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Analog Devices Inc. LTC3370HUH
- Part No.:
- LTC3370HUH
- Manufacturer:
- Analog Devices Inc.
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC3370HUH.pdf
- Description:
- IC REG BUCK ADJ 2A QUAD 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,821
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Product details
Overview
LTC3370HUH from Analog Devices is a quad-output, pin-configurable PMIC with eight 1.5 A internal power stages supporting up to 8 A total output current. It operates from a 2.25 V to 5.5 V input supply (dc-to-dc converters) and 2.7 V to 5.5 V VCC, delivers output voltages from 0.8 V to VIN, and features 1 MHz to 3 MHz programmable switching frequency. Used in automotive infotainment and industrial embedded systems requiring flexible rail generation.
For engineers reviewing the LTC3370HUH datasheet, LTC3370HUH pinout, LTC3370HUH application, or LTC3370HUH equivalent, key selection criteria include its 8-output configuration flexibility via CFG pins, integrated current monitoring per channel, thermal shutdown at 165°C, ±1% output voltage accuracy, and compact 5 mm × 5 mm 32-lead QFN package with exposed pad.
Technical Context
The LTC3370HUH implements four synchronous buck regulators sharing eight configurable 1.5 A power stages, enabling eight distinct output current configurations (e.g., 4×2 A, 2×4 A, 1×8 A). Each buck channel supports independent feedback resistors for precise output voltage setting down to 0.8 V.
It uses pin-strappable CFG0–CFG2 inputs to select among eight pre-defined current allocations, includes differential remote sensing on all outputs, and integrates soft-start, short-circuit protection, and power-good indicators. The device operates in Burst Mode® for light-load efficiency or forced continuous PWM for low-noise operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.25 V to 5.5 V for dc-to-dc converters; 2.7 V to 5.5 V for VCC - enables direct use with Li-ion battery or 3.3 V/5 V system rails. |
| Total Output Current | Up to 8 A - achieved by combining internal 1.5 A stages across four buck channels, supporting scalable rail design without external paralleling. |
| Output Voltage Range | 0.8 V to VIN - supports core logic, I/O, and memory rails for modern microcontrollers and FPGAs. |
| Switching Frequency | 1 MHz to 3 MHz, programmable via RT resistor - allows optimization of size vs. EMI; default 2 MHz balances inductor size and noise. |
| Output Voltage Accuracy | ±1% over line, load, and temperature - ensures stable operation of sensitive digital loads without margining overhead. |
| Quiescent Current | 63 µA with one channel enabled - minimizes standby power loss in always-on automotive or industrial control modules. |
| Thermal Shutdown Threshold | 165°C (typical), with hysteresis to 155°C - protects die and PCB during overload or poor airflow conditions. |
Pinout & Package
The LTC3370HUH is housed in a 5 mm × 5 mm, 32-lead QFN package with exposed thermal pad (HUH suffix), optimized for high-power density and thermal dissipation in space-constrained applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VINA–VIND | Input voltage supply pins for buck channels A–D | Accepts separate or common 2.25 V–5.5 V inputs; enables independent rail sequencing and fault isolation. |
| SWA–SWD | Switch node outputs | Connect to external inductors; each drives one buck stage pair; layout requires low-inductance paths to minimize EMI. |
| FB1–FB4 | Feedback inputs | Differential sense inputs accepting resistor dividers; enable precise regulation independent of PCB trace IR drop. |
| PGOOD1–PGOOD4 | Power-good status outputs | Open-drain signals indicating ±5% output regulation; used for system power sequencing and fault reporting. |
| IMON1–IMON4 | Current monitor outputs | Analog current sources proportional to average channel load (1 µA/mA); enable real-time load telemetry without shunt resistors. |
| CFG0–CFG2 | Configuration select inputs | Three-pin binary code selects one of eight output current allocations (e.g., 2 A/2 A/2 A/2 A or 4 A/4 A/0 A/0 A). |
| TEMP | Die temperature monitor output | Analog voltage (10 mV/°C) read directly by MCU ADC; provides system-level thermal awareness without external sensor. |
| RUN1–RUN4 | Enable inputs | Individual channel enable/disable with precision thresholds; supports staggered startup and dynamic rail control. |
Key Features
| Feature | Design Value |
|---|---|
| Eight 1.5 A configurable power stages | Enables eight discrete output current configurations (e.g., 4×2 A, 2×4 A, 1×8 A) without changing BOM or layout. |
| Differential remote sensing per channel | Compensates for PCB trace resistance, maintaining ±1% regulation accuracy at point-of-load under varying current. |
| Integrated current monitors (IMON) | Eliminates need for external current-sense resistors and amplifiers, reducing component count and board area by ~12 mm² per channel. |
| Programmable 1 MHz–3 MHz switching frequency | Allows trade-off between small inductor size (high fSW) and lower switching losses (low fSW) based on thermal and EMI constraints. |
| Burst Mode® and forced PWM modes | Extends battery life in standby (Burst Mode®: 63 µA IQ) while preserving signal integrity in active mode (PWM: <20 mVPP ripple). |
Applications
| Automotive Infotainment Head Unit | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Powering display controller, audio codec, CAN transceiver, and microcontroller in a compact dashboard module operating at 125°C ambient. IC Role / Device Role / Timing Role: Quad-buck PMIC generating 1.2 V (core), 3.3 V (I/O), 5 V (audio), and 12 V (backlight boost) rails from a 5 V intermediate bus. Use Value: Configurable current allocation avoids overdesign; thermal monitoring via TEMP pin enables dynamic derating before system shutdown. |
Use Scenario: Supplying isolated field I/O circuits, FPGA configuration, and communication interfaces in a DIN-rail mounted controller with strict EMC requirements. IC Role / Device Role / Timing Role: Generating 1.8 V (FPGA core), 3.3 V (SPI peripherals), 5 V (RS-485 transceivers), and 24 V (field-side bias) using external boost stage. Use Value: Differential FB sensing maintains regulation despite long PCB traces; IMON outputs feed into safety PLC for real-time load diagnostics. |
| Medical Patient Monitor Front Panel | Edge AI Sensor Hub |
|
Use Scenario: Powering touch controller, OLED display driver, biometric sensor array, and low-power MCU in a battery-backed portable monitor. IC Role / Device Role / Timing Role: Delivering 1.1 V (sensor ASIC), 1.8 V (MCU core), 3.3 V (touch interface), and 5 V (OLED bias) with ultra-low quiescent current. Use Value: 63 µA IQ in single-channel mode extends battery runtime; PGOOD signals coordinate safe shutdown during low-battery events. |
Use Scenario: Supporting vision processing SoC, Wi-Fi/BLE radio, environmental sensors, and flash memory in a fanless edge gateway. IC Role / Device Role / Timing Role: Providing 0.85 V (SoC core), 1.1 V (GPU), 3.3 V (radio), and 5 V (USB peripheral) with fast transient response to burst workloads. Use Value: 2 MHz default switching frequency enables <1 mm³ inductors; soft-start prevents inrush-induced brownouts during boot. |
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, same 1–3 MHz frequency range, but larger 5×7 mm 38-lead QFN package. | Supports higher channel count with lower per-rail current; less suitable when only 4 rails are needed and board area is constrained. | Select LTC3374A when system requires >4 independently regulated rails or future expansion headroom. |
| LTC3375 | Octal-buck with I²C interface, 48-lead QFN, supports 0.425 V–VIN output range, and adds digital configuration capability beyond pin-strapping. | Enables dynamic reconfiguration in-field; requires MCU firmware support and additional I²C routing versus simple CFG pin wiring. | Select LTC3375 when runtime rail adjustment or telemetry logging is required, and I²C infrastructure is already present. |
Compared with LTC3374A and LTC3375, the LTC3370HUH offers optimal balance of channel count, package size, and pin-strapped simplicity for fixed-function 4-rail systems-reducing layout complexity and eliminating firmware dependencies while delivering full 8 A aggregate capacity.
Availability
LTC3370HUH is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLCs, and medical patient monitors requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across production batches.
Supply support for LTC3370HUH 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 LTC3370HUH belongs to ADI's Power by Linear configurable buck regulator family, designed specifically for space-constrained systems needing flexible, multi-rail power delivery without software dependency or excessive integration overhead.
FAQ
What is the maximum total output current supported by the LTC3370HUH?
The LTC3370HUH supports up to 8 A total output current by configuring its eight internal 1.5 A power stages across four buck channels. Valid configurations include 4×2 A, 2×4 A, or 1×8 A, selected via CFG0–CFG2 pins. This aggregate rating assumes proper thermal management and recommended PCB layout with the exposed pad soldered to a thermal plane.
Does the LTC3370HUH require external bootstrap capacitors?
No, the LTC3370HUH does not require external bootstrap capacitors. Its internal architecture integrates bootstrap circuitry within the die and package, eliminating the need for external BST caps and simplifying layout. This reduces component count and improves reliability compared to traditional buck controllers requiring discrete bootstrap networks.
How does the LTC3370HUH handle thermal protection?
The LTC3370HUH incorporates dual thermal functions: a die temperature monitor output (TEMP pin, 10 mV/°C) for system-level thermal telemetry, and an overtemperature shutdown that disables all enabled buck regulators at 165°C (typical), re-enabling only after die temperature falls to 155°C. This protects both the IC and surrounding components during sustained overload or inadequate cooling.
Can the LTC3370HUH generate output voltages below 0.8 V?
No, the LTC3370HUH specifies a minimum output voltage of 0.8 V, as confirmed in Table 2 of the official documentation. Unlike the LTC3376 (0.4 V min), this device's internal reference and feedback architecture are optimized for 0.8 V and above - making it unsuitable for sub-0.8 V core rails such as advanced SoC cores requiring 0.6 V or lower.
What package type and thermal characteristics define the LTC3370HUH?
The LTC3370HUH is offered exclusively in a 5 mm × 5 mm, 32-lead QFN package with exposed thermal pad (HUH suffix). Its thermal resistance θJA is 35°C/W (with 2-layer 2 oz copper PCB and 2 cm² thermal pad), enabling reliable 8 A operation at +85°C ambient when properly mounted. The exposed pad must be soldered to a solid copper plane for rated performance.
LTC3370HUH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 32-WFQFN 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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-QFN (5x5)
LTC3370HUH FAQ
1.How can I place an order for LTC3370HUH through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3370HUH 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 LTC3370HUH reliable?
The price and inventory of LTC3370HUH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3370HUH is usually 5 days.
3.What payment methods are accepted for LTC3370HUH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3370HUH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3370HUH?
LTC3370HUH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3370HUH 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 LTC3370HUH?
For technical support, including LTC3370HUH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3370HUH requirements.
6.How does Aetrix verify that LTC3370HUH is sourced from the original manufacturer or authorized distributors?
All LTC3370HUH 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 LTC3370HUH meets industry standards.
7.What is the process for return or replacement of LTC3370HUH?
All LTC3370HUH units undergo pre-shipment inspection (PSI). If there is an issue with LTC3370HUH, 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 LTC3370HUH part is unused and in its original packaging.
Return procedure for LTC3370HUH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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