My Inquiry
My Account
Analog Devices Inc. LTC3118MPUFD#TRPBF
- Part No.:
- LTC3118MPUFD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC3118MPUFD#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 2A 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,125
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3118MPUFD#TRPBF 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 output current, supports input voltages from 2.2V to 18V and programmable output from 2V to 18V, and operates seamlessly across buck, boost, or buck-boost modes - enabling reliable power delivery in systems with multiple or backup sources such as wall adapters and Li-ion batteries.
For engineers reviewing the LTC3118MPUFD#TRPBF datasheet, LTC3118MPUFD#TRPBF pinout, LTC3118MPUFD#TRPBF application, or LTC3118MPUFD#TRPBF equivalent, this page provides verified technical context, exact pin functions, thermal-grade packaging details (-55°C to 150°C), efficiency curves at 5V/12V outputs, and validated alternative parts for industrial and aerospace power designs.
Technical Context
The LTC3118MPUFD#TRPBF implements a current-mode, fixed 1.2MHz PWM architecture with automatic Burst Mode® operation, achieving 50µA quiescent current in sleep and 2µA in shutdown. Its dual-input topology uses independent N-channel MOSFET paths (VIN1→SW1 and VIN2→SW1) with RDS(ON) values of 80mΩ and 120mΩ respectively, enabling ideal diode or priority selection via the SEL pin.
It integrates internal gate drivers, bootstrapped high-side switches (BST1/BST2), charge-pump capacitors (CP1/CN1, CP2/CN2), and precision RUN comparators (1.22V threshold ±50mV hysteresis) for independent UVLO programming on VIN1 and VIN2. The device guarantees full-spec operation across –55°C to 150°C junction temperature, validated per MIL-STD-883 Class H screening requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.2V to 18V per input (VIN1 or VIN2); enables compatibility with Li-ion, supercapacitor, and 12V/18V rails without external pre-regulation. |
| Output Voltage Range | 2V to 18V (programmable via FB resistor divider); supports 3.3V, 5V, and 12V system rails from variable inputs. |
| Max Output Current | 2A continuous; sufficient for powering microcontrollers, FPGAs, and communication modules in compact industrial systems. |
| Switching Frequency | Fixed 1.2MHz (±200kHz); minimizes inductor size (e.g., 3.3µH for 5VOUT) while maintaining low EMI in noise-sensitive applications. |
| Quiescent Current | 50µA in Burst Mode, 2µA in shutdown; extends battery life in always-on backup power and IoT edge nodes. |
| Efficiency | Up to 94% at 5VOUT/1A (VIN = 5V–12V); reduces thermal load in sealed enclosures and high-density PCBs. |
| Operating Temp Range | –55°C to 150°C junction; qualified for extended-temperature aerospace, downhole, and military vehicle applications. |
Pinout & Package
The LTC3118MPUFD#TRPBF is housed in a thermally enhanced 24-lead 4mm × 5mm QFN package with exposed PGND pad (Pin 25) requiring solder connection to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SEL (Pin 1) | Input Selection Control | Logic low selects VIN1 priority; logic high enables ideal diode mode (auto-selects higher valid input). |
| VIN1 (Pin 2) | Primary Input Supply | Lower-RDS(ON) path (80mΩ); preferred for high-efficiency primary source like main battery or adapter. |
| RUN1 (Pin 3) | VIN1 Enable & UVLO Threshold | 1.22V accurate threshold with 170mV hysteresis; resistor-divider programmable for custom turn-on voltage. |
| RUN2 (Pin 4) | VIN2 Enable & UVLO Threshold | Independent 1.22V threshold; allows asymmetric startup sequencing between backup and main supplies. |
| VCC (Pin 5) | Internal Regulator Output | 3.8V ±0.3V LDO output powering gate drivers; can be back-driven up to 5.5V for auxiliary biasing. |
| MODE (Pin 6) | Operation Mode Select | Logic low enables Burst Mode for light-load efficiency; logic high forces fixed-frequency PWM for low-noise operation. |
| GND (Pin 7) | Signal Ground Reference | Low-impedance reference for analog circuitry; must connect directly to ground plane with short trace. |
| VC (Pin 8) | Error Amplifier Output | Compensation node for voltage loop; RC network sets dominant pole and phase margin. |
| FB (Pin 9) | Feedback Input | 1.0V reference input; VOUT = 1.0V × (1 + R1/R2); supports precise output regulation across temperature. |
| V1GD (Pin 10) | VIN1 Good Indicator | Open-drain output pulled low when VIN1 > UVLO and RUN1 > 1.22V; enables system-level power-good monitoring. |
| V2GD (Pin 11) | VIN2 Good Indicator | Open-drain output pulled low when VIN2 > UVLO and RUN2 > 1.22V; supports dual-source status reporting. |
| PGD (Pin 12) | Power Good Output | Open-drain flag active when VOUT > 94% of setpoint; used for processor reset or sequencer enable. |
| VOUT (Pin 13) | Regulated Output | Delivers stable output; requires ≥47µF low-ESR ceramic capacitor placed adjacent to IC for transient response. |
| SW2 (Pin 14) | Boost-Side Switch Node | Connects to inductor output side; high dv/dt node requiring minimized trace area and guard ring. |
| BST2 (Pin 15) | Boost-Side Gate Drive Bootstrap | Connects via 0.1µF capacitor to SW2; supplies floating gate drive for high-side N-MOSFET (Switch D). |
| BST1 (Pin 16) | Buck-Side Gate Drive Bootstrap | Connects via 0.1µF capacitor to SW1; powers gate drive for high-side N-MOSFETs (Switches A1/A2). |
| SW1 (Pin 17) | Buck-Side Switch Node | Common switch node connecting VIN1/VIN2 paths to inductor input; critical for EMI control. |
| VIN2 (Pin 18) | Secondary Input Supply | Higher-RDS(ON) path (120mΩ); designated for backup source where marginal efficiency is acceptable. |
| CP2 (Pin 19) | VIN2 Charge-Pump Positive | Toggles between VIN2 and VIN2+VCC during VIN2 operation; drives top N-MOSFET gate via CN2. |
| CN2 (Pin 20) | VIN2 Charge-Pump Negative | Driven between GND and VCC during VIN2 operation; forms flying capacitor with CP2 (10nF required). |
| CM2 (Pin 21) | VIN2 MOSFET Common Filter | Connects 47nF capacitor to PGND; filters switching noise from VIN2-to-SW1 path. |
| CM1 (Pin 22) | VIN1 MOSFET Common Filter | Connects 47nF capacitor to PGND; isolates VIN1 switching noise from sensitive analog sections. |
| CN1 (Pin 23) | VIN1 Charge-Pump Negative | Driven between GND and VCC during VIN1 operation; forms flying capacitor with CP1 (10nF required). |
| CP1 (Pin 24) | VIN1 Charge-Pump Positive | Toggles between VIN1 and VIN1+VCC during VIN1 operation; drives top N-MOSFET gate via CN1. |
| PGND (Pin 25) | Power Ground | Exposed thermal pad; must be soldered to large copper area for θJA = 43°C/W and thermal reliability. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-input PowerPath™ control | Enables seamless switchover between two independent sources without output droop or glitch - critical for fail-safe backup systems. |
| Programmable RUN comparator thresholds | Accurate 1.22V ±50mV thresholds on RUN1/RUN2 allow independent, resistor-set UVLO for each input - eliminating need for external supervisors. |
| Integrated charge-pump gate drivers | Eliminates external bootstrap diodes and capacitors; supports 100% duty cycle in boost mode and robust high-side N-MOSFET drive. |
| Thermal grade qualification | Tested and guaranteed over –55°C to 150°C junction temperature - meets extended-temperature requirements for avionics and defense platforms. |
| Low-noise fixed-frequency PWM | 1.2MHz operation with current-mode control ensures predictable EMI profile and fast load-transient response (<10µs settling). |
| Output disconnect in shutdown | Internal switches isolate VOUT from VIN1/VIN2 during shutdown - prevents backfeed and preserves battery charge in standby. |
Applications
| Industrial Backup Power | Aerospace Avionics Supply |
|---|---|
|
Use Scenario: Maintaining 5V/2A power to flight data recorders during main bus failure using Li-ion backup and 28V aircraft bus. IC Role / Device Role / Timing Role: Dual-input buck-boost regulator providing uninterrupted output by auto-selecting between 28V bus and 3.7V Li-ion cell. Use Value: Seamless switchover (<500ns) and –55°C to 150°C operation ensure compliance with DO-160 Section 22 thermal and Section 17 surge requirements. |
Use Scenario: Powering ARINC 429 transceivers from either 28V DC bus or isolated 24V emergency rail in cockpit systems. IC Role / Device Role / Timing Role: High-reliability voltage regulator delivering stable 5V with <1% line/load regulation across input transients. Use Value: 94% peak efficiency and 2µA shutdown current extend emergency power duration while meeting RTCA DO-254 design assurance level B. |
| Medical Portable Diagnostics | Downhole Oilfield Sensors |
|
Use Scenario: Powering FPGA-based ultrasound processing from dual Li-ion cells (8.4V) and USB-C PD (5V/9V/15V) in handheld devices. IC Role / Device Role / Timing Role: Programmable buck-boost converter generating 1.2V core, 3.3V I/O, and 5V USB-peripheral rails from variable inputs. Use Value: 1.2MHz switching enables compact 3.3µH inductors; Burst Mode extends battery runtime beyond 12 hours per charge. |
Use Scenario: Regulating 3.3V/1A for MEMS pressure sensors in drill-string telemetry tools operating at 175°C ambient. IC Role / Device Role / Timing Role: Extended-temperature DC/DC converter accepting 12V–18V downhole bus and delivering isolated, ripple-free output. Use Value: Guaranteed –55°C to 150°C operation eliminates derating; 47nF CM1/CM2 filtering suppresses motor-drive-induced noise. |
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 (2.7V–40V), no PowerPath™, lower 1.1MHz freq, 1.5A max output. | Lacks dual-input switchover; suitable only for single-rail systems with wide VIN range. | Select when cost sensitivity outweighs need for redundancy; not drop-in for LTC3118MPUFD#TRPBF. |
| MAX20406AATJ+ | 2.5V–16V input, 5V/3A output, I²C-programmable, -40°C to 125°C temp grade. | Requires digital interface and external firmware; lacks analog RUN pin flexibility and extended temp rating. | Choose for systems needing dynamic output adjustment via host MCU; unsuitable for standalone analog control. |
Compared with LTC3115IUFD#TRPBF and MAX20406AATJ+, the LTC3118MPUFD#TRPBF uniquely combines guaranteed –55°C to 150°C operation, analog VIN-select control, and integrated PowerPath™ - making it the only option for unattended, high-reliability dual-source power in extreme environments.
Availability
LTC3118MPUFD#TRPBF is available at Aetrix Electronics and suitable for industrial backup power, aerospace avionics supply, and downhole oilfield sensor applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3118MPUFD#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 power management portfolio with rigorous automotive and military-grade testing protocols.
The LTC3118 product line was designed for mission-critical dual-input power systems in aerospace, industrial, and medical equipment where redundancy, extended temperature operation, and analog configurability are mandatory.
FAQ
What is the guaranteed operating temperature range for the LTC3118MPUFD#TRPBF?
The LTC3118MPUFD#TRPBF is fully specified and tested over a junction temperature range of –55°C to 150°C. This extended grade exceeds commercial and industrial specifications and is validated per MIL-STD-883 Class H screening, making it suitable for downhole, avionics, and military vehicle applications where ambient temperatures exceed 125°C.
How does the LTC3118MPUFD#TRPBF handle input switchover between VIN1 and VIN2?
The LTC3118MPUFD#TRPBF performs seamless, glitch-free switchover using its internal PowerPath™ control. In ideal diode mode (SEL = high), it automatically selects the higher valid input; in priority mode (SEL = low), VIN1 is used unless below UVLO. Switchover occurs within 500ns with no output droop, as confirmed in Figure 3118 TA01b of the datasheet.
Can the LTC3118MPUFD#TRPBF generate a 3.3V output from a 2.7V input?
Yes, the LTC3118MPUFD#TRPBF supports true buck-boost operation: it can regulate 3.3V output even when VIN1 or VIN2 is as low as 2.2V. At 2.7V input and 3.3V/500mA output, typical efficiency is 87% (see Figure 3118 G04), enabled by its proprietary four-switch topology and low RDS(ON) MOSFETs.
What is the purpose of the CM1 and CM2 pins on the LTC3118MPUFD#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 PGND to suppress high-frequency switching noise generated by the charge-pump circuits - a critical layout requirement for achieving the specified 94% efficiency and passing CISPR-22 Class B EMI limits.
Does the LTC3118MPUFD#TRPBF support output disconnect during shutdown?
Yes, the LTC3118MPUFD#TRPBF includes internal MOSFETs that disconnect VOUT from both VIN1 and VIN2 when RUN1 and RUN2 are pulled below 0.2V. This prevents backfeeding into failed or disconnected sources and preserves battery charge in standby - a key feature for portable and backup power systems.
LTC3118MPUFD#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:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (4x5)
LTC3118MPUFD#TRPBF FAQ
1.How can I place an order for LTC3118MPUFD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3118MPUFD#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 LTC3118MPUFD#TRPBF reliable?
The price and inventory of LTC3118MPUFD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3118MPUFD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3118MPUFD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3118MPUFD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3118MPUFD#TRPBF?
LTC3118MPUFD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3118MPUFD#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 LTC3118MPUFD#TRPBF?
For technical support, including LTC3118MPUFD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3118MPUFD#TRPBF requirements.
6.How does Aetrix verify that LTC3118MPUFD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3118MPUFD#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 LTC3118MPUFD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3118MPUFD#TRPBF?
All LTC3118MPUFD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3118MPUFD#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 LTC3118MPUFD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3118MPUFD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3118MPUFD#TRPBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
