My Inquiry
My Account
Analog Devices Inc. LTC3118IFE#PBF
- Part No.:
- LTC3118IFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3118IFE#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 2A 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,403
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3118IFE#PBF 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 programmable VOUT, accepts 2.2V–18V on either VIN1 or VIN2, and operates seamlessly in buck, boost, or buck-boost modes - enabling single-rail power management for battery + wall adapter systems.
For engineers reviewing the LTC3118IFE#PBF datasheet, LTC3118IFE#PBF pinout, LTC3118IFE#PBF application, or LTC3118IFE#PBF equivalent, key selection criteria include dual-input priority/ideal-diode mode behavior, 1.2MHz fixed-frequency PWM vs 50µA Burst Mode quiescent current, independent RUN1/RUN2 UVLO programming, and thermal performance in the 28-lead TSSOP package.
Technical Context
The LTC3118IFE#PBF implements a current-mode, monolithic buck-boost topology with four internal N-channel MOSFETs (RDS(ON) = 80–120 mΩ), two independent charge-pump circuits (CP1/CN1 and CP2/CN2), and separate gate drivers for VIN1→SW1 and VIN2→SW1 paths. Its proprietary switch algorithm ensures continuous regulation without subharmonic oscillation when input voltage crosses output voltage.
It supports two operational modes via the SEL pin: VIN1 priority (SEL = low) or ideal diode (SEL = high), with automatic switchover based on real-time VIN1/VIN2 comparison and individual RUN pin thresholds. The VC error amplifier enables average inductor current control, while FB sets output voltage via external resistor divider.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.2V to 18V per input (VIN1 or VIN2); supports mixed-source systems like Li-ion + 12V adapter |
| Output Voltage Range | 2V to 18V (programmable via FB resistor divider); enables flexible rail generation including 3.3V, 5V, or 12V outputs |
| Max Output Current | 2A continuous at VOUT = 5V with VIN > 6V; limited by internal 3.6A typical average inductor current threshold |
| Switching Frequency | Fixed 1.2MHz nominal; minimizes external component size while maintaining EMI control in noise-sensitive applications |
| IQ in Burst Mode | 50µA (active input); enables multi-day battery backup operation in low-power states without compromising startup capability |
| Shutdown Current | 2µA (both RUN pins < 0.2V); meets ultra-low standby requirements for always-on industrial or medical devices |
| Efficiency Peak | Up to 94% at mid-load; achieved via low-RDS(ON) MOSFETs and optimized gate drive timing |
Pinout & Package
The LTC3118IFE#PBF is housed in a thermally enhanced 28-lead plastic TSSOP package (JEDEC MO-153) with exposed PGND pad (Pin 29) requiring PCB soldering for thermal and electrical integrity. θJA = 30°C/W, θJC = 5°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SEL (Pin 4) | Input Selection Control | Logic low selects VIN1 priority; logic high enables ideal diode mode (auto-select higher valid input) |
| RUN1 / RUN2 (Pins 6, 7) | Enable & UVLO Threshold Inputs | Each independently programs input-specific turn-on voltage (1.22V typ) with 170mV hysteresis |
| V1GD / V2GD (Pins 14, 15) | Open-Drain Input Good Indicators | Pull low when corresponding VIN + RUN condition is met; used for system-level status monitoring |
| PGD (Pin 16) | Power Good Output | Open-drain signal active when VOUT ≥ 92% of programmed value; provides reliable rail validation |
| VC (Pin 12) | Error Amplifier Output | Controls average inductor current; RC compensation network sets voltage loop stability |
| FB (Pin 13) | Feedback Input | Sets output voltage via resistive divider; 1.0V reference enables precise 2V–18V programming |
| CP1/CN1, CP2/CN2 (Pins 3,2,25,27) | Charge-Pump Terminals | Drive gate voltages for high-side N-MOSFETs; require 10nF ceramic capacitors per pair |
| CM1 / CM2 (Pins 1, 28) | MOSFET Common Node Filters | Connect 47nF capacitors to PGND to suppress switching noise coupling into gate drive paths |
Key Features
| Feature | Design Value |
|---|---|
| Dual-input PowerPath™ architecture | Enables seamless, transient-free switchover between two independent sources without external OR-ing diodes or controllers |
| Independent RUN pin UVLO programming | Allows distinct turn-on thresholds for VIN1 and VIN2 (e.g., 2.7V for Li-ion, 9V for adapter), preventing brownout during source transition |
| Internal all-N-channel MOSFETs | Eliminates need for external high-side drivers or P-channel devices; reduces BOM count and layout complexity |
| Pin-selectable PWM/Burst Mode | MODE pin forces continuous 1.2MHz operation (low noise) or enables auto-switching to 50µA Burst Mode for extended battery life |
| Output disconnect in shutdown | Prevents backfeed from VOUT to inputs during disable; critical for safety-critical or isolated subsystems |
| VIN/VOUT power good indicators | Provides hardware-level fault detection and sequencing signals without software polling or external comparators |
Applications
| Backup Power Systems | Industrial Dual-Supply Routers |
|---|---|
Use Scenario: Maintaining 5V system rail during AC mains failure using supercapacitor or secondary Li-ion as backup source. IC Role / Device Role / Timing Role: Dual-input buck-boost regulator managing primary (12V adapter) and backup (3.6V Li-ion) sources with automatic switchover and no output glitch. Use Value: Eliminates discrete diode-OR losses (≥0.3V drop), extends backup runtime by >30% versus passive solutions, and avoids manual reset after recovery. | Use Scenario: Powering Ethernet switch ASIC and PHYs from either PoE+ (57V) or local 24V DC supply in factory automation gateways. IC Role / Device Role / Timing Role: Primary DC/DC stage converting variable input to stable 3.3V/1.2V rails; handles input transients and hot-swap events. Use Value: Enables redundant power architecture with zero-downtime failover, supports IEEE 802.3bt compliance, and reduces thermal stress on upstream converters. |
| Medical Portable Diagnostics | Automotive Telematics Modules |
Use Scenario: Battery-powered ultrasound handheld running from single-cell Li-ion (2.7–4.2V) while accepting USB-C PD (5–20V) for fast charging and operation. IC Role / Device Role / Timing Role: Single-chip solution providing regulated 5V/3.3V outputs with input source arbitration, load-step response < 50µs, and medical-grade low-noise operation. Use Value: Meets IEC 60601-1 leakage and EMI requirements; eliminates need for separate charger + LDO + supervisor ICs. | Use Scenario: Powering LTE modem, GNSS receiver, and CAN transceiver in vehicle black box using both 12V battery and USB-powered service port. IC Role / Device Role / Timing Role: High-reliability power manager handling cold-crank (4.5V), load-dump (36V), and dual-source redundancy per ISO 16750-2. Use Value: Survives automotive transients without latch-up; maintains GPS lock during engine start via seamless VIN1→VIN2 handoff. |
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 only (no VIN2 path); 3.5A max output; 4mm × 5mm QFN only | Lacks dual-source arbitration; suitable only where one input suffices | Select when cost sensitivity outweighs need for redundancy or backup capability |
| MAX20404ATPA/VY+ | 3.5V–36V input; 5A output; includes I2C interface and telemetry; 20-pin TQFN | Requires firmware integration; adds PMBus monitoring but increases design complexity | Choose for smart power systems needing real-time current/voltage reporting and dynamic configuration |
Compared with LTC3115IUFD#PBF and MAX20404ATPA/VY+, the LTC3118IFE#PBF uniquely delivers pin-configurable dual-input arbitration without microcontroller dependency, making it optimal for analog-intensive, safety-critical, or firmware-constrained designs where deterministic switchover and minimal BOM are essential.
Availability
LTC3118IFE#PBF is available at Aetrix Electronics and suitable for backup power systems, industrial dual-supply routers, medical portable diagnostics, and automotive telematics modules requiring stable component supply across extended temperature ranges (–40°C to 125°C).
Supply support for LTC3118IFE#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 its high-performance power management portfolio with rigorous qualification and long-term product support.
The LTC3118IFE#PBF belongs to Linear's PowerPath™ buck-boost family, engineered specifically for systems demanding seamless dual-input power arbitration, high efficiency across wide voltage ranges, and robust protection in harsh environments.
FAQ
What is the maximum continuous output current capability of the LTC3118IFE#PBF?
The LTC3118IFE#PBF delivers up to 2A continuous output current at 5V output when supplied from VIN > 6V. This is constrained by its internal average inductor current limit (3.6A typical) and thermal limits of the 28-lead TSSOP package. Derating is required at elevated ambient temperatures or higher output voltages due to increased power dissipation in the internal MOSFETs.
How does the SEL pin configure input selection behavior in the LTC3118IFE#PBF?
The SEL pin on the LTC3118IFE#PBF determines input arbitration mode: logic low enables VIN1 priority (VIN1 used if valid; VIN2 only if VIN1 fails), while logic high activates ideal diode mode (automatic selection of higher valid input). Both modes respect individual RUN1/RUN2 enable thresholds and UVLO settings, ensuring deterministic, glitch-free transitions without external logic.
Can the LTC3118IFE#PBF operate with input voltages below the output voltage?
Yes, the LTC3118IFE#PBF operates in true buck-boost topology and regulates VOUT even when either VIN1 or VIN2 is below, above, or equal to the programmed output voltage. Its four-switch architecture and proprietary control algorithm ensure continuous regulation across all three modes without mode-hopping artifacts or output transients - verified in typical application waveforms (Fig. 3118 G32–G34).
What is the purpose of the CM1 and CM2 pins on the LTC3118IFE#PBF?
The CM1 and CM2 pins on the LTC3118IFE#PBF serve as common-mode filter nodes for the VIN1→SW1 and VIN2→SW1 N-channel MOSFET pairs. Each requires a 47nF capacitor to PGND to suppress high-frequency noise coupling into the gate drive paths, directly improving EMI performance and preventing false triggering of the internal drivers - a critical layout requirement specified in the datasheet.
Does the LTC3118IFE#PBF provide output disconnect during shutdown?
Yes, the LTC3118IFE#PBF features controlled output disconnect in shutdown: when both RUN1 and RUN2 are pulled below 0.2V, internal switches isolate VOUT from both VIN1 and VIN2, preventing backfeed and ensuring true zero-current standby. This behavior is confirmed in the functional description and short-circuit recovery waveforms (Fig. 3118 G36–G37), supporting safety-critical and isolated power domain designs.
LTC3118IFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width) 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:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSSOP-EP
LTC3118IFE#PBF FAQ
1.How can I place an order for LTC3118IFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3118IFE#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 LTC3118IFE#PBF reliable?
The price and inventory of LTC3118IFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3118IFE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3118IFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3118IFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3118IFE#PBF?
LTC3118IFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3118IFE#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 LTC3118IFE#PBF?
For technical support, including LTC3118IFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3118IFE#PBF requirements.
6.How does Aetrix verify that LTC3118IFE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3118IFE#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 LTC3118IFE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3118IFE#PBF?
All LTC3118IFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3118IFE#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 LTC3118IFE#PBF part is unused and in its original packaging.
Return procedure for LTC3118IFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3118IFE#PBF 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…
