XCL233 Ultra-Low Power Step-Down Micro DC/DC with VSET


The XCL233 is an ultra-low power step-down Micro DC/DC with integrated coil & VSET.

With a quiescent current of only 200 nA, this Micro DC/DC converter is one of the lowest in its class. Coupled with an efficiency which remains at above 80% even at outputs as low as 0.01 mA, the XCL233 is ideal for designs requiring long battery life. The output voltage select function (VSET) enables two separate voltages to be pre-selected.

Delivered in a package measuring only 2.5 mm x 2.0 mm, the XCL233 is the ultimate PCB space saving solution and this small size together with the low power consumption, makes it the perfect choice for battery-powered designs in applications such as wearables, smart meters and sensor modules.



  • Ultra-Low Power
    • 200nA Quiescent Current

  • VSET Function
    • 2 Pre-set VOUT Voltages Selectable

  • Long Battery Life
    • High Efficiency even at low load current

  • Utra-Small Solution
    • Designed to save PCB space with a small package size and a total mounting area of only 7.56mm2

Typical Application Circuit




Input Voltage Range:

1.8 V ~ 6.0 V (abs. max 7 V)

Output Voltage Range:

0.5 V ~ 1.9 V (50mV steps)
2.0 V~3.6 V (100mV steps)

VOUT Accuracy:

±20 mV (VOUT≦1.0V)
±2.0% (VOUT>1.0V)

Output Current:


Quiescent Current:

200nA @ VOUT=1.8V


86% (VIN=3.6V, VOUT=1.8V, IOUT=10mA)

Control Methods:



CL Discharge (D Type)

UVLO function

VSET with 2 pre-set voltages

Protection Functions:

Short Protection

Operating Temperature Range: -40 °C ~ +85 °C


CL-2025-03 (2.5 x 2.0 x 1.04 mm)


Maximise Battery Life


Select two different output voltages for power sleep mode and active mode using the VSET function

VIN=3.0V ~ 4.2V  →  VOUT=1.8V

              XCL233  →  VOUT=1.8V (Active) / 1.1V (Sleep)

IOUT (Active)    =10mA @1ms

IOUT (Sleep)    =10µA @10s

XCL233 VSET Function


Efficiency vs. Output Current Comparison

At 200 nA the XCL233 has the lowest quiescent current in our Micro DC/DC range.

From sleep state to full operation of the MCU or SoC, power is supplied with high efficiency across the full load range.

As shown in the graph on the right there is significant benefit in efficiency when comparing the XCL233 to a conventional buck Micro DC/DC at low levels of output current.

Combining the very low quiescent current with high levels of efficiency at low loads makes the XCL233 unrivalled in reducing the impact on battery life:


Ultra-Compact Design

The XCL233 has been designed with PCB space saving in mind, integrating the Coil and DC/DC Converter IC into a 2.0 mm x 2.5 mm package with a maximum height of 1.04 mm.

The total mounting area for the Micro DC/DC Converter, including external capacitors, is only 7.56 mm2, smaller than similar products from leading competitors.



Evaluation Boards Now Available