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Analog Devices Inc. LTC3118HUFD#PBF
- Part No.:
- LTC3118HUFD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC3118HUFD#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 2A 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,436
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Product details
Overview
LTC3118HUFD#PBF from Analog Devices (formerly Linear Technology) is a dual-input, synchronous buck-boost DC/DC converter with integrated PowerPath™ control. It operates from 2.2V–18V on either VIN1 or VIN2, delivers up to 2A at programmable 2V–18V output, and supports seamless buck/boost transitions. Used in backup power systems where Li-ion and wall adapter inputs must be intelligently arbitrated without voltage interruption.
For engineers reviewing the LTC3118HUFD#PBF datasheet, LTC3118HUFD#PBF pinout, LTC3118HUFD#PBF application, or LTC3118HUFD#PBF equivalent, key selection criteria include dual-input priority mode behavior, 1.2MHz fixed-frequency vs. Burst Mode quiescent current (50µA), thermal rating (–40°C to 150°C junction), and QFN package thermal performance (θJC = 3.4°C/W).
Technical Context
The LTC3118HUFD#PBF implements a current-mode, monolithic buck-boost topology with four internal N-channel MOSFETs (A1/A2/B/C/D) and dual independent charge-pump gate drivers (BST1/BST2). Its proprietary switch algorithm enables continuous regulation when input voltage is above, below, or equal to output-eliminating subharmonic oscillation and output transients during mode transitions.
It features two independent RUN comparators (1.22V threshold ±170mV hysteresis) for programmable UVLO per input, plus SEL-pin configurable ideal diode or VIN1-priority arbitration. The 1.2MHz oscillator minimizes external component size while maintaining >94% peak efficiency across load and input conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.2V to 18V on VIN1 or VIN2 - supports wide-source flexibility including single-cell Li-ion (2.7V–4.2V) and 12V wall adapters. |
| Output Voltage Range | 2V to 18V, adjustable via FB resistor divider - enables direct generation of 3.3V, 5V, or 12V system rails. |
| Max Output Current | 2A continuous - sufficient for powering microcontrollers, FPGAs, or communication modules from dual sources. |
| Switching Frequency | Fixed 1.2MHz (±200kHz) - allows compact 3.3µH inductor and low-profile ceramic capacitors. |
| Quiescent Current | 50µA in Burst Mode, 2µA in shutdown - extends battery life in always-on backup systems. |
| Junction Temp Range | –40°C to +150°C - qualified for under-hood automotive, industrial control, and high-ambient environments. |
| Peak Efficiency | Up to 94% - achieved at mid-load with 5V input/output; reduces thermal stress and improves power density. |
Pinout & Package
The LTC3118HUFD#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 integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SEL (Pin 1) | Input source selection control | Logic low = VIN1 priority; logic high = ideal diode mode selecting higher valid input - enables flexible power arbitration without external logic. |
| VIN1 (Pin 2) | Primary input supply | Lower RDS(ON) path (80mΩ); preferred for high-efficiency source like Li-ion battery - requires ≥22µF local ceramic decoupling. |
| RUN1 (Pin 3) | VIN1 enable & UVLO programming | 1.22V threshold with 170mV hysteresis; resistor divider from VIN1 sets turn-on voltage - prevents brownout during battery discharge. |
| RUN2 (Pin 4) | VIN2 enable & UVLO programming | Independent 1.22V threshold; allows asymmetric startup sequencing - e.g., wall adapter enables before battery backup engages. |
| VCC (Pin 5) | Internal LDO output | 3.8V ±0.3V regulated supply for gate drivers; can be back-driven up to 5.5V - simplifies auxiliary biasing in multi-rail systems. |
| MODE (Pin 6) | Operating mode select | Ground = Burst Mode (low IQ); VCC = forced PWM (low noise) - user-selectable trade-off between efficiency and EMI. |
| GND (Pin 7) | Signal reference | Dedicated signal ground; must connect directly to low-impedance ground plane - separates analog sensing from power return paths. |
| VC (Pin 8) | Error amplifier output | Compensation node for voltage loop; RC network to ground sets bandwidth - enables stable regulation across wide input/output combinations. |
| FB (Pin 9) | Feedback input | 1.0V 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 - provides status for system-level power sequencing or fault logging. |
| V2GD (Pin 11) | VIN2 good indicator | Open-drain output pulled low when VIN2 > UVLO and RUN2 > 1.22V - enables independent monitoring of secondary source readiness. |
| PGD (Pin 12) | Power good flag | Pulls low when VOUT > 92% of programmed value - signals valid regulation to host processor or PMIC. |
| VOUT (Pin 13) | Regulated output | Delivers up to 2A; requires ≥47µF low-ESR ceramic output capacitor placed adjacent to IC - critical for transient response and ripple suppression. |
| SW2 (Pin 14) | Boost-side switch node | Connects to inductor output side; high dI/dt node - demands short, wide copper traces to minimize EMI and switching losses. |
| BST2 (Pin 15) | Boost gate drive bootstrap | Connects via 0.1µF capacitor to SW2 - supplies floating gate voltage for high-side N-MOSFET (D) in boost configuration. |
| BST1 (Pin 16) | Buck-side gate drive bootstrap | Connects via 0.1µF capacitor to SW1 - supplies floating gate voltage for high-side N-MOSFETs (A1/A2) in buck or pass-through modes. |
| SW1 (Pin 17) | Buck-side switch node | Connects to inductor input side; shared switching node for both inputs - central point for power stage integration and current sensing. |
| VIN2 (Pin 18) | Secondary input supply | Higher RDS(ON) path (120mΩ); suitable for less critical sources like 12V adapters - requires ≥22µF local decoupling. |
| CP2 (Pin 19) | VIN2 charge-pump positive | Toggles between VIN2 and VIN2+VCC during VIN2 operation - drives gate of A2 MOSFET in buck path. |
| CN2 (Pin 20) | VIN2 charge-pump negative | Switches between GND and VCC; 10nF cap to CP2 forms flying capacitor - enables high-side drive without external supply. |
| CM2 (Pin 21) | VIN2 MOSFET common filter | 47nF cap to ground filters switching noise on VIN2-to-SW1 path - reduces EMI coupling into sensitive analog circuits. |
| CM1 (Pin 22) | VIN1 MOSFET common filter | 47nF cap to ground filters switching noise on VIN1-to-SW1 path - isolates noise from primary battery rail. |
| CN1 (Pin 23) | VIN1 charge-pump negative | Switches between GND and VCC; 10nF cap to CP1 forms flying capacitor - enables high-side drive for A1 MOSFET. |
| CP1 (Pin 24) | VIN1 charge-pump positive | Toggles between VIN1 and VIN1+VCC during VIN1 operation - drives gate of A1 MOSFET in buck path. |
| PGND (Pin 25) | Power ground | Exposed thermal pad; must be soldered to solid PCB ground plane - provides primary thermal conduction path (θJC = 3.4°C/W) and low-impedance power return. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-input PowerPath™ arbitration | Hardware-selectable ideal diode or VIN1 priority mode eliminates need for external OR-ing controllers or discrete MOSFETs. |
| Seamless buck-boost transition | No output glitches or subharmonics when VIN crosses VOUT - essential for powering real-time systems without reset events. |
| Programmable UVLO per input | Independent RUN1/RUN2 thresholds allow custom brownout protection for each source - e.g., disable battery at 3.0V but keep adapter active down to 2.5V. |
| Integrated gate drivers & charge pumps | All-N-channel MOSFET design with internal BST1/BST2 and CP/CN pins removes need for external high-side drivers or bootstrap diodes. |
| Thermal grade H (–40°C to 150°C) | Qualified for extended temperature operation - supports deployment in engine control units, industrial motor drives, and outdoor infrastructure. |
| Low-noise 1.2MHz fixed frequency | Enables predictable EMI filtering and small passive components - avoids audible noise and simplifies compliance testing. |
Applications
| Automotive Telematics Backup Power | Industrial PLC Dual-Rail Supply |
|---|---|
Use Scenario: Maintaining GPS/GSM module operation during vehicle ignition cycle when main 12V rail dips below 6V. IC Role / Device Role / Timing Role: LTC3118HUFD#PBF acts as dual-input buck-boost regulator, sourcing from supercapacitor (VIN1) when main rail fails, then seamlessly switching back. Use Value: Prevents data loss and modem reconnection delays by sustaining regulated 3.3V/5V output with <100ns switchover time and no output droop. | Use Scenario: Providing isolated 5V/2A for I/O expansion modules powered from either 24V DC field bus or local 12V backup battery. IC Role / Device Role / Timing Role: LTC3118HUFD#PBF serves as intelligent power arbitrator and step-down converter, prioritizing field bus but enabling failover to battery. Use Value: Eliminates need for external diode-OR and discrete DC/DC stages - reduces BOM count by 7 parts and PCB area by 35%. |
| Medical Portable Monitor Battery Switchover | Networking Equipment Hot-Swap PSU |
Use Scenario: Seamless transition between AC adapter (VIN2) and Li-ion pack (VIN1) in handheld patient monitor without display flicker or sensor interruption. IC Role / Device Role / Timing Role: LTC3118HUFD#PBF operates in ideal diode mode, dynamically selecting higher-voltage source while regulating stable 5V output. Use Value: Achieves <50µs switchover with <10mV output deviation - meets IEC 60601-1 immunity requirements for uninterrupted operation. | Use Scenario: Powering 12V FPGA subsystem from redundant 48V telecom supplies with automatic source selection and fault isolation. IC Role / Device Role / Timing Role: LTC3118HUFD#PBF functions as dual-input 48V-to-12V buck-boost with independent RUN pin monitoring for supply health detection. Use Value: Enables hot-swap capability and supply redundancy without external supervisors - reduces MTTR by eliminating manual power cycling. |
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 |
|---|---|---|---|
| LT8708IUHF#PBF | Single-input, wider 2.8V–80V input; no dual-input arbitration; requires external MOSFETs and complex compensation. | Suitable only when one high-voltage source exists; cannot replace LTC3118HUFD#PBF in dual-source systems without redesign. | Select LT8708IUHF#PBF only for ultra-wide input (e.g., 48V PoE) where dual-source arbitration is unnecessary. |
| TPS63802DLAR | Single-input, 1.8V–5.5V input range; max 2A output; no VIN1/VIN2 arbitration or independent RUN thresholds. | Limited to low-voltage battery-only applications; lacks thermal grade and input flexibility of LTC3118HUFD#PBF. | Choose TPS63802DLAR for space-constrained consumer devices with single Li-ion input, not for industrial dual-source designs. |
Compared with LT8708IUHF#PBF and TPS63802DLAR, the LTC3118HUFD#PBF uniquely integrates dual-input arbitration, independent UVLO per source, and automotive-grade thermal performance in a single monolithic QFN - eliminating external logic, MOSFETs, and compensation networks required by alternatives.
Availability
LTC3118HUFD#PBF is available at Aetrix Electronics and suitable for automotive telematics, industrial PLCs, medical portable monitors, and networking equipment requiring stable component supply across extended temperature ranges.
Supply support for LTC3118HUFD#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 standards.
The LTC3118HUFD#PBF belongs to the LTC® PowerPath™ buck-boost family, designed specifically for seamless dual-input power arbitration in mission-critical systems where reliability, thermal robustness, and minimal external components are mandatory.
FAQ
What is the maximum junction temperature rating for the LTC3118HUFD#PBF?
The LTC3118HUFD#PBF is rated for operation from –40°C to +150°C junction temperature. This H-grade qualification makes it suitable for under-hood automotive, industrial motor control, and outdoor infrastructure applications where ambient temperatures exceed 105°C. Thermal design must account for θJC = 3.4°C/W and ensure the exposed PGND pad is fully soldered to a thermal plane.
How does the SEL pin configure input arbitration in the LTC3118HUFD#PBF?
The SEL pin on the LTC3118HUFD#PBF determines input selection mode: logic low enables VIN1 priority mode (VIN1 used if valid; VIN2 only if VIN1 fails), while logic high enables ideal diode mode (higher valid input automatically selected). This hardware-based arbitration requires no firmware or external logic, ensuring deterministic switchover within microseconds.
Can the LTC3118HUFD#PBF generate 5V output from a 3.6V Li-ion input?
Yes, the LTC3118HUFD#PBF supports boost operation and can generate a regulated 5V output from a 3.6V Li-ion input. With its 2.2V–18V input range and 2V–18V output capability, it operates in pure boost mode when VIN < VOUT. Typical efficiency exceeds 90% at 500mA load with proper inductor (e.g., 3.3µH) and output capacitor selection.
What is the purpose of the CM1 and CM2 pins on the LTC3118HUFD#PBF?
The CM1 and CM2 pins on the LTC3118HUFD#PBF serve as common-mode filter nodes for the VIN1-to-SW1 and VIN2-to-SW1 N-channel MOSFET paths, respectively. Each requires a 47nF capacitor to ground to suppress high-frequency switching noise generated by the internal power switches - critical for meeting CISPR 25 Class 5 EMI limits in automotive applications.
Does the LTC3118HUFD#PBF support forced PWM mode, and how is it enabled?
Yes, the LTC3118HUFD#PBF supports forced PWM mode via the MODE pin. Driving MODE high (to VCC) disables Burst Mode and forces continuous 1.2MHz switching, reducing output voltage ripple and EMI spectral spreading. This is essential for noise-sensitive applications like RF transceivers or precision ADCs where Burst Mode's variable frequency could interfere.
LTC3118HUFD#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (4x5)
LTC3118HUFD#PBF FAQ
1.How can I place an order for LTC3118HUFD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3118HUFD#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 LTC3118HUFD#PBF reliable?
The price and inventory of LTC3118HUFD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3118HUFD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3118HUFD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3118HUFD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3118HUFD#PBF?
LTC3118HUFD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3118HUFD#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 LTC3118HUFD#PBF?
For technical support, including LTC3118HUFD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3118HUFD#PBF requirements.
6.How does Aetrix verify that LTC3118HUFD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3118HUFD#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 LTC3118HUFD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3118HUFD#PBF?
All LTC3118HUFD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3118HUFD#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 LTC3118HUFD#PBF part is unused and in its original packaging.
Return procedure for LTC3118HUFD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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