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Compact and Low-Noise LDO Regulators that Provide Fast Response from Standby to Stabilize DC Power Line
Toshiba Electronic Devices & Storage Corporation ("Toshiba") has launched the TCR5FM series of 35 LDO regulators, which help stabilize the DC power line for small equipment, such as mobile devices and wearable devices.
In recent years, wearable devices have been expected to deliver high performance while maintaining long battery life. This has led to a trend of alternating between low-power operation and high-speed processing. Switching between these operating modes can destabilize the power supply line. Therefore, LDO regulators that contribute to stabilizing DC power line are in demand.
The new TCR5FM series improves load transient response from standby by approximately 80%[1] compared to Toshiba’s existing product, the TCR3RM series, by quickly detecting fluctuations in output voltage and providing fast feedback. As a result, even during sudden load changes, variations in output voltage are reduced. The TCR5FM series features a high ripple rejection ratio[2] of 91dB (typ.)[3], which is top class in the industry[4], achieved by combining a bandgap circuit, a low-pass filter[5], and a high-speed, low-noise operational amplifier. This enhances noise rejection capability and enables the output of a low-noise voltage. Due to these features, the new TCR5FM series helps stabilize DC power lines and is suitable for noise-sensitive applications such as CMOS sensors and power supplies for high-frequency circuits.
The maximum output current is 500mA and operating temperature range supports up to 125°C. The line-up includes 35 products, and the output voltages range from 0.9V to 5.0V, allowing users to select the output voltage suited to their applications.
The package is a small DFN4D package, 1mm×1mm, suitable for mobile devices and wearable devices requiring high-density mounting.
Toshiba will continue to expand its lineup of LDO regulator series and promote product development to meet diverse customer needs.
Notes:
[1] Values measured by Toshiba. Test condition: VIN=3.3V, VOUT=2.8V, IOUT=0mA ⇔ 100mA, tr=1.0μs, tf=1.0μs, Ta=25°C
[2] Ripple rejection ratio, also referred to as PSRR (Power Supply Rejection Ratio), is a quantitative index that indicates how much ripple voltage component (noise) superimposed on the input voltage is transmitted to the output voltage. It is expressed as the ratio between the input ripple voltage and the resulting output ripple voltage.
[3] Values measured by Toshiba. Test condition: CIN=none, COUT=1.0μF, VIN=3.3V, VOUT=2.8V, VIN Ripple=200mVp-p, IOUT=10mA, Ta=25°C
[4] Among LDO regulators with a maximum output of 500mA, Toshiba surveyed as of October 2025.
[5] A filter that allows only low-frequency components to pass through while blocking high-frequency components.
Features
- Fast load transient response: ΔVOUT=-75/+25mV (typ.) (IOUT=0mA ⇔ 100mA, VOUT=2.8V)
- High ripple rejection ratio: R.R.=91dB (typ.) (f=1kHz, VOUT=2.8V)
- Low output noise voltage: VNO=5μVrms (typ.) (10Hz≦f≦100kHz)
Features Explanation
1. Fast load transient response: ΔVOUT=-75/+25mV (typ.) (IOUT=0mA ⇔ 100mA, VOUT=2.8V)
The TCR5FM series offers fast response performance to sudden load changes. Compared to Toshiba’s existing product, the TCR3RM series, the response from no-load conditions (standby) has improved by approximately 80%[1], with a typical load transient response of -75mV/+25mV at 2.8V output for a 0mA ⇔ 100mA load change. It also delivers excellent response under loaded conditions, with a typical load transient response of -60mV/+40mV at 2.8V output for a 1mA ⇔ 500mA load change. This contributes to the stable operation of the downstream circuit.
Figure 1. Comparison of Load Transient Response Characteristics between Existing and New Products
(VIN=3.3V, VOUT=2.8V, IOUT=0mA ⇔ 100mA, tr=1.0μs, tf=1.0μs, Ta=25°C)
2. High ripple rejection ratio: R.R.=91dB (typ.) (f=1kHz, VOUT=2.8V)
The ripple rejection ratio indicates the ratio between the ripple voltage component superimposed on the input voltage and the ripple voltage that appears on the output voltage. The TCR5FM series achieves high ripple rejection by combining a bandgap circuit, a low-pass filter[5], and a high-speed, low-noise operational amplifier. The TCR5FM series delivers top class performance in the industry[4], with a ripple rejection ratio of 91dB (typ.) (f=1kHz) using a 3.3V input and 2.8V output. This enables low-noise output.
Figure 2. Characteristic of ripple compression ratio
(CIN=none, COUT=1.0μF, VIN=3.3V, VOUT=2.8V, VIN Ripple=200mVp-p, IOUT=10mA, Ta=25°C)
3. Low output noise voltage: VNO=5μVrms (typ.) (10Hz≦f≦100kHz)
Output noise voltage refers to the integrated value of noise occurring in the output voltage of the LDO. TCR5FM series features industry-leading[2] performance, 5μVrms (typ.) (10Hz≦f≦100kHz) with 3.3V input, 2.8V output. This allows for low-noise output. The new TCR5FM series is suitable for noise-sensitive applications such as high-sensitivity analog circuits, RF circuits, and sensor power supplies.
Figure 3. Characteristic of output noise
(CIN=1.0μF, COUT=1.0μF, VIN=3.3V, VOUT=2.8V, IOUT=10mA, Ta=25°C)
Applications
- Mobile devices, wearable devices, IoT devices, etc.
Main Specifications
| Part number | TCR5FM series | ||
|---|---|---|---|
| Package | Name | DFN4D | |
| Size (mm) | Typ. | 1.0×1.0, t=0.37 | |
| Operating range (Topr=-40 to 125°C) |
Output current IOUT (mA) | 500 | |
| Input voltage VIN (V) | 1.55 to 5.5[6] | ||
| Output voltage VOUT (V) | 0.9 to 5.0 | ||
| Electrical characteristics (Unless otherwise specified, Tj=25°C) |
Quiescent current IB(ON) (µA) IOUT=0mA[7] |
Typ. | 10 |
| Max | 20[8] | ||
| Drop-out voltage VDO (mV)[9] IOUT=500mA, VOUT=2.8V |
Typ. | 220 | |
| Max | 337[8] | ||
| Load transient response ⊿VOUT (mV) IOUT=1mA ⇔ 500mA, VOUT=2.8V |
Typ. | -60/+40 | |
| Load transient response ⊿VOUT (mV) IOUT=0mA ⇔ 100mA, VOUT=2.8V |
Typ. | -75/+25 | |
| Ripple rejection ratio R.R. (dB) f=1kHz, IOUT=10mA, VOUT=2.8V |
Typ. | 91 | |
| Output noise voltage VNO (µVrms) VOUT=2.8V, IOUT=10mA, 10Hz≦f≦100kHz |
Typ. | 5 | |
| Control pin voltage (HIGH) VCTH (V) | Min | 0.79[8] | |
| Control pin voltage (LOW) VCTL (V) | Max | 0.4[8] | |
| Sample check & availability |  |
||
Notes:
[6] Please refer to the dropout voltage table for each output voltage listed in the datasheet and use within the absolute maximum junction temperature and operating temperature ranges.
[7] Control terminal current (ICT) is not included.
[8] Tj=-40 to 125°C
[9] VDO=VIN1-(VOUT1×0.97)
VOUT1 is the output voltage when VIN=VOUT+0.5V.
VIN1 is the input voltage at which the output voltage becomes 97% of VOUT1 after gradually decreasing the input voltage.
Related information
Product information
Low-Dropout Regulators
Technical articles
Noise reduction due to high ripple rejection ratio
LDO Regulators: Fast load transient response performance
LDO Regulators: Reduction of power consumption by low dropout voltage
Application notes
Basics of Low-Dropout (LDO) Regulator ICs (PDF: 1.3MB)
Concept of self-heating of LDOs and selection guide (PDF: 767KB)
Load Transient Response of LDO and Methods to Improve it (PDF: 1.2MB)
Simple Guide to Improving Ripple Rejection Ratio of LDO Regulators (PDF: 1.3MB)
Application examples of LDO regulators with high ripple rejection and fast load transient response (PDF: 684KB)
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