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Analog Devices Inc. LTC3118EFE#TRPBF
- Part No.:
- LTC3118EFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3118EFE#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 2A 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,693
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Product details
Overview
LTC3118EFE#TRPBF from Analog Devices (formerly Linear Technology) is a dual-input, synchronous buck-boost DC/DC converter with integrated PowerPath™ control. It delivers up to 2A output current across 2V–18V output range, accepts 2.2V–18V inputs on either VIN1 or VIN2, and operates seamlessly in buck, boost, or pass-through modes. It is used in backup power systems where seamless switchover between wall adapter and Li-ion battery is required.
For engineers reviewing the LTC3118EFE#TRPBF datasheet, LTC3118EFE#TRPBF pinout, LTC3118EFE#TRPBF application, or LTC3118EFE#TRPBF equivalent, key selection criteria include dual-input priority/ideal-diode mode behavior, 1.2MHz fixed-frequency PWM vs 50µA Burst Mode quiescent current, programmable RUN thresholds for independent UVLO, and thermal performance in the 28-lead TSSOP package.
Technical Context
The LTC3118EFE#TRPBF employs a current-mode, monolithic buck-boost architecture with four internal N-channel MOSFETs (A1/A2/B/C/D) and two independent charge-pump circuits (CP1/CN1 and CP2/CN2) to drive high-side switches. Its proprietary switch algorithm enables continuous regulation when VIN1 or VIN2 is above, below, or equal to VOUT without subharmonic oscillation or output transients.
Control logic supports SEL-pin-configurable ideal diode mode (selecting higher valid input) or VIN1 priority mode, with independent RUN1/RUN2 comparators (1.22V threshold ±170mV hysteresis) enabling source-specific enable/disable and UVLO programming. VCC is internally regulated to 3.8V (±1%) and sourced from the active input.
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, multi-cell batteries, and industrial rails. |
| Output Voltage Range | 2V to 18V, programmable via FB resistor divider - enables direct generation of 3.3V, 5V, or 12V system rails. |
| Max Output Current | 2A continuous at 5VOUT with VIN > 6V - sufficient for powering microcontrollers, sensors, and communication ICs. |
| Switching Frequency | Fixed 1.2MHz (±167kHz) - minimizes external inductor/capacitor size while maintaining EMI manageability. |
| IQ in Burst Mode | 50µA (active input), 5µA (inactive input) - extends battery life in always-on, low-duty-cycle applications. |
| Shutdown Current | 2µA - ensures negligible drain during system sleep or storage. |
| Efficiency Peak | Up to 94% - reduces thermal load and improves power density in space-constrained designs. |
Pinout & Package
The LTC3118EFE#TRPBF is housed in a 28-lead plastic TSSOP package (JEDEC MO-153) with exposed PGND pad (Pin 29) requiring solder connection to PCB ground plane for thermal and electrical integrity. θJA = 30°C/W, θJC = 5°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SEL (Pin 4) | Input selection mode control | Logic low = VIN1 priority; logic high = ideal diode (auto-select higher valid input); determines power path routing and isolation behavior. |
| RUN1 / RUN2 (Pins 6/7) | Independent enable/UVLO inputs | Each pulls up internally; ≥1.22V enables its input source; resistor dividers program custom UVLO thresholds (e.g., 3.0V cutoff for Li-ion depletion). |
| V1GD / V2GD / PGD (Pins 14/15/16) | Open-drain status indicators | V1GD asserts when VIN1 and RUN1 are valid; V2GD for VIN2/RUN2; PGD asserts when VOUT ≥ 92% of programmed value - enables system-level fault monitoring. |
| CP1/CN1 & CP2/CN2 (Pins 3/2/25/27) | Charge-pump capacitor terminals | Drive gate voltage for high-side N-MOSFETs A1/A2; CN1/CN2 toggle between GND/VCC; CP1/CP2 swing between VINx and VINx+VCC - critical for low-RDS(ON) operation. |
| CM1 / CM2 (Pins 1/28) | Common-mode filter nodes | Connect 47nF capacitors to PGND to suppress switching noise coupling into VIN1/VIN2 paths - improves EMI robustness and input stability. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-input PowerPath™ control | Enables automatic, glitch-free switchover between two independent sources (e.g., main supply and backup battery) without external OR-ing FETs or controllers. |
| Programmable RUN comparator thresholds | Accurate 1.22V ±170mV hysteresis per input allows precise, independent brown-out protection for each power source - avoids premature shutdown during transient dips. |
| Integrated charge-pump gate drives | Eliminates need for external bootstrap diodes/capacitors; supports 100% duty cycle in buck mode and full N-MOSFET utilization for <80mΩ RDS(ON). |
| Burst Mode® with input-aware quiescent current | Draws only 50µA from active input and just 5µA from inactive input - optimizes standby efficiency in dual-source systems where one rail may be idle. |
| Output disconnect in shutdown | Internal switches isolate VOUT from VIN1/VIN2 during shutdown - prevents backfeed and preserves battery charge in portable equipment. |
Applications
| Industrial Backup Power | Portable Medical Device |
|---|---|
Use Scenario: PLC I/O module powered by 24VDC rail with supercapacitor backup during brief AC outages. IC Role / Device Role / Timing Role: Dual-input buck-boost regulator managing seamless transition from 24V main rail to charged supercapacitor (3–12V), maintaining stable 5V/2A for MCU and analog front-end. Use Value: Eliminates need for discrete ideal diode + separate buck-boost IC; achieves >90% efficiency at 500mA load from 6V supercap, extending hold-up time by 3× vs diode-OR. | Use Scenario: Handheld ultrasound probe with dual power options: USB-C PD (5–20V) and removable Li-ion pack (3.0–4.2V). IC Role / Device Role / Timing Role: Single-chip power manager selecting optimal source via SEL pin, regulating 3.3V for FPGA and 5V for transducer driver from either input. Use Value: Enables plug-and-play operation without firmware intervention; 50µA Burst Mode IQ extends battery runtime >12 hours in standby with real-time clock active. |
| Automotive Telematics Gateway | Smart Building Sensor Node |
Use Scenario: LTE gateway in vehicle infotainment system powered by 12V battery (6–16V) and optional CAN bus auxiliary supply. IC Role / Device Role / Timing Role: Buck-boost converter with VIN1 priority (battery) and VIN2 fallback (CAN aux), delivering regulated 5V/1.5A with PGD signaling for host processor health monitoring. Use Value: Survives cold-crank (6V) and load-dump (16V) events; RUN1/RUN2 hysteresis prevents cycling during engine start; 94% peak efficiency reduces thermal stress in sealed enclosure. | Use Scenario: Wireless occupancy sensor node powered by energy-harvested solar cell (2.5–5V) and primary CR2032 coin cell (2.0–3.0V). IC Role / Device Role / Timing Role: Dual-input regulator operating in ideal diode mode to maximize harvested energy, then seamlessly falling back to coin cell when light is insufficient. Use Value: 2.2V minimum input enables operation down to near-dead coin cell; 2µA shutdown current extends 10-year shelf life; CM1/CM2 filtering suppresses switching noise in ultra-low-noise analog signal chain. |
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 (2.7–40V), no PowerPath™, lower 1.5A max output, 24-QFN only | Lacks dual-source management; requires external ideal diode for backup capability | Select only if system has single input and space constraints favor QFN over TSSOP. |
| MAX20406AATJ+ | Single-input (2.5–16V), integrated FETs, 3A output, but no dual-input arbitration or ideal diode mode | No native support for automatic source switchover; needs external controller for backup logic | Prefer when higher current (≥3A) is needed and dual-input functionality is implemented externally. |
Compared with LTC3115IUFD#TRPBF and MAX20406AATJ+, the LTC3118EFE#TRPBF uniquely integrates dual-input arbitration, ideal diode mode, and independent RUN thresholds - eliminating discrete diodes, enable logic, and UVLO circuitry while reducing BOM count by ≥4 components in backup-power designs.
Availability
LTC3118EFE#TRPBF is available at Aetrix Electronics and suitable for industrial backup power, portable medical devices, automotive telematics gateways, and smart building sensor nodes requiring stable component supply across extended temperature ranges.
Supply support for LTC3118EFE#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 full product support, documentation, and manufacturing continuity for all Linear power management ICs.
The LTC3118EFE#TRPBF belongs to Linear's PowerPath™ buck-boost family, designed specifically for systems requiring seamless, efficient power source arbitration between primary and backup supplies in harsh or space-constrained environments.
FAQ
What is the operating temperature range for the LTC3118EFE#TRPBF?
The LTC3118EFE#TRPBF is rated for –40°C to +125°C junction temperature. This E-grade variant uses the 28-lead TSSOP package with exposed PGND pad (Pin 29), and its thermal resistance (θJA = 30°C/W) supports reliable operation in industrial and automotive under-hood applications when properly mounted on a 4-layer PCB with adequate copper pour.
Does the LTC3118EFE#TRPBF support true 100% duty cycle operation?
Yes, the LTC3118EFE#TRPBF supports 100% duty cycle in buck mode (VIN > VOUT) due to its integrated charge-pump gate drivers for high-side N-MOSFETs. The datasheet specifies a maximum duty cycle of 95% for SW2 in boost mode and 88% for SW1 - but in buck configuration, the low-side switch (B) remains continuously on, allowing uninterrupted conduction and minimal dropout voltage.
How does the LTC3118EFE#TRPBF handle input source switchover during load transients?
The LTC3118EFE#TRPBF performs seamless, transient-free switchover between VIN1 and VIN2 using its proprietary switch algorithm and current-mode control. As shown in Typical Application Figure TA01b, the response time is under 100µs with no output voltage dip or overshoot - critical for powering real-time processors and analog sensors without reset or data corruption.
Can the LTC3118EFE#TRPBF generate 3.3V output from a 2.5V input?
No - the LTC3118EFE#TRPBF requires minimum input voltage of 2.2V, but cannot boost 2.5V to 3.3V because its minimum output voltage is 2V and maximum boost ratio is constrained by topology and MOSFET RDS(ON). At 2.5V input, the lowest stable output is ~2.7V (limited by feedback reference tolerance and headroom); for true 2.5V-to-3.3V boost, a dedicated boost converter like the LTC3536 is recommended.
What is the purpose of the CM1 and CM2 pins on the LTC3118EFE#TRPBF?
The CM1 and CM2 pins on the LTC3118EFE#TRPBF serve as common-mode filter nodes for the VIN1-to-SW1 and VIN2-to-SW1 N-MOSFET paths. Connecting a 47nF capacitor from each to PGND attenuates high-frequency switching noise coupled onto the input rails - improving conducted EMI performance and preventing interference with sensitive analog or RF circuits sharing the same power domain.
LTC3118EFE#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
LTC3118EFE#TRPBF FAQ
1.How can I place an order for LTC3118EFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3118EFE#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 LTC3118EFE#TRPBF reliable?
The price and inventory of LTC3118EFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3118EFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3118EFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3118EFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3118EFE#TRPBF?
LTC3118EFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3118EFE#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 LTC3118EFE#TRPBF?
For technical support, including LTC3118EFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3118EFE#TRPBF requirements.
6.How does Aetrix verify that LTC3118EFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3118EFE#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 LTC3118EFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3118EFE#TRPBF?
All LTC3118EFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3118EFE#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 LTC3118EFE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3118EFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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