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Analog Devices Inc. LTC3118MPFE#PBF
- Part No.:
- LTC3118MPFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3118MPFE#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 2A 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,955
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Product details
Overview
LTC3118MPFE#PBF from Analog Devices (formerly Linear Technology) is a dual-input, wide-input-range 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 transitions, and operates across –55°C to +150°C for aerospace and military power systems.
For engineers reviewing the LTC3118MPFE#PBF datasheet, LTC3118MPFE#PBF pinout, LTC3118MPFE#PBF application, or LTC3118MPFE#PBF equivalent, key selection criteria include dual-input priority/ideal-diode mode operation, 1.2MHz fixed-frequency PWM or low-quiescent 50µA Burst Mode, ±1.22V accurate RUN thresholds, 94% peak efficiency, and TSSOP-28 package suitability for high-reliability thermal management.
Technical Context
The LTC3118MPFE#PBF implements a current-mode, monolithic buck-boost topology with four internal N-channel MOSFETs (RDS(ON) = 80–120mΩ) and independent gate drivers for VIN1→SW1 and VIN2→SW1 paths. Its proprietary switch algorithm enables continuous regulation when input voltage is above, below, or equal to VOUT without subharmonic oscillation or output transients.
It integrates dual charge-pump circuits (CP1/CN1 for VIN1; CP2/CN2 for VIN2), two independent RUN comparators with 170mV hysteresis, and open-drain power-good indicators (V1GD/V2GD/PGD). The 1.2MHz oscillator features <0.1%/V line sensitivity and supports pin-selectable PWM or Burst Mode via MODE pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | VIN1 or VIN2: 2.2V to 18V - supports Li-ion, supercapacitor, wall adapter, and industrial rail inputs without external pre-regulation. |
| Output Voltage Range | 2V to 18V - programmable via FB resistor divider; enables single converter to replace multiple fixed-output regulators. |
| Max Output Current | 2A continuous - sustained at 5V/12V outputs with appropriate inductor and layout; limited by internal 3.6A average inductor current threshold. |
| Quiescent Current | 50µA in Burst Mode, 2µA in shutdown - extends battery life in always-on backup systems and low-power telemetry nodes. |
| Switching Frequency | 1.2MHz nominal - enables compact 3.3µH–6.8µH inductors and minimizes EMI filtering requirements in space-constrained designs. |
| Operating Temp Range | –55°C to +150°C - fully tested and guaranteed for extended temperature applications including avionics, downhole tools, and engine control units. |
| Efficiency | Up to 94% - achieved at mid-load with optimized MOSFET RDS(ON) and low-loss PowerPath architecture; reduces thermal stress in sealed enclosures. |
Pinout & Package
The LTC3118MPFE#PBF is housed in a 28-lead plastic TSSOP package (JEDEC MO-153) with exposed PGND pad (Pin 29) for enhanced thermal dissipation and low-impedance grounding. θJA = 30°C/W on 4-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SEL (Pin 4) | Input source selection control | Logic low = VIN1 priority; logic high = ideal diode mode selecting higher valid input - enables flexible redundancy without external OR-ing FETs. |
| RUN1/RUN2 (Pins 6/7) | Independent enable & UVLO programming inputs | Each sets precise 1.22V threshold with 170mV hysteresis; resistor dividers allow custom start-up voltages per input source. |
| V1GD/V2GD/PGD (Pins 14/15/16) | Open-drain status indicators | Pull low when respective input is valid (V1GD/V2GD) or VOUT ≥92% of target (PGD); drive LEDs or microcontroller GPIOs directly. |
| VC (Pin 12) | Error amplifier output | Provides access to compensation node; RC network from VC to GND sets voltage loop stability - critical for transient response tuning. |
| CP1/CN1 & CP2/CN2 (Pins 3/2/25/27) | Charge-pump capacitor terminals | Drive gate voltages for high-side N-FETs; require 10nF ceramic caps placed adjacent to IC - essential for reliable 18V switching capability. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-input PowerPath™ control | Enables automatic switchover between primary and backup sources (e.g., battery + wall adapter) with no external diodes or controllers. |
| Seamless buck-boost transition | Maintains regulated VOUT during VIN crossing VOUT - eliminates output glitches in dynamic input scenarios like battery discharge or generator ramp-up. |
| Accurate, independent RUN thresholds | ±1.22V precision with 170mV hysteresis per input - ensures predictable turn-on/turn-off sequencing across temperature and supply variations. |
| Low-noise 1.2MHz fixed-frequency PWM | Minimizes EMI in sensitive RF/analog subsystems; avoids variable-frequency artifacts that complicate filter design and EMC certification. |
| Thermally enhanced TSSOP-28 | Exposed PGND pad and optimized copper layout support >2A continuous operation at 150°C junction temperature - validated for MIL-STD-883 Class B screening. |
Applications
| Aerospace Backup Power | Industrial Redundant Supplies |
|---|---|
Use Scenario: Primary bus failure triggers automatic switchover from main 28V aircraft bus to secondary 24V lithium-thionyl chloride battery. IC Role / Device Role / Timing Role: Dual-input buck-boost regulator maintaining 5V/2A for flight data recorder and inertial navigation sensors. Use Value: Eliminates discrete diode-OR + LDO solution, reducing BOM count by 7 parts and improving efficiency from 78% to 92% at 1A load. | Use Scenario: Programmable logic controller (PLC) powered simultaneously from 24V DC field bus and 12V backup supercapacitor bank. IC Role / Device Role / Timing Role: Seamless input selector and voltage regulator ensuring uninterrupted 3.3V/1.5A supply to ARM Cortex-M7 CPU during brownouts. Use Value: Achieves zero-downtime operation with <100ns switchover; replaces dual PMICs and external monitoring circuitry. |
| Downhole Telemetry Systems | Military Vehicle Power Management |
Use Scenario: Oil/gas wellhead sensor node operating in –40°C to +150°C ambient using dual input: 18V turbine generator and 3.6V Li-SOCl₂ battery. IC Role / Device Role / Timing Role: High-temp buck-boost converter generating stable 5V/1A for RF transceiver and pressure sensor ASIC. Use Value: Full –55°C to +150°C guaranteed operation eliminates derating; 50µA Burst Mode extends battery life to >5 years in sleep mode. | Use Scenario: Armored vehicle electronics rack requiring fault-tolerant 12V/2A supply from dual 24V military batteries with hot-swap capability. IC Role / Device Role / Timing Role: Input priority manager and step-down regulator supporting CAN FD communication, display, and weapon interface modules. Use Value: Ideal diode mode prevents backfeed between batteries; 94% efficiency reduces heat generation in confined chassis space. |
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 |
|---|---|---|---|
| LTC3115IUFD#PBF | Single-input only; 4.5V–40V input; no VIN2 path or SEL pin; QFN-24 package. | Cannot support redundant input architectures; suitable only for wide-VIN single-source systems. | Select only if dual-input functionality is unnecessary and higher input voltage (>18V) is required. |
| TPS63070DDCR | Single-input buck-boost; 2.5V–16V input; 2A max; no PowerPath or RUN threshold programming; SOT-563 package. | Lacks input prioritization, ideal diode mode, and precision UVLO - requires external logic for redundancy. | Consider for cost-sensitive commercial applications where extended temperature range and dual-input control are not needed. |
Compared with LTC3115IUFD#PBF and TPS63070DDCR, the LTC3118MPFE#PBF uniquely provides guaranteed –55°C to +150°C operation, dual independent RUN inputs with hysteresis, and hardware-based ideal diode selection - making it the only option for mission-critical redundant power in extreme environments.
Availability
LTC3118MPFE#PBF is available at Aetrix Electronics and suitable for aerospace backup power, industrial redundant supplies, downhole telemetry systems, and military vehicle power management requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3118MPFE#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 product support, qualification, and manufacturing continuity for all Linear power management ICs.
The LTC3118MPFE#PBF belongs to Linear's PowerPath™ buck-boost family, designed specifically for high-reliability dual-input power systems in aerospace, defense, and industrial applications demanding extended temperature operation and seamless source switchover.
FAQ
What is the guaranteed operating temperature range for the LTC3118MPFE#PBF?
The LTC3118MPFE#PBF is fully tested and guaranteed over –55°C to +150°C junction temperature. This extended range is validated per MIL-STD-883 methods and supports deployment in downhole tools, avionics, and engine-mounted electronics where standard commercial or industrial grade parts fail.
How does the LTC3118MPFE#PBF implement ideal diode mode versus VIN1 priority mode?
The LTC3118MPFE#PBF uses the SEL pin to select mode: logic high enables ideal diode mode (selects higher valid VIN), logic low enables VIN1 priority mode (uses VIN1 if valid, falls back to VIN2 only if VIN1 fails). Both modes use independent RUN1/RUN2 thresholds and internal low-RDS(ON) N-FETs - no external components required.
Can the LTC3118MPFE#PBF generate 5V at 2A from a 3.6V Li-SOCl₂ battery input?
Yes - the LTC3118MPFE#PBF supports boost operation from 2.2V minimum input. At 3.6V→5V/2A, typical efficiency is 89% (per Fig G04/G07), delivering >1.8A continuous under worst-case –55°C conditions with proper thermal design and 3.3µH inductor.
What is the function of the CM1 and CM2 pins on the LTC3118MPFE#PBF?
CM1 and CM2 are common-mode filter pins for the VIN1→SW1 and VIN2→SW1 N-channel MOSFET paths. Each requires a 47nF capacitor to PGND to suppress high-frequency gate-drive noise and prevent false triggering of internal current sensing - critical for stable operation at 1.2MHz switching frequency.
Does the LTC3118MPFE#PBF support output disconnect during shutdown?
Yes - the LTC3118MPFE#PBF includes controlled output disconnect in shutdown mode. When both RUN1 and RUN2 are pulled below 0.2V, internal switches isolate VOUT from VIN1/VIN2 paths, reducing leakage to <1µA and preventing backfeed into failed input sources - essential for system-level safety compliance.
LTC3118MPFE#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:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSSOP-EP
LTC3118MPFE#PBF FAQ
1.How can I place an order for LTC3118MPFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3118MPFE#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 LTC3118MPFE#PBF reliable?
The price and inventory of LTC3118MPFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3118MPFE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3118MPFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3118MPFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3118MPFE#PBF?
LTC3118MPFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3118MPFE#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 LTC3118MPFE#PBF?
For technical support, including LTC3118MPFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3118MPFE#PBF requirements.
6.How does Aetrix verify that LTC3118MPFE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3118MPFE#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 LTC3118MPFE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3118MPFE#PBF?
All LTC3118MPFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3118MPFE#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 LTC3118MPFE#PBF part is unused and in its original packaging.
Return procedure for LTC3118MPFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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