SGS Thomson Microelectronics L4954 Datasheet
VOLTAGEREGULATOR FOR CAR RADIO
4 REGULATORS
10V (40mA);8.5V(175mA); 5V(650mA);
5V (100mA)STANDBY
10V AND 5V STAND BY REGULATORS ARE
LOW DROPOUTOUTPUTS
3 HIGH SIDEDRIVERS:
2A (HSD1), 0.3A(HSD2 & HSD3)
NO EXTERNAL CHARGE PUMP CAPACITORS ARE REQUIRED
STAND BY MODE CONTROLLED BY 3 INPUT PINS:
EN1 FOR REG1, REG2, REG3 AND HSD1,
EN2 FOR HSD2,AND EN3 FOR HSD3
INDIVIDUALTHERMALSHUTDOWN
LOGIC OUTPUTS FOR SUPPLY UNDER-
VOLTAGE:(LVWARN, RESET)
INDEPENDENT CURRENT LIMITING
OVERVOLTAGESHUTDOWN
SHORTCIRCUITPROTECTION
LOAD DUMP PROTECTION AND OVERVOL-
TAGE SHUTDOWN
DESCRIPTION
L4954 is a quad output voltage regulator and a
L4954
QUAD MULTIFUNCTION
Multiwatt15
ORDERING NUMBER: L4954
three outputhigh side driver.
The IC includes monitoring circuitry to warn the
microprocessorof a low voltagecondition:
the LVWarn, output, sensing the slow dropping of
STCAP pins voltage, gives the microprocessor
time to storedata.
A RESEToutput is generatedat REG4’sdecay.
External protection must be provided for reverse
batteryprotection.
BLOCK DIAGRAM
June 2000
STCAP
RESET
LVWarn
EN1
EN2
EN3
GND
V
S
VOLTAGE
REFERENCE
CURRENT
LIMIT
RESET
LVW
OUTPUT
CONTROL
THERMAL
SHUTDOWN
OVERVOLTAGE
PROTECTION
REG1
10V, 40mA
REG2
8.5V, 175mA
REG3
5V, 650mA
REG4
5V, 100mA
HSD1
2.0A
HSD2
0.3A
HSD3
0.3A
10V-REG1
8.5V-REG2
5V-REG3
5V-REG4-STBY
HSD1
HSD2
HSD3
D95AU346
1/7
L4954
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
V
S
V
S
V
S,ovs
V
in
V
out
T
op
T
stg
PIN CONNECTION
DC Operating Supply Voltage -0.6 to 26.5 V
Transient Supply Overvoltages, rise time = 10ms
34 V
delay time =115ms
Overvoltage Shutdown 27 V
Input Voltages (EN1, EN2, EN3) -0.6 to 6.0 V
Output Voltages (LVWarn, RESET) -0.6 to 6.0 V
Operating TemperatureRange -40 to 85 °C
Storage Temperature Range -40 to 150
C
°
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
TAB CONNECTED TO PIN 8
D95AU347
10V REG1
8.5V REG2
5V REG3
EN3
EN2
EN1
RESET
GND
LVWarn
5V REG4-STBY
ST CAP
HSD3-0.3A
HSD2-0.3A
V
S
HSD1-2A
THERMAL DATA
Symbol Parameter Value Unit
R
th j-case
Thermal Resistance Junction-case 2
APPLICATIONCIRCUIT
+V
S
1000µF 0.1µF
EN1
EN2
10
11
12EN3
1HSD1
3HSD2
4HSD3
2
L4954
15
10µF(*)
14
10µF(*)
13
10µF(*)
6
10µF(*)
47KΩ 47KΩ
10V-REG1
8.5V-REG2
5V-REG3
5V-REG4
-STBY
C/W
°
2/7
7
5STCAP
470µF
(*)ESR ofoutput capacitors shouldbe between0.2Ω to5.0Ω
8
9
0.1µF
LVWarn
RESET
0.1µF
D95AU348C
L4954
ELECTRICALCHARACTERISTICS
I
OUT10
= 5mA; I
OUT8.5
= 5mA; I
OUT5
(Refer to theapplicationcircuit, V
= 5mA; I
OUT5 ST-BY
= 0.5mA;R
HSD1
= 14.4V;T
S
=16Ω,R
amb
HSD2,3
=25°C;
= 107Ω,
unless otherwisespecified.)
Symbol Parameter Test Condition Min. Typ. Max. Unit
V
S
Iq Maximum Quiescent Current I
I
q,ST-BY
V
ENL
Operating Supply Voltage 11 16 V
=40mA; I
OUT10
I
= 650mA;
OUT5
I
OUT5ST-BY
R
HSD2,3
= 100mA;R
=53
Ω
OUT8.5
Standby Quiescent Current EN1, EN2, EN3 = 0
I
OUT5, ST-BY
= 50mA;
EN1, EN2, EN3 = 0
I
OUT5, ST-BY
= 2mA;
EN1, EN2, EN3 Input Low
=175mA;
=8Ω;
HSD1
0 0.8 V
10 mA
420
300 µA
Voltage
V
ENH
EN1, EN2, EN3 Input High
25V
Voltage (Outputs Active)
10V / 40mAREG 1 OUTPUT
V
OUT10
V
∆
∆V
V
DROPOUT
I
q1
I
lim1
SVR
line
load
Output Voltage I
= 40mA 10 V
OUT10
Line Regulation VS= 11 to 26V 2 mV
Load Regulation I
Dropout Voltage VS=V
Reg 1Quiescent Current I
= 5 to 40mA 2 mV
out10
+ 0.1V
OUT10
I
= 5mA
out10
V
S=VOUT10
I
out10
OUT10
I
OUT10
+ 0.5V
= 40mA
=5mA 7 mA
=40mA 7 mA
100 200 mV
500 600 mV
Current Limit 100 mA
Reg 1Supply Voltage Rejection f = 0.12 to 10KHz;
1
I
OUT10
=25mA; V
RIP
=1V
pp
55 dB
8.5V / 175mAREG 2 OUTPUT
V
OUT8.5
∆V
V
∆
V
DROPOUT
I
q2
I
lim2
SVR
line
load
Output Voltage I
= 175mA 8.5 V
OUT8.5
Line Regulation VS= 11 to 26V 2 mV
Load Regulation I
Dropout Voltage VS=V
Reg 2 QuiescentCurrent I
= 5 to175mA 10 mV
out8.5
+ 0.3V
OUT8.5
I
= 5mA
out8.5
V
S=VOUT8.5
I
out8.5
OUT8.5
I
OUT8.5
+1V
= 175mA
= 5mA 7 mA
= 175mA 7 mA
300 400 mV
1 1.1 V
Current Limit 300 mA
Reg 1Supply Voltage Rejection f = 0.12 to 10KHz;
2
I
OUT8.5
= 100mA; V
RIP
=1V
pp
55 dB
A
µ
3/7
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