L4952 [STMICROELECTRONICS]
VOLTAGE REGULATOR FOR CAR RADIO APPLICATIONS; 电压调节器汽车无线电应用
| 型号： | L4952 |
| 厂家： | 
ST |
| 描述： | VOLTAGE REGULATOR FOR CAR RADIO APPLICATIONS |
| 文件： | 总8页 (文件大小：87K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
L4952
VOLTAGE REGULATOR FOR CAR RADIO APPLICATIONS
OPERATION SUPPLY VOLTAGE9.5 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
OVERLOADPROTECTION
SO20 (12+4+4)
VERY LOW STANDBY CURRENT (DEVICE
DISABLED)
ORDERING NUMBER:
L4952D
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 DE-
VICE
ADDITIONAL 10V VERY LOW DROP REGU-
LATOR TO SUPPLY THE VARICAP
DESCRIPTION
The L4952 is a monolithic voltage regulator in an
advanced BCD60II process with high efficient p-
channel transistor. This device is optimized for
Car Radio applications to obtain optimum per-
formance and supply system integration with high
flexibility and minimum peripheral components.
BLOCK DIAGRAM
1/8
June 2000
L4952
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
-2.2 .. +28
-2.2 .. +52
-0.3 .. +12
-0.3 .. +18
-18 .. +18
52
Unit
V
Vs
Vst
DC supply voltage
Transient operating supply voltage for t = 400ms
Output voltages
V
Vo1,2,3,4
VEN
V
Input voltage of EN
V
VIND
Input voltage for EN2, EN3, HSON
V
Vs -VIND
Max Voltage Difference between Vs and logic inputs EN2,
EN3, HSON
V
VDIAG
Io1
Diagnostic output
-0.3 .. +20
short circuit protected
internally limited
10
V
Output current out1, out4
mA
mA
mA
mA
°C
W
Io2,3
IoDIAG
IHSSD
TJ
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 )
internally limited
-40 .. +150
1
Po
VESD
±2000
V
Note: Current limiterof OUT1 will alsoprotect OUT2and OUT3 aslong as OUT1 is notreverse supplied.Outputcapacitors up to100µF between
OUT and GND will not harm this protection.
PIN CONNECTION
OUT1
OUT3
EN3
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
HSON
HSSS
HSSD
GND
GND
GND
GND
DIAG
OUT4
EN
GND
GND
GND
GND
EN2
OUT2
VS
D95AU401A
THERMAL DATA
Symbol
Parameter
Value
Unit
Rth j-amb
Thermal Resistance Junction to Ambient with on board heatsink
2cm2
60
°C/W
TJSD
Thermal shutdown junction temperature
>150
°C
2/8
L4952
ELECTRICAL CHARACTERISTICS
(Vs = 14V; TJ = 25°C unless otherwise specified)
Symbol
Is
Parameter
Vs Quiescent current
Vs standby current
Test Condition
no Load
Min.
Typ.
1.6
0
Max.
5
Unit
mA
µA
V
Issb
EN = 0V
VS = 18V
VS = 18V
20
VINLEN
VINHEN
VIN L EN2,3
VIN H EN2,3
VIN L HSON
VIN H HSON
IINH
Low Voltage EN
-0.3
3.5
0.5
18
High Voltage EN
V
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
-18
1.45
-18
2.0
1.05
18
V
V
1.0
18
V
VS = 18V
VIn = 5V
VIn = 0V
VIn = 5V
V
30
100
8.6
70
µA
IINL
-10
-10
10
A
µ
IIN ON/OFF
200
µA
Voltage Regulator (OUT 1)
Vo1
Output voltage
Dropout voltage
no load
8.4
8.8
V
VDP1
Vs = 8.4V, VDP1= Vs - Vout1
Io1= 0.15A, I02,3 = 0mA
Io1= 0.1A, I02,3 = 0mA
Io1= 0.05A, I02,3 = 0mA
f = 100Hz, C = 10µF ESR = 5Ω
10mA < Io < 150 mA
VOUT = 8V
0.16
0.11
0.06
70
0.6
0.4
0.2
V
V
V
SVRR
VoLo
Supply Voltage ripple rejection
Load regulation
60
150
9.5
dB
mV
mA
30
60
IoLim1
Current limits
300
800
Voltage Regulator (OUT 4)
Vo4
Output voltage
Dropout voltage
no load
10.0
0.14
0.075
60
10.5
0.3
V
V
VDP4
I = 3mA Vs = 8.6V
I = 1.5mA Vs = 8.6V
0.15
V
SVRR
Vo4Lo
Io4Lim
Supply Voltage ripple rejection
Load regulation
f = 100Hz C = 10 F ESR = 5
30
8
dB
mV
mA
µ
Ω
0.5mA < I < 3 mA
VOUT = 8V
100
60
Current limits
Diagnostic Output
VLDIAG
Output Diagnostic Low voltage
RDIAG to 5 V = 10K
0.4
V
Ω
∆Vout
Output voltage drop before
diagnostic activation
VS > 6V IO1 = 100mA
IO2 = IO3 = 0mA
30
200
mV
Voltage Switches Vout2/3
VDP2
Dropout Vout2
Dropout Vout3
Io2 = 50mA, En2 = H
Io2 = 25mA, En2 = H
Io3 = 75mA, En3 = L
Io3 = 40mA, En3 = L
0.25
0.125
0.25
0.5
0.25
0.5
V
V
V
V
VDP3
0.14
0.28
High Side Switch Driver
VDPHS
VDPHS
Low Drop Voltage
Drop detection threshold
Iout = 50mA, HSON = H
0.26
1
0.8
1.3
V
V
VDth = VS - V14, HSON = H
0.7
pnp switch, a discharge circuitry for theft detec-
tion and a overtemperatureprotection.
For automatic PCB assembly the package is
SO12+4+4. To use the maximal current of 150mA
a small copper area of 2cm2 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
FUNCTIONAL DESCRIPTION
The L4952 is a monolithic voltage regulator with
an output voltage of typically 8.6V and a maxi-
mum output current of 150mA. It ’s a device for
audio applicationsin carradios.
The device contain a precision Bandgap refer-
ence, a output amplifier with overcurrent protec-
tion, two voltage switches, a driver for an external
3/8
L4952
Figure 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.
Function of the external High side switch
driver
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 cir-
cuitry on or off.
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
comparatorcompares the drop of the external pnp.
In case of normaloperation 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.
To controlit thereare twodigitalinputsEn2 andEn3
one for each switch. EN2 is High active and EN3 is
Low active. It’s possible to drive the AM/FM switch
with onedigital line (EN2 andEN3 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-opampof 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 4: Logic input currents versus input
Figure 3: Stand by consumption versus
voltage
temperature
OUT2 propagationdelay (Load = 100Ω)
Supply voltage rejection (C = 10µF, ESR = 4.7Ω,
Load at OUT4 = 10kΩ)
Figure 6:
Ω
OUT2 propagationdelay (Load = 100 )
Figure 5:
Supply rejection versus Frequency.
5/8
L4952
Figure 8:
OUT1 supply transient rejection
(C = 10µF, ESR= 4.7Ω, Load at OUT1
= 100Ω, Load = 10kΩ)
Figure 7:
Ω
OUT3 propagationdelay (Load = 100 )
Figure 9: (C = 10µF, ESR = 4.7Ω Load current
Figure 10: OUT1 voltage versus temperature
0mA and 117mA)
Figure 11: OUT4 supply transient response
(C = 10µF, ESR = 4.7Ω, Load = 3mA)
Figure 12:
OUT4 voltage versus temperature
Note 4
tion spread certain deviations may occure. For
limits see pages 2 to 4.
Typical charcteristics shown by the Figures 3 to
12 are typical parameters. Depending on produc-
6/8
L4952
mm
inch
OUTLINE AND
MECHANICAL DATA
DIM.
MIN. TYP. MAX. MIN. TYP. MAX.
A
A1
B
C
D
E
e
2.35
0.1
2.65 0.093
0.3 0.004
0.104
0.012
0.020
0.013
0.512
0.299
0.33
0.23
12.6
7.4
0.51 0.013
0.32 0.009
13
0.496
0.291
7.6
1.27
0.050
H
h
10
0.25
0.4
10.65 0.394
0.75 0.010
0.419
0.030
0.050
L
1.27 0.016
SO20
K
0° (min.)8° (max.)
L
h x 45°
A
A1
K
B
C
e
H
D
20
11
E
1
10
SO20MEC
7/8
L4952
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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.
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