L4953K
MULTIFUNCTION VOLTAGE REGULATOR FOR CAR RADIO
3 OUTPUTS:
8.25V
(500mA);
5V
(1A);
5V
(100mA)
STANDBY
OUT1 (8.25V) AND OUT2 (5V) WITH INDE-
PENDENT ENABLE CONTROL FOR STAND-
BY MODE
1.5A HIGH SIDE DRIVER WITH CLAMPED
OUTPUT (16V)
LOGIC OUTPUT FOR:
SUPPLY UNDERVOLTAGE (LVW)
OVERVOLTAGE (FAULT)
THERMAL PROTECTION (FAULT)
RESET FUNCTION
IGNITION COMPARATOR
REVERSE BATTERY AND LOAD DUMP
PROTECTION
THERMAL SHUTDOWN
DESCRIPTION
The L4953K contains a triple voltage regulator
and a power switch.
The IC includes a monitoring circuit to warn if a
low voltage or no voltage condition is occuring.
In stand-by output is active as long as possible
even when in thermal shutdown or any other fault
conditions.
The STCAP pin allows the use of a reserve sup-
ply capacitor that will hold enough energy for the
5V Stand-by line to allow the
P to store data.
This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
June 2000
5V, 100mA
REGULATOR
STAND-BY
LOAD DUMP
AND REV
BATT PROT
REF
GEN
5V, 1000mA
REGULATOR
SWITCHED
8.25V, 500mA
REGULATOR
SWITCHED
16V, 1.5A
VOLTAGE CLAMP
SWITCHED
OVERVOLTAGE
UNDERVOLTAGE
THERMAL PROT
RESET
VCAP
Vref1 LVW THRESHOLD
Vref2 Reset THRESHOLD
IGNITION THRESHOLD
PROT
VS
7
SIG GND
3
EN 5V
1
STCAP
12
EN 8.25V
2
EN 16V
15
11
STAND-BY 5V
9
OUT 5V
10
OUT 8.25V
4
OUT 16V
14
13
6
IGN OUT
LVW/FAULT
RESET
IGN INP
5
D94AU213B
POW GND
8
BLOCK DIAGRAM
Multiwatt 15
ORDERING NUMBER: L4953K
1/8
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V
SDC
DC Operating Supply Voltage
14 to 28
V
V
STR
Transient Supply Voltage
50
V
I
O
Output Current
internally limited
T
op
Operating Temperature Range
40 to 85
C
T
stg
Storage Temperature
55 to 150
C
THERMAL DATA
Symbol
Parameter
Value
Unit
R
th j-case
Thermal Resistance Junction-case
2
C/W
1
2
3
4
5
6
7
9
10
11
8
STBY5V
OUT 8.25V
OUT 5V
PGND
VS
IGNOUT
IGNINP
OUT 16V
SGND
EN 8.25V
EN 5V
TAB CONNECTED TO PIN 8
13
14
15
12
EN 16V
RESET
LVW/FAULT
STCAP
D94AU054B
PIN CONNECTION (Top view)
L4953K
2/8
ELECTRICAL CHARACTERISTICS (V
S
= 14V, T
amb
= 25
C, unless otherwise specified.)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
V
S
Operating Supply Voltage
11
18
V
En
Output Noise Voltage
Any reg. supply,
f = 100Hz to 200KHz
200
400
V
T
shu d
Thermal Shutdown Junction
Temperature
155
C
5V STAND-BY OUTPUT VOLTAGE
V
5st-by
Stand-by Output Voltage
I
Load
= 5mA
4.75
5
5.25
V
V
line
Line Regulation
11V < V
S
< 16V
5
50
mV
V
load
Load Regulation
5mA < Iout < 100mA
45
150
mV
V
dropout
Dropout Voltage
I
out
= 100mA, V
S
= 5.5V
0.2
0.6
V
I
qst-by
Quiescent Current @ Stand-by
I
Load
= 5mA
0.3
0.5
mA
5V/1000mA SWITCHED OUTPUT VOLTAGE
V
out5
5V Output Voltage
no load
4.75
5
5.25
V
V
line
Line Regulation
7V < VS < 18V
5
50
mV
V
load
Load Regulation
5mA < Iout < 1A
12
50
mV
V
dropout
Dropout Voltage
I
out
= 1A, V
S
= 5.5V
1
1.5
V
I
q
Quiescent Current
75mA < I
out
< 1A
30
100
mA
SWon
Switch ON
3.5
V
SW off
Switch OFF
1.5
V
SW hyst
Switch Hysteresis
100
200
350
mV
R
in
Input Impedance
25
40
50
K
8.25V/500mA SWITCHED OUTPUT VOLTAGE
V
out
8.25V Output Voltage
no load
7.9
8.25
8.6
V
V
line
Line Regulation
11V < VS < 18V
5
50
mV
V
load
Load Regulation
Iout = 500mA
12
50
mV
V
dropout
Dropout Voltage
I
out
= 500mA, 5.5V < V
S
< 8.8V
0.4
0.9
V
I
q
Quiescent Current
I
out
= 500mA
10
25
mA
SVR
Supply Voltage Rejection
f = 100Hz
f = 10KHz
55
40
75
dB
SWon
Switch ON
3.5
V
SW off
Switch OFF
1.5
V
SW hyst
Switch Hysteresis
100
200
350
mV
R
in
Input Impedance
25
40
50
K
HIGH SIDE DRIVER WITH CLAMPED OUTPUT (16V)
V
out16
Max. Output Voltage
V
S
= 18V
15
16.2
V
I
O
Output Continuous Current
VS = 15V
1.5
A
V
dropout
Dropout Voltage
I
out
= 1A, 6V < V
S
< 15V
0.4
0.9
V
SWon
Switch ON
3.5
V
SW off
Switch OFF
1.5
V
SW hyst
Switch Hysteresis
100
200
350
mV
R
in
Input Impedance
25
40
50
K
L4953K
3/8
ELECTRICAL CHARACTERISTICS (continued)
LVW/FAULT (referred to V
S
)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
THON
LVW
LVW ON Threshold
8.55
9.00
9.45
V
THOFF
LVW
LVW OFF Threshold
8.75
9.20
9.65
V
(LVW-out 8.25)
LVW-V
out 8. 25
0.5
0.65
V
HYST
Threshold Hysteresis
50
200
350
mV
OUT
LW
LVW Output Voltage
1.5
V
I
leak
Leakage Current
50
A
RESET (referred to 5V st-by)
THON
reset
Reset ON Threshold
3.6
3.8
4
V
THOFF
reset
Reset OFF Threshold
3.8
4
4.2
V
HYST
reset
Reset Threshold Hysteresis
50
100
250
mV
OUT
reset
Reset Output Voltage
1.5
V
I
leak
Reset Leakage Current
50
A
IGNITION
TH
ign
Ign Comparator Positive
Threshold
5.5
6.5
7.5
V
HYST
ign
Ign Comparator Threshold
Hysteresis
100
300
500
mV
IGN
high
Ignition Comparator Output High
3.5
Vst-by
V
18.5K
D95AU402
2.1K
20K
10K
PIN 1: EN 5V
PIN 2: EN 8.25V
6.5K
D95AU403
PIN 4: OUT 16V
CIRCUIT CONFIGURATION - PIN EQUIVALENT CIRCUITS
L4953K
4/8
9.7K
D95AU404
36.3K
5.7V
5.3K
PIN 5: ING INP
7K
D95AU405
PIN 6: IGN OUT
9K
D95AU406
7.5V
7.5V
5.7V
780K
7.5V
28K
23K
33K
PIN 7: VS
4K
D95AU407
PIN 9: OUT 5V
3.8K
D95AU408
PIN 10: OUT 8.25V
123K
D95AU409
PIN 11: STAND-BY 5V
L4953K
5/8
D95AU410
7.5V
7.5V
7.5V
PIN 12: ST-CAP
D95AU411
30K
PIN 13: LVW / FAULT
D95AU412
70K
PIN 14: RESET
4K
D95AU413
7.5V
18.5K
20K
2.1K
10K
PIN 15: EN 16V
L4953K
6/8
Multiwatt15 V
DIM.
mm
inch
MIN.
TYP.
MAX.
MIN.
TYP.
MAX.
A
5
0.197
B
2.65
0.104
C
1.6
0.063
D
1
0.039
E
0.49
0.55
0.019
0.022
F
0.66
0.75
0.026
0.030
G
1.02
1.27
1.52
0.040
0.050
0.060
G1
17.53
17.78
18.03
0.690
0.700
0.710
H1
19.6
0.772
H2
20.2
0.795
L
21.9
22.2
22.5
0.862
0.874
0.886
L1
21.7
22.1
22.5
0.854
0.870
0.886
L2
17.65
18.1
0.695
0.713
L3
17.25
17.5
17.75
0.679
0.689
0.699
L4
10.3
10.7
10.9
0.406
0.421
0.429
L7
2.65
2.9
0.104
0.114
M
4.25
4.55
4.85
0.167
0.179
0.191
M1
4.63
5.08
5.53
0.182
0.200
0.218
S
1.9
2.6
0.075
0.102
S1
1.9
2.6
0.075
0.102
Dia1
3.65
3.85
0.144
0.152
OUTLINE AND
MECHANICAL DATA
L4953K
7/8
Information 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 parti es 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.
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2000 STMicroelectronics Printed in Italy All Rights Reserved
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L4953K
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