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Analog Devices Inc. LTC3118IFE#TRPBF
- Part No.:
- LTC3118IFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3118IFE#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 2A 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,167
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Product details
Overview
LTC3118IFE#TRPBF 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 inputs, delivers up to 2A at programmable 2V–18V output, and supports seamless buck/boost transitions - ideal for backup power systems using wall adapter + Li-ion or battery + supercapacitor inputs.
For engineers reviewing the LTC3118IFE#TRPBF datasheet, LTC3118IFE#TRPBF pinout, LTC3118IFE#TRPBF application, or LTC3118IFE#TRPBF equivalent, key selection criteria include VIN1/VIN2 priority mode behavior, 1.2MHz fixed-frequency vs. Burst Mode quiescent current (50µA), dual RUN pin UVLO programming, and 28-pin TSSOP thermal performance (θJA = 30°C/W).
Technical Context
The LTC3118IFE#TRPBF implements a current-mode, monolithic buck-boost topology with four internal N-channel MOSFETs (RDS(ON) ≤ 120mΩ) and independent gate drivers for VIN1→SW1 and VIN2→SW1 paths. Its proprietary switch algorithm enables continuous regulation when VIN1 or VIN2 is above, below, or equal to VOUT without subharmonic oscillation.
Control logic includes pin-selectable MODE (PWM/Burst), SEL (ideal diode/priority), and dual RUN pins with ±170mV hysteresis and 1.22V accurate threshold. Internal 3.8V VCC regulator powers gate drivers, while VC provides error amplifier output for loop compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.2V to 18V per input (VIN1 or VIN2); supports mixed-source systems like 5V adapter + 12V battery. |
| Output Voltage Range | 2V to 18V (programmed via FB resistor divider); enables single-device support for 3.3V, 5V, and 12V rails. |
| Max Output Current | 2A continuous at 5VOUT with VIN > 6V; limited by average inductor current (3.6A typ) and thermal design. |
| Switching Frequency | Fixed 1.2MHz (±200kHz); minimizes external component size while maintaining EMI control in noise-sensitive applications. |
| Quiescent Current | 50µA in Burst Mode (light load), 2µA in shutdown; extends runtime in battery-backed systems. |
| Efficiency | Up to 94% at 5VOUT/1A with 12VIN; enabled by low-RDS(ON) MOSFETs and optimized gate drive architecture. |
| Package | 28-lead plastic TSSOP (FE package); exposed pad (Pin 29) must be soldered to PGND for thermal and electrical integrity. |
Pinout & Package
Package: 28-Lead Plastic TSSOP (FE), –40°C to 125°C operating junction temperature, θJA = 30°C/W, exposed PGND pad (Pin 29) required for thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SEL (Pin 4) | Input selection control | Logic low = VIN1 priority; logic high = ideal diode mode (selects higher valid VIN); determines system-level power source arbitration. |
| RUN1 / RUN2 (Pins 6/7) | Enable & UVLO threshold programming | Each pin sets independent start-up voltage (1.22V typ) with 170mV hysteresis; resistor dividers enable custom input undervoltage lockout. |
| V1GD / V2GD (Pins 14/15) | Input good indicators | Open-drain outputs pulled low when respective VIN and RUN are valid; used for system status monitoring and fault isolation. |
| PGD (Pin 16) | Power good indicator | Asserts low when VOUT ≥ 92% of programmed value; provides reliable rail validation for downstream logic sequencing. |
| VC (Pin 12) | Error amplifier output | Provides compensation node for voltage loop; RC network to ground sets dominant pole and phase margin for stable regulation. |
| FB (Pin 13) | Feedback input | Connects to resistor divider from VOUT; sets output voltage as VOUT = 1.0V × (1 + R1/R2); 1% tolerance reference enables precise rail generation. |
| BST1 / BST2 (Pins 22/21) | Bootstrap supplies | Drive high-side N-MOSFET gates; require 0.1µF ceramic capacitors between BSTx and SWx for proper gate voltage boosting. |
| SW1 / SW2 (Pins 23/20) | Power switch nodes | SW1 connects to inductor input; SW2 connects to inductor output; short/wide PCB traces essential for EMI reduction and efficiency. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-input PowerPath™ control | Enables automatic switchover between two independent sources (e.g., primary battery and backup supercapacitor) without external OR-ing FETs or diodes. |
| Seamless buck-boost transition | Maintains regulated VOUT during VIN crossing (e.g., VIN dropping from 12V to 3.3V) with no output glitch or mode-hopping artifacts. |
| Pin-selectable operation modes | SEL pin configures ideal diode or VIN1 priority; MODE pin forces PWM (low-noise) or enables Burst Mode (ultra-low IQ) - no firmware required. |
| Independent, accurate RUN comparators | Two 1.22V ±50mV thresholds with 170mV hysteresis allow distinct UVLO settings per input - critical for asymmetric source management. |
| Integrated gate drivers & charge pumps | Eliminates need for external bootstrap components; CP1/CN1 and CP2/CN2 pins manage floating supplies for high-side N-MOSFETs on both input paths. |
Applications
| Industrial Backup Power | Medical Portable Device |
|---|---|
Use Scenario: PLC controller powered by 24V DC supply with Li-ion battery backup; seamless failover required during AC loss. IC Role / Device Role / Timing Role: Dual-input buck-boost regulator managing primary 24V rail and secondary 3.7V battery, delivering stable 5V/2A to MCU and peripherals. Use Value: Eliminates discrete diode-OR losses (≥0.3V drop), improves backup runtime by >25%, and avoids brownout resets during switchover. | Use Scenario: Handheld ultrasound device with USB-C (5V) and removable 7.4V Li-Po battery; must sustain 3.3V/1.5A sensor rail during hot-swap. IC Role / Device Role / Timing Role: Input-aggregating power manager providing uninterrupted 3.3V output regardless of source combination or voltage level. Use Value: Enables true plug-and-play battery replacement without powering down; 94% peak efficiency extends clinical usage time per charge. |
| Automotive Telematics | IoT Edge Gateway |
Use Scenario: Fleet tracking unit powered by 12V vehicle bus with supercapacitor hold-up for safe shutdown during ignition-off. IC Role / Device Role / Timing Role: Buck-boost converter accepting 9–16V automotive input and 2.7V–5.5V supercapacitor, regulating 5V/1A for GPS and cellular modem. Use Value: Survives cold-crank (≤6V) and load-dump (≤36V) transients via wide VIN range; 2µA shutdown current prevents battery drain. | Use Scenario: Smart meter gateway with primary 5V USB power and secondary 3.6V Li-SOCl₂ battery for long-term data logging during outages. IC Role / Device Role / Timing Role: Dual-source power supervisor ensuring continuous 3.3V operation for ARM Cortex-M4 and LoRa transceiver. Use Value: 50µA Burst Mode IQ extends 10-year battery life; PGD and VxGD signals enable firmware-controlled source diagnostics. |
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 |
|---|---|---|---|
| LTC3115IUFD#TRPBF | Single-input (VIN only), no PowerPath control; 3.5A max output; 4mm × 5mm QFN package. | Cannot arbitrate between two independent sources; requires external diode-OR or ideal diode IC for dual-input use. | Select only if system has one primary input and needs higher current; not suitable for true dual-source redundancy. |
| TPS63070DDCR | Single-input buck-boost; 2.5A max; no dual-VIN arbitration; 6-pin SOT-563 package; lower IQ (20µA Burst Mode). | Lacks RUN1/RUN2, V1GD/V2GD, SEL - cannot implement priority or ideal diode logic without external circuitry. | Choose for cost-sensitive, space-constrained designs where input source diversity is not required. |
Compared with LTC3115IUFD#TRPBF and TPS63070DDCR, the LTC3118IFE#TRPBF uniquely integrates dual-input arbitration, independent UVLO programming, and open-drain status indicators - making it the only solution requiring zero external components to implement robust, self-contained backup power switching.
Availability
LTC3118IFE#TRPBF is available at Aetrix Electronics and suitable for industrial backup power, medical portable devices, automotive telematics, and IoT edge gateways requiring stable component supply across extended temperature ranges.
Supply support for LTC3118IFE#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-performance analog and power management portfolio with rigorous qualification standards.
The LTC3118 belongs to Linear's PowerPath™ buck-boost family, designed specifically for systems demanding seamless, intelligent power source selection between multiple inputs without compromising efficiency or reliability.
FAQ
What is the maximum supported output current for LTC3118IFE#TRPBF at 5V output?
The LTC3118IFE#TRPBF delivers up to 2A continuously at 5V output when VIN exceeds 6V. This is constrained by internal average inductor current limit (3.6A typical), thermal limits of the 28-lead TSSOP package (θJA = 30°C/W), and PCB copper area. Derating is required at elevated ambient temperatures or with poor heatsinking.
How does the SEL pin configure input selection behavior in LTC3118IFE#TRPBF?
When SEL is pulled low, LTC3118IFE#TRPBF operates in VIN1 priority mode: it uses VIN1 if RUN1 and VIN1 meet thresholds; otherwise it falls back to VIN2. When SEL is high, it enters ideal diode mode and automatically selects the higher valid input (VIN1 or VIN2), provided both RUN pins are enabled and their respective inputs exceed UVLO.
Can LTC3118IFE#TRPBF regulate output voltage when input voltage equals the output voltage?
Yes. The LTC3118IFE#TRPBF's proprietary switch algorithm maintains regulation in pass-through mode (VIN ≈ VOUT) without dropout or instability. This is confirmed in the block diagram and typical performance curves showing seamless transitions across buck/boost boundaries - critical for applications like 5V-to-5V backup switchover.
What is the purpose of the CM1 and CM2 pins on LTC3118IFE#TRPBF?
CM1 and CM2 are filter pins for the common-source connections of the VIN1→SW1 and VIN2→SW1 N-channel MOSFETs. Each requires a 47nF capacitor to PGND to suppress high-frequency switching noise on the input paths, improving EMI performance and preventing false triggering of internal comparators - especially critical in high-noise industrial environments.
Does LTC3118IFE#TRPBF support output disconnect during shutdown?
Yes. The LTC3118IFE#TRPBF includes controlled output disconnect in shutdown: when both RUN1 and RUN2 are pulled below 0.2V, internal switches isolate VOUT from VIN1 and VIN2, preventing backfeed and enabling true rail shutdown. This feature is explicitly documented in the Features section and verified in the Absolute Maximum Ratings table.
LTC3118IFE#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:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSSOP-EP
LTC3118IFE#TRPBF FAQ
1.How can I place an order for LTC3118IFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3118IFE#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 LTC3118IFE#TRPBF reliable?
The price and inventory of LTC3118IFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3118IFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3118IFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3118IFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3118IFE#TRPBF?
LTC3118IFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3118IFE#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 LTC3118IFE#TRPBF?
For technical support, including LTC3118IFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3118IFE#TRPBF requirements.
6.How does Aetrix verify that LTC3118IFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3118IFE#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 LTC3118IFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3118IFE#TRPBF?
All LTC3118IFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3118IFE#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 LTC3118IFE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3118IFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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