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Analog Devices Inc. LTC3115MPFE-2#PBF
- Part No.:
- LTC3115MPFE-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3115MPFE-2#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,812
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Product details
Overview
LTC3115MPFE-2#PBF from Analog Devices is a high-voltage monolithic synchronous buck-boost DC/DC converter optimized for fast input voltage transients (<1 ms), supporting 2.7V–40V input and output ranges, delivering up to 2A in step-down mode (VIN ≥ 6V), and featuring programmable 100kHz–2MHz switching frequency with external clock synchronization capability - used in automotive power systems requiring robust transient response and wide-input compatibility.
For engineers reviewing the LTC3115MPFE-2#PBF datasheet, LTC3115MPFE-2#PBF pinout, LTC3115MPFE-2#PBF application, or LTC3115MPFE-2#PBF equivalent, key selection considerations include its –55°C to +150°C extended temperature grade, AEC-Q100 qualification, 20-lead TSSOP thermally enhanced package, and seamless buck-boost mode transitions under dynamic VIN conditions.
Technical Context
The LTC3115MPFE-2#PBF implements a proprietary four-switch synchronous buck-boost topology with internal N-channel DMOS switches (150 mΩ typical RDS(ON) per switch), enabling regulation when VIN is above, below, or equal to VOUT. Its voltage-mode control loop uses an internal 1000 mV feedback reference and supports both fixed-frequency PWM and low-quiescent-current Burst Mode operation.
It integrates a programmable oscillator (RT-pin controlled), internal soft-start (9 ms typical), input undervoltage lockout with adjustable threshold (2.7 V nominal), and output disconnect in shutdown. The device features dual bootstrapped gate drives (BST1/BST2), reverse current limiting (–1.5 A), and overtemperature protection - all configured for high-reliability industrial and automotive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7 V to 40 V - supports lead-acid battery, 24 V/28 V industrial rails, and unregulated adapters without external pre-regulation. |
| Output Voltage Range | 2.7 V to 40 V - enables single-supply generation of multiple system rails (e.g., 3.3 V, 5 V, 12 V, 24 V) from variable inputs. |
| Max Output Current | 2 A in step-down mode (VIN ≥ 6 V) - sufficient for powering microcontrollers, sensors, and communication interfaces in harsh environments. |
| Switching Frequency | 100 kHz to 2 MHz - allows trade-off between efficiency and size: higher frequencies enable smaller inductors (e.g., 5.2 µH at 2 MHz). |
| Quiescent Current | 3 µA in shutdown, 50 µA in Burst Mode (no load) - extends battery life in always-on automotive or remote monitoring applications. |
| Operating Temperature | –55°C to +150°C junction - qualified per AEC-Q100 Grade MP, suitable for under-hood and industrial control cabinet deployment. |
| Efficiency | Up to 95% at 5 V out / 1 A load - achieved via low-RDS(ON) switches and optimized gate drive, reducing thermal stress on PCB. |
Pinout & Package
Package: 20-lead plastic TSSOP (FE), thermally enhanced with exposed PGND pad (Pin 21), rated θJA = 38°C/W, θJC = 10°C/W. Must be soldered to PCB ground plane for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (Pins 1, 10, 11, 20, Exposed Pad 21) | Power Ground Reference | Low-impedance return path for high-current switch nodes; exposed pad must be soldered to PCB ground plane for thermal and electrical integrity. |
| RUN (Pin 2) | Enable & UVLO Threshold Input | Enables IC when >1.21 V; resistor divider from VIN sets custom input undervoltage lockout; 0.5 µA hysteresis current ensures clean turn-on/off. |
| SW2 (Pin 3) | Buck-Boost Power Switch Node | Connects to one end of inductor; drives output during boost phase; requires Schottky clamp diode to PVOUT if VOUT > 20 V or short-circuit risk exists. |
| PVOUT (Pin 4) | Power Output Supply Rail | Delivers regulated output; requires ≥10 µF low-ESR capacitor placed adjacent to IC with short ground return path. |
| GND (Pins 5, 6) | Signal Ground Reference | Reference for control circuitry (FB, VC, RT); must be isolated from noisy PGND traces except at single-point star ground. |
| VC (Pin 7) | Error Amplifier Output | Connects to FB via compensation network (e.g., RC series) to stabilize voltage loop; sensitive to noise - route away from SW pins. |
| FB (Pin 8) | Feedback Voltage Input | Sets output voltage via resistor divider; nominal 1000 mV reference; high-impedance input (≤50 nA bias) minimizes divider loading. |
| RT (Pin 9) | Oscillator Frequency Programming | Resistor to GND sets switching frequency (e.g., 35.7 kΩ → 1 MHz); tolerance directly impacts fSW accuracy (±10% typ). |
| VCC (Pin 12) | Internal Control Circuit Supply | Powered by PVCC; must be tied directly to PVCC; bypassed with ≥4.7 µF capacitor to suppress supply ripple affecting regulation. |
| VIN (Pin 13) | VCC Regulator Input & Sense | Feeds internal LDO generating VCC; also senses input for UVLO; bypassed with 0.1 µF capacitor close to pin. |
| PVCC (Pin 14) | VCC Regulator Output & Gate Drive Supply | Provides ~4.45 V regulated rail for logic and gate drivers; must be short-connected to VCC; additional local bypass recommended if trace long. |
| BST2 (Pin 15) | SW2 Gate Drive Bootstrap | Connected to SW2 via 0.1 µF capacitor; generates floating high-side gate voltage for switch D during boost operation. |
| BST1 (Pin 16) | SW1 Gate Drive Bootstrap | Connected to SW1 via 0.1 µF capacitor; generates floating high-side gate voltage for switch A during buck operation. |
| PVIN (Pin 17) | Main Power Input | Primary input for power switches; bypassed with ≥4.7 µF capacitor; bulk capacitance (47–100 µF) recommended for long leads/high-ESR sources. |
| SW1 (Pin 18) | Buck-Boost Power Switch Node | Connects to other end of inductor; drives input during buck phase; shares same inductor as SW2 - critical for continuous conduction mode. |
| PWM/SYNC (Pin 19) | Mode Control & Clock Sync Input | High = PWM mode; Low = Burst Mode; external clock (100 kHz–2 MHz) synchronizes switching - eliminates beat frequencies in multi-rail systems. |
Key Features
| Feature | Design Value |
|---|---|
| Four-switch synchronous architecture | Enables true buck-boost operation without polarity reversal or external diodes - eliminates conduction losses and improves light-load efficiency. |
| Seamless mode transitions | Proprietary control algorithm prevents output glitches or subharmonic oscillation when crossing VIN = VOUT, critical for stable MCU/sensor power during cold-crank or load-dump events. |
| Programmable input UVLO with hysteresis | Configurable turn-on threshold (e.g., 9 V ±100 mV) avoids brown-out resets in automotive start-stop systems where battery dips to 6 V. |
| Internal soft-start (9 ms) | Prevents inrush current into output capacitors - protects upstream fuses and reduces stress on input bulk caps in high-capacitance applications. |
| Output disconnect in shutdown | Isolates VOUT from VIN during disable, preventing backfeed into powered-down subsystems - essential for functional safety compliance. |
| AEC-Q100 Grade MP qualification | Validated for –55°C to +150°C operation with extended reliability testing - meets requirements for engine control units, ADAS domain controllers, and industrial PLCs. |
Applications
| Automotive Start-Stop Systems | Industrial 24 V Power Distribution |
|---|---|
|
Use Scenario: Powers infotainment head units and body control modules during engine cranking, where battery voltage drops to 6 V for 100 ms. IC Role / Device Role / Timing Role: Buck-boost regulator maintaining stable 5 V/3.3 V output despite rapid VIN transients <1 ms. Use Value: Eliminates need for separate boost stage; sustains operation through cold-crank without reset or data loss. |
Use Scenario: Supplies 12 V rail to I/O modules in factory automation cabinets fed from unregulated 24 V DC bus with ±20% ripple. IC Role / Device Role / Timing Role: Wide-input buck-boost converter regulating against line variations and load steps. Use Value: Replaces linear regulators and discrete buck/boost combos - reduces board area by 40% and thermal footprint by 65%. |
| FireWire-Compatible Power Adapter | Multi-Source Backup Power System |
|
Use Scenario: Generates regulated 5 V/1.5 A from FireWire port (VIN = 28–40 V) for portable test equipment. IC Role / Device Role / Timing Role: High-voltage buck-boost converter operating in step-down mode with precise VOUT accuracy (±1%). Use Value: Meets IEEE 1394 power spec without external pre-regulator; supports hot-plug insertion with no output sag. |
Use Scenario: Powers telemetry gateway using solar, USB, and Li-ion battery inputs - automatically selects optimal source. IC Role / Device Role / Timing Role: Single-chip interface accepting 2.7–40 V inputs and delivering consistent 3.3 V output regardless of source. Use Value: Reduces BOM count by 7 components vs. discrete solution; enables seamless source handover with <50 µs interruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3115IFE-2#PBF | Same silicon, –40°C to +125°C temp range, non-automotive grade. | Not AEC-Q100 qualified; unsuitable for under-hood use but lower cost for industrial controls. | Select when extended temperature range is not required and cost sensitivity outweighs automotive qualification. |
| MAX20406AATG+T | 36 V max input, 3.5 A output, integrated FETs, but only 125°C max junction temperature. | Lacks –55°C low-temp rating and AEC-Q100 MP grade; no programmable UVLO or reverse current limit. | Consider for space-constrained designs needing higher current, but verify thermal derating and qualification requirements. |
Compared with LTC3115IFE-2#PBF and MAX20406AATG+T, the LTC3115MPFE-2#PBF uniquely delivers –55°C operation, AEC-Q100 MP qualification, and full 40 V input support - making it the only option qualified for mission-critical automotive and aerospace power conversion where extreme environmental resilience is mandatory.
Availability
LTC3115MPFE-2#PBF is available at Aetrix Electronics and suitable for automotive power systems, industrial 24 V distribution, FireWire-compatible adapters, and multi-source backup power systems requiring stable component supply across extended temperature and high-reliability environments.
Supply support for LTC3115MPFE-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 precision instrumentation, industrial automation, communications, and automotive markets.
The LTC3115MPFE-2#PBF belongs to the LTC® high-voltage buck-boost converter family, designed specifically for demanding power applications subject to fast input transients, wide input ranges, and extended temperature operation - especially in automotive and industrial settings.
FAQ
What is the maximum input voltage rating for the LTC3115MPFE-2#PBF?
The LTC3115MPFE-2#PBF has an absolute maximum input voltage rating of 45 V on VIN, PVIN, and PVOUT pins. Its operational input voltage range is specified from 2.7 V to 40 V - making it suitable for 24 V/28 V industrial rails and automotive systems with load-dump transients. Exceeding 45 V risks permanent damage per Absolute Maximum Ratings.
Does the LTC3115MPFE-2#PBF support synchronization to an external clock?
Yes, the LTC3115MPFE-2#PBF supports external clock synchronization via the PWM/SYNC pin. When driven with a clean TTL/CMOS clock signal between 100 kHz and 2 MHz, the device locks its switching frequency and phase to the external source - eliminating beat frequencies in multi-converter systems and simplifying EMI filtering.
What is the purpose of the BST1 and BST2 pins on the LTC3115MPFE-2#PBF?
The BST1 and BST2 pins on the LTC3115MPFE-2#PBF provide bootstrap gate drive voltages for the high-side N-channel MOSFETs (Switch A and Switch D). Each connects to its respective switch node (SW1 or SW2) through a 0.1 µF ceramic capacitor, enabling efficient high-side drive without external charge pumps - critical for maintaining efficiency in buck and boost modes.
How does the RUN pin function on the LTC3115MPFE-2#PBF?
The RUN pin on the LTC3115MPFE-2#PBF serves dual functions: enabling/disabling the IC and setting custom input undervoltage lockout (UVLO). It triggers enable at ~1.21 V and sources 0.5 µA for hysteresis. A resistor divider from VIN to GND allows precise UVLO threshold programming - e.g., 9 V turn-on for automotive battery monitoring.
Is the LTC3115MPFE-2#PBF pin-compatible with other variants in the LTC3115-2 family?
Yes, the LTC3115MPFE-2#PBF shares identical pinout and footprint with all FE-package variants (e.g., LTC3115EFE-2#PBF, LTC3115IFE-2#PBF, LTC3115HFE-2#PBF), including the 20-lead TSSOP layout and exposed PGND pad. This enables drop-in replacement across temperature grades without PCB redesign - provided thermal and qualification requirements align.
LTC3115MPFE-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:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP-EP
LTC3115MPFE-2#PBF FAQ
1.How can I place an order for LTC3115MPFE-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3115MPFE-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 LTC3115MPFE-2#PBF reliable?
The price and inventory of LTC3115MPFE-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 LTC3115MPFE-2#PBF is usually 5 days.
3.What payment methods are accepted for LTC3115MPFE-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3115MPFE-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3115MPFE-2#PBF?
LTC3115MPFE-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3115MPFE-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 LTC3115MPFE-2#PBF?
For technical support, including LTC3115MPFE-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3115MPFE-2#PBF requirements.
6.How does Aetrix verify that LTC3115MPFE-2#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3115MPFE-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 LTC3115MPFE-2#PBF meets industry standards.
7.What is the process for return or replacement of LTC3115MPFE-2#PBF?
All LTC3115MPFE-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3115MPFE-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 LTC3115MPFE-2#PBF part is unused and in its original packaging.
Return procedure for LTC3115MPFE-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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