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Analog Devices Inc. LTC3370EUH#PBF
- Part No.:
- LTC3370EUH#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC3370EUH#PBF.pdf
- Description:
- IC REG BUCK ADJ 2A QUAD 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,657
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Product details
Overview
LTC3370EUH#PBF from Analog Devices (formerly Linear Technology) is a configurable multi-output synchronous buck DC/DC power supply IC with eight 1A power stages, supporting 2–4 independent output channels (1A–4A per channel), 2.25V–5.5V input range per stage, and pin-selectable configurations via C1–C3. It enables autonomous power-up sequencing in automotive infotainment and industrial FPGA power systems.
For engineers reviewing the LTC3370EUH#PBF datasheet, LTC3370EUH#PBF pinout, LTC3370EUH#PBF application, or LTC3370EUH#PBF equivalent, key selection criteria include programmable 1–3MHz switching frequency, precision enable thresholds (±30mV), PGOODALL monitoring for all enabled bucks, die temperature reporting via TEMP pin, and 32-lead 5mm × 5mm QFN package with exposed thermal pad.
Technical Context
The LTC3370EUH#PBF integrates four synchronous buck regulators sharing eight discrete 1A power stages, each powered from independent VIN supplies. Its configuration logic uses C1–C3 pins to assign stages into 2A/3A/4A outputs, with phase-shifted 90° switching to reduce input ripple.
Operating mode (Burst Mode® or forced continuous) is selected via PLL/MODE pin; switching frequency is set by RT resistor, internal 2MHz oscillator, or external clock synchronization. PGOODALL asserts low if any enabled buck falls below 95–98% of its regulated output, and TEMP provides linear 7mV/°C voltage scaling from 220mV at 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.25V to 5.5V per VIN supply (supports independent rail inputs) |
| Output Current Configurations | Up to 4A per channel via 8×1A stages (e.g., 1×4A, 2×2A, 3×2A+1×2A) |
| Switching Frequency | 1MHz to 3MHz (RT-programmable), 2MHz default, or PLL-synchronized |
| Enable Threshold Accuracy | ±30mV over –40°C to 125°C (enables reliable sequencing without external supervision) |
| PGOODALL Logic | Open-drain active-low; asserts when any enabled buck drops below 95–98% of target VOUT |
| DIE Temperature Sensing | 220mV at 25°C, +7mV/°C slope (enables real-time thermal margining without external sensor) |
| Quiescent Current | 63µA (1 channel active, Burst Mode), 18µA per additional channel |
Pinout & Package
The LTC3370EUH#PBF is housed in a 32-lead 5mm × 5mm plastic QFN package with exposed GND pad (Pin 33) requiring PCB soldering for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VINA–VINH (Pins 1,4,5,8,17,20,21,24) | Independent input supplies | Each powers one 1A buck stage; requires local 10µF ceramic bypass |
| SWA–SWH (Pins 2,3,6,7,18,19,22,23) | Switch node outputs | Connect to external inductors; high dI/dt paths demand tight layout |
| FB1–FB4 (Pins 9,16,25,32) | Feedback inputs | Resistor-divider sense points; unused FB pins must be grounded |
| EN1–EN4 (Pins 10,15,26,31) | Active-high enable controls | Enable individual bucks; precision thresholds support autonomous sequencing |
| C1–C3 (Pins 11–13) | Configuration select bits | Set 1 of 8 output current configurations (e.g., 2×4A, 4×2A) |
| PGOODALL (Pin 14) | Global power-good status | Signals system readiness only when all enabled bucks are in regulation |
| TEMP (Pin 30) | Digital die temperature monitor | Analog voltage output (220mV @ 25°C, +7mV/°C) for thermal management |
| RT (Pin 27) | Oscillator frequency control | Resistor-to-GND sets fSW; tie to VCC for 2MHz default |
| PLL/MODE (Pin 28) | Mode and sync control | Ground = Burst Mode; VCC = forced continuous; external clock = sync + forced continuous |
Key Features
| Feature | Design Value |
|---|---|
| Configurable power stage allocation | Eight 1A stages assigned to 2–4 outputs via hardware pins-no firmware required |
| Autonomous power sequencing | Precision enable thresholds (±30mV) allow deterministic startup order across rails |
| Low-noise multi-phase operation | 90° phase shift between buck stages reduces input capacitor RMS current by ~30% |
| Thermal-aware system monitoring | Integrated die temperature sensor eliminates need for external thermal IC or NTC |
| Robust fault reporting | PGOODALL provides single-wire global status-simplifies system-level power validation |
Applications
| Automotive Infotainment SoC Power | Industrial FPGA Core & I/O Rails |
|---|---|
Use Scenario: Powering multiple voltage domains (core, memory, I/O) in head-unit SoCs with strict thermal and EMI limits. IC Role / Device Role / Timing Role: Primary multi-rail buck controller managing 1.0V core, 1.2V GPU, 1.8V DDR, and 3.3V interface rails from separate 3.3V/5V supplies. Use Value: Phase-shifted switching cuts input ripple by 40%, reducing bulk capacitance; PGOODALL simplifies boot validation across 4 rails. | Use Scenario: Delivering tightly regulated, sequenced voltages to Xilinx/Intel FPGAs in programmable logic controllers. IC Role / Device Role / Timing Role: Single-chip solution for 0.85V core, 1.2V transceiver, 1.8V memory, and 2.5V auxiliary rails with <100mV enable threshold tolerance. Use Value: Hardware-configured sequencing eliminates external supervisors; TEMP pin enables dynamic derating during ambient temperature excursions. |
| Medical Imaging Sensor Array | Telecom Baseband Processing Unit |
Use Scenario: Supplying low-noise bias to CMOS image sensor arrays requiring stable 1.2V, 1.8V, and 2.8V rails with minimal conducted EMI. IC Role / Device Role / Timing Role: Four-channel buck regulator delivering 1.2V/2A, 1.8V/2A, 2.5V/2A, and 2.8V/2A from isolated 3.3V/5V sources. Use Value: Independent VIN supplies prevent cross-rail noise coupling; Burst Mode achieves 63µA no-load IQ for standby power optimization. | Use Scenario: Powering heterogeneous baseband processors (ARM cores, DSPs, ADCs) in 5G small-cell units with thermal constraints. IC Role / Device Role / Timing Role: Configured as 2×3A + 2×1A outputs to match dynamic load profiles of compute and signal-processing blocks. Use Value: RT-programmable frequency allows EMI tuning around sensitive RF bands; 150°C junction rating supports operation in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-output buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65218D0RSLR | Fixed 4-output configuration (1.0V/1.2V/1.8V/3.3V); no stage reconfiguration; max 3A total output | Targeted at Sitara AMx processors; lacks independent VIN supplies and TEMP monitoring | Select when processor-specific fixed-rail support is prioritized over flexibility |
| ISL91211AIRZ-T7A | 4-channel, 12A total; supports DVS; no phase-shifting; 0.6V–3.75V VOUT range | Optimized for mobile APs; requires external sequencing IC; no integrated die temp sensor | Select for ultra-low-VOUT applications (<0.6V) or dynamic voltage scaling needs |
Compared with TPS65218D0RSLR and ISL91211AIRZ-T7A, the LTC3370EUH#PBF uniquely combines hardware-configurable current allocation, independent VIN rails, phase-shifted low-EMI operation, and on-die temperature sensing-making it optimal for thermally constrained, multi-supply industrial and automotive systems where flexibility and self-monitoring are critical.
Availability
LTC3370EUH#PBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial FPGA power, and medical imaging sensor array designs requiring stable component supply, extended temperature operation (–40°C to 125°C), and long-term lifecycle assurance.
Supply support for LTC3370EUH#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 acquired Linear Technology in 2017 and maintains its high-performance analog and power management portfolio with rigorous automotive and industrial qualification standards.
The LTC3370EUH#PBF belongs to Linear's configurable power management IC family, designed specifically for space-constrained, thermally demanding applications requiring flexible multi-rail generation without software intervention.
FAQ
What input voltage range does the LTC3370EUH#PBF support per channel?
The LTC3370EUH#PBF supports an input voltage range of 2.25V to 5.5V independently on each of its eight VIN pins (VINA–VINH). This allows connection to diverse intermediate rails-such as 3.3V, 5V, or battery-derived supplies-without level-shifting or external regulators. Each VIN must be bypassed with ≥10µF ceramic capacitance directly to GND.
How many output configurations does the LTC3370EUH#PBF support, and how are they selected?
The LTC3370EUH#PBF supports eight distinct output configurations (e.g., 1×4A, 2×2A, 3×2A+1×2A, 4×2A) selected via hardware using the C1, C2, and C3 pins. These three pins are tied to VCC or GND to encode binary values (000 to 111), determining how the eight 1A power stages are grouped into 2–4 output channels-no software or EEPROM programming is required.
Does the LTC3370EUH#PBF provide thermal monitoring, and how is it implemented?
Yes, the LTC3370EUH#PBF provides on-die thermal monitoring via the TEMP pin (Pin 30), which outputs a linear analog voltage: 220mV at 25°C with a slope of +7mV/°C. This enables direct measurement of junction temperature without external sensors, supporting thermal throttling, fan control, or system-level derating decisions in real time.
What is the function of the PGOODALL pin on the LTC3370EUH#PBF?
The PGOODALL pin (Pin 14) is an open-drain, active-low signal that indicates global power-good status. It goes low if *any* enabled buck regulator's output falls below its PGOOD threshold (98% for Buck 1, 95% for Bucks 2–4). It remains low when all bucks are disabled-providing a single-wire system-level validation signal for boot sequencing and fault detection.
Can the LTC3370EUH#PBF operate with different switching frequencies across its output channels?
No-the LTC3370EUH#PBF uses a common switching frequency for all enabled buck regulators. The frequency is set globally via the RT pin (resistor-programmable 1–3MHz), internal 2MHz oscillator (RT tied to VCC), or external clock applied to PLL/MODE. All channels switch synchronously with 90° phase offset to minimize input ripple.
LTC3370EUH#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 32-WFQFN Exposed Pad
- Packaging:
- Tube
- 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:
- 32-QFN (5x5)
LTC3370EUH#PBF FAQ
1.How can I place an order for LTC3370EUH#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3370EUH#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 LTC3370EUH#PBF reliable?
The price and inventory of LTC3370EUH#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3370EUH#PBF is usually 5 days.
3.What payment methods are accepted for LTC3370EUH#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3370EUH#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3370EUH#PBF?
LTC3370EUH#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3370EUH#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 LTC3370EUH#PBF?
For technical support, including LTC3370EUH#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3370EUH#PBF requirements.
6.How does Aetrix verify that LTC3370EUH#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3370EUH#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 LTC3370EUH#PBF meets industry standards.
7.What is the process for return or replacement of LTC3370EUH#PBF?
All LTC3370EUH#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3370EUH#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 LTC3370EUH#PBF part is unused and in its original packaging.
Return procedure for LTC3370EUH#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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