Toshiba TCR15AG Series User manual

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LDO Regulator TCR15AG
(fixed output voltage type)
Application & Circuit
Reference Guide
RD030-RGUIDE-02

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Toshiba Electronic Devices & Storage Corporation
Table of Contents
1. OVERVIEW .............................................................................................................. 3
1.1. Target applications ............................................................................................... 4
2. APPLICATION CIRCUIT EXAMPLE AND BILL OF MATERIALS ..................................... 5
2.1. Application circuit example ................................................................................... 5
2.2. Bill of materials..................................................................................................... 5
3. MAJOR FEATURES OF THE TCR15AG SERIES ............................................................ 6
3.1. VBIAS pin................................................................................................................ 6
3.2. Achieving a high PSRR and the influence of an output capacitor on the PSRR ........ 9
3.3. Achieving a fast high-load transient response ......................................................10
4. OUTPUT VOLTAGE...................................................................................................12
5. DESIGN CONSIDERATIONS .....................................................................................14
6. PRODUCT OVERVIEW..............................................................................................15
6.1. TCR15AG (fixed voltage type) ..............................................................................15
6.1.1. Overview ..............................................................................................................15
6.1.2. External view and pin assignment .......................................................................15
6.1.3. Internal block diagram ........................................................................................17
6.1.4. Pin description ....................................................................................................17

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1. Overview
For the purpose of requiring low power consumption application, it is general that average power
consumption goes down balancing total system utilization and supplying power. Especially
smartphone and tablet, there is a trade-off between the size and weight of the device and their
battery capacity while a high level of power management is necessary, but in the application there
are various electronic circuits including wireless communication, camera, display, audio, and storage
circuits, so it is necessary to control their power supplies surely.
Power management ICs (PMICs) are used in smartphones, tablets, and other small battery-
operated devices to achieve accurate power management. A PMIC consists of a few to a few dozen
power supply channels of DC-DC converters and low-dropout (LDO) regulators, and a controller to
control the on/off of each power supply and output according to commands from a main system-
on-a-chip (SoC). PMICs specifically designed for smartphone and tablet applications, are constrained
by size limits. Therefore, the power supply ICs integrated in some of these PMICs do not compare
favorably with discrete power supply ICs in terms of performance. The power supplies from a PMIC
might not satisfy system requirements, depending on the loads (ICs and modules) that they serve.
In addition, mobile devices with wireless communication capabilities might generate electromagnetic
interference (EMI) that affects bad impact to not only the communication quality but also internal
power supply circuits. PMICs are generally designed for applications that are not subject to frequent
remodeling. However, smartphones are upgraded frequently to add new features and improve
performance, and each upgrade entails changes to the specifications of internal circuits. It is
therefore impractical to rely on a single PMIC for the power management of all the internal circuits
from the viewpoints of both system design and PMIC design.
In addition, with the global uptake of the LTE wireless standard, many smartphone users now
share photographs and movies on SNS. This is driving substantial improvement in the performance
of smartphone cameras, which have a CMOS image sensor with low power consumption and high
read speed. Generally, it is necessary to supply different voltages to the sensor, core (control) and
I/O sections of a CMOS image sensor. The digital core of a CMOS image sensor that processes data
at high speed tends to consume a lot of power. Nowadays, the digital core is designed to operate at
a very low voltage (around 1 V) to reduce power consumption. In order to accommodate the
decreasing voltage and increasing current consumption, the power supply for the digital core needs
to have excellent AC characteristics, including a high power supply rejection ratio (PSRR) and a fast
load transient response, while providing a high current drive capability. Ultra-small packaging is also
an important factor for space-critical designs like smartphones.
In addition to the VIN input, Toshiba’s LDO regulators of the TCR15AG series have a separate power
supply for the output circuit in order to achieve low dropout voltage and thus stable voltage
regulation even at low input voltage. The TCR15AG series provides outstanding PSRR and load
transient response required for CMOS image sensors for smartphone applications. In addition, the
TCR15AG series offers 46 LDO regulators with a fixed output voltage from 0.65V to 3.6V to meet a
wide range of application requirements. While providing accurate voltage regulation, all the LDO
regulators of the TCR15AG series are available in an ultra-small, thin-profile WCSP package.

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Furthermore, the TCR15AG series has a drive capability of up to 1.5 A and thus meets the current
requirement of CMOS image sensors, and provides overcurrent protection, thermal shutdown, inrush
current limiting, undervoltage lockout, and auto output discharge.
This reference guide uses the TCR15AG (fixed voltage type) LDO regulator as an example to
describe the major features and characteristics of the TCR15AG series. For details of other features
and functions of the TCR15AG series, see datasheet.
To download the datasheet for the TCR15AG series →
1.1. Target applications
●Power supply circuits for CMOS image sensors and RF blocks/modules for smartphone
applications
Click Here

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2. Application circuit example and bill of materials
2.1. Application circuit example
Figure 2.1 shows an example of a circuit using the TCR15AG (fixed voltage type) LDO regulator.
Figure 2.1 Example of a circuit using the TCR15AG (fixed voltage type) LDO regulator
2.2. Bill of materials
Table 2.1 Bill of materials
No. Ref. Qty Value Part Number
Manufacturer
Description Packaging
Typical
Dimensions
mm (inches)
1 IC1 1 ―
TCR15AG
(fixed voltage
type)
TOSHIBA WCSP6F 1.2 x 0.8
2 C1
(CBIAS
)
1 1.0μF Ceramic, 10V, ±10% ―
1.0 x 0.5
(0402)
3C2
(CIN) 1 4.7μF Ceramic, 10V, ±10% ―
1.6 x 0.8
(0603)
4 C3
(COUT)
1 4.7μF Ceramic, 10V, ±10% ―
1.6 x 0.8
(0603)
VBIAS voltage conditions:
VOUT ≦1.1V 2.5 to 5.5V
VOUT ＞1.1V VOUT+1.4 to 5.5V
VIN and VBAIS can be connected together if they meet the above

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3. Major features of the TCR15AG series
Fabricated using a CMOS process, the LDO regulators of the TCR15AG series feature low current
consumption and small size. With small process geometries, the output device of the TCR15AG series
has low on-resistance and thus a low input-output voltage differential (i.e., dropout voltage). LDO
regulators with a low dropout voltage help reduce the thermal loss and increase the running time of
battery-operated devices.
The TCR15AG series has a bias voltage input (VBIAS) separate from the VIN input, making it possible
to reduce dropout voltage to a level lower than that achievable with the conventional CMOS process.
Due to this circuit configuration, the TCR15AG series provides much lower dropout voltage than
typical CMOS LDO regulators and thus helps reduce thermal loss. As a result, despite the ultra-small
WCSP package, the TCR15AG series has a current drive capability of 1.5A. Being independent of the
VIN input of the LDO regulator, the VBIAS pin helps the TCR15AG series achieves stable voltage
regulation, even in the low input voltage region, without being affected by VIN. The output voltage
is as low as 0.65V. The following subsections show the unique characteristics of the TCR15AG series
derived from the VBIAS pin.
3.1. VBIAS pin
Figure 3.1 shows a conventional LDO regulator. Operating with a power supply from VIN, this LDO
regulator drives the gate of an internal P-channel MOSFET with VIN to provide an output voltage.
Consequently, when VIN is low, the MOSFET gate voltage decreases to a level that makes it
impossible for the LDO regulator to maintain a regulated output voltage. Even when a low output
voltage is necessary, a conventional LDO regulator is restricted by the lower limit of input operating
voltage range specified in the datasheet. Therefore, despite the superior low-dropout advantage,
conventional LDO regulators are not well suited for applications requiring a regulated low-voltage
supply.
By way of comparison, Figure 3.2 shows the internal configuration of the TCR15AG series, which
drives the gate of an internal MOSFET with a power supply from the VBIAS pin. Being independent
of the VIN input, the VBIAS pin provides several benefits. First, this configuration allows the use of
an N-channel MOSFET. Since it is easier to reduce the on-resistance of the N-channel MOSFET than
that of the P-channel MOSFET, the use of an N-channel MOSFET makes it possible to reduce dropout
voltage. This, in turn, helps reduce power loss and therefore achieve a high-current drive capability.
Second, the LDO regulator can operate at a low input voltage irrespective of VIN and provides a
regulated low output voltage with minimum power loss. Next, let’s look at the changes in
characteristics over a range of voltage applied to the VBIAS pin.

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Figure 3.1 Gate voltage supply of the internal MOSFET of an LDO regulator without the VBIAS
pin
Figure 3.2 Gate voltage supply of the internal MOSFET of an LDO regulator with the VBIAS pin
Figure 3.3 VOUT-IOUT curve with different VBIAS voltages
低RON 化
Voltage supply
Voltage supply
Low Ron

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Figure 3.3 shows the VOUT-IOUT curves of the TCR15AG12 (VOUT=1.2V) at different VBIAS voltages.
As shown in Figure 3.3, when the VBIAS pin is 3.3V or higher, the TCR15AG12 maintains low-dropout
performance over the entire output current range of up to 1.5A. The minimum VBIAS voltage shown
in the datasheet is a voltage at which the functional operation of the TCR15AG12 is guaranteed
under the specified test conditions. Care should be taken as to variations in performance depending
on the VBIAS voltage. The minimum VBIAS voltage specified in the datasheet is 2.6V when VOUT =1.2V.
The dashed curve shows the VOUT-IOUT characteristics when VBIAS=2.6V. In contrast, the solid line
shows the VOUT-IOUT performance when VBIAS=3.3V. Compared to the solid line, the VOUT-IOUT curve
at VBIAS =2.6V begins to decline at an IOUT around 0.5A. Therefore, for systems requiring a current
of 0.5A or more, a 3.3V or higher power supply should be applied to the VBIAS pin. However, this
causes some design concerns. For example, depending on the system configuration, a long power
supply line might need to run around a board, making it susceptible to noise. Another concern is
that a system might be unable to supply enough power to the VBIAS pin. Generally, the impact of a
long and complex power supply line can be fixed by adding a 1μF capacitor to the VBIAS pin as shown
in Figure 2.1 or selecting an optimal capacitor while checking the output waveform from an actual
system board. In order to ensure output voltage regulation, a 1μF or larger capacitor should be
placed even if VBIAS is free from noise. Since the sink current (IBIAS) running into the VBIAS pin is
roughly 20μA at the maximum as shown in Figure 3.4, it is usually unnecessary to be concerned
about a voltage drop caused by an insufficient power supply to the VBIAS pin.
Figure 3.4 IBIAS-VBIAS curves
If the power supply to the VBIAS pin is connected to other loads in parallel, a sudden change in any
of their load currents could cause sudden drop the VBIAS voltage. In order to maintain the VBIAS pin
at a proper voltage even in this situation, a 1μF or greater capacitor should be placed to the VBIAS
pin as shown in Figure 2.1.
VBIAS (V)
I
BIAS
(A)

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3.2. Achieving a high PSRR and the influence of an output capacitor on the PSRR
In order to achieve a low dropout voltage and a high current-drive capability of 1.5A, the TCR15AG
series drives an internal MOSFET with a supply voltage from the VBIAS pin separate from VIN. With a
low dropout voltage performance, the TCR15AG series can regulate a low output voltage at a low
input voltage, so it suits high-current applications such as CMOS image sensors and RF circuit
blocks/modules. Important parameters for these applications include the PSRR that affects the
amount of noise on a power supply to the load circuit and the load transient response, i.e., the
response to sudden changes in the load current that occurs in high-speed digital signal processing
circuits. Figure 3.5 shows the PSRR-frequency characteristics of the TCR15AG series.
Figure 3.5 PSRR-frequency characteristics
The PSRR, also known as a ripple rejection ratio, indicates the capability of an LDO regulator to
suppress variations noise in the input power supply. Expressed in decibels (dB), the greater the PSRR,
the better performance. The PSRR varies with the frequency of noise added on the input power
supply. At frequencies of noise below 1kHz, the TCR15AG series regulates the output voltage through
an internal feedback loop and thus reach a very high PSRR performance about 90dB. The TCR15AG
series also provides a high PSRR from 75 to 80dB at 10kHz. As the frequency increases, the PSRR
decreases. The amount of decrease in the PSRR is determined by the frequency characteristics of
an error amplifier used in the internal feedback loop of an LDO regulator. The TCR15AG series has a
PSRR about 55dB even at 100kHz with the recommended output capacitor (COUT) value of 4.7μF.
This shows that the high-performance error amplifier used in the TCR15AG series is effective in
increasing the PSRR. Figure 3.5 shows PSRR-vs-frequency characteristics for different COUT values.
As COUT increases, the PSRR begins to decline at lower frequencies. On the other hand, a larger COUT
provides a higher PSRR in the high-frequency region due to the positive effect of larger capacitance.
For example, at 100kHz, the TCR15AG series has a PSRR of about 55 dB when COUT=4.7μF whereas
it provides a PSRR of about 65dB, 10dB higher, when COUT=22μF.
VOUT=1.2V
VRipple=200mVp-p
IOUT=10mA
VBAT=5.5V

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This improvement of the PSRR is the effect of a larger output capacitance rather than the ripple
rejection performance of the LDO regulator. In a higher-frequency region, the PSRR declines again.
The points of inflection on the PSRR curve depend on the value of the output capacitor (COUT), the
frequency characteristics of the capacitance, resistance, and inductance of the output capacitor, and
distributed parameters of a board. For noise-sensitive applications that operate at a frequency of
10kHz or higher, it is recommended to test with different types and values of capacitors and select
the good one.
3.3. Achieving a fast high-load transient response
In order to achieve a low dropout voltage and a high current-drive capability of 1.5A, the TCR15AG
series drives an internal MOSFET with a supply voltage from the VBIAS pin separate from VIN. With
a low dropout voltage performance, the TCR15AG series can regulate a low output voltage. LDO
regulators with a low output voltage are commonly used for SoCs, memories, and other high-speed
digital signal processing applications, which is typically up and down rapid change in power
consumption. Obviously, in the face of sudden changes in the load current, LDO regulators must
supply a precisely regulated output voltage to the load. Therefore, a load transient response, which
is defined as a change in the regulated output voltage that occurs as a result of a change in the load
current, is important.
Figure 3.6 Image of a typical load transient response
Figure 3.6 shows an image of a typical load transient response. Generally, as the load current
increases, the output capacitor (COUT) begins to discharge. Then, the LDO regulator starts voltage
control via an internal feedback loop to maintain a regulated output voltage. However, in the event
of a sudden change in the load current, COUT is discharged a moment, causing the output voltage to
decrease. If the voltage control feedback loop is slow to respond, the output voltage continues
decreasing until the feedback loop starts to act its effect to bring the output voltage back to the
regulated level. The load transient response is important since a problem occurs if the output voltage
drops below the minimum operating voltage required by the load. In the event of an excessive
voltage drop, the load suffers a loss in performance or possibly a shutdown. Such an event may lead
Input Voltage
Load Current
Output Voltage
Time
Note: This waveform shows just an image
Load regulation during
transient.

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adversely lacking the operation or performance of the entire system. The fast load transient response
and the ability to provide a low output voltage make the TCR15AG series suits a power supply for
high-speed digital signal processing applications, including SoCs and the digital core (control) of
CMOS image sensors. Figure 3.7 shows examples of load transient response waveforms of the
TCR15AG12 (VOUT=1.2V).
Figure 3.7 Example of load transient response waveforms
The left-side image shows the output voltage waveform in response to a change in the load current
from 10mA to 1.5A. The right-side image shows the waveform in response to a load current change
from 1.5 A to 10 mA. For example, the load current changes rapidly in case of the digital core of a
CMOS image sensor transitions from an idle state to an active mode or in case of a memory device
performs a burst transfer at high speed. The load transient responses of the TCR15AG series shown
in Figure 3.3.2 are the results of measurement under more severe conditions than these cases. As
described in the previous section, a high-performance error amplifier integrated in the TCR15AG
series makes it possible to maintain a regulated output voltage even in the event of sudden change
in the load current. In fact, LDO regulators are seldom exposed to load current changes as rapid as
those shown in Figure 3.7. Therefore, the TCR15AG series provides a sufficient design margin even
for systems sensitive to power supply swing.
C
IN
= 4.7μF
COUT = 4.7μF
CBIAS = 1μF
VIN = 3.3V
VCT = 1.5V
VBIAS = 3.3V
IOUT= 10mA →1.5A →10mA

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4. Output voltage
The TCR15AG series has 46 LDO regulators with different fixed output voltage options from 0.65V
to 3.6V.
The LDO regulator output should be placed close to the load on a Printed Circuit Board (PCB).
Otherwise, the impedance of the PCB wiring causes a voltage drop, making the load’s input voltage
lower than the LDO output voltage. If the LDO output volage is equal to the load’s input voltage
requirement, the load’s input voltage might fall below the operation range because of the voltage
drop. The load, i.e., an IC or a module, has a proper input voltage range to ensure proper operation.
Generally, the IC (or module) performance can be improved by increasing the input voltage so that
it is closer to the upper limit, but power consumption is increased accordingly. Conversely, power
consumption can be reduced by decreasing the input voltage to the IC (or module), but the
performance degradation may happen.
Even if the input voltage to the load (IC or module) is within its specification range, an actual
application may not work properly caused by poor input voltage. In that case, it is necessary to
adjust power supply specifications so that the LDO output voltage becomes slightly higher than the
minimum input voltage of the load.
The TCR15AG series provides fixed-voltage LDO regulators selectable in 0.05V increments at
voltages lower than 1.4V and around the standard power supply voltages such as 1.8V and 3.3V.
Therefore, the TCR15AG series offers you to select an LDO regulator with an output voltage that
best matches your power supply requirement.
In the case of the TCR15AGADJ adjustable-voltage LDO regulator, the output voltage is adjusted
by outside resistor divider. This means that the output voltage accuracy depends on the accuracy of
the internal reference voltage (VADJ) as well as the accuracy of outside resistors. In the case of fixed-
voltage LDO regulators, you need to consider only the output voltage accuracy specified in a
datasheet. The following considers the output voltage accuracy of the TCR15AGADJ (Adjustable-
voltage) and the TCR15AG18 (Fixed-voltage) LDO regulators at a typical output voltage of 1.8V.
Adjustable-output LDO regulator
Figure 4.1 Example of an output circuit for the adjustable-output TCR15AGADJ

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The output voltage (VOUT) is calculated as follow:
where, R1 and R2 are voltage divider resistor values. Suppose that R1=48kΩand R2=24kΩ, which
are the recommended values for a VOUT of 1.8V.
The TCR15AGADJ provides the maximum output voltage when its internal reference voltage (VADJ)
is at the maximum (0.612V), R1 has the maximum value within the register’s specification, and R2
has the minimum value within the register’s specification. If you select commonly used high-
accuracy resistors with 0.5% tolerance, then R1 is 48.24kΩmaximum, and R2 is 23.88kΩminimum.
Substituting these values into the above equation, the maximum VOUT value is calculated to be
1.848V, which is 2.7% higher than the typical VOUT value of 1.8V.
On the other hand, the TCR15AGADJ provides the minimum output voltage when VADJ is at the
minimum (0.588V), R1 has the minimum value (47.76kΩ), and R2 has the maximum value (24.12k
Ω). So the minimum VOUT value is calculated to be 1.752V, which is 2.7% lower than the typical VOUT
value of 1.8V.
Fixed-output LDO regulator
The TCR15AG18 has an output voltage accuracy of ±1%. As described before, the TCR15AGADJ
is ±2.7% even when resistors with 0.5% tolerance are used, while the fixed-output LDO regulator
provides an accuracy of ±1%. As shown by these examples, a fixed-output LDO regulator suits the
designing of a power supply when high-accuracy output voltage regulation is required.
In addition, compared with adjustable-output LDO regulators, fixed-output LDO regulators help
reduce the parts count and the board area since they do not require outside resisters of voltage
divider.
The typical output voltage and its accuracy are specified under the test conditions given in a
datasheet. It should be noted that the output voltage may drop if the output current is higher than
the actual applications.

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5. Design considerations
●External capacitors
A ceramic capacitor can be used as an output capacitor for the TCR15AGADJ. However, the
characteristics of some ceramic capacitors have very large temperature dependence. An output
capacitor should be carefully selected, taking the environmental conditions into account. It is also
recommended to use a ceramic capacitor with an equivalent series resistance (ESR) of 1.0Ω or
less. To ensure stable operation, use an input capacitor of 4.7μF or greater, a bias capacitor of
1.0μF or greater, and an output capacitor of 4.7μF or greater.
●Board assembly
Provide as large a GND plane as possible to reduce wire impedance. Voltage overshoot and
undershoot may happen depending on transient responses of the input and output voltage and
current, a PCB layout, and internal parasitic of an IC.
●Power dissipation
Designing PCB, the IC temperature remains well below the maximum rated temperature during
operation even at the maximum power dissipation point. For PCB design, ambient temperature,
input voltage, and output current, and other environmental conditions should also be considered.
●Overcurrent protection and thermal shutdown
The TCR15AG series has feedback loops for overcurrent protection and thermal shutdown. It
should be noted that these features are not intended to guarantee that the device is kept below
the absolute maximum ratings. Exposure to conditions exceeding the absolute maximum ratings
might adversely affect the functionality and reliability of the device. The device might be
permanently damaged if the output and GND pins of the TCR15AGADJ become partially short-
circuited.
Apply the above design considerations and derate the absolute maximum rated values as
described in the Toshiba Semiconductor Reliability Handbook to ensure that none of the absolute
maximum ratings will be exceeded under any circumstances. It is recommended to add fail-safe
and other safety features to an application system.

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6. Product overview
6.1. TCR15AG (fixed voltage type)
6.1.1. Overview
The TCR15AG series consists of single-fixed-output LDO regulators with a control pin fabricated
using a CMOS process, which feature an ultra-low dropout, fast load transient response, and inrush
current limiting.
The TCR15AG series offers 46 LDO regulators with a fixed voltage of 0.65V to 3.6V and a maximum
output current of 1.5A and provides overcurrent protection, thermal shutdown, inrush current
limiting, undervoltage lockout, and auto output discharge.
The TCR15AG series is housed in the ultra-small WCSP6F package (0.8mm x 1.2mm (typical), t:
0.33mm (maximum)). Since small ceramic capacitors can be used as input and output capacitors,
the TCR15AG series is ideal for applications that require high-density board assembly such as mobile
devices.
Ultra-small package: WCSP6F (0.8mm x 1.2mm typical; t: 0.33mm maximum)
Wide range of output voltage (VOUT= 0.65V to 3.6V)
Fast load transient response: -100 / +115mV (typical) at 0.01A ⇔1.5A, COUT = 4.7μF
High Power Supply Rejection Ratio : PSRR = 95dB (typical) at 1kHz
Overcurrent protection
Thermal shutdown
Auto output discharge function
Inrush current limiting
Output-voltage soft-start
Undervoltage lockout threshold: 0.5V (typical)
6.1.2. External view and pin assignment
1 2
A VOUT VIN
B SENSE CONTROL
C GND VBIAS
Figure 6.1 External view, marking, and pin assignment
Bottom View
External view and marking
Pin assignment

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Table 6.1 TCR15AG (fixed voltage type) lineup
Part Number VOUT (V) (typ.) Marking Part Number VOUT (V) (typ.) Marking
TCR15AG065 0.65
0KA
TCR15AG20 2.0
2K0
TCR15AG07 0.7
0K7
TCR15AG21 2.1
2K1
TCR15AG075 0.75
0KB
TCR15AG22 2.2
2K2
TCR15AG08 0.8
0K8
TCR15AG23 2.3
2K3
TCR15AG085 0.85 0KC TCR15AG24 2.4 2K4
TCR15AG09 0.9
0K9
TCR15AG25 2.5
2K5
TCR15AG095 0.95 0KF TCR15AG26 2.6 2K6
TCR15AG10 1.0
1K0
TCR15AG27 2.7
2K7
TCR15AG105 1.05
0KH
TCR15AG275 2.75
0KP
TCR15AG11 1.1
1K1
TCR15AG28 2.8
2K8
TCR15AG115 1.15 0KJ TCR15AG285 2.85 0KR
TCR15AG12 1.2
1K2
TCR15AG29 2.9
2K9
TCR15AG125 1.25 0KK TCR15AG295 2.95 0KT
TCR15AG13 1.3
1K3
TCR15AG30 3.0
3K0
TCR15AG135 1.35
0KL
TCR15AG305 3.05
0KU
TCR15AG14 1.4
1K4
TCR15AG31 3.1
3K1
TCR15AG15 1.5 1K5 TCR15AG32 3.2 3K2
TCR15AG16 1.6
1K6
TCR15AG325 3.25
0KW
TCR15AG17 1.7 1K7 TCR15AG33 3.3 3K3
TCR15AG175 1.75
0KM
TCR15AG335 3.35
0KX
TCR15AG18 1.8
1K8
TCR15AG34 3.4
3K4
TCR15AG185 1.85
0KN
TCR15AG35 3.5
3K5
TCR15AG19 1.9
1K9
TCR15AG36 3.6
3K6

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6.1.3. Internal block diagram
Figure 6.2 Internal block diagram
6.1.4. Pin description
Table 6.2 Pins of the TCR15AG (fixed voltage type)
Pin
Name
Description
A1
VOUT
Output. For stable operation, add an output capacitor of 4.7μF or greater.
B1 SENSE
SENSE pin. Connect the SENSE pin to the V
OUT
pin with the shortest
possible wire to avoid the effect of noise.
A2 VIN
Power supply input. For stable operation, add an input capacitor of 4.7μF
or greater
B2 CONTROL
Output on/off control pin. A High on this input turns on the output. A Low
on this input turns off the output. The CONTROL pin is internally
connected to GND via a pulldown resistor.
C1
GND
Ground
C2 VBIAS
Bias power supply pin. For stable operation, add a bias capacitor of 1.0μF
or greater (with an ESR of 1.0Ω or less).
V
IN V
OUT
GND
CONTROL
V
BIAS
-
+
Thermal
shutdown
Current
Limit
Pull down
Under
voltage
lockout
Control
Logic
SENSE

RD030-RGUIDE-02
2019-05-08
Rev.2
18 / 18
© 2019
Toshiba Electronic Devices & Storage Corporation
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