Dual Low Drop Voltage Regulator TLE 7469 Features • • • • • • • • • • • • • • • Dual output 5 V (±2%), 215mA and 2.6 V1) (±4%), 200mA or 5 V (±2%), 215mA and 3.
TLE 7469 The voltage regulator features an integrated reset circuitry which monitors the 2.6 V/ 3.3 V supply voltage. At power on the reset checks both supply voltages and performs the power-on reset with an adjustable delay time. The voltage difference is kept in the range -0.5 V < (VQ1 - VQ2) < 3.0 V even during power-on and power-down time enabling save µC operation without external clamping. Using the integrated early warning comparator an external voltage can be supervised.
TLE 7469 I2 TLE 7469 12 10 Q2 Q1 Overtemperature Shutdown Bandgap Reference Reset Generator and Window Watchdog 1 Charge Pump SI INH I1 5 7 8 2 9 Early Warning 4 RO WDI DT SO Inhibit 1 3 Q1 Overtemperature Shutdown 1 Charge Pump GND 11 Figure 1 Data Sheet AEB03530_1.VSD Block Diagram 3 Rev. 1.
TLE 7469 t PG-DSO-12 I1 1 12 I2 INH 2 11 GND Q1 3 10 Q2 SO 4 9 RO WDI 5 8 SI GND 6 7 DT AEP03531.VSD Figure 2 Pin Configuration (top view) Table 1 Pin Definitions and Functions Pin No. Symb. Function 1 I1 Input voltage 1; block to ground directly at the IC with a 100 nF ceramic capacitor 2 INH Inhibit Input; low level disables the IC. Integrated pull-down resistor 3 Q1 Output voltage 1; 5.
TLE 7469 Table 2 Absolute Maximum Ratings -40 °C < Tj < 150 °C Parameter Symbol Limit Values Unit Remarks Min. Max. VI1 II1 -0.3 45 V – – – mA Internally limited VI2 II2 -0.3 45 V – – – mA Internally limited VQ1 VQ1 IQ1 -0.3 5.5 V Permanent -0.3 6.2 V t < 10 s1) – 2 mA Internally limited VQ2 VQ2 IQ2 -0.3 5.5 V Permanent -0.3 6.2 V t < 10 s1) – – mA Internally limited VINH -0.3 45 V Observe current limit IINH -1 1 mA – VRO VRO IRO -0.3 5.
TLE 7469 Table 2 Absolute Maximum Ratings (cont’d) -40 °C < Tj < 150 °C Parameter Symbol Limit Values Unit Remarks Min. Max. VWDI VWDI IWDI -0.3 5.5 V Permanent -0.3 6.2 V t < 10 s1) – – mA internally limited VSI -0.3 45 V Observe current limit ISI -1 1 mA – VSO VSO ISO -0.3 5.5 V Permanent -0.3 6.
TLE 7469 Table 3 Operating Range Parameter Symbol Limit Values Unit Remarks Min. Max. 5.6 45 V – 6.0 45 V 4.2 45 V VI1 > 8V VI1 < 8V -40 150 °C – – 4.
TLE 7469 Table 4 Electrical Characteristics VI1 = 13.5 V; VI2 = 13.5 V; -40 °C < Tj < 150 °C; unless otherwise specified Parameter Symbol Limit Values Min. Typ. Max. Unit Test Condition Output Q1 Output voltage VQ1 4.90 5.0 5.10 V 1 mA < IQ1 < 215 mA, 6 V < VI1 < 16 V Output current limitation IQ1 320 – 700 mA VQ1 = 4.
TLE 7469 Table 4 Electrical Characteristics (cont’d) VI1 = 13.5 V; VI2 = 13.5 V; -40 °C < Tj < 150 °C; unless otherwise specified Parameter Symbol Limit Values Unit Test Condition IQ2 = IQ1 = 100 µA, Tj < 80 °C VINH = 0 V, Tj < 80 °C Min. Typ. Max. Quiescent current; Iq Iq = II1 + II2 - IQ1 - IQ2 – – 55 µA Iq – 5 9 µA VINH ON VINH OFF IINH ON IINH OFF – – 3.1 V 0.8 – – V – 3 4 µA – 0.
TLE 7469 Table 4 Electrical Characteristics (cont’d) VI1 = 13.5 V; VI2 = 13.5 V; -40 °C < Tj < 150 °C; unless otherwise specified Parameter Closed window time Window watchdog trigger time Symbol tCW tWD Limit Values Unit Test Condition Min. Typ. Max. 25.6 32.0 38.4 ms Fast Timing 102 128 154 ms Slow Timing 39.0 44.8 50.6 ms Fast Timing 156 179 202 ms Slow Timing 2.
TLE 7469 Table 4 Electrical Characteristics (cont’d) VI1 = 13.5 V; VI2 = 13.5 V; -40 °C < Tj < 150 °C; unless otherwise specified Parameter Symbol Limit Values Min. Typ. Max. 1.10 1.16 1.22 Unit Test Condition V VSI increasing (see Input Voltage Sense Sense threshold high VSIH Figure 4) Sense threshold low VSIL 1.06 1.12 1.18 V VSI decreasing (see Figure 4) Sense output low voltage VSOL – 0.1 0.4 V External SO pull-up resistor RSO ext 9.2 – – kΩ VSI < 1.01 V; VI1 > 4.
TLE 7469 Application Information R Vi * VBat TLE 7469 I2 47 µF Q2 100 nF 100 k Ω e. g. Ignition Key DT INH 47 µF 1 µF WDI RO SI XC 164 SO 10 kΩ Q1 I1 100 nF GND 1 µF = Optional Figure 3 47 µF AEA03529_2.VSD Application Diagram with Typical External Components A typical application of the TLE 7469 is shown in Figure 3. To prevent the regulation loop from oscillating a ceramic capacitor of CQ1/2 ≥ 1 µF is required at each of the outputs Q1 and Q2.
TLE 7469 Since the regulator output current roughly rises linearly with time the discharge of the capacitor can be calculated as follows: dVCB = dIQ*dt/CB The drop across the ESR calculates as: dVESR = dI*ESR To prevent a reset the following relationship must be fullfilled: dVC + dVESR < VRH2 = 130mV Example: Assuming a load current step of dIQ = 50mA, a blocking capacitor of CQ = 22µF and a typical regulator reaction time under normal operating conditions of dt ~ 25µs and for special dynamic load conditio
TLE 7469 The sense comparator output SO is an open collector. An appropriate external pull-up resistor is typ. 5.6 kΩ … 47 kΩ, the minimum value of 5.6 kΩ being defined by the max. sink current capability of the SO output transistor. If the sense comparator is not used the pull-up resistor can be spared. In this case the SI pin should be directly connected to Q1 in order to keep the comparator inactive.
TLE 7469 Circuit Description Power On Reset In order to avoid any system failure, a sequence of several conditions has to be passed. When the level of VQ2 reaches the reset threshold VRT, the signal at RO remains LOW for the Power-up reset delay time TRD. Then a second comparator checks whether VQ1 ≥ VRT1 and only if this test is passed the reset output is switched to HIGH. The Reset output is only released (set to High level) if both output voltages have passed their specific reset threshold VRT1/2.
TLE 7469 VI t VQ1 VRT1 t VQ2 VRT2 TRR VRO TRD t TRR TRD TRD VROH VROL t AET03532.VSD Figure 5 Reset Function and Timing Diagram Watchdog Operation The watchdog uses a fraction of the charge pump oscillator’s clock signal as timebase. Connecting the DT pin to Q1 or to Q2 the watchdog timebase can be adjusted. The watchdog can be turned off by a low level (VDT ≤ 0.8 V) applied to the DT pin. The timing values used in this text refer to typ. values with DT connected to Q1 (fast timing).
TLE 7469 the closed window is interpreted as a pretrigger failure and results in a reset. After the closed window the open window with the duration tOW is started again. The open window lasts at minimum until the trigger process has occurred, at maximum tOW is 32 ms (typ. value with fast timing). A HIGH to LOW transition of the watchdog trigger signal on pin WDI is taken as a trigger. To avoid wrong triggering due to parasitic glitches two HIGH samples followed by two LOW samples (sample period tsam typ.
TLE 7469 Vi/V t VQ/V VRT t VRO/V TRD TRD TRD Normal operation Power Fail trr t rr t Wnd Ingnore Wnd Don’t care WDI during IW WDI/V OW CW OW CW OW CW OW t (Wrong) Trigger in CW 1. Correct Trigger tWD,p OW No Trigger in OW t Figure 7 Window Watchdog Signal Flow Closed window Open window Watchdog trigger signal WDI Valid WDI Not valid t ECW Data Sheet Closed window t EOW = Watchdog decoder sample point Figure 8 Open window AET02952 Window Watchdog Definitions 18 Rev.
TLE 7469 0.8 Index Marking 1 12x 0.4 +0.13 0.25 M C A B 5˚ ±3˚ 35 Bottom View 7 6 6 0.25 B 12 1.6 ±0.1 (Metal) 4.2 ±0.1 (Metal) (1.8 Mold) 6.4 ±0.11) B (Mold) 7 +0.075 0.25 -0 .0 10.3 ±0.3 7.6 +0.13 -0.1 12 B 0.7 ±0.15 7.8 ±0.1 (Heatslug) (4.4 Mold) 0.1 7.5 ±0.11) (1.55) 0+0.1 STANDOFF 2.35 ±0.1 (Body) 2.6 MAX. Package Outlines 1 Heatslug 1 5x 1 = 5 5.1±0.1 (Metal) 1) Does not include plastic or metal protrusion of 0.15 max.
TLE 7469 Revision History Version Date Rev. 1.6 2008-01-22 Initial version of RoHS-compliant derivate of TLE 7469 Page 1: AEC certified statement added. Page 1 and Page 19: RoHS compliance statement and Green product feature added. Page 1 and Page 19: Package changed to RoHS compliant version. Rev. 1.5 2007-05-07 Modifications according to PCN No. 2007-070-A • Page 8: Parameter “Output current limitation IQ2” : Max. Value modified from 500mA to 550mA. • Page 3, Fig.
Edition 2008-01-22 Published by Infineon Technologies AG 81726 Munich, Germany © 2008 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.
