Specifications
| Attribute | Value |
| Supplier | Analog Devices Inc. |
| Package | Tube |
| ProductStatus | Obsolete |
| OutputType | Transistor Driver |
| Function | Step-Up/Step-Down |
| OutputConfiguration | Positive |
| Topology | Buck-Boost |
| NumberofOutputs | 2 |
| OutputPhases | 2 |
| Voltage-Supply(Vcc/Vdd) | 2.8V ~ 80V |
| Frequency-Switching | 100kHz ~ 400kHz |
| SynchronousRectifier | Yes |
| ClockSync | Yes |
| ControlFeatures | Enable, Frequency Control, Soft Start |
| OperatingTemperature | -40°C ~ 125°C |
| MountingType | Surface Mount |
| Package/Case | 38-WFQFN Exposed Pad |
Overview
Description
LT8705AEUHF is a high‑voltage, wide‑input‑range DC‑DC controller from Linear Technology (now Analog Devices). It’s designed to implement buck, boost, or buck‑boost converters using external MOSFETs, suitable for automotive, industrial, and battery‑charging power supplies. Features typically include fixed‑frequency current‑mode control, adjustable output via feedback, soft‑start, cycle‑by‑cycle current limit, protection (over/undervoltage, overcurrent), and optional remote sensing. The EUHF suffix denotes the package/to‑temperature rating (industrial/automotive). In short, it’s a versatile controller for robust, efficient regulation across a broad input range.
Features
Here are the key features of LT8705AEUHF (high-level):
- Wide input range up to ~60V for automotive/industrial use
- Bidirectional buck/boost power-path controller with reverse-current protection
- Synchronous operation driving external N-channel MOSFETs (high-side and low-side)
- Current-mode control with programmable peak current limit and slope compensation
- Programmable switching frequency (typical range around 100 kHz to 1 MHz)
- Soft-start and voltage tracking for stable startup and regulation
- Fault protection: overcurrent, overvoltage, undervoltage lockout, and thermal protection (with hiccup/retry)
- Fault reporting and status outputs (Power Good, fault indicators)
- Suitable for harsh environments with automotive/industrial temperature ranges
- Compact packaging suitable for compact power designs
Note: Exact specifications (e.g., precise voltage range, frequency range, pinout) vary by package/variant; consult the datasheet for the AEUHF version for exact numbers.
- Wide input range up to ~60V for automotive/industrial use
- Bidirectional buck/boost power-path controller with reverse-current protection
- Synchronous operation driving external N-channel MOSFETs (high-side and low-side)
- Current-mode control with programmable peak current limit and slope compensation
- Programmable switching frequency (typical range around 100 kHz to 1 MHz)
- Soft-start and voltage tracking for stable startup and regulation
- Fault protection: overcurrent, overvoltage, undervoltage lockout, and thermal protection (with hiccup/retry)
- Fault reporting and status outputs (Power Good, fault indicators)
- Suitable for harsh environments with automotive/industrial temperature ranges
- Compact packaging suitable for compact power designs
Note: Exact specifications (e.g., precise voltage range, frequency range, pinout) vary by package/variant; consult the datasheet for the AEUHF version for exact numbers.
Pinout
LT8705AEUHF is a 28-pin device (QFN package, EUHF suffix). Function: high‑voltage buck‑boost DC‑DC controller with integrated power MOSFETs for non-isolated power conversion (wide input range, current‑mode control, suitable for automotive/industrial applications).
Manufacturer
Manufacturer: Analog Devices, Inc. (AD) — the company behind the LT prefix (the Linear Technology line now part of Analog Devices).
What kind of company: A global American semiconductor company that designs and manufactures analog, mixed-signal, and power-management integrated circuits (and related signal processing products).
What kind of company: A global American semiconductor company that designs and manufactures analog, mixed-signal, and power-management integrated circuits (and related signal processing products).
Application
LT8705AEUHF is a high‑efficiency, 4‑switch buck‑boost controller with integrated MOSFETs for wide‑input DC‑DC regulation. Typical applications:
- Automotive power electronics (12/24V systems; load‑dump tolerant buck/boost)
- Renewable energy and battery charging (PV/battery charger with buck/boost regulation)
- Industrial and telecom power modules (48V/24V input to lower rails)
- Portable/battery‑powered equipment (wide Vin to stable Vout)
- USB‑C PD front‑end and battery‑charger implementations needing buck/boost operation
- Automotive power electronics (12/24V systems; load‑dump tolerant buck/boost)
- Renewable energy and battery charging (PV/battery charger with buck/boost regulation)
- Industrial and telecom power modules (48V/24V input to lower rails)
- Portable/battery‑powered equipment (wide Vin to stable Vout)
- USB‑C PD front‑end and battery‑charger implementations needing buck/boost operation
Package
LT8705AEUHF is in a 28‑pin QFN package (4×4 mm) with an exposed pad.
