SQ27406XNQ

High Efficiency, 36V Input, 6A Synchronous Step Down Regulator

SQ27406XNQ High Efficiency, 36V Input, 6A Synchronous Step Down Regulator Datasheet

Parameters
Features
Description

Part number	SQ27406XNQ
Channel(#)	1
Vin (min) (V)	4
Vin (max) (V)	36
Switching frequency (min)(kHz)	300
Switching frequency (max)(kHz)	2200
Vout (min) (V)	1
Vout (max) (V)	33.84
Iout (max) (A)	6
Vout2 (min)(V)
Vout2 (max )(V)
Iout2 (max)(A)
Vref accuracy (±%)	6
Vout accuracy(±%)
Control mode	Peak current control
Duty cycle (max)(%)	94
Operation mode	PFM/FCCM
Iq (typ) (uA)	30
Features	Enable,Power good,Auto-discharge,Fixed soft-start,Low Iq,Thermal shutdown,UVP with hiccup,Ouput OVP,External bias input,Low shutdown current,Adjustable frequency setting,Spread spectrum,Cycle by cycle overcurrent protection,Precise Ref accuracy,Synchronize to external clock,Internal compenstation,Pre-bias startup
Package	QFN3.5×4-14
Operating temperature range(°C)	-40 to 125
Functional safety category

• 4V to 36V Input Voltage Range

• 6A Output Current Capability

• Low RDS(ON) for Internal MOSFETs: 41mΩ Top, 21mΩ Bottom

• 30µA Quiescent Current (Typical)

• 1µA Shutdown Current (Typical)

• 300kHz to 2.2MHz Switching Frequency

• Synchronization to External Clock

• Spread Spectrum Function

• Hiccup Mode Output Short-Circuit Protection

• EN On/Off Control with Accurate Threshold

• Cycle-by-Cycle Peak Current Limit

• Power Good Indicator

• 1V ±1% Reference Voltage Over -40˚C to 125˚C Temperature Range

• Package:QFN3.5×4-14

The SQ27406 is a high efficiency synchronous step-down DC-DC regulator with internal power and synchronous rectifier MOSFETs. It operates using fixed frequency and peak current control over a wide input voltage range of 4V to 36V, and can deliver up to 6A of continuous output current.

The SQ27406 is specially designed with a symmetric QFN package and adjustable LX rise time to achieve good EMI performance. The switching frequency can be adjusted from 300kHz to 2.2MHz, or synchronized to an external clock. The frequency can be selected to meet application EMI limits and to avoid noise in important frequency bands.

The SQ27406 offers excellent efficiency over a wide range of applications by providing internal 41mΩ power and 21mΩ synchronous rectifier MOSFETs, frequency reduction at light load conditions, and an external bias input. The 1μA shutdown supply current allows the device to be used in battery powered applications. The SQ27406 ensures safe operation in all operating conditions, providing cycle-by-cycle current limit, input undervoltage lockout, internal soft-start, output undervoltage and overvoltage protection, and thermal shutdown.

The SQ27406 is available in a QFN 3.5mm×4mm-14 pin package.

Evaluation Board

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Photo of evaluation board
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Photo of evaluation board

EVB_SQ27406XNQ

EVB File

The EVB_SQ27406XNQ is intended for high efficiency, 36V Input, 6A synchronous step-down regulator.

Technical Documentation

Title	Date
Silergy_Catalog_Q2_2026	2026-06-12