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Analog Devices Inc. LTC3119HFE#PBF
- Part No.:
- LTC3119HFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3119HFE#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 5A 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:784
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Product details
Overview
LTC3119HFE#PBF from Analog Devices is a high-efficiency, monolithic 4-switch synchronous buck-boost DC/DC converter delivering up to 5A output current with 2.5V–18V input and 0.8V–18V output voltage ranges. It features seamless mode transition, programmable 400kHz–2MHz switching frequency, and operates down to 250mV after startup-enabling full utilization of supercapacitors and battery stacks in backup power and solar charging systems.
For engineers reviewing the LTC3119HFE#PBF datasheet, LTC3119HFE#PBF pinout, LTC3119HFE#PBF application, or LTC3119HFE#PBF equivalent, key selection considerations include its –40°C to 150°C guaranteed junction temperature rating, 28-lead enhanced TSSOP package with exposed PGND pad, MPPC input regulation capability, and Burst Mode® operation achieving 35µA no-load quiescent current.
Technical Context
The LTC3119HFE#PBF implements a proprietary 4-switch PWM architecture that enables continuous regulation across buck, buck-boost, and boost modes without output transients or subharmonic oscillation. Its current-mode control loop uses an internal 795mV feedback reference and error amplifier with 120µS transconductance for stable compensation.
It integrates dual bootstrap drivers (BST1/BST2), on-chip VCC LDO (3.7V ±150mV), and accurate RUN comparator (1.205V threshold with 90mV hysteresis) for custom UVLO. The MPPC pin supports photovoltaic input regulation via external resistive divider, while the PWM/SYNC pin enables external clock synchronization up to 2MHz using an internal PLL.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 18V; supports unregulated sources including 1–4-cell Li-ion, lead-acid, and backup capacitors. |
| Output Voltage Range | 0.8V to 18V; adjustable via FB resistor divider; enables single-rail supply for mixed-voltage systems. |
| Continuous Output Current | 5A in buck mode (VIN > 6V); 3A at VIN = 3.6V/VOUT = 5V; determined by thermal limits and switch RDS(ON). |
| Switching Frequency | 400kHz to 2MHz; set by RT resistor or synchronized externally; balances efficiency vs. size in noise-sensitive designs. |
| Quiescent Current | 35µA in Burst Mode® no-load; 3µA in shutdown; extends battery life in always-on IoT and sensor nodes. |
| Operating Junction Temp | –40°C to +150°C; guaranteed over full range (H-grade); suitable for under-hood automotive and industrial edge controllers. |
| MPPC Input Regulation | 774–822mV threshold; enables maximum power point tracking for solar chargers and energy-harvesting systems. |
Pinout & Package
Package: 28-lead Plastic Enhanced TSSOP with exposed thermal pad (Pin 29 = PGND). Requires soldering of exposed pad to PCB ground plane for thermal performance (θJA = 21°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (Pins 4,9,20,25,29) | Power Ground | Low-impedance return path for all high-current switches; exposed pad must be soldered to PCB ground plane. |
| VIN (Pin 19) | VCC Regulator Input | Supplies internal 3.7V LDO; decoupled with 4.7µF capacitor; independent of main PVIN path. |
| PVIN (Pins 22,23) | Main Input Power | Connects to switch A; requires ≥10µF low-ESR input capacitor; handles full input current. |
| PVOUT (Pins 6,7) | Main Output Power | Connects to switch D; supplies regulated output; requires ≥10µF low-ESR output capacitor. |
| SW1 (Pins 21,24) | Buck-Boost Switch Node A | Connects to one side of inductor; drives high-side N-channel switch in buck and buck-boost modes. |
| SW2 (Pins 5,8) | Buck-Boost Switch Node B | Connects to other side of inductor; drives low-side N-channel switch in all operating modes. |
| BST1 (Pin 26) | SW1 Gate Drive Bootstrap | Connected to SW1 via 0.1µF capacitor; generates gate drive voltage above SW1 for high-side NMOS. |
| BST2 (Pin 3) | SW2 Gate Drive Bootstrap | Connected to SW2 via 0.1µF capacitor; generates gate drive voltage above SW2 for high-side NMOS. |
| FB (Pin 12) | Feedback Input | Sets output voltage via resistor divider; 795mV nominal reference; high-impedance input (50nA max). |
| RT (Pin 17) | Oscillator Programming | Resistor to GND sets switching frequency; 76.8kΩ yields 1MHz; tolerance affects frequency accuracy. |
| RUN (Pin 18) | Enable & UVLO Control | Enables IC when >1.205V; provides accurate input undervoltage lockout with external resistor divider. |
| MPPC (Pin 15) | Max Power Point Setpoint | Configures input regulation voltage for solar/battery harvesting; tie to VCC to disable function. |
| PWM/SYNC (Pin 28) | Mode Control & Sync Input | High = forced PWM; low = Burst Mode®; external clock sync up to 2MHz with ≥100ns pulse width. |
| PGOOD (Pin 10) | Power Good Indicator | Open-drain output asserting when FB is within ±8% of target; requires external pull-up resistor. |
| VC (Pin 13) | Error Amplifier Output | Compensation node; connects to SGND via RC network to stabilize control loop bandwidth and phase margin. |
Key Features
| Feature | Design Value |
|---|---|
| 4-Switch Synchronous Architecture | Enables seamless buck/boost transitions without output glitches or mode-dependent instability. |
| Ultralow-Noise PWM Algorithm | Eliminates subharmonics and maintains clean spectral content across entire VIN/VOUT range. |
| Maximum Power Point Control (MPPC) | Allows direct input voltage regulation from current-limited sources like solar panels or fuel cells. |
| Internal VCC LDO with 10mA Drive | Provides regulated 3.7V rail for internal logic and can power external bias circuitry or level-shifters. |
| Thermal Grade H (–40°C to 150°C) | Guaranteed operation over full junction range; eliminates derating assumptions in high-temp environments. |
| Programmable Soft-Start (6ms) | Prevents inrush current during startup; configurable via external capacitor on VC pin if needed. |
Applications
| Solar Battery Chargers | System Backup Power Supplies |
|---|---|
Use Scenario: Photovoltaic panel feeding a 12V battery bank through MPPT regulation. IC Role / Device Role / Timing Role: Buck-boost regulator with MPPC input regulation and wide VIN range to extract maximum power across varying irradiance and temperature. Use Value: Achieves >94% peak efficiency at 5A/12V output with 2MHz switching, minimizing board area while maintaining >90% efficiency down to 100mA load in Burst Mode®. |
Use Scenario: Supercapacitor-based hold-up supply for industrial PLC I/O modules during AC mains interruption. IC Role / Device Role / Timing Role: Bidirectional-capable buck-boost controller enabling deep discharge (down to 250mV) and fast recharge from 12V rail. Use Value: Delivers 5A continuous output from 2.5V–18V input, supporting >10-second runtime with 50F/2.7V supercapacitor stack and zero PCB layout changes vs. legacy solutions. |
| RF Power Supplies | 1- to 4-Cell Lithium Battery Powered Products |
Use Scenario: Bias supply for GaN RF power amplifier requiring ultra-low noise and tight load regulation. IC Role / Device Role / Timing Role: Low-noise buck-boost converter operating in fixed-frequency PWM mode with synchronized clock input to avoid interference in sensitive RF bands. Use Value: Delivers <20mVpp output ripple at 5A load with 1MHz switching; PGOOD signal enables real-time health monitoring of PA bias rail. |
Use Scenario: Portable medical monitor powered by 3.7V Li-ion battery, requiring 3.3V and 5V rails across varying SOC. IC Role / Device Role / Timing Role: Single-chip dual-output capable regulator (with external LDO post-regulation) maintaining regulation as battery discharges from 4.2V to 2.8V. Use Value: Maintains >92% efficiency at 3A/3.3V output even at 3.6V input; 35µA Burst Mode® IQ extends runtime by >30% versus conventional buck-boost ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3115EUF#PBF | Lower 3.5A output current; 3.6V–36V input; no MPPC; 20-lead QFN only | Not suitable for sub-3.6V startup or solar MPPT; limited thermal performance (125°C max) | Select when input never drops below 3.6V and MPPC is unnecessary; lower cost for less demanding industrial use. |
| TPS63020DSJR | 3A output; 1.8V–6.5V input; 2.5V–6.5V output; no MPPC; 14-pin WSON | Cannot support 12V systems or supercapacitor start-up; lacks precision RUN comparator and PGOOD | Choose for compact, low-voltage portable devices where 12V compatibility and input regulation are not required. |
Compared with LTC3115EUF#PBF and TPS63020DSJR, the LTC3119HFE#PBF uniquely combines 5A capability, 250mV startup, MPPC, and 150°C operation-making it the only option for high-reliability, wide-input, energy-harvesting applications requiring guaranteed performance at extreme temperatures.
Availability
LTC3119HFE#PBF is available at Aetrix Electronics and suitable for system backup power supplies, solar battery chargers, and RF power supplies requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LTC3119HFE#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 digital signal processing technologies.
The LTC3119 belongs to Linear's high-efficiency monolithic DC/DC converter family, designed specifically for wide-input, high-current, thermally demanding applications including energy harvesting, automotive subsystems, and industrial backup power.
FAQ
What is the guaranteed operating junction temperature range for the LTC3119HFE#PBF?
The LTC3119HFE#PBF is fully specified and guaranteed over a junction temperature range of –40°C to +150°C. This H-grade rating is validated per Analog Devices' production test flow and exceeds the –40°C to +125°C range of E/I-grade variants. Thermal design must ensure θJA ≤ 21°C/W via proper PCB copper area and exposed pad soldering to maintain reliability at maximum ambient conditions.
How does the MPPC function work in the LTC3119HFE#PBF, and what is its typical application?
The MPPC pin in the LTC3119HFE#PBF sets an input voltage regulation threshold (774–822mV) to maintain operation at the maximum power point of current-limited sources. When configured with a resistor divider from PVIN to GND, it regulates input current to prevent collapse under heavy load-commonly used in solar battery chargers and thermoelectric energy harvesters. Tie MPPC to VCC to disable this feature.
Can the LTC3119HFE#PBF operate with input voltages below 2.5V, and if so, how?
Yes-the LTC3119HFE#PBF can operate with input voltages as low as 250mV after startup, provided VCC is bootstrapped externally (e.g., from VOUT or a separate bias rail) to maintain the internal regulator above its 2.25V UVLO threshold. This enables full energy extraction from supercapacitors and depleted batteries where conventional buck-boost ICs would shut down.
What is the purpose of the BST1 and BST2 pins on the LTC3119HFE#PBF, and how must they be connected?
BST1 and BST2 are bootstrap rails for the high-side N-channel gate drivers of SW1 and SW2, respectively. Each must be connected to its corresponding switch node (SW1 or SW2) via a 0.1µF ceramic capacitor. These connections generate gate drive voltages above the switch node potential, enabling full enhancement of the high-side MOSFETs in all operating modes-including buck, boost, and buck-boost transitions.
Does the LTC3119HFE#PBF support external clock synchronization, and what are the timing requirements?
Yes-the LTC3119HFE#PBF supports external clock synchronization via the PWM/SYNC pin using an internal PLL. The external clock must exceed the RT-programmed frequency (400kHz–2MHz), with minimum high/low pulse widths of 100ns each. Synchronization eliminates beat frequencies in multi-rail systems and reduces EMI in noise-sensitive applications such as medical imaging or precision instrumentation.
LTC3119HFE#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 ~ 150°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSSOP-EP
LTC3119HFE#PBF FAQ
1.How can I place an order for LTC3119HFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3119HFE#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 LTC3119HFE#PBF reliable?
The price and inventory of LTC3119HFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3119HFE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3119HFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3119HFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3119HFE#PBF?
LTC3119HFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3119HFE#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 LTC3119HFE#PBF?
For technical support, including LTC3119HFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3119HFE#PBF requirements.
6.How does Aetrix verify that LTC3119HFE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3119HFE#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 LTC3119HFE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3119HFE#PBF?
All LTC3119HFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3119HFE#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 LTC3119HFE#PBF part is unused and in its original packaging.
Return procedure for LTC3119HFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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