LTC3370EUH#PBF - 4-Ch 8A Configurable Buck DC/DC | Analog Devices
MPN: LTC3370EUH#PBF ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $10.29 | $10.29 |
| 10 | $9.45 | $94.50 |
| 100 | $8.57 | $857.00 |
| 500 | $7.82 | $3,910.00 |
| 1,000 | $7.15 | $7,150.00 |
LTC3370EUH#PBF Overview
A multioutput buck converter is a type of DC-DC switching regulator that provides multiple regulated output voltages from a single input supply. It belongs to the broader category of power management ICs (PMICs), which manage power distribution and conversion in electronic systems. The LTC3370 is a synchronous buck converter, meaning it uses both high-side and low-side switches to achieve high efficiency, especially at lower output voltages. This architecture reduces power loss compared to asynchronous converters, making it ideal for battery-powered and energy-sensitive applications.
Key features of the LTC3370EUH#PBF include four independent buck converters with a total output current of 8A (eight 1A stages), adjustable output voltages from 0.8V to 5.5V, and a wide input voltage range of 2.25V to 5.5V. The device supports eight distinct power configurations, allowing designers to allocate the 1A stages flexibly among the four outputs. The switching frequency is programmable from 1MHz to 3MHz via an external resistor, enabling trade-offs between efficiency and component size. Additionally, the LTC3370 includes internal compensation, soft-start, and overcurrent protection, simplifying design and enhancing reliability.
From a technical perspective, the LTC3370 uses a current-mode control architecture with synchronous rectification, achieving efficiencies up to 95%. The eight 1A power stages can be paralleled to provide higher current on a single output, such as 4A on one output while the others are disabled. The C1-C3 pins allow configuration of the power stage assignment, providing flexibility for various load requirements. The device also features a power-good output and an enable pin for each channel, enabling sequenced power-up and fault monitoring. The 32-lead WFQFN package with exposed pad ensures excellent thermal performance, with a thermal resistance of approximately 28°C/W.
Typical applications for the LTC3370EUH#PBF include portable and battery-powered devices, FPGA and DSP power supplies, solid-state drives, and industrial equipment. Its ability to provide multiple regulated rails from a single input makes it ideal for systems requiring core, I/O, and auxiliary voltages. The high efficiency and low quiescent current extend battery life in handheld devices, while the programmable frequency allows optimization for EMI-sensitive applications.
When designing with the LTC3370, it is important to select appropriate external inductors and capacitors based on the switching frequency and output current. The exposed pad should be soldered to a large copper area for effective heat dissipation. Additionally, the C1-C3 pins must be configured correctly to achieve the desired power stage allocation, and the RT pin resistor sets the switching frequency. Proper layout with short, low-inductance paths for the switching nodes is critical to minimize noise and ensure stable operation.
Drop-in alternatives for LTC3370EUH#PBF — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with LTC3370EUH#PBF (same form factor and footprint) — differing in Package, Maximum Output Current, Operating Temperature Range, Output Voltage Range, Switching Frequency.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LTC3370HUH#PBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC3370IUH#PBF
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$5.5 / Unit
View Datasheet →LTC3370EUH#TRPBF
✅ Drop-In✓ In Stock
$3.92 / Unit
View Datasheet →LTC3370EUH
✅ Drop-In📋 Reference alternative (not in catalog)
LTC3370HUH#TRPBF
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
LTC3370IUH#TRPBF
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$3.94 / Unit
View Datasheet →LTC3370EUH#PBF Maximum Ratings & Electrical Characteristics
| Output Type | Adjustable |
| Output Voltage Range | 0.8V to 5.5V |
| Maximum Output Current | 8A (total, eight 1A stages) |
| Input Voltage Range | 2.25V to 5.5V |
| Number of Outputs | 4 |
| Switching Frequency | 1MHz to 3MHz (programmable) |
| Synchronous Rectification | Yes |
| Efficiency | Up to 95% |
| Package | 32-WFQFN Exposed Pad (EUH) |
| Mounting Type | Surface Mount |
| Operating Temperature Range | -40°C to +125°C |
| RoHS Status | Compliant |
| Control Architecture | Current Mode |
LTC3370EUH#PBF Pin Configuration
| Pin 1 | SW1 — Switch node for buck converter 1 |
| Pin 2 | VIN1 — Input supply for buck converter 1 |
| Pin 3 | VIN2 — Input supply for buck converter 2 |
| Pin 4 | SW2 — Switch node for buck converter 2 |
| Pin 5 | GND — Ground |
| Pin 6 | SW3 — Switch node for buck converter 3 |
| Pin 7 | VIN3 — Input supply for buck converter 3 |
| Pin 8 | VIN4 — Input supply for buck converter 4 |
| Pin 9 | SW4 — Switch node for buck converter 4 |
| Pin 10 | GND — Ground |
| Pin 11 | C1 — Configuration pin 1 |
| Pin 12 | C2 — Configuration pin 2 |
| Pin 13 | C3 — Configuration pin 3 |
| Pin 14 | RT — Switching frequency programming pin |
| Pin 15 | EN1 — Enable for buck converter 1 |
| Pin 16 | EN2 — Enable for buck converter 2 |
| Pin 17 | EN3 — Enable for buck converter 3 |
| Pin 18 | EN4 — Enable for buck converter 4 |
| Pin 19 | PG — Power good output |
| Pin 20 | VOUT1 — Output voltage sense for buck converter 1 |
| Pin 21 | VOUT2 — Output voltage sense for buck converter 2 |
| Pin 22 | VOUT3 — Output voltage sense for buck converter 3 |
| Pin 23 | VOUT4 — Output voltage sense for buck converter 4 |
| Pin 24 | GND — Ground |
| Pin 25 | EXPOSED PAD — Exposed pad for thermal dissipation, connect to GND |
Typical Applications
LTC3370EUH#PBF is suitable for 6 applications: Portable and Battery-Powered Devices, FPGA and DSP Power Supplies, Solid-State Drives (SSDs), Industrial Equipment, Networking and Communication Equipment, Automotive Electronics (Non-AEC-Q100).
Portable and Battery-Powered Devices
The LTC3370EUH#PBF is ideal for portable devices like smartphones, tablets, and wearables, where multiple regulated rails are needed from a single battery. Its wide input range (2.25V to 5.5V) accommodates Li-Ion batteries, and the high efficiency (up to 95%) extends battery life. The configurable power stages allow designers to allocate current to different subsystems, such as processor core, memory, and I/O, optimizing power delivery. The low quiescent current in light-load modes further enhances battery endurance.
Recommended
FPGA and DSP Power Supplies
FPGAs and DSPs require multiple voltage rails (e.g., core, I/O, auxiliary) with precise regulation and sequencing. The LTC3370EUH#PBF provides up to four independent outputs, each configurable to deliver the required current. The enable pins allow controlled power-up sequencing, preventing latch-up or excessive inrush current. The programmable switching frequency (1MHz to 3MHz) enables optimization for efficiency or component size, and the high efficiency reduces thermal stress in dense designs. This makes the LTC3370 a robust solution for high-performance computing platforms.
Recommended
Solid-State Drives (SSDs)
SSDs require multiple power rails for the controller, NAND flash, and DRAM, with tight voltage tolerances and high efficiency to manage thermal dissipation. The LTC3370EUH#PBF's four buck converters can supply these rails from a single 3.3V or 5V input. The configurable power stages allow designers to allocate current based on the specific SSD architecture, and the high efficiency reduces heat generation, improving reliability. The small 32-WFQFN package saves board space, which is critical in compact SSD form factors.
Recommended
Industrial Equipment
In industrial applications, the LTC3370EUH#PBF provides reliable multi-rail power from a 5V or 3.3V supply. Its wide operating temperature range (-40°C to +125°C) ensures performance in harsh environments. The programmable frequency allows designers to avoid EMI-sensitive frequency bands, and the current-mode control provides excellent line and load regulation. The device's robustness, including overcurrent protection and thermal shutdown, makes it suitable for factory automation, test equipment, and process control systems.
Recommended
Networking and Communication Equipment
Networking equipment such as routers, switches, and base stations require multiple low-voltage rails for processors, ASICs, and transceivers. The LTC3370EUH#PBF can generate these rails from a 5V backplane supply with high efficiency, reducing power consumption and heat. The configurable power stages allow flexible current allocation, and the enable pins enable sequenced startup to avoid inrush current. The programmable switching frequency helps minimize EMI, which is critical in communication systems. This makes the LTC3370 an excellent choice for powering high-speed digital logic.
Recommended
Automotive Electronics (Non-AEC-Q100)
While not AEC-Q100 qualified, the LTC3370EUH#PBF can be used in non-safety automotive applications such as infotainment systems, telematics, and body control modules. Its wide input range (2.25V to 5.5V) is compatible with automotive battery voltages (e.g., 3.3V, 5V rails). The high efficiency reduces heat in enclosed spaces, and the industrial temperature range (-40°C to +125°C) covers most automotive environments. The configurable outputs allow powering multiple loads, such as microcontrollers, sensors, and displays, from a single IC.
Recommended
Recommended Products Summary
Engineering reference data for LTC3370EUH#PBF — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LTC3370HUH#PBF | LTC3370IUH#PBF | LTC3370EUH#TRPBF |
|---|---|---|---|---|
| Package | 32-WFQFN Exposed Pad | 32-WFQFN Exposed Pad | 32-WFQFN Exposed Pad | 32-WFQFN Exposed Pad |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Output Current (Total) | 8A | 8A | 8A | 8A |
| Input Voltage Range | 2.25V to 5.5V | 2.25V to 5.5V | 2.25V to 5.5V | 2.25V to 5.5V |
| Output Voltage Range | 0.8V to 5.5V | 0.8V to 5.5V | 0.8V to 5.5V | 0.8V to 5.5V |
| Switching Frequency | 1MHz to 3MHz | 1MHz to 3MHz | 1MHz to 3MHz | 1MHz to 3MHz |
| Operating Temperature Range | -40°C to +125°C | -40°C to +150°C | -40°C to +125°C | -40°C to +125°C |
| Packaging | Tube | Tube | Tube | Tape & Reel |
Key Differentiators
- Configurable power stages (vs LTC3370HUH#PBF)
- Industrial temperature range (vs LTC3370HUH#PBF)
- Pb-free (RoHS compliant) (vs LTC3370EUH)
Design Notes
For optimal performance, place the LTC3370EUH#PBF close to the load and use short, wide traces for the switch nodes (SW1-SW4) to minimize parasitic inductance and resistance. The exposed pad must be soldered to a large copper area connected to ground to ensure proper heat dissipation. Use multiple vias to connect the exposed pad to the ground plane. Input and output capacitors should be placed as close as possible to the respective VIN and VOUT pins to reduce voltage spikes and improve transient response.
The LTC3370EUH#PBF can dissipate significant power when delivering high output currents. The 32-WFQFN package has a thermal resistance of approximately 28°C/W (theta_JA) with proper PCB layout. For example, at 8A total output with a 1V drop, power dissipation is 8W, causing a temperature rise of 224°C, which exceeds the maximum junction temperature. Therefore, ensure adequate copper area and airflow, or reduce the input-to-output voltage differential to keep the junction temperature within limits. Consider using a heatsink or forced cooling for high-power applications.
A common mistake is incorrect configuration of the C1-C3 pins, which determines the power stage allocation. Refer to the datasheet truth table to set these pins correctly for the desired output currents. Also, ensure the RT pin resistor is chosen to set the switching frequency within the specified range (1MHz to 3MHz). Do not leave the enable pins floating; tie them to VIN or use a controlled logic signal. Finally, verify that the input voltage does not exceed the absolute maximum rating of 5.5V, as this can damage the device.
Compliance Information
RoHS compliant per PBF suffix. Not AEC-Q100 qualified. REACH and conflict minerals status not specified in provided data.
