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Analog Devices Inc. LTC3118EUFD#TRPBF
- Part No.:
- LTC3118EUFD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC3118EUFD#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 2A 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,767
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Product details
Overview
LTC3118EUFD#TRPBF from Analog Devices (formerly Linear Technology) is a dual-input, synchronous buck-boost DC/DC converter with integrated PowerPath™ control. It delivers up to 2A at programmable 2V–18V output from either VIN1 or VIN2 (2.2V–18V), supports seamless buck/boost mode transitions, and operates at fixed 1.2MHz PWM or low-quiescent 50µA Burst Mode. It enables high-efficiency backup power systems using wall adapter + Li-ion or battery + supercapacitor inputs.
For engineers reviewing the LTC3118EUFD#TRPBF datasheet, LTC3118EUFD#TRPBF pinout, LTC3118EUFD#TRPBF application, or LTC3118EUFD#TRPBF equivalent, key selection criteria include dual-input voltage range (2.2–18V), 2A output capability, 4mm × 5mm QFN thermal performance (θJC = 3.4°C/W), independent RUN pin UVLO programming, and ideal diode vs priority VIN selection logic.
Technical Context
The LTC3118EUFD#TRPBF implements a current-mode, monolithic buck-boost topology with four internal N-channel MOSFETs (RDS(ON) ≤ 120mΩ) and dual bootstrapped gate drivers (BST1/BST2). Its proprietary switch algorithm maintains regulation when VIN1 or VIN2 is above, below, or equal to VOUT - eliminating subharmonic oscillation and output transients during mode transitions.
It integrates two independent charge-pump circuits (CP1/CN1 for VIN1; CP2/CN2 for VIN2), CM filter pins for EMI suppression, and accurate 1.22V RUN comparators with 170mV hysteresis per input. The SEL pin configures ideal diode (VIN1/VIN2 auto-select) or VIN1 priority mode, while MODE pin selects between fixed-frequency PWM or Burst Mode operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | VIN1 or VIN2: 2.2V to 18V - supports wide-source flexibility including single-cell Li-ion (2.7V), USB PD (5–20V), and industrial rails. |
| Output Voltage Range | 2V to 18V - programmable via FB resistor divider; enables direct 3.3V, 5V, or 12V system rail generation. |
| Max Output Current | 2A continuous - verified at 5VOUT with VIN > 6V; limited by internal 3.6A typical average inductor current sense threshold. |
| Switching Frequency | Fixed 1.2MHz (±200kHz) - enables compact 3.3µH inductor and minimal output capacitance in space-constrained designs. |
| Quiescent Current | 50µA in Burst Mode, 2µA in shutdown - extends battery runtime in always-on backup systems. |
| Efficiency | Up to 94% - achieved at mid-load with 5VOUT from 5V/12V inputs; optimized by low-RDS(ON) internal FETs and synchronous rectification. |
| Operating Temp | –40°C to +125°C junction - qualified for automotive cabin, industrial control, and telecom infrastructure environments. |
Pinout & Package
The LTC3118EUFD#TRPBF is housed in a thermally enhanced 24-lead 4mm × 5mm plastic QFN package with exposed PGND pad (Pin 25) requiring soldering to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SEL (Pin 1) | Input source selection control | Logic low = VIN1 priority; logic high = ideal diode mode (auto-select higher valid VIN); determines system-level power arbitration behavior. |
| VIN1 (Pin 2) | Primary input supply | Lower RDS(ON) path (80mΩ A1 switch); preferred for efficiency-critical sources like main battery or primary adapter. |
| RUN1 (Pin 3) | VIN1 enable & UVLO threshold input | Accurate 1.22V threshold with 170mV hysteresis; resistor-divider programmable to set turn-on voltage above 2.2V. |
| RUN2 (Pin 4) | VIN2 enable & UVLO threshold input | Independent 1.22V threshold with hysteresis; enables asymmetric startup sequencing for backup source activation. |
| VCC (Pin 5) | Internal LDO output | 3.8V ±0.3V regulated supply for gate drivers; can be back-driven up to 5.5V; bypassed with 4.7µF ceramic capacitor. |
| MODE (Pin 6) | Operation mode select | Logic low = Burst Mode (50µA IQ); logic high = forced PWM (12mA IQ); critical for noise-sensitive or constant-load applications. |
| GND (Pin 7) | Signal reference ground | Low-impedance return for analog circuitry; must connect directly to ground plane with short trace to minimize noise coupling. |
| VC (Pin 8) | Error amplifier output | Compensation node for voltage loop; RC network to ground sets dominant pole; average current loop is internally compensated. |
| FB (Pin 9) | Feedback input | 1.0V ±2% reference; connects to resistor divider from VOUT; sets output voltage as VOUT = 1.0V × (1 + R1/R2). |
| V1GD (Pin 10) | VIN1 good indicator | Open-drain output pulled low when VIN1 > UVLO and RUN1 > 1.22V - signals readiness of primary source. |
| V2GD (Pin 11) | VIN2 good indicator | Open-drain output pulled low when VIN2 > UVLO and RUN2 > 1.22V - enables status monitoring of backup source. |
| PGD (Pin 12) | Power good indicator | Open-drain output pulled low when VOUT > 92% of programmed value - provides system-level power validation signal. |
| VOUT (Pin 13) | Regulated output | Delivers up to 2A; requires ≥47µF low-ESR ceramic capacitor placed adjacent to IC for stability and transient response. |
| SW2 (Pin 14) | Boost-side switch node | Connects to inductor output side; high dv/dt node - demands short, wide PCB trace to minimize EMI and switching losses. |
| BST2 (Pin 15) | SW2 high-side gate drive bootstrap | Connects via 0.1µF capacitor to SW2; supplies floating gate voltage for D-switch (VIN2→SW2→VOUT path). |
| BST1 (Pin 16) | SW1 high-side gate drive bootstrap | Connects via 0.1µF capacitor to SW1; supplies floating gate voltage for A1/A2 switches (VIN1/VIN2→SW1 path). |
| SW1 (Pin 17) | Buck-side switch node | Connects to inductor input side; shared switching node for both input paths; requires low-inductance layout. |
| VIN2 (Pin 18) | Secondary input supply | Higher RDS(ON) path (120mΩ A2 switch); suitable for less efficiency-critical backup sources like supercapacitors. |
| CP2 (Pin 19) | VIN2 charge-pump positive | Toggles between VIN2 and VIN2+VCC during VIN2 operation; drives gate of A2 switch via CN2/CP2 10nF capacitor. |
| CN2 (Pin 20) | VIN2 charge-pump negative | Driven between VCC and GND during VIN2 operation; monitors CN2 toggling to detect VIN2 active state. |
| CM2 (Pin 21) | VIN2 MOSFET common filter | Connects 47nF capacitor to ground; filters common-mode noise from VIN2-to-SW1 FETs to reduce EMI emissions. |
| CM1 (Pin 22) | VIN1 MOSFET common filter | Connects 47nF capacitor to ground; filters common-mode noise from VIN1-to-SW1 FETs - critical for clean dual-input operation. |
| CN1 (Pin 23) | VIN1 charge-pump negative | Driven between VCC and GND during VIN1 operation; monitors CN1 toggling to detect VIN1 active state. |
| CP1 (Pin 24) | VIN1 charge-pump positive | Toggles between VIN1 and VIN1+VCC during VIN1 operation; drives gate of A1 switch via CN1/CP1 10nF capacitor. |
| PGND (Pin 25) | Power ground | Exposed thermal pad; must be soldered to solid PCB ground plane for thermal dissipation (θJC = 3.4°C/W) and low-noise return path. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-input PowerPath™ architecture | Enables seamless switchover between two independent sources without output dropout or reverse current - eliminates need for external OR-ing FETs or diodes. |
| Programmable RUN pin UVLO thresholds | Independent 1.22V comparator per input with 170mV hysteresis allows precise, asymmetric turn-on sequencing (e.g., main battery at 3.0V, backup at 2.5V). |
| Integrated charge-pump gate drivers | Eliminates external bootstrap components for high-side N-FETs; supports 100% duty cycle in boost mode and robust gate drive across full input range. |
| Seamless buck-boost mode transition | No subharmonics or output glitches during VIN-to-VOUT crossover - essential for powering noise-sensitive analog or RF subsystems. |
| Thermally enhanced QFN package | 4mm × 5mm footprint with exposed PGND pad achieves θJC = 3.4°C/W - sustains 2A output in compact industrial or portable designs without heatsinks. |
| Open-drain status indicators | V1GD, V2GD, and PGD provide real-time visibility into input readiness and output regulation - simplifies system-level fault detection and logging. |
Applications
| Portable Medical Monitor Backup Power | Industrial PLC Dual-Rail Input |
|---|---|
Use Scenario: Portable ultrasound or patient monitor with primary Li-ion battery and secondary supercapacitor backup. IC Role / Device Role / Timing Role: Dual-input buck-boost regulator maintaining stable 5V system rail during battery swap or deep discharge. Use Value: Seamless switchover prevents data loss or reboot; 50µA Burst Mode extends supercapacitor hold-up time beyond 30 seconds. | Use Scenario: Programmable logic controller powered from either 24V DC field bus or 12V auxiliary supply. IC Role / Device Role / Timing Role: Input arbitrator and step-down converter generating isolated 3.3V/5V logic rails with reverse polarity protection. Use Value: Eliminates external diode-OR and LDO stages; 94% efficiency reduces thermal load in sealed enclosures. |
| Automotive Infotainment Power | USB-C PD Adapter Auxiliary Rail |
Use Scenario: In-vehicle infotainment head unit requiring stable 5V from variable 9–16V battery or 5V USB port. IC Role / Device Role / Timing Role: Wide-input buck-boost converter with ideal diode mode selecting highest valid source automatically. Use Value: Maintains operation during cold-crank (6V) or load-dump (20V); 1.2MHz switching avoids AM radio band interference. | Use Scenario: USB-C PD adapter providing 5V/3A main output and auxiliary 3.3V rail for controller and sensors. IC Role / Device Role / Timing Role: Secondary regulator deriving 3.3V from PD bus (5–20V) with independent enable and power-good signaling. Use Value: Replaces discrete buck + LDO solution; RUN pin programming ensures auxiliary rail only activates after main PD negotiation completes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-input buck-boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX20404ATG+T | Single-input 4.5–36V buck-boost; no dual-input arbitration; 3.5A max output; integrated I2C telemetry. | Lacks VIN1/VIN2 selection logic and PowerPath™; requires external ideal diode controllers for dual-source systems. | Select when telemetry, higher current, or wider input range outweigh need for native dual-input control. |
| TPS63802DLAR | Single-input 1.8–5.5V buck-boost; 2A output; no dual-input support; smaller 2mm × 2mm WSON package. | Cannot replace dual-source functionality; limited to low-voltage battery-powered devices (e.g., wearables). | Select only for space-constrained, single-source applications where 5.5V max input suffices. |
Compared with MAX20404ATG+T and TPS63802DLAR, the LTC3118EUFD#TRPBF uniquely integrates dual-input arbitration, ideal diode mode, and independent RUN pin UVLO programming - making it the only drop-in solution for systems requiring automatic, glitch-free switchover between two independent power sources without external control logic.
Availability
LTC3118EUFD#TRPBF is available at Aetrix Electronics and suitable for industrial PLCs, portable medical devices, automotive infotainment units, and USB-C PD adapter auxiliary rails requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3118EUFD#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 automotive and industrial qualification standards.
The LTC3118EUFD#TRPBF belongs to Linear's PowerPath™ buck-boost family, designed specifically for systems requiring reliable, seamless power source arbitration between primary and backup supplies in harsh environments.
FAQ
What input voltage ranges does the LTC3118EUFD#TRPBF support on VIN1 and VIN2?
The LTC3118EUFD#TRPBF supports 2.2V to 18V on both VIN1 and VIN2 inputs. Absolute maximum rating is 20V. This range accommodates single-cell Li-ion (2.7–4.2V), USB PD (5–20V), 12V/24V industrial rails, and automotive batteries (6–16V). Operation is guaranteed across this full range with proper thermal design and layout.
How does the SEL pin configure input selection behavior in the LTC3118EUFD#TRPBF?
When SEL is pulled low (to GND), the LTC3118EUFD#TRPBF enters VIN1 priority mode: it powers VOUT from VIN1 if RUN1 and VIN1 meet thresholds; otherwise it falls back to VIN2. When SEL is pulled high (to VCC), it enters ideal diode mode: it automatically selects the higher valid input (VIN1 or VIN2) that satisfies UVLO and RUN conditions - enabling transparent, lossless source arbitration.
What is the maximum continuous output current capability of the LTC3118EUFD#TRPBF?
The LTC3118EUFD#TRPBF delivers up to 2A continuous output current at 5VOUT when VIN exceeds 6V. This is validated under thermal limits with the 4mm × 5mm QFN package on a standard 4-layer demo board. At other output voltages or input conditions, current is limited by internal 3.6A average inductor current threshold and thermal headroom.
Does the LTC3118EUFD#TRPBF support programmable undervoltage lockout for each input?
Yes. The LTC3118EUFD#TRPBF features two independent RUN pins (RUN1 and RUN2), each with an accurate 1.22V threshold and 170mV hysteresis. Connecting resistive dividers from VIN1 or VIN2 to GND allows precise, asymmetric UVLO programming - for example, enabling VIN1 at 3.0V and VIN2 only at 2.5V to enforce priority sequencing.
What package type and thermal characteristics apply to the LTC3118EUFD#TRPBF?
The LTC3118EUFD#TRPBF uses a 24-lead 4mm × 5mm plastic QFN package with exposed PGND pad (Pin 25). Its thermal resistance is θJC = 3.4°C/W (junction-to-case) and θJA = 43°C/W (junction-to-ambient) on a standard 4-layer board. The exposed pad must be soldered to a solid PCB ground plane to achieve rated performance and reliability.
LTC3118EUFD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-WFQFN 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):
- 2.2V
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- 2V
- Voltage - Output (Max):
- 18V
- Current - Output:
- 2A
- Frequency - Switching:
- 1.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (4x5)
LTC3118EUFD#TRPBF FAQ
1.How can I place an order for LTC3118EUFD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3118EUFD#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 LTC3118EUFD#TRPBF reliable?
The price and inventory of LTC3118EUFD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3118EUFD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3118EUFD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3118EUFD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3118EUFD#TRPBF?
LTC3118EUFD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3118EUFD#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 LTC3118EUFD#TRPBF?
For technical support, including LTC3118EUFD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3118EUFD#TRPBF requirements.
6.How does Aetrix verify that LTC3118EUFD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3118EUFD#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 LTC3118EUFD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3118EUFD#TRPBF?
All LTC3118EUFD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3118EUFD#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 LTC3118EUFD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3118EUFD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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