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Analog Devices Inc. LTC3371IUHF#TRPBF
- Part No.:
- LTC3371IUHF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC3371IUHF#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 2A QUAD 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,587
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Product details
Overview
LTC3371IUHF#TRPBF from Analog Devices (formerly Linear Technology) is a configurable 4-channel synchronous buck DC/DC power supply IC with integrated 8×1A power stages, watchdog timer, and power-on reset. It supports independent 2.25V–5.5V inputs per channel, pin-programmable output configurations (1–4A per channel), and operates from –40°C to 125°C. Used in automotive infotainment and industrial control systems requiring flexible, low-noise multirail power.
For engineers reviewing the LTC3371IUHF#TRPBF datasheet, LTC3371IUHF#TRPBF pinout, LTC3371IUHF#TRPBF application, or LTC3371IUHF#TRPBF equivalent, key selection criteria include programmable current-stage allocation, CT-pin-timed RST/WD functions, precision enable thresholds for autonomous sequencing, and thermal monitoring capability in the 38-lead 5mm × 7mm QFN package.
Technical Context
The LTC3371IUHF#TRPBF implements eight discrete 1A synchronous buck power stages that can be grouped into 1–4 output channels via C1–C3 logic pins. Each channel uses independent VIN supplies and shares a common switching frequency set by RT resistor, internal 2MHz oscillator, or external PLL sync.
Its CT pin configures timing for four independent open-drain RST outputs (±5% regulation fault detection), WDO timeout (202ms low pulse), and watchdog windowing (1.62s WDI window). Burst Mode® operation enables ultra-low quiescent current (68µA for one active channel), while phased 90° switching reduces input ripple.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.25V to 5.5V per buck stage - supports diverse rail sources including battery-backed and regulated supplies. |
| Configurable Output Current | 1A to 4A per channel - achieved by combining 1–4 of eight 1A stages, enabling flexible load-matching without redesign. |
| Switching Frequency | 1MHz to 3MHz (RT-programmable) or 2MHz default - allows optimization of size vs. efficiency and EMI performance. |
| Quiescent Current | 68µA (1 channel active, Burst Mode®) - extends battery life in always-on subsystems like automotive body controllers. |
| Enable Threshold Accuracy | ±20mV at 400–1200mV rising threshold - ensures precise, repeatable power sequencing across temperature. |
| Watchdog Timeout | 1.62s WDI window, 202ms WDO pulse (CT = 10nF) - provides deterministic system-level fault recovery timing. |
| Die Temperature Monitoring | Linear 7mV/°C slope from 180mV at 25°C - enables real-time thermal margining and overtemperature shutdown at 170°C. |
Pinout & Package
The LTC3371IUHF#TRPBF is housed in a thermally enhanced 38-lead 5mm × 7mm QFN package with exposed pad (Pin 39 = GND). Pin assignment is identical for QFN (UHF) and TSSOP (FE) packages per datasheet Figure 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VINA–VINH | Independent Buck Input Supplies | Eight dedicated 2.25V–5.5V inputs - enable true distributed power architecture with local decoupling. |
| SWA–SWH | Buck Switch Nodes | Eight high-efficiency switch nodes - connect directly to external inductors; support phase interleaving for reduced input ripple. |
| FB1–FB4 | Output Voltage Feedback Inputs | Four precision 0.8V reference inputs - allow accurate regulation of 1.2V–5V outputs using standard resistor dividers. |
| EN1–EN4 | Channel Enable Inputs | Active-high digital enables with hysteresis - support autonomous sequencing via voltage-rail dependencies. |
| RST1–RST4 | Open-Drain Power-Good Outputs | Assert low when output drops >5% - provide hardware-level fault signaling to microcontrollers or FPGAs. |
| C1–C3 | Configuration Control Bits | Three logic inputs defining 8 possible channel configurations - eliminate firmware dependency for hardware-defined power maps. |
| CT | Timing Capacitor Input | Sets watchdog/RST timing constants - single capacitor scales all timing functions, simplifying BOM and layout. |
| WDI/WDO | Watchdog Interface Pins | Edge-triggered input and open-drain timeout output - enable fail-safe system recovery without software intervention. |
Key Features
| Feature | Design Value |
|---|---|
| 8×1A Configurable Buck Stages | Hardware-selectable combinations (e.g., 4×2A, 2×4A, 1×3A+1×1A) - eliminates need for multiple fixed-output PMICs. |
| Phased 90° Switching | Reduces peak input current by up to 40% vs. synchronous switching - lowers required input capacitance and EMI filter size. |
| Precision Enable Thresholds | 400–1200mV rising threshold with ±20mV tolerance - enables robust power-up sequencing across voltage tolerances and temperature. |
| Integrated Temperature Sensor | Monitors die temperature with ±3°C accuracy and 7mV/°C linearity - replaces external thermal sensors in space-constrained designs. |
| Low-Noise Burst Mode® | 68µA IQ with 20mVpp output ripple - maintains regulation during ultra-low-load conditions without audible noise or RF interference. |
Applications
| Automotive Infotainment | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Powering multi-core SoC, DDR memory, and display interface in head-unit systems with strict EMC and thermal limits. IC Role / Device Role / Timing Role: Primary multirail power manager delivering 1.1V/1.8V/3.3V/5V rails with independent enable sequencing and watchdog supervision. Use Value: Reduces board area by consolidating eight discrete regulators; phased switching meets CISPR-25 Class 5 conducted emissions requirements. | Use Scenario: Providing isolated, sequenced 3.3V and 5V rails for FPGA configuration, analog front-end, and communication interfaces in modular I/O cards. IC Role / Device Role / Timing Role: Centralized power controller with RST outputs tied to FPGA INIT_B and watchdog-linked to safety MCU. Use Value: Enables deterministic power-up timing and automatic system reset on rail fault - critical for SIL-2 functional safety compliance. |
| Medical Imaging Sensors | Test & Measurement Equipment |
Use Scenario: Supplying low-noise bias voltages to high-resolution ADCs and precision op-amps in portable ultrasound transceivers. IC Role / Device Role / Timing Role: Low-ripple, low-IQ power source with Burst Mode® operation during standby and forced continuous mode during acquisition. Use Value: Achieves <10µVrms output noise and 68µA quiescent current - extends battery runtime while preserving signal integrity. | Use Scenario: Generating stable, independently adjustable rails for mixed-signal FPGA-based data acquisition boards operating across –40°C to 85°C ambient. IC Role / Device Role / Timing Role: Temperature-compensated power supervisor with die-temp readback and programmable UVLO thresholds. Use Value: Eliminates external thermal sensor and discrete supervisors - reduces calibration complexity and improves long-term drift stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65218D0RSLR | Fixed 4-channel configuration (3×DCDC + 1×LDO); no programmable stage combining; lower max input (5.5V) and output current (3A). | Targeted at AM335x/AM437x Sitara processors; lacks CT-timed watchdog and independent VIN per stage. | Select when processor-specific integration and lower cost outweigh configurability and thermal monitoring needs. |
| ISL9122AIRZ-T7A | 4-channel buck with dynamic voltage scaling; higher max input (5.5V); no watchdog or RST outputs; only two independent VIN domains. | Optimized for mobile APs with DVFS; missing hardware-configurable current allocation and temperature sensing. | Prefer for battery-powered handheld devices where DVFS and footprint are primary; avoid for industrial watchdog-critical systems. |
Compared with TPS65218D0RSLR and ISL9122AIRZ-T7A, the LTC3371IUHF#TRPBF uniquely combines hardware-configurable current staging, per-stage input independence, CT-programmed timing, and die-temperature monitoring - making it suitable for ruggedized, thermally aware, and safety-monitored embedded systems where flexibility and reliability are non-negotiable.
Availability
LTC3371IUHF#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLC I/O modules, and medical imaging sensors requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3371IUHF#TRPBF 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 acquired Linear Technology in 2017 and maintains its high-performance power management portfolio with rigorous automotive and industrial qualification standards.
The LTC3371IUHF#TRPBF belongs to Linear's configurable multirail PMIC family, designed specifically for space-constrained, thermally demanding applications needing hardware-defined power architectures without firmware dependency.
FAQ
What is the maximum total output current supported by the LTC3371IUHF#TRPBF?
The LTC3371IUHF#TRPBF integrates eight 1A synchronous buck power stages, allowing a maximum total output current of 8A. This is distributed across 1–4 channels via hardware configuration (C1–C3 pins); for example, a 2-channel setup can deliver 4A per rail, while a 4-channel setup delivers up to 2A per rail. The actual achievable current per channel depends on thermal design and PCB copper area.
Does the LTC3371IUHF#TRPBF support synchronization to an external clock?
Yes, the LTC3371IUHF#TRPBF supports external clock synchronization via the PLL/MODE pin. When driven with a clean square wave between 1MHz and 3MHz, the internal oscillators lock to the external source, enabling coherent switching across multiple LTC3371IUHF#TRPBF devices or with other system clocks to reduce beat frequencies and EMI peaks.
How does the CT pin affect the RST and watchdog timing in the LTC3371IUHF#TRPBF?
The CT pin on the LTC3371IUHF#TRPBF sets a master time constant used to scale all timing functions: RST assertion delay (160–240ms), WDO timeout pulse width (160–280ms), and WDI watchdog window (1.30–1.95s). With a 10nF capacitor, nominal values are 202ms (RST), 202ms (WDO), and 1.62s (WDI). Timing scales linearly with capacitance, enabling precise adjustment without changing firmware or logic.
Can the LTC3371IUHF#TRPBF operate with different input voltages on each channel?
Yes, the LTC3371IUHF#TRPBF accepts independent input supplies on VINA–VINH (eight pins), allowing each of the four buck channels to be powered from separate sources - for example, 3.3V for digital rails and 5V for analog sections. Each input must be bypassed with ≥10µF ceramic capacitance, and all inputs share the same 2.25V–5.5V range specification.
What is the purpose of the TEMP pin on the LTC3371IUHF#TRPBF?
The TEMP pin on the LTC3371IUHF#TRPBF provides an analog voltage proportional to die temperature (180mV at 25°C, +7mV/°C slope), enabling real-time thermal monitoring without external sensors. It supports overtemperature shutdown at 170°C and allows system-level thermal throttling or fan control. The output is ratiometric to VCC and calibrated across –40°C to 125°C.
LTC3371IUHF#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 38-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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-QFN (5x7)
LTC3371IUHF#TRPBF FAQ
1.How can I place an order for LTC3371IUHF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3371IUHF#TRPBF 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 LTC3371IUHF#TRPBF reliable?
The price and inventory of LTC3371IUHF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3371IUHF#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3371IUHF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3371IUHF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3371IUHF#TRPBF?
LTC3371IUHF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3371IUHF#TRPBF 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 LTC3371IUHF#TRPBF?
For technical support, including LTC3371IUHF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3371IUHF#TRPBF requirements.
6.How does Aetrix verify that LTC3371IUHF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3371IUHF#TRPBF 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 LTC3371IUHF#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3371IUHF#TRPBF?
All LTC3371IUHF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3371IUHF#TRPBF, 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 LTC3371IUHF#TRPBF part is unused and in its original packaging.
Return procedure for LTC3371IUHF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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