L4952

® L4952 VOLTAGE REGULATOR FOR CAR RADIO APPLICATIONS OPERATION SUPPLY VOLTAGE 9.5 TO 28V PEAK SUPPLY OVERVOLTAGE PULSE UP TO 52V (VS. GND) FIXED OUTPUT VOLTAGE OF 8.6 ± 0.2V AND OUTPUT CURRENT UP TO 150mA VERY LOW DROP OUTPUT STAGE WITH LOW OUTPUT VOLTAGE DIAGNOSTIC OUTPUT SHORT CIRCUIT AND THERMAL OVERLOAD PROTECTION VERY LOW STANDBY CURRENT (DEVICE DISABLED) TWO INTERNAL OUTPUT VOLTAGE SWITCHES WITH LOW DROPOUT FOR AM/FM SWITCHING DRIVER CIRCUIT FOR EXTERNAL HIGH SIDE SWITCH WITH DROP MONITORING ENABLE INPUT TO SWITCH ON THE DEVICE ADDITIONAL 10V VERY LOW DROP REGULATOR TO SUPPLY THE VARICAP BLOCK DIAGRAM SO20 (12+4+4) ORDERING NUMBER: L4952D DESCRIPTION The L4952 is a monolithic voltage regulator in an advanced BCD60II process with high efficient pchannel transistor. This device is optimized for Car Radio applications to obtain optimum performance and supply system integration with high flexibility and minimum peripheral components. June 2000 1/8 L4952 ABSOLUTE MAXIMUM RATINGS Symbol Vs Vst Vo1,2,3,4 V EN VIND Vs -VIND VDIAG Io1 Io2,3 IoDIAG IHSSD TJ Po VESD DC supply voltage Transient operating supply voltage for t = 400ms Output voltages Input voltage of EN Input voltage for EN2, EN3, HSON Max Voltage Difference between Vs and logic inputs EN2, EN3, HSON Diagnostic output Output current out1, out4 Output current out2,3 (Note 1) Output current Diagnostic Driver current for external pnp High side switch Operating junction temperature Power dissipation with on board heat sink 2cm2 ESD voltage capability ( MIL 883 C ) Parameter Value -2.2 .. +28 -2.2 .. +52 -0.3 .. +12 -0.3 .. +18 -18 .. +18 52 -0.3 .. +20 short circuit protected internally limited 10 internally limited -40 .. +150 1 ±2000 Unit V V V V V V V mA mA mA mA °C W V Note: Current limiter of OUT1 will also protect OUT2 and OUT3 as long as OUT1 is notreverse supplied.Output capacitors up to 100µF between OUT and GND will not harm this protection. PIN CONNECTION OUT1 OUT3 EN3 GND GND GND GND EN2 OUT2 VS 1 2 3 4 5 6 7 8 9 10 D95AU401A 20 19 18 17 16 15 14 13 12 11 HSON HSSS HSSD GND GND GND GND DIAG OUT4 EN THERMAL DATA Symbol Rth j-amb TJSD Parameter Thermal Resistance Junction to Ambient with on board heatsink 2cm2 Thermal shutdown junction temperature Value 60 >150 Unit °C/W °C 2/8 L4952 ELECTRICAL CHARACTERISTICS (Vs = 14V; TJ = 25°C unless otherwise specified) Symbol Is Issb VINLEN VINHEN VIN L EN2,3 VIN H EN2,3 VIN L HSON VIN H HSON IINH IINL IIN ON/OFF V o1 VDP1 Parameter Vs Quiescent current Vs standby current Low Voltage EN High Voltage EN EN2, EN3, Low Voltage EN2, EN3, High Voltage HSON Low Voltage HSON High Voltage Current EN2, EN3, HSON Current EN2, EN3, HSON Current High EN Output voltage Dropout voltage VS = 18V VIn = 5V VIn = 0V VIn = 5V no load Vs = 8.4V, VDP1= Vs - Vout1 Io1= 0.15A, I02,3 = 0mA Io1= 0.1A, I02,3 = 0mA Io1= 0.05A, I02,3 = 0mA SVRR VoLo IoLim1 V o4 VDP4 SVRR Vo4Lo Supply Voltage ripple rejection Load regulation Current limits Output voltage Dropout voltage Supply Voltage ripple rejection Load regulation f = 100Hz, C = 10µF ESR = 5Ω 10mA < Io < 150 mA VOUT = 8V no load I = 3mA Vs = 8.6V I = 1.5mA Vs = 8.6V f = 100Hz C = 10µF ESR = 5Ω 0.5mA < I < 3 mA VOUT = 8V R DIAG to 5 V = 10KΩ VS > 6V IO1 = 100mA IO2 = IO3 = 0mA Io2 = 50mA, En2 = H Io2 = 25mA, En2 = H VDP3 Dropout Vout3 Io3 = 75mA, En3 = L Io3 = 40mA, En3 = L High Side Switch Driver VDPHS VDPHS Low Drop Voltage Drop detection threshold Iout = 50mA, HSON = H VDth = VS - V14, HSON = H 0.7 0.26 1 0.8 1.3 V V 30 8 30 150 9.5 60 0.16 0.11 0.06 70 30 300 10.0 0.14 0.075 60 100 60 0.4 200 60 800 10.5 0.3 0.15 0.6 0.4 0.2 V V V dB mV mA V V V dB mV mA V mV -10 -10 8.4 100 8.6 VS = 18V VS = 18V Test Condition no Load EN = 0V -0.3 3.5 -18 1.45 -18 2.0 30 Min. Typ. 1.6 0 Max. 5 20 0.5 18 1.05 18 1.0 18 70 10 200 8.8 Unit mA µA V V V V V V µA µA µA V Voltage Regulator (OUT 1) Voltage Regulator (OUT 4) Current limits Io4Lim Diagnostic Output VLDIAG ∆Vout Output Diagnostic Low voltage Output voltage drop before diagnostic activation Voltage Switches Vout2/3 VDP2 Dropout Vout2 0.25 0.125 0.25 0.14 0.5 0.25 0.5 0.28 V V V V F UNCTIONAL DESCRIPTION The L4952 is a monolithic voltage regulator with an output voltage of typically 8.6V and a maximum output current of 150mA. It ’s a device for audio applications in carradios. The device contain a precision Bandgap reference, a output amplifier with overcurrent protection, two voltage switches, a driver for an external pnp switch, a discharge circuitry for theft detection and a overtemperature protection. For automatic PCB assembly the package is SO12+4+4. To use the maximal current of 150mA 2 a small copper area of 2cm as heat sink on board (Rth=60K/W) is necessary. The device has a very low quiescent current in standby mode. If the digital Input EN is Low the device is switched off (stand by mode) and if EN 3/8 L4952 F igure 1: Application Circuit Diagram Figure 2. Figure 3. 4/8 L4952 is High the device is switched on. The diagnostic circuitry detect the low drop voltage. In this case the DIAG output is going low and can mute the power output stage to avoid noise on the loudspeaker.The two internal switches can switch the stabilized output voltage with P-MOS Transistors to one of the outputs 2 and 3 with low drop. This is useful to switch the AM and FM circuitry on or off. To control it there are two digital inputs En2 and En3 one for each switch. EN2 is High active and EN3 is Low active. It’s possible to drive the AM/FM switch with one digital line (EN2 and EN3 together). The driver for the external High side switch can switch on and off the external pnp transistor. The drop detection circuitry avoid the damage of the external power pnp transistor. To supply the varicaps and the PLL-opamp of the car radio a second very low drop 10 V regulator is available. This regulator in dropout has a typical resistance of 50Ω. Typical Characteristics (Note 4) Figure 3: Stand by consumption versus temperature Function of the external High side switch driver Fig 2 shows the principle circuitry of the external High side switch. Fig. 3 shows the switch on/off phase of the external High side switch. At the time t0 the microcontroller switches on (curve 1 = output signal of the microcontroller). The signal on the HSON pin of the L4952 is shown on curve 2. At t1 the external Power pnp is switched on. At t2 (VHSON = VSON2) the internal comparator compares the drop of the external pnp. In case of normal operation the drop is smaller than VDth and no failure will be detected (curve 3). In case of failure (that mean a higher drop than VDth ) the external power pnp will be switched off (curve 4). If an error is detected it will be stored in the internal error flip-flop. The external pnp can only be switched on again after having turned HSON off (VHSON < VSON1) again. Figure 4: Logic input currents versus input voltage Supply voltage rejection (C = 10µF, ESR = 4.7Ω, Load at OUT4 = 10kΩ) Figure 5: Supply rejection versus Frequency. OUT2 propagation delay (Load = 100Ω) Figure 6: OUT2 propagation delay (Load = 100Ω) 5/8 L4952 Figure 7: OUT3 propagation delay (Load = 100Ω) Figure 8: OUT1 supply transient rejection (C = 10µF, ESR = 4.7Ω, Load at OUT1 = 100Ω, Load = 10kΩ) Figure 9: (C = 10µF, ESR = 4.7Ω Load current 0mA and 117mA) Figure 10: OUT1 voltage versus temperature Figure 11: OUT4 supply transient response (C = 10µF, ESR = 4.7Ω, Load = 3mA) Figure 12: OUT4 voltage versus temperature Note 4 Typical charcteristics shown by the Figures 3 to 12 are typical parameters. Depending on produc6/8 tion spread certain deviations may occure. For limits see pages 2 to 4. L4952 DIM. MIN. A A1 B C D E e H h L K 10 0.25 0.4 2.35 0.1 0.33 0.23 12.6 7.4 mm TYP. MAX. 2.65 0.3 0.51 0.32 13 7.6 1.27 10.65 0.75 1.27 0.394 0.010 0.016 MIN. 0.093 0.004 0.013 0.009 0.496 0.291 inch TYP. MAX. 0.104 0.012 0.020 0.013 0.512 0.299 0.050 0.419 0.030 0.050 OUTLINE AND MECHANICAL DATA 0° (min.)8° (max.) SO20 L h x 45° A B e K H D A1 C 20 11 E 1 1 0 SO20MEC 7/8 L4952 I nformation furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics © 2000 STMicroelectronics – Printed in Italy – All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - China - Finland - France - Germany - Hong Kong - India - Italy - Japan - Malaysia - Malta - Morocco Singapore - Spain - Sweden - Switzerland - United Kingdom - U.S.A. http://www.st.com 8/8