SA21345AFCA

Application Note: SA21345A 36V, 300mA LDO Regulator General Description Features  The SA21345A is an efficient, precise LDO designed for high input voltage and ultra low quiescent current applications.  The SA21345A provides adjustable output voltage and very low drop out (300mV at 300mA). Other features include the operation stability with low ESR ceramic or tantalum capacitors due to the optimized internal compensation, over current protection and thermal shutdown.  Wide Input Voltage Range: 4V to 36V Low Dropout Voltage (300mV @ 300mA) Ultra-low Quiescent Current Extremely Low Shutdown Current Stability with Tantalum or Ceramic Capacitors Excellent Load and Line Regulation 300mA Maximum Load Current Enable Control Input Over Current Protection Thermal Shutdown Compact SO8E Package Automotive AEC- Q100 Grade 1 Certified    公 司     限 The SA21345A is available in SO8E package.  有  电 子 Ordering Information Package type SO8E Note Applications      Battery powered Applications Automotive Applications Gateway Applications Remote Keyless Entry Systems SMPS post-regulator/ DC-DC modules l-F or 南 Ordering Number SA21345AFCA 京 商 Temperature Code Package Code Optional Spec Code 络 SA21345 □(□□)□ IN VOUT OUT COUT Enable Signal EN GND Sil erg yC on CIN Dropout Characteristics 6 R1 ADJ 5 Output Voltage (V) VIN fid en tia Typical Applications 4 3 2 IO=1mA IO=150mA IO=300mA 1 R2 0 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.0 Input Voltage (V) Figure1. Schematic Diagram AN_SA21345A Rev. 0.9 © 2020 Silergy Corp. Figure2. Dropout Characteristics Silergy Corp. Confidential- Prepared for Customer Use Only 1 All Rights Reserved. SA21345A Pinout (top view) NC 1 OUT 2 ADJ 3 GND 4 Exposed Pad 8 NC 7 IN 6 EN 5 NC SO8E Top mark: CSZxyz for (Device code: CSZ, x=year code, y=week code, z= lot number code) 4 EN 6 IN 7 限 GND 有 3 电 子 ADJ l-F or 南 Exposed Pad Block Diagram Pin Description Not connected Output pin. Bypass this pin to Ground pin with a 2.2μF output capacitor. Output voltage adjust pin. Feedback the output voltage through resistor voltage divider network. VOUT=0.6×(1+R1/R2) Ground pin. Enable pin. Pull it low to shutdown or pull it high to enable, do not leave floating. IC power supply input. Bypass this pin to Ground pin with a 10μF capacitor. The exposed pad should be connected to ground plane for better thermal performance. 络 Pin Number 1, 5, 8 2 京 商 Pin Name NC OUT 公 司 Pin Description OUT Current Sence UVLO LDO Sil erg yC on fid en tia IN Control EN Thermal Detect GND Discharge + ADJ SST - 0.6V Ref Figure3. Block Diagram AN_SA21345A Rev. 0.9 © 2020 Silergy Corp. Silergy Corp. Confidential- Prepared for Customer Use Only 2 All Rights Reserved. SA21345A Absolute Maximum Ratings (Note 1) IN to GND ------------------------------------------------------------------------------------------------------------ -0.3V to 40V OUT, EN, ADJ to GND ------------------------------------------------------------------------------------- -0.3V to 0.3V+VIN Power Dissipation, PD @ TA = 25°C SO8E ------------------------------------------------------------------------------ 3.3W Package Thermal Resistance (Note 2) θJA ----------------------------------------------------------------------------------------------------------------------- 30°C/W θJC ----------------------------------------------------------------------------------------------------------------------- 20°C/W Storage Temperature ------------------------------------------------------------------------------------------- -65°C to +150°C Junction Temperature (TJ) (Note 5) ------------------------------------------------------------------------- -40°C to +150°C Lead Temperature (Soldering, 10sec.) ---------------------------------------------------------------------------------- +260°C 公 司 Recommended Operating Conditions (Note 3) Sil erg yC on fid en tia l-F or 南 京 商 络 电 子 有 限 Supply Input Voltage -------------------------------------------------------------------------------------------------- 4V to 36V Ambient Temperature Range ---------------------------------------------------------------------------------- -40°C to 125°C AN_SA21345A Rev. 0.9 © 2020 Silergy Corp. Silergy Corp. Confidential- Prepared for Customer Use Only 3 All Rights Reserved. SA21345A Electrical Characteristics (VIN =12V, VOUT=3.3V, VEN=VIN, TA = -40°C~125°C unless otherwise specified, the values are guaranteed by test design or statistical correlation) Parameter Symbol Test Conditions Min Typical Max Unit Input Voltage VIN IOUT=10mA Reference Voltage VREF Line Regulation ΔVLNR Load Regulation ΔVLDR Dropout Voltage VIN-VOUT Quiescent Current 4 582 36 V 600 618 mV 1 1.5 mV/V 0.25 1 % IQ IO=10mA IO=150mA IO=300mA No Load 10 150 300 7 20 300 550 14 mV mV mV µA Shutdown Current ISHDN VEN=0V, VIN=24V Output Current IO VIN=VOUT+0.6V Output Current limit ILIM VIN=6V,VOUT=0.9VOUT(normal) Power-supply Ratio PSRR 限 有 电 子 VUVLO UVLO Hysteresis Shutdown Discharge Resistance Enable Input Logic-High Voltage Enable Input Logic-Low Voltage Thermal Shutdown Temperature(Note 4) Thermal Shutdown hysteresis (Note 4) VUVLO_HYS 300 900 mA dB f=150kHz, COUT=10μF 30 dB 2.9 V IN =5V 3.4 4 V 0.1 V 600 Ω 1.5 V V IN =5V 0.4 V TSD 150 °C THYS 20 °C fid en tia l-F or VEN_H VEN_L mA 60 V IN rising 南 RDIS µA 300 京 商 Input UVLO Threshold 5 0 f=1kHz, COUT=10μF 络 Rejection 公 司 VIN=(VOUT+0.3V) to 36V, IO=10mA IO=10mA to 300mA yC on Note 1: Stresses beyond the “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only. Functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Sil erg Note 2: θJA is measured in the natural convection at T A = 25°C on a low effective two-layer thermal conductivity test board of JEDEC 51-3 thermal measurement standard. Note 3: The device is not guaranteed to function outside its operating conditions. Note 4: Guaranteed by design. Note 5: Operating lifetime is derated for junction temperatures greater than 125°C. AN_SA21345A Rev. 0.9 © 2020 Silergy Corp. Silergy Corp. Confidential- Prepared for Customer Use Only 4 All Rights Reserved. SA21345A Typical Performance Characteristics Supply Current vs. Input Voltage Dropout Voltage vs. Load Current (CIN=10µF, COUT=2.2µF) (VIN=12V, ADJ=0.5V, CIN=10µF, COUT=2.2µF) 10 300 9 250 Dropout Voltage (mV) 7 6 5 4 2 150 100 50 1 5 15 10 20 25 30 35 40 Output Voltage vs. Input Voltage (VOUT=3.3V, CIN=10µF, COUT=2.2µF, IOUT=10mA) 京 商 3.5 3.4 南 l-F or tia 3.1 3.0 8 12 16 20 24 100 150 200 250 300 OUT Voltage vs. Load Current 3.6 3.5 3.4 3.3 3.2 3.1 3.0 28 32 36 40 en 4 50 (VIN=12V, VOUT=3.3V, CIN=10µF, COUT=2.2µF ) 络 3.6 3.2 0 Load Current (mA) 电 子 Input Voltage (V) 3.3 0 有 0 限 0 Output Voltage (V) 200 公 司 3 OUT Voltage (V) Supply Current (µA) 8 50 100 150 200 250 300 Load Current (mA) on fid Input Voltage (V) 0 Shutdown from Enable (VIN=12V, VOUT=3.3V, CIN=10µF, COUT=2.2µF, IOUT=300mA) Sil erg yC Startup from Enable (VIN=12V, VOUT=3.3V, CIN=10µF, COUT=2.2µF, IOUT=300mA) VEN 2V/div VEN 2V/div VIN 5V/div VIN 5V/div VOUT 2V/div VOUT 2V/div IO 0.2A/div IO Time (400μs/div) AN_SA21345A Rev. 0.9 © 2020 Silergy Corp. 0.2A/div Time (400μs/div) Silergy Corp. Confidential- Prepared for Customer Use Only 5 All Rights Reserved. SA21345A Startup from VIN Shutdown from VIN (VIN=12V, VOUT=3.3V, CIN=10µF, COUT=2.2µF, IOUT=300mA) (VIN=12V, VOUT=3.3V, CIN=10µF, COUT=2.2µF, IOUT=300mA) VIN 5V/div VOUT 1V/div VOUT 1V/div IO 有 Line Transient 电 子 Load Transient (VIN=12V, VOUT=3.3V, CIN=10µF, COUT=2.2µF, IOUT=10mA～300mA～10mA) (VIN=8V~18V~8V, VOUT=5V, CIN=10µF, COUT=2.2µF, IOUT=300mA) VIN 5V/div 200mV/div IO 200mA/div VOUT 100mV/div IO 200mA/div tia l-F or 南 VOUT 京 商 络 5V/div 0.5A/div Time (10ms/div) 限 Time (800μs/div) VIN 5V/div 0.5A/div 公 司 IO VIN Time (400μs/div) fid en Time (200μs/div) on PSRR (VIN=12V, VOUT=3.3V, CIN=Null, COUT=2.2µF, IOUT=300mA) 80 yC 80 PSRR (VIN=12V, VOUT=3.3V, CIN=Null, COUT=2.2µF, IOUT=10mA) 70 60 60 50 Gain(dB) Gain(dB) Sil erg 70 40 30 50 40 30 20 20 10 10 0 100 1k 10k Frequency(Hz) AN_SA21345A Rev. 0.9 © 2020 Silergy Corp. 100k 1M 0 100 1k 10k 100k 1M Frequency(Hz) Silergy Corp. Confidential- Prepared for Customer Use Only 6 All Rights Reserved. SA21345A Short Protect (VIN=36V, VOUT=3.3V, CIN=10µF, COUT=2.2µF, IOUT=Null～Short Circuit～Null) 10V/div VOUT 1V/div IOUT 5A/div 公 司 VIN Sil erg yC on fid en tia l-F or 南 京 商 络 电 子 有 限 Time (2ms/div) AN_SA21345A Rev. 0.9 © 2020 Silergy Corp. Silergy Corp. Confidential- Prepared for Customer Use Only 7 All Rights Reserved. SA21345A Over Current and Short Circuit Protection: The device includes over current and short circuit protection. The current limitation circuit regulates the output current to its limitation threshold to protect IC from damage. Under over current or short circuit condition, the power loss of the IC is relative high. And that may trigger the thermal protection. Operation The SA21345A is a 300mA linear regulator with a low drop out voltage. Like any low-dropout regulator, the SA21345A requires input and output decoupling capacitors. The SA21345A has an adjustable output which can be set by two external resistors. The device with fully protection includes over current limit, output short protection and over temperature operation. 络 限 有 电 子 Feedback Resistor Dividers R1 and R2: Choose R1 and R2 to program the proper output voltage. To minimize the power consumption under light loads, it is desirable to choose large resistance values for both R1 and R2. A value of between 10kΩ and 10MΩ is highly recommended for both resistors. If VOUT is 3.3V, R1=1.6MΩ is chosen, then using following equation, R2 can be calculated to be 357kΩ: 0.6V R2 = R1 . VOUT -0.6V 公 司 Applications Information 京 商 VOUT R1 南 0.6VFB R2 l-F or GND The final operating junction temperature for any set of condition can be estimated by the following thermal equation: PD(MAX)=(TJ(MAX)－TA)/θJA Where TJ(MAX is the maximum junction temperature of die and T is the maximum ambient temperature. The junction to ambient thermal resistance (θ ) footprint is 30°C/W for SO8E package. ) A JA Load Transient Considerations: The SA21345A integrates the compensation components to achieve good stability and fast transient responses. In some applications, adding a small ceramic cap in parallel with R1 may further speed up the load transient responses and is thus recommended for applications with large load transient step requirements. on fid en tia Input Capacitor CIN: An input capacitor about 10μF is required between the device input pin and ground pin. A typical X5R or better grade ceramic capacitor is recommended in this application. This input capacitor must be located close to the device to minimize the input noise. Thermal Considerations: The SA21345A can deliver a current of up to 300mA over the full operating temperature range. However, the maximum output current must be derated at higher ambient temperature. With all possible conditions, the junction temperature must be within the range specified under operating conditions. Power dissipation can be calculated based on the output current and the voltage drop across regulator. PD=(VIN－VOUT)×IOUT+VIN×IGND Sil erg yC Output Capacitor COUT: For transient stability, the SA21345A is designed specifically to work with very small ceramic output capacitors. 2.2μF output capacitance can be used in this application. Higher capacitance values help to improve transient. The output capacitor’s ESR is critical because it forms a zero to provide phase lead which is required for loop stability. C1 (opt.) R1 COUT R2 Dropout Voltage: The SA21345A has a very low dropout voltage due to its extra low RDS(ON) of the main PMOS determines the lowest usable supply. VDROPOUT=VIN－VOUT=RDS(ON)×IOUT AN_SA21345A Rev. 0.9 © 2020 Silergy Corp. Silergy Corp. Confidential- Prepared for Customer Use Only 8 All Rights Reserved. SA21345A capability of current flow. PCB Layout Guide: For best performance of the SA21345A, the following guidelines must be strictly followed: 2. Place input/output capacitor close to the IC for better transient performance. 公 司 1. Keep all power trace as short and wide as possible. And it is desirable to use 2-layer or 4layer board for thermal performance and better C2 VIN 1 电 子 NC 有 限 OUT NC 8 OUT C1 IN 2 Exposed 7 络 ADJ EN Pad 3 6 NC 京 商 GND 4 5 南 C 4 R1 R 2 GND l-F or tia GND Top layer Bottom layer Figure4. PCB Layout Suggestion Sil erg yC on fid en Via EN AN_SA21345A Rev. 0.9 © 2020 Silergy Corp. Silergy Corp. Confidential- Prepared for Customer Use Only 9 All Rights Reserved. SA21345A 电 子 有 限 公 司 SO8E Package Outline & PCB layout Side view Sil erg yC on fid en tia l-F or 南 京 商 络 Top view Notes: Front view Recommended PCB layout (Reference Only) All dimension in millimeter and exclude mold flash & metal burr. AN_SA21345A Rev. 0.9 © 2020 Silergy Corp. Silergy Corp. Confidential- Prepared for Customer Use Only 10 All Rights Reserved. SA21345A Taping & Reel Specification 1. Taping orientation SO8E 3.9/4.1 Feeding direction 电 子 有 限 公 司 11.7/12.3 1.45/1.55 yC on fid en tia l-F or 南 京 商 络 2. Carrier Tape & Reel specification for packages Sil erg Package type SO8E Tape width (mm) Pocket pitch(mm) Reel size (Inch) Trailer length(mm) Leader length (mm) Qty per reel 12 8 13" 400 400 2500 3. Others: NA AN_SA21345A Rev. 0.9 © 2020 Silergy Corp. Silergy Corp. Confidential- Prepared for Customer Use Only 11 All Rights Reserved. SA21345A Revision History Sil erg yC on fid en tia l-F or 南 京 商 络 电 子 有 限 公 司 The revision history provided is for informational purpose only and is believed to be accurate, however, not warranted. Please make sure that you have the latest revision. Date Revision Change Nov.30, 2020 Revision 0.9 Initial Release AN_SA21345A Rev. 0.9 © 2020 Silergy Corp. Silergy Corp. Confidential- Prepared for Customer Use Only 12 All Rights Reserved. SA21345A IMPORTANT NOTICE 1. Right to make changes. Silergy and its subsidiaries (hereafter Silergy) reserve the right to change any information published in this document, including but not limited to circuitry, specification and/or product design, manufacturing or descriptions, at any time and without notice. This document supersedes and replaces all information supplied prior to the publication hereof. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All semiconductor products are sold subject to Silergy’s standard terms and conditions of sale. 电 子 有 限 公 司 2. Applications. Application examples that are described herein for any of these products are for illustrative purposes only. Silergy makes no representation or warranty that such applications will be suitable for the specified use without further testing or modification. Buyers are responsible for the design and operation of their applications and products using Silergy products. Silergy or its subsidiaries assume no liability for any application assistance or designs of customer products. It is customer’s sole responsibility to determine whether the Silergy product is suitable and fit for the customer’s applications and products planned. To minimize the risks associated with customer’s products and applications, customer should provide adequate design and operating safeguards. Customer represents and agrees that it has all the necessary expertise to create and implement safeguards which anticipate dangerous consequences of failures, monitor failures and their consequences, lessen the likelihood of failures that might cause harm and take appropriate remedial actions. Silergy assumes no liability related to any default, damage, costs or problem in the customer’s applications or products, or the application or use by customer’s third-party buyers. 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Silergy products are sold subject to the standard terms and conditions of commercial sale, as published at http://www.silergy.com/stdterms, unless otherwise agreed in a valid written individual agreement specifically agreed to in writing by an authorized officer of Silergy. In case an individual agreement is concluded only the terms and conditions of the respective agreement shall apply. Silergy hereby expressly objects to and denies the application of any customer’s general terms and conditions with regard to the purchase of Silergy products by the customer. Sil erg 6. No offer to sell or license. Nothing in this document may be interpreted or construed as an offer to sell products that is open for acceptance or the grant, conveyance or implication of any license under any copyrights, patents or other industrial or intellectual property rights. Silergy makes no representation or warranty that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other intellectual property right. Information published by Silergy regarding third-party products or services does not constitute a license to use such products or services or a warranty or endorsement thereof. Use of such information may require a license from a third party under the patents or other intellectual property of the third party, or a license from Silergy under the patents or other intellectual property of Silergy. For more information, please visit: www.silergy.com ©2020 Silergy Corp. AN_SA21345A Rev. 0.9 © 2020 Silergy Corp. Powered by TCPDF (www.tcpdf.org) All Rights Reserved. Silergy Corp. Confidential- Prepared for Customer Use Only 13 All Rights Reserved.