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Analog Devices Inc. LTC3118EUFD#PBF
- Part No.:
- LTC3118EUFD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC3118EUFD#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 2A 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,662
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Product details
Overview
LTC3118EUFD#PBF 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), operates seamlessly in buck, boost, or pass-through modes, and achieves up to 94% efficiency-ideal for backup power systems requiring seamless input switchover.
For engineers reviewing the LTC3118EUFD#PBF datasheet, LTC3118EUFD#PBF pinout, LTC3118EUFD#PBF application, or LTC3118EUFD#PBF equivalent, key selection criteria include dual-input UVLO programmability via RUN1/RUN2, 1.2MHz fixed-frequency PWM or selectable Burst Mode (50µA IQ), integrated N-channel MOSFETs with <120mΩ RDS(ON), and thermal robustness in the 4mm × 5mm QFN package.
Technical Context
The LTC3118EUFD#PBF employs current-mode control with a fixed 1.2MHz oscillator and proprietary switch sequencing to enable continuous regulation across VIN < VOUT, VIN = VOUT, and VIN > VOUT conditions. Its dual-input architecture uses independent gate drivers and charge-pump circuits (CP1/CN1, CP2/CN2) to isolate active and inactive inputs while maintaining low-loss conduction paths.
PowerPath logic supports two operational modes: SEL-driven ideal diode mode (selects higher valid VIN) or priority mode (VIN1-first with VIN2 fallback). Each input features independently programmable UVLO thresholds (1.22V ±50mV) with hysteresis, and output disconnect during shutdown ensures no reverse current flow.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | VIN1 or VIN2: 2.2V to 18V - supports wide-range sources including Li-ion, wall adapters, and supercaps without external pre-regulation. |
| Output Voltage Range | 2V to 18V - programmable via FB resistor divider; enables single-device support for 3.3V, 5V, 12V, or custom rails. |
| Max Output Current | 2A continuous - sustained delivery under full load with thermal management via exposed PGND pad. |
| Switching Frequency | 1.2MHz (±167kHz) - enables compact 3.3µH inductor and low-profile ceramic capacitors for space-constrained designs. |
| Quiescent Current | 50µA in Burst Mode, 2µA in shutdown - extends battery life in always-on or low-duty-cycle backup systems. |
| Efficiency | Up to 94% - achieved using all-N-channel MOSFETs with RDS(ON) as low as 80mΩ, minimizing conduction loss across operating range. |
| Operating Temp | –40°C to +125°C junction - qualified for industrial and automotive under-hood environments with derated lifetime above 125°C. |
Pinout & Package
The LTC3118EUFD#PBF is housed in a thermally enhanced 24-lead 4mm × 5mm plastic QFN package with exposed PGND pad (Pin 25) that must be soldered to PCB ground for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SEL (Pin 1) | Input selection mode control | Logic low = VIN1 priority; logic high = ideal diode mode selecting higher valid VIN - determines system-level power source arbitration behavior. |
| VIN1 (Pin 2) | Primary input supply | Lower-RDS(ON) path (80mΩ); preferred for high-efficiency critical sources; requires ≥22µF local ceramic decoupling. |
| RUN1 (Pin 3) | VIN1 enable & UVLO programming | Enables IC when >1.22V; resistor divider from VIN1 sets precise turn-on threshold - enables source-specific brownout protection. |
| RUN2 (Pin 4) | VIN2 enable & UVLO programming | Independent enable/UVLO for secondary source; both RUN pins low force 2µA shutdown - supports asymmetric source management. |
| VCC (Pin 5) | Internal LDO output | 3.8V ±0.3V regulated supply for gate drivers; can be back-driven up to 5.5V - simplifies biasing in multi-rail systems. |
| MODE (Pin 6) | Operation mode select | Logic low = Burst Mode (50µA IQ); logic high = forced PWM - trade-off between light-load efficiency and output ripple/noise. |
| GND (Pin 7) | Signal reference | Dedicated signal ground; requires short, low-inductance path to ground plane - critical for stable feedback and noise immunity. |
| VC (Pin 8) | Error amplifier output | Compensation node for voltage loop; RC network here sets bandwidth/stability - enables optimization for transient response vs. noise rejection. |
| FB (Pin 9) | Feedback input | 1.0V reference; connects to resistor divider from VOUT - sets output voltage per VOUT = 1.0V × (1 + R1/R2). |
| V1GD (Pin 10) | VIN1 good indicator | Open-drain; pulls low when VIN1 and RUN1 are valid - provides system-level status for fault monitoring or sequencing logic. |
| V2GD (Pin 11) | VIN2 good indicator | Open-drain; pulls low when VIN2 and RUN2 are valid - enables independent health reporting of redundant supplies. |
| PGD (Pin 12) | Power good indicator | Open-drain; asserts when VOUT ≥ 92% of programmed value - confirms regulation before enabling downstream loads. |
| VOUT (Pin 13) | Regulated output | Delivers up to 2A; requires ≥47µF low-ESR ceramic capacitor placed adjacent to IC - minimizes output impedance and ripple. |
| SW2 (Pin 14) | Boost-side switch node | Connects to inductor output side; high dv/dt node - demands short, wide PCB trace to reduce EMI and switching losses. |
| BST2 (Pin 15) | SW2 gate drive bootstrap | Connects via 0.1µF capacitor to SW2 - generates floating supply for high-side N-FET driving SW2 to PGND/VOUT path. |
| BST1 (Pin 16) | VIN1/VIN2 gate drive bootstrap | Connects via 0.1µF capacitor to SW1 - powers gate drivers for A1/A2 switches depending on active input source. |
| SW1 (Pin 17) | Buck-side switch node | Connects to inductor input side; shared node for VIN1→SW1 and VIN2→SW1 paths - central point for dual-input topology. |
| VIN2 (Pin 18) | Secondary input supply | Higher-RDS(ON) path (120mΩ); used when VIN1 is invalid or in ideal diode mode - supports redundancy with minor efficiency penalty. |
| CP2 (Pin 19) | VIN2 charge-pump positive | Toggles between VIN2 and VIN2+VCC during VIN2 operation - supplies gate voltage for A2 high-side FET. |
| CN2 (Pin 20) | VIN2 charge-pump negative | Switches between GND and VCC during VIN2 operation; 10nF cap to CP2 forms flying capacitor - enables self-contained gate drive. |
| CM2 (Pin 21) | VIN2 MOSFET common filter | 47nF cap to ground filters noise from VIN2-to-SW1 path - reduces EMI from high-side switching transitions. |
| CM1 (Pin 22) | VIN1 MOSFET common filter | 47nF cap to ground filters noise from VIN1-to-SW1 path - improves noise immunity for primary input path. |
| CN1 (Pin 23) | VIN1 charge-pump negative | Switches between GND and VCC during VIN1 operation; 10nF cap to CP1 forms flying capacitor - enables self-contained gate drive. |
| CP1 (Pin 24) | VIN1 charge-pump positive | Toggles between VIN1 and VIN1+VCC during VIN1 operation - supplies gate voltage for A1 high-side FET. |
| PGND (Pin 25) | Power ground | Exposed thermal pad; must be soldered to PCB ground plane - provides primary current return path and thermal dissipation (θJC = 3.4°C/W). |
Key Features
| Feature | Design Value |
|---|---|
| Dual-input PowerPath™ control | Enables seamless switchover between two independent sources (e.g., battery + adapter) without output disruption or external OR-ing FETs. |
| Programmable input UVLO per source | RUN1/RUN2 pins allow independent, resistor-set turn-on thresholds (e.g., 3.0V for Li-ion, 9V for wall adapter) - prevents premature shutdown during source transitions. |
| Integrated all-N-channel MOSFETs | Eliminates external high-side drivers; RDS(ON) as low as 80mΩ reduces conduction loss and board area - lowers BOM count and layout complexity. |
| 1.2MHz fixed-frequency PWM + Burst Mode | Ensures predictable EMI profile while achieving 50µA quiescent current at light loads - balances noise-sensitive and battery-life-critical requirements. |
| Output disconnect in shutdown | Prevents reverse current flow from VOUT to VIN1/VIN2 during disable - protects backup sources and avoids unintended discharge. |
| Thermally enhanced QFN package | 4mm × 5mm footprint with exposed PGND pad enables >2A operation at +125°C ambient - suitable for dense industrial and automotive PCBs. |
Applications
| Industrial Backup Power | Portable Medical Device |
|---|---|
Use Scenario: PLC I/O module powered by 12V rail with supercapacitor backup during AC failure. IC Role / Device Role / Timing Role: Dual-input buck-boost regulator providing uninterrupted 5V/2A output by switching from main 12V rail to charged supercap within microseconds. Use Value: Eliminates need for discrete diode-OR and linear regulators; maintains regulation during 100ms–2s outage with >90% efficiency across 3.6V–18V input range. | Use Scenario: Handheld ultrasound device with dual Li-ion cells (8.4V max) and USB-C input (5V/9V). IC Role / Device Role / Timing Role: Primary power manager generating stable 3.3V/2A and 5V/1A rails while arbitrating between battery and USB source based on availability and priority. Use Value: Enables automatic source selection without firmware intervention; 50µA Burst Mode extends battery runtime during standby without compromising startup speed. |
| Automotive Telematics | Network Edge Router |
Use Scenario: LTE modem module in vehicle infotainment system with 12V battery and 5V USB OTG input. IC Role / Device Role / Timing Role: Buck-boost converter delivering 3.3V/1.5A to modem IC while maintaining operation during cold-crank (4.5V) or load-dump (28V) transients. Use Value: Wide 2.2V–18V input range tolerates automotive voltage extremes; 94% peak efficiency reduces thermal stress in sealed enclosures. | Use Scenario: Fanless edge router with PoE+ (57V) and 12V DC jack inputs powering 12V/5V/3.3V subsystems. IC Role / Device Role / Timing Role: Secondary-stage regulator converting PoE-derived 12V to isolated 5V/2A for CPU core, with 12V jack as backup. Use Value: Dual-input capability enables redundant power without external controllers; PGD and VxGD signals feed into system supervisor for real-time source health monitoring. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-input buck-boost applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS63070DDCR | Single-input only (2.5V–16V), no dual-source arbitration; lower 1.6A max output; no RUN-pin UVLO programming. | Suitable for cost-sensitive single-source systems where input switchover is handled externally. | Select when dual-input control is unnecessary and BOM cost is prioritized over flexibility. |
| MAX20406AATGA/VY+ | Supports dual inputs (2.5V–16V) but lacks ideal diode mode; uses external FETs for OR-ing; no integrated charge pumps for high-side drive. | Requires additional MOSFETs and gate drivers for redundancy; better suited for high-voltage (>18V) or high-current (>3A) extensions. | Choose when scaling beyond 2A or integrating with existing high-side FET layouts. |
Compared with TPS63070DDCR and MAX20406AATGA/VY+, the LTC3118EUFD#PBF uniquely integrates dual-input arbitration, programmable UVLO per source, and self-contained gate drive - reducing component count and improving reliability in mission-critical backup power designs.
Availability
LTC3118EUFD#PBF is available at Aetrix Electronics and suitable for industrial backup power, portable medical devices, automotive telematics, and network edge routers requiring stable component supply across extended temperature ranges.
Supply support for LTC3118EUFD#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 analog and power management portfolio.
The LTC3118EUFD#PBF belongs to Linear's PowerPath™ buck-boost family, designed specifically for seamless dual-input power systems in industrial, automotive, and portable applications demanding high efficiency and robust fault handling.
FAQ
What input voltage ranges does the LTC3118EUFD#PBF support?
The LTC3118EUFD#PBF supports VIN1 or VIN2 input voltages from 2.2V to 18V. Both inputs can operate independently or simultaneously, and the device regulates VOUT (2V–18V) regardless of whether VIN is above, below, or equal to VOUT. Absolute maximum rating is 20V, but continuous operation above 18V is not recommended.
How does the LTC3118EUFD#PBF handle input source switchover?
The LTC3118EUFD#PBF uses the SEL pin to configure switchover behavior: logic high enables ideal diode mode (selects higher valid VIN), logic low enables VIN1 priority mode (falls back to VIN2 only if VIN1 is invalid). Transitions are seamless with no output dropout, supported by internal charge-pump circuits and fast gate drivers.
Can the LTC3118EUFD#PBF operate with only one input source connected?
Yes, the LTC3118EUFD#PBF operates normally with only VIN1 or only VIN2 connected. If the unconnected input is left floating, its RUN pin must be pulled below 0.2V to prevent false enablement. The device will regulate VOUT using the valid input, and VxGD indicators reflect active source status.
What is the purpose of the CM1 and CM2 pins on the LTC3118EUFD#PBF?
The CM1 and CM2 pins on the LTC3118EUFD#PBF serve as common-mode filter nodes for the VIN1-to-SW1 and VIN2-to-SW1 N-channel MOSFET paths, respectively. A 47nF capacitor from each CM pin to ground suppresses high-frequency switching noise generated during gate transitions, improving EMI performance and stability.
Does the LTC3118EUFD#PBF provide output disconnect during shutdown?
Yes, the LTC3118EUFD#PBF provides true output disconnect in shutdown mode: when both RUN1 and RUN2 are pulled low, internal switches open to prevent reverse current flow from VOUT to either VIN1 or VIN2. This protects backup sources and avoids unintended discharge in battery-backed systems.
LTC3118EUFD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-WFQFN 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):
- 2.2V
- 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#PBF FAQ
1.How can I place an order for LTC3118EUFD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3118EUFD#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 LTC3118EUFD#PBF reliable?
The price and inventory of LTC3118EUFD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3118EUFD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3118EUFD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3118EUFD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3118EUFD#PBF?
LTC3118EUFD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3118EUFD#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 LTC3118EUFD#PBF?
For technical support, including LTC3118EUFD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3118EUFD#PBF requirements.
6.How does Aetrix verify that LTC3118EUFD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3118EUFD#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 LTC3118EUFD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3118EUFD#PBF?
All LTC3118EUFD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3118EUFD#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 LTC3118EUFD#PBF part is unused and in its original packaging.
Return procedure for LTC3118EUFD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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