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Analog Devices Inc. LTC3115EFE-1#PBF
- Part No.:
- LTC3115EFE-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3115EFE-1#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:363
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Product details
Overview
LTC3115EFE-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 LTC3115EFE-1#PBF datasheet, LTC3115EFE-1#PBF pinout, LTC3115EFE-1#PBF application, or LTC3115EFE-1#PBF equivalent, key selection criteria include its 2A step-down capability at VIN ≥ 6V, internal soft-start, 3µA shutdown current, AEC-Q100 qualification for automotive use, and thermally enhanced 20-lead TSSOP package with exposed PGND pad.
Technical Context
The LTC3115EFE-1#PBF implements a four-switch synchronous buck-boost topology with proprietary low-noise PWM control, enabling continuous regulation when VIN < VOUT (boost), VIN > VOUT (buck), or VIN ≈ VOUT (buck-boost transition zone). Its voltage-mode control loop uses an internal 1000mV feedback reference and supports external synchronization up to 2MHz via the PWM/SYNC pin.
It integrates dual bootstrap drivers (BST1/BST2) for high-side N-channel switches, a 4.45V VCC regulator with 50mA current limit, programmable input UVLO (2.7V threshold, 100mV hysteresis), and reverse inductor current limiting (−1.5A) - all operating across −40°C to +125°C junction temperature range in the FE-package variant.
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-converter solutions for variable-output systems like telecom bias supplies. |
| 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 (RT-programmable) - allows trade-off between inductor size (e.g., 5.2µH at 2MHz) and efficiency (peak 95%). |
| Quiescent Current | 50µA in Burst Mode®, 3µA in shutdown - extends battery life in always-on automotive sensors or telematics modules. |
| Feedback Reference | 1000mV ±23mV - sets output voltage via resistor divider; enables precise 5V, 12V, or 24V regulation with <0.1% line/load regulation. |
| Thermal Rating | −40°C to +125°C operating junction temperature - qualified per AEC-Q100 Grade 1 for under-hood automotive applications. |
Pinout & Package
The LTC3115EFE-1#PBF is housed in a 20-lead plastic TSSOP package (FE) with exposed PGND pad (Pin 21) requiring soldering to PCB ground plane for thermal performance (θJA = 38°C/W). Pin numbering follows top-view orientation with Pin 1 at bottom-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (Pins 1, 10, 11, 20, Exposed Pad 21) | Power Ground Return | Low-impedance return path for switch currents; exposed pad must be soldered to PCB ground plane for thermal management and EMI reduction. |
| RUN (Pin 2) | Enable & UVLO Threshold Input | Drives IC enable/disable; resistor divider from VIN sets custom undervoltage lockout (1.21V nominal threshold). |
| SW2 (Pin 3) | Buck-Boost Power Switch Node | Connects to one end of inductor; drives output during boost phase and provides reverse-current blocking path. |
| PVOUT (Pin 4) | Power Output Supply Rail | High-current output node requiring ≥10µF low-ESR capacitor; Schottky diode recommended for VOUT >20V short-circuit protection. |
| GND (Pins 5, 6) | Signal Ground Reference | Reference for FB, VC, RT, and internal analog circuitry; must be star-connected to PGND at single point to avoid noise coupling. |
| VC (Pin 7) | Error Amplifier Output | Connects to FB via RC compensation network to stabilize control loop; determines transient response and phase margin. |
| FB (Pin 8) | Feedback Voltage Input | Senses output via resistor divider; 1000mV reference enables accurate VOUT setting with <50nA input bias current. |
| 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 error amp, oscillator, and logic; requires ≥4.7µF bypass capacitor. |
| VIN (Pin 13) | VCC Regulator Input & Sense | Supplies internal LDO generating VCC; also senses input for UVLO; requires 0.1µF local bypass. |
| PVCC (Pin 14) | VCC Regulator Output & Gate Drive Supply | Provides gate drive voltage for all N-channel switches; must be short-traced to VCC to minimize ringing. |
| BST2 (Pin 15) | Bootstrap Capacitor for SW2 | Connects via 0.1µF capacitor to SW2; generates floating gate drive rail for high-side switch D in boost mode. |
| BST1 (Pin 16) | Bootstrap Capacitor for SW1 | Connects via 0.1µF capacitor to SW1; generates floating gate drive rail for high-side switch A in buck mode. |
| PVIN (Pin 17) | Main Power Input Rail | Primary input connection for power stage; requires ≥4.7µF ceramic + optional 47µF bulk capacitor for high-ESR sources. |
| SW1 (Pin 18) | Buck-Boost Power Switch Node | Connects to other end of inductor; active during buck phase and provides current path during transition modes. |
| PWM/SYNC (Pin 19) | Mode Control & Clock Input | High = fixed-frequency PWM; low = Burst Mode®; external clock ≤2MHz synchronizes switching with system timing. |
Key Features
| Feature | Design Value |
|---|---|
| Four-switch synchronous topology | Eliminates need for external MOSFETs and gate drivers; reduces BOM count and layout complexity in wide-input-range designs. |
| Seamless buck/boost/buck-boost transitions | Prevents output voltage glitches or inductor current discontinuities during VIN crossing VOUT - critical for stable microcontroller supply rails. |
| Internal soft-start (9ms typical) | Controls inrush current during startup; prevents input voltage sag and output overshoot in battery-powered systems. |
| Reverse inductor current limit (−1.5A) | Protects against destructive reverse current flow during output short-circuit or sudden load removal events. |
| AEC-Q100 Grade 1 qualification | Validated for automotive under-hood environments including temperature cycling, vibration, and ESD robustness testing. |
| Output disconnect in shutdown | Isolates VOUT from PVIN/PVOUT during disable state - prevents back-powering of downstream circuits in safety-critical systems. |
Applications
| Automotive Power Systems | Industrial 24V/28V Supplies |
|---|---|
Use Scenario: Powering infotainment head units from vehicle battery (9V–16V) while maintaining 5V/3.3V rails during cold-crank (4.5V) or load-dump (40V) transients. IC Role / Device Role / Timing Role: Primary buck-boost regulator providing regulated output independent of input fluctuations. Use Value: Eliminates need for separate pre-regulator and post-regulator stages; withstands AEC-Q100 load-dump pulses up to 40V. | Use Scenario: Generating stable 12V or 24V outputs from unregulated factory floor power buses subject to brownouts and surges. IC Role / Device Role / Timing Role: Wide-input DC/DC converter delivering constant output despite ±20% input variation. Use Value: Supports continuous operation across 2.7V–40V input without manual reconfiguration or component change. |
| Telecom & Networking Equipment | FireWire Regulator |
Use Scenario: Biasing optical transceivers and FPGAs in 48V telecom systems where intermediate 3.3V/5V/12V rails are required. IC Role / Device Role / Timing Role: Efficient intermediate bus converter supporting hot-swap and redundancy requirements. Use Value: Achieves >90% efficiency at 1A load with 48V input; programmable frequency avoids noise-sensitive bands. | Use Scenario: Regulating FireWire (IEEE 1394) bus power (25V–40V) to 5V/1.8V for connected peripherals. IC Role / Device Role / Timing Role: High-voltage buck-boost converter compliant with FireWire power delivery specifications. Use Value: Handles FireWire's wide input range without external step-down; Burst Mode® reduces standby power in idle devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8390AEMSE#PBF | Higher 60V input rating, 3.5A output, spread-spectrum modulation; requires external MOSFETs and more complex compensation. | Preferred for >40V inputs (e.g., 48V industrial) or higher current demands (>2A); less suitable for space-constrained automotive modules. | Select LT8390A when input may exceed 40V or peak load exceeds 2A; LTC3115EFE-1#PBF offers lower BOM count and simpler layout for ≤40V systems. |
| TPS63070DDAR | Narrower 2.7V–16V input, 2.4A output, no AEC-Q100 qualification; integrated compensation, smaller 12-pin WSON package. | Targeted at consumer/portable electronics; lacks automotive qualification and high-voltage robustness for 24V+ systems. | Choose TPS63070 for cost-sensitive, non-automotive applications below 16V input; LTC3115EFE-1#PBF remains optimal for automotive and industrial 24V/40V designs. |
Compared with LT8390AEMSE#PBF and TPS63070DDAR, the LTC3115EFE-1#PBF uniquely balances 40V operation, AEC-Q100 compliance, integrated power switches, and minimal external components - making it the most direct fit for space- and reliability-constrained automotive buck-boost applications.
Availability
LTC3115EFE-1#PBF is available at Aetrix Electronics and suitable for automotive power systems, industrial 24V/28V supplies, and telecom equipment requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC3115EFE-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3115 product line delivers high-voltage, high-efficiency buck-boost converters designed specifically for automotive and industrial power systems where input voltage varies widely and reliability under harsh conditions is mandatory.
FAQ
What is the maximum output current capability of the LTC3115EFE-1#PBF in buck versus boost configurations?
The LTC3115EFE-1#PBF delivers up to 2A output current in step-down (buck) operation when VIN ≥ 6V and VOUT = 5V. In boost mode (VIN < VOUT), maximum output current is 1A at VIN ≥ 3.6V and VOUT = 5V. These values reflect thermal limits and switch RDS(on) constraints specified in the datasheet under standard PCB layout conditions.
Does the LTC3115EFE-1#PBF support synchronization to an external clock, and what are the voltage and frequency limits?
Yes, the LTC3115EFE-1#PBF supports external clock synchronization via the PWM/SYNC pin. It accepts TTL/CMOS-compatible signals from 100kHz to 2MHz with logic-high threshold of 0.5V–1.5V and maximum pin voltage of 5.5V. Pulse width must exceed 100ns for reliable locking, and the device maintains seamless mode transitions during sync.
How does the RUN pin function on the LTC3115EFE-1#PBF, and can it be used to set a custom input undervoltage lockout threshold?
The RUN pin on the LTC3115EFE-1#PBF serves dual functions: enabling/disabling the IC and programming input UVLO. When driven above 1.21V (typical), the device enables; a resistor divider from VIN to GND sets precise UVLO thresholds (e.g., 2.7V with 100mV hysteresis). The pin sources 0.5µA for hysteresis and must not exceed VIN + 0.3V.
What thermal management requirements apply to the LTC3115EFE-1#PBF in its 20-lead TSSOP (FE) package?
The LTC3115EFE-1#PBF in the FE package requires soldering of the exposed PGND pad (Pin 21) to the PCB ground plane to achieve rated thermal performance (θJA = 38°C/W). Insufficient pad connection increases junction temperature, potentially triggering overtemperature protection or reducing lifetime. Thermal vias under the pad are strongly recommended for high-current operation.
Is the LTC3115EFE-1#PBF qualified for automotive applications, and which AEC-Q100 grade does it meet?
Yes, the LTC3115EFE-1#PBF is AEC-Q100 qualified for automotive applications and meets Grade 1 specifications (−40°C to +125°C operating junction temperature). This qualification covers stress testing for temperature cycling, humidity, mechanical shock, and ESD - confirming suitability for under-hood and body-control module deployments.
LTC3115EFE-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
LTC3115EFE-1#PBF FAQ
1.How can I place an order for LTC3115EFE-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3115EFE-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 LTC3115EFE-1#PBF reliable?
The price and inventory of LTC3115EFE-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 LTC3115EFE-1#PBF is usually 5 days.
3.What payment methods are accepted for LTC3115EFE-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3115EFE-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3115EFE-1#PBF?
LTC3115EFE-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3115EFE-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 LTC3115EFE-1#PBF?
For technical support, including LTC3115EFE-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3115EFE-1#PBF requirements.
6.How does Aetrix verify that LTC3115EFE-1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3115EFE-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 LTC3115EFE-1#PBF meets industry standards.
7.What is the process for return or replacement of LTC3115EFE-1#PBF?
All LTC3115EFE-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3115EFE-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 LTC3115EFE-1#PBF part is unused and in its original packaging.
Return procedure for LTC3115EFE-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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