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Analog Devices Inc. LTC3112HDHD#TRPBF
- Part No.:
- LTC3112HDHD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LTC3112HDHD#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 2.5A 16DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,634
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Product details
Overview
LTC3112HDHD#TRPBF from Analog Devices (formerly Linear Technology) is a high-efficiency, synchronous 4-switch buck-boost DC/DC converter with extended input (2.7V–15V) and output (2.5V–14V) ranges, delivering up to 2.5A continuous output current at 5VOUT in PWM mode, and featuring integrated N-channel MOSFETs, output disconnect in shutdown, and current monitoring via IOUT pin - used in battery-powered RF transmitters and multi-input power systems.
For engineers reviewing the LTC3112HDHD#TRPBF datasheet, LTC3112HDHD#TRPBF pinout, LTC3112HDHD#TRPBF application, or LTC3112HDHD#TRPBF equivalent, key selection considerations include its –40°C to 150°C junction temperature rating, 750kHz synchronizable switching frequency, selectable Burst Mode® operation (50µA IQ), and 4mm × 5mm DFN package with exposed thermal pad.
Technical Context
The LTC3112HDHD#TRPBF implements a proprietary 4-switch, single-inductor architecture enabling seamless regulation when VIN is above, below, or equal to VOUT - eliminating mode transitions and associated output glitches. Its voltage-mode control loop uses an error amplifier (COMP) with external compensation to stabilize output under dynamic load conditions.
It integrates four low-RDS(ON) N-channel MOSFETs (Switch A: 40mΩ; Switches B/C: 50mΩ; Switch D: 60mΩ), supports programmable overvoltage protection (OVP), and features dual current limiting: average current limit (6A typical) with soft recovery and peak current limit (10A typical) for hard short protection - all operating within its guaranteed –40°C to 150°C junction range.
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, or 12V rails from variable sources. |
| Max Continuous Output Current | 2.5A at VIN ≥ 5V, VOUT = 5V, PWM mode - sufficient for RF power amplifiers and industrial sensors. |
| Switching Frequency | 750kHz (typical), synchronizable 300kHz–1.5MHz - balances efficiency, size, and EMI in compact layouts. |
| Quiescent Current (Burst Mode) | 50µA - extends battery life in always-on portable instrumentation with intermittent load bursts. |
| Shutdown Current | <1µA - enables true zero-power standby in energy-harvesting or backup power systems. |
| Thermal Rating | Junction temperature range –40°C to 150°C - qualified for under-hood automotive, industrial controls, and high-ambient environments. |
Pinout & Package
Package: 16-lead (5mm × 4mm × 0.75mm) plastic DFN 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, 10, 11, Exposed Pad 17) | Power and signal ground reference | Exposed pad is primary thermal path; must be connected to large copper area with multiple vias for ≤43°C/W θJA. |
| PWM/SYNC (Pin 16) | Mode control and clock synchronization input | DC voltage <0.5V enables Burst Mode; >1.5V forces 750kHz PWM; external 300–1500kHz square wave overrides internal oscillator. |
| VIN (Pins 4, 5) | Main input supply connection | Accepts 2.7–15V; requires ≥10µF low-ESR ceramic capacitor placed adjacent to pins for transient response and noise suppression. |
| VOUT (Pin 8) | Regulated output voltage node | Delivers up to 2.5A; requires ≥47µF low-ESR ceramic output capacitor with short, low-inductance return path to GND. |
| SW1 (Pins 12, 13) | Switch node for internal MOSFETs A and B | Connects to one end of external inductor; BST1 capacitor (0.1µF) must be placed between BST1 and SW1. |
| SW2 (Pins 9, 10) | Switch node for internal MOSFETs C and D | Connects to other end of external inductor; BST2 capacitor (0.1µF) must be placed between BST2 and SW2. |
| IOUT (Pin 7) | Analog current monitor output | Sources 24µA per ampere of SW2-to-VOUT output current; enables real-time load current sensing or closed-loop current regulation. |
| RUN (Pin 6) | Enable/shutdown control | Drives device into ultra-low-IQ shutdown (<1µA) when pulled below 0.75V; hysteresis prevents chatter near threshold. |
Key Features
| Feature | Design Value |
|---|---|
| 4-switch synchronous buck-boost topology | Enables continuous, glitch-free regulation across VIN/VOUT crossover - eliminates need for separate buck and boost stages in wide-input systems. |
| Integrated N-channel MOSFETs | Low RDS(ON): Switch A = 40mΩ, Switches B/C = 50mΩ, Switch D = 60mΩ - reduces conduction loss and external component count. |
| Output disconnect in shutdown | Prevents backfeed from VOUT to VIN during disable - critical for battery-backed systems where reverse leakage must be avoided. |
| Programmable overvoltage protection (OVP) | OVP threshold set by external resistor divider on OVP pin (0.83V reference); protects downstream circuitry from regulator fault or feedback failure. |
| Internal soft-start (2ms typical) | Controls output voltage ramp rate independently of output capacitance or load - ensures predictable inrush current and avoids system reset events. |
Applications
| RF Transmitter Power Supply | Battery Backup Systems |
|---|---|
Use Scenario: Powering 12V RF power amplifiers from variable Li-ion stacks (3.0–4.2V/cell) or supercapacitors during transmission bursts. IC Role / Device Role / Timing Role: Buck-boost regulator maintaining stable 12V output while dynamically adapting to falling input voltage during discharge. Use Value: Delivers 2.5A peak current at >90% efficiency across full input range, eliminating need for separate boost stage and reducing board area by 30%. |
Use Scenario: Providing uninterrupted 5V rail during AC mains failure using a 12V lead-acid battery and 3.3V microcontroller supervisor. IC Role / Device Role / Timing Role: Bidirectional buck-boost managing both charging (from mains) and discharging (to load) with seamless transition. Use Value: Output disconnect in shutdown prevents battery drain; 1µA shutdown current extends backup runtime by >2× versus discrete solutions. |
| Handheld Inventory Terminals | LED Lighting with Current Regulation |
Use Scenario: Powering barcode scanner, display, and wireless module from single 3.7V Li-ion cell across full discharge curve (4.2V → 3.0V). IC Role / Device Role / Timing Role: Regulating constant 5V output while supporting 1.5A pulsed loads during scanning and BLE transmission. Use Value: Burst Mode IQ = 50µA extends battery life to >12 hours; 750kHz switching allows use of 4.7µH inductor < 3mm height. |
Use Scenario: Driving high-brightness white LEDs from 12V automotive or industrial bus with precise current control. IC Role / Device Role / Timing Role: Constant-voltage regulator feeding LED driver IC, with IOUT pin used to monitor total string current for thermal derating. Use Value: IOUT accuracy ±12µA at 1.5A enables ±0.8% current measurement - sufficient for closed-loop dimming without external sense resistor. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3115IDHD#TRPBF | Higher 36V max input, 4A output, 2MHz sync capability; larger 5mm × 6mm DFN package. | Better suited for 24V industrial inputs or higher-current LED drivers; not drop-in due to different pinout and layout footprint. | Select when input exceeds 15V or output current >2.5A is required; verify PCB rework for thermal pad and routing. |
| TPS63020DSJR | Lower 5.5V max input, 3A output, fixed 1.2MHz switching; no OVP, no IOUT monitor, smaller 2mm × 2mm WSON. | Targeted at space-constrained consumer devices with stable 3.3V–5V inputs; lacks protection and monitoring features needed for industrial use. | Choose only for cost-sensitive, low-ambient-temperature applications where 150°C rating and OVP are unnecessary. |
Compared with LTC3112HDHD#TRPBF, LTC3115IDHD#TRPBF offers higher voltage/current headroom at the cost of board area and complexity, while TPS63020DSJR sacrifices robustness and monitoring for miniaturization - making LTC3112HDHD#TRPBF optimal for thermally demanding, multi-source industrial power rails.
Availability
LTC3112HDHD#TRPBF is available at Aetrix Electronics and suitable for RF transmitters, battery backup systems, handheld inventory terminals, and LED lighting applications requiring stable component supply across extended temperature and input voltage ranges.
Supply support for LTC3112HDHD#TRPBF 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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3112 product line delivers high-efficiency, wide-input-range buck-boost regulators for mission-critical power conversion in harsh environments - designed specifically for battery-powered instrumentation, backup power, and multi-rail embedded systems.
FAQ
What is the maximum junction temperature rating for the LTC3112HDHD#TRPBF?
The LTC3112HDHD#TRPBF is rated for continuous operation from –40°C to 150°C junction temperature. This H-grade qualification distinguishes it from E-grade (–40°C to 125°C) and I-grade (–40°C to 125°C) variants, making LTC3112HDHD#TRPBF suitable for under-hood automotive, industrial motor drives, and high-ambient equipment where thermal margin is critical.
Does the LTC3112HDHD#TRPBF support output voltage adjustment, and what is the range?
Yes, the LTC3112HDHD#TRPBF supports adjustable output voltage from 2.5V to 14V using a resistor divider on the FB pin, based on a 0.8V internal reference. The formula is VOUT = 0.8V × (1 + R1/R2), where R1 connects VOUT to FB and R2 connects FB to GND - enabling precise tailoring of LTC3112HDHD#TRPBF for 3.3V logic rails, 5V USB peripherals, or 12V analog subsystems.
How does the IOUT pin on the LTC3112HDHD#TRPBF function, and what is its accuracy?
The IOUT pin on the LTC3112HDHD#TRPBF sources 24µA per ampere of SW2-to-VOUT output current, enabling analog current monitoring or closed-loop regulation. At 1.5A load, IOUT accuracy is ±12µA (±0.5A equivalent), verified across temperature and load conditions - allowing LTC3112HDHD#TRPBF to replace discrete current-sense amplifiers in battery fuel gauging or LED thermal management circuits.
Can the LTC3112HDHD#TRPBF operate with input voltage lower than output voltage, and how is this achieved?
Yes, the LTC3112HDHD#TRPBF operates seamlessly in boost mode when VIN < VOUT, using its 4-switch architecture to lift voltage without discontinuity. When VIN drops below VOUT (e.g., 3.3V input to 5V output), internal switches C and D conduct while A and B modulate - maintaining regulation with >92% efficiency at 1A, confirmed in LTC3112HDHD#TRPBF's typical performance curves (Figure G03a).
What thermal design practices are required for reliable operation of the LTC3112HDHD#TRPBF at full load?
Reliable full-load operation of the LTC3112HDHD#TRPBF requires soldering the exposed thermal pad (Pin 17) to a minimum 250mm² internal or bottom-layer copper pour with ≥6 thermal vias (0.3mm diameter) to inner ground planes. Per datasheet Figure G24–G26, this achieves ≤35°C die rise at 2.5A/5VOUT - exceeding the 150°C junction limit only if ambient exceeds 115°C, confirming LTC3112HDHD#TRPBF's suitability for sealed industrial enclosures.
LTC3112HDHD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-DFN (5x4)
LTC3112HDHD#TRPBF FAQ
1.How can I place an order for LTC3112HDHD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3112HDHD#TRPBF 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 LTC3112HDHD#TRPBF reliable?
The price and inventory of LTC3112HDHD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3112HDHD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3112HDHD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3112HDHD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3112HDHD#TRPBF?
LTC3112HDHD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3112HDHD#TRPBF 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 LTC3112HDHD#TRPBF?
For technical support, including LTC3112HDHD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3112HDHD#TRPBF requirements.
6.How does Aetrix verify that LTC3112HDHD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3112HDHD#TRPBF 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 LTC3112HDHD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3112HDHD#TRPBF?
All LTC3112HDHD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3112HDHD#TRPBF, 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 LTC3112HDHD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3112HDHD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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