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Analog Devices Inc. LTC3119IUFD#PBF
- Part No.:
- LTC3119IUFD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC3119IUFD#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 5A 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,753
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Product details
Overview
LTC3119IUFD#PBF from Analog Devices is a monolithic 18V, 5A synchronous buck-boost DC/DC converter with 2.5V–18V input and 0.8V–18V output ranges, proprietary 4-switch PWM architecture, and seamless mode transitions. It delivers 5A continuous output in buck mode (VIN > 6V), supports MPPC for solar/battery harvesting, and operates down to 250mV after startup-ideal for backup power and wide-input battery systems.
For engineers reviewing the LTC3119IUFD#PBF datasheet, LTC3119IUFD#PBF pinout, LTC3119IUFD#PBF application, or LTC3119IUFD#PBF equivalent, key selection criteria include its 400kHz–2MHz programmable switching frequency, 3µA shutdown current, Burst Mode® operation (35µA no-load IQ), integrated 30mΩ N-channel switches, and thermal performance in the 4mm × 5mm QFN package.
Technical Context
The LTC3119IUFD#PBF implements a current-mode controlled, 4-switch buck-boost topology enabling continuous regulation across VIN < VOUT, VIN = VOUT, and VIN > VOUT without discontinuities. Its internal VCC LDO (3.7V nominal) powers control circuitry and supports up to 10mA external load, while the RUN pin provides accurate UVLO threshold (1.205V typ) with 90mV hysteresis.
Maximum Power Point Control (MPPC) is implemented via a dedicated pin (MPPC) with 798mV threshold, enabling direct photovoltaic or supercapacitor input regulation. The device integrates soft-start (6ms), power-good indicator (PGOOD), and internal PLL for synchronization to external clocks up to 2MHz-ensuring low-noise operation in RF-sensitive applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 18V operating; sustains operation down to 250mV after startup when VCC is bootstrapped |
| Output Voltage Range | 0.8V to 18V, set by FB resistor divider with 795mV feedback reference |
| Continuous Output Current | 5A in buck mode (VIN > 6V); 3A at VIN = 3.6V / VOUT = 5V |
| Switching Frequency | 400kHz to 2MHz, programmable via RT pin resistor or synchronizable via PWM/SYNC pin |
| Quiescent Current | 35µA in Burst Mode® no-load; 3µA in shutdown |
| Power Switch RDS(ON) | 30mΩ per switch (PVIN→SW1, SW1→PGND, SW2→PGND, SW2→PVOUT) |
| MPPC Threshold | 798mV ±24mV, enabling precise input voltage regulation for energy-harvesting sources |
Pinout & Package
The LTC3119IUFD#PBF is housed in a thermally enhanced 28-lead 4mm × 5mm plastic QFN package (UFD) with exposed pad (Pin 29) soldered to PGND for optimal thermal performance (θJA = 22°C/W). Pin functions are validated per Linear Technology (now Analog Devices) datasheet revision 3119fb.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (Pins 1,6,17,22,29) | Power Ground | Low-impedance return path for high-current switches; exposed pad must be soldered to PCB ground plane |
| SW1 (Pins 18,21) | Buck-Boost Switch Node A | Connects to one side of inductor; drives high-side switch in buck mode and low-side in boost mode |
| SW2 (Pins 2,5) | Buck-Boost Switch Node D | Connects to same inductor node as SW1; drives low-side switch in buck mode and high-side in boost mode |
| PVIN (Pins 19,20) | Main Input Power Rail | Connects to switch A input; requires ≥10µF low-ESR capacitor to PGND |
| PVOUT (Pins 3,4) | Main Output Power Rail | Connects to switch D output; requires ≥10µF low-ESR capacitor to PGND |
| FB (Pin 9) | Voltage Feedback Input | Sets output voltage via resistor divider; 795mV reference enables 0.8–18V programming |
| RT (Pin 14) | Oscillator Frequency Set | Resistor to GND programs switching frequency from 400kHz to 2MHz |
| RUN (Pin 15) | Enable & UVLO Control | Logic enable input with 1.205V rising threshold; supports custom UVLO via resistor divider |
| MPPC (Pin 12) | Max Power Point Setpoint | 798mV threshold enables input voltage regulation for PV/supercapacitor sources |
| PWM/SYNC (Pin 25) | Mode Control & Sync Input | High = forced PWM; low = Burst Mode®; external clock sync up to 2MHz with ≥100ns pulse width |
| PGOOD (Pin 7) | Power-Good Indicator | Open-drain output asserting when FB deviates >8% from regulation; requires external pull-up |
| VCC (Pin 13) | Internal Regulator Output | 3.7V LDO output powering internal circuits; supports ≤10mA external load; requires 4.7µF capacitor |
| BST1/BST2 (Pins 23,28) | Bootstrap Rails | Each connects via 0.1µF capacitor to respective SW pin to generate gate drive voltage for N-channel switches |
Key Features
| Feature | Design Value |
|---|---|
| Seamless Buck-Boost Transition | Proprietary 4-switch PWM eliminates output transients and subharmonics during VIN/VOUT crossover |
| Ultralow-Noise PWM Operation | Minimizes EMI in RF-sensitive applications without sacrificing efficiency or regulation accuracy |
| Maximum Power Point Control (MPPC) | Enables direct input voltage regulation from photovoltaic panels or supercapacitors without external controllers |
| Programmable Frequency & Sync | Single RT resistor sets 400kHz–2MHz range; internal PLL allows noise-immune synchronization to external clocks |
| Thermal-Enhanced QFN Package | 28-lead 4mm × 5mm QFN with exposed PGND pad achieves θJA = 22°C/W for 5A continuous operation |
| Accurate Run Comparator | 1.205V ±35mV threshold with 90mV hysteresis enables precise, stable input UVLO for battery cutoff |
Applications
| Solar Battery Chargers | System Backup Power Supplies |
|---|---|
Use Scenario: Photovoltaic panel charging a Li-ion battery bank under variable irradiance. IC Role / Device Role / Timing Role: Buck-boost regulator implementing MPPC to extract maximum power from PV array while regulating battery charge voltage. Use Value: 798mV MPPC threshold enables precise input voltage regulation; 250mV minimum operating VIN maximizes energy harvest from low-light conditions. | Use Scenario: Supercapacitor-based backup supply maintaining 5V rail during AC mains failure in industrial PLCs. IC Role / Device Role / Timing Role: Wide-input buck-boost converter sustaining regulated output as supercapacitor discharges from 12V to 0.25V. Use Value: Seamless VIN < VOUT operation down to 250mV after startup ensures full utilization of stored energy; 3µA shutdown current minimizes self-discharge. |
| RF Power Supplies | 1- to 4-Cell Lithium Battery Powered Products |
Use Scenario: Low-noise 3.3V supply for cellular IoT modem operating from 2S Li-ion battery (6–8.4V). IC Role / Device Role / Timing Role: Fixed-frequency PWM-mode buck-boost delivering clean, ripple-free power with synchronized switching to avoid RF band interference. Use Value: Programmable 400kHz–2MHz frequency and PLL sync allow placement of switching harmonics outside critical RF bands; ultralow-noise PWM reduces conducted EMI. | Use Scenario: Portable medical monitor powered by single-cell Li-ion (3.0–4.2V) requiring stable 5V USB output. IC Role / Device Role / Timing Role: High-efficiency buck-boost converter delivering 3A at 5V from 3.6V input, with Burst Mode® extending runtime at standby. Use Value: 35µA no-load IQ in Burst Mode® extends battery life; 30mΩ internal switches minimize conduction loss across full input range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8390AEMSE#PBF | Higher 60V input rating, 4A output, requires external MOSFETs; no integrated MPPC | Better suited for 24V+ industrial inputs; lacks native solar MPPT capability | Select when input exceeds 18V or MPPC is unnecessary; expect larger solution size due to external FETs |
| TPS63060DSCR | Lower 5.5V max input, 3A output, fixed 2.5MHz frequency, no MPPC or sync capability | Targeted at compact consumer electronics with narrow input range; no solar or sync support | Select for cost-sensitive, space-constrained designs below 5.5V input where advanced features are not required |
Compared with LT8390AEMSE#PBF and TPS63060DSCR, the LTC3119IUFD#PBF uniquely combines 18V input, 5A output, integrated MPPC, and 400kHz–2MHz programmability in a single monolithic QFN-making it optimal for energy-harvesting and wide-input industrial backup systems where feature integration and thermal efficiency are critical.
Availability
LTC3119IUFD#PBF is available at Aetrix Electronics and suitable for solar battery chargers, system backup power supplies, RF power supplies, and 1- to 4-cell lithium battery powered products requiring stable component supply, long-term lifecycle support, and guaranteed temperature-grade performance.
Supply support for LTC3119IUFD#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 (formerly Linear Technology) is a global leader in high-performance analog, mixed-signal, and power management ICs, serving precision instrumentation, industrial automation, communications, and automotive markets.
The LTC3119IUFD#PBF belongs to Analog Devices' high-efficiency monolithic DC/DC converter product line, designed specifically for wide-input, high-current buck-boost applications in energy harvesting, backup power, and battery-powered systems demanding seamless mode transition and ultra-low quiescent current.
FAQ
What is the minimum input voltage for continuous operation of the LTC3119IUFD#PBF?
The LTC3119IUFD#PBF operates continuously down to 250mV after startup when the VCC rail is externally bootstrapped-enabling full discharge of supercapacitors or depleted batteries. During initial startup, however, the minimum input is 2.5V to meet VCC UVLO requirements. This dual-threshold behavior is enabled by the internal VCC LDO and RUN pin comparator architecture.
How does the MPPC function work on the LTC3119IUFD#PBF?
The MPPC pin on the LTC3119IUFD#PBF monitors input voltage via an external resistive divider and compares it to a precise 798mV internal reference. When the divided input falls below this threshold, the controller adjusts duty cycle to maintain constant input voltage-ideal for maximizing power extraction from photovoltaic arrays or supercapacitors. Tying MPPC to VCC disables the function.
Can the LTC3119IUFD#PBF synchronize to an external clock, and what are the timing requirements?
Yes, the LTC3119IUFD#PBF can synchronize to an external clock applied to the PWM/SYNC pin using its internal PLL. The external clock must exceed the RT-programmed frequency, with minimum pulse width of 100ns. Synchronization is supported up to 2MHz and eliminates beat frequencies in noise-sensitive RF or audio systems.
What thermal considerations apply to the LTC3119IUFD#PBF in 5A operation?
In continuous 5A operation, the LTC3119IUFD#PBF requires the exposed PGND pad (Pin 29) to be soldered to a minimum 250mm² copper area on the PCB for thermal relief. With θJA = 22°C/W, junction temperature rise is ~110°C at full load-so derating or airflow is recommended above 70°C ambient. Thermal shutdown activates at TJ = 125°C.
Does the LTC3119IUFD#PBF support both Burst Mode® and forced PWM operation?
Yes, the LTC3119IUFD#PBF supports both modes: pulling PWM/SYNC low enables automatic Burst Mode® at light loads (35µA IQ), while pulling it high forces fixed-frequency PWM operation across all loads. This dual-mode capability optimizes efficiency across the full load range-especially critical in battery-powered applications with dynamic load profiles.
LTC3119IUFD#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)
LTC3119IUFD#PBF FAQ
1.How can I place an order for LTC3119IUFD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3119IUFD#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 LTC3119IUFD#PBF reliable?
The price and inventory of LTC3119IUFD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3119IUFD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3119IUFD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3119IUFD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3119IUFD#PBF?
LTC3119IUFD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3119IUFD#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 LTC3119IUFD#PBF?
For technical support, including LTC3119IUFD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3119IUFD#PBF requirements.
6.How does Aetrix verify that LTC3119IUFD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3119IUFD#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 LTC3119IUFD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3119IUFD#PBF?
All LTC3119IUFD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3119IUFD#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 LTC3119IUFD#PBF part is unused and in its original packaging.
Return procedure for LTC3119IUFD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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