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RD030-RGUIDE-02

2019-05-08

Rev.2

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18

© 2019

Toshiba Electronic Devices & Storage Corporation

LDO Regulator TCR15AG

(fixed output voltage type)

Application & Circuit

Reference Guide

RD030-RGUIDE-02

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Содержание TCR15AG Series

Страница 1: ...RD030 RGUIDE 02 2019 05 08 Rev 2 1 18 2019 Toshiba Electronic Devices Storage Corporation LDO Regulator TCR15AG fixed output voltage type Application Circuit Reference Guide RD030 RGUIDE 02 ...

Страница 2: ... 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 ...

Страница 3: ... 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...

Страница 4: ... 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 fo...

Страница 5: ... 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 3 C2 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 condi...

Страница 6: ...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...

Страница 7: ...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 ...

Страница 8: ...in 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...

Страница 9: ...er 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 ...

Страница 10: ...d 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 Fig...

Страница 11: ... 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 thes...

Страница 12: ... 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 standa...

Страница 13: ...es 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 toleranc...

Страница 14: ...ssipation 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 therm...

Страница 15: ...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 115m...

Страница 16: ...95 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 ...

Страница 17: ...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 ope...

Страница 18: ...s which minimize risk and avoid situations in which a malfunction or failure of semiconductor devices could cause loss of human life bodily injury or damage to property including data loss or corruption Customers must also refer to and comply with the latest versions of all relevant our information including without limitation specifications data sheets and application notes for semiconductor devi...

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