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Analog Devices Inc. LTC3112EDHD#PBF
- Part No.:
- LTC3112EDHD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LTC3112EDHD#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 2.5A 16DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,516
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Product details
Overview
LTC3112EDHD#PBF from Analog Devices (formerly Linear Technology) is a fixed-frequency synchronous buck-boost DC/DC converter with 4-switch single-inductor architecture, supporting 2.7V–15V input and 2.5V–14V output ranges, delivering up to 2.5A continuous output current at 5VOUT in PWM mode, and used in battery-powered RF transmitters and multi-source power systems.
For engineers reviewing the LTC3112EDHD#PBF datasheet, LTC3112EDHD#PBF pinout, LTC3112EDHD#PBF application, or LTC3112EDHD#PBF equivalent, key selection criteria include seamless VIN-above/below/equal-VOUT regulation, 750kHz synchronizable switching, internal N-channel MOSFETs with 40–60mΩ RDS(ON), output current monitoring via IOUT pin, and thermal performance on DFN package with exposed pad.
Technical Context
The LTC3112EDHD#PBF implements a proprietary voltage-mode control algorithm with integrated error amplifier and COMP-based loop compensation, enabling smooth transitions between buck, buck-boost, and boost modes without inductor current discontinuity. Its 4-switch topology uses internal A/B/C/D N-MOSFETs driven by dedicated BST1/BST2 floating supplies.
It features dual current limiting: an average current limit (6A typical) acting through FB injection and a fast peak limit (~10A) for hard short protection, plus reverse current limiting (–1A typical) on SW2/VOUT path during fixed-frequency operation - all thermally derated above 125°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 15V - supports single/multi-cell Li-ion, backup capacitors, and wall adapters without external pre-regulation. |
| Output Voltage Range | 2.5V to 14V - adjustable via FB resistor divider; enables 3.3V/5V/12V rails from variable sources. |
| Continuous Output Current | 2.5A at VIN ≥ 5V, VOUT = 5V, PWM mode - sufficient for RF power stages and LED drivers. |
| Switching Frequency | 750kHz nominal, synchronizable 300kHz–1.5MHz - allows EMI optimization and inductor size reduction. |
| Efficiency | Up to 95% - achieved using low-RDS(ON) internal MOSFETs (40–60mΩ) and optimized gate drive. |
| Quiescent Current | 50µA in Burst Mode, <1µA in shutdown - extends battery life in always-on or low-duty-cycle systems. |
| Thermal Limit | Junction temperature shutdown at ~170°C, restart at ~160°C - protects against sustained overload or poor PCB thermal design. |
Pinout & Package
The LTC3112EDHD#PBF is housed in a 16-lead (5mm × 4mm × 0.75mm) plastic DFN package with exposed thermal pad (Pin 17), requiring soldering to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 17) | Power & signal ground reference | Exposed pad (Pin 17) must be soldered to PCB ground plane; primary thermal path and low-impedance return for high-current switches. |
| VIN (Pins 4, 5) | Main input supply connection | Bypassed with ≥10µF low-ESR ceramic capacitor; supports wide input range (2.7V–15V) and powers internal circuitry via VCC clamp. |
| VOUT (Pin 8) | Regulated output voltage node | Connected to ≥47µF low-ESR output capacitor; delivers up to 2.5A with tight regulation across buck/boost transitions. |
| SW1 (Pins 12, 13) | Switch node for internal A/B MOSFETs | Connects to one end of external inductor; driven by BST1-supplied gate driver; handles high di/dt during buck operation. |
| SW2 (Pins 9, 10) | Switch node for internal C/D MOSFETs | Connects to other end of external inductor; driven by BST2-supplied gate driver; enables reverse current limiting and boost conduction. |
| IOUT (Pin 7) | Analog current monitor output | Sources 24µA/A of SW2 output current; enables precise load current measurement or programmable current limiting with RC network. |
| FB (Pin 2) | Feedback voltage input | Resistor divider from VOUT sets output voltage per VOUT = 0.8V × (1 + R1/R2); referenced to 0.8V internal bandgap. |
| RUN (Pin 6) | Enable/shutdown control | Logic-high (>0.75V) enables operation; <0.35V disables converter and reduces quiescent current to <1µA. |
Key Features
| Feature | Design Value |
|---|---|
| Seamless buck-boost regulation | Maintains regulated VOUT whether VIN is above, below, or equal to VOUT - eliminates need for separate buck/boost converters in multi-battery systems. |
| Internal MOSFETs with low RDS(ON) | 40mΩ (Switch A), 50mΩ (Switches B/C), 60mΩ (Switch D) - minimizes conduction loss and enables >95% efficiency at full load. |
| Programmable operating mode | Selectable PWM (full current capability) or Burst Mode (50µA IQ) via PWM/SYNC pin - balances efficiency vs. output ripple for varying load profiles. |
| Output disconnect in shutdown | Internal switches isolate VOUT from VIN and SW nodes when RUN = low - prevents backfeed and ensures true load isolation. |
| Integrated overvoltage protection | OVP pin accepts resistor divider to set trip threshold down to 0.83V × (1 + R3/R4); provides independent safeguard against regulator failure or feedback fault. |
Applications
| Handheld RF Transmitter Power | Multi-Source Backup System |
|---|---|
|
Use Scenario: Portable UHF/VHF radio with Li-ion battery (3.0–4.2V) powering 5V RF PA stage requiring stable voltage despite battery sag. IC Role / Device Role / Timing Role: Buck-boost regulator maintaining 5V output across full battery discharge curve while sourcing up to 2.5A peak current. Use Value: Eliminates need for separate LDO or boost converter; enables compact layout with single inductor and no input pre-regulator. |
Use Scenario: Industrial sensor node powered by either 12V wall adapter or supercapacitor bank (2.5–10V) during mains outage. IC Role / Device Role / Timing Role: Seamless source-agnostic regulator delivering constant 3.3V or 5V to MCU and wireless SoC regardless of input source voltage or polarity shift. Use Value: Ensures uninterrupted operation during source switchover; avoids brownout resets and supports cold-start from depleted backup cap. |
| LED Current-Regulated Driver | 12V Lead-Acid to 12V Stabilized Rail |
|
Use Scenario: Automotive interior lighting using 12V battery (9–16V) to drive constant-current LED string with dimming interface. IC Role / Device Role / Timing Role: Buck-boost controller with IOUT pin feeding op-amp current sense loop; regulates LED current independent of input variation or forward voltage drift. Use Value: Achieves ±2% current accuracy across temperature; replaces discrete current mirror + linear regulator with higher efficiency and smaller footprint. |
Use Scenario: Telematics unit requiring clean, ripple-free 12V rail from aging lead-acid battery (10.5–14.8V) with sulfation-induced voltage instability. IC Role / Device Role / Timing Role: Bidirectional buck-boost maintaining regulated 12V output even when input drops below 12V (e.g., cranking) or surges above (e.g., alternator spike). Use Value: Prevents system reset during engine start; tolerates ±2.3V input deviation without output droop or overvoltage damage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2918GQ-Z | 4-switch architecture, 2.5A max, 2.5V–16V input, but only 0.8V–6V output range; no IOUT monitor pin. | Limited to low-voltage outputs; unsuitable for 12V systems or current-sense-critical designs. | Choose MP2918GQ-Z only if output ≤6V and current monitoring is unnecessary. |
| TPS63020DSJR | 4-switch buck-boost, 3A max, 1.8V–5.5V input, 1.2V–5.5V output; integrated compensation; no OVP or reverse current limit. | Restricted to low-input, low-output applications; lacks protection features critical for industrial backup systems. | Prefer TPS63020DSJR for space-constrained consumer devices with narrow voltage windows and no safety-critical requirements. |
Compared with MP2918GQ-Z and TPS63020DSJR, the LTC3112EDHD#PBF uniquely supports 2.5V–14V output with integrated OVP, reverse current limiting, and analog current monitoring - making it the only option among the three qualified for 12V industrial backup and RF transmitter applications demanding full-range regulation and robust fault protection.
Availability
LTC3112EDHD#PBF is available at Aetrix Electronics and suitable for handheld RF transmitters, multi-source backup systems, LED current-regulated drivers, and 12V lead-acid stabilized rails requiring stable component supply across extended temperature and voltage ranges.
Supply support for LTC3112EDHD#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 and maintains its legacy of high-performance power management ICs with rigorous automotive and industrial qualification standards.
The LTC3112 product line targets high-reliability, wide-input-range DC/DC conversion in battery-backed, RF, and multi-rail industrial systems - emphasizing seamless mode transition, thermal robustness, and integrated protection.
FAQ
What is the maximum continuous output current of the LTC3112EDHD#PBF?
The LTC3112EDHD#PBF delivers up to 2.5A continuous output current when VIN ≥ 5V and VOUT = 5V in PWM mode. This rating assumes proper thermal design using the exposed pad and 4-layer PCB per the demo board layout. At higher ambient temperatures or reduced copper area, derating applies per the die temperature rise curves in the datasheet.
Does the LTC3112EDHD#PBF support output voltages above 5V?
Yes, the LTC3112EDHD#PBF supports output voltages from 2.5V to 14V, set via the FB resistor divider using VOUT = 0.8V × (1 + R1/R2). It has been validated at 12V output in applications like lead-acid battery stabilization and synchronous boost conversion, maintaining regulation and efficiency across the full input range.
How does the IOUT pin function on the LTC3112EDHD#PBF?
The IOUT pin on the LTC3112EDHD#PBF sources 24µA per ampere of SW2 output current, enabling precise analog current monitoring or programmable current limiting. When paired with a 42.2kΩ resistor and 100pF capacitor, it produces 1V per ampere at the IOUT node - a configuration verified in the typical application circuit and performance graphs.
Can the LTC3112EDHD#PBF operate with input voltage lower than output voltage?
Yes, the LTC3112EDHD#PBF is specifically designed for seamless operation when VIN < VOUT (boost mode), VIN > VOUT (buck mode), or VIN ≈ VOUT (buck-boost mode). Its 4-switch architecture ensures continuous inductor current and stable regulation without mode-hopping artifacts or output glitches.
What thermal considerations apply to the LTC3112EDHD#PBF in a 16-pin DFN package?
The LTC3112EDHD#PBF requires soldering of its exposed thermal pad (Pin 17) to a PCB ground plane with multiple thermal vias. Thermal resistance is θJA = 43°C/W on a 4-layer demo board; exceeding 125°C junction temperature triggers linear current limit derating, and >170°C initiates thermal shutdown. Layout adherence to Linear's AN133 guidelines is essential for rated performance.
LTC3112EDHD#PBF 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):
- 2.7V
- Voltage - Input (Max):
- 15V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- 14V
- Current - Output:
- 2.5A
- Frequency - Switching:
- 750kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-DFN (5x4)
LTC3112EDHD#PBF FAQ
1.How can I place an order for LTC3112EDHD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3112EDHD#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 LTC3112EDHD#PBF reliable?
The price and inventory of LTC3112EDHD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3112EDHD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3112EDHD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3112EDHD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3112EDHD#PBF?
LTC3112EDHD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3112EDHD#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 LTC3112EDHD#PBF?
For technical support, including LTC3112EDHD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3112EDHD#PBF requirements.
6.How does Aetrix verify that LTC3112EDHD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3112EDHD#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 LTC3112EDHD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3112EDHD#PBF?
All LTC3112EDHD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3112EDHD#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 LTC3112EDHD#PBF part is unused and in its original packaging.
Return procedure for LTC3112EDHD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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