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Analog Devices Inc. LTC3118HUFD#TRPBF
- Part No.:
- LTC3118HUFD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC3118HUFD#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 2A 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,372
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Product details
Overview
LTC3118HUFD#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), supports seamless buck/boost transitions, operates at 1.2MHz fixed frequency, and features 50µA quiescent current in Burst Mode - ideal for backup power systems with Li-ion/supercapacitor + wall adapter inputs.
For engineers reviewing the LTC3118HUFD#TRPBF datasheet, LTC3118HUFD#TRPBF pinout, LTC3118HUFD#TRPBF application, or LTC3118HUFD#TRPBF equivalent, key selection criteria include dual-input priority/ideal-diode mode behavior, ±1.22V accurate RUN pin thresholds, 94% peak efficiency, thermal grade (–40°C to 150°C), and QFN-24 package compatibility with high-current PCB layout requirements.
Technical Context
The LTC3118HUFD#TRPBF implements a current-mode, monolithic buck-boost topology with independent N-channel MOSFET paths from VIN1 and VIN2 to SW1, enabling true input source isolation and seamless mode transitions without subharmonics or output transients. Its proprietary switch algorithm maintains regulation whether input is above, below, or equal to VOUT.
It integrates a 3.8V internal VCC regulator, dual charge-pump circuits (CP1/CN1 and CP2/CN2) for high-side gate drive, and separate error amplifiers for voltage and average current loops. The 1.2MHz oscillator minimizes external component size while supporting both PWM and Burst Mode operation via the MODE pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | VIN1 or VIN2: 2.2V to 18V - supports wide-range sources including single/dual Li-ion, 12V rail, or 18V adapters. |
| 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 - sufficient for powering microcontrollers, FPGAs, or communication modules with dynamic load profiles. |
| Switching Frequency | Fixed 1.2MHz (±200kHz) - balances small inductor size (e.g., 3.3µH) and EMI performance in space-constrained designs. |
| Quiescent Current | 50µA in Burst Mode, 2µA in shutdown - extends battery life in always-on backup or IoT edge devices. |
| Operating Junction Temp | –40°C to 150°C - qualified for under-hood automotive, industrial control, and high-ambient embedded applications. |
| Peak Efficiency | Up to 94% at 5V/1A (VIN=12V) - reduces thermal stress and improves power density vs. discrete diode-OR solutions. |
Pinout & Package
Package: 24-lead (4mm × 5mm) plastic QFN with exposed PGND pad (Pin 25), thermally enhanced for high-current operation. Requires soldering of exposed pad to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SEL (Pin 1) | Input selection logic control | Logic low = VIN1 priority; logic high = ideal diode mode (selects higher valid VIN); determines system-level power sourcing behavior. |
| VIN1 (Pin 2) | Primary input supply | Lower RDS(ON) path (80mΩ); preferred for high-efficiency critical source (e.g., main battery). |
| RUN1 (Pin 3) | VIN1 enable & UVLO threshold programming | Accurate 1.22V threshold (±50mV) with 170mV hysteresis; resistor divider sets turn-on voltage above 2.2V. |
| RUN2 (Pin 4) | VIN2 enable & UVLO threshold programming | Independent 1.22V threshold with hysteresis; enables asymmetric startup sequencing between inputs. |
| VCC (Pin 5) | Internal LDO output | 3.8V ±0.3V regulated supply for gate drivers; can be back-driven up to 5.5V for auxiliary biasing. |
| MODE (Pin 6) | Operation mode select | Logic low = automatic Burst Mode; logic high = forced PWM - controls light-load efficiency vs. noise trade-off. |
| GND (Pin 7) | Signal reference | Dedicated signal ground; must connect directly to low-impedance ground plane to minimize noise coupling. |
| VC (Pin 8) | Error amplifier output | Compensation node for voltage loop; RC network sets dominant pole and phase margin for stability. |
| FB (Pin 9) | Feedback input | 1.0V reference (±20mV); sets VOUT = 1.0V × (1 + R1/R2); high-impedance input (<50nA leakage). |
| V1GD (Pin 10) | VIN1 good indicator | Open-drain output pulled low when VIN1 > UVLO and RUN1 > 1.22V - enables system-level status monitoring. |
| V2GD (Pin 11) | VIN2 good indicator | Open-drain output pulled low when VIN2 > UVLO and RUN2 > 1.22V - supports dual-source health diagnostics. |
| PGD (Pin 12) | Power good indicator | Open-drain output pulled low when VOUT < 92% of programmed value - provides reliable power sequencing signal. |
| VOUT (Pin 13) | Regulated output | Delivers up to 2A; requires ≥47µF low-ESR ceramic capacitor placed adjacent to IC for ripple suppression. |
| SW2 (Pin 14) | Boost-side switch node | Connects to inductor output side; high dv/dt node - demands short, wide PCB trace to minimize EMI and switching losses. |
| BST2 (Pin 15) | SW2 high-side gate drive bootstrap | Connects via 0.1µF capacitor to SW2; supplies floating gate voltage for N-channel MOSFET D (SW2→VOUT path). |
| BST1 (Pin 16) | VIN1/VIN2 high-side gate drive bootstrap | Connects via 0.1µF capacitor to SW1; powers gate drive for A1 (VIN1→SW1) or A2 (VIN2→SW1) switches. |
| SW1 (Pin 17) | Buck-side switch node | Common connection point for VIN1 and VIN2 paths; connects to inductor input side - critical high-current node. |
| VIN2 (Pin 18) | Secondary input supply | Higher RDS(ON) path (120mΩ); suitable for auxiliary source (e.g., backup supercapacitor or adapter). |
| CP2 (Pin 19) | VIN2 charge-pump positive | Toggles between VIN2 and VIN2+VCC during VIN2 operation; drives gate of A2 switch. |
| CN2 (Pin 20) | VIN2 charge-pump negative | Driven between GND and VCC during VIN2 operation; 10nF cap to CP2 forms flying capacitor for A2 gate drive. |
| CM2 (Pin 21) | VIN2 MOSFET common filter | Connects 47nF capacitor to ground; filters switching noise on VIN2-to-SW1 path. |
| CM1 (Pin 22) | VIN1 MOSFET common filter | Connects 47nF capacitor to ground; filters switching noise on VIN1-to-SW1 path. |
| CN1 (Pin 23) | VIN1 charge-pump negative | Driven between GND and VCC during VIN1 operation; 10nF cap 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; drives gate of A1 switch. |
| PGND (Pin 25) | Power ground | Exposed thermal pad; must be soldered to PCB ground plane - serves as primary return for high-current paths and thermal dissipation path. |
Key Features
| Feature | Design Value |
|---|---|
| Intelligent dual-input PowerPath™ | Enables automatic switchover between two independent sources (e.g., battery + adapter) with no external OR-ing FETs or controllers. |
| Seamless buck-boost transition | Maintains regulated VOUT across input voltages both above and below output - eliminates output glitches during VIN crossing. |
| Accurate, independent RUN comparators | 1.22V ±50mV thresholds with 170mV hysteresis per input - allows precise, asymmetric brown-in/brown-out sequencing for each source. |
| Integrated charge-pump gate drives | Eliminates need for external bootstrap diodes/caps; supports 100% duty cycle in boost mode and robust high-side N-FET control. |
| Thermally rugged QFN package | θJA = 43°C/W, θJC = 3.4°C/W - enables 2A operation at 150°C junction temperature with standard 4-layer PCB layout. |
| Output disconnect in shutdown | Internal switches isolate VOUT from inputs during shutdown - prevents backfeed and ensures true zero-load current draw. |
Applications
| Industrial Backup Power | Automotive Telematics |
|---|---|
Use Scenario: Industrial PLC with primary 24V rail and supercapacitor-based backup during mains failure. IC Role / Device Role / Timing Role: Dual-input buck-boost controller managing seamless transition from 24V supply to 5V supercap backup, maintaining 5V/2A for CPU and I/O during outage. Use Value: Eliminates discrete diode-OR and external supervisor ICs; achieves <2µA shutdown current and 150°C operation for extended field reliability. | Use Scenario: Automotive infotainment head unit powered by 12V battery and USB-C PD adapter. IC Role / Device Role / Timing Role: Priority-mode power manager selecting battery (VIN1) by default, switching to USB-C (VIN2) only when ignition is off and adapter is present. Use Value: Enables "always-on" connectivity with <50µA Burst Mode quiescent current; accurate RUN thresholds prevent false turn-on during cranking dips. |
| Medical Portable Monitor | Test & Measurement Equipment |
Use Scenario: Battery-powered patient monitor with hot-swap capability for AC adapter during operation. IC Role / Device Role / Timing Role: Ideal diode-mode converter sourcing 3.3V/2A from higher-voltage source (Li-ion or adapter), with automatic switchover and PGD signaling. Use Value: Provides glitch-free power continuity during source swap; V1GD/V2GD signals enable firmware to log source status and remaining capacity. | Use Scenario: Bench power supply module requiring stable 5V/2A output from variable lab inputs (5V, 12V, or 18V). IC Role / Device Role / Timing Role: Programmable buck-boost regulator accepting any input in 2.2–18V range and delivering precise 5V output with <1% line/load regulation. Use Value: Reduces BOM count vs. multiple fixed-input converters; 1.2MHz operation enables compact 3.3µH inductor and low-profile design. |
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 VIN2 path or SEL logic; 1.1MHz, 1.5A max; lacks V1GD/V2GD indicators. | Suitable only for single-source systems; cannot replace dual-input functionality or ideal diode mode. | Select only if application uses one input and requires lower cost or smaller footprint - not a functional substitute for LTC3118HUFD#TRPBF. |
| MAX20404ATPA/VY+ | Single-input (2.5–16V), 3A, 2.2MHz; includes I²C interface and telemetry; no dual-input arbitration or PowerPath™ logic. | Requires microcontroller coordination for multi-rail systems; adds software complexity vs. autonomous LTC3118 decision logic. | Choose when digital control, telemetry, or higher current is needed - but expect redesign for input management and sequencing logic. |
Compared with LTC3115IUFD#TRPBF and MAX20404ATPA/VY+, the LTC3118HUFD#TRPBF uniquely integrates autonomous dual-input selection, ideal diode arbitration, and dedicated status indicators - eliminating external logic and reducing system-level validation effort for backup and redundancy-critical applications.
Availability
LTC3118HUFD#TRPBF is available at Aetrix Electronics and suitable for industrial backup power, automotive telematics, medical portable monitors, and test & measurement equipment requiring stable component supply across extended temperature ranges.
Supply support for LTC3118HUFD#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. Linear Technology was renowned for precision DC/DC converters and power system design expertise.
The LTC3118 product line was designed specifically for high-reliability dual-input power systems requiring seamless switchover, wide input/output voltage flexibility, and robust thermal performance in harsh environments.
FAQ
What is the maximum junction temperature rating for the LTC3118HUFD#TRPBF?
The LTC3118HUFD#TRPBF is rated for operation up to 150°C junction temperature, with guaranteed specifications over –40°C to 150°C. This H-grade qualification makes it suitable for under-hood automotive, industrial control cabinets, and other high-ambient applications where thermal derating is critical. The exposed PGND pad must be soldered to a thermal pad on the PCB to achieve specified θJA = 43°C/W.
How does the SEL pin determine input selection in the LTC3118HUFD#TRPBF?
The SEL pin configures the LTC3118HUFD#TRPBF into either VIN1 priority mode (SEL = low) or ideal diode mode (SEL = high). In priority mode, VIN1 powers VOUT unless disabled by UVLO or RUN1; in ideal diode mode, the higher valid input (VIN1 or VIN2) automatically supplies VOUT. Both modes require respective RUN pins to exceed 1.22V and inputs to be above 2.2V.
Can the LTC3118HUFD#TRPBF generate 5V output from a 3.6V Li-ion battery?
Yes, the LTC3118HUFD#TRPBF supports boost operation down to 2.2V input, so it can generate a regulated 5V output from a single-cell Li-ion battery (3.0–4.2V range). At 3.6V input and 5V/1A output, typical efficiency exceeds 88% in PWM mode. The device maintains regulation even as the battery discharges below VOUT, leveraging its seamless buck-boost architecture.
What is the purpose of the CM1 and CM2 pins on the LTC3118HUFD#TRPBF?
The CM1 and CM2 pins on the LTC3118HUFD#TRPBF serve as common-mode filter nodes 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 gate drive circuits, improving EMI performance and preventing coupling into sensitive analog sections of the system.
Does the LTC3118HUFD#TRPBF support output disconnect during shutdown?
Yes, the LTC3118HUFD#TRPBF provides true output disconnect in shutdown mode: when both RUN1 and RUN2 are pulled below 0.2V, all internal power switches open, isolating VOUT from both VIN1 and VIN2. This prevents backfeed, eliminates leakage paths, and ensures <2µA total shutdown current - essential for battery-powered systems requiring zero standby drain.
LTC3118HUFD#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (4x5)
LTC3118HUFD#TRPBF FAQ
1.How can I place an order for LTC3118HUFD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3118HUFD#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 LTC3118HUFD#TRPBF reliable?
The price and inventory of LTC3118HUFD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3118HUFD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3118HUFD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3118HUFD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3118HUFD#TRPBF?
LTC3118HUFD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3118HUFD#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 LTC3118HUFD#TRPBF?
For technical support, including LTC3118HUFD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3118HUFD#TRPBF requirements.
6.How does Aetrix verify that LTC3118HUFD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3118HUFD#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 LTC3118HUFD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3118HUFD#TRPBF?
All LTC3118HUFD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3118HUFD#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 LTC3118HUFD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3118HUFD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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