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LT8611IUDD

Name: LT8611IUDD
Rating: 4.7 (12 reviews)

IC REG BUCK ADJ 2.5A 24QFN

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Mfr。パート #LT8611IUDD
パッケージ WFQFN-24
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仕様

Package	Tube
ProductStatus	Obsolete
Function	Step-Down
OutputConfiguration	Positive
Topology	Buck
OutputType	Adjustable
NumberofOutputs	1
Voltage-Input(Min)	3.4V
Voltage-Input(Max)	42V
Voltage-Output(Min/Fixed)	0.97V
Voltage-Output(Max)	40V
Current-Output	2.5A
Frequency-Switching	200kHz ~ 2.2MHz
SynchronousRectifier	Yes
OperatingTemperature	-40°C ~ 125°C (TJ)
MountingType	Surface Mount
Package/Case	24-WFQFN Exposed Pad

概要

Description

LT8611IUDD is a wide-input, high-efficiency DC-DC regulator from Linear Technology (now Analog Devices). It’s designed for buck-boost operation, meaning it can regulate a stable output even when the input voltage can be higher or lower than the desired output. The device supports a broad input range and uses current‑mode control with protections and features typical of modern regulators.
Key points:
- Wide input range; suitable for automotive, battery-powered, and industrial applications
- Buck-boost topology to maintain a constant output
- Features such as soft-start, enable control, and protection (overcurrent/thermal/UVLO)
- Offered in an 8-pin UDD package with appropriate external components
Where to find specifics:
- For exact input/output voltage ranges, efficiency, current limits, soft-start timing, and pinout, consult the LT8611IUDD datasheet and related application notes from Analog Devices.

Features

LT8611IUDD Features (concise)
- Wide input range suitable for automotive/industrial (up to ~75 V).
- Buck-boost topology: regulates output whether Vin is above or below Vout.
- Synchronous design (external N-channel MOSFETs) for high efficiency.
- Fast, high-performance control with good transient response.
- Programmable output voltage via external resistor divider.
- Protective functions: overcurrent/short‑circuit with hiccup, over‑temperature shutdown.
- Input undervoltage lockout and enable/shutdown control.
- Suitable for light-load efficiency with flexible operation modes.
- Industrial temperature variant available (-40 °C to 125 °C).
- Designed for compact, high-voltage DC/DC applications (automotive, industrial).

Package

The LT8611IUDD is supplied in a 20-lead, 4 mm × 4 mm QFN package (UDD).

Pinout

Pin count: 12 pins (UDD 3 × 3 mm package).
Function: a synchronous monolithic step-down (buck) switching regulator IC — integrates high‑ and low‑side MOSFETs to convert a higher DC input to a regulated lower DC output. Typical pins include VIN, SW (switch/node), GND, FB (feedback), EN (enable), INTVCC/BOOT (internal/regulator/driver supply), COMP/MODE and associated sense/decoupling pins.

Manufacturer

Manufacturer: Analog Devices, Inc. (the LT8611 family was originally from Linear Technology; Linear was acquired by Analog Devices in 2017).
What kind of company: Analog Devices is a multinational semiconductor company that designs and manufactures high-performance analog, mixed-signal and digital signal processing integrated circuits, including power-management, data-converter, and amplifier ICs.

Application

LT8611IUDD is a high‑efficiency synchronous buck‑boost regulator. Typical applications include:
- Automotive and industrial DC‑DC power supplies (wide input to regulated rails)
- Battery‑powered/portable devices with fluctuating input
- Solar/battery‑backup (UPS) front ends
- Telecom/data‑communications power rails
- Distributed/point‑of‑load converters and buck‑boost chargers from wide sources

Equivalent

There is no guaranteed pin‑for‑pin, drop‑in equivalent for the LT8611IUDD. To replace it, match VIN range, max output current, switching frequency, efficiency and package. Look for synchronous buck regulators from Analog Devices (LT family), TI, Maxim, or ON Semi with the same specs, or use manufacturer parametric searches to find close equivalents.