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Analog Devices Inc. LTC3115IFE-1#PBF
- Part No.:
- LTC3115IFE-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3115IFE-1#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,037
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Product details
Overview
LTC3115IFE-1#PBF from Analog Devices is a 40V, 2A monolithic synchronous buck-boost DC/DC converter with 2.7V–40V input and output voltage ranges, programmable 100kHz–2MHz switching frequency, and Burst Mode® operation enabling 50µA no-load quiescent current - deployed in automotive power systems requiring seamless VIN-to-VOUT transitions across wide input rails.
For engineers reviewing the LTC3115IFE-1#PBF datasheet, LTC3115IFE-1#PBF pinout, LTC3115IFE-1#PBF application, or LTC3115IFE-1#PBF equivalent, key selection criteria include verified 2A step-down capability at VIN ≥ 6V, AEC-Q100 qualification for automotive use, thermal performance in 20-lead TSSOP (θJA = 38°C/W), and confirmed compatibility with external clock synchronization up to 2MHz.
Technical Context
The LTC3115IFE-1#PBF implements a four-switch synchronous buck-boost topology with internal N-channel DMOS switches (150mΩ each), proprietary voltage-mode control, and seamless mode transitions - eliminating subharmonic oscillation and output transients when VIN crosses VOUT. Its dual gate-drive architecture uses BST1/BST2 flying capacitors to sustain high-side switch operation across the full 2.7V–40V range.
It integrates a precision 1000mV feedback reference (±23mV tolerance), programmable input UVLO with 100mV hysteresis, and internal soft-start (9ms typical). The RUN pin enables both logic-controlled enable/disable and resistor-divider–set UVLO thresholds, while PWM/SYNC supports pin-selectable Burst Mode®, fixed-frequency PWM, or external clock synchronization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 40V - supports lead-acid battery (12V/24V), FireWire, and unregulated industrial rails without pre-regulation. |
| Output Voltage Range | 2.7V to 40V - enables single-rail generation for mixed-voltage systems (e.g., 3.3V, 5V, 12V, 24V) from variable inputs. |
| Max Output Current | 2A in step-down mode (VIN ≥ 6V) - delivers full rated load without derating when input exceeds output voltage. |
| Switching Frequency | 100kHz to 2MHz - selectable via RT resistor; enables compact magnetics (e.g., 5.2µH at 2MHz) and EMI optimization. |
| No-Load Quiescent Current | 50µA in Burst Mode® - extends battery runtime in always-on automotive telematics and sensor nodes. |
| Shutdown Current | 3µA - ensures negligible drain during vehicle sleep modes per ISO 16750-2 requirements. |
| Feedback Reference | 1000mV ±23mV - enables accurate output regulation with standard resistor dividers; line/load regulation <0.5%. |
Pinout & Package
Package: 20-lead plastic TSSOP (FE), 4mm × 6.5mm × 1.1mm, exposed pad (Pin 21) connected to PGND for thermal and electrical integrity. θJA = 38°C/W, TJMAX = 125°C (I-grade).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (Pins 1, 10, 11, 20, Exposed Pad 21) | Power Ground Return | Low-impedance path for switch currents; exposed pad must be soldered to PCB ground plane for thermal performance. |
| RUN (Pin 2) | Enable / UVLO Threshold Input | Logic-enable input (1.21V threshold) and analog node for resistor-divider–set undervoltage lockout with 100mV hysteresis. |
| SW2 (Pin 3) | Buck-Boost Power Switch Node | Connects to one end of inductor; drives output-side switch (D) in 4-switch topology; requires low-inductance layout. |
| PVOUT (Pin 4) | Power Output Supply Rail | High-current output connection; requires ≥10µF low-ESR ceramic capacitor placed adjacent to IC with short ground return. |
| GND (Pins 5, 6) | Signal Ground Reference | Reference for FB, VC, RT, and internal error amplifier; must be isolated from PGND until star-point connection. |
| VC (Pin 7) | Error Amplifier Output | Compensation node for loop stability; connects to FB via RC network to set crossover and phase margin. |
| FB (Pin 8) | Output Voltage Feedback Input | Senses resistive divider output; 1000mV reference enables precise VOUT setting; sensitive to noise coupling from SW pins. |
| RT (Pin 9) | Oscillator Frequency Programming | Resistor-to-ground sets switching frequency (100kHz–2MHz); tolerance directly impacts fSW accuracy. |
| VCC (Pin 12) | Internal Control Circuit Supply | Powered by PVCC; supplies bias for logic, amplifiers, and comparators; requires ≥4.7µF bypass capacitor. |
| VIN (Pin 13) | VCC Regulator Input | Input to internal LDO generating VCC; senses input for UVLO; requires 0.1µF local bypass near pin. |
| PVCC (Pin 14) | VCC Regulator Output | 5V LDO output powering gate drivers and control circuitry; must be short-traced and bonded to VCC. |
| BST2 (Pin 15) | SW2 Gate Drive Bootstrap | Connects via 0.1µF capacitor to SW2; generates floating rail for high-side switch D gate drive. |
| BST1 (Pin 16) | SW1 Gate Drive Bootstrap | Connects via 0.1µF capacitor to SW1; generates floating rail for high-side switch A gate drive. |
| PVIN (Pin 17) | Main Power Input | Primary input to power switches; requires ≥4.7µF ceramic + optional 47µF bulk capacitor for transient response. |
| SW1 (Pin 18) | Buck-Boost Power Switch Node | Connects to other end of inductor; drives input-side switch (A); shares same layout constraints as SW2. |
| PWM/SYNC (Pin 19) | Mode Control & Clock Input | Selects Burst Mode® (low), PWM (high), or syncs to external 100kHz–2MHz clock; logic threshold 0.5–1.5V. |
Key Features
| Feature | Design Value |
|---|---|
| Four-switch synchronous buck-boost topology | Enables continuous regulation across VIN < VOUT, VIN = VOUT, and VIN > VOUT without manual mode switching or efficiency cliffs. |
| Ultralow-noise PWM switching algorithm | Eliminates subharmonics and mode-transition transients, reducing conducted EMI and simplifying filter design in automotive EMC-critical zones. |
| Integrated 5V VCC LDO with 110mA current limit | Self-powered gate drivers and control circuitry reduce external component count; eliminates need for auxiliary bias supply. |
| AEC-Q100 qualified (Grade I, –40°C to +125°C) | Validated for under-hood automotive applications including infotainment power supplies and ADAS camera modules. |
| Programmable input UVLO with hysteresis | Allows custom brown-in/brown-out thresholds (e.g., 9V/10V for 12V battery systems) using two external resistors on RUN pin. |
| Internal soft-start (9ms typical) | Prevents inrush current into output capacitors during startup; avoids tripping upstream fuse or causing bus droop in multi-rail systems. |
Applications
| Automotive Infotainment Power | Industrial 24V Field Bus Converter |
|---|---|
Use Scenario: Powering 5V/3.3V subsystems (DSPs, displays, USB ports) from a 12V/24V vehicle battery subject to cold-crank (4.5V) and load-dump (40V) events. IC Role / Device Role / Timing Role: Primary buck-boost regulator maintaining stable output despite wide input excursions; operates continuously through cranking. Use Value: Eliminates need for separate pre-regulator and post-regulator stages; achieves >90% efficiency at 1A load across 6V–36V input range. |
Use Scenario: Generating isolated 5V/12V rails for PLC I/O modules powered from unregulated 24V industrial bus with ±20% tolerance. IC Role / Device Role / Timing Role: Non-isolated DC/DC converter delivering regulated outputs from noisy, fluctuating field bus supply. Use Value: Maintains regulation down to 2.7V input, enabling operation during brownouts; 2A capability supports multiple downstream LDOs. |
| FireWire® Power Delivery | Battery-Powered Telematics Unit |
Use Scenario: Providing 5V/1.5A power from IEEE 1394 FireWire cable (28–40V nominal, high source impedance) to peripheral devices. IC Role / Device Role / Timing Role: High-input-voltage buck-boost converter with low quiescent current and robust start-up under weak-source conditions. Use Value: Starts reliably at 2.7V input; 30µA no-load current in Burst Mode® minimizes parasitic drain on FireWire host port. |
Use Scenario: Power management for GPS/GSM telematics units operating from 3.6V Li-ion batteries with extended sleep periods. IC Role / Device Role / Timing Role: Primary system regulator enabling deep-sleep states with 3µA shutdown current and fast wake-up via RUN pin. Use Value: Extends battery life beyond 1 year in periodic-reporting mode; soft-start prevents voltage sag during wake-up bursts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost converter 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. | Preferred for >40V industrial or solar inputs; less suitable for space-constrained automotive modules due to external FET layout. | Select LT8390A when input exceeds 40V or >2A continuous load is required; accept added BOM and layout complexity. |
| TPS63060DSCR | Lower 18V max input; 2.5A output; 3.5µA shutdown current; no AEC-Q100 qualification; smaller 3mm × 2mm QFN. | Targeted at portable consumer electronics; lacks automotive temperature grade and UVLO programmability. | Choose TPS63060 for cost-sensitive, non-automotive battery-powered designs where input stays below 18V. |
Compared with LT8390A and TPS63060, the LTC3115IFE-1#PBF uniquely balances 40V operation, AEC-Q100 compliance, integrated gate drivers, and programmable UVLO - making it the optimal choice for automotive and industrial buck-boost applications demanding reliability across wide input ranges without external FETs.
Availability
LTC3115IFE-1#PBF is available at Aetrix Electronics and suitable for automotive infotainment power systems, industrial 24V field bus converters, and battery-powered telematics units requiring stable component supply with guaranteed long-term availability.
Supply support for LTC3115IFE-1#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 (now part of Analog Devices, Inc., a wholly owned subsidiary of Analog Devices, Inc.) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LTC3115-1 product line delivers high-voltage, high-efficiency buck-boost regulators for automotive, industrial, and telecom applications where input voltage varies widely and reliability under harsh conditions is critical.
FAQ
What is the maximum output current capability of the LTC3115IFE-1#PBF in buck-only operation?
The LTC3115IFE-1#PBF delivers up to 2A continuous output current when operating in step-down (buck) mode with VIN ≥ 6V and VOUT = 5V. This is confirmed in the Electrical Characteristics table under "2A Output Current in Step-Down Operation for VIN ≥ 6V". Performance remains stable across the full –40°C to +125°C junction temperature range.
Does the LTC3115IFE-1#PBF support synchronization to an external clock, and what is the valid frequency range?
Yes, the LTC3115IFE-1#PBF supports external clock synchronization via the PWM/SYNC pin across 100kHz to 2MHz. The datasheet specifies "Synchronizable Up to 2MHz with an External Clock" and confirms logic-level compatibility (0.5V–1.5V threshold) and minimum pulse width (100ns) for reliable locking.
Is the LTC3115IFE-1#PBF qualified for automotive applications, and which AEC-Q100 grade does it meet?
Yes, the LTC3115IFE-1#PBF is AEC-Q100 qualified for automotive applications. Per the Order Information table, the "IFE-1" suffix denotes Industrial grade (–40°C to +125°C), and the datasheet explicitly lists "AEC-Q100 Qualified for Automotive Applications" under FEATURES - confirming qualification for under-hood and cabin systems.
How is the switching frequency programmed on the LTC3115IFE-1#PBF, and what resistor value yields 1MHz?
Switching frequency is set by a resistor (RT) from Pin 9 (RT) to GND. For 1MHz operation, the datasheet's Electrical Characteristics table shows "Oscillator Frequency" with RT = 35.7kΩ yielding 1000kHz (typical). The oscillator frequency vs. RT curve (Figure G26) confirms this relationship is linear and monotonic across the 100kΩ–10MΩ range.
What is the purpose of the BST1 and BST2 pins on the LTC3115IFE-1#PBF, and what external components are required?
BST1 and BST2 are bootstrap capacitor connections for the high-side gate drivers of switches A and D. Each requires a 0.1µF ceramic capacitor between the BST pin and its respective switch node (BST1→SW1, BST2→SW2). These capacitors generate the floating gate-drive voltage needed to fully enhance the N-channel high-side MOSFETs across the full input range.
LTC3115IFE-1#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-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):
- 40V
- Voltage - Output (Min/Fixed):
- 2.7V
- Voltage - Output (Max):
- 40V
- Current - Output:
- 1A, 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-1#PBF FAQ
1.How can I place an order for LTC3115IFE-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3115IFE-1#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 LTC3115IFE-1#PBF reliable?
The price and inventory of LTC3115IFE-1#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3115IFE-1#PBF is usually 5 days.
3.What payment methods are accepted for LTC3115IFE-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3115IFE-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3115IFE-1#PBF?
LTC3115IFE-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3115IFE-1#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 LTC3115IFE-1#PBF?
For technical support, including LTC3115IFE-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3115IFE-1#PBF requirements.
6.How does Aetrix verify that LTC3115IFE-1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3115IFE-1#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 LTC3115IFE-1#PBF meets industry standards.
7.What is the process for return or replacement of LTC3115IFE-1#PBF?
All LTC3115IFE-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3115IFE-1#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 LTC3115IFE-1#PBF part is unused and in its original packaging.
Return procedure for LTC3115IFE-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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