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Analog Devices Inc. LTC3119IFE#TRPBF
- Part No.:
- LTC3119IFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3119IFE#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 5A 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,205
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Product details
Overview
LTC3119IFE#TRPBF from Analog Devices is a monolithic 18V, 5A synchronous buck-boost DC/DC converter with 2.5V–18V input range, 0.8V–18V output range, 400kHz–2MHz programmable switching frequency, and integrated 30mΩ N-channel power switches. It delivers 5A output in buck mode (VIN > 6V), supports MPPC for solar/battery energy harvesting, and operates down to 250mV after startup-ideal for backup power and wide-input battery systems.
For engineers reviewing the LTC3119IFE#TRPBF datasheet, LTC3119IFE#TRPBF pinout, LTC3119IFE#TRPBF application, or LTC3119IFE#TRPBF equivalent, key selection considerations include its seamless buck-boost transition, Burst Mode® operation (35µA no-load IQ), 28-lead TSSOP thermal performance (θJA = 21°C/W), and compatibility with photovoltaic input regulation via MPPC functionality.
Technical Context
The LTC3119IFE#TRPBF implements a proprietary 4-switch PWM architecture enabling continuous conduction across VIN < VOUT, VIN = VOUT, and VIN > VOUT without mode-transition transients or subharmonics. Its current-mode control loop uses an internal 795mV feedback reference and error amplifier with 120µS transconductance for stable regulation under dynamic load steps.
It integrates dual bootstrap drivers (BST1/BST2) for high-side N-FET gate drive, a dedicated VCC LDO (3.7V ±150mV, 180mA limit), and a precision RUN comparator (1.205V threshold, 90mV hysteresis) for accurate input UVLO setting. The MPPC pin accepts a resistive divider to regulate input voltage at 798mV, enabling maximum power point tracking for capacitive or PV sources.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 18V continuous; operates down to 250mV after startup when VCC is bootstrapped-enables full discharge of supercapacitors or depleted batteries. |
| Output Voltage Range | 0.8V to 18V set by external resistor divider on FB pin-supports single-rail system supplies from logic to industrial bus voltages. |
| Max Output Current | 5A in buck mode (VIN > 6V); 3A at VIN = 3.6V/VOUT = 5V-determined by internal 8A current limit and thermal design in 28-lead TSSOP package. |
| Switching Frequency | 400kHz to 2MHz via RT resistor or external clock sync on PWM/SYNC pin-allows optimization of inductor size vs. efficiency in noise-sensitive applications. |
| No-Load Quiescent Current | 35µA in Burst Mode®-minimizes standby power loss in battery-backed systems without sacrificing fast wake-up response. |
| Power Switch RDS(ON) | 30mΩ per switch (PVIN→SW1, SW1→PGND, SW2→PGND, SW2→PVOUT)-reduces conduction losses and enables high-efficiency operation across wide VIN/VOUT ratios. |
| Feedback Reference | 795mV ±8mV over temperature-ensures tight output voltage accuracy (±1% typical) without external trimming components. |
Pinout & Package
The LTC3119IFE#TRPBF is housed in a 28-lead Plastic Enhanced TSSOP package with exposed pad (Pin 29 = PGND) requiring soldering to PCB ground plane for thermal integrity (θJA = 21°C/W). Pin functions are identical between QFN and TSSOP variants per datasheet Figure 12.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 19) | VCC Regulator Input | Supplies internal 3.7V LDO; must be decoupled with ≥4.7µF ceramic capacitor to PGND for stable biasing of control circuitry. |
| PVIN (Pins 22, 23) | Main Input Power Rail | Connects to high-side switch A; requires low-impedance path to ≥10µF bulk capacitor for ripple suppression and peak current delivery. |
| SW1 (Pins 21, 24) | Buck-Boost Inductor Node A | Drives one side of coupled inductor; connects to BST1 via 0.1µF capacitor for gate drive rail generation. |
| SW2 (Pins 5, 8) | Buck-Boost Inductor Node B | Drives opposite side of coupled inductor; connects to BST2 via 0.1µF capacitor for gate drive rail generation. |
| PVOUT (Pins 6, 7) | Main Output Power Rail | Delivers regulated output; requires low-ESR ≥10µF capacitor to PGND for transient response and ripple filtering. |
| FB (Pin 12) | Voltage Feedback Input | Sets output voltage via resistor divider; 795mV reference enables precise regulation independent of temperature drift. |
| MPPC (Pin 15) | Maximum Power Point Control | Accepts resistive divider from VIN to GND to regulate input voltage at 798mV-critical for solar charger and capacitor backup applications. |
| RUN (Pin 18) | Enable & UVLO Threshold Input | Enables IC when >1.205V; hysteresis prevents chatter during brownout; external divider sets custom input undervoltage lockout. |
| PWM/SYNC (Pin 28) | Mode Control & Clock Sync | High = forced PWM mode; low = Burst Mode®; external clock sync up to 2MHz enables EMI reduction in noise-sensitive systems. |
| PGOOD (Pin 10) | Open-Drain Power-Good Indicator | Pulls low when FB drops >8% below regulation-provides system-level fault signaling for sequencing or monitoring. |
Key Features
| Feature | Design Value |
|---|---|
| Seamless Buck-Boost Transition | Proprietary 4-switch PWM eliminates output glitches and subharmonics when crossing VIN = VOUT-enables stable powering of FPGAs or processors during battery voltage sag. |
| Burst Mode® Operation | 35µA no-load IQ with automatic PWM/Burst transition-extends runtime in portable medical devices and IoT sensors without manual mode switching. |
| Maximum Power Point Control (MPPC) | 798mV input regulation threshold with 50nA pin current-allows direct interface to photovoltaic panels or supercapacitors without external MPPT controller. |
| Integrated VCC LDO | 3.7V ±150mV output, 180mA current limit-powers internal circuits and can supply external bias (e.g., ADC reference, level shifters) up to 10mA. |
| Accurate RUN Comparator | 1.205V ±35mV threshold with 90mV hysteresis-enables precise, temperature-stable input UVLO for Li-ion battery cutoff or backup switchover. |
| Thermal-Enhanced TSSOP | 28-lead package with exposed PGND pad (θJA = 21°C/W)-delivers 5A output capability in compact footprint without heatsink in ambient ≤60°C. |
Applications
| Solar Battery Chargers | System Backup Power Supplies |
|---|---|
Use Scenario: Photovoltaic panel charging a 12V lead-acid or LiFePO₄ battery bank with variable irradiance and partial shading. IC Role / Device Role / Timing Role: Buck-boost regulator with MPPC actively regulates panel voltage at maximum power point while delivering constant-current/constant-voltage charge profile. Use Value: Achieves >94% peak efficiency at 5A/12V output (VIN = 18V) and extracts up to 30% more energy from mismatched or shaded panels versus fixed-input converters. | Use Scenario: Seamless switchover from main AC/DC supply to supercapacitor bank during grid outage in industrial PLC I/O modules. IC Role / Device Role / Timing Role: Wide-input buck-boost maintains 5V/3A output as supercapacitor discharges from 15V to 250mV, with PGOOD signaling system reset upon failure. Use Value: Enables >10-second hold-up time using 100F/2.7V supercapacitors without external boost stages or complex sequencing logic. |
| RF Power Supplies | 1- to 4-Cell Lithium Battery Powered Products |
Use Scenario: Stable 5V/2A supply for GaN PA biasing in 5G small-cell base stations with stringent ripple (<10mVpp) and EMI requirements. IC Role / Device Role / Timing Role: Fixed-frequency PWM mode (1.2MHz) synchronized to system clock minimizes beat frequencies; ultralow-noise switching preserves RF signal integrity. Use Value: Delivers 92% efficiency at 2A load with <5mVpp output ripple-meets EN55022 Class B conducted EMI limits without additional filtering. | Use Scenario: Portable ultrasound scanner powered by 3.6V nominal Li-ion battery (2.8V–4.2V range) requiring regulated 3.3V/1.5A for FPGA and analog front-end. IC Role / Device Role / Timing Role: Buck-boost maintains constant 3.3V output across full battery discharge curve, with Burst Mode® extending idle time between scans. Use Value: Provides 93% efficiency at 1.5A and 35µA quiescent current-enables >8-hour battery life with 5-minute active scanning intervals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS63020DSJR | Lower 5.5V max input, 3A max output, no MPPC, 2.5MHz max fSW, 20mΩ switches | Not suitable for >5.5V inputs (e.g., 12V backup, solar), lacks input regulation for energy harvesting | Select only for cost-sensitive, low-power (≤3A) applications with VIN ≤5.5V and no MPPC requirement. |
| MAX20406AATG+T | 6V max input, 4A output, integrated telemetry, no MPPC, 2.2MHz max fSW, 12mΩ switches | Cannot support 12V/18V inputs or sub-250mV operation; telemetry adds complexity but enables health monitoring | Prefer for automotive infotainment with 5V rail and diagnostics need; avoid for wide-VIN industrial or energy-harvesting use cases. |
Compared with TPS63020DSJR and MAX20406AATG+T, the LTC3119IFE#TRPBF uniquely supports 18V input, 5A output, MPPC, and 250mV dropout-making it the only choice for high-voltage backup, solar charging, and deep-discharge battery systems where input regulation and wide dynamic range are mandatory.
Availability
LTC3119IFE#TRPBF 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 traceable sourcing.
Supply support for LTC3119IFE#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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors for precision instrumentation, industrial automation, and power management.
The LTC3119IFE#TRPBF belongs to Linear's high-efficiency monolithic DC/DC converter product line, designed specifically for wide-input, high-current applications demanding seamless buck-boost operation, ultra-low quiescent power, and intelligent input regulation in space-constrained environments.
FAQ
What is the minimum input voltage required for startup of the LTC3119IFE#TRPBF?
The LTC3119IFE#TRPBF requires a minimum input voltage of 2.5V to initiate startup, as governed by the VCC undervoltage lockout threshold. Once operational, it can continue regulating down to 250mV input if VCC is externally bootstrapped-enabling full utilization of supercapacitors or deeply discharged batteries. This behavior is confirmed in the Electrical Characteristics table (Note 4) and Typical Performance Characteristics (Figure G26).
Does the LTC3119IFE#TRPBF support synchronization to an external clock, and what is the maximum frequency?
Yes, the LTC3119IFE#TRPBF supports external clock synchronization via the PWM/SYNC pin up to 2MHz. The internal PLL can only increase the oscillator frequency, so the RT resistor must be selected to program a base frequency lower than the sync clock. Minimum pulse width is 100ns, and sync is valid across the full 400kHz–2MHz operating range per the Electrical Characteristics table and Applications section.
How does the Maximum Power Point Control (MPPC) function work on the LTC3119IFE#TRPBF?
The MPPC pin on the LTC3119IFE#TRPBF is a precision 798mV input regulation comparator. When connected to a resistive divider from VIN to GND, it forces the input voltage to maintain 798mV at the pin-thereby regulating the source (e.g., solar panel or capacitor) at its maximum power point. The pin draws only 50nA, minimizing divider current error, and is disabled when tied to VCC per the Pin Functions description.
What is the thermal performance difference between the LTC3119IFE#TRPBF and the QFN variant LTC3119EUFD#TRPBF?
The LTC3119IFE#TRPBF in 28-lead TSSOP has θJA = 21°C/W, while the LTC3119EUFD#TRPBF in 4mm × 5mm QFN has θJA = 22°C/W. Both packages share identical junction-to-case thermal resistance and require exposed-pad soldering to PCB ground. The TSSOP offers slightly better board-level heat spreading in constrained layouts, whereas the QFN provides superior thermal performance in high-airflow or heatsinked assemblies.
Can the LTC3119IFE#TRPBF operate in Burst Mode® and PWM mode simultaneously?
No-the LTC3119IFE#TRPBF operates exclusively in either Burst Mode® (light loads, <400mA typical) or fixed-frequency PWM mode (heavier loads), with automatic seamless transition between them. Forcing PWM/SYNC high locks it into PWM mode regardless of load; pulling it low enables Burst Mode®. The device never blends both modes-it selects the optimal one based on load current and control pin state per the Operation section and Figure G29–G37.
LTC3119IFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width) 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-TSSOP-EP
LTC3119IFE#TRPBF FAQ
1.How can I place an order for LTC3119IFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3119IFE#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 LTC3119IFE#TRPBF reliable?
The price and inventory of LTC3119IFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3119IFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3119IFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3119IFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3119IFE#TRPBF?
LTC3119IFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3119IFE#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 LTC3119IFE#TRPBF?
For technical support, including LTC3119IFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3119IFE#TRPBF requirements.
6.How does Aetrix verify that LTC3119IFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3119IFE#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 LTC3119IFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3119IFE#TRPBF?
All LTC3119IFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3119IFE#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 LTC3119IFE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3119IFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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