My Inquiry
My Account
Analog Devices Inc. LTC3115IFE-2#PBF
- Part No.:
- LTC3115IFE-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3115IFE-2#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:133
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3115IFE-2#PBF from Analog Devices is a 40V, 2A monolithic synchronous buck-boost DC/DC converter optimized for fast input transients (<1ms), supporting 2.7V–40V input and output ranges, programmable 100kHz–2MHz switching frequency, and AEC-Q100 qualification for automotive power systems.
For engineers reviewing the LTC3115IFE-2#PBF datasheet, LTC3115IFE-2#PBF pinout, LTC3115IFE-2#PBF application, or LTC3115IFE-2#PBF equivalent, key selection criteria include input transient robustness, wide VIN/VOUT compatibility, burst-mode quiescent current (30µA), thermal performance in TSSOP package, and synchronization capability up to 2MHz.
Technical Context
The LTC3115IFE-2#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 integrated VCC linear regulator (4.45V output, 50–110mA current limit). It supports both PWM and Burst Mode operation via the PWM/SYNC pin.
Its dual-mode operation enables high efficiency across load conditions: up to 95% in PWM mode at full load and 30µA no-load quiescent current in Burst Mode. The device features programmable input UVLO (2.7V threshold), internal soft-start (9ms), and reverse inductor current limiting (−1.5A) for bidirectional protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 40V - supports lead-acid battery, industrial 24V/28V, and unregulated wall adapters without external pre-regulation. |
| Output Voltage Range | 2.7V to 40V - enables single-rail regulation across varying source and load requirements, e.g., FireWire or multi-source supplies. |
| Max Output Current | 2A in step-down mode (VIN ≥ 6V) - delivers full rated current when input exceeds output, critical for high-power automotive loads. |
| Switching Frequency | 100kHz to 2MHz - adjustable via RT resistor; higher frequencies enable smaller inductors (e.g., 5.2µH at 2MHz) for space-constrained designs. |
| Quiescent Current | 30µA in Burst Mode - extends battery life in always-on automotive telematics or sensor nodes with intermittent activity. |
| Shutdown Current | 3µA - ensures minimal drain during system sleep states, meeting stringent OEM low-power requirements. |
| Thermal Rating | −40°C to +125°C junction - validated for under-hood automotive environments and industrial control cabinets. |
Pinout & Package
Package: 20-lead plastic TSSOP (FE), thermally enhanced with exposed PGND pad (Pin 21) requiring soldering to PCB ground plane for θJA = 38°C/W performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN (Pin 2) | Enable/UVLO control input | Enables IC when >1.21V; sourcing 0.5µA hysteresis current allows precise resistor-divider-set UVLO thresholds (e.g., 24V system cutoff). |
| SW2 (Pin 3) | Buck-boost power switch node | Connects to one end of inductor; drives output-side switch (D); requires 0.1µF BST2 capacitor to PVOUT for gate drive. |
| PVOUT (Pin 4) | Power output rail | High-current output connection; must use ≥10µF low-ESR capacitor placed adjacent to IC; Schottky diode recommended for VOUT >20V short-circuit protection. |
| GND (Pins 5,6) | Signal ground reference | Low-noise return path for feedback, error amplifier, and oscillator circuits; separate from PGND to minimize noise coupling. |
| VC (Pin 7) | Error amplifier output | Compensation node requiring RC network to FB for loop stability; directly affects transient response and phase margin. |
| FB (Pin 8) | Feedback voltage sense | Sets output voltage via resistor divider; nominal 1000mV reference enables accurate VOUT programming (e.g., 5V, 12V, 24V). |
| RT (Pin 9) | Oscillator frequency set | Resistor to ground determines switching frequency (e.g., 35.7kΩ → 1MHz); enables optimization of efficiency vs. size trade-off. |
| VCC (Pin 12) | Internal logic supply | Must be tied directly to PVCC; powers control circuitry; requires ≥4.7µF bypass capacitor for stable operation under dynamic load. |
| VIN (Pin 13) | VCC regulator input | Supplies internal LDO generating VCC; senses input for UVLO; requires 0.1µF local bypass to suppress high-frequency noise. |
| PVCC (Pin 14) | VCC regulator output | Provides gate drive voltage for all four internal switches; shared with VCC; requires low-impedance connection to minimize shoot-through risk. |
| BST2 (Pin 15) | SW2 gate drive bootstrap | Connected to SW2 via 0.1µF capacitor; generates floating rail for high-side switch D; critical for boost-mode efficiency. |
| BST1 (Pin 16) | SW1 gate drive bootstrap | Connected to SW1 via 0.1µF capacitor; generates floating rail for high-side switch A; enables buck-mode conduction. |
| PVIN (Pin 17) | Main power input | High-current input node; requires ≥4.7µF ceramic + optional 47–100µF bulk capacitor to damp input ripple and prevent instability in boost mode. |
| SW1 (Pin 18) | Buck-boost power switch node | Connects to other end of inductor; drives input-side switch (A); requires 0.1µF BST1 capacitor to PVIN for gate drive. |
| PWM/SYNC (Pin 19) | Mode control & sync input | High = fixed-frequency PWM; low = Burst Mode; external clock = synchronization; logic threshold 0.5–1.5V; max 5.5V rating. |
| PGND (Pins 1,10,11,20,21) | Power ground return | Exposes thermal pad (Pin 21) as primary PGND; must be soldered to large copper area for thermal dissipation and low-impedance return path. |
Key Features
| Feature | Design Value |
|---|---|
| Four-switch synchronous architecture | Eliminates need for external MOSFETs and gate drivers; reduces BOM count and layout complexity while enabling true buck-boost operation. |
| Seamless mode transition algorithm | Prevents output voltage glitches and subharmonic oscillation when VIN crosses VOUT - essential for stable power in automotive start-stop cycles. |
| Programmable input undervoltage lockout | Configurable via RUN pin divider; protects downstream circuitry from brownout conditions in 12V/24V vehicle electrical systems. |
| Internal soft-start (9ms) | Controls inrush current during power-up; prevents input capacitor stress and avoids triggering upstream current-limit protection. |
| Reverse inductor current limit (−1.5A) | Prevents destructive reverse current flow during output short-circuit or heavy load dump events in automotive applications. |
| AEC-Q100 qualified (Grade I) | Validated for −40°C to +125°C operation with extended reliability testing - meets OEM requirements for engine control and ADAS modules. |
Applications
| Automotive Start-Stop Systems | Industrial 24V/28V Power Supplies |
|---|---|
Use Scenario: Regulating stable 5V/12V from vehicle battery during cranking (VIN drops to 3.6V) and alternator overvoltage (VIN spikes to 40V). IC Role / Device Role / Timing Role: Primary buck-boost regulator maintaining constant output despite rapid input transients (<1ms). Use Value: Prevents ECU reset during cold cranking; eliminates need for separate pre-regulator or backup capacitor bank. |
Use Scenario: Powering PLC I/O modules from unregulated 24V industrial bus subject to line surges and brownouts. IC Role / Device Role / Timing Role: Wide-input DC/DC converter delivering regulated 3.3V/5V with high PSRR and fast transient response. Use Value: Enables direct connection to factory power rails without external filtering; reduces system footprint and cost. |
| FireWire® Power Delivery | Multi-Source Backup Power Systems |
Use Scenario: Providing compliant 12V/30W power from IEEE 1394 FireWire port with variable input (8–40V) and strict ripple limits. IC Role / Device Role / Timing Role: Synchronous buck-boost controller meeting FireWire spec for voltage accuracy and noise emission. Use Value: Achieves >90% efficiency at full load while staying within conducted EMI limits; replaces discrete solutions requiring complex compensation. |
Use Scenario: Seamless switchover between USB-C (5V), PoE (48V), and Li-ion battery (3.0–4.2V) inputs to maintain 12V system rail. IC Role / Device Role / Timing Role: Single-chip wide-VIN regulator eliminating need for multiple converters or OR-ing controllers. Use Value: Reduces bill-of-materials by 60%; enables compact portable test equipment with flexible power options. |
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 peak current (4A), wider freq range (100kHz–2MHz), but no integrated VCC LDO; requires external bias supply. | Better suited for high-current industrial motor drives; lacks AEC-Q100 qualification and burst-mode ultra-low IQ. | Select when >2A continuous output or >40V input is required; avoid for battery-powered automotive modules needing <30µA standby. |
| TPS63070DDAR | Lower voltage rating (16V max VIN/VOUT), lower IQ in PFET mode (20µA), but no synchronization or programmable UVLO. | Ideal for portable medical devices; not rated for automotive temperature or transient immunity. | Choose for cost-sensitive consumer electronics with ≤12V rails; reject for automotive or industrial 24V+ systems requiring robustness. |
Compared with LT8390A and TPS63070, the LTC3115IFE-2#PBF uniquely combines AEC-Q100 qualification, 40V rating, 3µA shutdown, and seamless mode transitions - making it the only option qualified for under-hood automotive buck-boost regulation with transient immunity.
Availability
LTC3115IFE-2#PBF is available at Aetrix Electronics and suitable for automotive power systems, industrial 24V/28V supplies, and FireWire regulator applications requiring stable component supply, long-term lifecycle support, and AEC-Q100 compliance.
Supply support for LTC3115IFE-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 automotive, industrial, communications, and healthcare markets.
The LTC3115-2 product line was designed specifically for high-reliability automotive and industrial power conversion where input voltage transients, wide operating ranges, and low quiescent current are critical - exemplified by the LTC3115IFE-2#PBF's AEC-Q100 Grade I rating and 2.7V–40V operation.
FAQ
What is the maximum output current capability of the LTC3115IFE-2#PBF in buck versus boost configuration?
The LTC3115IFE-2#PBF delivers 2A continuous output current in step-down (buck) mode when VIN ≥ 6V and VOUT = 5V. In boost mode, output current is limited by inductor saturation and thermal constraints; typical capability is 0.8A at VIN = 3.6V, VOUT = 5V. The device's 4-switch architecture maintains consistent performance across both modes without external component changes, and its 150mΩ internal MOSFETs minimize conduction losses in either direction.
Does the LTC3115IFE-2#PBF require external MOSFETs or gate drivers?
No, the LTC3115IFE-2#PBF integrates four N-channel DMOS power switches (150mΩ each), internal high-side gate drivers, and a VCC linear regulator - eliminating the need for external MOSFETs, driver ICs, or bootstrap diodes. Only two 0.1µF BST capacitors (BST1→SW1, BST2→SW2), input/output capacitors, an inductor, and the RT programming resistor are required for basic operation.
How does the LTC3115IFE-2#PBF handle input voltage transients below 2.7V or above 40V?
The LTC3115IFE-2#PBF has absolute maximum ratings of −0.3V to 45V on VIN/PVIN/PVOUT pins, but guaranteed operation is specified only from 2.7V to 40V. Below 2.7V, the device enters undervoltage lockout (UVLO) and shuts down; above 40V, permanent damage may occur. For transient suppression beyond these limits, external TVS diodes or clamping circuits must be added per Analog Devices' application notes (e.g., AN147).
Can the LTC3115IFE-2#PBF synchronize to an external clock, and what are the timing requirements?
Yes, the LTC3115IFE-2#PBF synchronizes to an external clock applied to the PWM/SYNC pin. The clock must have a frequency between 100kHz and 2MHz, with minimum pulse width (high or low) of 100ns and logic levels within 0.5V–1.5V for recognition. The device locks to the external clock within microseconds and maintains phase coherence - critical for reducing EMI in multi-rail systems.
What thermal design considerations apply to the LTC3115IFE-2#PBF in its 20-lead TSSOP package?
The LTC3115IFE-2#PBF's 20-lead TSSOP (FE) package has θJA = 38°C/W and requires soldering of the exposed PGND pad (Pin 21) to a minimum 200mm² copper area for rated thermal performance. Without proper pad connection, junction temperature rise can exceed limits under 2A load. Analog Devices recommends using thermal vias under the pad and minimizing trace length to ground planes to achieve ≤125°C junction temperature at full load.
LTC3115IFE-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
LTC3115IFE-2#PBF FAQ
1.How can I place an order for LTC3115IFE-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3115IFE-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 LTC3115IFE-2#PBF reliable?
The price and inventory of LTC3115IFE-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 LTC3115IFE-2#PBF is usually 5 days.
3.What payment methods are accepted for LTC3115IFE-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3115IFE-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3115IFE-2#PBF?
LTC3115IFE-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3115IFE-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 LTC3115IFE-2#PBF?
For technical support, including LTC3115IFE-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3115IFE-2#PBF requirements.
6.How does Aetrix verify that LTC3115IFE-2#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3115IFE-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 LTC3115IFE-2#PBF meets industry standards.
7.What is the process for return or replacement of LTC3115IFE-2#PBF?
All LTC3115IFE-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3115IFE-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 LTC3115IFE-2#PBF part is unused and in its original packaging.
Return procedure for LTC3115IFE-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3115IFE-2#PBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
