Inductor Built-in Inverting “micro DC/DC” Converters ("micro DC/DC")

The XCL301 series is a inverting micro DC/DC converter which integrates a P-channel FET, an inductor and a control IC in one tiny package (2.5mm×2.0mm, H=1.00mmMAX). A wide operating voltage range of 2.7V to 5.5V enables support for applications that require an internally fixed output voltage (-3.3V).

The XCL301 series uses automatic PFM/fixed off time PWM. In automatic PFM/fixed off time PWM control, the IC operates by PFM control when the load is light to achieve high efficiency over the full load range from light to heavy. The device provides a stable inverting power supply to be configured using only a SBD and two capacitors connected externally.

During stand-by, all circuits are shutdown to reduce current consumption to as low as 0.1μA(TYP) or less. With the built-in UVLO (Under Voltage Lock Out) function, the internal P-channel MOS driver transistor is forced OFF when input voltage becomes 2.2V or lower. The XCL301 integrate CL High Speed discharge function which enables the electric charge at the output capacitor CL to be discharged via the internal discharge.


Input Voltage Range2.7V~5.5V
Output Voltage-3.3V
Output Voltage accuracy±2.0%
Max. Output Current-50mA@VOUT=-3.3V, VIN=3.3V (TYP)
Internal Driver1.3Ω (Pch Driver Tr.)
Quiescent Current40μA (TYP.)
Control MethodsPFM / Fixed off time PWM Auto
Transient Response550mA
FunctionCurrent Limit
CL High Speed Discharge
Ceramic capacitor
Operating Ambient Temperature-40℃~+85℃
Environmentally FriendlyEU RoHS Compliant, Pb Free

Typical Application Circuit


Package Number of Pins Pcs/Reel Package Size(mm)
CL-2025-02 6 3,000 2.0 x 2.5 x 1.04

XCL301 Series Part Numbers

Part number Sample Package EDA Online Store
XCL301A331ER-G CL-2025-02

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