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Analog Devices Inc. LTC3112EDHD#TRPBF
- Part No.:
- LTC3112EDHD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LTC3112EDHD#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 2.5A 16DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,153
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Product details
Overview
LTC3112EDHD#TRPBF 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#TRPBF datasheet, LTC3112EDHD#TRPBF pinout, LTC3112EDHD#TRPBF application, or LTC3112EDHD#TRPBF 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 shutdown with 150°C TJMAX.
Technical Context
The LTC3112EDHD#TRPBF implements a proprietary voltage-mode control algorithm with dual current-limit protection: an average current limit (6A typical) acting through the error amplifier feedback path and a fast peak current limit (10A typical) for hard short-circuit response. Its 4-switch topology enables continuous conduction across buck, buck-boost, and boost modes without inductor current discontinuity.
It integrates two independent floating gate drivers (BST1/BST2), supports selectable PWM or Burst Mode operation (50µA IQ), provides output disconnect in shutdown, and features programmable overvoltage protection (OVP) and internal soft-start (2ms nominal). The VCC regulator clamps at 4.2V and tracks VIN below that threshold.
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 industrial sensors. |
| Switching Frequency | 750kHz (typical), synchronizable 300kHz–1.5MHz - balances efficiency, EMI, and inductor size in space-constrained designs. |
| Efficiency | Up to 95% - achieved using low-RDS(ON) internal N-MOSFETs (40–60mΩ) and optimized gate drive. |
| Shutdown Current | <1µA - preserves battery life in always-on backup systems and IoT endpoints. |
| Output Current Monitor | 24µA/A sourced from IOUT pin - enables precise load-current measurement or closed-loop current limiting without sense resistor. |
Pinout & Package
Package: 16-lead (5mm × 4mm × 0.75mm) plastic DFN with exposed thermal pad (Pin 17, GND). Requires soldering of exposed pad to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 17) | Power and 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 | Accepts 2.7V–15V; requires ≥10µF low-ESR ceramic capacitor placed adjacent to pins for stability and transient response. |
| VOUT (Pin 8) | Regulated output voltage node | Delivers up to 2.5A; requires ≥47µF low-ESR ceramic capacitor directly at pin for ripple suppression and loop stability. |
| SW1 (Pins 12, 13) | Switch node A/B connection | Connects internal N-MOSFETs A and B to external inductor; BST1 capacitor (0.1µF) must tie BST1 to SW1. |
| SW2 (Pins 9, 10) | Switch node C/D connection | Connects internal N-MOSFETs C and D to same inductor; BST2 capacitor (0.1µF) must tie BST2 to SW2. |
| FB (Pin 2) | Feedback voltage input | Sets output voltage via resistor divider; regulated at 0.8V (±2.5%); determines VOUT = 0.8V × (1 + R1/R2). |
| IOUT (Pin 7) | Current monitor output | Sources 24µA per ampere of switch-D output current; enables analog current sensing or programmable current limit with RC network. |
| RUN (Pin 6) | Enable/shutdown control | Logic-high (>0.75V) enables operation; logic-low (<0.35V) disables converter and reduces IQ to <1µA. |
| PWM/SYNC (Pin 16) | Mode selection and frequency sync | <0.5V selects Burst Mode (50µA IQ); >1.5V selects 750kHz PWM; 300kHz–1.5MHz square wave overrides internal oscillator. |
Key Features
| Feature | Design Value |
|---|---|
| Seamless buck-boost regulation | Maintains regulation when VIN crosses VOUT - eliminates output glitches during battery discharge or source transitions. |
| Internal N-channel MOSFETs | 4-switch topology with RDS(ON) = 40mΩ (Switch A), 50mΩ (Switches B/C), 60mΩ (Switch D) - eliminates external FETs and reduces BOM count. |
| Output disconnect in shutdown | Isolates VOUT from VIN during RUN = low - prevents backfeed and protects downstream circuitry in battery backup applications. |
| Programmable overvoltage protection | OVP pin accepts resistor divider to set trip point at 0.83V × (1 + R3/R4); hysteresis = 20mV - safeguards sensitive loads from rail faults. |
| Thermal shutdown with auto-recovery | Disables all switches at ~170°C; restarts at ~160°C - protects IC under sustained overload or poor heatsinking without latch-up. |
Applications
| RF Transmitter Power Supply | Multi-Source Industrial System |
|---|---|
|
Use Scenario: Powering 12V RF power amplifiers from variable-input sources including 3S Li-ion (9–12.6V) and 12V lead-acid batteries with aging voltage sag. IC Role / Device Role / Timing Role: Buck-boost regulator maintaining stable 12V output despite input dropping to 9V or rising to 14.4V during charge cycles. Use Value: Eliminates need for separate buck and boost converters; delivers 2.5A continuous current with ≤100mV ripple at 750kHz, enabling clean RF envelope fidelity. |
Use Scenario: Consolidating power from USB-C PD (5–20V), supercapacitor backup (2.5–5.5V), and 12V wall adapter into a single 5V system rail for embedded controllers. IC Role / Device Role / Timing Role: Wide-input buck-boost controller dynamically selecting optimal source while regulating 5V output with seamless transitions. Use Value: Supports uninterrupted operation during source switchover; 95% peak efficiency minimizes heat in sealed enclosures; IOUT pin enables real-time source-load current balancing. |
| Handheld Inventory Terminal | LED Lighting with Current Regulation |
|
Use Scenario: Powering ARM-based terminal with 3.3V core, 5V peripherals, and display backlight from single 3.7V Li-ion cell across full discharge range (4.2V → 2.8V). IC Role / Device Role / Timing Role: Single-stage buck-boost generating 3.3V and 5V outputs (via secondary LDOs) with Burst Mode for ultra-low standby current. Use Value: Extends battery runtime by >30% vs. traditional boost-only solutions; <1µA shutdown current preserves charge during weeks of storage. |
Use Scenario: Driving constant-current LED strings (e.g., 3×1W white LEDs, VF ≈ 9.6V) from 12V automotive or 5V USB sources with dimming capability. IC Role / Device Role / Timing Role: Buck-boost configured as constant-current source using IOUT pin feedback to regulate LED current independently of forward voltage variation. Use Value: Achieves ±3% LED current accuracy across temperature and input voltage; eliminates external sense resistor and associated power loss. |
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 lacks integrated OVP and IOUT current monitor; uses external compensation. | Requires additional components for overvoltage protection and current sensing; less suitable for safety-critical or current-regulated LED apps. | Preferred where cost sensitivity outweighs feature integration; verify layout compatibility with different pinout and thermal pad configuration. |
| TPS63020DSJR | 4-switch buck-boost, 3A max, 2.5V–5.5V input only; no support for >5.5V inputs like 12V adapters or 3S Li-ion. | Cannot replace LTC3112EDHD#TRPBF in 12V-input or wide-range backup-capacitor applications without upstream pre-regulation. | Select only for strictly low-voltage battery-powered devices (e.g., wearables); confirm input range alignment before substitution. |
Compared with MP2918GQ-Z and TPS63020DSJR, the LTC3112EDHD#TRPBF uniquely combines 15V input capability, integrated OVP, and precision current monitoring in a thermally enhanced DFN - making it optimal for industrial and RF power applications requiring robustness and design simplicity.
Availability
LTC3112EDHD#TRPBF is available at Aetrix Electronics and suitable for RF transmitter power supplies, multi-source industrial systems, handheld inventory terminals, and LED lighting applications requiring stable component supply and long-term manufacturability.
Supply support for LTC3112EDHD#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 full product support, documentation, and manufacturing continuity for the LTC portfolio.
The LTC3112 belongs to Linear's high-efficiency, wide-input buck-boost regulator family, designed specifically for battery-backed, multi-rail, and energy-harvesting systems where input voltage may fall below or exceed the required output.
FAQ
What is the maximum continuous output current of the LTC3112EDHD#TRPBF?
The LTC3112EDHD#TRPBF delivers up to 2.5A continuous output current when VIN ≥ 5V and VOUT = 5V in PWM mode. At lower input voltages (e.g., 2.7V), output current is reduced due to thermal and current-limit constraints; derating curves are provided in the datasheet Figure G04. The LTC3112EDHD#TRPBF achieves this using internal 40–60mΩ N-MOSFETs and a thermally optimized DFN package.
Does the LTC3112EDHD#TRPBF support synchronization to an external clock?
Yes, the LTC3112EDHD#TRPBF supports external frequency synchronization via the PWM/SYNC pin. Applying a square wave between 300kHz and 1.5MHz overrides the internal 750kHz oscillator. The signal must maintain minimum high/low times of 100ns for reliable locking. This capability allows EMI reduction through spread-spectrum or noise-sensitive system clock alignment - a feature confirmed in the LTC3112EDHD#TRPBF datasheet Absolute Maximum Ratings and Electrical Characteristics tables.
How does the IOUT pin on the LTC3112EDHD#TRPBF function?
The IOUT pin on the LTC3112EDHD#TRPBF sources 24µA per ampere of switch-D output current, enabling direct analog current monitoring or closed-loop current regulation. When paired with a 42.2kΩ resistor, it produces 1V per ampere - matching standard ADC input ranges. This eliminates the need for a discrete sense resistor and associated power loss. The LTC3112EDHD#TRPBF datasheet specifies ±16µA accuracy at 1.5A load (Figure G20), confirming its use in precision current-controlled applications like LED drivers.
What thermal considerations apply to the LTC3112EDHD#TRPBF in high-power operation?
The LTC3112EDHD#TRPBF requires soldering of its exposed thermal pad (Pin 17) to a PCB ground plane with multiple thermal vias to maintain junction temperature below 150°C. Thermal performance curves (Figures G24–G26) show die temperature rise versus load current for 3.3V/5V/12V outputs. At 2.5A and 12VIN→5VOUT, rise exceeds 40°C on a 4-layer demo board - underscoring the need for adequate copper area. The LTC3112EDHD#TRPBF enters thermal shutdown above ~170°C and auto-restarts at ~160°C.
Can the LTC3112EDHD#TRPBF operate with input voltage below the output voltage?
Yes, the LTC3112EDHD#TRPBF is explicitly designed for seamless operation when VIN < VOUT (boost mode), VIN > VOUT (buck mode), or VIN = VOUT (buck-boost transition). Its 4-switch architecture ensures continuous inductor current and stable regulation across all three regions without output disruption - a core feature validated in the Typical Application schematic (TA01) and performance graphs (G01a–G03a). This makes the LTC3112EDHD#TRPBF ideal for battery-powered systems with wide discharge profiles.
LTC3112EDHD#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)
LTC3112EDHD#TRPBF FAQ
1.How can I place an order for LTC3112EDHD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3112EDHD#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 LTC3112EDHD#TRPBF reliable?
The price and inventory of LTC3112EDHD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3112EDHD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3112EDHD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3112EDHD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3112EDHD#TRPBF?
LTC3112EDHD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3112EDHD#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 LTC3112EDHD#TRPBF?
For technical support, including LTC3112EDHD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3112EDHD#TRPBF requirements.
6.How does Aetrix verify that LTC3112EDHD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3112EDHD#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 LTC3112EDHD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3112EDHD#TRPBF?
All LTC3112EDHD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3112EDHD#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 LTC3112EDHD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3112EDHD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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