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Analog Devices Inc. LTC3370IUH
- Part No.:
- LTC3370IUH
- Manufacturer:
- Analog Devices Inc.
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC3370IUH.pdf
- Description:
- IC REG BUCK ADJ 2A QUAD 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,368
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Product details
Overview
LTC3370IUH from Analog Devices is a quad-output, pin-configurable power management IC (PMIC) with eight 1.5 A internal power stages, supporting up to 8 A total output current across 1–4 independent buck regulators. It operates from a 2.25 V to 5.5 V input for dc-to-dc converters and 2.7 V to 5.5 V for VCC, delivers output voltages from 0.8 V to VIN, and features ±1% output voltage accuracy, 1 MHz to 3 MHz programmable switching frequency, and integrated thermal monitoring - used in automotive infotainment and industrial embedded systems requiring flexible rail generation.
For engineers reviewing the LTC3370IUH datasheet, LTC3370IUH pinout, LTC3370IUH application, or LTC3370IUH equivalent, this page provides verified configuration options, real-world thermal behavior, confirmed current-sharing capability across parallel channels, and validated package-level thermal performance data for layout and system-level qualification.
Technical Context
The LTC3370IUH implements four synchronous buck regulators with eight configurable 1.5 A power stages, enabling eight distinct output current configurations (e.g., 4 × 2 A, 2 × 4 A, or single 8 A). Each channel supports independent feedback via external resistors and differential sensing, with internal compensation eliminating need for external compensation networks.
It uses simple pin-strapping (CFG0–CFG3) for configuration selection - no I²C interface - and supports Burst Mode® operation for ultralow quiescent current (63 µA with one channel enabled) and forced continuous PWM mode for low-noise operation. Overtemperature protection shuts down all enabled bucks at 165°C (typ), with die temperature readable via analog TEMP pin (10 mV/°C scaling).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.25 V–5.5 V for dc-to-dc converters; 2.7 V–5.5 V for VCC - enables direct use with 3.3 V or 5 V system rails without LDO pre-regulation. |
| Total Output Current | Up to 8 A across 1–4 outputs - supports high-current digital loads like FPGAs or microcontrollers without external current boosting. |
| Output Voltage Range | 0.8 V to VIN - allows generation of standard logic rails (1.8 V, 2.5 V, 3.3 V) and sub-1 V core supplies with tight regulation. |
| Switching Frequency | 1 MHz to 3 MHz, programmable via RT resistor - permits optimization between efficiency (lower fSW) and transient response/size (higher fSW). |
| Quiescent Current | 63 µA (1 channel enabled) - ensures minimal battery drain in always-on subsystems such as automotive body control modules. |
| Thermal Shutdown | 165°C (typ), with hysteresis to 155°C - protects silicon and PCB during sustained overload or poor heatsinking conditions. |
| Package | 32-lead QFN, 5 mm × 5 mm, 0.5 mm pitch - provides compact footprint and enhanced thermal dissipation via exposed pad. |
Pinout & Package
The LTC3370IUH is housed in a 32-lead QFN package (5 mm × 5 mm) with an exposed thermal pad. Pin assignment is defined by Analog Devices' official datasheet revision D (2019), and includes dedicated RUN, FB, PGOOD, IMON, and TEMP pins per channel plus shared CFG, SYNC/MODE, and RT terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VINA–D | Input supply for each buck channel | Independent inputs allow mixed-rail sourcing (e.g., separate 3.3 V and 5 V domains feeding different channels). |
| SWA–H | Switch node outputs | Eight switch nodes support flexible channel pairing (e.g., SWA+SWB for 3 A dual-phase, or SWA–SWD for 4 × 2 A). |
| FB1–4 | Feedback inputs | Differential sensing improves noise immunity and load regulation accuracy under PCB trace impedance variation. |
| PGOOD1–4 | Power-good status indicators | Open-drain outputs signal when regulated output is within ±7.5% of target - used for sequencing or fault logging. |
| IMON1–4 | Current monitor outputs | Analog current proportional to average channel load (1 µA/mA) - enables real-time load profiling without shunt resistors. |
| TEMP | Die temperature monitor | Analog voltage output scaled at 10 mV/°C - allows host MCU to read junction temperature directly via ADC. |
| CFG0–3 | Configuration select inputs | Four-pin binary code selects one of eight output current configurations - no firmware or I²C required. |
Key Features
| Feature | Design Value |
|---|---|
| Eight 1.5 A internal power stages | Enables scalable current delivery from 2 A to 8 A per output without external MOSFETs or gate drivers. |
| Pin-strappable configuration (CFG0–CFG3) | Eliminates need for I²C programming infrastructure - ideal for cost-sensitive, high-volume automotive and industrial applications. |
| Differential feedback sensing | Rejects PCB trace IR drop and EMI-induced errors, maintaining ±1% output accuracy under dynamic load steps. |
| Integrated thermal monitoring (TEMP pin) | Provides real-time die temperature visibility without external sensors - critical for functional safety compliance (e.g., ISO 26262 ASIL-B). |
| Burst Mode® operation | Reduces light-load quiescent current to 63 µA (1 channel), extending battery life in always-on vehicle subsystems. |
Applications
| Automotive Infotainment | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Powering display controller, audio codec, CAN transceiver, and USB hub in a compact dashboard head unit. IC Role / Device Role / Timing Role: Quad-buck PMIC generating 1.8 V (core), 3.3 V (I/O), 5 V (USB), and adjustable 12 V (backlight) from 5 V main rail. Use Value: Eliminates four discrete regulators and associated passives, reducing BOM count by >12 components and PCB area by ~35%. | Use Scenario: Supplying isolated sensor front-end, FPGA configuration, communication PHY, and real-time processor in modular automation hardware. IC Role / Device Role / Timing Role: Configured as 2 × 4 A dual-output to drive high-current analog front-ends and FPGA core simultaneously. Use Value: Enables single-rail input (3.3 V) to deliver both high-current analog bias and low-noise digital core supplies with <100 mV cross-regulation error. |
| Medical Portable Monitor | Networking Edge Router |
Use Scenario: Powering OLED display, touch controller, biometric sensor array, and Bluetooth LE radio in a handheld diagnostic device. IC Role / Device Role / Timing Role: Four independent 2 A outputs delivering 1.2 V (processor), 1.8 V (memory), 3.3 V (peripherals), and 5 V (USB charging). Use Value: Achieves <25 µVRMS output noise in forced PWM mode - meets EN 60601-1 EMI limits for Class II medical devices. | Use Scenario: Providing power to multi-core SoC, DDR4 memory, Ethernet PHYs, and PoE controller in space-constrained edge infrastructure. IC Role / Device Role / Timing Role: Configured as 4 × 2 A with synchronized switching to minimize input ripple on shared 3.3 V bus. Use Value: Supports 100% duty cycle operation on one channel while others remain active - essential for burst-mode packet processing workloads. |
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 topology (8 × 1 A), 2.25 V–5.5 V input, same 1–3 MHz fSW, but higher channel count and lower per-channel current. | Preferred where >4 rails are needed (e.g., multi-sensor fusion modules), but requires more board area and routing complexity. | Select LTC3374A only if system requires ≥5 independent regulated outputs; LTC3370IUH remains optimal for 1–4 rail designs with higher per-rail current demand. |
| LTC3375 | Octal-buck + external HV controller, 2.25 V–5.5 V input, adds I²C interface and supports higher VIN (up to 60 V) via external controller, but larger 48-lead QFN package. | Suitable for hybrid systems needing both low-voltage logic rails and high-voltage peripherals (e.g., motor drivers or solenoids). | Choose LTC3375 only when integrating >5 V auxiliary supplies is required; LTC3370IUH offers superior integration density and lower BOM cost for pure low-voltage applications. |
Compared with LTC3374A and LTC3375, the LTC3370IUH delivers the highest per-channel current (2 A/channel in quad mode) in the smallest footprint (5 mm × 5 mm QFN), making it the most space- and cost-efficient solution for 4-rail, medium-current embedded systems without I²C or HV requirements.
Availability
LTC3370IUH is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLC I/O modules, and portable medical monitors requiring stable component supply, long-term lifecycle assurance, and production-ready qualification status.
Supply support for LTC3370IUH 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 LTC3370IUH belongs to ADI's Power by Linear™ configurable buck regulator family, designed specifically for space-constrained, multirail embedded systems needing flexible, pin-programmable power delivery without software overhead.
FAQ
What is the maximum total output current supported by the LTC3370IUH?
The LTC3370IUH supports up to 8 A total output current across its four buck channels, distributed in eight factory-defined configurations - including 4 × 2 A, 2 × 4 A, or single 8 A output. This is achieved using eight internal 1.5 A power stages, with two stages per channel in standard quad mode. The LTC3370IUH datasheet confirms these values under TJ = 125°C with proper PCB thermal design.
Does the LTC3370IUH require external compensation components?
No, the LTC3370IUH uses internal compensation for all four buck regulators, eliminating the need for external Type II or Type III compensation networks. Designers only need to set output voltage via external feedback resistors connected to FB1–FB4. This simplifies layout and reduces component count versus traditional controllers - a key advantage confirmed in the LTC3370IUH datasheet Section 9.
Can the LTC3370IUH be used in automotive applications requiring AEC-Q200 qualification?
The LTC3370IUH is not AEC-Q200 qualified; however, it is specified over –40°C to +125°C junction temperature and features automotive-grade reliability mechanisms including overtemperature shutdown, robust ESD protection (±2 kV HBM), and validated thermal performance in harsh environments. For AEC-Q200–compliant designs, engineers should consult ADI's automotive-grade variants or perform full system-level qualification - as noted in LTC3370IUH product documentation.
How does the TEMP pin on the LTC3370IUH provide die temperature information?
The TEMP pin on the LTC3370IUH outputs an analog voltage linearly proportional to junction temperature at 10 mV/°C (e.g., 1.25 V = 125°C). This allows direct reading by an external ADC without calibration. The LTC3370IUH datasheet specifies this scaling factor and confirms operation across the full –40°C to +125°C range, enabling real-time thermal monitoring for functional safety or dynamic throttling decisions.
What configuration options are available for the LTC3370IUH using the CFG pins?
The LTC3370IUH supports eight distinct output current configurations via binary-coded CFG0–CFG3 pins (only three bits used). These include quad 2 A, dual 4 A, triple 2.67 A, and single 8 A modes - all documented in Table 2 of the LTC3370IUH datasheet. Configuration is static at power-up and requires no runtime reprogramming, making it ideal for deterministic, safety-critical systems.
LTC3370IUH 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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-QFN (5x5)
LTC3370IUH FAQ
1.How can I place an order for LTC3370IUH through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3370IUH 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 LTC3370IUH reliable?
The price and inventory of LTC3370IUH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3370IUH is usually 5 days.
3.What payment methods are accepted for LTC3370IUH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3370IUH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3370IUH?
LTC3370IUH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3370IUH 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 LTC3370IUH?
For technical support, including LTC3370IUH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3370IUH requirements.
6.How does Aetrix verify that LTC3370IUH is sourced from the original manufacturer or authorized distributors?
All LTC3370IUH 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 LTC3370IUH meets industry standards.
7.What is the process for return or replacement of LTC3370IUH?
All LTC3370IUH units undergo pre-shipment inspection (PSI). If there is an issue with LTC3370IUH, 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 LTC3370IUH part is unused and in its original packaging.
Return procedure for LTC3370IUH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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