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How to drive battery-powered devices for a long time?

LDO regulators that reduced bias current drastically

Battery-powered IoT devices are increasingly required to be driven for longer time in addition to their increasingly high functionality.
To meet this requirement, not only on the battery side but also on the device side, it is necessary to reduce the average power consumption by making the standby (sleep) period as long as possible than the active period in which sensing and data communication are performed.
TCR3U series drastically reduces the bias current at no-load from the existing product. In addition, the circuit configuration is such that there is no sudden increase in the bias current seen in the existing product when the input voltage drops below the preset output voltage. On the other hand, it achieves superior load transient response performance despite its low current consumption, and it operates stably even with sudden changes in output current during active operation.

About the bias current


The bias current flows to the input of the LDO regulator when the output current doesn’t flow. It is required to operate the LDO regulator itself.
The output of the LDO regulator is used as a power supply for various functional blocks such as sensing and data communication. However, these functions don’t always operate and may not operate. Since little current flows to the LDO regulator output in this state, measures are taken to reduce the average current (power) consumption of the entire device by shortening the operating period as much as possible. At this time, only the bias current flows from the battery, so this characteristic is important to reduce the current consumption.
TCR3U series has succeeded in significantly reducing bias currents from existing products. In the region where the output current is lower than 20 μA, it is suppressed to 0.4 μA or less, contributing to power saving and long-time driving of the entire device.


In addition, TCR3U series has improved the load transient response characteristics compared to the existing product while reducing the bias current.
In general, reducing the bias current will deteriorate performance of the regulator. One of these is the load transient response, which indicates the magnitude of the fluctuation in the output voltage that occurs when the output current suddenly increases or decreases. While there is a trade-off relationship between the bias current and this property, TCR3UG series has successfully improved both by reviewing the circuit configuration and considering it in detail.


TCR3U series also features that the bias current does not increase when the input voltage drops below the preset output voltage due to a battery depletion etc. In such case, the bias current of the existing products increases rapidly, which causes battery consumption. However, TCR3U Series is designed to have a circuit configuration that prevents this phenomenon from occurring so that the battery life can be extended as much as possible.

Unless otherwise specified.
@VIN=VOUT+1 V (VOUT>1.5 V), VIN=2.5 V (VOUT≦1.5 V), IOUT=50 mA, CIN=1.0 μF, COUT=1.0 μF

Product Number

TCR3UM series


TCR3UG series


TCR3UF series


Data sheet

PDF (642 KB)

PDF (485 KB)

PDF (418 KB)


(Package code)





SMV (SOT-25)

SMV (SOT-25)

Size (mm) 1.0×1.0×0.60 0.645×0.645×0.33 2.9×2.8×1.1

Operating range

Output current (mA)

0 to 300

Output voltage (V)

0.8 to 5.0

Input voltage (V) 1.5 to 5.5

Electrical Characteristics

Bias Current (μA) Typ. @IOUT=0 mA


Dropout Voltage (mV) Typ.

@VOUT=3.3 V, IOUT=300 mA




Load Transient Response (mV) Typ.

@IOUT=1→50 mA




Load Transient Response (mV) Typ.

@IOUT=50→1 mA





Reference Design

LDO Regulator TCR3UG Series Application for Power Supply of IoT Devices