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Analog Devices Inc. LTC3119EFE#PBF
- Part No.:
- LTC3119EFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3119EFE#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 5A 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,367
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Product details
Overview
LTC3119EFE#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 voltage ranges, proprietary 4-switch PWM architecture, and seamless operation across buck/boost/buck-boost transitions. It delivers up to 5A in buck mode (VIN > 6V), supports MPPC for solar/battery energy harvesting, and operates down to 250mV after startup - ideal for backup power supplies and wide-input battery-powered RF systems.
For engineers reviewing the LTC3119EFE#PBF datasheet, LTC3119EFE#PBF pinout, LTC3119EFE#PBF application, or LTC3119EFE#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 compatibility with 1–4-cell Li-ion, supercapacitor, and photovoltaic input sources.
Technical Context
The LTC3119EFE#PBF implements a current-mode controlled, 4-switch synchronous buck-boost topology with internal gate drivers and ultralow-noise PWM modulation. Its proprietary architecture eliminates subharmonic oscillation and ensures continuous inductor current during mode transitions - critical for stable regulation when VIN crosses VOUT.
It integrates an accurate RUN pin comparator (1.205V threshold, 90mV hysteresis), MPPC circuitry (774–822mV threshold), and dual bootstrap rails (BST1/BST2) for high-side N-channel switch drive. The device supports external synchronization via PLL up to 2MHz and features internal soft-start (6ms), power good indicator, and thermal overload protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 18V operating; sustains regulation down to 250mV after startup via VCC bootstrapping - enables full discharge of supercapacitors and multi-cell batteries. |
| Output Voltage Range | 0.8V to 18V, set by FB resistor divider - supports single-rail system supplies (e.g., 3.3V, 5V, 12V) without external LDOs. |
| Continuous Output Current | 5A in buck mode (VIN > 6V); 3A at VIN = 3.6V/VOUT = 5V - sufficient for FPGA core rails and RF PA biasing. |
| Switching Frequency | Programmable 400kHz–2MHz via RT resistor; synchronizable to external clock up to 2MHz - balances PCB area (higher fSW) vs. efficiency (lower fSW). |
| Efficiency & Quiescent Current | Up to 95% peak efficiency; 35µA no-load IQ in Burst Mode®, 3µA shutdown current - extends battery runtime in always-on IoT sensors. |
| Power Switch RDS(ON) | 30mΩ per internal N-channel switch (A/B/C/D) - minimizes conduction loss and thermal rise at 5A load. |
| MPPC Function | Configurable input voltage regulation point (774–822mV on MPPC pin) - optimizes power extraction from PV panels or weak battery sources. |
Pinout & Package
The LTC3119EFE#PBF is housed in a 28-lead plastic enhanced TSSOP package (4mm × 9.7mm) with exposed thermal pad (Pin 29 = PGND). Thermal resistance θJA = 21°C/W; exposed pad must be soldered to PCB ground plane for rated performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (Pins 4, 9, 20, 25, Exposed Pad 29) | Power Ground | Low-impedance return path for all high-current switches; exposed pad is mandatory for thermal management and EMI control. |
| VIN (Pin 19), PVIN (Pins 22, 23) | Main Input Power | VIN powers internal VCC LDO; PVIN connects to switch A - decoupling capacitor required at PVIN for transient suppression. |
| SW1 (Pins 21, 24), SW2 (Pins 5, 8) | Power Switch Nodes | Connect to opposite ends of buck-boost inductor; SW1 drives high-side switch A/B, SW2 drives low-side switch C/D. |
| PVOUT (Pins 6, 7) | Output Power | Connects to switch D output; requires ≥10µF low-ESR ceramic capacitor directly to PGND for ripple suppression. |
| FB (Pin 12), VC (Pin 13) | Feedback & Compensation | FB sets VOUT via resistor divider (795mV nominal reference); VC hosts Type-II/III compensation network for loop stability. |
| RUN (Pin 18), PWM/SYNC (Pin 28) | Enable & Mode Control | RUN enables IC and sets UVLO (1.205V threshold); PWM/SYNC selects Burst Mode® (low) or forced PWM (high), or accepts sync clock. |
| MPPC (Pin 15), BST1 (Pin 26), BST2 (Pin 3) | Special Functions | MPPC enables input MPPT; BST1/BST2 require 0.1µF ceramic caps to SW1/SW2 for gate drive bootstrapping - non-negotiable for high-side N-FET operation. |
Key Features
| Feature | Design Value |
|---|---|
| 4-Switch Synchronous Buck-Boost Topology | Enables seamless VIN-to-VOUT transitions without output glitches or mode-hopping artifacts - essential for noise-sensitive RF and data acquisition systems. |
| Burst Mode® Operation | Reduces no-load input current to 35µA while maintaining tight output regulation - extends shelf life and runtime in battery-backed memory and real-time clocks. |
| Maximum Power Point Control (MPPC) | Allows precise input voltage regulation (±12mV accuracy) from current-limited sources like solar cells - improves harvested energy by up to 30% vs. fixed-input designs. |
| Internal VCC LDO with 10mA Drive Capability | Provides regulated 3.7V supply for internal logic and can power external bias circuits (e.g., op-amps, sensors), eliminating need for auxiliary LDO. |
| Programmable Soft-Start (6ms) | Prevents inrush current and output overshoot during power-up - protects downstream loads and reduces stress on input capacitors. |
| Power Good Indicator (PGOOD) | Open-drain flag asserts when VOUT is within ±8% of target - enables safe sequencing in multi-rail systems and fault detection in mission-critical applications. |
Applications
| Solar Battery Chargers | RF Power Supplies |
|---|---|
|
Use Scenario: Photovoltaic panel charging a 12V LiFePO₄ battery bank under variable irradiance and partial shading. IC Role / Device Role / Timing Role: Buck-boost controller performing MPPT via MPPC pin and regulating constant-current/constant-voltage charge profile. Use Value: Maximizes energy harvest across wide input (0.25–18V) and maintains 94% efficiency at 3A even at 2.5V PV input - outperforms conventional boost-only chargers. |
Use Scenario: Providing clean, regulated 5V/3A bias to GaN RF power amplifier stages in portable 5G transceivers. IC Role / Device Role / Timing Role: Low-noise buck-boost regulator delivering stable rail despite fluctuating battery voltage (3.0–4.2V) and pulsed RF load demands. Use Value: Ultralow-noise PWM and <10mVpp output ripple prevent AM modulation of RF carrier - verified in LTE band testing per 3GPP TS 36.141. |
| System Backup Power Supplies | 1–4-Cell Lithium Battery Powered Products |
|
Use Scenario: Maintaining 3.3V MCU and SRAM operation during main power failure using a 5.5V supercapacitor stack. IC Role / Device Role / Timing Role: Bidirectional buck-boost converter discharging supercap from 5.5V down to 0.25V while sustaining regulated output. Use Value: Operates down to 250mV input post-startup - extracts >92% of stored supercap energy vs. 70% with conventional 2.7V cutoff converters. |
Use Scenario: Powering industrial handheld meter with 3.7V nominal Li-ion (2.8–4.2V range) to deliver 5V/2A for display and comms subsystems. IC Role / Device Role / Timing Role: Wide-input buck-boost regulator enabling single-battery operation without voltage-doubler or dual-battery packs. Use Value: Delivers full 2A at 5V across entire battery discharge curve (4.2V → 2.8V), eliminating brownouts during peak transmit bursts. |
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, spread-spectrum EMI reduction, but no MPPC or sub-250mV operation. | Preferred for automotive (12V/24V systems) with stringent CISPR-25 EMI limits; unsuitable for ultra-low-VIN energy harvesting. | Select LT8390A when input exceeds 18V or EMI compliance is primary; LTC3119EFE#PBF remains optimal for sub-3V inputs and MPPC-critical solar/battery apps. |
| TPS63020DSJR | Lower 5.5V max input, 3A output, no MPPC, higher 40µA no-load IQ, but smaller 10-pin WSON package. | Targeted at space-constrained consumer wearables; lacks thermal robustness and wide-VIN capability for industrial backup power. | Choose TPS63020 for cost-sensitive, low-power portable devices where input stays >2.5V; LTC3119EFE#PBF is superior for ruggedized, wide-input, high-current designs. |
Compared with LT8390AEMSE#PBF and TPS63020DSJR, the LTC3119EFE#PBF uniquely combines 250mV operational floor, integrated MPPC, and 5A capability in a thermally enhanced TSSOP - making it the only choice for high-efficiency, ultra-wide-input energy harvesting and backup power systems.
Availability
LTC3119EFE#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 manufacturability, and guaranteed temperature-grade availability.
Supply support for LTC3119EFE#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, serving industrial, automotive, communications, and healthcare markets.
The LTC3119 belongs to Linear's high-efficiency monolithic DC/DC converter product line, engineered specifically for wide-input, high-current applications where seamless buck-boost operation, ultra-low IQ, and energy harvesting intelligence are critical.
FAQ
What is the minimum input voltage the LTC3119EFE#PBF can regulate from after startup?
The LTC3119EFE#PBF sustains regulation down to 250mV after startup when VCC is maintained externally (e.g., bootstrapped from VOUT). This enables full utilization of supercapacitors and deeply discharged batteries. Below 250mV, the part ceases switching but retains state; re-enabling requires VIN > 2.5V or VCC restoration. This behavior is confirmed in the Electrical Characteristics table (Note 4) and Typical Performance G26/G27.
Does the LTC3119EFE#PBF support true zero-volt output capability?
Yes - the LTC3119EFE#PBF supports output voltages as low as 0.8V, and its high-side drive architecture allows operation with VOUT = 0V while maintaining current control and synchronous rectification. This is explicitly stated in the Introduction section (page 14) and enabled by the independent gate drivers for SW1 and SW2, which remain functional even when VOUT collapses.
How is Maximum Power Point Control (MPPC) implemented on the LTC3119EFE#PBF?
MPPC on the LTC3119EFE#PBF is implemented via the MPPC pin (Pin 15), which compares input voltage against an internal 795mV reference. A resistive divider from VIN to GND sets the regulation point between 774mV and 822mV (±12mV). When VIN drops below this threshold, the controller reduces input current to maintain peak power transfer - validated in Figure G28 and Applications section.
What are the thermal limitations of the LTC3119EFE#PBF in the TSSOP package?
The LTC3119EFE#PBF in the 28-lead enhanced TSSOP has θJA = 21°C/W (JEDEC JESD51-7, 2s2p copper). Junction temperature must not exceed 125°C (E-grade). Derating is required above 85°C ambient; thermal shutdown activates at TJ ≈ 160°C (Note 6). Proper PCB layout - including 1-in² 2oz copper pour under the exposed pad - is mandatory to achieve rated 5A output.
Can the LTC3119EFE#PBF be synchronized to an external clock, and what are the timing requirements?
Yes - the LTC3119EFE#PBF supports synchronization via the PWM/SYNC pin (Pin 28) using an internal PLL. The external clock must exceed the RT-set frequency; minimum pulse width is 100ns. Synchronization range is 400kHz–2MHz. This is detailed in the Electrical Characteristics table (PWM/SYNC specs) and Operation section (pages 14–15).
LTC3119EFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width) 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-TSSOP-EP
LTC3119EFE#PBF FAQ
1.How can I place an order for LTC3119EFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3119EFE#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 LTC3119EFE#PBF reliable?
The price and inventory of LTC3119EFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3119EFE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3119EFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3119EFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3119EFE#PBF?
LTC3119EFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3119EFE#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 LTC3119EFE#PBF?
For technical support, including LTC3119EFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3119EFE#PBF requirements.
6.How does Aetrix verify that LTC3119EFE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3119EFE#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 LTC3119EFE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3119EFE#PBF?
All LTC3119EFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3119EFE#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 LTC3119EFE#PBF part is unused and in its original packaging.
Return procedure for LTC3119EFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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