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L5957

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
List of figures L5957
4/16 Doc ID 14442 Rev 3
List of figures
Figure 1. Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 2. Pins connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 3. Typical application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 4. Maximum ESR for stability valid for all the regulators outputs . . . . . . . . . . . . . . . . . . . . . . 10
Figure 5. Timing diagram of regulators and power switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 6. Backup and reset diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 7. Hold and thermal protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 8. Ignition buffer diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 9. Protection of the power switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 10. Short circuit diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 11. PowerSO20 (slug up) mechanical data and package dimensions . . . . . . . . . . . . . . . . . . . 13
Figure 12. Multiwatt15 (vertical) mechanical data and package dimensions. . . . . . . . . . . . . . . . . . . . 14
L5957 Block and pins connection diagrams
Doc ID 14442 Rev 3 5/16
1 Block and pins connection diagrams
Figure 1. Block diagram
Figure 2. Pins connection
POWER
SWITCH
IGNITION
BUFFER
THERMAL
PROTECTION
RESET
BUFFER
DUMP LOAD
PROTECTION
REG1
REG2
REG3
REG4
VINI (MAIN)
EN_SW
BU
VIN2
IGN
IN
RES
HOLD
REG 4(3.3V)
REG 3(5V)
REG 2(PERM)(5V)
REG 1(8.5V)
SW
IGN
OUT
D02AU1342/L5957
CRES
ENREG3(5V)
ENREG1-4(8.5V, 3.3V)
GND
HOLD
EN_SW
ENREG3(5V)
ENREG1-4(8.5V, 3.3V)
RES
CRES
IGNOUT
IGNINREG3(5V)
N.C.
REG1(8.5V)
N.C.
SW
VIN1
BU
REG2(5V)
HEATSINK
10
8
9
7
6
5
4
3
2
13
14
15
16
17
19
18
20
12
1
11
REG4(3.3V)VIN2
D02AU1343 /L5957
PowerSO
1
2
3
4
5
6
7
9
10
11
8
BU
REG2
VIN1
GND
HOLD
EN SW
ENREG1, 4
ENREG3
CRES
RES
REG4
13
14
15
12
VIN2
REG3
REG1
SWITCH
D03AU1513/L5957
Multiwatt
Electrical specifications L5957
6/16 Doc ID 14442 Rev 3
2 Electrical specifications
2.1 Absolute maximum ratings
2.2 Thermal data
2.3 Electrical characteristics
V
S
= 14.4 V; T
amb
= 25 °C; unless otherwise specified.
Table 2. Absolute maximum ratings
Symbol Parameter Value Unit
V
SDC
DC operating supply voltage 30 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
T
j
Junction temperature -55 to 150 °C
P
d
Power dissipation T
case
= 85 °C 43 W
Table 3. Thermal data
Symbol Parameter PowerSO Multiwatt Unit
R
th j-case
Thermal resistance junction-to-case Max. 1.5 1.8 °C/W
Table 4. Electrical characteristics
Symbol Parameter Test condition Min. Typ. Max. Unit
Input supplies
V
in1
Input supply voltage 1 Operating 9 - 18 V
V
in2
Input supply voltage 2 Operating 6 - 18 V
I
q
Total quiescent current
Standby (-20 °C to 85 °C)
IGN
IN
= 5 V
--70A
REGx = 5 V, REGsw = 5 V,
IGN
IN
= 5 V
-5-mA
Standby (-20 °C to 85 °C)
IGN
IN
= 5 V, V
CC
= 18 V
-100- µA
Load Dump
V
in1
Battery over voltage
V
in1
18 20 22 V
Load Dump
V
in2
V
in2
18 20 22 V
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

L5957

Mfr. #:
Buy L5957
Manufacturer:
STMicroelectronics
Description:
LDO Voltage Regulators Multifunction Voltage Regulator
Lifecycle:
New from this manufacturer.
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