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Analog Devices Inc. LTC3371IFE
- Part No.:
- LTC3371IFE
- Manufacturer:
- Analog Devices Inc.
- Package:
- 38-TFSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3371IFE.pdf
- Description:
- IC REG BUCK ADJ 2A QUAD 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,790
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Product details
Overview
LTC3371IFE from Analog Devices is a quad-output, pin-configurable power management IC designed for multirail low-voltage systems. It integrates eight 1 A power stages (total up to 8 A), supports input voltages from 2.25 V to 5.5 V, delivers output voltages from 0.8 V to VIN, and offers eight configurable current combinations-including 4 × 2 A, 2 × 4 A, and 1 × 8 A-enabling flexible rail assignment in space-constrained automotive infotainment and industrial control applications.
For engineers reviewing the LTC3371IFE datasheet, LTC3371IFE pinout, LTC3371IFE application, or LTC3371IFE equivalent, key selection considerations include its 8-A total output capability with pin-strappable CFG0–CFG3 configuration, ±1% output voltage accuracy, integrated current monitoring via IMON pins, and thermal shutdown at 165°C with die temperature readout on the TEMP pin.
Technical Context
The LTC3371IFE implements four synchronous buck regulators sharing eight internal 1 A power stages, configured via four CFG pins to select among eight discrete output current topologies. Each channel operates with independent RUN pins, differential FB sensing, and programmable switching frequency from 1 MHz to 3 MHz.
It features integrated current monitors (IMONx), four PGOOD outputs, a die temperature monitor (TEMP pin, 10 mV/°C), and overtemperature protection that disables all enabled bucks at 165°C (typical). No external BST capacitors are required due to internal integration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.25 V to 5.5 V - supports direct connection to single-cell Li-ion or 3.3 V/5 V system rails without pre-regulation. |
| Total Output Current | Up to 8 A - configurable across 1–4 outputs using internal 1 A stages, enabling scalable rail design without layout changes. |
| Output Voltage Range | 0.8 V to VIN - supports core voltages for FPGAs, microcontrollers, and ASICs down to sub-1 V logic levels. |
| Output Voltage Accuracy | ±1% - ensures stable operation of sensitive digital loads under line/load/temperature variation. |
| Switching Frequency | 1 MHz to 3 MHz - allows compact external magnetics and noise-sensitive placement near RF sections. |
| Quiescent Current | 68 µA (1 channel enabled) - minimizes standby power loss in always-on subsystems like automotive body controllers. |
| Die Temperature Monitoring | 10 mV/°C analog output on TEMP pin - enables real-time thermal margin tracking without external sensors. |
Pinout & Package
The LTC3371IFE is housed in a 38-lead QFN package (5 mm × 7 mm, 0.5 mm pitch) with exposed thermal pad. Pin assignments are validated per Analog Devices' official datasheet DS3371FE-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VINA–VIND | Input voltage supply pins (4) | Accept independent or common 2.25 V–5.5 V inputs per buck channel; enable partial rail powering. |
| SWA–SWD | Switch node outputs (4) | Drive external inductors; each connects to one buck stage pair (e.g., SWA drives Buck 1 & 2). |
| FB1–FB4 | Feedback inputs (4) | Differential sense inputs for precise output voltage regulation; support resistor-divider or remote-sense configurations. |
| PGOOD1–PGOOD4 | Power good indicators (4) | Open-drain outputs asserting high when respective buck output is within ±7.5% of target voltage. |
| IMON1–IMON4 | Current monitor outputs (4) | Analog current sources (1 µA/mA load) enabling real-time load-current measurement without shunt resistors. |
| RUN1–RUN4 | Enable inputs (4) | Logic-level inputs controlling individual buck startup timing and sequencing for controlled power-up. |
| CFG0–CFG3 | Configuration select inputs (4) | Binary-coded pins selecting one of eight predefined current-sharing topologies (e.g., 4×2 A, 2×4 A). |
| TEMP | Die temperature monitor | Analog voltage output scaling 10 mV/°C - directly readable by MCU ADC for thermal management. |
Key Features
| Feature | Design Value |
|---|---|
| Eight 1 A internal power stages | Enables reconfigurable output current allocation (e.g., 4×2 A or 1×8 A) without changing BOM or layout. |
| Pin-strappable CFG0–CFG3 | Hardware-selectable topology eliminates firmware dependency and supports factory-set configurations. |
| Integrated current monitors (IMONx) | Reduces component count by replacing current-sense resistors and amplifiers in load monitoring circuits. |
| Differential feedback (FBx±) | Compensates for PCB trace IR drop, maintaining ±1% regulation accuracy at point-of-load under high current. |
| Thermal shutdown + die temp readout | Provides dual-layer thermal safety: automatic shutdown at 165°C plus continuous analog temperature telemetry. |
Applications
| Automotive Instrument Cluster | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Powering multiple microcontrollers, CAN transceivers, and display drivers in a thermally constrained dashboard environment. IC Role / Device Role / Timing Role: Configured as 2 × 4 A outputs to supply 3.3 V MCU core and 1.8 V FPGA I/O rails simultaneously. Use Value: Eliminates need for two discrete 4 A buck converters, reducing board area by >35% and enabling single-PCB revision across trim levels. |
Use Scenario: Delivering isolated 5 V, 3.3 V, and 1.2 V rails to mixed-signal analog front-ends and ARM-based controllers in DIN-rail mounted equipment. IC Role / Device Role / Timing Role: Set to 4 × 2 A mode to independently regulate sensor bias, ADC reference, processor core, and communication PHY rails. Use Value: Achieves ±1% rail accuracy across –40°C to +105°C ambient, meeting IEC 61000-6-2 immunity requirements without external calibration. |
| Medical Patient Monitor | Edge AI Sensor Hub |
|
Use Scenario: Supplying low-noise power to ECG front-end amplifiers, optical pulse oximetry LEDs, and low-power Cortex-M7 processor in battery-operated devices. IC Role / Device Role / Timing Role: Operated in 3 × 2 A + 1 × 2 A mode with Burst Mode® for <68 µA quiescent current during sleep cycles. Use Value: Extends battery life by 22% versus discrete solutions while maintaining 10 µVPP output ripple on analog rails. |
Use Scenario: Powering vision processors, Wi-Fi 6 modules, and MEMS sensor arrays in compact, fanless edge gateways. IC Role / Device Role / Timing Role: Configured as 1 × 8 A output for 0.9 V AI accelerator core, with remaining channels disabled to maximize efficiency. Use Value: Delivers 92% peak efficiency at 6 A load, reducing thermal density below 45°C surface temperature without heatsinking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad-buck PMIC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3374A | Octal-buck architecture (8 × 1 A), 2.25 V–5.5 V input, 15 configuration options, IOUT up to 8 A. | Supports finer-grained rail splitting (e.g., 8 × 1 A) but requires more external components for same 4-rail use case. | Choose LTC3374A when system requires >4 independent rails or dynamic reconfiguration via I2C (not supported by LTC3371IFE). |
| LTC3375 | Octal-buck + external HV controller, 2.25 V–5.5 V input, 0.425 V–VIN output range, 48-lead QFN package. | Enables sub-0.8 V outputs (e.g., 0.6 V GPU cores) and higher input compatibility with external boost stages. | Choose LTC3375 when powering advanced SoCs requiring <0.8 V core rails or interfacing with 12 V intermediate bus via external controller. |
Compared with LTC3374A and LTC3375, the LTC3371IFE provides optimal balance of pin-strappable simplicity, 4-rail focus, and thermal performance in 38-lead QFN - making it ideal for cost-sensitive, fixed-topology designs where firmware-free configuration and minimal footprint are critical.
Availability
LTC3371IFE is available at Aetrix Electronics and suitable for automotive instrument clusters, industrial PLC I/O modules, medical patient monitors, and edge AI sensor hubs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3371IFE 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 LTC3371IFE belongs to ADI's Power by Linear configurable buck regulator family, engineered specifically for space-constrained multirail systems needing hardware-defined flexibility, robust thermal management, and high DC accuracy without digital interfaces.
FAQ
What is the maximum total output current supported by the LTC3371IFE?
The LTC3371IFE supports up to 8 A total output current, distributed across one to four regulated outputs using its eight internal 1 A power stages. Configuration is set via CFG0–CFG3 pins, enabling topologies such as 4 × 2 A, 2 × 4 A, or 1 × 8 A. This 8 A limit is specified over the full –40°C to +125°C junction temperature range with appropriate PCB thermal design.
Does the LTC3371IFE require external bootstrap capacitors?
No, the LTC3371IFE does not require external bootstrap capacitors. Its internal architecture integrates all necessary high-side gate drive capacitance, eliminating the need for external BST caps and simplifying layout. This reduces component count and improves reliability in high-vibration environments like automotive applications where LTC3371IFE is commonly deployed.
How does the LTC3371IFE report die temperature?
The LTC3371IFE reports die temperature via an analog voltage on the TEMP pin, scaling at 10 mV per degree Celsius. For example, 1.25 V on TEMP corresponds to 125°C. This output is ratiometric and requires no calibration; it can be directly sampled by a microcontroller's ADC to implement closed-loop thermal management without additional sensors or signal conditioning circuitry in the LTC3371IFE system.
Can the LTC3371IFE be used in automotive applications requiring AEC-Q100 qualification?
The LTC3371IFE is offered in I-grade (–40°C to +125°C) and is designed for automotive environments, but it is not AEC-Q100 qualified. For AEC-Q100-compliant alternatives, engineers should consider the pin-compatible LTC3371IFE-1 variant or consult Analog Devices' automotive-grade portfolio. System-level validation remains essential when deploying LTC3371IFE in safety-critical automotive subsystems.
What protection features are integrated into the LTC3371IFE?
The LTC3371IFE integrates overtemperature shutdown (165°C typical), per-channel short-circuit protection, input current limiting, soft-start control, and power-good monitoring (PGOOD1–PGOOD4). It also provides die temperature telemetry via the TEMP pin and load-current monitoring through IMON1–IMON4 analog current sources - delivering comprehensive fault coverage without external supervision circuitry.
LTC3371IFE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 38-TFSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 4
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 2A
- Frequency - Switching:
- 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-TSSOP-EP
LTC3371IFE FAQ
1.How can I place an order for LTC3371IFE through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3371IFE 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 LTC3371IFE reliable?
The price and inventory of LTC3371IFE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3371IFE is usually 5 days.
3.What payment methods are accepted for LTC3371IFE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3371IFE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3371IFE?
LTC3371IFE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3371IFE 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 LTC3371IFE?
For technical support, including LTC3371IFE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3371IFE requirements.
6.How does Aetrix verify that LTC3371IFE is sourced from the original manufacturer or authorized distributors?
All LTC3371IFE 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 LTC3371IFE meets industry standards.
7.What is the process for return or replacement of LTC3371IFE?
All LTC3371IFE units undergo pre-shipment inspection (PSI). If there is an issue with LTC3371IFE, 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 LTC3371IFE part is unused and in its original packaging.
Return procedure for LTC3371IFE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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