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Analog Devices Inc. LTC3118MPUFD#PBF
- Part No.:
- LTC3118MPUFD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC3118MPUFD#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 2A 24QFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC3118MPUFD#PBF 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 at fixed 1.2MHz PWM or low-quiescent 50µA Burst Mode - ideal for backup power systems with Li-ion/supercapacitor + wall adapter inputs.
For engineers reviewing the LTC3118MPUFD#PBF datasheet, LTC3118MPUFD#PBF pinout, LTC3118MPUFD#PBF application, or LTC3118MPUFD#PBF equivalent, key selection criteria include its –55°C to 150°C extended temperature rating, dual-input priority/ideal-diode mode logic, 94% peak efficiency, internal N-channel MOSFETs (RDS(ON) as low as 80mΩ), and 24-lead 4mm × 5mm QFN package with exposed PGND pad.
Technical Context
The LTC3118MPUFD#PBF implements a current-mode, monolithic buck-boost topology with independent VIN1-to-SW1 and VIN2-to-SW1 switch paths, enabling true input source isolation and seamless voltage crossover operation. Its proprietary switch algorithm maintains regulation whether VIN1 or VIN2 is above, below, or equal to VOUT - eliminating subharmonic oscillation and output transients during mode transitions.
It integrates five gate drivers (ADRV/BDRV/CDRV/DDRV/PMP), two charge-pump circuits (CP1/CN1 and CP2/CN2), and precision RUN comparators (1.22V threshold ±5%, 170mV hysteresis) for independent UVLO programming on each input. The VC error amplifier supports average-current loop compensation, while FB references 1.0V (±2%) for accurate output regulation across temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | VIN1 or VIN2: 2.2V to 18V - enables direct interface with Li-ion (2.7–4.2V), supercapacitors (0–5.5V), and 12V/18V rails without pre-regulation. |
| Output Voltage Range | 2V to 18V - programmable via FB resistor divider; supports 3.3V, 5V, 12V system rails from diverse inputs. |
| Max Output Current | 2A continuous - verified at 5VOUT with VIN > 6V; limited by internal 3.6A typical average inductor current sense threshold. |
| Switching Frequency | Fixed 1.2MHz (±16.7%) - minimizes external component size (e.g., 3.3µH inductor) while maintaining >90% efficiency at 1A load. |
| Quiescent Current | 50µA in Burst Mode, 2µA in shutdown - extends battery life in always-on backup systems with infrequent load activity. |
| Efficiency | Up to 94% - achieved at mid-load (e.g., 5VOUT/1A from 5VIN or 12VIN); enabled by all-N-channel MOSFETs with RDS(ON) ≤ 80mΩ. |
| Operating Temp Range | –55°C to 150°C - fully tested and guaranteed, supporting aerospace, downhole, and military applications where standard industrial-grade parts fail. |
Pinout & Package
Package: 24-lead (4mm × 5mm) plastic QFN with exposed PGND pad (Pin 25), thermally enhanced for high-power density. Exposed pad must be soldered to PCB ground plane for thermal conduction and low-impedance power return.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SEL (Pin 1) | Input selection logic control | Logic-low = VIN1 priority; logic-high = ideal diode (select higher valid VIN); determines source arbitration behavior at system level. |
| VIN1 (Pin 2) | Primary input supply rail | Lower-RDS(ON) path (80mΩ); preferred for high-efficiency critical sources like main battery; requires ≥22µF local ceramic decoupling. |
| RUN1 (Pin 3) | VIN1 enable & UVLO programming | 1.22V threshold with 170mV hysteresis; resistor-divider programmable to set turn-on voltage above 2.2V for battery monitoring. |
| RUN2 (Pin 4) | VIN2 enable & UVLO programming | Identical function to RUN1; allows independent start-up sequencing for secondary source (e.g., backup capacitor). |
| VCC (Pin 5) | Internal LDO output (3.8V) | Supplies gate drivers and logic; can be back-driven up to 5.5V; bypassed with 4.7µF ceramic capacitor for stability. |
| MODE (Pin 6) | PWM/Burst Mode selection | Logic-low = automatic Burst Mode (50µA IQ); logic-high = forced PWM (12mA IQ) for low-noise, constant-frequency operation. |
| GND (Pin 7) | Signal reference ground | Must connect directly to low-impedance ground plane; separate from PGND but tied at single point to minimize noise coupling. |
| VC (Pin 8) | Error amplifier output | Drives compensation network (RC to GND); sets average inductor current; internal current-loop compensation eliminates external components. |
| FB (Pin 9) | Output voltage feedback | 1.0V reference (±2%); connects to resistor divider from VOUT; enables precise output setting across full 2V–18V range. |
| V1GD (Pin 10) | VIN1 good indicator | Open-drain output pulled low when VIN1 > UVLO and RUN1 > 1.22V - provides system-level status for source health monitoring. |
| V2GD (Pin 11) | VIN2 good indicator | Same function as V1GD for VIN2; enables dual-source fault detection and telemetry in redundant power architectures. |
| PGD (Pin 12) | Power good indicator | Open-drain output pulled low when VOUT > 92% of programmed value - signals regulated output readiness to downstream logic. |
| VOUT (Pin 13) | Regulated output node | Delivers up to 2A; requires ≥47µF low-ESR ceramic output capacitor placed adjacent to IC for transient response and ripple suppression. |
| SW2 (Pin 14) | Boost-side switch node | Connects to inductor output; high dI/dt node - demands short, wide PCB trace to minimize EMI and switching losses. |
| BST2 (Pin 15) | Boost gate drive bootstrap | Connects via 0.1µF capacitor to SW2; supplies floating gate voltage for high-side N-MOSFET (Switch D) in boost configuration. |
| BST1 (Pin 16) | Buck-side gate drive bootstrap | Connects via 0.1µF capacitor to SW1; supplies floating gate voltage for high-side N-MOSFETs (Switches A1/A2) in buck configuration. |
| SW1 (Pin 17) | Buck-side switch node | Common switching node for both inputs; connects to inductor input; high dI/dt node requiring optimized layout for efficiency. |
| VIN2 (Pin 18) | Secondary input supply rail | Higher-RDS(ON) path (120mΩ); intended for less critical sources like backup capacitors; requires ≥22µF local decoupling. |
| CP2 (Pin 19) | VIN2 charge-pump positive | Toggles between VIN2 and VIN2+VCC during VIN2 operation; drives gate of Switch A2; requires 0.1µF BST capacitor. |
| CN2 (Pin 20) | VIN2 charge-pump negative | Driven between VCC and GND during VIN2 operation; monitors VIN2 activity; requires 10nF capacitor to CP2. |
| CM2 (Pin 21) | VIN2 MOSFET common filter | Filters gate-drive noise for VIN2-to-SW1 switches; requires 47nF capacitor to PGND for stable switching. |
| CM1 (Pin 22) | VIN1 MOSFET common filter | Filters gate-drive noise for VIN1-to-SW1 switches; requires 47nF capacitor to PGND - reduces EMI in priority-mode operation. |
| CN1 (Pin 23) | VIN1 charge-pump negative | Driven between VCC and GND during VIN1 operation; monitors VIN1 activity; requires 10nF capacitor to CP1. |
| CP1 (Pin 24) | VIN1 charge-pump positive | Toggles between VIN1 and VIN1+VCC during VIN1 operation; drives gate of Switch A1; requires 0.1µF BST capacitor. |
| PGND (Pin 25) | Power ground / thermal pad | Exposed pad; must be soldered to large PCB copper area for thermal dissipation (θJA = 43°C/W) and low-impedance return path. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-input PowerPath™ control | Enables seamless switchover between primary (VIN1) and backup (VIN2) sources without output dropout - critical for uninterrupted operation in telecom and medical devices. |
| Programmable input priority modes | SEL pin configures either VIN1 priority (for battery-first operation) or ideal diode (for automatic highest-voltage selection), simplifying firmware and reducing BOM count. |
| Integrated all-N-channel MOSFETs | Eliminates external high-side drivers and discrete FETs; reduces solution footprint by >30% versus discrete buck-boost designs while improving efficiency. |
| Accurate independent RUN comparators | 1.22V ±5% thresholds with 170mV hysteresis per input allow precise, temperature-stable battery undervoltage lockout and source sequencing. |
| Thermally robust QFN package | 4mm × 5mm exposed-pad QFN rated for –55°C to 150°C operation; validated for high-reliability applications including avionics and industrial control. |
| Low-noise fixed-frequency PWM | 1.2MHz operation avoids AM radio band; combined with current-mode control, ensures fast transient response (<10µs) and minimal output voltage deviation. |
Applications
| Industrial Backup Power | Military Portable Radios |
|---|---|
Use Scenario: Primary 12V vehicle battery with supercapacitor-based backup during engine cranking. IC Role / Device Role / Timing Role: Dual-input buck-boost regulator maintaining 5V/2A output regardless of input collapse from 12V to <3V. Use Value: Prevents radio reboot during cold-cranking; leverages LTC3118MPUFD#PBF's 2.2V minimum VIN and seamless buck-boost transition. | Use Scenario: Manpack radio powered by Li-ion battery (3.0–4.2V) with 28V aircraft bus as auxiliary input. IC Role / Device Role / Timing Role: Input selector and voltage regulator delivering stable 3.3V to RF front-end and baseband processor. Use Value: Enables dual-source operation without diode-OR losses; LTC3118MPUFD#PBF's –55°C to 150°C rating ensures reliability in desert/arctic environments. |
| Medical Infusion Pumps | Test & Measurement Equipment |
Use Scenario: Battery-powered infusion pump requiring continuous 5V/1A output during AC power loss. IC Role / Device Role / Timing Role: Seamless switchover from wall adapter (5V) to Li-ion (3.6V nominal) with no output glitch or reset. Use Value: Meets IEC 60601-1 safety requirements for uninterrupted operation; LTC3118MPUFD#PBF's 50µA Burst Mode extends battery runtime by 3× vs. PWM-only converters. | Use Scenario: Bench power supply module accepting 5V USB-C, 12V barrel jack, and 19V laptop adapter inputs. IC Role / Device Role / Timing Role: Universal input stage converting variable sources to stable 12V/2A output for analog signal chains. Use Value: Eliminates need for multiple dedicated regulators; LTC3118MPUFD#PBF's 94% peak efficiency minimizes thermal derating in compact enclosures. |
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#PBF | Single-input (2.7V–40V), no dual-source arbitration; 1.1MHz, 1.5A max; lacks SEL/RUN1/RUN2/V1GD/V2GD pins. | Suitable only for single-rail input systems; cannot replace LTC3118MPUFD#PBF in redundancy-critical designs. | Select only if application uses one input source and requires wider 40V input capability. |
| MAX20404ATPA/VY+ | Single-input (2.5V–16V), 3A, 2.2MHz; includes I2C interface and telemetry; no ideal-diode mode or dual RUN pins. | Requires microcontroller coordination for source management; lacks hardware-based autonomous switchover. | Choose when digital control, telemetry, and higher current are prioritized over autonomous dual-input operation. |
Compared with LTC3115IUFD#PBF and MAX20404ATPA/VY+, the LTC3118MPUFD#PBF uniquely delivers hardware-based dual-input arbitration, extended –55°C to 150°C operation, and integrated PowerPath™ control - making it irreplaceable in mission-critical backup power systems where firmware-free redundancy is mandatory.
Availability
LTC3118MPUFD#PBF is available at Aetrix Electronics and suitable for industrial backup power, military portable radios, medical infusion pumps, and test & measurement equipment requiring stable component supply across extreme temperature ranges and long production lifecycles.
Supply support for LTC3118MPUFD#PBF 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, datasheets, and application engineering for legacy Linear parts including the LTC3118 series.
The LTC3118 product line was designed specifically for high-reliability dual-input power management in aerospace, defense, and medical systems - emphasizing autonomous source selection, extended temperature operation, and minimal external component count.
FAQ
What is the operating temperature range of the LTC3118MPUFD#PBF?
The LTC3118MPUFD#PBF is fully tested and guaranteed over –55°C to 150°C junction temperature. This extended range exceeds standard industrial (–40°C to 125°C) and automotive grades, making it suitable for downhole tools, avionics, and military electronics where thermal extremes are routine. Derating curves and thermal impedance data (θJA = 43°C/W) are provided in the official datasheet.
How does the LTC3118MPUFD#PBF handle input switchover between VIN1 and VIN2?
The LTC3118MPUFD#PBF performs hardware-based, glitch-free switchover using the SEL pin: in ideal diode mode (SEL = high), it automatically selects the higher valid input; in priority mode (SEL = low), VIN1 is used unless invalid. Switchover occurs within microseconds without output droop, as confirmed by Figure 3118 TA01b in the datasheet showing 100µs/DIV response with 5VOUT maintained during 5V→12V transition.
Can the LTC3118MPUFD#PBF generate 5V at 2A from a 3.6V Li-ion input?
Yes - the LTC3118MPUFD#PBF operates in boost mode from 3.6V to 5V at up to 2A. Efficiency reaches ~90% at 1A (per Figure 3118 G07), and the internal 3.6A average current limit ensures reliable 2A delivery with appropriate inductor (e.g., 3.3µH) and output capacitance (≥100µF). Thermal performance must be verified per layout guidelines due to boost-mode losses.
What are the key differences between the LTC3118MPUFD#PBF and the commercial-grade LTC3118EUFD#PBF?
The LTC3118MPUFD#PBF differs from the LTC3118EUFD#PBF solely in temperature rating and screening: MP grade is tested and guaranteed from –55°C to 150°C, while E grade is rated –40°C to 125°C. All electrical specifications, pinout, package, and functionality are identical. MP parts undergo additional burn-in and parametric testing for high-reliability applications.
Does the LTC3118MPUFD#PBF require external MOSFETs or drivers?
No - the LTC3118MPUFD#PBF integrates all power switches (five N-channel MOSFETs), gate drivers, charge pumps, and control circuitry. External components are limited to passive elements: input/output capacitors, inductor, feedback resistors, BST capacitors (0.1µF), and CN/CP/CM filter caps. This integration reduces BOM count by >12 parts versus discrete solutions and improves reliability.
LTC3118MPUFD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- Packaging:
- Tube
- 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:
- 24-QFN (4x5)
LTC3118MPUFD#PBF FAQ
1.How can I place an order for LTC3118MPUFD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3118MPUFD#PBF 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 LTC3118MPUFD#PBF reliable?
The price and inventory of LTC3118MPUFD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3118MPUFD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3118MPUFD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3118MPUFD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3118MPUFD#PBF?
LTC3118MPUFD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3118MPUFD#PBF 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 LTC3118MPUFD#PBF?
For technical support, including LTC3118MPUFD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3118MPUFD#PBF requirements.
6.How does Aetrix verify that LTC3118MPUFD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3118MPUFD#PBF 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 LTC3118MPUFD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3118MPUFD#PBF?
All LTC3118MPUFD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3118MPUFD#PBF, 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 LTC3118MPUFD#PBF part is unused and in its original packaging.
Return procedure for LTC3118MPUFD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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