MST5450BTG

MST54XXB 45V/300mA/2.1uA IQ/Fast Transient Low-Dropout Linear Voltage Regulator Milestone Semiconductor Inc.  Description  Features The MST54XXB series is a high input voltage  Low Quiescent Current：2.1uA (45V), low quiescent current (2.1uA), low-dropout  High Input Voltage Rating：Up to 55V linear regulator (LDO) able to provide 300mA load  High Output Current：350mA current. The MST54XXB family LDO offers EN  High PSRR：85dB at 1kHZ pin to enable and disable the LDO output, EN pin can take 45V input voltage. The LDO features very fast response against line voltage transient and load current transient, and ensures no overshoot voltage during the LDO start up and short circuit recovery. The device features integrated short-circuit and thermal shutdown protection. The device is available with fixed output voltages of 1.8V, 3.0V, 3.3V and 5.0V, and available in SOT23 and SOT89 packages.  Application  Battery-powered equipment  Smoke detector and sensor  Micro controller Applications  Home Appliance  Low Dropout Voltage： 35mV@10mA 350mV@100mA  Fixed Output Voltages： 1.8V, 3.0V, 3.3V and 5.0V  High-accuracy Output Voltage: ±2%  Fast Transient Response  Integrated Short-Circuit Protection  Enable pin is available  Integrated Thermal Protection  Available Packages： MST54XXBTE MST54XXBTE-A MST54XXBTE-B MST54XXBTE-C MST54XXBTS MST54XXBTS-A MST54XXBTS-B MST54XXBTS-C MST54XXBTG SOT23-3 SOT89-3 SOT23-5  Application Circuits MST www.mst-ic.com -1- MST54XXB 45V/300mA/2.1uA IQ/Fast Transient Low-Dropout Linear Voltage Regulator Milestone Semiconductor Inc.  Packages And Pin Assignment  Pin Descriptions SOT23-3 MST54XXBTE MST54XXBTE-A 1 2 3 MST54XXBTE-B MST54XXBTE-C Pin Name 3 2 1 3 1 2 GND VOUT VIN Ground Pin Output Pin Input Pin Description 2 1 3 SOT89-3 Description MST54XXBTS MST54XXBTS-A MST54XXBTS-B MST54XXBTS-C Pin Name 1 3 2 3 1 2 2 3 1 2 1 3 GND VOUT VIN Ground Pin Output Pin Input Pin Pin Name Description VIN GND EN NC VOUT Input Pin Ground Pin Enable pin No Connection Output Pin SOT23-5 MST54XXBTG 1 2 3 4 5 MST www.mst-ic.com -2- MST54XXB Milestone Semiconductor Inc. 45V/300mA/2.1uA IQ/Fast Transient Low-Dropout Linear Voltage Regulator  Functional Block Diagram  Absolute Maximum Ratings Item Voltage Current Temperature Thermal Resistance (Junction to Ambient) Power Dissipation Electrostatic discharge rating MST Description Min Max Unit VIN to GND -0.3 55 V VOUT to GND -0.3 6 V VOUT to VIN -55 0.3 V EN to GND -0.3 55 V Peak output current Internally limited Operating Ambient Temperature -40 85 ℃ Storage Temperature Operating virtual junction Temperature SOT89 -40 150 ℃ - 150 ℃ 180 ℃/W SOT23 360 ℃/W SOT89 600 mW SOT23 300 mW Human Body Model（HBM） 4 kV Charged Device Model（MM） 100 V www.mst-ic.com -3- MST54XXB 45V/300mA/2.1uA IQ/Fast Transient Low-Dropout Linear Voltage Regulator Milestone Semiconductor Inc.  Electrical Characteristics （At TA=25°C, CIN=1uF, VIN=VOUTNOM+1.0V, COUT=10uF, unless otherwise noted） Symbol Parameter VIN Input Voltage IGND Quiescent Current VIN=12V, No load VOUT Output Voltage VIN=12V, IOUT=10mA IOUT_MAX Output Current VDROP Dropout Voltage(1) ΔVOUT(ΔIOUT) Load Regulation ΔVOUT(ΔVIN) Line Regulation ILIMIT Current Limit TSHDN Thermal Shutdown Temperature Test Conditions IOUT=10mA , VIN=VOUTNOM-0.1V IOUT=100mA , VIN=VOUTNOM-0.1V VIN=12V, 1mA≤IOUT≤100mA IOUT=1mA, VOUTNOM+0.5V≤VIN≤40 V VENH EN High level Shutdown, temperature increasing Reset, temperature decreasing Vin=12V , Iout=10mA F=1Khz,Vout=3.3V Enabled VENL EN Low level Shutdown PSRR Min Typ Max Unit 3 — 45 V — 2.1 — uA VOUTNOM VOUTNOM * 1.02 V 300 350 — mA — 35 — mV — 350 — mV — 0.02 — %/mA — 0.01 — %/V — 500 — mA — 150 — — 140 — VOUTNOM * 0.98 ℃ 85 dB 1 — — V — — 0.4 V Note：(1) Dropout Voltage is the voltage difference between the input and the output at which the output voltage drops 2% below its nominal value. MST www.mst-ic.com -4- MST54XXB Milestone Semiconductor Inc. 45V/300mA/2.1uA IQ/Fast Transient Low-Dropout Linear Voltage Regulator  Typical Performance Characteristics Test Condition: TA=25°C,Vin=12V,Iout=1mA,COUT=10uF, unless otherwise note Input Voltage（V） MST www.mst-ic.com -5- MST54XXB 45V/300mA/2.1uA IQ/Fast Transient Low-Dropout Linear Voltage Regulator Milestone Semiconductor Inc. Line Transient Response Line Transient Response Time(4us/div) Time(4us/div) Load Transient Response Load Transient Response 120mV -280mV Time(20us/div) Time(200us/div) Start Up Start Up Time(100us/div) Time(100us/div) Short Circuit Protection Short Circuit Protection Time(20ms/div) MST Time(2ms/div) www.mst-ic.com -6- MST54XXB Milestone Semiconductor Inc. 45V/300mA/2.1uA IQ/Fast Transient Low-Dropout Linear Voltage Regulator  Functional Description  Input Capacitor A 1μF ceramic capacitor is recommended to connect between VIN and GND pins to decouple input power supply glitch and noise. The amount of the capacitance may be increased without limit. This input capacitor must be located as close as possible to the device to assure input stability and less noise. For PCB layout, a wide copper trace is required for both VIN and GND.  Output Capacitor An output capacitor is required for the stability of the LDO. The recommended minimum output capacitance is 1μF, ceramic capacitor is recommended, and temperature characteristics are X7R or X5R. Higher capacitance values help to improve load/line transient response. The output capacitance may be increased to keep low undershoot/overshoot. Place output capacitor as close as possible to VOUT and GND pins.  EN Pin Operation The MST54XXB is turned on by setting the EN pin to “H”. Since the EN pin is neither pulled down nor pulled up internally, do not set it in floating status. When the EN pin is not used, connect the EN pin with VIN to keep the LDO in operating mode.  Current Limit and Short Circuit Protection When output current at VOUT pin is higher than current limit threshold or the VOUT pin is direct short to GND, the current limit protection will be triggered and clamp the output current at a pre-designed level to prevent over-current and thermal damage.  Thermal Protection The MST54XXB has internal thermal sense and protection circuits. When excessive power dissipation happens on the device, such as short circuit at the output pin or very heavy load current with a large voltage drop across the device, the internal thermal protection circuit will be triggered, and it will shut down the power MOSFET to prevent the LDO from damage. As soon as excessive thermal condition is removed and the temperature of the device drops down, the thermal protection circuit will lease the control of the power MOSFET, and the LDO device goes to normal operation. MST www.mst-ic.com -7- MST54XXB Milestone Semiconductor Inc. 45V/300mA/2.1uA IQ/Fast Transient Low-Dropout Linear Voltage Regulator  Ordering And Marking Information  Package Outline Dimensions SOT23-3 MST www.mst-ic.com -8- MST54XXB Milestone Semiconductor Inc. 45V/300mA/2.1uA IQ/Fast Transient Low-Dropout Linear Voltage Regulator SOT89-3 SOT23-5 MST www.mst-ic.com -9- MST54XXB 45V/300mA/2.1uA IQ/Fast Transient Low-Dropout Linear Voltage Regulator Milestone Semiconductor Inc.  Packing Information W P D Type W(mm) P(mm) D(mm) Qty (pcs) SOT23-3 8.0±0.1 mm 4.0±0.1 mm 180±1 mm 3000pcs SOT23-5 8.0±0.1 mm 4.0±0.1 mm 180±1 mm 3000pcs SOT89-3 12.0±0.1 mm 4.0±0.1 mm 180±1 mm 1000pcs MST www.mst-ic.com - 10 - MST54XXB Milestone Semiconductor Inc. 45V/300mA/2.1uA IQ/Fast Transient Low-Dropout Linear Voltage Regulator IMPORTANT NOTICE MST INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION). MST Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to this document and any product described herein. MST Incorporated does not assume any liability arising out of the application or use of this document or any product described herein; neither does MST Incorporated convey any license under its patent or trademark rights, nor the rights of others. Any Customer or user of this document or products described herein in such applications shall assume all risks of such use and will agree to hold MST Incorporated and all the companies whose products are represented on MST Incorporated website, harmless against all damages. MST Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales channel. Should Customers purchase or use MST Incorporated products for any unintended or unauthorized application, Customers shall indemnify and hold MST Incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized application. Products described herein may be covered by one or more United States, international or foreign patents pending. Product names and markings noted herein may also be covered by one or more United States, international or foreign trademarks. MST www.mst-ic.com - 11 -