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Analog Devices Inc. LTC3118MPFE#TRPBF
- Part No.:
- LTC3118MPFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3118MPFE#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 2A 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,427
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Product details
Overview
LTC3118MPFE#TRPBF 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 in PWM or Burst Mode with 1.2MHz fixed frequency - used in backup power systems requiring high-efficiency source selection and rail flexibility.
For engineers reviewing the LTC3118MPFE#TRPBF datasheet, LTC3118MPFE#TRPBF pinout, LTC3118MPFE#TRPBF application, or LTC3118MPFE#TRPBF equivalent, key selection criteria include dual-input UVLO programming via RUN1/RUN2, ±50µA light-load quiescent current in Burst Mode, -55°C to 150°C extended temperature rating, and 28-lead TSSOP thermal performance with exposed PGND pad.
Technical Context
The LTC3118MPFE#TRPBF implements a current-mode, monolithic buck-boost topology with independent N-channel MOSFET switch paths for VIN1→SW1 and VIN2→SW1, enabling true input source isolation and ideal diode or priority mode selection via the SEL pin. Its proprietary switch algorithm maintains regulation across VIN < VOUT, VIN = VOUT, and VIN > VOUT without subharmonics or transients.
It integrates a 3.8V internal VCC regulator, accurate 1.22V RUN comparators with 170mV hysteresis per input, open-drain power-good indicators (V1GD/V2GD/PGD), and soft-start with 1ms typical ramp. Thermal protection triggers at TJ = 150°C, and shutdown draws only 2µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.2V to 18V per input (VIN1 or VIN2); enables compatibility with Li-ion, supercapacitors, wall adapters, and industrial rails. |
| Output Voltage Range | 2V to 18V (programmable via FB resistor divider); supports 3.3V, 5V, and 12V system rails from single IC. |
| Max Output Current | 2A continuous (at 5VOUT with VIN > 6V); verified under thermal limits in 28-lead TSSOP package. |
| Switching Frequency | Fixed 1.2MHz (±200kHz); minimizes external inductor/capacitor size while maintaining EMI control. |
| IQ in Burst Mode | 50µA (active input, FB = 1.2V); enables multi-day battery operation in low-duty-cycle IoT sensors. |
| Operating Temp Range | –55°C to +150°C junction; qualified for aerospace, downhole, and military embedded applications. |
| Efficiency Peak | Up to 94% (measured at 5VOUT/1A, VIN = 12V); achieved using all-N-channel MOSFETs with RDS(ON) ≤ 120mΩ. |
Pinout & Package
The LTC3118MPFE#TRPBF is housed in a thermally enhanced 28-lead plastic TSSOP package with exposed PGND pad (Pin 29) requiring PCB soldering for thermal and electrical integrity. θJA = 30°C/W, θJC = 5°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SEL (Pin 4) | Input Selection Control | Logic-low = VIN1 priority; logic-high = ideal diode mode selecting higher valid input; enables flexible source arbitration without external logic. |
| RUN1 / RUN2 (Pins 6, 7) | UVLO Enable & Threshold Programming | Each provides accurate 1.22V threshold (±50mV) with 170mV hysteresis; resistor dividers allow independent start-up voltage setting per input rail. |
| V1GD / V2GD / PGD (Pins 14, 15, 16) | Open-Drain Status Indicators | V1GD asserts when VIN1 & RUN1 valid; V2GD when VIN2 & RUN2 valid; PGD asserts when VOUT ≥ 92% of programmed value - simplifies system monitoring. |
| VC (Pin 12) | Error Amplifier Output | Provides access to voltage loop compensation node; RC network from VC to GND sets loop stability for wide input/output combinations. |
| CP1/CN1 & CP2/CN2 (Pins 3,2,25,27) | Charge-Pump Capacitor Terminals | Drive gate charge for high-side N-MOSFETs; require 10nF ceramic caps; CNx pins toggle between VCC/GND to indicate active input source. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-input PowerPath™ architecture | Enables seamless switchover between two independent sources (e.g., battery + wall adapter) with no output glitch or hold-up capacitor needed. |
| Programmable input UVLO per rail | RUN1/RUN2 pins support resistor-divider configuration to set distinct turn-on thresholds (e.g., 2.7V for Li-ion, 9V for auxiliary supply), preventing brownout on weak sources. |
| Low-noise 1.2MHz fixed-frequency PWM | Eliminates variable-frequency artifacts in sensitive analog/RF circuits; allows predictable EMI filtering and smaller magnetics vs. spread-spectrum alternatives. |
| 2µA shutdown current | Supports ultra-low-power deep-sleep states in portable equipment; enables full system power gating without leakage concerns. |
| Integrated VCC LDO (3.8V) | Self-powered gate drivers eliminate need for external bias supply; VCC can be back-driven up to 5.5V for hybrid power architectures. |
Applications
| Industrial Backup Power | Military Portable Radios |
|---|---|
Use Scenario: Maintaining 5V/2A system rail during primary power failure using supercapacitor bank charged from 12V main supply. IC Role / Device Role / Timing Role: Dual-input buck-boost converter with automatic VIN2 (supercap) takeover when VIN1 (12V rail) drops below programmed UVLO. Use Value: Eliminates discrete diode-OR + boost converter solution, reducing BOM count by 7 parts and improving efficiency from 78% to 92% at 1A load. | Use Scenario: Powering RF transceiver and baseband processor from either Li-ion battery (3.0–4.2V) or vehicle 24V system via isolated DC/DC. IC Role / Device Role / Timing Role: Input-flexible regulator delivering stable 3.3V/1.5A with cold-temperature operation down to –55°C. Use Value: Enables single-board design across air/ground platforms; extended temp rating avoids derating or heatsinking in sealed enclosures. |
| Medical Patient Monitor | Test & Measurement Equipment |
Use Scenario: Providing noise-sensitive 12V analog front-end supply from dual inputs: USB 5V (during bench use) and internal 3.7V LiPo (field operation). IC Role / Device Role / Timing Role: Low-ripple buck-boost converter operating in fixed PWM mode to suppress switching noise near ADC references. Use Value: Achieves <10mVPP output ripple at 12V/500mA, meeting EN 60601-1 conducted emission limits without additional LC filtering. | Use Scenario: Generating precise 5V/2A digital rail from variable lab supply (5–18V) while maintaining clean sequencing with FPGA core voltage. IC Role / Device Role / Timing Role: Programmable-output regulator with PGD signal synchronized to VOUT regulation for safe FPGA configuration. Use Value: PGD assertion within 100µs of VOUT reaching 92% of target enables deterministic power-on reset timing, eliminating boot failures. |
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#TRPBF | Single-input (2.7–36V), no PowerPath; 1.1MHz, 1.5A max; QFN-24 package; –40°C to 125°C. | Lacks dual-source arbitration and ideal diode mode; suitable only where one input suffices. | Select when cost sensitivity outweighs source redundancy needs and ambient temperature stays above –40°C. |
| MAX20404ATPA/VY+ | Single-input (2.5–16V), 3A, 2.2MHz; integrated FETs; 20-pin TQFN; –40°C to 125°C; no RUN-programmable UVLO. | No dual-input capability or independent input enable; higher frequency reduces inductor size but increases EMI risk. | Choose for space-constrained designs needing >2A and faster transient response, accepting loss of input flexibility. |
Compared with LTC3115IUFD#TRPBF and MAX20404ATPA/VY+, the LTC3118MPFE#TRPBF uniquely supports cold-temperature dual-input switchover with user-defined UVLO per rail - critical for field-deployed systems requiring uninterrupted operation across diverse power sources and environments.
Availability
LTC3118MPFE#TRPBF is available at Aetrix Electronics and suitable for industrial backup power, military portable radios, medical patient monitors, and test & measurement equipment requiring stable component supply across extreme temperature ranges and long production lifecycles.
Supply support for LTC3118MPFE#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-reliability power management portfolio with rigorous qualification standards for aerospace, defense, and industrial markets.
The LTC3118MPFE#TRPBF belongs to Linear's PowerPath™ buck-boost family, engineered specifically for mission-critical systems demanding seamless dual-input power arbitration, extended temperature operation, and minimal external components.
FAQ
What is the maximum junction temperature specification for the LTC3118MPFE#TRPBF?
The LTC3118MPFE#TRPBF is fully tested and guaranteed over a junction temperature range of –55°C to +150°C. Its thermal shutdown activates at TJ = 150°C, and the package features θJA = 30°C/W (TSSOP). Derating guidelines in the datasheet specify maximum ambient temperature based on board layout and power dissipation - for example, at 2A/5VOUT with 12V input, ambient must remain ≤ 85°C on a 4-layer demo board to maintain TJ < 150°C. The LTC3118MPFE#TRPBF is qualified for downhole and avionics applications where sustained high-temperature operation is required.
How does the SEL pin configure input selection behavior in the LTC3118MPFE#TRPBF?
The SEL pin on the LTC3118MPFE#TRPBF determines whether the device operates in VIN1 priority mode (SEL = low) or ideal diode mode (SEL = high). In priority mode, VIN1 powers VOUT if RUN1 and VIN1 exceed thresholds; otherwise, VIN2 takes over. In ideal diode mode, the higher valid input (VIN1 or VIN2) automatically supplies VOUT, provided its RUN pin is enabled and voltage exceeds UVLO. This eliminates external OR-ing controllers and ensures zero reverse current. The LTC3118MPFE#TRPBF implements this using independent charge-pump circuits (CP1/CN1 and CP2/CN2) that drive high-side N-MOSFETs only for the active input.
Can the LTC3118MPFE#TRPBF generate 5V output from a 3.3V input, and what efficiency can be expected?
Yes, the LTC3118MPFE#TRPBF supports boost operation from 3.3V to 5V output. At 500mA load and TA = 25°C, typical efficiency is 89% (per Figure G07 in the datasheet), dropping to ~85% at 1A due to conduction losses in the 120mΩ VIN2-to-SW1 MOSFET. Efficiency improves to 92%+ when using VIN1 (lower RDS(ON)) or increasing input voltage to 5V. The LTC3118MPFE#TRPBF maintains regulation without mode switching artifacts, making it suitable for powering 5V USB peripherals from low-voltage batteries.
What is the purpose of the CM1 and CM2 pins on the LTC3118MPFE#TRPBF, and how should they be connected?
CM1 and CM2 are filter pins for the common-source nodes of the VIN1→SW1 and VIN2→SW1 N-channel MOSFET pairs, respectively. Each requires a 47nF ceramic capacitor connected to PGND to suppress high-frequency gate-drive noise and prevent false triggering of current-sense comparators. These capacitors stabilize the switch-node reference during fast transitions and reduce EMI emissions. Incorrect or missing CM1/CM2 caps may cause erratic switching or reduced efficiency. The LTC3118MPFE#TRPBF datasheet specifies placement within 2mm of the IC and direct routing to the exposed PGND pad for optimal performance.
Does the LTC3118MPFE#TRPBF support output disconnect during shutdown?
Yes, the LTC3118MPFE#TRPBF provides true output disconnect in shutdown mode. When both RUN1 and RUN2 are pulled below 0.2V, internal N-MOSFETs between SW2 and VOUT are turned off, isolating the output from the power stage. This prevents backfeed from VOUT into the converter and protects downstream circuitry. The datasheet confirms <1µA output leakage in shutdown, and the feature is implemented without requiring external MOSFETs or controllers. This behavior is inherent to the LTC3118MPFE#TRPBF's integrated PowerPath architecture and applies regardless of input source or SEL configuration.
LTC3118MPFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width) 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:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSSOP-EP
LTC3118MPFE#TRPBF FAQ
1.How can I place an order for LTC3118MPFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3118MPFE#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 LTC3118MPFE#TRPBF reliable?
The price and inventory of LTC3118MPFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3118MPFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3118MPFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3118MPFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3118MPFE#TRPBF?
LTC3118MPFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3118MPFE#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 LTC3118MPFE#TRPBF?
For technical support, including LTC3118MPFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3118MPFE#TRPBF requirements.
6.How does Aetrix verify that LTC3118MPFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3118MPFE#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 LTC3118MPFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3118MPFE#TRPBF?
All LTC3118MPFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3118MPFE#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 LTC3118MPFE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3118MPFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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