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Analog Devices Inc. LTC3372IUK#PBF
- Part No.:
- LTC3372IUK#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 48-WFQFN Exposed Pad
- Datasheet:
-
LTC3372IUK#PBF.pdf
- Description:
- 60V LOW IQ BUCK CONTROLLER PLUS
- Quantity:
- Payment:
- Shipping:
Inventory:107
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Product details
Overview
LTC3372IUK#PBF from Analog Devices is a highly flexible multioutput power supply IC integrating one 4.5V–60V high-voltage synchronous buck controller and four configurable low-voltage synchronous buck regulators sharing eight 1A integrated power stages. It supports eight output configurations (e.g., 4×2A, 3×2A+1×2A, or 1×4A), delivers precision enable thresholds (±20mV), and achieves ultra-low quiescent current (15µA HV-only at 5VOUT). It is deployed in automotive always-on systems requiring robust sequencing and thermal monitoring.
For engineers reviewing the LTC3372IUK#PBF datasheet, LTC3372IUK#PBF pinout, LTC3372IUK#PBF application, or LTC3372IUK#PBF equivalent, key selection criteria include its 48-pin 7mm × 7mm QFN package, programmable LV output configurations via C1–C3 pins, CT-pin-programmable watchdog/RST timing, die temperature monitoring (TEMP pin), and dual-mode operation (Burst/Forced Continuous) with 1MHz–3MHz LV switching frequency.
Technical Context
The LTC3372IUK#PBF implements a two-tier architecture: a high-voltage (HV) controller driving external N-channel FETs (TG/BG pins) with 60V input capability and 98% max duty cycle, plus four low-voltage (LV) regulators each built from integrated PMOS/NMOS power stages (RPMOS = 290mΩ, RNMOS = 180mΩ). The HV controller operates at 1/6 the LV switching frequency (e.g., 333kHz when LV runs at 2MHz).
LV regulator configuration is determined by C1–C3 logic levels, selecting among eight fixed channel-current combinations (e.g., 000 = 2A/2A/2A/2A; 111 = 4A/–/–/4A). Each LV channel accepts independent inputs (VINA–H = 2.25V–5.5V), enabling mixed-supply designs where some channels are powered from the HV output while others use separate rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| HV Input Range | 4.5V to 60V - supports wide automotive battery and industrial input rails without pre-regulation. |
| HV Output Voltage | 3.3V or 5.0V (programmed via VOUTPRG pin) - precise ±1.25% regulation over line/load/temperature. |
| LV Input Range | 2.25V to 5.5V per channel (VINA–H) - enables flexible sourcing from HV output or auxiliary supplies. |
| LV Output Voltage Range | 0.8V to VINA-H - supports core logic, memory, and I/O rails with 800mV feedback reference (±1% tolerance). |
| Total No-Load IQ | 15µA (HV only, 5VOUT) or 23µA (HV only, 3.3VOUT) - critical for always-on automotive modules. |
| LV Switching Frequency | 1MHz to 3MHz (programmable via RT resistor) - allows optimization of size vs. efficiency for compact PCB layouts. |
| Thermal Shutdown | 170°C with 10°C hysteresis - protects against sustained overload in sealed enclosures. |
| Package | 48-pin 7mm × 7mm QFN with exposed thermal pad - provides θJA = 34°C/W for high-power density designs. |
Pinout & Package
The LTC3372IUK#PBF is housed in a thermally enhanced 48-pin 7mm × 7mm plastic QFN package (UK grade) with exposed GND pad (Pin 49) requiring soldering to PCB for thermal and electrical integrity. Junction temperature rating is –40°C to 125°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | HV input supply | Accepts 4.5V–60V; powers HV controller and internal bias circuitry. |
| TG / BG | HV gate drivers | Drive external high-side and low-side N-channel MOSFETs; 2.3Ω/1.5Ω pull-up, 2.4Ω/1.1Ω pull-down. |
| SW | HV switch node | Connects to external inductor; voltage swings from VIN to near ground during operation. |
| VOUT/EXTVCC | HV regulated output / bias supply | Delivers 3.3V or 5V; also powers internal circuits when >4.5V, else switches to VIN. |
| C1–C3 | LV configuration select | 3-bit logic inputs determining how eight 1A power stages are grouped into 1–4 output channels. |
| VINA–H | LV input supplies (8 pins) | Independent 2.25V–5.5V inputs for each LV power stage group; enables mixed-rail architectures. |
| SWA–SWH | LV switch nodes (8 pins) | Connect to LV inductors; each pair (e.g., SWA/SWB) serves one 1A stage within a configured channel. |
| FB1–FB4 | LV feedback inputs | Monitor regulated outputs; internal 800mV reference enables precise voltage setting with external resistive dividers. |
| EN1–EN4 | LV enable controls | Individual enable pins with 400–1200mV rising threshold; support staggered power-up sequencing. |
| TEMP | Die temperature monitor | Analog output (220mV @ 25°C, +7mV/°C slope); used for system thermal management or fault logging. |
| CT | Watchdog & RST timing | Capacitor-based timing for programmable watchdog timeout (e.g., 12.9s typical with 10nF) and Power-On Reset delay. |
| RST | Power-On Reset output | Open-drain active-low signal asserting after configurable delay when all enabled LV outputs reach regulation. |
Key Features
| Feature | Design Value |
|---|---|
| Configurable LV power stages | Eight 1A integrated power stages reconfigurable into 2A/3A/4A channels via C1–C3 pins - eliminates need for multiple discrete regulators. |
| Ultra-low quiescent current | 15µA HV-only (5VOUT) and 9µA per additional enabled LV channel in Burst Mode - extends battery life in always-on systems. |
| Programmable sequencing & monitoring | Precision enable thresholds (±20mV), CT-pin-programmable RST delay, and die temperature output (TEMP) - enables reliable startup and thermal safety without external components. |
| High-voltage controller flexibility | 4.5V–60V input, 1/6-frequency synchronization, 98% max duty cycle, and external FET drive - supports high-step-down ratios and diverse topologies. |
| Robust protection suite | Overtemperature shutdown (170°C), VOUT UV/OV detection (±5%), SENSE– OV protection, and PGOOD fault reporting - ensures system reliability under fault conditions. |
Applications
| Automotive ADAS Domain Controller | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Powering SoC cores, DDR memory, and sensor interfaces in a 12V-powered ADAS ECU with strict low-IQ requirements. IC Role / Device Role: Primary power manager delivering 1.0V/2A (core), 1.2V/2A (DDR), 2.5V/2A (I/O), and 3.3V/2A (peripherals) from a single 12V rail. Use Value: Configurable LV stages eliminate four discrete buck ICs; 15µA HV-only IQ meets ISO 26262 ASIL-B standby requirements. |
Use Scenario: Generating isolated 3.3V, 5V, and 12V rails for microcontroller, communication transceivers, and analog front-end in a DIN-rail mounted PLC. IC Role / Device Role: Central multi-output regulator supplying VCC for ARM Cortex-M7, RS-485 transceivers, and ADC reference buffers. Use Value: Independent VINA–H inputs allow LV channels to be powered from different sources (e.g., 5V from HV output, 12V from auxiliary supply), simplifying board-level power architecture. |
| Medical Portable Diagnostic Device | Telecom Remote Radio Unit (RRU) |
|
Use Scenario: Battery-powered ultrasound handheld requiring low-noise, sequenced power for FPGA, analog beamformer, and display driver. IC Role / Device Role: Single-chip solution providing 1.8V/4A (FPGA core), 3.3V/2A (I/O), and 5.0V/2A (display backlight) with soft-start control. Use Value: TRACK/SS pin enables controlled ramp-up across all outputs; TEMP pin feeds system thermal management firmware for safe battery discharge limits. |
Use Scenario: Outdoor 4G/5G RRU needing high-efficiency, thermally resilient power conversion from 48V DC supply. IC Role / Device Role: HV controller regulates 5V for digital logic; LV regulators deliver 1.2V/3A (FPGA), 2.5V/2A (RF DAC), and 3.3V/2A (control MCU). Use Value: 60V HV input withstands telecom surge standards; 170°C thermal shutdown prevents field failures in unventilated enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-output power management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2964GQ-Z from Monolithic Power Systems | 4-channel 3A/3A/3A/3A fixed-output PMIC; no HV controller; 2.7V–16V input; no die temperature monitor. | Targets lower-input-voltage applications (e.g., 12V systems only); lacks 60V HV buck and thermal sensing capability. | Select when only low-voltage multi-rail generation is needed and HV step-down is handled externally. |
| TPS6521905RHBR from Texas Instruments | 6-channel PMIC with integrated 3.3V/5V HV buck; 2.7V–5.5V LV inputs; no configurable power-stage grouping; 125°C max junction temp. | Offers more LV channels but fixed 1A per channel; no C1–C3 configurability or 170°C thermal shutdown. | Select when fixed 1A-per-channel distribution suffices and higher channel count outweighs configurability needs. |
Compared with MP2964GQ-Z and TPS6521905RHBR, the LTC3372IUK#PBF uniquely combines 60V HV buck control, eight reconfigurable 1A LV stages, die temperature monitoring, and ultra-low 15µA standby IQ - making it optimal for automotive and industrial systems demanding both high input voltage resilience and flexible, low-power multi-rail generation.
Availability
LTC3372IUK#PBF is available at Aetrix Electronics and suitable for automotive ADAS domain controllers, industrial PLC I/O modules, and medical portable diagnostic devices requiring stable component supply, long-term lifecycle support, and guaranteed –40°C to 125°C operation.
Supply support for LTC3372IUK#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 industrial, automotive, communications, and healthcare markets.
The LTC3372IUK#PBF belongs to Analog Devices' Power by Linear™ family of highly integrated power management ICs, designed specifically for space-constrained, thermally demanding applications requiring ultra-low quiescent current and flexible multi-rail generation.
FAQ
What is the maximum input voltage supported by the LTC3372IUK#PBF's high-voltage controller?
The LTC3372IUK#PBF's high-voltage controller supports an absolute maximum input voltage of 65V on the VIN pin, with a recommended operating range of 4.5V to 60V. This enables direct connection to 48V industrial buses and 12V/24V automotive systems with transient headroom. Operation above 60V requires careful layout and derating per the Absolute Maximum Ratings table.
How does the C1–C3 pin configuration affect the LTC3372IUK#PBF's low-voltage output capabilities?
The C1–C3 pins on the LTC3372IUK#PBF determine how its eight integrated 1A power stages are grouped into 1–4 output channels. For example, C1=C2=C3=0 configures four 2A outputs, while C1=C2=C3=1 configures two 4A outputs. Each configuration fixes the current capability per channel and maps specific SWx pins to each output, directly defining the achievable voltage/current combinations without external component changes.
Can the LTC3372IUK#PBF generate both 3.3V and 5V high-voltage outputs simultaneously?
No, the LTC3372IUK#PBF's high-voltage controller produces a single regulated output voltage - either 3.3V or 5.0V - selected by the VOUTPRG pin (GND = 3.3V, INTVCC = 5.0V). However, its four low-voltage regulators can independently generate 3.3V, 5.0V, or other voltages (≥0.8V) using external feedback resistors, enabling multi-rail systems with mixed HV/LV sourcing.
What is the function of the TEMP pin on the LTC3372IUK#PBF, and how is it calibrated?
The TEMP pin on the LTC3372IUK#PBF provides an analog voltage proportional to die temperature: 220mV at 25°C with a slope of +7mV/°C. This output enables real-time thermal monitoring without external sensors. Calibration is factory-trimmed; users scale the measured voltage to temperature using the linear equation T(°C) = (VTEMP – 220mV) / 7mV/°C, supporting closed-loop thermal throttling or fault logging in host firmware.
Does the LTC3372IUK#PBF support synchronization of its switching frequency to an external clock source?
Yes, the LTC3372IUK#PBF supports external clock synchronization via the PLL/MODE pin. When driven with a clean square wave between 1MHz and 3MHz, the device locks its low-voltage regulator switching frequency (fSW) to the external signal, reducing EMI through frequency alignment. The HV controller automatically runs at 1/6 of that frequency, maintaining deterministic phase relationships across all regulators.
LTC3372IUK#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 48-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 5
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 4.5V ~ 60V
- Frequency - Switching:
- 1MHz ~ 3MHz
- Duty Cycle (Max):
- 98%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Enable, Frequency Control, Power Good, Soft Start, Tracking, Watchdog
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-QFN (7x7)
LTC3372IUK#PBF FAQ
1.How can I place an order for LTC3372IUK#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3372IUK#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 LTC3372IUK#PBF reliable?
The price and inventory of LTC3372IUK#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3372IUK#PBF is usually 5 days.
3.What payment methods are accepted for LTC3372IUK#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3372IUK#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3372IUK#PBF?
LTC3372IUK#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3372IUK#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 LTC3372IUK#PBF?
For technical support, including LTC3372IUK#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3372IUK#PBF requirements.
6.How does Aetrix verify that LTC3372IUK#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3372IUK#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 LTC3372IUK#PBF meets industry standards.
7.What is the process for return or replacement of LTC3372IUK#PBF?
All LTC3372IUK#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3372IUK#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 LTC3372IUK#PBF part is unused and in its original packaging.
Return procedure for LTC3372IUK#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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