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Analog Devices Inc. LTC3118IUFD#TRPBF
- Part No.:
- LTC3118IUFD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC3118IUFD#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 2A 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,654
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Product details
Overview
LTC3118IUFD#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 at programmable 2V–18V output from either VIN1 or VIN2 (2.2V–18V), operates seamlessly in buck, boost, or pass-through modes, and achieves up to 94% efficiency-ideal for backup power systems requiring seamless input switchover between wall adapter and Li-ion battery.
For engineers reviewing the LTC3118IUFD#TRPBF datasheet, LTC3118IUFD#TRPBF pinout, LTC3118IUFD#TRPBF application, or LTC3118IUFD#TRPBF equivalent, key selection criteria include dual-input UVLO programmability via RUN1/RUN2, 1.2MHz fixed-frequency PWM/Burst Mode operation, 50µA quiescent current in sleep, and thermal performance in the 4mm × 5mm QFN package with exposed PGND pad.
Technical Context
The LTC3118IUFD#TRPBF employs a current-mode, monolithic buck-boost architecture with independent N-channel MOSFET switch paths (VIN1→SW1 and VIN2→SW1) enabling true input isolation and ideal diode or priority selection logic. Its proprietary switch algorithm ensures transient-free transitions between buck, boost, and pass-through operating regions regardless of relative VIN/VOUT levels.
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 comprehensive protection including short-circuit, thermal overload, reverse inductor current limiting (–200mA), and 6A overload current limit-supporting robust operation across –40°C to 125°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.2V to 18V per input (VIN1 or VIN2); enables flexible sourcing from Li-ion, supercapacitor, or wall adapter without external pre-regulation. |
| Output Voltage Range | 2V to 18V (programmable via FB resistor divider); supports universal 3.3V, 5V, or 12V system rails from variable inputs. |
| Max Output Current | 2A continuous; sufficient for powering microcontrollers, FPGAs, or communication modules in portable industrial equipment. |
| Switching Frequency | Fixed 1.2MHz (±200kHz); minimizes external component size while maintaining high efficiency and low EMI in compact layouts. |
| IQ in Burst Mode | 50µA (active input); extends battery runtime in always-on IoT sensors or remote monitoring devices during light-load standby. |
| Efficiency | Up to 94% at 5V/2A (VIN > 6V); reduces thermal stress and eliminates need for heatsinking in sealed enclosures. |
| Operating Temp Range | –40°C to +125°C (junction); qualified for automotive cabin, industrial PLC, and outdoor telecom applications. |
Pinout & Package
The LTC3118IUFD#TRPBF is housed in a thermally enhanced 24-lead 4mm × 5mm plastic QFN package with exposed PGND pad (Pin 25), requiring soldering to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SEL (Pin 1) | Input selection mode control | Logic low = VIN1 priority; logic high = ideal diode (auto-select higher valid VIN); determines system-level power arbitration behavior. |
| VIN1 (Pin 2) | Primary input voltage source | Lower RDS(ON) path (80mΩ); preferred for highest-efficiency input (e.g., main battery); requires ≥22µF local ceramic decoupling. |
| RUN1 (Pin 3) | VIN1 enable & UVLO threshold programming | Pull >1.22V to enable; resistor divider from VIN1 sets precise turn-on voltage (e.g., 3.0V for Li-ion cutoff). |
| RUN2 (Pin 4) | VIN2 enable & UVLO threshold programming | Independent 1.22V threshold with 170mV hysteresis; enables asymmetric startup sequencing (e.g., backup supply only after main fails). |
| VCC (Pin 5) | Internal LDO output (3.8V) | Supplies gate drivers and internal circuitry; can be back-driven up to 5.5V; bypassed with 4.7µF ceramic capacitor. |
| MODE (Pin 6) | PWM/Burst Mode selection | Logic low = automatic Burst Mode (50µA IQ); logic high = forced PWM (12mA IQ) for low-noise critical loads. |
| GND (Pin 7) | Signal reference ground | Must connect directly to low-impedance ground plane; separate from PGND except at single-point star connection. |
| VC (Pin 8) | Error amplifier output | Connects to RC compensation network; sets voltage loop stability; average current loop is internally compensated. |
| FB (Pin 9) | Feedback input | Monitors VOUT via resistor divider; 1.0V nominal reference enables precise output setting (VOUT = 1.0 × (1 + R1/R2)). |
| V1GD (Pin 10) | VIN1 good indicator | Open-drain output pulled low when VIN1 > UVLO and RUN1 > 1.22V; used for system-level status signaling or fault logging. |
| V2GD (Pin 11) | VIN2 good indicator | Same function as V1GD but for VIN2; allows independent monitoring of dual power sources in redundant systems. |
| PGD (Pin 12) | Power good indicator | Pulls low when VOUT > 92% of programmed value; provides clean enable signal to downstream processors or PMICs. |
| VOUT (Pin 13) | Regulated output | Delivers up to 2A; requires ≥47µF low-ESR ceramic output capacitance placed adjacent to IC for stability and ripple suppression. |
| SW2 (Pin 14) | Boost-side switch node | Connects to inductor output side; high dV/dt node-requires shortest possible PCB trace to minimize EMI and switching losses. |
| BST2 (Pin 15) | Boost gate drive bootstrap | Connects via 0.1µF capacitor to SW2; supplies floating voltage for high-side N-MOSFET (Switch D) driving. |
| BST1 (Pin 16) | Buck-side gate drive bootstrap | Connects via 0.1µF capacitor to SW1; powers high-side switches (A1/A2) for VIN1/VIN2 to SW1 paths. |
| SW1 (Pin 17) | Buck-side switch node | Common switching node for both inputs; connects to inductor input side; shared path enables seamless input switchover. |
| VIN2 (Pin 18) | Secondary input voltage source | Higher RDS(ON) path (120mΩ); designated for backup source where marginal efficiency loss is acceptable. |
| CP2 (Pin 19) | VIN2 charge-pump positive | Toggles between VIN2 and VIN2+VCC during VIN2 operation; drives top N-MOSFET (A2) gate via BST1. |
| CN2 (Pin 20) | VIN2 charge-pump negative | Driven between VCC and GND during VIN2 operation; 10nF capacitor to CP2 forms flying capacitor for A2 gate drive. |
| CM2 (Pin 21) | VIN2 MOSFET common filter | Connects 47nF capacitor to ground; filters noise from VIN2-to-SW1 switching path and improves EMI performance. |
| CM1 (Pin 22) | VIN1 MOSFET common filter | Same function as CM2 but for VIN1 path; critical for reducing cross-talk between dual input channels. |
| CN1 (Pin 23) | VIN1 charge-pump negative | Driven between VCC and GND during VIN1 operation; 10nF capacitor to CP1 forms flying capacitor for A1 gate drive. |
| CP1 (Pin 24) | VIN1 charge-pump positive | Toggles between VIN1 and VIN1+VCC during VIN1 operation; supplies gate drive for lower-loss A1 switch. |
| PGND (Pin 25) | Power ground | Exposed thermal pad; must be soldered to solid copper ground plane for thermal dissipation (θJA = 43°C/W) and low-noise return path. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-input PowerPath™ control | Enables seamless, glitch-free switchover between two independent power sources without external OR-ing FETs or controllers. |
| Programmable input UVLO thresholds | RUN1/RUN2 pins allow independent, resistor-set turn-on voltages (e.g., 2.8V for Li-ion, 4.5V for USB) with built-in hysteresis to prevent chatter. |
| Integrated all-N-channel MOSFETs | Eliminates need for external high-side drivers or discrete FETs; reduces BOM count and layout complexity while optimizing conduction loss. |
| 1.2MHz fixed-frequency PWM + Burst Mode | Ensures predictable EMI profile in PWM mode; automatically drops to ultra-low-IQ Burst Mode below ~100mA load to maximize battery life. |
| Output disconnect in shutdown | Isolates VOUT from inputs during shutdown (RUN1/RUN2 < 0.2V), preventing backfeed and enabling true system-level power gating. |
| Thermal and short-circuit protection | Automatically disables switching under overtemperature (>150°C) or output short conditions, then auto-retries-no external reset required. |
Applications
| Industrial Backup Power | Portable Medical Device |
|---|---|
Use Scenario: Programmable logic controller (PLC) with primary 24VDC rail and secondary 12V supercapacitor bank for ride-through during mains failure. IC Role / Device Role / Timing Role: Dual-input buck-boost regulator providing uninterrupted 5V/2A to CPU and I/O during input switchover; SEL pin configures ideal diode mode. Use Value: Eliminates mechanical relays or discrete diode-OR circuits, reducing failure points and enabling sub-millisecond switchover with no output droop. | Use Scenario: Handheld ultrasound probe powered by removable Li-ion battery (VIN1) and optional USB-C host power (VIN2) during charging. IC Role / Device Role / Timing Role: Primary power management IC regulating stable 3.3V for FPGA and analog front-end; RUN1/RUN2 set asymmetric UVLO to prioritize battery until <3.2V. Use Value: Extends usable battery capacity by 12% vs. standard diode-OR, while enabling hot-swap charging without interrupting device operation. |
| Automotive Infotainment | IoT Edge Gateway |
Use Scenario: In-vehicle infotainment head unit with 12V battery (VIN1) and 5V USB accessory port (VIN2) for firmware updates. IC Role / Device Role / Timing Role: Buck-boost converter generating 5V/2A for SoC and display; MODE pin forces PWM during active update to suppress burst noise in audio subsystem. Use Value: Maintains <10mVpp output ripple during firmware download, preventing audio codec lockup or display artifacts caused by switching noise. | Use Scenario: Cellular-connected environmental sensor node using primary AA batteries (VIN1) and solar harvester output (VIN2) for multi-season operation. IC Role / Device Role / Timing Role: Energy-harvesting power manager delivering regulated 3.3V to MCU and LTE modem; Burst Mode reduces IQ to 50µA during sleep cycles. Use Value: Enables 3-year battery life at 1-minute wake-up interval, doubling runtime versus conventional buck converters with 2mA IQ. |
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 (VIN only), 36V max input, 2.5A max output, no PowerPath™ or dual-VIN control logic. | Lacks input arbitration, ideal diode, or priority mode-requires external circuitry for dual-source systems. | Select only if application uses one input source and requires higher input voltage (up to 36V) or slightly higher current capability. |
| TPS63070DDCR | Single-input buck-boost, 16V max input, 2.4A max output, no programmable RUN thresholds or open-drain GD indicators. | No dual-input support, no independent UVLO programming, and no power-good signaling-unsuitable for redundant power architectures. | Consider only for cost-sensitive, single-rail designs where input switchover and system monitoring are handled externally. |
Compared with LTC3115IUFD#TRPBF and TPS63070DDCR, the LTC3118IUFD#TRPBF uniquely integrates dual-input arbitration, independent UVLO programming, and comprehensive power-status signaling-making it the only drop-in solution for systems requiring autonomous, reliable switchover between two independent power domains without added components.
Availability
LTC3118IUFD#TRPBF is available at Aetrix Electronics and suitable for industrial backup power, portable medical devices, automotive infotainment, and IoT edge gateways requiring stable component supply, extended temperature operation, and seamless dual-input redundancy.
Supply support for LTC3118IUFD#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, acquired Linear Technology in 2017 to strengthen its power management portfolio.
The LTC3118 belongs to ADI's PowerPath™ and high-efficiency buck-boost product line, designed specifically for mission-critical applications demanding autonomous dual-input power management, wide input/output voltage flexibility, and robust protection in harsh environments.
FAQ
What input voltage ranges does the LTC3118IUFD#TRPBF support on VIN1 and VIN2?
The LTC3118IUFD#TRPBF supports 2.2V to 18V on both VIN1 and VIN2 independently. This range accommodates common sources such as single-cell Li-ion (2.7V–4.2V), 12V automotive systems, 5V USB, and 18V wall adapters. Absolute maximum rating is 20V, but continuous operation above 18V is not guaranteed per datasheet specifications.
How does the SEL pin determine which input powers the LTC3118IUFD#TRPBF?
When SEL is pulled low (to GND), the LTC3118IUFD#TRPBF operates in VIN1 priority mode: it uses VIN1 if RUN1 and VIN1 exceed their UVLO thresholds; otherwise it falls back to VIN2. When SEL is pulled high (to VCC), it enters ideal diode mode and automatically selects the higher valid input (VIN1 or VIN2) that meets its respective RUN and UVLO conditions.
Can the LTC3118IUFD#TRPBF generate a 5V output from a 3.3V input?
Yes-the LTC3118IUFD#TRPBF operates in boost mode when input voltage is below the programmed output. With proper inductor (e.g., 3.3µH) and output capacitor selection, it delivers up to 2A at 5V from a 3.3V input while maintaining >90% efficiency, as verified in typical performance graphs (Figure G07).
What is the purpose of the CM1 and CM2 pins on the LTC3118IUFD#TRPBF?
CM1 and CM2 are common-mode filter pins for the VIN1-to-SW1 and VIN2-to-SW1 N-channel MOSFET paths respectively. Each requires a 47nF capacitor to ground to suppress high-frequency switching noise generated by the charge-pump circuits, improving EMI performance and preventing coupling between dual input channels.
Does the LTC3118IUFD#TRPBF provide output disconnect during shutdown?
Yes-the LTC3118IUFD#TRPBF fully disconnects VOUT from both VIN1 and VIN2 when both RUN1 and RUN2 are pulled below 0.2V, entering shutdown with only 2µA quiescent current. This prevents backfeed into disabled inputs and enables true system-level power gating, unlike basic buck-boost converters that maintain conductive paths.
LTC3118IUFD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-WFQFN 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:
- 24-QFN (4x5)
LTC3118IUFD#TRPBF FAQ
1.How can I place an order for LTC3118IUFD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3118IUFD#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 LTC3118IUFD#TRPBF reliable?
The price and inventory of LTC3118IUFD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3118IUFD#TRPBF is usually 5 days.
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We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3118IUFD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3118IUFD#TRPBF?
LTC3118IUFD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3118IUFD#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 LTC3118IUFD#TRPBF?
For technical support, including LTC3118IUFD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3118IUFD#TRPBF requirements.
6.How does Aetrix verify that LTC3118IUFD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3118IUFD#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 LTC3118IUFD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3118IUFD#TRPBF?
All LTC3118IUFD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3118IUFD#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 LTC3118IUFD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3118IUFD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3118IUFD#TRPBF Tags
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