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Analog Devices Inc. LTC3119EUFD#TRPBF
- Part No.:
- LTC3119EUFD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC3119EUFD#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 5A 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:6,812
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Product details
Overview
LTC3119EUFD#TRPBF from Analog Devices is a monolithic 18V, 5A synchronous buck-boost DC/DC converter with 2.5V–18V input and 0.8V–18V output voltage ranges, proprietary 4-switch PWM architecture, 400kHz–2MHz programmable switching frequency, and maximum power point control (MPPC) for photovoltaic or supercapacitor energy harvesting applications.
For engineers reviewing the LTC3119EUFD#TRPBF datasheet, LTC3119EUFD#TRPBF pinout, LTC3119EUFD#TRPBF application, or LTC3119EUFD#TRPBF equivalent, key selection criteria include seamless buck-boost mode transition, ultralow-noise PWM operation, <250mV minimum operating input after startup, 3µA shutdown current, and thermal performance in the 4mm × 5mm QFN package with exposed PGND pad.
Technical Context
The LTC3119EUFD#TRPBF implements a current-mode controlled, 4-switch synchronous buck-boost topology enabling continuous regulation across VIN = VOUT, VIN < VOUT, and VIN > VOUT conditions without discontinuities in inductor current or loop transfer function. Its internal VCC LDO (3.7V nominal, 180mA limit) powers gate drivers and control circuitry, while BST1/BST2 bootstrap rails support high-side N-channel MOSFET drive.
Operation includes Burst Mode® for sub-35µA no-load IQ, MPPC via resistive divider on MPPC pin (798mV threshold), accurate RUN comparator (1.205V rising threshold, 90mV hysteresis), and PLL-based synchronization up to 2MHz. The device supports external RT resistor programming and maintains regulation down to VIN = 250mV after startup when VCC is bootstrapped.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 18V continuous; operates down to 250mV after startup with VCC bootstrapping - enables full discharge of supercapacitors and multi-cell batteries. |
| Output Voltage Range | 0.8V to 18V programmable via FB resistor divider - supports wide-rail system supplies including 3.3V, 5V, and 12V loads. |
| Max Output Current | 5A in buck mode (VIN > 6V); 3A at VIN = 3.6V/VOUT = 5V - defined by internal 8A current limit and thermal limits in QFN package. |
| Switching Frequency | 400kHz to 2MHz, set by RT resistor or synchronized externally - balances PCB area (higher fSW) vs. efficiency (lower fSW). |
| Quiescent Current | 35µA in Burst Mode® no-load; 3µA in shutdown - extends battery life in always-on or low-duty-cycle systems. |
| Power Switch RDS(ON) | 30mΩ per switch (PVIN→SW1, SW1→PGND, SW2→PGND, SW2→PVOUT) - minimizes conduction loss and thermal rise at 5A. |
| MPPC Threshold | 798mV ±24mV - enables precise input voltage regulation for solar chargers or capacitor backup systems. |
Pinout & Package
Package: 28-lead 4mm × 5mm plastic QFN with exposed PGND pad (Pin 29), rated for –40°C to +125°C junction temperature. Thermal resistance θJA = 22°C/W; exposed pad must be soldered to PCB ground plane for rated performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (Pins 1, 6, 17, 22, Exposed Pad 29) | Power Ground Return | Low-impedance return path for all high-current switches; exposed pad is mandatory for thermal and electrical performance. |
| SW1 (Pins 18, 21) | Buck-Boost Power Switch Node A | Connects to one side of inductor; drives current from PVIN to PGND in buck mode or from PVIN to SW2 in boost mode. |
| SW2 (Pins 2, 5) | Buck-Boost Power Switch Node D | Connects to same inductor node as SW1; drives current from SW2 to PVOUT in boost mode or from SW2 to PGND in buck mode. |
| PVIN (Pins 19, 20) | Main Input Power Rail | High-current input connection to switch A; requires ≥10µF low-ESR ceramic capacitor to PGND. |
| PVOUT (Pins 3, 4) | Main Output Power Rail | High-current output connection to switch D; requires ≥10µF low-ESR ceramic capacitor to PGND. |
| FB (Pin 9) | Feedback Voltage Input | Sets regulated output via resistor divider; 795mV nominal reference enables precise VOUT programming. |
| RT (Pin 14) | Oscillator Frequency Programming | Resistor to GND sets switching frequency from 400kHz to 2MHz; enables optimization for size or efficiency. |
| RUN (Pin 15) | Enable & UVLO Control Input | Enables IC above 1.205V; hysteresis prevents chatter; external divider sets custom input undervoltage lockout. |
| MPPC (Pin 12) | Maximum Power Point Control Input | 798mV threshold enables input voltage regulation for solar panels or supercapacitors; tie to VCC to disable. |
| PWM/SYNC (Pin 25) | Mode Control & Clock Sync | High = forced PWM; low = Burst Mode®; external clock sync up to 2MHz with ≥100ns pulse width. |
| BST1 (Pin 23) | SW1 Gate Drive Bootstrap | 0.1µF capacitor to SW1 generates high-side gate drive rail for switch A; critical for buck operation. |
| BST2 (Pin 28) | SW2 Gate Drive Bootstrap | 0.1µF capacitor to SW2 generates high-side gate drive rail for switch D; critical for boost operation. |
| VCC (Pin 13) | Internal Regulator Output | 3.7V ±150mV, 180mA max; powers internal circuitry and can supply ≤10mA external loads. |
| PGOOD (Pin 7) | Power Good Indicator | Open-drain output asserting when FB is within ±8% of target; requires external pull-up for system monitoring. |
Key Features
| Feature | Design Value |
|---|---|
| Seamless Buck-Boost Transition | Proprietary 4-switch PWM eliminates output transients and subharmonics when crossing VIN = VOUT - ensures stable rail for RF and precision analog circuits. |
| Ultralow-Noise PWM Algorithm | Minimizes conducted EMI and output ripple without requiring additional filtering - reduces BOM cost and board space in noise-sensitive applications. |
| Maximum Power Point Control (MPPC) | 798mV input regulation threshold enables optimal energy extraction from photovoltaic cells or supercapacitors - improves charging efficiency by up to 25% in solar harvesters. |
| 250mV Minimum Operating Input | Supports full discharge of single-cell Li-ion (2.5V–4.2V), 3-cell NiMH (2.7V–4.5V), or 10F+ supercapacitors - extends runtime in backup power systems. |
| Thermally Enhanced QFN Package | 4mm × 5mm footprint with exposed PGND pad achieves θJA = 22°C/W - sustains 5A continuous output at ambient ≤65°C without forced air. |
Applications
| RF Power Supply | Solar Battery Charger |
|---|---|
Use Scenario: Providing stable 5V/3.3V rail to cellular IoT modems or mmWave transceivers operating from variable-input sources like USB-C PD or battery packs. IC Role / Device Role / Timing Role: Primary non-inverting buck-boost regulator delivering regulated output independent of input sag or surge during transmit bursts. Use Value: Seamless mode transition prevents RF carrier dropout; 35µA Burst Mode IQ extends sleep-cycle battery life; 5A capability supports peak transmit currents. | Use Scenario: Charging 12V lead-acid or LiFePO₄ batteries from 12–24V photovoltaic panels under partial shading or low-light conditions. IC Role / Device Role / Timing Role: Input-regulated buck-boost converter implementing MPPT via MPPC pin to maximize harvested power at varying irradiance. Use Value: 798mV MPPC threshold enables precise panel voltage tracking; 2.5V–18V input accommodates 2–4 series solar cells; 30mΩ switches minimize conversion loss. |
| System Backup Power Supply | Wide-Input Industrial Sensor Node |
Use Scenario: Maintaining 3.3V logic supply during main power failure using supercapacitor bank (e.g., 10F, 5.5V) as energy source. IC Role / Device Role / Timing Role: Bidirectional-capable buck-boost controller that starts from 250mV and regulates output while discharging capacitor to near-zero voltage. Use Value: Enables >95% usable capacitor energy extraction; 3µA shutdown current preserves charge during standby; QFN thermal design supports continuous 2A backup load. | Use Scenario: Powering isolated industrial sensors (e.g., 4–20mA transmitters, RS-485 nodes) from unregulated 9–36V DC rails in factory automation equipment. IC Role / Device Role / Timing Role: Wide-input primary DC/DC regulator converting variable field power into stable 3.3V or 5V for microcontroller and signal conditioning circuitry. Use Value: 2.5V–18V input range covers brownout and surge conditions; 400kHz–2MHz fSW allows EMI filtering compliance; PGOOD enables system-level fault reporting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8390AEMSE#TRPBF | Higher 60V input rating, 4A output, spread-spectrum EMI reduction, but no MPPC or sub-250mV operation. | Better suited for automotive 12V/24V systems with high-voltage transients; lacks supercapacitor deep-discharge capability. | Select LT8390A when input may exceed 18V or EMI compliance is critical; avoid when MPPC or ultra-low VIN operation is required. |
| TPS63020DSJR | Lower 5.5V max input, 3A output, integrated compensation, but no RT programming, no MPPC, and no sub-2.5V operation. | Optimized for compact portable devices (e.g., wearables) with single-cell Li-ion inputs; not suitable for solar or backup power. | Select TPS63020 for cost-sensitive, space-constrained consumer designs with ≤5.5V input; avoid for industrial or energy-harvesting use cases. |
Compared with LT8390A and TPS63020, the LTC3119EUFD#TRPBF uniquely combines 18V input, 5A output, MPPC, and 250mV minimum VIN - making it the only choice for high-current solar chargers and supercapacitor backup systems requiring full energy extraction.
Availability
LTC3119EUFD#TRPBF is available at Aetrix Electronics and suitable for RF power supplies, solar battery chargers, and system backup power supplies requiring stable component supply, long-lifecycle availability, and guaranteed parametric performance over –40°C to +125°C.
Supply support for LTC3119EUFD#TRPBF 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. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3119EUFD#TRPBF belongs to Analog Devices' Power by Linear™ buck-boost converter family, designed specifically for high-efficiency, wide-input industrial and energy-harvesting applications where seamless voltage regulation across VIN/VOUT crossover is essential.
FAQ
What is the minimum input voltage at which LTC3119EUFD#TRPBF can operate after startup?
The LTC3119EUFD#TRPBF can operate down to 250mV input voltage after startup when the VCC pin is bootstrapped from the output or another auxiliary supply. This capability enables full energy extraction from supercapacitors and deeply discharged batteries. Below 2.5V, normal operation requires external VCC biasing - the 250mV limit is not applicable during initial startup.
Does LTC3119EUFD#TRPBF support synchronization to an external clock?
Yes, the LTC3119EUFD#TRPBF supports external clock synchronization via the PWM/SYNC pin, accepting input clocks from 400kHz to 2MHz with minimum pulse width of 100ns. An internal PLL locks to the external clock, allowing noise-sensitive systems to eliminate beat frequencies and meet strict EMI requirements without sacrificing regulation performance.
How is Maximum Power Point Control (MPPC) implemented on LTC3119EUFD#TRPBF?
The LTC3119EUFD#TRPBF implements MPPC using the MPPC pin, which compares input voltage against a 798mV internal reference. A resistive divider from VIN to GND sets the desired input regulation point - for example, a 12V solar panel's MPP at 18V is tracked by scaling 18V down to 798mV. When enabled, the converter regulates VIN rather than VOUT, maximizing harvested power from current-limited sources.
What is the thermal performance of LTC3119EUFD#TRPBF in its QFN package?
The LTC3119EUFD#TRPBF in the 4mm × 5mm QFN package has a junction-to-ambient thermal resistance (θJA) of 22°C/W when the exposed PGND pad is properly soldered to a 4-layer PCB with ≥2 in² copper pour. At 5A output and 12V input/5V output, typical temperature rise is ~45°C above ambient - enabling full-rated operation at 65°C ambient without forced airflow.
Can LTC3119EUFD#TRPBF be used in both buck and boost configurations exclusively?
Yes, the LTC3119EUFD#TRPBF can be configured for dedicated buck-only or boost-only operation by fixing the output voltage outside the input range - e.g., VOUT = 3.3V with VIN ≥ 4.5V forces buck mode, while VOUT = 12V with VIN ≤ 9V forces boost mode. In both cases, the 4-switch architecture remains active, preserving low-noise operation and high efficiency without mode-hopping artifacts.
LTC3119EUFD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LTC3119EUFD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3119EUFD#TRPBF 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#TRPBF reliable?
The price and inventory of LTC3119EUFD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3119EUFD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3119EUFD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3119EUFD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3119EUFD#TRPBF?
LTC3119EUFD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3119EUFD#TRPBF 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#TRPBF?
For technical support, including LTC3119EUFD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3119EUFD#TRPBF requirements.
6.How does Aetrix verify that LTC3119EUFD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3119EUFD#TRPBF 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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3119EUFD#TRPBF?
All LTC3119EUFD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3119EUFD#TRPBF, 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#TRPBF part is unused and in its original packaging.
Return procedure for LTC3119EUFD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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