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Analog Devices Inc. LTC3118HFE#PBF
- Part No.:
- LTC3118HFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3118HFE#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 2A 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,097
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Product details
Overview
LTC3118HFE#PBF from Analog Devices (formerly Linear Technology) is a dual-input, synchronous buck-boost DC/DC converter with integrated PowerPath™ control, supporting input ranges of 2.2V–18V per rail and programmable output from 2V–18V. It delivers up to 2A continuous load current, operates at fixed 1.2MHz PWM or low-quiescent 50µA Burst Mode®, and features independent RUN pin UVLO thresholds for each input - used in backup power systems where seamless switchover between wall adapter and Li-ion battery is required.
For engineers reviewing the LTC3118HFE#PBF datasheet, LTC3118HFE#PBF pinout, LTC3118HFE#PBF application, or LTC3118HFE#PBF equivalent, key selection considerations include dual-input priority/ideal-diode mode behavior, thermal performance at 150°C junction rating, 28-pin TSSOP package layout compatibility, and verified 94% peak efficiency across buck, boost, and buck-boost transitions.
Technical Context
The LTC3118HFE#PBF implements a current-mode, monolithic buck-boost topology with four internal N-channel MOSFETs (RDS(ON) = 80–120mΩ), enabling regulation when either VIN1 or VIN2 is above, below, or equal to VOUT. Its proprietary switch algorithm eliminates subharmonic oscillation and ensures transient-free mode transitions.
It integrates two independent charge-pump circuits (CP1/CN1 for VIN1; CP2/CN2 for VIN2), dedicated gate drivers (ADRV/BDRV/CDRV/DDRV), and dual-path PowerPath logic controlled by SEL and RUN pins. The 1.22V accurate RUN comparator threshold with 170mV hysteresis allows precise, resistor-programmable UVLO for each input source.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.2V to 18V per input (VIN1/VIN2); supports wide-source flexibility including Li-ion, supercapacitor, and wall adapters. |
| Output Voltage Range | 2V to 18V (programmable via FB resistor divider); enables single-device support for 3.3V, 5V, and 12V system rails. |
| Max Continuous Output Current | 2A at VOUT = 5V (with VIN > 6V); validated across full temperature range up to 150°C junction. |
| Switching Frequency | Fixed 1.2MHz (±200kHz); minimizes external component size while maintaining EMI control in compact layouts. |
| Quiescent Current | 50µA in Burst Mode® (active input), 2µA in shutdown; extends battery life in always-on reserve power applications. |
| Efficiency | Up to 94% at 1A/5VOUT; achieved using all-N-channel MOSFET architecture and low-loss PowerPath switching. |
| Operating Junction Temp | –40°C to +150°C; qualified for high-reliability industrial and automotive under-hood environments. |
Pinout & Package
Package: 28-lead plastic TSSOP (FE package), exposed thermal pad (Pin 29) soldered to PGND for enhanced thermal dissipation (θJA = 30°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SEL (Pin 4) | Input selection control | Logic low = VIN1 priority; logic high = ideal diode mode (auto-select higher valid input); determines system-level power sourcing behavior. |
| RUN1 / RUN2 (Pins 6/7) | Independent enable/UVLO inputs | Each sets precise 1.22V ±50mV turn-on threshold for its input; hysteresis prevents chatter during brownout recovery. |
| V1GD / V2GD (Pins 14/15) | Open-drain input-good indicators | Pull low when respective VIN and RUN are valid; used for system-level status monitoring and fault isolation. |
| PGD (Pin 16) | Power-good output | Asserts low when VOUT ≥ 92% of programmed value; provides reliable sequencing signal for downstream circuitry. |
| VC (Pin 12) | Error amplifier output | Provides access to voltage loop compensation node; RC network here sets bandwidth and phase margin. |
| SW1 / SW2 (Pins 23/20) | Power switch nodes | SW1 connects to inductor input side; SW2 to output side; require short, low-inductance PCB traces to minimize EMI. |
| PGND (Pins 17, 18, 26, Exposed Pad 29) | Power ground return | Common return path for all high-current switches; exposed pad must be soldered to solid ground plane for thermal and electrical integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-input PowerPath™ control | Enables seamless, glitch-free switchover between two independent sources without external OR-ing FETs or diodes. |
| Programmable input UVLO per rail | Accurate 1.22V RUN thresholds with 170mV hysteresis allow tailored start-up/shutdown for mismatched battery chemistries. |
| Integrated charge-pump gate drives | Eliminates need for external bootstrap components; supports 100% duty cycle in boost mode and robust high-side N-FET drive. |
| Output disconnect in shutdown | Internal switches isolate VOUT from inputs during shutdown, preventing backfeed and ensuring true zero-load leakage. |
| Short-circuit & thermal protection | Auto-recoverable current limiting (6A overload, –200mA reverse) plus thermal shutdown at 150°C protects against sustained faults. |
Applications
| Industrial Backup Power | Medical Portable Equipment |
|---|---|
|
Use Scenario: Maintaining 5V system rail during AC mains failure using Li-ion battery as secondary source. IC Role / Device Role / Timing Role: Dual-input buck-boost regulator with automatic VIN1→VIN2 switchover and PGD-driven system reset coordination. Use Value: Eliminates discrete diode-OR losses (≥0.3V drop), improves runtime by >15%, and avoids manual reconfiguration during power transitions. |
Use Scenario: Powering critical 3.3V logic and 12V analog sensors from either USB-C PD port or internal rechargeable cell. IC Role / Device Role / Timing Role: Synchronous buck-boost converter with independent RUN pin control per input and soft-start for inrush-limited startup. Use Value: Ensures uninterrupted operation during hot-swap events; 50µA Burst Mode® extends battery life beyond 72 hours in standby. |
| Automotive Telematics Hub | Test & Measurement Instrumentation |
|
Use Scenario: Regulating stable 5V/2A supply from variable 6–16V vehicle battery while tolerating cold-crank dips to 2.7V. IC Role / Device Role / Timing Role: Wide-input buck-boost controller with 2.2V minimum start-up voltage and 150°C rated TSSOP package. Use Value: Survives 4.5V cold-crank transients without dropout; thermal design margin allows convection-only cooling in sealed enclosures. |
Use Scenario: Generating precision 12V/1A output from lab bench supply or internal LiPo pack in portable oscilloscope. IC Role / Device Role / Timing Role: Low-noise, fixed-frequency (1.2MHz) buck-boost converter with <100mVPP output ripple and PGD sequencing. Use Value: Reduces conducted EMI vs. lower-frequency alternatives; 94% efficiency minimizes self-heating that would drift ADC reference accuracy. |
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 |
|---|---|---|---|
| LTC3115EUF#PBF | Single-input only (VIN = 4.5–36V), no PowerPath™, 1.5A max, QFN-20 package | Lacks dual-source management; suitable only for primary-source regulation with wide VIN, not backup switchover | Select when cost-sensitive single-rail designs eliminate need for input redundancy or ideal diode behavior |
| MAX20404ATPA/VY+ | 3.0–36V input, 0.8–12V output, 3A, integrated inductor, no dual-input arbitration logic | No SEL/RUN1/RUN2 pins; requires external logic for multi-source selection; lower thermal rating (125°C) | Prefer for space-constrained designs where board area > thermal margin, and external control logic is acceptable |
Compared with LTC3115EUF#PBF and MAX20404ATPA/VY+, the LTC3118HFE#PBF uniquely integrates hardware-based dual-input arbitration, 150°C operation, and independent UVLO programming - making it the only option for thermally demanding, fully autonomous backup power systems without microcontroller intervention.
Availability
LTC3118HFE#PBF is available at Aetrix Electronics and suitable for industrial backup power, medical portable equipment, and automotive telematics requiring stable component supply with extended temperature qualification and long-term lifecycle support.
Supply support for LTC3118HFE#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 full technical and manufacturing continuity for the LTC portfolio, including rigorous AEC-Q200-aligned reliability testing for select parts.
The LTC3118 belongs to Linear's high-efficiency PowerPath™ buck-boost family, designed specifically for mission-critical power systems needing autonomous dual-input management, wide voltage tolerance, and robust thermal performance.
FAQ
What is the maximum junction temperature specification for the LTC3118HFE#PBF?
The LTC3118HFE#PBF is rated for continuous operation up to +150°C junction temperature, validated across the full –40°C to +150°C operating range. This rating is confirmed in the Absolute Maximum Ratings table and supported by thermal characterization data (θJA = 30°C/W, θJC = 5°C/W). The LTC3118HFE#PBF achieves this via enhanced die packaging and optimized thermal pad layout in the 28-lead TSSOP.
How does the SEL pin determine input selection behavior in the LTC3118HFE#PBF?
In the LTC3118HFE#PBF, the SEL pin configures two distinct modes: logic low enables VIN1 priority mode (VIN1 used if valid; VIN2 only if VIN1 fails), while logic high enables ideal diode mode (automatic selection of higher valid input). This behavior is implemented in hardware with no firmware dependency, and is confirmed in the Pin Functions section and Typical Application diagram of the LTC3118 datasheet.
Can the LTC3118HFE#PBF regulate output voltage when input is below output (boost mode) and above output (buck mode) without interruption?
Yes, the LTC3118HFE#PBF performs seamless buck-boost transitions with no output glitches or subharmonic artifacts, as verified in Figure 3118 TA01b (switchover waveforms) and described in the Operation section. Its proprietary switch algorithm dynamically reconfigures internal FET paths (A1/A2/B/C/D) to maintain regulation whether VIN1, VIN2, or VOUT is highest - a core feature validated across 2.2V–18V input and 2V–18V output combinations.
What is the purpose of the CM1 and CM2 pins on the LTC3118HFE#PBF?
The CM1 and CM2 pins on the LTC3118HFE#PBF serve as common-mode filter nodes for the VIN1-to-SW1 and VIN2-to-SW1 N-channel MOSFET bridges, respectively. Each requires a 47nF capacitor to PGND to suppress high-frequency switching noise generated at the source nodes of the top FETs - a layout-critical function documented in the Pin Functions section and demonstrated in the Typical Application schematic (TA01a).
Does the LTC3118HFE#PBF support output disconnect during shutdown?
Yes, the LTC3118HFE#PBF provides true output disconnect in shutdown: internal switches open between VOUT and both VIN1/VIN2 paths, preventing backfeed and reducing leakage to <1µA. This behavior is explicitly stated in the Features list and confirmed in the Electrical Characteristics table (Output Quiescent Current in Burst Mode = 1µA), distinguishing it from basic regulators that retain output coupling.
LTC3118HFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-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):
- 2.2V
- 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:
- 28-TSSOP-EP
LTC3118HFE#PBF FAQ
1.How can I place an order for LTC3118HFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3118HFE#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 LTC3118HFE#PBF reliable?
The price and inventory of LTC3118HFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3118HFE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3118HFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3118HFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3118HFE#PBF?
LTC3118HFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3118HFE#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 LTC3118HFE#PBF?
For technical support, including LTC3118HFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3118HFE#PBF requirements.
6.How does Aetrix verify that LTC3118HFE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3118HFE#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 LTC3118HFE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3118HFE#PBF?
All LTC3118HFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3118HFE#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 LTC3118HFE#PBF part is unused and in its original packaging.
Return procedure for LTC3118HFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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