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Analog Devices Inc. LTC3112EFE#PBF
- Part No.:
- LTC3112EFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3112EFE#PBF.pdf
- Description:
- IC REG BUCK BST ADJ 2.5A 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,120
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Product details
Overview
LTC3112EFE#PBF from Analog Devices (formerly Linear Technology) is a fixed-frequency synchronous 4-switch buck-boost DC/DC converter delivering up to 2.5A continuous output current at 5V with input range 2.7V–15V and output range 2.5V–14V. It features integrated N-channel MOSFETs (RDS(ON) = 40–60 mΩ), 750 kHz switching frequency (synchronizable 300 kHz–1.5 MHz), and output disconnect in shutdown. It enables seamless regulation where VIN >, <, or = VOUT, e.g., powering 5V/2.5A loads from single/dual Li-ion or backup capacitor stacks.
For engineers reviewing the LTC3112EFE#PBF datasheet, LTC3112EFE#PBF pinout, LTC3112EFE#PBF application, or LTC3112EFE#PBF equivalent, key selection criteria include its wide-input/wide-output capability, internal current monitoring (IOUT pin), selectable PWM/Burst Mode operation, and thermal performance in the 20-pin TSSOP package with exposed pad.
Technical Context
The LTC3112EFE#PBF implements a proprietary 4-switch, single-inductor architecture that dynamically selects buck, boost, or buck-boost conduction paths without discontinuity in inductor current. Its voltage-mode control loop uses an error amplifier (COMP) with external R-C compensation and a 0.8 V reference for FB-based output regulation.
It integrates dual floating gate drivers (BST1/BST2) for high-side N-MOSFETs, supports output overvoltage protection (OVP) via dedicated pin, and includes reverse current limiting on SW2/VOUT during fixed-frequency operation. Thermal shutdown activates at ~170°C with automatic restart at ~160°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7 V to 15 V - supports single-cell Li-ion (2.7–4.2 V), dual/triple Li-ion (5.4–12.6 V), or 12 V wall adapters without pre-regulation. |
| Output Voltage Range | 2.5 V to 14 V - adjustable via FB resistor divider; enables 3.3 V, 5 V, or 12 V rails from variable sources. |
| Continuous Output Current | 2.5 A at VIN ≥ 5 V, VOUT = 5 V, PWM mode - sufficient for RF transmitters, handheld terminals, and LED drivers. |
| Switching Frequency | 750 kHz typical, synchronizable 300 kHz–1.5 MHz - balances efficiency, size, and EMI; allows clock alignment in multi-rail systems. |
| Quiescent Current | 50 µA in Burst Mode, <1 µA in shutdown - extends battery life in always-on or low-duty-cycle applications. |
| Efficiency | Up to 95% - achieved using low-RDS(ON) internal N-MOSFETs (40–60 mΩ) and optimized gate drive. |
| Output Current Monitor | IOUT pin sources 24 µA/A of SW2-to-VOUT current - enables analog current limiting or real-time load monitoring without sense resistor. |
Pinout & Package
Package: 20-Lead Plastic TSSOP (FE) with exposed thermal pad (Pin 21 = GND). Requires soldering of exposed pad to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 10, 11, 20, Exposed Pad 21) | Power and signal ground reference | Exposed pad is primary thermal path; must be connected to large copper area with multiple vias for ≤38°C/W θJA. |
| PWM/SYNC (Pin 19) | Mode control and frequency synchronization input | DC voltage <0.5 V enables Burst Mode; >1.5 V forces 750 kHz PWM; 300–1500 kHz square wave overrides internal oscillator. |
| VCC (Pin 18) | Internally regulated supply for control circuitry and gate drivers | Clamped at 4.2 V; tracks VIN below 4.2 V; requires 1 µF ceramic capacitor to GND for stability. |
| RUN (Pin 7) | Enable/shutdown control | Logic-high (>0.75 V typ.) enables operation; <0.35 V disables converter and reduces IQ to <1 µA. |
| IOUT (Pin 8) | Analog current monitor output | Sources 24 µA per ampere of SW2 output current; used with RC network for average current limit or telemetry. |
| FB (Pin 3) | Feedback voltage input | Compares divided VOUT to 0.8 V reference; sets output via R1/R2 divider: VOUT = 0.8 V × (1 + R1/R2). |
| OVP (Pin 4) | Overvoltage protection input | Monitors scaled VOUT against 0.83 V threshold; triggers shutdown if exceeded; programmable via R3/R4 divider. |
| VIN (Pins 5, 6) | Main input power supply | Accepts 2.7–15 V; requires ≥10 µF low-ESR ceramic bypass capacitor placed adjacent to pins. |
| VOUT (Pin 9) | Regulated output voltage | Delivers up to 2.5 A; requires ≥47 µF low-ESR ceramic output capacitor with short ground return path. |
| SW1 (Pins 15, 16) | Switch node for internal switches A and B | Connects to one end of external inductor; BST1 capacitor (0.1 µF) must be placed between BST1 and SW1. |
| BST1 (Pin 17) | Floating gate drive supply for switch A | Provides boosted voltage for high-side N-MOSFET A; capacitor to SW1 forms charge pump. |
| SW2 (Pins 12, 13) | Switch node for internal switches C and D | Connects to other end of external inductor; BST2 capacitor (0.1 µF) must be placed between BST2 and SW2. |
| BST2 (Pin 14) | Floating gate drive supply for switch D | Provides boosted voltage for high-side N-MOSFET D; capacitor to SW2 forms charge pump. |
| COMP (Pin 2) | Error amplifier output | Drives external R-C compensation network between COMP and FB to stabilize feedback loop. |
Key Features
| Feature | Design Value |
|---|---|
| 4-Switch Synchronous Buck-Boost Topology | Enables continuous regulation across VIN/VOUT crossover without mode switching artifacts or output glitches. |
| Integrated Low-RDS(ON) N-Channel MOSFETs | Switches A–D with RDS(ON) = 40–60 mΩ reduce conduction loss and eliminate external FETs and drivers. |
| Output Disconnect in Shutdown | Prevents backfeed from VOUT to VIN when disabled - critical for battery-powered systems with shared rails. |
| Programmable Overvoltage Protection (OVP) | Dedicated OVP pin allows setting trip point below nominal VOUT (e.g., 5.5 V for 5 V rail) to protect downstream ICs. |
| Internal Soft-Start (2 ms) | Controls output ramp rate independently of output capacitance or load, preventing inrush current and overshoot. |
| Inductor Damping in Sleep/Burst Mode | 250 Ω active pull-down on SW1/SW2 minimizes ringing and EMI when converter is idle or lightly loaded. |
Applications
| Handheld Inventory Terminal | RF Transmitter Power Supply |
|---|---|
Use Scenario: Portable barcode scanner powered by dual Li-ion (7.2–8.4 V) requiring stable 5 V/2 A for MCU, display, and laser driver. IC Role / Device Role / Timing Role: Primary buck-boost regulator maintaining 5 V output as battery discharges from 8.4 V to 6.0 V. Use Value: Seamless VIN-to-VOUT transition eliminates brownouts during battery sag; Burst Mode extends runtime between charges. |
Use Scenario: UHF RFID reader transmitting bursts at 12 V/1.5 A from a 3.6 V Li-ion cell. IC Role / Device Role / Timing Role: High-efficiency boost converter generating clean 12 V rail synchronized to transmit timing. Use Value: 95% peak efficiency minimizes heat in compact enclosure; 750 kHz switching allows small 4.7 µH inductor and low-profile layout. |
| LED Lighting with Current Regulation | Multi-Source Power System |
Use Scenario: Automotive interior lighting using 12 V lead-acid battery (9–16 V range) to drive constant-current LED string at 5 V. IC Role / Device Role / Timing Role: Buck-boost controller supplying regulated 5 V to LED driver IC while monitoring load current via IOUT. Use Value: IOUT pin provides 24 µA/A analog current feedback for closed-loop dimming without shunt resistor losses. |
Use Scenario: Industrial sensor node accepting power from USB (5 V), coin cell (3 V), or supercapacitor (1–5 V) - all feeding same 3.3 V system rail. IC Role / Device Role / Timing Role: Universal input regulator adapting to any source within 2.7–15 V range and delivering stable 3.3 V/1.5 A. Use Value: Single-component solution replaces multiple discrete regulators; eliminates manual source selection or complex power-path management. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8390EFE#PBF | Higher 60 V input rating, 3.5 A output, spread-spectrum EMI reduction, but larger 28-pin TSSOP package and no integrated OVP pin. | Better suited for automotive 24 V systems or noise-sensitive environments; lacks direct OVP programming and IOUT monitor. | Select LT8390EFE#PBF when input exceeds 15 V or EMI compliance is critical; retain LTC3112EFE#PBF for cost-sensitive, space-constrained 12 V or battery apps with OVP/IOUT needs. |
| TPS63020DSJR | Lower 0.3–5.5 V input, 2.5 A output, 2.5 MHz max frequency, no OVP pin, no IOUT monitor, smaller 10-pin WSON package. | Optimized for ultra-low-voltage battery inputs (e.g., single LiFePO4); lacks protection and telemetry features of LTC3112EFE#PBF. | Choose TPS63020DSJR for sub-3 V input applications where size and cost dominate; LTC3112EFE#PBF remains preferred for 2.7–15 V industrial/battery systems needing robust protection and current visibility. |
Compared with LT8390EFE#PBF and TPS63020DSJR, the LTC3112EFE#PBF uniquely balances wide input/output flexibility, integrated OVP and current monitoring, and thermal performance in a 20-pin TSSOP - making it optimal for mid-power battery-backed or multi-rail industrial converters where feature completeness outweighs ultra-high voltage or ultra-small footprint requirements.
Availability
LTC3112EFE#PBF is available at Aetrix Electronics and suitable for handheld terminals, RF transmitters, LED lighting systems, and multi-source power systems requiring stable component supply across temperature ranges from –40°C to +125°C.
Supply support for LTC3112EFE#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 high-performance power management portfolio with rigorous qualification and long-term product support.
The LTC3112EFE#PBF belongs to Linear's precision buck-boost regulator family, designed specifically for applications demanding seamless regulation across input/output crossovers - such as battery-powered instrumentation, portable communications, and industrial backup power systems.
FAQ
What is the maximum continuous output current of the LTC3112EFE#PBF?
The LTC3112EFE#PBF delivers up to 2.5 A continuous output current under PWM mode operation when VIN ≥ 5 V and VOUT = 5 V. Output current capability decreases at lower input voltages or higher output voltages due to power limitations and thermal constraints. Derating curves in the datasheet show 2.0 A at 12 VOUT with 12 VIN. The LTC3112EFE#PBF includes internal current limiting and thermal shutdown to protect against overload conditions.
Does the LTC3112EFE#PBF support synchronization to an external clock?
Yes, the LTC3112EFE#PBF supports external clock synchronization via the PWM/SYNC pin (Pin 19). Applying a square-wave signal between 300 kHz and 1.5 MHz overrides the internal 750 kHz oscillator. The signal must maintain minimum high/low times of 100 ns to ensure reliable locking. This capability allows precise timing alignment in multi-converter systems and EMI reduction through frequency dithering - a key advantage of the LTC3112EFE#PBF over non-synchronizable alternatives.
How does the IOUT pin on the LTC3112EFE#PBF function?
The IOUT pin (Pin 8) of the LTC3112EFE#PBF sources a current of 24 µA per ampere of SW2-to-VOUT output current. This analog current monitor enables real-time load measurement or programmable current limiting without external sense resistors. When used with an RC network, it provides average current regulation; when fed to an ADC, it delivers proportional telemetry. Accuracy is specified at ±12 µA across temperature and load - a core differentiator of the LTC3112EFE#PBF for battery management and fault diagnostics.
What thermal design considerations apply to the LTC3112EFE#PBF in its TSSOP package?
The LTC3112EFE#PBF in the 20-pin TSSOP (FE) package has θJA = 38°C/W and requires soldering of the exposed pad (Pin 21) to a solid GND plane with ≥4 thermal vias. Layout must minimize trace resistance between GND pins and the pad. Efficiency and output current derate above 85°C ambient; die temperature must stay below 150°C. The LTC3112EFE#PBF includes thermal foldback starting at ~150°C and full shutdown at ~170°C - features essential for unattended operation in enclosed industrial enclosures.
Can the LTC3112EFE#PBF regulate output voltage when input voltage equals output voltage?
Yes, the LTC3112EFE#PBF is explicitly designed for seamless regulation when VIN = VOUT, leveraging its 4-switch architecture to avoid discontinuities or efficiency drops at the buck-boost crossover point. Unlike 2-switch or SEPIC solutions, it maintains continuous inductor current and stable regulation across the full 2.7–15 V input and 2.5–14 V output ranges - a defining capability confirmed in the LTC3112EFE#PBF datasheet's typical performance curves and block diagram.
LTC3112EFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width) 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:
- 20-TSSOP-EP
LTC3112EFE#PBF FAQ
1.How can I place an order for LTC3112EFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3112EFE#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 LTC3112EFE#PBF reliable?
The price and inventory of LTC3112EFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3112EFE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3112EFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3112EFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3112EFE#PBF?
LTC3112EFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3112EFE#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 LTC3112EFE#PBF?
For technical support, including LTC3112EFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3112EFE#PBF requirements.
6.How does Aetrix verify that LTC3112EFE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3112EFE#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 LTC3112EFE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3112EFE#PBF?
All LTC3112EFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3112EFE#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 LTC3112EFE#PBF part is unused and in its original packaging.
Return procedure for LTC3112EFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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