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Analog Devices Inc. LTC3115EFE-2#PBF
- Part No.:
- LTC3115EFE-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3115EFE-2#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:100
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Product details
Overview
LTC3115EFE-2#PBF from Analog Devices is a 40V, 2A monolithic synchronous buck-boost DC/DC converter optimized for fast input transients (<1ms). It supports 2.7V–40V input and output ranges, delivers up to 2A in step-down mode (VIN ≥ 6V), operates at programmable frequencies up to 2MHz, and features Burst Mode® for 30µA no-load quiescent current-ideal for automotive power systems with wide-input battery or industrial 24V/28V rails.
For engineers reviewing the LTC3115EFE-2#PBF datasheet, LTC3115EFE-2#PBF pinout, LTC3115EFE-2#PBF application, or LTC3115EFE-2#PBF equivalent, key selection criteria include its seamless buck-boost mode transition, AEC-Q100 qualification, 3µA shutdown current, thermal performance in the 20-lead TSSOP package, and compatibility with FireWire, telecom, and multi-source supply designs.
Technical Context
The LTC3115EFE-2#PBF implements a proprietary four-switch synchronous buck-boost topology with internal N-channel DMOS switches (150mΩ each) and dual bootstrapped gate drivers (BST1/BST2). Its voltage-mode control loop enables stable regulation across VIN = VOUT, VIN < VOUT (boost), and VIN > VOUT (buck) without subharmonic oscillation or output transients.
It integrates programmable frequency PWM operation (100kHz–2MHz via RT resistor), external clock synchronization (PWM/SYNC pin), input undervoltage lockout with hysteresis (2.725V nominal, 100mV hysteresis), and internal soft-start (9ms). The device supports output disconnect in shutdown and includes short-circuit protection and reverse inductor current limiting (−1.5A).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 40V - supports lead-acid, USB, 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). |
| Max Output Current | 2A in step-down (VIN ≥ 6V) - sufficient for powering FPGAs, microcontrollers, and analog subsystems directly. |
| Switching Frequency | 100kHz to 2MHz (RT-programmable) - allows trade-off between efficiency and size: 2MHz enables ≤5.2µH inductors for ultra-compact layouts. |
| Quiescent Current | 30µA in Burst Mode® (no load) - extends battery life in always-on automotive sensors or IoT edge nodes. |
| Shutdown Current | 3µA - ensures minimal drain during system sleep or fault isolation. |
| Efficiency | Up to 95% - achieved at mid-load with optimized layout; maintains >85% down to 10mA in PWM mode. |
Pinout & Package
The LTC3115EFE-2#PBF is housed in a thermally enhanced 20-lead plastic TSSOP package (JEDEC MO-153) with exposed PGND pad (Pin 21) requiring soldering to PCB ground plane for rated thermal performance (θJA = 38°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN (Pin 2) | Enable/UVLO control input | Drives IC enable/disable; sets custom input UVLO threshold via resistor divider; sources 0.5µA hysteresis current when active. |
| SW2 (Pin 3) | Buck-boost power switch node | Connects to one end of inductor; drives high-side switch D in boost mode and low-side switch C in buck mode. |
| PVOUT (Pin 4) | Power output rail | Delivers regulated output; requires ≥10µF low-ESR capacitor close to IC; Schottky diode recommended for VOUT > 20V short-circuit protection. |
| GND (Pins 5,6) | Signal ground reference | Reference for FB, VC, RT, RUN; must be low-impedance connection separate from PGND traces to avoid noise coupling. |
| FB (Pin 8) | Feedback voltage sense | Sets output voltage via resistor divider; nominal 1000mV threshold; sensitive to switching noise-requires guarded routing away from SW pins. |
| RT (Pin 9) | Oscillator frequency programming | Resistor to GND sets switching frequency (e.g., 35.7kΩ → 1MHz); enables precise EMI control and layout optimization. |
| VCC (Pin 12) | Internal logic supply input | Must be tied directly to PVCC; powers control circuitry; requires ≥4.7µF bypass capacitor to suppress ripple-induced instability. |
| PWM/SYNC (Pin 19) | Mode control & sync input | High = fixed-frequency PWM; Low = Burst Mode®; external clock input synchronizes switching to system timing source (100ns min pulse width). |
| PGND (Pins 1,10,11,20,21) | Power ground return | Exposes thermal pad (Pin 21) - must be soldered to large copper area connected to ground plane for thermal dissipation and low-noise power return. |
Key Features
| Feature | Design Value |
|---|---|
| Four-switch synchronous architecture | Enables true buck-boost operation without external MOSFETs; eliminates need for external diodes or complex control logic. |
| Seamless mode transitions | Proprietary algorithm prevents output voltage glitches or inductor current discontinuities when crossing VIN = VOUT boundary. |
| AEC-Q100 qualified (Grade E) | Rated for −40°C to +125°C junction temperature - validated for automotive infotainment, ADAS power supplies, and body electronics. |
| Integrated VCC linear regulator | Generates 4.45V ±1.2% from VIN (2.7V–40V); powers gate drivers and logic; eliminates need for external bias supply. |
| Reverse inductor current limit | −1.5A clamping protects against inductive kickback during short-circuit events - critical for motor drive or solenoid interfaces. |
Applications
| Automotive Power Systems | Industrial 24V/28V Supplies |
|---|---|
Use Scenario: Powering infotainment head units from 9V–16V battery with cold-crank dips to 3.6V and load-dump spikes to 40V. IC Role / Device Role / Timing Role: Primary buck-boost regulator maintaining stable 5V/3.3V rails despite rapid input transients. Use Value: Eliminates need for pre-boost stage or post-LDO filtering; reduces BOM count by integrating gate drivers and VCC LDO. | Use Scenario: Generating 12V/5V from unregulated 24V factory floor supply subject to brownouts and surges. IC Role / Device Role / Timing Role: Wide-input DC/DC converter delivering regulated outputs for PLC I/O modules and sensor signal chains. Use Value: Supports direct connection to industrial bus without external transient suppressors; 95% peak efficiency lowers thermal load in enclosed cabinets. |
| FireWire Regulator | Multi-Source Power Supplies |
Use Scenario: Converting FireWire's 28–40V unregulated bus to stable 12V for IEEE 1394 PHY and controller ICs. IC Role / Device Role / Timing Role: High-voltage buck-boost regulator handling variable FireWire input while meeting strict EMI limits. Use Value: Programmable 2MHz switching enables compact filter design; Burst Mode® meets standby current requirements for hot-plug compliance. | Use Scenario: Single power stage accepting inputs from USB-C PD (5–20V), Li-ion battery (3–4.2V), and wall adapter (9–12V) to generate consistent 3.3V system rail. IC Role / Device Role / Timing Role: Universal input DC/DC converter enabling flexible power architecture in portable test equipment. Use Value: 2.7V start-up and 40V absolute max rating allow seamless source handover; RT programming adapts frequency per source impedance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3115EDHD-2#PBF | Same die, 16-lead 4mm × 5mm DFN package; θJA = 43°C/W vs. 38°C/W for TSSOP; no Pin 1/10/11 PGND terminals. | Better suited for space-constrained layouts where thermal mass is available; less robust PGND connection than TSSOP's multiple pins + exposed pad. | Select when board area is critical and thermal budget permits higher junction rise; verify PCB copper area under DFN exposed pad. |
| MAX20404ATG+T | 36V max input, 3.5A output, integrated inductor option; no Burst Mode®, higher 25µA no-load IQ; different pinout and compensation scheme. | Targets compact consumer devices; lacks AEC-Q100 qualification and 40V capability needed for automotive/load-dump resilience. | Consider only for non-automotive, lower-voltage applications where integrated inductor simplifies layout and 25µA IQ is acceptable. |
Compared with LTC3115EDHD-2#PBF, the LTC3115EFE-2#PBF offers superior thermal performance and more robust PGND connectivity for high-current industrial use; versus MAX20404ATG+T, it provides wider voltage range, automotive qualification, and lower standby current-critical for battery-backed or safety-critical systems.
Availability
LTC3115EFE-2#PBF is available at Aetrix Electronics and suitable for automotive power systems, industrial 24V/28V supplies, FireWire regulators, and multi-source power supplies requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.
Supply support for LTC3115EFE-2#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3115-2 product line was designed specifically for high-reliability, wide-input-voltage power conversion in harsh environments-emphasizing transient resilience, thermal robustness, and integration to reduce external component count in automotive and industrial applications.
FAQ
What is the maximum input voltage rating for the LTC3115EFE-2#PBF?
The LTC3115EFE-2#PBF has an absolute maximum input voltage rating of 45V on VIN, PVIN, and PVOUT pins. Its operational input range is specified from 2.7V to 40V, making it suitable for automotive load-dump conditions and industrial 28V/40V rails. Exceeding 45V risks permanent damage per Absolute Maximum Ratings.
Does the LTC3115EFE-2#PBF support synchronization to an external clock?
Yes, the LTC3115EFE-2#PBF supports external clock synchronization via the PWM/SYNC pin (Pin 19). When driven with a clean TTL/CMOS clock signal between 100kHz and 2MHz, the device locks its switching frequency and phase to the external source-enabling EMI reduction and deterministic timing in multi-rail systems.
How does the RUN pin function on the LTC3115EFE-2#PBF?
The RUN pin (Pin 2) serves dual functions: enabling/disabling the IC and setting custom input undervoltage lockout (UVLO). It activates when voltage exceeds 1.21V (typical), sources 0.5µA hysteresis current, and must not exceed VIN + 0.3V. For fixed enable, tie directly to VIN; for adjustable UVLO, use a resistor divider from VIN to GND.
What thermal considerations apply to the LTC3115EFE-2#PBF in the 20-lead TSSOP package?
The LTC3115EFE-2#PBF in FE package has θJA = 38°C/W and requires soldering of the exposed PGND pad (Pin 21) to a large PCB ground plane for rated thermal performance. Without proper thermal land design, junction temperature rise will exceed specifications-especially at >1A loads. Thermal derating above 125°C junction is required per datasheet Note 2.
Can the LTC3115EFE-2#PBF operate with output voltages below 2.7V?
No, the LTC3115EFE-2#PBF is not specified to regulate output voltages below 2.7V. Its feedback reference is trimmed to 1000mV ±1.7%, and minimum output is constrained by internal circuitry and stability limits. Attempting sub-2.7V operation may result in loss of regulation, increased ripple, or failure to start-designs requiring lower outputs should select alternative converters.
LTC3115EFE-2#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:
- 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
LTC3115EFE-2#PBF FAQ
1.How can I place an order for LTC3115EFE-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3115EFE-2#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-2#PBF reliable?
The price and inventory of LTC3115EFE-2#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-2#PBF is usually 5 days.
3.What payment methods are accepted for LTC3115EFE-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3115EFE-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3115EFE-2#PBF?
LTC3115EFE-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3115EFE-2#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-2#PBF?
For technical support, including LTC3115EFE-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3115EFE-2#PBF requirements.
6.How does Aetrix verify that LTC3115EFE-2#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3115EFE-2#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-2#PBF meets industry standards.
7.What is the process for return or replacement of LTC3115EFE-2#PBF?
All LTC3115EFE-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3115EFE-2#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-2#PBF part is unused and in its original packaging.
Return procedure for LTC3115EFE-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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