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Analog Devices Inc. LTC3119IFE#PBF
- Part No.:
- LTC3119IFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3119IFE#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 5A 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:313
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Product details
Overview
LTC3119IFE#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, 400kHz–2MHz programmable switching frequency, and maximum power point control (MPPC). It delivers 5A continuous output in buck mode (VIN > 6V), supports VIN as low as 250mV after startup, and targets high-efficiency power conversion in battery-backed and energy-harvesting systems.
For engineers reviewing the LTC3119IFE#PBF datasheet, LTC3119IFE#PBF pinout, LTC3119IFE#PBF application, or LTC3119IFE#PBF equivalent, key selection criteria include its seamless buck-boost transition, ultralow-noise PWM operation, MPPC for photovoltaic/supercapacitor sources, thermal performance in TSSOP package, and compatibility with external clock synchronization up to 2MHz.
Technical Context
The LTC3119IFE#PBF implements a current-mode controlled 4-switch buck-boost topology enabling continuous regulation across VIN < VOUT, VIN = VOUT, and VIN > VOUT without mode-switching transients. Its internal VCC LDO (3.7V ±150mV) powers control circuitry and supports up to 10mA external load, while integrated 30mΩ N-channel switches minimize conduction loss.
Operation includes Burst Mode® (31µA no-load IQ) and fixed-frequency PWM modes, selectable via PWM/SYNC pin. The RUN pin provides accurate UVLO threshold (1.205V typ, 90mV hysteresis), and MPPC pin enables input voltage regulation at 798mV (±24mV) for solar or supercapacitor interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 18V; supports unregulated sources including 1–4-cell Li-ion stacks and backup capacitors |
| Output Voltage Range | 0.8V to 18V; programmable via FB resistor divider, enabling wide-ratio regulation |
| Continuous Output Current | 5A in buck mode (VIN > 6V); 3A at VIN = 3.6V/VOUT = 5V; limited by thermal design and inductor choice |
| Switching Frequency | 400kHz to 2MHz; set by RT resistor or synchronized externally via PWM/SYNC pin |
| Quiescent Current | 31µA in Burst Mode® no-load; 3µA shutdown current ensures ultra-low standby power |
| Power Switch RDS(ON) | 30mΩ per switch (PVIN→SW1, SW1→PGND, SW2→PGND, SW2→PVOUT); reduces conduction loss and thermal stress |
| MPPC Threshold | 798mV ±24mV; enables precise input voltage regulation for photovoltaic or supercapacitor energy harvesting |
Pinout & Package
The LTC3119IFE#PBF is housed in a 28-lead Plastic Enhanced TSSOP package with exposed pad (Pin 29 = PGND) requiring soldering to PCB ground plane for thermal performance (θJA = 21°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (Pins 4, 9, 20, 25, Exposed Pad 29) | Power Ground | Low-impedance return path for high-current switches; exposed pad must be soldered to PCB ground plane |
| SW1 (Pins 21, 24) | Buck-Boost Power Switch A | Connects to one side of inductor; drives high-side switch in buck mode and low-side in boost mode |
| SW2 (Pins 5, 8) | Buck-Boost Power Switch D | Connects to same inductor node as SW1; drives low-side switch in buck mode and high-side in boost mode |
| PVIN (Pins 22, 23) | Main Input Power Rail | High-current input connection to switch A; requires ≥10µF low-ESR capacitor to PGND |
| PVOUT (Pins 6, 7) | Main Output Power Rail | High-current output connection to switch D; requires ≥10µF low-ESR capacitor to PGND |
| FB (Pin 12) | Feedback Input | Sets regulated output voltage via resistor divider; nominal 795mV reference enables 0.8–18V VOUT |
| RT (Pin 17) | Oscillator Programming | Resistor to GND sets switching frequency from 400kHz to 2MHz; enables size/efficiency tradeoffs |
| RUN (Pin 18) | Enable & UVLO Control | Logic enable input with accurate 1.205V rising threshold and 90mV hysteresis for custom input undervoltage lockout |
| MPPC (Pin 15) | Max Power Point Setpoint | 798mV reference input for regulating input voltage; connects to resistive divider from VIN to GND |
| PWM/SYNC (Pin 28) | Mode Control & Clock Sync | Selects Burst Mode® (low) or PWM (high); accepts external clock up to 2MHz for EMI-sensitive applications |
Key Features
| Feature | Design Value |
|---|---|
| 4-Switch Buck-Boost Topology | Enables seamless regulation across input-to-output voltage ratios without discontinuous transitions or subharmonics |
| Maximum Power Point Control (MPPC) | Regulates input voltage at 798mV for optimal power extraction from photovoltaic panels or supercapacitors |
| Ultralow-Noise PWM Algorithm | Minimizes conducted and radiated EMI during buck, boost, and buck-boost transitions |
| Internal VCC LDO with 10mA Drive | Provides stable 3.7V supply for internal circuitry and powers external bias rails without extra regulators |
| Thermal-Enhanced TSSOP Package | 28-lead enhanced TSSOP with exposed PGND pad achieves θJA = 21°C/W for high-power density designs |
| Burst Mode® Operation | Reduces no-load input current to 31µA while maintaining tight output regulation and fast load transient response |
Applications
| Solar Battery Chargers | RF Power Supplies |
|---|---|
Use Scenario: Photovoltaic panel charging a 12V Li-ion battery bank under variable irradiance conditions. IC Role / Device Role / Timing Role: Buck-boost regulator with MPPC actively tracks panel's maximum power point while regulating battery charge voltage. Use Value: Enables >92% peak efficiency across 2.5V–18V input range and extends usable sunlight hours by extracting full available panel power. | Use Scenario: Powering RF power amplifiers in portable communications equipment with fluctuating battery voltage. IC Role / Device Role / Timing Role: Stable 5V/3.3V supply delivering up to 5A with ultralow-noise PWM to prevent RF signal distortion. Use Value: Maintains clean spectral purity in transmit paths by eliminating switching noise coupling into sensitive RF stages. |
| System Backup Power Supplies | Lead Acid to 12V Regulator |
Use Scenario: Supercapacitor-based backup supply maintaining 5V rail during main power failure in industrial controllers. IC Role / Device Role / Timing Role: Buck-boost converter operating down to 250mV input to fully discharge supercapacitors while sustaining regulated output. Use Value: Extends backup runtime by 35% compared to conventional converters limited to 2.5V minimum input. | Use Scenario: Regulating automotive lead-acid battery (9V–16V) to stable 12V for infotainment system logic rails. IC Role / Device Role / Timing Role: Wide-input buck-boost maintains 12V output during cold-crank (as low as 6V) and load-dump (up to 18V) events. Use Value: Eliminates need for pre-regulator stages and supports direct battery connection with no external protection circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3115EFE#PBF | Lower 3.5A output current, 3.3V–40V input, no MPPC, fixed 500kHz/1MHz freq | Targeted at higher-input industrial supplies; lacks solar/supercapacitor optimization | Select when input exceeds 18V or MPPC is unnecessary; lower cost for less demanding specs |
| TPS63020DSJR | 2.5V–6V input, 3A output, integrated compensation, no MPPC or sync capability | Optimized for compact consumer battery-powered devices; not suitable for >6V input or precision MPP tracking | Choose for space-constrained portable designs with ≤6V input; simpler layout but limited voltage range |
Compared with LTC3115EFE#PBF and TPS63020DSJR, the LTC3119IFE#PBF uniquely combines 5A output, 2.5V–18V input, MPPC, and 400kHz–2MHz synchronization-making it the only option for high-current, wide-input, energy-harvesting applications requiring seamless buck-boost regulation.
Availability
LTC3119IFE#PBF is available at Aetrix Electronics and suitable for solar battery chargers, RF power supplies, and system backup power supplies requiring stable component supply, extended temperature operation (–40°C to 125°C), and long-term industrial lifecycle support.
Supply support for LTC3119IFE#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 industrial, automotive, communications, and aerospace markets.
The LTC3119IFE#PBF belongs to the LTC® high-efficiency power conversion product line, designed specifically for wide-input, high-current buck-boost applications in energy harvesting, battery backup, and ruggedized power systems.
FAQ
What is the minimum input voltage the LTC3119IFE#PBF can operate from after startup?
The LTC3119IFE#PBF can operate with input voltages as low as 250mV after startup, provided the VCC rail is maintained-enabling full energy extraction from supercapacitors and depleted batteries. This capability is enabled by internal bootstrap circuitry and low-threshold control logic, distinct from its 2.5V minimum specified input range for initial startup.
Does the LTC3119IFE#PBF support external clock synchronization, and what is the maximum frequency?
Yes, the LTC3119IFE#PBF supports external clock synchronization via the PWM/SYNC pin up to 2MHz. The internal PLL locks to the external clock only if the programmed RT frequency is lower than the sync signal, requiring proper margin for oscillator and clock tolerance. This feature reduces EMI in noise-sensitive RF and medical applications.
How does the Maximum Power Point Control (MPPC) function work on the LTC3119IFE#PBF?
The MPPC pin on the LTC3119IFE#PBF is a 798mV reference input that regulates the input voltage by adjusting the converter's duty cycle. When connected to a resistive divider from VIN to GND, it forces the input to maintain the voltage where the divider taps 798mV-matching the maximum power point of photovoltaic cells or optimizing supercapacitor discharge.
What thermal considerations apply to the LTC3119IFE#PBF in its TSSOP package?
The LTC3119IFE#PBF in the 28-lead Enhanced TSSOP package has a junction-to-ambient thermal resistance (θJA) of 21°C/W. Successful thermal design requires soldering the exposed PGND pad (Pin 29) to a minimum 100mm² copper area connected to inner-layer ground planes. Without this, thermal derating begins above ~2.5A continuous load at 25°C ambient.
Can the LTC3119IFE#PBF be used in both buck and boost configurations simultaneously?
Yes-the LTC3119IFE#PBF uses a single 4-switch buck-boost topology that inherently operates across all three regions: buck (VIN > VOUT), boost (VIN < VOUT), and buck-boost (VIN ≈ VOUT). Its proprietary PWM algorithm ensures seamless, transient-free transitions between modes without external control, maintaining regulation and loop stability throughout.
LTC3119IFE#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
LTC3119IFE#PBF FAQ
1.How can I place an order for LTC3119IFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3119IFE#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 LTC3119IFE#PBF reliable?
The price and inventory of LTC3119IFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3119IFE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3119IFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3119IFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3119IFE#PBF?
LTC3119IFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3119IFE#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 LTC3119IFE#PBF?
For technical support, including LTC3119IFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3119IFE#PBF requirements.
6.How does Aetrix verify that LTC3119IFE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3119IFE#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 LTC3119IFE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3119IFE#PBF?
All LTC3119IFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3119IFE#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 LTC3119IFE#PBF part is unused and in its original packaging.
Return procedure for LTC3119IFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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