IFX4949 5V Low Drop Out Linear Voltage Regulator IFX4949SJ Data Sheet Rev. 1.
IFX4949 Table of Contents Table of Contents 1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 3.1 3.2 Pin Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5V Low Drop Out Linear Voltage Regulator 1 IFX4949 Overview Features • • • • • • • • • • • Operating DC Supply Voltage Range 5 V to 28 V Transient Supply Voltage up to 40 V Extremely low Quiescent Current in Standby Mode High Precision Standby Output Voltage 5 V ±1% Output Current Capability up to 100 mA Very low Dropout Voltage less than 0.
IFX4949 Block Diagram 2 Block Diagram Block_Diagram.vsd Preregulator 5V PRE IN OUT RO Reset Bandgap Reference SO SI GND Figure 1 Data Sheet D Block Diagram 4 Rev. 1.
IFX4949 Pin Configuration 3 Pin Configuration 3.1 Pin Assignment PG-DSO-8 IN 1 8 OUT SI 2 7 SO PRE 3 6 RO D 4 5 GND PG-DSO-8.vsd Figure 2 Pin Configuration PG-DSO-8 3.2 Pin Definitions and Functions PG-DSO-8 Pin Symbol Function 1 IN Input; block to GND directly at the IC with a ceramic capacitor. 2 SI Sense Input; if not needed connect to OUT 3 PRE Preregulator Output; 4 D Reset Delay; to select delay time, connect to GND via capacitor.
IFX4949 General Product Characteristics 4 General Product Characteristics 4.1 Absolute Maximum Ratings Absolute Maximum Ratings 1) Tj = -40 °C to +125 °C; all voltages with respect to ground, direction of current as shown in Figure 3 “Application Diagram” on Page 14 (unless otherwise specified) Pos. Parameter Symbol Limit Values Unit Conditions Min. Max. VIN VIN_TR VPRE VOUT VRO VSI VSO VD -0.3 28 V – – 45 V 2) – 7 V – -0.3 20 V – -0.3 20 V – -30 40 V – -0.
IFX4949 General Product Characteristics 4.2 Functional Range Table 1 Pos. Parameter Symbol Limit Values Unit Conditions Min. Max. 4.2.1 Input Voltage Range for Normal Operation VIN 5.5 28 V – 4.2.2 Extended Input Voltage Range VIN 3.5 40 V –1) 2) 1) The output voltage will follow the input voltage for input voltages below VOUT + VDR, i.e device is in tracking mode until VOUT + VDR is reached.
IFX4949 4.4 Electrical Characteristics 4.4.1 Voltage Regulator Electrical Characteristics: Regulator VIN = 14 V, Tj = -40 °C to +125 °C, all voltages with respect to ground, direction of current as shown in Figure 3 “Application Diagram” on Page 14 (unless otherwise specified) Pos. Parameter Symbol Limit Values Unit Conditions TJ = 25°C; IOUT = 1mA 6V ≤ VIN ≤ 28V; 1mA ≤ IOUT ≤ 50mA VIN = 40V1); 5mA ≤ IOUT ≤ 100mA 6V ≤ VIN ≤ 28V; 0mA ≤ IOUT ≤ 100mA IOUT = 10mA IOUT = 50mA IOUT = 100mA VIN = 3.
IFX4949 4.4.2 RESET Electrical Characteristics: Reset VIN = 14 V, Tj = -40 °C to +125 °C, all voltages with respect to ground, direction of current as shown in Figure 3 “Application Diagram” on Page 14 (unless otherwise specified) Pos. Parameter Symbol Limit Values Unit Conditions Min. Typ. Max. 4.4.13 Reset Threshold Voltage 4.25 4.5 4.4.14 Reset Threshold Hysteresis 50 4.4.15 Reset Pulse Delay VRT VRTH tRD 4.
IFX4949 4.4.4 Preregulator Electrical Characteristics: Preregulator VIN = 14 V, Tj = -40 °C to +125 °C, all voltages with respect to ground, direction of current as shown in Figure 3 “Application Diagram” on Page 14 (unless otherwise specified) Pos. Parameter Symbol Limit Values Unit Conditions Min. Typ. Max. 4.5 5 6 V IPRE = 10 µA – – 10 µA – Preregulator 4.4.27 Preregulator Output Voltage 4.4.28 Preregulator Output Current Data Sheet VPRE IPRE 10 Rev. 1.
IFX4949 4.5 Typical Performance Graphs Typical Performance Characteristics Equivalent Series Resistance ESR(COUT) versus Output Current IOUT Output Voltage VOUT versus Junction Temperature TJ 100 5,20 COUT = 4.7µF TJ = 25°C VIN = 6..
IFX4949 Dropout Voltage VDR versus Junction Temperature TJ Quiescent Current IQ versus Output Current IOUT 3 0,4 VIN = 14V TJ = 25°C IOUT = 100mA 2,5 0,3 2 IQ [mA] VDR [V] IOUT = 50mA 0,2 1,5 IOUT = 10mA 1 0,1 0,5 0 -40 0 40 80 0 120 0,1 1 10 TJ [°C] 100 IOUT [mA] Quiescent Current IQSE versus Junction Temperature TJ Quiescent Current IQ versus Input Voltage VIN 3 300 TJ = 25°C VIN = 14V IOUT= 0.
IFX4949 Reset Thresholds VRT versus Junction Temperature TJ 6 4,8 5 4,7 4 4,6 VRT [V] VRO [V] Reset Output Voltage VRO versus Regulator Output Voltage VOUT 3 4,5 2 4,4 1 4,3 4,2 0 4 4,2 4,4 4,6 4,8 -40 5 0 40 Sense Thresholds VST versus Junction Temperature TJ 6 1,4 5 1,35 4 1,3 VST [V] VSO [V] Sense Output Voltage VSO versus Sense Input Voltage VSI 3 1,25 2 1,2 1 1,15 0 1,1 1,2 1,3 1,4 1,1 1,5 -40 VSI [V] Data Sheet 120 TJ [°C] VOUT [V] 1 80 0 40 8
IFX4949 Application Information 5 Application Information Note: The following information is given as a hint for the implementation of the device only and shall not be regarded as a description or warranty of a certain functionality, condition or quality of the device. Application_diagram .vsd PRE Preregulator 5V VBatt IN OUT RO Reset Bandgap Reference SO SI GND Figure 3 D Application Diagram Note: This is a very simplified example of an application circuit.
IFX4949 Application Information Voltage Regulator The voltage regulator uses a PNP transistor as a regulation element. With this structure a very low dropout voltage at currents of up to 100mA is obtained. The dropout operation of the standby regulator is maintained down to 3.5V input supply voltage. The output voltage is regulated up to a transient input supply voltage of 40V. With this feature no functional interruption due to over voltage pulses is generated.
IFX4949 Application Information 6,00 TJ = 25 V 5,00 VOUT [V] 4,00 3,00 2,00 1,00 0,00 0 0,05 0,1 0,15 0,2 0,25 0,3 IOUT [A] Figure 6 Foldback Characteristics of VOUT Preregulator To improve the transient immunity a preregulator stabilizes the internal supply voltage to 5V. This internal voltage is also present at the PRE pin (Pin 3). This voltage should not be used as an output because the output capability is very small (≤ 10 µA).
IFX4949 Application Information Reset .vsd 2uA Ref 1,23V 22K Reset D OUT 2.0V VReg Figure 7 Reset Circuit The reaction time of the reset circuit corresponds to its noise immunity. Standby output voltage drops below the reset threshold that are only marginally longer than the reaction time will result in a shorter reset delay times. The nominal reset delay time will be generated for standby output voltage drops longer than approximately 50µs.
IFX4949 Application Information Sense Comparator The sense comparator compares an input signal with the internal voltage reference of typical 1.23V. The use of an external voltage divider makes this comparator very flexible in the application. It can be used to supervise the input voltage either before or after a protection diode and to give additional informations to the microprocessor like low voltage warnings. Data Sheet 18 Rev. 1.
IFX4949 Package Outlines 6 Package Outlines 0.1 2) 0.41+0.1 -0.06 0.2 8 5 1 4 5 -0.2 1) M B 0.19 +0.06 C 8 MAX. 1.27 4 -0.21) 1.75 MAX. 0.175 ±0.07 (1.45) 0.35 x 45˚ 0.64 ±0.25 6 ±0.2 A B 8x 0.2 M C 8x A Index Marking 1) Does not include plastic or metal protrusion of 0.15 max. per side 2) Lead width can be 0.61 max.
IFX4949 Revision History 7 Revision History Revision Date Changes 1.0 2012-05-07 Data Sheet – Initial Release. Data Sheet 20 Rev. 1.
Edition 2012-05-07 Published by Infineon Technologies AG 81726 Munich, Germany © 2012 Infineon Technologies AG All Rights Reserved. Legal Disclaimer The information given in this document shall in no event be regarded as a guarantee of conditions or characteristics.
