDE#PBF is available at Aetrix Electronics and suitable for RF transmitter power supplies, military backup systems, and multi-cell battery-powered instrumentation requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LTC3111HDE#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 power management ICs with rigorous automotive, military, and industrial qualification standards.
The LTC3111HDE#PBF belongs to Linear's extended-range buck-boost converter family, designed specifically for applications where input voltage may fall above, below, or equal to the regulated output-such as battery-powered communications, backup power, and wide-input industrial systems.
FAQ
What is the maximum junction temperature rating for the LTC3111HDE#PBF?
The LTC3111HDE#PBF is specified for operation from –40°C to +150°C junction temperature, with thermal shutdown activating at approximately 175°C and automatic restart at ~170°C. This H-grade qualification makes the LTC3111HDE#PBF suitable for under-hood automotive, military, and high-ambient industrial environments where standard commercial or industrial grades would fail.
Does the LTC3111HDE#PBF support synchronization to an external clock?
Yes, the LTC3111HDE#PBF supports external clock synchronization via the PWM/SYNC pin. Applying a square wave signal between 600kHz and 1.5MHz overrides the internal 800kHz oscillator. The signal must maintain minimum high and low times of 100ns each to ensure reliable capture and release, as verified in the LTC3111HDE#PBF typical performance curves (Figure G27).
How does the RUN pin function in the LTC3111HDE#PBF?
The RUN pin on the LTC3111HDE#PBF serves dual functions: digital enable/disable (logic-high >1.18V enables, <1.08V disables) and programmable input UVLO. When biased with a resistive divider from VIN, it sets precise turn-on and turn-off thresholds-enabling customized brown-out protection without external comparators. The 120mV hysteresis prevents oscillation near threshold crossing.
What is the purpose of the BST1 and BST2 pins on the LTC3111HDE#PBF?
BST1 and BST2 are floating bootstrap supplies for the high-side N-channel MOSFET gate drivers (switches A and D). Each requires a 0.1µF ceramic capacitor connected between the BST pin and its respective switch node (SW1 for BST1, SW2 for BST2) to generate gate drive voltages above the switch node potential-ensuring full enhancement of the high-side FETs in buck and boost modes.
Can the LTC3111HDE#PBF operate with input voltage lower than its output voltage?
Yes, the LTC3111HDE#PBF is explicitly designed for seamless boost operation when VIN < VOUT (e.g., 3.3V input to 5V output), as well as buck (VIN > VOUT) and buck-boost (VIN ≈ VOUT) modes. Its 4-switch architecture and proprietary control algorithm maintain continuous inductor current and stable regulation without mode-switching artifacts or output glitches.
LTC3111HDE#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-DFN (4x3)
LTC3111HDE#PBF FAQ
1.How can I place an order for LTC3111HDE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3111HDE#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 LTC3111HDE#PBF reliable?
The price and inventory of LTC3111HDE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3111HDE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3111HDE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3111HDE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3111HDE#PBF?
LTC3111HDE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3111HDE#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 LTC3111HDE#PBF?
For technical support, including LTC3111HDE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3111HDE#PBF requirements.
6.How does Aetrix verify that LTC3111HDE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3111HDE#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 LTC3111HDE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3111HDE#PBF?
All LTC3111HDE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3111HDE#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 LTC3111HDE#PBF part is unused and in its original packaging.
Return procedure for LTC3111HDE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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