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Analog Devices Inc. LTC3119EUFD#PBF
- Part No.:
- LTC3119EUFD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC3119EUFD#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 5A 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:696
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Product details
Overview
LTC3119EUFD#PBF from Analog Devices is a monolithic 18V, 5A synchronous buck-boost DC/DC converter with 4-switch PWM architecture. It delivers up to 5A output current in buck mode (VIN > 6V), supports 2.5V–18V input and 0.8V–18V output ranges, operates down to 250mV after startup, and integrates MPPC for photovoltaic/supercapacitor energy harvesting in portable RF power supplies.
For engineers reviewing the LTC3119EUFD#PBF datasheet, LTC3119EUFD#PBF pinout, LTC3119EUFD#PBF application, or LTC3119EUFD#PBF equivalent, key selection criteria include seamless buck-boost transition, programmable 400kHz–2MHz switching frequency, Burst Mode® operation (35µA no-load IQ), integrated 30mΩ N-channel switches, and maximum power point control for current-limited sources.
Technical Context
The LTC3119EUFD#PBF employs a proprietary 4-switch current-mode PWM architecture enabling continuous conduction across VIN < VOUT, VIN = VOUT, and VIN > VOUT without mode-transition transients. Its internal oscillator-programmable via RT pin resistor or synchronizable via PWM/SYNC pin-supports 400kHz–2MHz operation with PLL-based external clock locking.
It integrates an accurate RUN pin comparator (1.205V threshold, 90mV hysteresis), MPPC circuitry (798mV setpoint), power-good indicator with –8% FB threshold, and VCC LDO (3.7V typical, 180mA limit) that powers internal control logic and supports ≤10mA external loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 18V; enables direct use with 1–4-cell Li-ion stacks, lead-acid, or backup capacitors. |
| Output Current | 5A continuous in buck mode (VIN > 6V); supports high-power RF PA biasing and system backup rails. |
| Switching Frequency | 400kHz to 2MHz; adjustable via RT pin resistor or synchronized externally for EMI-sensitive designs. |
| Quiescent Current | 35µA in Burst Mode® at no load; extends battery life in always-on IoT sensors and portable medical devices. |
| Power Switch RDS(ON) | 30mΩ per switch (A/B/C/D); minimizes conduction loss and thermal rise in compact 4mm × 5mm QFN layout. |
| MPPC Threshold | 798mV (typical); enables precise input voltage regulation for solar chargers and supercapacitor harvesters. |
| Feedback Accuracy | ±1% over temperature; ensures stable 0.8V–18V output regulation across industrial temperature range. |
Pinout & Package
The LTC3119EUFD#PBF is housed in a thermally enhanced 28-lead 4mm × 5mm plastic QFN package with exposed PGND pad (Pin 29) requiring soldering to PCB ground plane for optimal thermal performance (θJA = 22°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (Pins 1,6,17,22,29) | Power Ground | Low-impedance return path for all power switches; exposed pad must be soldered to PCB ground plane. |
| SW1 (Pins 18,21) | Buck-Boost Power Switch A/B Node | Connects to one side of inductor; drives high-side buck and low-side boost paths. |
| SW2 (Pins 2,5) | Buck-Boost Power Switch C/D Node | Connects to opposite side of inductor; enables bidirectional energy transfer in 4-switch topology. |
| PVIN (Pins 19,20) | Main Input Power Rail | High-current input connection to switch A; requires ≥10µF low-ESR capacitor to PGND. |
| PVOUT (Pins 3,4) | Main Output Power Rail | High-current output connection to switch D; requires ≥10µF low-ESR capacitor to PGND. |
| FB (Pin 9) | Voltage Feedback Input | Sets regulated output via resistor divider; 795mV reference enables 0.8V–18V programmable VOUT. |
| RT (Pin 14) | Oscillator Frequency Programming | Resistor to GND sets switching frequency from 400kHz to 2MHz; enables size/efficiency tradeoff. |
| RUN (Pin 15) | Enable & UVLO Control | 1.205V threshold enables IC; external resistor divider sets custom input undervoltage lockout. |
| MPPC (Pin 12) | Maximum Power Point Control | 798mV threshold regulates input voltage for photovoltaic or supercapacitor sources. |
| PWM/SYNC (Pin 25) | Mode Control & Clock Sync | High = fixed-frequency PWM; low = Burst Mode®; external clock sync up to 2MHz with 100ns min pulse width. |
Key Features
| Feature | Design Value |
|---|---|
| Seamless Buck-Boost Transition | Proprietary 4-switch PWM eliminates output transients during VIN/VOUT crossover, critical for stable RF supply rails. |
| Ultralow-Noise PWM Algorithm | Suppresses subharmonics and maintains loop stability across all operating modes, reducing EMI filter requirements. |
| Integrated VCC LDO | 3.7V/180mA regulator powers internal circuitry and supports ≤10mA external loads, eliminating need for auxiliary bias rail. |
| Burst Mode® Operation | 35µA no-load IQ extends runtime in battery-powered applications while automatically transitioning to PWM above ~400mA load. |
| Thermal & Short-Circuit Protection | Internal overtemperature shutdown and output short-circuit protection ensure robust operation in unattended systems. |
Applications
| Solar Battery Chargers | RF Power Supplies |
|---|---|
Use Scenario: Photovoltaic panel charging a 12V LiFePO₄ battery bank under variable irradiance. IC Role / Device Role / Timing Role: Buck-boost controller with Maximum Power Point Control (MPPC) regulating input voltage to extract peak power from PV array. Use Value: 798mV MPPC threshold enables precise input regulation; 2.5V–18V input range accommodates partial shading and cold-start conditions. | Use Scenario: Powering 5G mmWave power amplifiers requiring stable 5V/3A from a 3.6V lithium polymer battery. IC Role / Device Role / Timing Role: High-efficiency buck-boost converter maintaining constant output during battery discharge from 4.2V to 3.0V. Use Value: 5A capability in buck mode (VIN > 6V) and 3A at VIN = 3.6V/5V output ensures headroom for PA burst currents without brownout. |
| System Backup Power Supplies | Lead Acid to 12V Regulator |
Use Scenario: Supercapacitor-based backup for industrial PLC I/O modules during AC mains failure. IC Role / Device Role / Timing Role: Bidirectional buck-boost managing energy flow from 2.7V supercapacitor stack to 5V/3.3V system rails. Use Value: Operation down to 250mV after startup maximizes usable supercapacitor energy; 30mΩ switches minimize voltage drop during high-current backup pulses. | Use Scenario: Converting unregulated 9V–15V automotive lead-acid battery output to clean 12V for infotainment head units. IC Role / Device Role / Timing Role: Wide-input buck-boost regulator compensating for engine cranking dips and alternator overvoltage spikes. Use Value: 18V absolute max rating and 2.5V–18V operational range tolerate load-dump transients; PGOOD signal enables graceful system shutdown. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2918GL-Z | 4A output, 2.5V–16V input, fixed 500kHz/1MHz switching, no MPPC or programmable frequency. | Lacks maximum power point control and external frequency programming; suitable only for fixed-rail, non-harvesting applications. | Select when MPPC and wide frequency tuning are unnecessary and cost sensitivity outweighs feature flexibility. |
| TPS63020DSJR | 3A output, 2.5V–6V input, 2.5V–6V output, integrated compensation, no RT pin or MPPC. | Lower voltage range limits use to single-cell Li-ion; lacks input regulation and external sync capability. | Prefer for space-constrained consumer wearables where 3A and 2.5V–6V range suffice and BOM count reduction is critical. |
Compared with MP2918GL-Z and TPS63020DSJR, the LTC3119EUFD#PBF uniquely combines 5A output, 2.5V–18V input, programmable 400kHz–2MHz frequency, and MPPC-making it the only option for high-power energy harvesting and wide-range industrial backup systems.
Availability
LTC3119EUFD#PBF is available at Aetrix Electronics and suitable for solar battery chargers, RF power supplies, and system backup power supplies requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC3119EUFD#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC3119EUFD#PBF belongs to Linear's high-efficiency monolithic DC/DC converter product line, designed specifically for demanding applications requiring seamless buck-boost operation, ultra-low-noise switching, and intelligent input source management.
FAQ
What is the minimum input voltage required for startup of the LTC3119EUFD#PBF?
The LTC3119EUFD#PBF requires a minimum input voltage of 2.5V to initiate startup, as governed by the VCC undervoltage lockout threshold. However, once started, it can continue operating with input voltages as low as 250mV if VCC is maintained externally-enabling full energy extraction from supercapacitors and depleted batteries. This behavior is confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables of the official datasheet.
Does the LTC3119EUFD#PBF support synchronization to an external clock, and what are the timing constraints?
Yes, the LTC3119EUFD#PBF supports external clock synchronization via the PWM/SYNC pin. The internal PLL can lock to external clocks up to 2MHz, but the RT pin must be configured for a lower base frequency than the sync clock to allow margin for oscillator and clock tolerance. Minimum pulse width is 100ns, and the PLL only increases internal frequency-never decreases it-so proper RT resistor selection is essential for reliable sync operation.
How does the Maximum Power Point Control (MPPC) function in the LTC3119EUFD#PBF, and what is its setpoint voltage?
The MPPC function in the LTC3119EUFD#PBF regulates the input voltage to maximize power extraction from current-limited sources like photovoltaic panels or supercapacitors. It compares the MPPC pin voltage against an internal 798mV (typical) reference; connecting a resistor divider from VIN to GND sets the regulated input voltage. When enabled, the converter adjusts duty cycle to hold VIN at the programmed level, directly optimizing power transfer efficiency.
What is the thermal performance of the LTC3119EUFD#PBF in its 4mm × 5mm QFN package, and how should the exposed pad be handled?
The LTC3119EUFD#PBF in the UFD package has a junction-to-ambient thermal resistance (θJA) of 22°C/W. To achieve this rating, the exposed pad (Pin 29) must be soldered to the PCB ground plane using multiple thermal vias. Failure to do so degrades thermal performance significantly-potentially causing premature thermal shutdown under 5A load. The datasheet explicitly states the exposed pad is PGND and must be electrically and thermally connected to the PCB ground plane.
Can the LTC3119EUFD#PBF operate in both Burst Mode® and forced PWM mode, and how is mode selection controlled?
Yes, the LTC3119EUFD#PBF supports both modes. Holding the PWM/SYNC pin high forces fixed-frequency PWM operation at all loads, minimizing output ripple and EMI. Pulling it low enables automatic Burst Mode® at light loads (≤400mA typical), reducing no-load IQ to 35µA. The IC transitions seamlessly between modes based on load current-no external control logic is needed. This dual-mode capability is intrinsic to the device's control architecture and verified in Typical Performance Characteristics Figures G29–G37.
LTC3119EUFD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-WFQFN 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):
- 18V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 18V
- Current - Output:
- 5A
- Frequency - Switching:
- 400kHz ~ 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-QFN (4x5)
LTC3119EUFD#PBF FAQ
1.How can I place an order for LTC3119EUFD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3119EUFD#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 LTC3119EUFD#PBF reliable?
The price and inventory of LTC3119EUFD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3119EUFD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3119EUFD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3119EUFD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3119EUFD#PBF?
LTC3119EUFD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3119EUFD#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 LTC3119EUFD#PBF?
For technical support, including LTC3119EUFD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3119EUFD#PBF requirements.
6.How does Aetrix verify that LTC3119EUFD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3119EUFD#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 LTC3119EUFD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3119EUFD#PBF?
All LTC3119EUFD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3119EUFD#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 LTC3119EUFD#PBF part is unused and in its original packaging.
Return procedure for LTC3119EUFD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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