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Analog Devices Inc. LTC3112IDHD#TRPBF
- Part No.:
- LTC3112IDHD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LTC3112IDHD#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 2.5A 16DFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC3112IDHD#TRPBF from Analog Devices (formerly Linear Technology) is a fixed-frequency synchronous buck-boost DC/DC converter with 4-switch single-inductor architecture, supporting input voltages from 2.7V to 15V and regulated output voltages from 2.5V to 14V. It delivers up to 2.5A continuous output current at 5VOUT (VIN ≥ 5V, PWM mode), features integrated N-channel MOSFETs with RDS(ON) as low as 40 mΩ, and operates at 750 kHz with external synchronization capability. It is used in battery-powered RF transmitters requiring seamless VIN-to-VOUT regulation across varying cell counts.
For engineers reviewing the LTC3112IDHD#TRPBF datasheet, LTC3112IDHD#TRPBF pinout, LTC3112IDHD#TRPBF application, or LTC3112IDHD#TRPBF equivalent, key selection criteria include its wide-input/wide-output voltage range, output current monitoring via IOUT pin (24 µA/A), selectable PWM/Burst Mode operation, and thermal performance in the 16-pin DFN package with exposed ground pad.
Technical Context
The LTC3112IDHD#TRPBF implements a proprietary 4-switch buck-boost topology enabling continuous conduction mode operation regardless of whether 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 regulate output via FB pin, while internal drivers manage high-side and low-side N-MOSFETs (Switches A–D) with adaptive gate drive timing.
It integrates dual bootstrap supplies (BST1, BST2) for floating high-side gate drive, supports output disconnect in shutdown, and includes dedicated circuits for overvoltage protection (OVP), reverse current limiting (−1 A typical), and thermal shutdown at ~170°C with automatic restart at ~160°C. The RUN pin enables precise system-level power sequencing with <1 µA shutdown current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 15V - supports single/dual/triple Li-ion, backup capacitors, or wall adapters without input pre-regulation. |
| Output Voltage Range | 2.5V to 14V - adjustable via resistor divider on FB pin; enables direct 3.3V, 5V, or 12V generation from variable sources. |
| Continuous Output Current | 2.5A at 5VOUT, VIN ≥ 5V, PWM mode - sufficient for RF PA biasing or multi-rail portable systems. |
| Switching Frequency | 750 kHz (fixed), synchronizable 300 kHz–1.5 MHz - balances efficiency, EMI, and inductor size; supports noise-sensitive applications. |
| Efficiency | Up to 95% - achieved using low-RDS(ON) internal N-MOSFETs (40–60 mΩ) and optimized gate drive. |
| Quiescent Current | 50 µA in Burst Mode, <1 µA in shutdown - extends battery life in always-on or low-duty-cycle systems. |
| Output Current Monitoring | IOUT pin sources 24 µA per ampere of SW2-to-VOUT current - enables analog current limiting or telemetry without sense resistor. |
Pinout & Package
Package: 16-lead (5 mm × 4 mm × 0.75 mm) plastic DFN with exposed GND pad (Pin 17), rated for –40°C to +125°C junction temperature. Thermal resistance θJA = 43°C/W; requires PCB vias under exposed pad for reliable heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 17) | Power and signal ground reference | Exposed pad (Pin 17) is primary thermal path; must be soldered to large copper plane with multiple thermal vias. |
| VIN (Pins 4, 5) | Main input supply connection | Bypass with ≥10 µF low-ESR ceramic capacitor placed adjacent to pins; critical for stability under high di/dt. |
| VOUT (Pin 8) | Regulated output voltage node | Requires ≥47 µF low-ESR ceramic output capacitor; short, low-inductance layout essential for ripple suppression. |
| SW1 (Pins 12, 13) | Switch node for internal MOSFETs A and B | Connects to one end of external inductor; high dv/dt node - minimize trace area and coupling to sensitive signals. |
| SW2 (Pins 9, 10) | Switch node for internal MOSFETs C and D | Connects to other end of external inductor; same layout constraints as SW1 for EMI control. |
| BST1 (Pin 14) | Floating supply for high-side driver of Switch A | Requires 0.1 µF ceramic capacitor to SW1; ensures robust gate drive during buck operation. |
| BST2 (Pin 11) | Floating supply for high-side driver of Switch D | Requires 0.1 µF ceramic capacitor to SW2; maintains gate drive integrity during boost operation. |
| FB (Pin 2) | Feedback voltage input | Resistor divider sets VOUT = 0.8 V × (1 + R1/R2); precision reference enables ±1.5% output regulation. |
| OVP (Pin 3) | Overvoltage protection input | Programmable OVP threshold (0.83 V reference) protects downstream circuitry if VOUT exceeds safe limit. |
| RUN (Pin 6) | Enable/shutdown control | Logic-high (>0.75 V) enables operation; logic-low (<0.35 V) disables converter and reduces IQ to <1 µA. |
| IOUT (Pin 7) | Current monitor output | Sources 24 µA per ampere of load current - allows real-time current sensing or closed-loop current limiting. |
| PWM/SYNC (Pin 16) | Mode selection and frequency sync | <0.5 V = Burst Mode; >1.5 V = PWM mode; 300–1500 kHz square wave overrides internal oscillator. |
| COMP (Pin 1) | Error amplifier output | External RC network between COMP and FB sets loop compensation; determines transient response and stability. |
| VCC (Pin 15) | Internal regulator supply | Clamped at 4.2 V; powers internal circuitry and gate drivers - bypass with 1 µF ceramic capacitor to GND. |
Key Features
| Feature | Design Value |
|---|---|
| 4-switch synchronous buck-boost topology | Enables seamless regulation across VIN/VOUT crossover without discontinuity or output glitch - critical for stable RF bias rails. |
| Integrated N-channel MOSFETs (40–60 mΩ) | Eliminates external power switches and gate drivers; reduces BOM count and layout complexity while maximizing efficiency. |
| Output disconnect in shutdown | Prevents backfeed from VOUT to VIN during disable - protects upstream sources like batteries or supercaps. |
| Programmable overvoltage protection (OVP) | Configurable OVP threshold (via resistor divider on OVP pin) adds fail-safe layer for sensitive loads such as ADC references or sensors. |
| Internal soft-start (2 ms typical) | Controls inrush current during startup; ensures monotonic VOUT rise independent of output capacitance or load. |
| Reverse current limiting (−1 A typical) | Disables Switch D when reverse current exceeds threshold - prevents damage during VOUT > VIN fault conditions. |
Applications
| RF Transmitter Power Supply | Multi-Cell Li-ion Backup System |
|---|---|
|
Use Scenario: Portable UHF RFID reader with 3.3V digital core and 5V RF power amplifier powered from 2-cell Li-ion (6–8.4V). IC Role / Device Role / Timing Role: Buck-boost regulator maintaining stable 5V output despite battery discharge from 8.4V down to 6V, then boosting to 5V as voltage drops below 5V. Use Value: Eliminates need for separate buck and boost converters; reduces board space and improves efficiency over discrete solutions. |
Use Scenario: Industrial sensor node with supercapacitor backup that must sustain 3.3V operation during main power loss. IC Role / Device Role / Timing Role: Regulates 3.3V output from supercapacitor stack discharging from 5.5V to 2.7V, providing uninterrupted power during brownout. Use Value: Maintains clean, regulated rail without voltage sag or dropout - preserves data integrity in nonvolatile memory and RTC. |
| Handheld Inventory Terminal | LED Lighting with Current Regulation |
|
Use Scenario: Rugged barcode scanner powered by removable 3-cell Li-ion pack (9–12.6V), requiring 5V for imaging engine and 3.3V for MCU. IC Role / Device Role / Timing Role: Primary 5V buck-boost stage feeding secondary LDOs; handles full input range while delivering 2.5A peak for flash illumination. Use Value: Supports extended runtime across full battery voltage range without manual reconfiguration or firmware intervention. |
Use Scenario: Automotive interior LED strip powered from 12V lead-acid battery with cold-cranking dips to 6V and load-dump spikes to 16V. IC Role / Device Role / Timing Role: Constant-current LED driver using IOUT pin feedback to regulate LED string current independent of input fluctuations. Use Value: Enables precise current control without external sense resistor - improves thermal performance and simplifies layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8390AEMSE#TRPBF | Higher 60V input rating, 3.5A output, spread-spectrum EMI reduction; larger 16-lead MSOP package. | Better suited for automotive 12V/24V systems with load dump; less optimal for compact portable designs due to size and cost. | Select LT8390A when input may exceed 15V or EMI compliance is critical; LTC3112IDHD#TRPBF preferred for space-constrained 2.7–15V applications. |
| TPS63020DSJR | Lower 0.5A output current, 3.5V–15.5V input, no IOUT monitor pin, smaller 10-pin WSON package. | Targeted at ultra-low-power wearables; lacks current monitoring and high-current capability needed for RF or industrial use. | Choose TPS63020DSJR only for sub-1A, cost-sensitive consumer devices; LTC3112IDHD#TRPBF remains superior for 2.5A+ and telemetry-enabled designs. |
Compared with LT8390AEMSE#TRPBF and TPS63020DSJR, the LTC3112IDHD#TRPBF uniquely balances 2.5A output, integrated current monitoring, compact DFN footprint, and seamless buck-boost operation across 2.7–15V - making it optimal for mid-power portable and industrial systems where size, accuracy, and wide input range are jointly critical.
Availability
LTC3112IDHD#TRPBF is available at Aetrix Electronics and suitable for RF transmitter power supplies, handheld inventory terminals, and multi-cell Li-ion backup systems requiring stable component supply, long-term lifecycle support, and guaranteed −40°C to +125°C operation.
Supply support for LTC3112IDHD#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 acquired Linear Technology in 2017 and maintains its high-performance power management portfolio with rigorous qualification and long-term product support.
The LTC3112 belongs to Linear's high-efficiency synchronous buck-boost regulator family, designed specifically for applications demanding seamless regulation across wide input/output voltage ranges - especially in battery-powered, portable, and industrial systems where reliability and thermal performance are critical.
FAQ
What is the operating temperature range for the LTC3112IDHD#TRPBF?
The LTC3112IDHD#TRPBF is specified for operation from −40°C to +125°C junction temperature. This industrial-grade rating ensures reliable performance in demanding environments such as handheld scanners, industrial sensors, and automotive auxiliary systems. The device includes thermal shutdown at ~170°C with automatic recovery at ~160°C to protect against sustained overload conditions.
Does the LTC3112IDHD#TRPBF support output current monitoring, and how is it implemented?
Yes, the LTC3112IDHD#TRPBF provides analog output current monitoring via the IOUT pin, which sources 24 µA per ampere of SW2-to-VOUT current. This enables real-time load current measurement or closed-loop current limiting without an external sense resistor. For example, with a 42.2 kΩ resistor to ground, IOUT generates 1 V per ampere - directly compatible with most ADC inputs or op-amp comparators.
Can the LTC3112IDHD#TRPBF operate with input voltage lower than the output voltage?
Yes, the LTC3112IDHD#TRPBF is explicitly designed for buck-boost operation and regulates its output seamlessly whether VIN is above, below, or equal to VOUT. Its 4-switch architecture eliminates mode transitions, ensuring continuous conduction and stable output even as input voltage crosses the output setpoint - a key advantage over traditional buck-only or boost-only regulators.
What package type and thermal considerations apply to the LTC3112IDHD#TRPBF?
The LTC3112IDHD#TRPBF uses a 16-lead 5 mm × 4 mm plastic DFN package with an exposed GND pad (Pin 17). Effective thermal management requires soldering this pad to a large PCB copper plane using multiple thermal vias. With θJA = 43°C/W, proper layout keeps junction temperature within limits - especially under 2.5A loads at high ambient temperatures or elevated input/output differentials.
How does the LTC3112IDHD#TRPBF handle shutdown and output disconnect?
When the RUN pin is pulled below 0.35 V, the LTC3112IDHD#TRPBF enters shutdown with <1 µA quiescent current and actively disconnects VOUT from VIN using internal switches. This prevents backfeed from the output capacitor or load into the input source - essential for battery-powered systems where leakage could drain cells during standby or storage.
LTC3112IDHD#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-DFN (5x4)
LTC3112IDHD#TRPBF FAQ
1.How can I place an order for LTC3112IDHD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3112IDHD#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 LTC3112IDHD#TRPBF reliable?
The price and inventory of LTC3112IDHD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3112IDHD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3112IDHD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3112IDHD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3112IDHD#TRPBF?
LTC3112IDHD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3112IDHD#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 LTC3112IDHD#TRPBF?
For technical support, including LTC3112IDHD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3112IDHD#TRPBF requirements.
6.How does Aetrix verify that LTC3112IDHD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3112IDHD#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 LTC3112IDHD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3112IDHD#TRPBF?
All LTC3112IDHD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3112IDHD#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 LTC3112IDHD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3112IDHD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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