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Analog Devices Inc. LTC3115MPFE-1#PBF
- Part No.:
- LTC3115MPFE-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3115MPFE-1#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,072
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Product details
Overview
LTC3115MPFE-1#PBF from Analog Devices is a high-voltage monolithic synchronous buck-boost DC/DC converter supporting 2.7V to 40V input and output voltage ranges, delivering up to 2A in step-down mode (VIN ≥ 6V), featuring programmable 100kHz–2MHz switching frequency, Burst Mode® operation with 50µA no-load quiescent current, and AEC-Q100 qualification for automotive power systems.
For engineers reviewing the LTC3115MPFE-1#PBF datasheet, LTC3115MPFE-1#PBF pinout, LTC3115MPFE-1#PBF application, or LTC3115MPFE-1#PBF equivalent, key selection considerations include wide VIN/VOUT compatibility, thermal performance across –55°C to 150°C, integrated gate drivers with BST1/BST2 flying capacitor support, and seamless buck/boost/buck-boost mode transitions without output disturbance.
Technical Context
The LTC3115MPFE-1#PBF implements a four-switch synchronous buck-boost topology with internal N-channel DMOS switches (150mΩ each), proprietary voltage-mode control with seamless mode transitions, and dual gate drive rails generated via BST1 and BST2 flying capacitors. It supports both internal oscillator (RT-programmed) and external clock synchronization via PWM/SYNC pin.
Its operational architecture includes independent VCC regulation (4.45V typical), programmable input UVLO with hysteresis, internal soft-start (9ms), reverse inductor current limiting (–1.5A), and overtemperature protection. The device maintains regulation across VIN = VOUT, VIN < VOUT (boost), and VIN > VOUT (buck) without discontinuity in inductor current or control loop behavior.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 40V - enables direct interface with lead-acid, Li-ion, FireWire, and industrial 24V/28V rails without pre-regulation. |
| Output Voltage Range | 2.7V to 40V - supports fixed or adjustable outputs via FB resistor divider; nominal feedback voltage is 1000mV ±23mV. |
| 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 - set by RT resistor or synchronized externally; higher frequencies allow smaller inductors (e.g., 5.2µH at 2MHz). |
| Quiescent Current | 50µA in Burst Mode®, 3µA in shutdown - extends battery life in always-on automotive or IoT edge nodes. |
| Operating Temp Range | –55°C to +150°C junction - qualified per AEC-Q100 Grade MP, suitable for under-hood automotive and harsh industrial environments. |
| Efficiency | Up to 95% - achieved with low RDS(on) switches and optimized gate drive, reducing thermal stress on PCB layout. |
Pinout & Package
The LTC3115MPFE-1#PBF is housed in a thermally enhanced 20-lead plastic TSSOP package (FE) with exposed PGND pad (Pin 21) requiring soldering to PCB ground plane for rated thermal performance (θJA = 38°C/W). Pin count and function mapping match the LTC3115-1 family DHD/FE pinout standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PIN 1 (PGND) | Power Ground | Primary return path for high-current switch nodes SW1/SW2; must be low-impedance connection to PCB ground plane. |
| PIN 2 (RUN) | Enable & UVLO Control | Logic-enable input with 1.21V threshold; resistor divider from VIN sets custom undervoltage lockout with 100mV hysteresis. |
| PIN 3 (SW2) | Boost-Side Power Switch | Connects to one end of buck-boost inductor; drives PVOUT during boost phase; requires external BST2 flying capacitor. |
| PIN 4 (PVOUT) | Power Output Rail | High-current output node; requires ≥10µF low-ESR ceramic capacitor placed adjacent to IC with short ground return. |
| PINS 5,6 (GND) | Signal Ground | Analog reference for FB, VC, RT; must be isolated from PGND until single-point star ground near IC. |
| PIN 7 (VC) | Error Amplifier Output | Compensation node for feedback loop; connects to FB via RC network to stabilize regulation across all operating modes. |
| PIN 8 (FB) | Voltage Feedback Input | Senses output via resistor divider; 1000mV nominal reference enables precise output setting with <0.1% line regulation. |
| PIN 9 (RT) | Oscillator Programming | Resistor-to-ground sets switching frequency (e.g., 35.7kΩ → 1MHz); supports external clock injection via PWM/SYNC. |
| PIN 12 (VCC) | Internal Logic Supply | Low-voltage rail (4.45V) for control circuitry; must be tied directly to PVCC with ≥4.7µF bypass capacitor. |
| PIN 13 (VIN) | VCC Regulator Input | Supplies internal LDO generating VCC; senses input for UVLO; requires 0.1µF local bypass capacitor. |
| PIN 14 (PVCC) | VCC Regulator Output | Output of internal LDO; powers gate drivers and logic; must be short-traced to VCC and bypassed to PGND. |
| PIN 15 (BST2) | SW2 Gate Drive Bootstrap | Connects via 0.1µF capacitor to SW2; generates floating gate drive voltage for high-side switch D in boost configuration. |
| PIN 16 (BST1) | SW1 Gate Drive Bootstrap | Connects via 0.1µF capacitor to SW1; generates floating gate drive voltage for high-side switch A in buck configuration. |
| PIN 17 (PVIN) | Main Power Input | High-current input node; requires ≥4.7µF ceramic + optional 47–100µF bulk capacitor; must connect directly to low-impedance source. |
| PIN 18 (SW1) | Buck-Side Power Switch | Connects to other end of buck-boost inductor; drives PGND during buck phase; requires external BST1 flying capacitor. |
| PIN 19 (PWM/SYNC) | Mode Control & Sync Input | High = fixed-frequency PWM; low = Burst Mode®; external clock input synchronizes switching up to 2MHz. |
| PINS 1,10,11,20,21 (PGND) | Power Ground Array | Multiple low-inductance paths for switch currents; exposed pad (Pin 21) is mandatory PGND connection for thermal and EMI performance. |
Key Features
| Feature | Design Value |
|---|---|
| Four-switch synchronous topology | Enables true buck-boost operation without polarity reversal or external diodes; eliminates subharmonic oscillation and mode-transition transients. |
| Integrated VCC LDO regulator | Generates stable 4.45V rail from VIN (2.7–40V); supports gate drivers and logic independently of output voltage, simplifying biasing. |
| Programmable UVLO with hysteresis | Configurable input lockout using RUN pin divider; 100mV hysteresis prevents chatter during brownout recovery. |
| Internal soft-start (9ms) | Controls output ramp rate to limit inrush current into large output capacitors; avoids tripping upstream current limits or causing system reset. |
| Reverse inductor current limit (–1.5A) | Prevents destructive reverse current flow during light-load or transient conditions in boost-dominant applications. |
| AEC-Q100 MP grade qualification | Validated for –55°C to +150°C operation with extended reliability testing; meets automotive under-hood and industrial mission-critical requirements. |
Applications
| Automotive Start-Stop Systems | Industrial 24V/28V Power Rails |
|---|---|
Use Scenario: Maintains stable 5V/12V supply during engine cranking when battery voltage dips to 3.6V. IC Role / Device Role / Timing Role: Buck-boost regulator providing uninterrupted power to infotainment, ADAS sensors, and CAN transceivers. Use Value: Seamless mode transition ensures zero output dropout during VIN drop below VOUT; 2A capability supports multi-rail SoC loads. | Use Scenario: Powers PLC I/O modules and fieldbus interfaces from unregulated 24V industrial supplies with ±25% tolerance. IC Role / Device Role / Timing Role: Wide-input DC/DC converter regulating 24V nominal input to 3.3V/5V/12V system rails. Use Value: 40V absolute max rating withstands load dump transients; 95% efficiency reduces heat sink requirements in sealed enclosures. |
| FireWire® Power Delivery | Battery-Powered Test Equipment |
Use Scenario: Converts FireWire bus voltage (8–40V) to regulated 5V/3.3V for portable instrumentation peripherals. IC Role / Device Role / Timing Role: Input-flexible buck-boost regulator enabling single-cable power+data connectivity. Use Value: No external pre-regulator needed; programmable frequency avoids EMI interference with data signaling bands. | Use Scenario: Powers handheld oscilloscopes and multimeters from 2-cell Li-ion (6–8.4V) while delivering 3.3V/5V/±12V rails. IC Role / Device Role / Timing Role: Primary DC/DC converter managing battery energy with ultra-low quiescent current. Use Value: 50µA Burst Mode current extends runtime in sleep state; 3µA shutdown enables years of shelf life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3115EFE-1#PBF | Same silicon, –40°C to +125°C temp grade, non-automotive qualification | Not AEC-Q100 qualified; unsuitable for under-hood automotive use | Select when industrial or commercial temperature range suffices and cost sensitivity is higher. |
| MAX20406AATJ+ | 3.5V–36V input, 0.8V–20V output, 3.5A max, integrated FETs, different pinout | Higher current but narrower voltage range; no BST pin architecture or same UVLO flexibility | Choose for higher output current needs where input stays above 3.5V and AEC-Q100 is not required. |
Compared with LTC3115EFE-1#PBF and MAX20406AATJ+, the LTC3115MPFE-1#PBF uniquely combines –55°C start-up capability, AEC-Q100 MP-grade reliability, and full 2.7V–40V operation-making it the only option for cold-cranking automotive systems and extended-temperature industrial deployments.
Availability
LTC3115MPFE-1#PBF is available at Aetrix Electronics and suitable for automotive start-stop systems, industrial 24V/28V power rails, FireWire® power delivery, and battery-powered test equipment requiring stable component supply across extreme temperature and voltage conditions.
Supply support for LTC3115MPFE-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 precision instrumentation, industrial automation, communications, and automotive markets.
The LTC3115MPFE-1#PBF belongs to the LTC® high-voltage buck-boost converter product line, designed specifically for robust power conversion in automotive, aerospace, and industrial applications demanding wide input/output range and extended temperature reliability.
FAQ
What is the maximum input voltage rating for the LTC3115MPFE-1#PBF?
The LTC3115MPFE-1#PBF has an absolute maximum input voltage rating of 45V on VIN, PVIN, and PVOUT pins. Its recommended operating input voltage range is 2.7V to 40V, making it suitable for automotive load dump and industrial 24V/28V rail applications. Exceeding 45V risks permanent damage per Absolute Maximum Ratings.
Does the LTC3115MPFE-1#PBF support external clock synchronization?
Yes, the LTC3115MPFE-1#PBF supports external clock synchronization via the PWM/SYNC pin. When driven with a clean TTL/CMOS clock signal between 100kHz and 2MHz, the device locks its switching to the external frequency in fixed-frequency PWM mode, enabling EMI reduction and deterministic noise placement in sensitive systems.
How does the RUN pin function on the LTC3115MPFE-1#PBF?
The RUN pin on the LTC3115MPFE-1#PBF serves dual functions: enabling/disabling the IC and programming input undervoltage lockout (UVLO). With a resistor divider from VIN to GND, it sets a precise UVLO threshold (nominally 1.21V with 100mV hysteresis); tying it directly to VIN provides continuous enable. It cannot exceed VIN + 0.3V.
What is the purpose of the BST1 and BST2 pins on the LTC3115MPFE-1#PBF?
The BST1 and BST2 pins on the LTC3115MPFE-1#PBF provide bootstrap gate drive voltages for the high-side N-channel MOSFETs in the four-switch buck-boost topology. Each connects via a 0.1µF capacitor to its respective switch node (SW1 or SW2) to generate floating gate drive rails, eliminating need for external high-side drivers or charge pumps.
Is the LTC3115MPFE-1#PBF pin-compatible with other variants in the LTC3115-1 family?
Yes, the LTC3115MPFE-1#PBF shares identical pinout and footprint with all FE-package variants (e.g., LTC3115EFE-1#PBF, LTC3115IFE-1#PBF), including the same 20-pin TSSOP layout and exposed PGND pad. This allows direct substitution within the same package variant, provided thermal and qualification requirements align with the target application.
LTC3115MPFE-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:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP-EP
LTC3115MPFE-1#PBF FAQ
1.How can I place an order for LTC3115MPFE-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3115MPFE-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 LTC3115MPFE-1#PBF reliable?
The price and inventory of LTC3115MPFE-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 LTC3115MPFE-1#PBF is usually 5 days.
3.What payment methods are accepted for LTC3115MPFE-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3115MPFE-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3115MPFE-1#PBF?
LTC3115MPFE-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3115MPFE-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 LTC3115MPFE-1#PBF?
For technical support, including LTC3115MPFE-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3115MPFE-1#PBF requirements.
6.How does Aetrix verify that LTC3115MPFE-1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3115MPFE-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 LTC3115MPFE-1#PBF meets industry standards.
7.What is the process for return or replacement of LTC3115MPFE-1#PBF?
All LTC3115MPFE-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3115MPFE-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 LTC3115MPFE-1#PBF part is unused and in its original packaging.
Return procedure for LTC3115MPFE-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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