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Analog Devices Inc. LTC3114MPFE-1#PBF
- Part No.:
- LTC3114MPFE-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3114MPFE-1#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 1A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:156
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Product details
Overview
LTC3114MPFE-1#PBF from Analog Devices is a 40V, 1A synchronous buck-boost DC/DC converter with programmable average output current, wide input (2.2V–40V) and output (2.7V–40V) voltage ranges, and AEC-Q100 qualification for automotive power systems. It delivers up to 96% efficiency in PWM mode, supports seamless buck/boost transitions, and integrates four internal N-channel MOSFETs with 250mΩ RDS(ON). It is used in 12V/24V solar battery charging and high-power LED driver applications.
For engineers reviewing the LTC3114MPFE-1#PBF datasheet, LTC3114MPFE-1#PBF pinout, LTC3114MPFE-1#PBF application, or LTC3114MPFE-1#PBF equivalent, key selection criteria include its –55°C to 150°C operating junction temperature range, programmable output current via PROG pin (±5% accuracy), 1.2MHz fixed-frequency PWM operation, and TSSOP-16 package with exposed PGND pad for thermal management.
Technical Context
The LTC3114MPFE-1#PBF employs average current mode control with a proprietary four-switch buck-boost topology that enables continuous regulation when VIN is above, below, or equal to VOUT. Its 1.2MHz oscillator ensures low-noise operation and compact external component sizing.
It integrates an internal 4.4V LDO (PLDO/LDO pins) for gate driver supply and control circuitry, with accurate RUN pin threshold (1.205V typ, 140mV hysteresis) for programmable UVLO, and Burst Mode® operation achieving 30µA no-load IQ when bootstrapped. Overtemperature, short-circuit, and soft-start protections are built-in.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.2V to 40V - supports wide-source inputs including 12V lead-acid, 24V industrial rails, and unregulated solar panels. |
| Output Voltage Range | 2.7V to 40V - configurable via FB resistor divider; enables single-inductor regulation across buck/boost boundaries. |
| Max Output Current | 1A in buck mode - sufficient for high-brightness LED strings or 5V/1A system rails without external current boosting. |
| Switching Frequency | 1.2MHz ±200kHz - enables use of small 6.8µH inductors and low-ESR ceramic capacitors for space-constrained designs. |
| Efficiency | Up to 96% - achieved at mid-load in PWM mode; Burst Mode reduces no-load IQ to 30µA for always-on automotive modules. |
| Operating Temperature | –55°C to 150°C - qualified per AEC-Q100 Grade MP, enabling under-hood and industrial control cabinet deployment. |
| PROG Current Gain | 40µA/A - allows precise average output current programming (e.g., 500mA → 20µA on PROG) with <±5% setpoint accuracy. |
Pinout & Package
Package: 16-lead plastic TSSOP (FE) with exposed PGND pad (Pin 17), 3.2mm × 4.4mm footprint, θJA = 38°C/W. Requires soldering of exposed pad to PCB ground plane for rated thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (1, 17) | Power Ground | Main return path for high-current switches; exposed pad must be soldered to PCB ground plane for thermal and EMI control. |
| SW2 (2) | Buck-Boost Switch Node | Connects to one end of inductor; carries full switching current in both buck and boost modes. |
| PVOUT (3) | Power Output | High-current output node; requires ≥10µF low-ESR capacitor placed adjacent to IC with short PGND return. |
| RUN (4) | Enable / UVLO Control | Enables IC when >1.205V; hysteresis ensures clean turn-on/turn-off; supports custom input undervoltage lockout. |
| PROG (5) | Current Sense Output | Delivers 40µA per ampere of switch D current; used to program average output current or monitor load via external RC network. |
| VC (6) | Error Amplifier Output | Compensation node requiring external RC network (CP1, CP2, RZ) for loop stability across all operating conditions. |
| FB (7) | Voltage Feedback Input | Sets output voltage via resistor divider; nominal 1.0V reference enables precise VOUT = 1 + RTOP/RBOT. |
| GND (8) | Signal Ground | Reference for control circuitry; must be tied to system ground but kept separate from noisy PGND traces until star point. |
| LDO / PLDO (9, 11) | Internal Regulator I/O | LDO powers control logic; PLDO supplies gate drivers; pins must be connected together with ≥4.7µF bypass capacitor. |
| VIN / PVIN (10, 14) | Input Supply Nodes | VIN powers internal VCC regulator; PVIN is main power input; both must be connected with low-inductance path and ≥10µF local capacitance. |
| BST1 / BST2 (12, 13) | Flying Capacitor Terminals | Drive gate drivers for SW1/SW2 via 68nF bootstrap caps; require shortest possible PCB traces to minimize ringing and loss. |
| SW1 (15) | Buck-Boost Switch Node | Second inductor connection point; operates complementarily to SW2 depending on mode (buck/boost/transition). |
| MODE (16) | Operation Mode Select | High = forced PWM (1.2MHz); Low = Burst Mode (30µA IQ); auto-transitions to PWM at higher loads. |
Key Features
| Feature | Design Value |
|---|---|
| Four-switch synchronous buck-boost topology | Eliminates need for external diodes or complex controller+MOSFET combinations; enables seamless VIN/VOUT crossover without output glitches. |
| Programmable average output current | Set via single resistor on PROG pin with ±5% accuracy; supports constant-current LED drive and battery charge control without sense resistor losses. |
| AEC-Q100 qualified (MP grade) | Rated for –55°C to 150°C junction temperature; includes overtemperature protection and robust latch-free operation for automotive under-hood use. |
| 1.2MHz ultralow-noise PWM | Fixed frequency minimizes EMI filtering requirements; proprietary control algorithm suppresses subharmonics and ensures stable operation across all duty cycles. |
| Integrated 4.4V LDO with PLDO output | Supplies gate drivers and internal logic from VIN; eliminates need for external bias rail while maintaining high efficiency across input range. |
Applications
| Automotive Power Systems | 12V/24V Solar Panel Battery Charging |
|---|---|
Use Scenario: Regulating variable solar panel output (18–40V) to charge 12V lead-acid or LiFePO4 batteries in off-grid vehicles. IC Role / Device Role / Timing Role: Buck-boost DC/DC converter providing constant-current/constant-voltage charge profile with input voltage independence. Use Value: Maintains >92% efficiency across full solar MPPT range; PROG pin enables adaptive charge current scaling based on panel irradiance. |
Use Scenario: Powering industrial IoT sensors and telemetry modules from 12V vehicle batteries subject to cold cranking dips (down to 2.2V). IC Role / Device Role / Timing Role: Wide-input buck-boost regulator delivering stable 3.3V or 5V to microcontrollers and radios during engine start transients. Use Value: Operates down to 2.2V input and survives 45V load dump spikes; RUN pin hysteresis prevents brownout oscillation during voltage recovery. |
| High Power LED Driver | 24V Industrial Power Supply |
Use Scenario: Driving multi-string white LEDs (36V @ 700mA) from 24V rail in commercial lighting fixtures. IC Role / Device Role / Timing Role: Constant-current buck-boost LED driver using PROG feedback and FB voltage regulation for dimming compatibility. Use Value: Delivers 1A output with <±2% current accuracy; integrated current sensing avoids external shunt losses and thermal drift errors. |
Use Scenario: Generating isolated 5V/1A auxiliary supply from 24V factory automation bus with strict EMI limits. IC Role / Device Role / Timing Role: Primary-side non-isolated buck-boost regulator feeding downstream isolated DC/DC module. Use Value: 1.2MHz switching enables compact 6.8µH inductor; Burst Mode reduces standby power to <150µW, meeting Energy Star requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3115EDHC-1#PBF | Same architecture, 3mm × 5mm DFN package, –40°C to 125°C rating; lower max junction temperature and no AEC-Q100 qualification. | Suitable for commercial/industrial designs where extended temperature and automotive reliability are not required. | Select when board space is constrained and automotive qualification is unnecessary; DFN offers better θJC but lacks MP-grade ruggedness. |
| MAX20406AATL+ | 36V, 2.5A buck-boost with I2C interface; different control scheme (peak current mode); no PROG-based current programming. | Preferred for digitally controlled power trees requiring dynamic voltage scaling or telemetry reporting. | Choose only if digital configuration and higher current are needed; not drop-in due to different pinout, control interface, and lack of analog current programming. |
Compared with LTC3114MPFE-1#PBF, the LTC3115EDHC-1#PBF offers identical functionality in a smaller DFN but sacrifices automotive qualification and extended temperature range, while the MAX20406AATL+ adds digital control at the cost of analog programmability and direct replacement feasibility.
Availability
LTC3114MPFE-1#PBF is available at Aetrix Electronics and suitable for automotive power systems, 12V/24V solar battery charging, high-power LED drivers, and 24V industrial power supplies requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LTC3114MPFE-1#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 is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving automotive, industrial, communications, and healthcare markets with precision, reliability, and innovation.
The LTC3114-1 product line delivers robust, wide-input buck-boost conversion for harsh environments-designed specifically for automotive under-hood, solar energy harvesting, and industrial control applications demanding extended temperature operation and high efficiency.
FAQ
What is the maximum junction temperature rating for the LTC3114MPFE-1#PBF?
The LTC3114MPFE-1#PBF is rated for a maximum junction temperature of 150°C and guaranteed to operate over –55°C to 150°C, meeting AEC-Q100 Grade MP requirements. This specification is validated through design, characterization, and statistical process controls-not just tested at extremes-and enables reliable deployment in under-hood automotive and high-ambient industrial settings where thermal derating is critical.
How does the PROG pin enable accurate average output current programming in the LTC3114MPFE-1#PBF?
The PROG pin on the LTC3114MPFE-1#PBF outputs a current proportional to switch D current at 40µA per ampere, allowing precise average output current setting via a single resistor to ground. With factory-trimmed gain and offset, the LTC3114MPFE-1#PBF achieves ±5% accuracy across temperature and line conditions-enabling reliable constant-current LED driving or battery charging without external sense resistors or amplifiers.
Can the LTC3114MPFE-1#PBF regulate output voltage when input voltage equals output voltage?
Yes, the LTC3114MPFE-1#PBF maintains seamless regulation when VIN = VOUT using its proprietary four-switch buck-boost topology. Unlike traditional SEPIC or flyback converters, it avoids discontinuous conduction mode or efficiency drops at unity ratio-delivering stable output with minimal ripple and no transient glitches during crossover, making it ideal for applications like 12V-to-12V regulation in automotive systems.
What is the purpose of the BST1 and BST2 pins on the LTC3114MPFE-1#PBF?
The BST1 and BST2 pins on the LTC3114MPFE-1#PBF serve as flying capacitor terminals for bootstrapping the gate drivers of internal N-channel MOSFETs SW1 and SW2. Each connects via a 68nF capacitor to its respective switch node to generate the elevated gate drive voltage required for full enhancement-ensuring low RDS(ON) operation and minimizing conduction losses across the entire input range.
Does the LTC3114MPFE-1#PBF support both Burst Mode and PWM operation, and how is mode selection implemented?
Yes, the LTC3114MPFE-1#PBF supports both Burst Mode and PWM operation. MODE pin voltage selects the primary mode: high (>0.9V) forces continuous 1.2MHz PWM; low (<0.5V) enables Burst Mode, which reduces no-load quiescent current to 30µA. At higher loads, it automatically transitions to PWM-eliminating manual intervention while optimizing efficiency across the full load range.
LTC3114MPFE-1#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-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):
- 2.2V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 2.7V
- Voltage - Output (Max):
- 40V
- Current - Output:
- 1A
- Frequency - Switching:
- 1.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP-EP
LTC3114MPFE-1#PBF FAQ
1.How can I place an order for LTC3114MPFE-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3114MPFE-1#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 LTC3114MPFE-1#PBF reliable?
The price and inventory of LTC3114MPFE-1#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3114MPFE-1#PBF is usually 5 days.
3.What payment methods are accepted for LTC3114MPFE-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3114MPFE-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3114MPFE-1#PBF?
LTC3114MPFE-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3114MPFE-1#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 LTC3114MPFE-1#PBF?
For technical support, including LTC3114MPFE-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3114MPFE-1#PBF requirements.
6.How does Aetrix verify that LTC3114MPFE-1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3114MPFE-1#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 LTC3114MPFE-1#PBF meets industry standards.
7.What is the process for return or replacement of LTC3114MPFE-1#PBF?
All LTC3114MPFE-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3114MPFE-1#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 LTC3114MPFE-1#PBF part is unused and in its original packaging.
Return procedure for LTC3114MPFE-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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