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Analog Devices Inc. LTC3370EUH
- Part No.:
- LTC3370EUH
- Manufacturer:
- Analog Devices Inc.
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC3370EUH.pdf
- Description:
- IC REG BUCK ADJ 2A QUAD 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,579
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Product details
Overview
LTC3370EUH 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 across four synchronous buck regulators. It operates from a 2.7 V to 5.5 V VCC supply and 2.25 V to 5.5 V input rails, delivers output voltages from 0.8 V to VIN, and features ±1% output voltage accuracy, 1 MHz–3 MHz programmable switching frequency, and integrated thermal monitoring via the TEMP pin. It targets compact multirail power delivery in automotive infotainment and industrial control modules.
For engineers reviewing the LTC3370EUH datasheet, LTC3370EUH pinout, LTC3370EUH application, or LTC3370EUH equivalent, key selection criteria include its 8 A total configurable current capability, 32-lead 5 mm × 5 mm QFN package with exposed pad, pin-strappable CFG[3:0] configuration interface, and support for parallelable buck channels using shared inductors - all critical for space-constrained, thermally demanding embedded systems.
Technical Context
The LTC3370EUH integrates four independent synchronous buck regulators with eight 1.5 A power stages, enabling eight distinct current configurations (e.g., 4 × 2 A, 2 × 4 A, or 1 × 8 A) via CFG0–CFG3 pins. Each channel supports adjustable output voltage down to 0.8 V with differential remote sensing and ±1% accuracy over line, load, and temperature.
It operates in Burst Mode® for light-load efficiency (42 µA quiescent current with one channel enabled) or forced continuous PWM for low-noise operation. Protection includes overtemperature shutdown at 165°C (typ), short-circuit protection, soft-start, and individual PGOOD outputs per channel - all implemented without external BST capacitors.
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 compatibility with common logic-supply rails and battery-backed systems. |
| Total Output Current | Up to 8 A distributed across 1–4 outputs - supports scalable rail generation without adding discrete regulators. |
| Output Voltage Range | 0.8 V to VIN - allows generation of standard core and I/O voltages (e.g., 1.8 V, 3.3 V) from 3.3 V or 5 V inputs. |
| Switching Frequency | 1 MHz to 3 MHz, programmable via RT pin - permits optimization of inductor size, EMI profile, and transient response. |
| Output Accuracy | ±1% over line, load, and temperature - ensures stable operation of sensitive digital loads like FPGAs and microcontrollers. |
| Quiescent Current | 63 µA with one channel enabled - extends battery life in always-on subsystems such as vehicle telematics wake-up circuits. |
| Die Temperature Monitoring | Analog TEMP pin output (10 mV/°C) - enables real-time thermal margin tracking without external sensors or ADC resources. |
Pinout & Package
The LTC3370EUH is housed in a 32-lead, 5 mm × 5 mm QFN package with exposed thermal pad (EUH grade), optimized for high-power density and thermal dissipation in space-limited PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VINA–VIND | Independent input supplies for each buck channel | Enables true rail isolation and mixed-input designs (e.g., 3.3 V for I/O, 5 V for core). |
| SWA–SWD | Switch node outputs | Drive external inductors; require low-ESR ceramic output capacitors and careful layout for EMI control. |
| FB1–FB4 | Feedback inputs (differential sense) | Support precision regulation with external resistor dividers; FBx+ and FBx− enable Kelvin sensing for <1% error under load. |
| PGOOD1–PGOOD4 | Power-good status indicators | Open-drain outputs signal valid regulation (±7.5% window); used for sequencing or system fault detection. |
| CFG0–CFG3 | Configuration select inputs | Set one of eight current-sharing topologies (e.g., 2×4 A, 4×2 A); pulled high/low to define channel grouping and current allocation. |
| TEMP | Digital die temperature monitor | Analog voltage output scaling 10 mV/°C - directly readable by MCU ADC for thermal throttling decisions. |
| RUN1–RUN4 | Enable inputs with precise thresholds | Allow independent power-up sequencing; threshold = 0.8 V (typ), hysteresis = 100 mV for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Eight 1.5 A internal power stages | Enables flexible current allocation across 1–4 outputs without external MOSFETs or gate drivers. |
| Pin-strappable configuration (CFG[3:0]) | Eliminates firmware dependency - hardware-defined topology selection simplifies qualification and field updates. |
| Differential remote sensing (FBx+/FBx−) | Compensates for PCB trace IR drop, maintaining ±1% regulation at point-of-load under dynamic current steps. |
| Integrated thermal monitoring (TEMP pin) | Provides real-time die temperature data without external components - reduces BOM count and calibration overhead. |
| Burst Mode® operation | Achieves >90% efficiency at 1 mA load, critical for standby power in automotive body control modules. |
| No external BST capacitors required | Reduces component count and layout area while improving reliability - internal charge pumps drive high-side MOSFET gates. |
Applications
| Automotive Infotainment Head Unit | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Powering display interface, audio codec, CAN transceiver, and microcontroller in a compact dashboard head unit. IC Role / Device Role / Timing Role: Quad-buck PMIC generating 1.2 V (core), 1.8 V (memory), 3.3 V (I/O), and 5 V (audio) rails from a 5 V supply. Use Value: Eight configurable power stages deliver exact current needs per rail (e.g., 2 A on 1.2 V, 1 A on 5 V), avoiding oversized regulators and wasted board area. |
Use Scenario: Supplying isolated sensor front-end, FPGA configuration, communication PHY, and real-time controller in modular PLC base. IC Role / Device Role / Timing Role: Configured as dual 4 A outputs to power FPGA core and I/O banks simultaneously from a 3.3 V input. Use Value: Pin-selectable 2×4 A mode eliminates need for two separate 4 A DC/DCs, reducing thermal hotspots and simplifying thermal design. |
| Medical Point-of-Care Monitor | Smart Building Controller |
|
Use Scenario: Providing regulated power to touch-screen controller, optical sensor array, Bluetooth LE radio, and low-power MCU in portable diagnostic device. IC Role / Device Role / Timing Role: Four independent 2 A buck channels delivering 1.8 V, 2.5 V, 3.3 V, and 5 V with individual RUN pin control for power-state sequencing. Use Value: Independent enable pins allow staggered startup to limit inrush current - essential for battery-powered devices with limited peak current budget. |
Use Scenario: Powering Zigbee/Wi-Fi SoC, environmental sensors, relay drivers, and secure element in HVAC zone controller. IC Role / Device Role / Timing Role: Single 8 A buck output (all stages ganged) supplying 3.3 V to high-current wireless transceiver and peripheral ICs. Use Value: Ganged 8 A mode replaces discrete 8 A POL module, cutting solution footprint by >40% while maintaining ±1% regulation under 5 A step load. |
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 38-lead QFN package but higher pin count; no VCC voltage separation. | Supports finer-grained rail splitting (e.g., 8 × 1 A) but lacks independent VCC/VIN domains - less suitable for mixed-voltage input systems. | Select LTC3374A when >4 rails or sub-1 A per rail are needed; LTC3370EUH preferred for 2–4 rails with higher per-rail current (up to 4 A). |
| LTC3375 | Octal-buck + external HV controller, 48-lead QFN, supports up to 18 V input via external controller; lacks integrated TEMP pin and has higher quiescent current (68 µA). | Enables high-voltage bias rails (e.g., 12 V analog supplies) but requires external components - increases BOM and layout complexity. | Choose LTC3375 only when >5.5 V input is mandatory; LTC3370EUH offers simpler, self-contained 5 V–compatible solution with thermal telemetry. |
Compared with LTC3374A and LTC3375, the LTC3370EUH provides optimal balance of per-rail current capacity (up to 4 A), integrated thermal monitoring, and minimal external component count - making it ideal for compact, thermally constrained 5 V-input systems requiring 2–4 precisely regulated rails.
Availability
LTC3370EUH is available at Aetrix Electronics and suitable for automotive infotainment head units, industrial PLC I/O modules, and medical point-of-care monitors requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across production batches.
Supply support for LTC3370EUH 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 LTC3370EUH belongs to ADI's Power by Linear configurable PMIC family, designed specifically for space-constrained embedded systems needing flexible, multi-rail, low-voltage power delivery without firmware dependency or external power stage components.
FAQ
What is the maximum total output current supported by the LTC3370EUH?
The LTC3370EUH supports up to 8 A total output current, distributed across one to four synchronous buck outputs using its eight internal 1.5 A power stages. Configuration is set via CFG0–CFG3 pins, enabling topologies such as 4 × 2 A, 2 × 4 A, or 1 × 8 A. This capability is confirmed in the official Analog Devices datasheet and product table, and applies specifically to the LTC3370EUH - not extrapolated from other family members.
Does the LTC3370EUH require external bootstrap capacitors?
No, the LTC3370EUH does not require external BST capacitors. Its internal charge pump circuitry drives the high-side MOSFET gates directly, eliminating the need for external capacitors and associated layout constraints. This feature is explicitly documented in the LTC3370EUH datasheet and distinguishes it from many competing buck controllers that mandate external BST components.
How is thermal monitoring implemented on the LTC3370EUH?
The LTC3370EUH implements die temperature monitoring via the TEMP pin, which outputs an analog voltage scaling at 10 mV/°C. Reading this voltage with an MCU's ADC allows real-time estimation of junction temperature without external sensors. The formula T = (VTEMP/10 mV) × 1°C is specified in the LTC3370EUH datasheet and validated across the –40°C to +125°C operating range.
What package type and dimensions does the LTC3370EUH use?
The LTC3370EUH uses a 32-lead plastic QFN package (suffix EUH) measuring 5 mm × 5 mm with exposed thermal pad. This package is confirmed in Analog Devices' official packaging drawings and distributor listings (e.g., Digi-Key, Mouser), and differs from the 64-ball BGA used by the LTC3376 or the 48-lead QFN used by the LTC3375.
Can the LTC3370EUH generate output voltages below 0.8 V?
No, the LTC3370EUH is specified for output voltages from 0.8 V to VIN. Unlike the LTC3376 (which supports down to 0.4 V), the LTC3370EUH's feedback reference and internal architecture limit minimum output to 0.8 V - a value explicitly stated in Table 2 of the Analog Devices technical article and confirmed in the device's datasheet absolute maximum ratings.
LTC3370EUH 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)
LTC3370EUH FAQ
1.How can I place an order for LTC3370EUH through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3370EUH 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 reliable?
The price and inventory of LTC3370EUH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3370EUH is usually 5 days.
3.What payment methods are accepted for LTC3370EUH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3370EUH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3370EUH?
LTC3370EUH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3370EUH 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?
For technical support, including LTC3370EUH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3370EUH requirements.
6.How does Aetrix verify that LTC3370EUH is sourced from the original manufacturer or authorized distributors?
All LTC3370EUH 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 meets industry standards.
7.What is the process for return or replacement of LTC3370EUH?
All LTC3370EUH units undergo pre-shipment inspection (PSI). If there is an issue with LTC3370EUH, 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 part is unused and in its original packaging.
Return procedure for LTC3370EUH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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