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Электронный компонент: L4954

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L4954
QUAD MULTIFUNCTION
VOLTAGE REGULATOR FOR CAR RADIO
4 REGULATORS
10V (40mA); 8.5V (175mA); 5V (650mA);
5V (100mA) STANDBY
10V AND 5V STAND BY REGULATORS ARE
LOW DROPOUT OUTPUTS
3 HIGH SIDE DRIVERS:
2A (HSD1), 0.3A (HSD2 & HSD3)
NO EXTERNAL CHARGE PUMP CAPACI-
TORS ARE REQUIRED
STAND BY MODE CONTROLLED BY 3 IN-
PUT PINS:
EN1 FOR REG1, REG2, REG3 AND HSD1,
EN2 FOR HSD2, AND EN3 FOR HSD3
INDIVIDUAL THERMAL SHUTDOWN
LOGIC OUTPUTS FOR SUPPLY UNDER-
VOLTAGE: (LVWARN, RESET)
INDEPENDENT CURRENT LIMITING
OVERVOLTAGE SHUTDOWN
SHORT CIRCUIT PROTECTION
LOAD DUMP PROTECTION AND OVERVOL-
TAGE SHUTDOWN
DESCRIPTION
L4954 is a quad output voltage regulator and a
three output high side driver.
The IC includes monitoring circuitry to warn the
microprocessor of a low voltage condition:
the LVWarn, output, sensing the slow dropping of
STCAP pins voltage, gives the microprocessor
time to store data.
A RESET output is generated at REG4's decay.
External protection must be provided for reverse
battery protection.
June 2000
REG1
10V, 40mA
VOLTAGE
REFERENCE
REG2
8.5V, 175mA
REG3
5V, 650mA
REG4
5V, 100mA
VS
RESET
LVWarn
EN1
EN2
10V-REG1
8.5V-REG2
5V-REG3
5V-REG4-STBY
EN3
D95AU346
GND
STCAP
CURRENT
LIMIT
RESET
LVW
OUTPUT
CONTROL
THERMAL
SHUTDOWN
OVERVOLTAGE
PROTECTION
HSD1
2.0A
HSD2
0.3A
HSD3
0.3A
HSD1
HSD2
HSD3
BLOCK DIAGRAM
ORDERING NUMBER: L4954
Multiwatt15
1/7
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V
S
DC Operating Supply Voltage
-0.6 to 26.5
V
V
S
Transient Supply Overvoltages, rise time = 10ms
delay time = 115ms
34
V
V
S,ovs
Overvoltage Shutdown
27
V
V
in
Input Voltages (EN1, EN2, EN3)
-0.6 to 6.0
V
V
out
Output Voltages (LVWarn, RESET)
-0.6 to 6.0
V
T
op
Operating Temperature Range
-40 to 85
C
T
stg
Storage Temperature Range
-40 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
EN2
EN1
RESET
GND
LVWarn
5V REG4-STBY
ST CAP
HSD3-0.3A
HSD2-0.3A
V
S
HSD1-2A
TAB CONNECTED TO PIN 8
13
14
15
12
10V REG1
8.5V REG2
5V REG3
EN3
D95AU347
PIN CONNECTION
+V
S
1000
F
0.1
F
2
10
11
EN1
EN2
12
EN3
1
HSD1
3
HSD2
4
HSD3
5
STCAP
0.1
F
15
8
0.1
F
47K
47K
7
9
6
10
F(*)
10
F(*)
10
F(*)
14
13
10
F(*)
10V-REG1
8.5V-REG2
5V-REG3
5V-REG4
-STBY
LVWarn
RESET
D95AU348C
L4954
470
F
(*)ESR of output capacitors should be between 0.2
to 5.0
APPLICATION CIRCUIT
L4954
2/7
ELECTRICAL CHARACTERISTICS (Refer to the application circuit, V
S
= 14.4V; T
amb
= 25
C;
I
OUT10
= 5mA; I
OUT8.5
= 5mA; I
OUT5
= 5mA; I
OUT5 ST-BY
= 0.5mA; R
HSD1
= 16
, R
HSD2,3
= 107
,
unless otherwise specified.)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
V
S
Operating Supply Voltage
11
16
V
Iq
Maximum Quiescent Current
I
OUT10
= 40mA; I
OUT8.5
= 175mA;
I
OUT5
= 650mA;
I
OUT5 ST-BY
= 100mA; R
HSD1
= 8
;
R
HSD2,3
= 53
10
mA
I
q,ST-BY
Standby Quiescent Current
EN1, EN2, EN3 = 0
I
OUT5, ST-BY
= 50mA;
420
A
EN1, EN2, EN3 = 0
I
OUT5, ST-BY
= 2mA;
300
A
V
ENL
EN1, EN2, EN3 Input Low
Voltage
0
0.8
V
V
ENH
EN1, EN2, EN3 Input High
Voltage (Outputs Active)
2
5
V
10V / 40mA REG 1 OUTPUT
V
OUT10
Output Voltage
I
OUT10
= 40mA
10
V
V
line
Line Regulation
V
S
= 11 to 26V
2
mV
V
load
Load Regulation
I
out10
= 5 to 40mA
2
mV
V
DROPOUT
Dropout Voltage
V
S
= V
OUT10
+ 0.1V
I
out10
= 5mA
100
200
mV
V
S
= V
OUT10
+ 0.5V
I
out10
= 40mA
500
600
mV
I
q1
Reg 1Quiescent Current
I
OUT10
= 5mA
7
mA
I
OUT10
= 40mA
7
mA
I
lim1
Current Limit
100
mA
SVR
1
Reg 1Supply Voltage Rejection
f = 0.12 to 10KHz;
I
OUT10
= 25mA; V
RIP
= 1V
pp
55
dB
8.5V / 175mA REG 2 OUTPUT
V
OUT8.5
Output Voltage
I
OUT8.5
= 175mA
8.5
V
V
line
Line Regulation
V
S
= 11 to 26V
2
mV
V
load
Load Regulation
I
out8.5
= 5 to 175mA
10
mV
V
DROPOUT
Dropout Voltage
V
S
= V
OUT8.5
+ 0.3V
I
out8.5
= 5mA
300
400
mV
V
S
= V
OUT8.5
+ 1V
I
out8.5
= 175mA
1
1.1
V
I
q2
Reg 2 Quiescent Current
I
OUT8.5
= 5mA
7
mA
I
OUT8.5
= 175mA
7
mA
I
lim2
Current Limit
300
mA
SVR
2
Reg 1Supply Voltage Rejection
f = 0.12 to 10KHz;
I
OUT8.5
= 100mA; V
RIP
= 1V
pp
55
dB
L4954
3/7
ELECTRICAL CHARACTERISTICS (Continued)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
5V / 650mA REG 3 OUTPUT
V
OUT5
Output Voltage
I
OUT5
= 650mA
5
V
V
line
Line Regulation
V
S
= 7 to 26V
2
mV
V
load
Load Regulation
I
out5
= 5 to 650mA
9
mV
V
DROPOUT
Dropout Voltage
V
S
= V
OUT5
+ 0.3V
I
out5
= 5mA
300
400
mV
V
S
= V
OUT5
+ 1V
I
out5
= 650mA
1
1.1
V
I
q3
Reg 3 Quiescent Current
I
OUT5
= 5mA
7
mA
I
OUT5
= 650mA
7
mA
I
lim3
Current Limit
1.25
A
SVR
3
Reg 3 Supply Voltage Rejection
f = 0.12 to 10KHz;
I
OUT5
= 325mA; V
RIP
= 1V
pp
55
dB
5V / 100mA STAND-BY REG 4 OUTPUT
V
OUT5STBY
Output Voltage
I
OUT5STBY
= 100mA
5
V
V
line
Line Regulation
V
S
= 7 to 26V
0.8
mV
V
load
Load Regulation
I
out
= 0.5 to 100mA
3.5
mV
V
DROPOUT
Dropout Voltage
V
S
= V
REG5STBY
+ 0.1V
I
out5STBY
= 5mA
100
200
mV
V
S
= V
REG5STBY
+ 0.5V
I
out5STBY
= 100mA
500
600
mV
I
q4
Reg 4 Quiescent Current
I
OUT5STBY
= 2mA
0.25
mA
I
OUT5STBY
= 100mA
0.35
mA
I
lim4
Current Limit
190
mA
SVR
4
Reg 4 Supply Voltage Rejection
f = 0.12 to 10KHz
I
out5STBY
= 50mA; V
RIP
= 1V
pp
55
dB
2A HSD1
V
sat,peak
Maximum Output Current
Saturation Voltage
R
HSD1
= 8
600
mV
I
q
Quiescent Current
9
mA
I
lim
Current Limit
R
HSD1
= 0.5
3.5
A
I
leak1
Output Leakage Current
All driver outputs are off
20
A
0.3A HSD2 & HSD3
V
sat
Maximum Output Current
Saturation Voltage
R
HSD2,3
= 53
150
mV
I
q
Quiescent Current
1.5
mA
I
lim
Current Limit
R
HSD2.3
= 0.5
500
mA
I
leak2,3
Output Leakage Current
All driver outputs are off
10
A
L4954
4/7
FUNCTIONAL DESCRIPTION
The L4954 includes a monitoring circuit to warn
the microprocessor if a low voltage or no voltage
condition is occurring.
When the voltage on the STCAP pin drops below
7.5V (typ), the LVW output will go low. This tells
the microprocessor to stop executing code and
save vital information. The reset output will go low
when REG4 (5V-STBY) drops below (V
REG4
-
250mV) or 4.75V is minimum value. The RESET
output doesn't go above 0.4V until REG4 has
gone back above 4.75V (min).
Any spike will tell the microprocessor to start op-
erating. Once the STCAP line passes 7.5V (typ),
the LVWarn output will also return to high state.
The STCAP pin acts like a delay circuit. Due to
the large capacitor (470
F), the STCAP pin al-
lows the battery voltage to decay slowly giving the
microprocessor time to store data.
Also, during short low voltage or negative voltage
conditions, the STCAP pin protects the 5V STBY
output from dropping below the RESET and LVW
trip points. The four outputs are expected to fol-
low the battery voltage down
to 11V for REG1,
9V for REG2, 6V for REG3 and REG4.
The L4954 has a STBY mode to keep the micro-
processor and memories alive during an ignition
off conditions. The EN1 input pin is controlled by
the microprocessor. A high on the EN1 input turns
on REG1, REG2, REG3, and HSD1. A Low on
EN1 places the part in stand-by mode with REG4
on. The High side driver outputs HSD2 and HSD3
are controlled by EN2 and EN3 respectively: a
Low on the control input turns the corresponding
high side driver off.
ELECTRICAL CHARACTERISTICS (Continued)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
LVWARN OUTPUT
TH
LVW
LVW Threshold on STCAP
7.5
V
V
LVW
LVW Output Voltage
STCAP <7.5V; V
IL
= "0"
0
0.4
V
STCAP >7.5V V
IH
= "1"
2.75
5
V
t
rise
LVW Output Rise Time
C
LVW
= 0.1
F
3.9
ms
t
fall
LVW Output Fall Time
C
LVW
= 0.1
F
12.6
s
RESET OUTPUT
TH
RES
Reset Threshold on Reg 4
4.5
V
V
RES
Reset Output Voltage
Set V
S
so that V
OUT5STBY
<4.5V;
V
IL
= "0"
0
0.4
V
Set V
S
so that V
OUT5STBY
is not
less than normal REG4 output
voltage; V
IH
= "1"
2.75
5
V
t
rise
Reset Output Rise Time
C
RESET
= 0.1
F
4.5
ms
t
fall
Reset Output Fall Time
C
RESET
= 0.1
F
37
s
STCAP
(V)
0
7.5
7.5
TIME
4.75
4.75
REG4
(V)
5
0
5
0.4
5
LVWarn
(V)
RESET
(V)
TIME
TIME
TIME
D95AU349A
TIMING DIAGRAM
L4954
5/7
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
L4954
6/7
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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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L4954
7/7