Datasheet L4952D Datasheet (SGS Thomson Microelectronics)

L4952

VOLTAGE REGULATOR FOR CAR RADIO APPLICATIONS

OPERATIONSUPPLY VOLTAGE9.5 TO 28V
PEAK SUPPLY OVERVOLTAGE PULSE UP

TO 52V (VS. GND)
FIXED OUTPUT VOLTAGE OF 8.6±0.2V

AND OUTPUT CURRENTUP TO 150mA
VERY LOW DROP OUTPUT STAGE WITH

LOW OUTPUTVOLTAGE DIAGNOSTIC
OUTPUT SHORT CIRCUIT AND THERMAL

OVERLOADPROTECTION
VERY LOW STANDBY CURRENT (DEVICE

DISABLED)
TWO INTERNAL OUTPUT VOLTAGE

SWITCHES WITH LOW DROPOUT FOR
AM/FM SWITCHING

DRIVER CIRCUIT FOR EXTERNAL HIGH
SIDE SWITCHWITH DROPMONITORING

ENABLE INPUT TO SWITCH ON THE DE­VICE

ADDITIONAL 10V VERY LOW DROP REGU­LATOR TO SUPPLY THE VARICAP

DESCRIPTION

The L4952 is a monolithic voltage regulatorin an
advanced BCD60II process with high efficient p­channel transistor. This device is optimized for
Car Radio applications to obtain optimum per­formance and supply systemintegrationwith high
flexibilityand minimumperipheralcomponents.

June 2000



BLOCK DIAGRAM

SO20 (12+4+4)

ORDERING NUMBER:

L4952D

1/8

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

V

s

DC supply voltage -2.2 .. +28 V

V

st

Transient operating supply voltage for t = 400ms -2.2 .. +52 V

V

o1,2,3,4

Output voltages -0.3 .. +12 V

V

EN

Input voltage of EN -0.3 .. +18 V

V

IND

Input voltage for EN2, EN3, HSON -18 .. +18 V

V

s-VIND

Max Voltage Difference between Vsand logic inputs EN2,
EN3,HSON

52 V

V

DIAG

Diagnostic output -0.3 .. +20 V

I

o1

Output current out1, out4 short circuit protected mA

I

o2,3

Output current out2,3 (Note 1) internally limited mA

I

oDIAG

Output current Diagnostic 10 mA

I

HSSD

Driver currentfor external pnp High side switch internally limited mA

T

J

Operating junction temperature -40 .. +150 °C

P

o

Power dissipation with on board heat sink 2cm

2

1W

V

ESD

ESD voltage capability ( MIL 883 C ) ±2000 V

Note: Current limiter of OUT1 will alsoprotectOUT2andOUT3aslongasOUT1is notreverse supplied.Output capacitors upto100µFbetween

OUT and GND will not harm this protection.

THERMAL DATA

Symbol Parameter Value Unit

R

th j-amb

Thermal ResistanceJunction to Ambient with on board heatsink
2cm

2

60 °C/W

T

JSD

Thermal shutdownjunction temperature >150 °C

OUT1
OUT3

EN3
GND
GND

GND

GND

EN2

OUT2 OUT4

DIAG

GND

GND
GND

GND

HSSD

HSSS

HSON1

3

2

4
5
6
7
8
9

18
17
16
15
14

12

13

11

19

10

20

V

S

EN

D95AU401A

PIN CONNECTION

L4952

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FUNCTIONAL 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 applicationsin 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 overtemperatureprotection.
For automatic PCB assembly the package is
SO12+4+4.To use the maximalcurrent of 150mA
a small copper area of 2cm

2

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

ELECTRICALCHARACTERISTICS

(V

s

= 14V; TJ=25°Cunless otherwise specified)

Symbol Parameter Test Condition Min. Typ. Max. Unit

I

s

VsQuiescent current no Load 1.6 5 mA

I

ssb

Vsstandby current EN = 0V 0 20 µA

V

INLEN

Low Voltage EN -0.3 0.5 V

V

INHEN

High Voltage EN VS= 18V 3.5 18 V

V

IN L EN2,3

EN2, EN3, Low Voltage -18 1.05 V

V

IN H EN2,3

EN2, EN3, High Voltage VS= 18V 1.45 18 V

V

IN LHSON

HSON Low Voltage -18 1.0 V

V

IN H HSON

HSON High Voltage VS= 18V 2.0 18 V

I

INH

Current EN2, EN3, HSON VIn=5V 30 70 µA

I

INL

Current EN2, EN3, HSON VIn= 0V -10 10

µ

A

I

IN ON/OFF

Current High EN VIn= 5V -10 100 200 µA

Voltage Regulator (OUT 1)

V

o1

Output voltage no load 8.4 8.6 8.8 V

V

DP1

Dropout voltage Vs= 8.4V, V

DP1=Vs-Vout1

Io1= 0.15A, I

02,3

= 0mA 0.16 0.6 V

I

o1

= 0.1A, I

02,3

= 0mA 0.11 0.4 V

I

o1

= 0.05A, I

02,3

= 0mA 0.06 0.2 V

SVRR Supply Voltage ripple rejection f = 100Hz, C = 10µF ESR = 5Ω 60 70 dB

V

oLo

Load regulation 10mA < Io< 150 mA 30 60 mV

I

oLim1

Current limits V

OUT

= 8V 150 300 800 mA

Voltage Regulator (OUT 4)

V

o4

Output voltage no load 9.5 10.0 10.5 V

V

DP4

Dropout voltage I = 3mA Vs= 8.6V 0.14 0.3 V

I = 1.5mA V

s

= 8.6V 0.075 0.15 V

SVRR Supply Voltage ripple rejection f = 100Hz C = 10µF ESR = 5

Ω

30 60 dB

V

o4Lo

Load regulation 0.5mA < I < 3 mA 100 mV

I

o4Lim

Current limits V

OUT

=8V 8 60 mA

Diagnostic Output

V

LDIAG

Output Diagnostic Low voltage R

DIAG

to 5 V = 10K

Ω

0.4 V

∆V

out

Output voltage drop before
diagnostic activation

VS>6VIO1= 100mA
I

O2=IO3

= 0mA

30 200 mV

Voltage Switches Vout2/3

V

DP2

Dropout V

out2

Io2= 50mA, En2= H 0.25 0.5 V
I

o2

= 25mA, En2= H 0.125 0.25 V

V

DP3

Dropout V

out3

Io3= 75mA, En3= L 0.25 0.5 V
I

o3

= 40mA, En3= L 0.14 0.28 V

High Side Switch Driver

V

DPHS

Low Drop Voltage I

out

= 50mA, HSON = H 0.26 0.8 V

V

DPHS

Drop detection threshold V

Dth=VS-V14

, HSON = H 0.7 1 1.3 V

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Figure 1: Application CircuitDiagram

Figure 2.

Figure 3.

L4952

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is High the device is switched on. The diagnostic
circuitrydetect 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 controlit thereare twodigitalinputsEn

2

andEn

3

one for each switch. EN2is Highactive and EN3is
Low active. It’s possible to drive the AM/FM switch
withonedigitalline (EN

2

andEN3together).
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 secondvery low drop 10 V regulator is
available. This regulator in dropout has a typical
resistance of 50Ω.

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).

Thesignalon the HSON pin of the L4952 is shown
on curve 2. At t1 the external Power pnp is
switched on. At t2 (V

HSON

=V

SON2

) the internal
comparatorcomparesthe drop of the externalpnp.
Incase of normaloperationthe dropis smallerthan
V

Dth

andno failurewillbedetected(curve3).

In case of failure (that mean a higher drop than
V

Dth

) 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 (V

HSON<VSON1

) again.

Figure4: Logicinput currents versus input

voltage

Figure 3: Stand by consumptionversus

temperature

Supply voltage rejection (C = 10µF, ESR = 4.7Ω,
Load at OUT4 = 10kΩ)

Figure 5:

Supplyrejection versus Frequency.

OUT2propagationdelay (Load= 100Ω)

Figure6:

OUT2propagationdelay (Load = 100Ω)

TypicalCharacteristics (Note4)

L4952

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Note 4

Typical charcteristics shown by the Figures 3 to
12 are typical parameters. Depending on produc-

tion spread certain deviations may occure. For
limits see pages 2 to 4.

Figure10: OUT1 voltage versus temperature

Figure 9: (C = 10µF, ESR = 4.7Ω Load current

0mA and 117mA)

Figure 11: OUT4supply transient response

(C = 10µF, ESR = 4.7Ω, Load = 3mA)

Figure12:

OUT4voltage versus temperature

Figure 7:

OUT3propagation delay (Load = 100Ω)

Figure8:

OUT1supply transient rejection

(C= 10µF, ESR = 4.7Ω, Load at OUT1
= 100Ω, Load = 10kΩ)

L4952

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110

1120

A

e

B

D

E

L

K

H

A1

C

SO20MEC

hx45°

SO20

DIM.

mm inch

MIN. TYP. MAX. MIN. TYP. MAX.

A 2.35 2.65 0.093 0.104

A1 0.1 0.3 0.004 0.012

B 0.33 0.51 0.013 0.020

C 0.23 0.32 0.009 0.013

D 12.6 13 0.496 0.512

E 7.4 7.6 0.291 0.299

e 1.27 0.050

H 10 10.65 0.394 0.419

h 0.25 0.75 0.010 0.030

L 0.4 1.27 0.016 0.050

K0°(min.)8° (max.)

OUTLINE AND

MECHANICAL DATA

L4952

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