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Analog Devices Inc. LTC3114IDHC-1#WPBF
- Part No.:
- LTC3114IDHC-1#WPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LTC3114IDHC-1#WPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 1A 16DFN
- Quantity:
- Payment:
- Shipping:
Inventory:156
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Product details
Overview
LTC3114IDHC-1#WPBF from Analog Devices is a 40V, 1A synchronous buck-boost DC/DC converter with programmable average output current, current-mode control, and 1.2MHz fixed-frequency PWM operation. It regulates VOUT above, below, or equal to VIN (2.2V–40V), delivers up to 96% efficiency, and supports automotive-grade operation (–40°C to 125°C) in a thermally enhanced 16-lead 3mm × 5mm DFN package. Used in 12V/24V solar battery charging and high-power LED drivers.
For engineers reviewing the LTC3114IDHC-1#WPBF datasheet, LTC3114IDHC-1#WPBF pinout, LTC3114IDHC-1#WPBF application, or LTC3114IDHC-1#WPBF equivalent, this page provides verified specifications including programmable output current (via PROG pin), accurate RUN threshold (1.205V typ), Burst Mode quiescent current (30µA), integrated N-channel switch RDS(ON) (250mΩ), and LDO/PLDO dual-rail support for gate drive and biasing.
Technical Context
The LTC3114IDHC-1#WPBF implements a four-switch synchronous buck-boost topology with internal N-channel DMOS power switches (A–D), enabling seamless mode transitions without subharmonic oscillation or output transients. Its proprietary current-mode PWM controller uses an internal 1.2MHz oscillator and integrates soft-start, overtemperature protection, short-circuit protection, and accurate RUN pin UVLO with 140mV hysteresis.
Programmable average output current is implemented via the PROG pin, where a resistor-to-ground sets IOUT(AVG) with ±5% typical accuracy across temperature. The device supports bootstrapped LDO/PLDO operation (4.4V nominal) to reduce no-load IQ to 30µA and includes dedicated BST1/BST2 flying capacitor pins for high-side gate drive in both buck and boost modes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.2V to 40V - supports wide-input industrial, automotive, and solar systems without pre-regulation. |
| VOUT Range | 2.7V to 40V - enables single-inductor regulation above or below input, e.g., 12V lead-acid to 5V or 3.6V Li-ion to 12V. |
| Max Output Current | 1A in buck mode - sufficient for high-brightness LED strings or 5V/1A system rails. |
| Switching Frequency | 1.2MHz (typ) - allows compact 6.8µH inductor and low-profile ceramic capacitors. |
| Quiescent Current | 30µA in Burst Mode (bootstrapped) - extends battery life in always-on automotive sensors. |
| PROG Gain Accuracy | 40µA/A ±5% - enables precise constant-current programming for LED driver or battery charge applications. |
| Thermal Rating | –40°C to 125°C junction - qualified per AEC-Q100 for under-hood automotive use. |
| Package | 16-lead 3mm × 5mm × 0.75mm DFN with exposed PGND pad - θJA = 43°C/W (4-layer board) for reliable 1W+ dissipation. |
Pinout & Package
Package: 16-lead plastic DFN (3mm × 5mm, 0.75mm height), exposed thermal pad (Pin 17) tied to PGND. Requires soldering of exposed pad to PCB ground plane for rated thermal performance (θJC = 4°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (Pins 1, 17) | Power Ground Reference | Primary return path for high-current switches SW1/SW2 and LDO/PLDO; exposed pad must be soldered for thermal integrity. |
| SW1 (Pin 15), SW2 (Pin 2) | Buck-Boost Inductor Nodes | Connect to opposite ends of single inductor; SW1 interfaces with PVIN, SW2 with PVOUT - defines 4-switch topology. |
| PVIN (Pin 14), PVOUT (Pin 3) | Main Power Input/Output Terminals | High-current paths requiring ≥10µF low-ESR ceramic capacitors placed adjacent to pins with direct PGND vias. |
| RUN (Pin 4) | Enable & UVLO Control Input | Accurate 1.205V turn-on threshold with 140mV hysteresis - enables custom input undervoltage lockout for battery cutoff. |
| PROG (Pin 5) | Output Current Sense & Programming Node | Sinks current proportional to switch D current (ISWD/25000); sets average IOUT via external resistor (e.g., 25kΩ → 1A). |
| VC (Pin 6) | Error Amplifier Output | Requires external compensation network (RZ, CP1, CP2) between VC and GND to stabilize voltage loop. |
| FB (Pin 7) | Feedback Voltage Input | 1.0V nominal reference - VOUT = 1V × (1 + RTOP/RBOT) - sensitive to noise; requires short, shielded trace routing. |
| LDO/PLDO (Pins 9, 11) | Internal Bias Rail Supply/Output | 4.4V LDO powers control circuitry; PLDO supplies gate drivers - must be shorted together and bypassed with ≥4.7µF. |
| BST1 (Pin 13), BST2 (Pin 12) | Flying Capacitor Connections | Drive gate drivers for high-side switches A and D via 68nF capacitors - traces must be short and low-inductance. |
| MODE (Pin 16) | Operating Mode Select | Logic-high = forced PWM (1.2MHz); logic-low = Burst Mode (30µA IQ) with automatic transition to PWM at higher loads. |
Key Features
| Feature | Design Value |
|---|---|
| Four-switch synchronous buck-boost topology | Enables single-inductor VOUT regulation across full VIN range without polarity reversal or external diodes. |
| Programmable average output current | ±5% accuracy over –40°C to 125°C using single resistor on PROG pin - eliminates external current-sense ICs in LED/battery apps. |
| 1.2MHz fixed-frequency PWM with Burst Mode | Reduces EMI filtering burden while achieving 30µA no-load IQ - ideal for always-on automotive modules. |
| Integrated 4.4V LDO/PLDO with bootstrapping | Allows PLDO to be powered from regulated VOUT, cutting quiescent current by >50% versus non-bootstrapped operation. |
| AEC-Q100 qualified (Grade I) | Validated for automotive applications including engine control, ADAS sensors, and infotainment power rails. |
| Accurate RUN pin with hysteresis | 1.205V ±20mV threshold and 140mV hysteresis - enables precise battery undervoltage disconnect without external comparators. |
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 controller maintaining constant-current/constant-voltage charge profile with programmable ICHG via PROG pin. Use Value: Eliminates need for separate MPPT controller and DC/DC stage - single-chip solution reduces BOM cost and PCB area by >30%. | Use Scenario: Converting unregulated 12V vehicle battery to stable 5V/1A for USB-C accessories or telematics modules. IC Role / Device Role / Timing Role: Wide-input buck-boost regulator operating from cold-crank (4.5V) to load-dump (40V) conditions with seamless mode transitions. Use Value: Maintains uninterrupted 5V supply during engine start-stop cycles - prevents data loss in GPS/loggers without supercap backup. |
| High Power LED Driver | 24V Industrial Power Supply |
Use Scenario: Driving 3–5 high-brightness white LEDs (9–18V forward) from 12V or 24V rail in commercial lighting fixtures. IC Role / Device Role / Timing Role: Constant-current source with analog dimming via VC pin and thermal foldback protection. Use Value: Delivers 1A LED current with <1% ripple in PWM mode - meets flicker-sensitive requirements for retail and medical lighting. | Use Scenario: Providing isolated 24V-to-24V regulation in factory automation PLCs where input may sag to 18V during motor startup. IC Role / Device Role / Timing Role: Non-isolated buck-boost regulator sustaining 24V output despite 18–40V input variation and 1A load steps. Use Value: Replaces discrete buck+boost combo - reduces component count by 12 parts and improves transient response time by 3×. |
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 pinout, 40V/2A rating, higher current capability, but only rated to 125°C (not automotive qualified). | Preferred for industrial 2A loads; lacks AEC-Q100 qualification and #W suffix for automotive use. | Select when >1A output current is required and automotive qualification is not mandatory. |
| MP2491DJ-LF-Z | 36V/1.5A buck-boost, 500kHz switching, no programmable current limit, no integrated LDO, smaller 2mm × 2mm QFN. | Suitable for space-constrained consumer devices; lacks PROG-based current programming and automotive temp grade. | Choose for cost-sensitive, non-automotive designs where 1.2MHz noise immunity is less critical. |
Compared with LTC3115EDHC-1#PBF and MP2491DJ-LF-Z, the LTC3114IDHC-1#WPBF uniquely combines AEC-Q100 qualification, precise programmable current limiting, and integrated LDO/PLDO biasing - making it the only option among the three validated for automotive battery charging and LED headlamp drivers.
Availability
LTC3114IDHC-1#WPBF is available at Aetrix Electronics and suitable for automotive power systems, 12V/24V solar panel battery charging, high-power LED drivers, and 24V industrial power supplies requiring stable component supply and long-term lifecycle support.
Supply support for LTC3114IDHC-1#WPBF 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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3114-1 product line delivers robust, wide-input buck-boost regulators with programmable current limiting and automotive qualification - designed specifically for harsh-environment power conversion in vehicles, renewable energy systems, and industrial controls.
FAQ
What is the maximum continuous output current of the LTC3114IDHC-1#WPBF in buck mode?
The LTC3114IDHC-1#WPBF delivers up to 1A continuous output current in buck mode, as specified in the datasheet under "1A Output Current in Buck Mode" and confirmed by the 1.7A typical inductor current limit. This rating holds across the full –40°C to 125°C operating junction temperature range when used with proper thermal design (exposed PGND pad soldered, 4-layer board).
How does the PROG pin enable programmable output current in the LTC3114IDHC-1#WPBF?
The PROG pin on the LTC3114IDHC-1#WPBF sinks a current proportional to switch D current (ISWD/25000). Connecting a resistor RPROG from PROG to GND generates a voltage VPROG = ISWD × RPROG/25000. Setting RPROG = 25kΩ yields 1V at PROG for 1A average output current, enabling ±5% accurate constant-current regulation without external sense resistors or amplifiers.
Is the LTC3114IDHC-1#WPBF pin-compatible with other variants in the LTC3114-1 family?
Yes, the LTC3114IDHC-1#WPBF shares identical pinout, footprint, and electrical interface with all DFN-packaged LTC3114-1 variants (e.g., LTC3114EDHC-1#PBF, LTC3114HDHC-1#PBF). Differences are limited to temperature grade (I-grade = –40°C to 125°C), automotive qualification (#WPBF suffix), and minor parametric shifts - allowing drop-in replacement within same package type.
What is the purpose of the LDO and PLDO pins on the LTC3114IDHC-1#WPBF?
The LDO (Pin 9) and PLDO (Pin 11) pins on the LTC3114IDHC-1#WPBF form a dual-rail bias system: LDO supplies internal control circuitry at 4.4V, while PLDO powers the high-side gate drivers. They must be shorted together and bypassed with ≥4.7µF to GND. Bootstrapping PLDO to VOUT reduces no-load IQ to 30µA - a key feature of the LTC3114IDHC-1#WPBF for automotive standby efficiency.
Does the LTC3114IDHC-1#WPBF support true seamless mode transitions between buck and boost?
Yes, the LTC3114IDHC-1#WPBF uses a proprietary four-switch control algorithm that ensures seamless transitions between buck, boost, and buck-boost modes - with no output voltage glitches, subharmonic oscillation, or discontinuities in inductor current. This is explicitly documented in the "OPERATION" section and validated in Figure 1's power stage schematic and transient test waveforms (G28–G33).
LTC3114IDHC-1#WPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFDFN 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:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-DFN (5x3)
LTC3114IDHC-1#WPBF FAQ
1.How can I place an order for LTC3114IDHC-1#WPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3114IDHC-1#WPBF 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 LTC3114IDHC-1#WPBF reliable?
The price and inventory of LTC3114IDHC-1#WPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3114IDHC-1#WPBF is usually 5 days.
3.What payment methods are accepted for LTC3114IDHC-1#WPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3114IDHC-1#WPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3114IDHC-1#WPBF?
LTC3114IDHC-1#WPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3114IDHC-1#WPBF 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 LTC3114IDHC-1#WPBF?
For technical support, including LTC3114IDHC-1#WPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3114IDHC-1#WPBF requirements.
6.How does Aetrix verify that LTC3114IDHC-1#WPBF is sourced from the original manufacturer or authorized distributors?
All LTC3114IDHC-1#WPBF 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 LTC3114IDHC-1#WPBF meets industry standards.
7.What is the process for return or replacement of LTC3114IDHC-1#WPBF?
All LTC3114IDHC-1#WPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3114IDHC-1#WPBF, 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 LTC3114IDHC-1#WPBF part is unused and in its original packaging.
Return procedure for LTC3114IDHC-1#WPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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