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Small, surface mount LDO regulators that allow long and stable operation of IoT equipment and wearable devices: TCR3UM series

Product News 2018-08

The package photograph of small, surface mount LDO regulators that allow long and stable operation of IoT equipment and wearable devices: TCR3UM series.

Toshiba Electronic Devices & Storage Corporation ("Toshiba") has launched 36 LDO regulator products under the "TCR3UM series", which are packed in the general purpose DFN4 package[1], for IoT equipment and wearable devices that feature low consumption current. The products are small, surface mount LDO regulators with 300 mA output (max) using state of the art CMOS process.

Electronics devices such as communication devices are increasingly equipped with coin or lithium-ion batteries. Mobile devices such as smart phones and tablets consume large current and are expected to be frequently charged. On the other hand, IoT sensors sending temperature or flow rate data used in agricultural or industrial equipment and wearable devices equipped with communication functions are required to operate long hours with less frequent battery charging or replacement, and also require stable and precise power supplies. Therefore, LDO regulators used as power supply ICs are also required to feature low consumption current allowing long time operation under low power as well as stable output voltage.
To meet such demand, Toshiba started mass production of our TCR3UG series products in September 2017. Our TCR3UG series products use the small and thin WCSP4F package[2], as well as achieve the industry’s best[3] trade-off between low consumption current characteristics and high ripple rejection ratio and high speed load transient response. In addition, TCR3UM series products using the general-purpose DFN4 package[1] have been released this time.

The new TCR3UM series products allow longer time battery drive and stable operation of sensors and CPUs that are susceptible to voltage fluctuation such as noise. They also incorporate protection functions such as overheat protection, overcurrent protection and rush current suppression. 36 products with output voltages which ranges from 0.8 V to 5.0 V have been mass-produced, allowing product selection depending on the applications.

[1] General purpose DFN4 package: 1.0×1.0 mm (typ.), t=0.60 mm (max)
[2] Small and thin WCSP4F package: 0.645×0.645 mm (typ.), t=0.33 mm (max)
[3] By an output current 300 mA LDO regulator, as of July 10, 2018, from a survey by Toshiba.


  • Low consumption current (Low quiescent current): IB(ON1)=0.34 μA (typ.)
  • High ripple rejection ratio, high speed road transient response: R.R.=70 dB (typ.), ⊿VOUT= -51/+36 mV (typ.)
  • General-purpose DFN4 package: 1.0×1.0 mm (typ.), t=0.60 mm (max)


  • IoT equipment
  • Wearable devices
  • Smart phones

Product Specifications

Part number TCR3UM series[5] TCR3UG series
Package Name The package photograph of DFN4.
The package photograph of WCSP4F.
Size typ.  (mm) 1.0×1.0,
t=0.60 (max)
t=0.33 (max)
Operating ranges Output current  IOUT max  (mA) 300 300
Output voltage  VOUT  (V) 0.8 to 5.0 0.8 to 5.0
Input voltage  VIN  (V)
@IOUT=1 mA
1.5 to 5.5 1.5 to 5.5
Operating temperature  Topr  (°C) -40 to 85 -40 to 85
(Unless otherwise
specified, @Tj=25 °C)
Quiescent current  IB(ON1) typ.  (μA)
@VOUT≤1.5 V, IOUT=0 mA[4]
0.34 0.34
Ripple rejection ratio  R.R. typ.  (dB)
@VRipple=200 mVp-p,
IOUT=10 mA, f=1 kHz,
Ta=25 °C[4]
70 70
Drop-out voltage  VDO typ.  (mV)
@VOUT=3.3 V, IOUT=300 mA[4]
196 140
Load transient response  ⊿VOUT typ.  (mV)
@VOUT=0.8 V, VIN=3.3 V,
IOUT=1→50 mA/50→1 mA[4]
-51/+36 -60/+60

[4] Common test conditions: 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
[5] New products


TCR3UM series[5]

No. Output voltage
Auto-discharge No. Output voltage
Yes Yes
1 0.8 TCR3UM08A 19 1.9 TCR3UM19A
2 0.85 TCR3UM085A 20 2.5 TCR3UM25A
3 0.9 TCR3UM09A 21 2.6 TCR3UM26A
4 0.95 TCR3UM095A 22 2.7 TCR3UM27A
5 1.0 TCR3UM10A 23 2.8 TCR3UM28A
6 1.05 TCR3UM105A 24 2.85 TCR3UM285A
7 1.1 TCR3UM11A 25 2.9 TCR3UM29A
8 1.15 TCR3UM115A 26 2.925 TCR3UM2925A
9 1.2 TCR3UM12A 27 3.0 TCR3UM30A
10 1.3 TCR3UM13A 28 3.1 TCR3UM31A
11 1.35 TCR3UM135A 29 3.2 TCR3UM32A
12 1.4 TCR3UM14A 30 3.3 TCR3UM33A
13 1.5 TCR3UM15A 31 3.5 TCR3UM35A
14 1.6 TCR3UM16A 32 3.6 TCR3UM36A
15 1.75 TCR3UM175A 33 4.1 TCR3UM41A
16 1.8 TCR3UM18A 34 4.2 TCR3UM42A
17 1.825 TCR3UM1825A 35 4.5 TCR3UM45A
18 1.85 TCR3UM185A 36 5.0 TCR3UM50A

TCR3UG series

No. Output voltage
Auto-discharge No. Output voltage
Yes No Yes No
1 0.8 TCR3UG08A TCR3UG08B 17 2.5 TCR3UG25A TCR3UG25B
2 0.85 TCR3UG085A TCR3UG085B 18 2.6 TCR3UG26A TCR3UG26B
3 0.9 TCR3UG09A TCR3UG09B 19 2.7 TCR3UG27A TCR3UG27B
4 0.95 TCR3UG095A TCR3UG095B 20 2.8 TCR3UG28A TCR3UG28B
5 1.0 TCR3UG10A TCR3UG10B 21 2.85 TCR3UG285A TCR3UG285B
6 1.05 TCR3UG105A TCR3UG105B 22 3.0 TCR3UG30A TCR3UG30B
7 1.1 TCR3UG11A TCR3UG11B 23 3.1 TCR3UG31A TCR3UG31B
8 1.15 TCR3UG115A TCR3UG115B 24 3.2 TCR3UG32A TCR3UG32B
9 1.2 TCR3UG12A TCR3UG12B 25 3.3 TCR3UG33A TCR3UG33B
10 1.3 TCR3UG13A TCR3UG13B 26 3.5 TCR3UG35A TCR3UG35B
11 1.35 TCR3UG135A TCR3UG135B 27 3.6 TCR3UG36A TCR3UG36B
12 1.5 TCR3UG15A TCR3UG15B 28 4.1 TCR3UG41A TCR3UG41B
13 1.75 TCR3UG175A TCR3UG175B 29 4.2 TCR3UG42A TCR3UG42B
14 1.8 TCR3UG18A TCR3UG18B 30 4.5 TCR3UG45A TCR3UG45B
15 1.85 TCR3UG185A TCR3UG185B 31 5.0 TCR3UG50A TCR3UG50B
16 1.9 TCR3UG19A TCR3UG19B - - - -

Pin Assignment and Application Circuit Example

The illustration of pin assignment and application circuit example of small, surface mount LDO regulators that allow long and stable operation of IoT equipment and wearable devices: TCR3UM series.

The application circuits shown in this document are provided for reference purposes only. Thorough evaluation is required, especially at the mass-production design stage. Toshiba Electronic Devices & Storage Corporation does not grant any license to any industrial property rights by providing these examples of application circuits.

Information in this document, including product prices and specifications, content of services and contact information, is correct on the date of the announcement but is subject to change without prior notice.

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