STMICROELECTRONICS L4946B

L4946B

QUAD VOLTAGE REGULATOR WITH INHIBIT AND RESET
4 OUTPUTS: 10V (125mA); 8.5V (250mA); 5V
(200mA); 5V (100mA)
10V AND 5V (100mA) OUTPUT ARE LOW
DROP
5V (100mA) ST-BY OUTPUT VOLTAGE
EARLY WARNING OUTPUT FOR SUPPLY
UNDERVOLTAGE (LVW)
THERMAL SHUTDOWN AND CURRENT
LIMITATION (FOLDBACK)
REVERSE BATTERY AND LOAD DUMP
PROTECTION
INHIBIT (ON/OFF) AND RESET FUNCTIONS
MULTIPOWER BCD TECHNOLOGY
Multiwatt 11
DESCRIPTION
The L4946B is a quad output low drop voltage
regulator. The four outputs are a low drop 10V at
125mA (VO1), a 8.5V at 250mA (VO2), a 5V at
200mA (VO3) and a low drop 5V st-by line at
100mA (VO4).
The IC includes a monitoring circuit to warn if a
low voltage or no voltage condition is occurring.
VO1,2,3 are off during st-by mode.
ORDERING NUMBER: L4946B
The STCAP pin allows the battery voltage to decay slowly giving the µP time to store data. This
IC is designed for supplying microcomputer controlled systems specially in automotive applications.
BLOCK DIAGRAM
L4946B
125mA
8.5V
250mA
200mA
June 2000
1/9
L4946
OPERATING CONDITION
Symbol
Parameter
Value
Unit
VS
Supply Voltage
-13.5 to 26.5
V
IL
Load Current IO1
IO2
IO3
IO4
300
400
600
100
mA
mA
mA
mA
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
VS
Supply Voltage
VI
Input Voltage (ON/OFF)
Value
Unit
-35 to 60
V
0 to 5
V
VO
Output Voltage (LVW, Reset)
0 to 5
V
Tstg
Storage Temperature Range
-65 to 150
°C
Tj
Junction Temperature Range
max 150
°C
60
V
Value
Unit
2
°C/W
Load Dump (5ms rise, 115ms decay)
PIN CONNECTION
APPLICATION CIRCUIT
0.1uF
L4946
THERMAL DATA
Symbol
Rth j-case
2/9
Parameter
Thermal Resistance Junction-case
max
L4946
ELECTRICAL CHARACTERISTICS (VS = 10.5 to 16V; I O1 = 6mA, IO2 = 8mA, IO3 = 4mA; IO4 = 0.4mA;
CO = 10µF max; Tamb = -40 to 85°C, unless otherwise specified.)
Symbol
Parameter
Test Condition
Max.
Unit
9.7
9.5
10
10
10.3
10.5
V
V
Output Voltage
∆VO1
Load Regulation
IO1 = 5 to 125mA
150
mV
Quiescent Current (∆IS)
VS = 14V; IO1 = 5mA;
VS =14V ; IO1 = 125mA;
10
18
mA
mA
Dropout Voltage
IO1 = 125mA
400
600
mV
mV
300
mA
VS-VO1
Tamb = 25°C;
all temps
Typ.
V O1
IQ
IO1 = 125mA;
11V < VS < 16V
Min.
T amb = 25°C
all temps
ΙL
V O1
V O1
V O1
Current Limit (Foldback) note1
VO1 = 0V
150
Max Bat.Trans.
R O = 100Ω
Ramp VS from 14 to 60V in 3-5ms
Hold V S at 60V for 10ms
Ramp VS from60 to 14V in 3-5ms;
Tamb = 25°C;
all temps
9.7
9.5
VS = -35V; t ≤ 1ms; RO = 100Ω
Check VO1,
Tamb = 25°C;
all temps
9.7
9.5
Rev. Voltage .
VS = -15V; R O = 100Ω
-0.4
Ripple rejection
(by design only)
fO = 120-10KHz; 1Vpp AC ; VS =14V
IO1 = 90mA; IO2 = 125mA;
IO3 = 75mA; IO4 = 50mA;
50
fO = 20-20KHz; 1Vpp AC ; VS =14V
IO1 = 90mA; IO2 = 125mA;
IO3 = 75mA; IO4 = 50mA;
50
Rev. Voltage Trans.
11
V
2
V
10
10
10.3
10.5
V
V
10
10
10.3
10.5
V
V
1
V
dB
dB
∆VO1
Line Regulation
∆VO1 across VS range
V O2
Output Voltage
∆VO2
Load Regulation
IO2 = 5 to 250mA
150
mV
Quiescent Current (∆IS)
VS = 14V; IO2 = 5mA;
VS = 14V; IO2 = 250mA;
10
35
mA
mA
Dropout Voltage
IO2 = 250mA
400
600
mV
mV
600
mA
9
V
2
V
∆IQ
VS-VO2
VS = 11V to 26V
IO2 = 250mA; Tamb = 25°C;
all temps
7.75
7.60
8
8
T amb = 25°C
all temps
ΙL
V O2
V O2
V O2
Current Limit (note1)
VO2 = 0V
Max Bat.Trans.
R O = 100Ω
Ramp VS from 14 to 60V in 3-5ms
Rev. Voltage Trans.
Rev. Voltage .
300
50
mV
8.25
8.40
V
V
Hold V S at 60V for 10ms
Ramp VS from60 to 14V in 3-5ms;
Tamb = 25°C;
all temps
7.85
7.60
8
8
8.15
8.20
V
V
VS = -35V; t < 1ms; RO = 100Ω
Check VO2, standard
Tamb = 25°C
all temps
7.85
7.80
8
8
8.15
8.20
V
V
VS = -15V; t = 30s; RO = 100Ω
-0.4
1
V
3/9
L4946
ELECTRICAL CHARACTERISTICS (continued)
Symbol
∆VO2
Parameter
Ripple rejection
Line Regulation
∆VO2 across VS range
Output Noise (design only)
V O3
Output Voltage
∆VO3
∆VO3
∆IQ
Line Regulation
Load Regulation
Quiescent Current (∆IS)
VS-VO3
IL
V O3
V O3
V O3
Dropout Voltage
Current Limit note 1
Max Bat.Trans.
Rev. Voltage Trans.
Rev. Voltage .
Ripple rejection
Output Noise
V O4
Output Voltage
∆VO4
∆VO4
∆IQ
Line Regulation
Load Regulation
Quiescent Current
VS-VO4
ΙL
4/9
Dropout Voltage
Current Limit (note 1)
Test Condition
fO = 120-10KHz; 1Vpp AC ; VS =14V
IO1 = 90mA; IO2 = 125mA;
IO3 = 75mA; IO4 = 50mA;
fO = 20-20KHz; 1Vpp AC ; VS =14V
IO1 = 90mA; IO2 = 125mA;
IO3 = 75mA; IO4 = 50mA;
VS = 10.5V to 26V
Check output for AC noise
using A weighted filter (2020KHz)
Check output for AC noise
using 100kHz LP (20-100KHz)
IO3 =200mA; Tamb = 25°C;
all temps
VS = 7V to 26V
IO3 = 5 to 200mA
VS = 14V; IO3 = 5mA;
VS = 14V; IO3 = 200mA;
IO3 = 200mA
Tamb = 25°C;
all temps
IO3 = 5mA
set VS = VO3+0.3V; Tamb = 25°C;
set VS = VO3+0.4V;all
VO3 = 0V
R O = 100Ω
Ramp VS from 14 to 60V in 3-5ms
Hold V S at 60V for 10ms
Ramp VS from60 to 14V in 3-5ms;
Tamb = 25°C;
all temps
VS = -35V; t < 1ms; RO = 100Ω
Check VO3, standard Tamb = 25°C;
all temps
VS = -15V; R O = 100Ω
fO = 120-10KHz; 1Vpp AC ; VS =14V
IO1 = 90mA; IO2 = 125mA;
IO3 = 75mA; IO4 = 50mA;
fO = 10KHz; 1Vpp AC ; VS =14V
Check Output for AC noise
using a 100KHz LP filter
Check Output for AC noise
using an A weighted filter (2020KHz)
IO4 = 100mA; Tamb = 25°C;
all temps
VS = 7V to 26V
IO4 = 0.5 to 100mA
VS = 14V; IO4 = 2mA;
VS = 14V; IO4 = 100mA;
IO4 = 100mA
T amb = 25°C
all temps
VO4 = 0V
Min.
50
Typ.
Max.
50
4.85
4.75
Unit
dB
dB
5
5
240
40
200
mV
µV
400
µV
5.15
5.25
40
100
10
25
V
V
mV
mV
mA
mA
400
600
mV
mV
400
500
480
mV
mV
mA
6
2
V
V
4.85
4.75
5
5
5.15
5.25
V
V
4.85
4.75
-0.4
50
5
5
5.15
5.25
1
V
V
V
dB
50
4.85
4.75
120
5
5
400
dB
µV
200
µV
5.15
5.25
40
80
500
20
V
V
mV
mV
µA
mA
400
600
300
mV
mV
mA
L4946
ELECTRICAL CHARACTERISTICS (continued)
Symbol
V O4
V O4
V O4
Parameter
Max Bat.Trans.
VI ON/OFF
VR
Min.
R O = 1000Ω
Ramp VS from 14 to 60V in 3-5ms
Max.
Unit
6
V
6
V
5
5
5.15
5.25
V
V
5
5
5.15
5.25
V
V
4.85
4.75
VS = -35V; t < 1ms; RO = 1000Ω
Check VO4, standard Tamb = 25°C;
all temps
4.85
4.75
Rev. Voltage .
VS = -15V; R O = 1000Ω
-0.4
Ripple rejection
fO = 1KHz; 1Vpp AC ; VS =14V
IO1 = 90mA; IO2 = 125mA;
IO3 = 75mA; IO4 = 50mA;
50
dB
fO = 10KHz; 1Vpp AC ; VS =14V
IO1 = 90mA; IO2 = 125mA;
IO3 = 75mA; IO4 = 50mA;
50
dB
Rev. Voltage Trans.
Input Current
1
V
Check output for AC noise
using A weighted filter (2020KHz)
200
µV
Check output for AC noise
using 100kHz LP (20-100KHz)
400
µV
1
µA
µA
VS = 14V; VIH = >2V;
VS = 14V; VIL = <0.8V;
-10
Input Threshold
VS = 14V V IL
VS = 14V VIH
0
2
0.8
5
V
V
Reset Output Voltage Set
VS so that VO4 < 4.5V;
R O = 200KΩ to V04; VIL = ”0”
0
0.4
V
VS so that VO4 -0.15V;
R O = 200KΩ to V04; VIH = ”1”
2.75
5
V
100
µs
8.2
V
Reset and LVW Output Rise
Time
LVW Output Threshold
Ramp VS down until LVW
switches from”1” to a ”0”
7.0
150
µs
STCAP <7V;R O = 200KΩ to VO4;
VIL = ”0”
0
0.4
V
STCAP >8V;R O = 200KΩ to VO4;
VIH = ”1”
2.75
5
V
LVW and LVW Output Fall Time
LVW Output Voltage
Iq
Typ.
Hold V S at 60V for 10ms
Ramp VS from60 to 14V in 3-5ms;
Tamb = 25°C;
all temps
Output Noise (design only)
ON/OFF
Test Condition
Reset Output Stability
VS is set such that 1 < V04 <
4V; IOUT4 = 2mA; VON/OFF = 0
meas reset variation
50
mV
St-By Quiescent Current (∆IS)
VON/OFF = 0V; IO 4 = 100mA;
VS = 14V; IO 1,2,3 = 0mA
20
mA
VON/OFF = 0V; IO 4 = 2mA;
Vbat = 14V; IO1,2,3 = 0mA
500
µA
Maximum Quiescent Current
(∆IS)
VS = 14V; IO1 = 175mA;
IO2 = 275mA; IO3 = 200mA;
IO4 = 100mA; VO = 5V
100
mA
STCAP Output Voltage
VS = 24V;
VS = 60V. 1ms
17
18
V
V
15
Note 1:
The L4946 has ”Foldback” on its outputs during current limiting. As the output loading is increasing the current supplied by the L4946 increases
until a threshold is reached. When the current limiting threshold is reached, the L4946 output current will start to accrease as the loading is
continuoing to increase. The point where the output current stort to decrease is the maximum output current.
5/9
L4946
FUNCTIONAL DESCRIPTION
The L4946 includes a monitoring circuit to warn
the microprocessor if a low voltage or no voltage
condition is occurring. Between 7V and 8V on the
STCAP pin, 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 V04 drops 0.15V below it’s typical reading.
A reset will occur between a minimum of 4.5 and
a maximum of 5V on V04. The reset output will go
low when V04 drops 0.15 below it’s typical value.
A reset will occur between a minimum of 4.5V
and a maximum of 5V on V04. When the V04
drops between 4.5 and 5V the RESET output
goes low. It is very important that the RESET output doesn’t go above 0.75V until the V04 output
has gone back above 4.75V (typical). The microprocessor looks for a rising edge. So, any spike
will tell the microprocessor to start operating.
Once the STCAP line passes 7.5V (typical), the
LVW output will also return to high state.
TIMING DIAGRAM
7.5
7.5
5.0
150µs
100µs
5.0
150µs
Graphs of the Output Curves for VO1,2,3 and 4
6/9
100µs
L4946
The STCAP pin acts like a delay circuit. Due to
the large capacitor (470µF), the STCAP pin allows
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 st-by output from
dropping below the RESET and LVW trip points
The four outputs are expected to follow the battery voltage down to 7V. At 7V typical the LVW
tells the microprocessor to stop operation and
save operating data Below 7V the outputs are expected to stay alive and ready for a return of battery.
The L4946 has a st-by mode to keep the microprocessor and memories allive during an ignition
off conditions. The ON/OFF input pin in controlled
by the microprocessor. An high on the ON/OFF
pin places the part in normal mode. A low on the
ON/OFF pin places the part in st-by mode.V01,
V02, V03 will be off during st-by mode.
Graphs of the Output Curves for VO1,2,3 and 4 (Cont.)
Notes and Information
The following information is for clarification, not for specification definition.
Please use the information in this way.
7/9
L4946
DIM.
mm
MIN.
A
MAX.
5
B
C
2.65
1.6
D
E
0.49
F
G
G1
0.88
1.45
16.75
H1
H2
19.6
L
L1
21.9
21.7
L2
L3
17.4
17.25
L4
L7
10.3
2.65
M
M1
4.25
4.73
S
S1
Dia1
8/9
TYP.
inch
MIN.
MAX.
0.197
OUTLINE AND
MECHANICAL DATA
0.104
0.063
1
1.7
17
TYP.
0.039
0.55
0.019
0.95
1.95
17.25
0.035
0.057
0.659
0.022
0.067
0.669
0.037
0.077
0.679
0.874
0.87
0.886
0.886
0.689
0.713
0.699
0.772
20.2
0.795
22.2
22.1
22.5
22.5
0.862
0.854
17.5
18.1
17.75
0.685
0.679
10.7
10.9
2.9
0.406
0.104
0.421
0.429
0.114
4.55
5.08
4.85
5.43
0.167
0.186
0.179
0.200
0.191
0.214
1.9
1.9
2.6
2.6
0.075
0.075
0.102
0.102
3.65
3.85
0.144
0.152
Multiwatt11 V
L4946
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 parties 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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