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Analog Devices Inc. LTC3115IFE-2#TRPBF
- Part No.:
- LTC3115IFE-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3115IFE-2#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 20TSSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC3115IFE-2#TRPBF from Analog Devices is a 40V, 2A monolithic synchronous buck-boost DC/DC converter optimized for fast input transients (<1ms), supporting 2.7V–40V input and output ranges, programmable 100kHz–2MHz switching frequency, and AEC-Q100 qualification for automotive use in 24V/28V industrial power systems.
For engineers reviewing the LTC3115IFE-2#TRPBF datasheet, LTC3115IFE-2#TRPBF pinout, LTC3115IFE-2#TRPBF application, or LTC3115IFE-2#TRPBF equivalent, key selection criteria include input transient immunity, wide VIN/VOUT compatibility, Burst Mode® quiescent current (30µA no-load), thermal performance in TSSOP package, and synchronization capability up to 2MHz.
Technical Context
The LTC3115IFE-2#TRPBF implements a proprietary four-switch buck-boost topology with internal N-channel DMOS switches (150mΩ each), enabling seamless mode transitions when VIN is above, below, or equal to VOUT. Its voltage-mode control loop supports both PWM and Burst Mode® operation via the PWM/SYNC pin.
It integrates an internal LDO generating VCC from VIN, programmable input UVLO (2.7V threshold, 100mV hysteresis), and soft-start (9ms). The device features reverse inductor current limiting (−1.5A), overtemperature protection, and short-circuit robustness - all within a thermally enhanced 20-lead TSSOP package rated for −40°C to 125°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 40V - supports lead-acid battery, FireWire, unregulated wall adapters, and 24V/28V industrial rails without external pre-regulation. |
| Output Voltage Range | 2.7V to 40V - enables single-supply generation of 3.3V, 5V, 12V, 24V, or 32V outputs from variable inputs. |
| Max Output Current | 2A in step-down mode (VIN ≥ 6V) - delivers full load at high efficiency without external current-sense resistors. |
| Switching Frequency | 100kHz to 2MHz (programmable via RT resistor) - allows trade-off between size (small inductors at 2MHz) and EMI (lower frequencies for noise-sensitive systems). |
| No-Load Quiescent Current | 30µA in Burst Mode® - extends battery life in always-on automotive telematics or IoT edge nodes. |
| Shutdown Current | 3µA - enables ultra-low-power system-level sleep states with minimal leakage impact. |
| Package | 20-lead plastic TSSOP with exposed PGND pad - provides θJA = 38°C/W for reliable thermal management in compact industrial PCBs. |
Pinout & Package
Package: 20-lead plastic TSSOP (FE), 4mm × 6.5mm × 1.1mm, exposed PGND pad (Pin 21) requiring solder connection to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (Pins 1, 10, 11, 20, Exposed Pad 21) | Power Ground Reference | Mandatory low-impedance connection to PCB ground plane; exposed pad must be soldered for rated thermal performance (θJC = 10°C/W). |
| RUN (Pin 2) | Enable & UVLO Threshold Input | Enables IC when >1.21V; supports custom UVLO via resistor divider; sources 0.5µA hysteresis current after enable. |
| SW2 (Pin 3) | Buck-Boost Power Switch Node | Connects to one end of inductor; drives output during boost phase; requires Schottky clamp for VOUT >20V short-circuit protection. |
| PVOUT (Pin 4) | Power Output Supply Rail | High-current output node; requires ≥10µF low-ESR capacitor placed adjacent to IC with short ground return path. |
| GND (Pins 5, 6) | Signal Ground Reference | Reference for FB, VC, RT, and internal analog circuitry; must be isolated from noisy PGND traces until star-point connection. |
| VC (Pin 7) | Error Amplifier Output | Connects to FB via RC compensation network to stabilize control loop; sensitive to noise coupling from SW pins. |
| FB (Pin 8) | Feedback Voltage Input | Sets regulated output via resistor divider; nominal 1000mV reference; routing must avoid proximity to SW1/SW2 traces. |
| RT (Pin 9) | Oscillator Frequency Programming | Resistor to GND sets switching frequency (e.g., 35.7kΩ → 1MHz); tolerance directly impacts fSW accuracy. |
| VCC (Pin 12) | Internal Control Circuit Supply | Must be tied directly to PVCC; powers bias circuits and logic; bypassed with ≥4.7µF capacitor to PGND. |
| VIN (Pin 13) | VCC Regulator Input & Sense | Supplies internal LDO; also used as input for RUN divider; bypassed with 0.1µF capacitor near IC. |
| PVCC (Pin 14) | VCC Regulator Output & Gate Drive Supply | Outputs regulated ~4.45V rail; supplies gate drivers for all four switches; must connect to VCC. |
| BST2 (Pin 15) | Flying Capacitor for SW2 Gate Drive | Connects via 0.1µF capacitor to SW2; generates boosted voltage for high-side switch D gate drive. |
| BST1 (Pin 16) | Flying Capacitor for SW1 Gate Drive | Connects via 0.1µF capacitor to SW1; generates boosted voltage for high-side switch A gate drive. |
| PVIN (Pin 17) | Main Power Input Rail | High-current input node; requires ≥4.7µF ceramic + optional 47–100µF bulk capacitor for stability under dynamic loads. |
| SW1 (Pin 18) | Buck-Boost Power Switch Node | Connects to other end of inductor; drives input during buck phase; shares same layout sensitivity as SW2. |
| PWM/SYNC (Pin 19) | Mode Control & Clock Sync Input | High = fixed-frequency PWM; low = Burst Mode®; external clock ≤2MHz synchronizes switching with precise timing alignment. |
Key Features
| Feature | Design Value |
|---|---|
| Four-switch synchronous architecture | Eliminates need for external MOSFETs or diodes; achieves up to 95% efficiency across buck/boost/buck-boost regions without mode discontinuities. |
| Proprietary seamless mode transition | Prevents output voltage glitches and subharmonic oscillation during VIN crossing VOUT - critical for automotive start-stop and industrial brownout resilience. |
| Programmable input UVLO with hysteresis | Configurable 2.4V–2.8V falling threshold with 100mV hysteresis ensures clean startup/shutdown in noisy 12V/24V vehicle electrical systems. |
| Integrated VCC LDO with 4.45V regulation | Provides stable gate drive and bias supply independent of input variation; supports 50–110mA load current with <1.2% load regulation. |
| Reverse inductor current limit (−1.5A) | Protects against destructive reverse current during output short-circuit or inductive load dump - essential for automotive and telecom applications. |
Applications
| Automotive Start-Stop Systems | Industrial 24V Power Distribution |
|---|---|
Use Scenario: Maintains stable 5V/12V rail during engine cranking where battery voltage dips to 3.6V for <100ms. IC Role / Device Role / Timing Role: Buck-boost regulator providing uninterrupted power to infotainment, ADAS sensors, and CAN transceivers during cold-crank events. Use Value: Eliminates need for backup capacitors or secondary converters; leverages 2.7V minimum VIN and fast transient response to sustain operation without reset. | Use Scenario: Powers PLC I/O modules and fieldbus interfaces from fluctuating 24V industrial supply with ±20% tolerance. IC Role / Device Role / Timing Role: Primary DC/DC stage converting unregulated 18–32V input to precise 5V/3.3V logic rails with high PSRR and low noise. Use Value: Achieves >90% efficiency at full 2A load across entire input range; reduces thermal stress on PCB and enables fanless enclosure design. |
| FireWire® Power Delivery | Multi-Source Battery Backup Systems |
Use Scenario: Regulates power from IEEE 1394 FireWire port (28–40V) to 5V/12V for portable test equipment or audio interfaces. IC Role / Device Role / Timing Role: Wide-input buck-boost converter handling FireWire's poorly regulated, high-impedance source without instability. Use Value: Uses internal 40V-rated switches and bootstrapped gate drives to operate reliably without external HV FETs or level shifters. | Use Scenario: Seamlessly switches between Li-ion battery (3.0–4.2V), USB-C PD (5–20V), and 12V wall adapter in portable medical devices. IC Role / Device Role / Timing Role: Single-chip solution maintaining constant 3.3V output regardless of source voltage polarity or magnitude relative to VOUT. Use Value: Reduces BOM count by 4+ components vs. discrete buck+boost combo; avoids manual source arbitration logic or sequencing delays. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8390AEDD#PBF | Higher 60V input rating; 3.5A output; requires external MOSFETs; no integrated VCC LDO. | Better suited for 48V telecom or EV auxiliary systems; lacks AEC-Q100 qualification. | Select when input exceeds 40V or >2A continuous output is required; accept added complexity for higher voltage margin. |
| TPS63070DDAR | Lower 16V max input; 2.4A output; fixed 2.5MHz frequency; no UVLO programming or sync input. | Targeted at space-constrained consumer electronics; not qualified for automotive or industrial temp ranges. | Choose for cost-sensitive, non-automotive designs needing small footprint and simple layout; avoid where input transients or extended temp range matter. |
Compared with LT8390A and TPS63070, the LTC3115IFE-2#TRPBF uniquely balances 40V operation, AEC-Q100 compliance, programmable UVLO, and integrated gate drive - making it optimal for automotive and industrial systems demanding reliability across wide input dynamics.
Availability
LTC3115IFE-2#TRPBF is available at Aetrix Electronics and suitable for automotive start-stop systems, industrial 24V power distribution, FireWire® power delivery, and multi-source battery backup systems requiring stable component supply with guaranteed long-term availability.
Supply support for LTC3115IFE-2#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, communications, and automotive markets.
The LTC3115-2 product line was designed specifically for high-reliability power conversion in environments with extreme input voltage variation - targeting automotive, industrial, and telecom applications where seamless buck-boost operation and transient immunity are mandatory.
FAQ
What is the maximum supported switching frequency for the LTC3115IFE-2#TRPBF?
The LTC3115IFE-2#TRPBF supports switching frequencies from 100kHz to 2MHz. This range is set by the RT resistor value or an external clock applied to the PWM/SYNC pin. At 2MHz, the device enables miniaturized designs using small inductors (e.g., 5.2µH), though efficiency and thermal performance must be validated per application conditions. The typical oscillator frequency with RT = 35.7kΩ is 1MHz.
Does the LTC3115IFE-2#TRPBF require external MOSFETs?
No, the LTC3115IFE-2#TRPBF does not require external MOSFETs. It integrates four 150mΩ N-channel DMOS power switches (A–D) and internal high-side gate drivers. Only two external 0.1µF flying capacitors (for BST1 and BST2) and standard passive components (inductor, input/output capacitors, feedback resistors) are needed to complete the buck-boost regulator.
How does the LTC3115IFE-2#TRPBF handle input voltage transients below 2.7V?
The LTC3115IFE-2#TRPBF incorporates programmable input undervoltage lockout (UVLO) with a nominal 2.7V rising threshold and 100mV hysteresis. When VIN falls below the UVLO threshold, the device shuts down cleanly. During fast transients (<1ms), its proprietary control algorithm maintains regulation down to 2.7V - but operation below this voltage is not guaranteed and may trigger shutdown depending on hysteresis and transient depth.
Is the LTC3115IFE-2#TRPBF pin-compatible with the LTC3115EDHD-2#TRPBF?
No, the LTC3115IFE-2#TRPBF (20-lead TSSOP) is not pin-compatible with the LTC3115EDHD-2#TRPBF (16-lead DFN). While both share identical functional pin definitions, their physical layouts differ: the TSSOP has 20 pins with duplicated PGND connections and relocated BST/PVCC pins, whereas the DFN uses a 4mm × 5mm footprint with different pin numbering and thermal pad configuration. PCB redesign is required for substitution.
What thermal considerations apply to the LTC3115IFE-2#TRPBF in continuous 2A operation?
In continuous 2A operation at full load, the LTC3115IFE-2#TRPBF requires proper thermal design: the exposed PGND pad (Pin 21) must be soldered to a minimum 200mm² copper area connected to inner ground planes via ≥6 thermal vias. With θJA = 38°C/W, ambient temperatures above 70°C may exceed the 125°C max junction rating unless airflow or heatsinking is added. Efficiency data shows >90% at 24V→5V/2A, limiting power dissipation to ~1W under those conditions.
LTC3115IFE-2#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width) 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):
- 40V
- Voltage - Output (Min/Fixed):
- 2.7V
- Voltage - Output (Max):
- 40V
- Current - Output:
- 800mA, 2A
- Frequency - Switching:
- 100kHz ~ 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP-EP
LTC3115IFE-2#TRPBF FAQ
1.How can I place an order for LTC3115IFE-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3115IFE-2#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 LTC3115IFE-2#TRPBF reliable?
The price and inventory of LTC3115IFE-2#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3115IFE-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3115IFE-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3115IFE-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3115IFE-2#TRPBF?
LTC3115IFE-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3115IFE-2#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 LTC3115IFE-2#TRPBF?
For technical support, including LTC3115IFE-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3115IFE-2#TRPBF requirements.
6.How does Aetrix verify that LTC3115IFE-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3115IFE-2#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 LTC3115IFE-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3115IFE-2#TRPBF?
All LTC3115IFE-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3115IFE-2#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 LTC3115IFE-2#TRPBF part is unused and in its original packaging.
Return procedure for LTC3115IFE-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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