ST L5957 User Manual
Features
■ Four outputs:
– 8.5 V @ 500 mA
– 5 V @ 300 mA Permanent
–5 V @ 800mA
– 3.3 V @ 800 mA
■ 2 A high side driver
■ Reset function
■ Ignition comparator
■ Load dump protection
■ Thermal shutdown
■ Overcurrent limitation
■ All pins ESD protected
L5957
Multifunction voltage regulator for car radio
Multiwatt15 (Vertical)
PowerSO20 (Slug up)
Description
The L5957 contains a triple voltage regulator and
a power switch.
Table 1. Device summary
Order code Package Packing
L5957PD PowerSO20 (slug up) Tube
L5957PDTR PowerSO20 (slug up) Tape and reel
L5957 Multiwatt15 (Vertical) Tube
The IC includes a monitoring circuit for detection.
The IC features a very low quiescent current in
standby.
January 2010 Doc ID 14442 Rev 2 1/16
www.st.com
1
Contents L5957
Contents
1 Block and pins connection diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2/16 Doc ID 14442 Rev 2
L5957 List of tables
List of tables
Table 1. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Table 2. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Table 3. Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Table 4. Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Table 5. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Doc ID 14442 Rev 2 3/16
List of figures L5957
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
4/16 Doc ID 14442 Rev 2
L5957 Block and pins connection diagrams
1 Block and pins connection diagrams
Figure 1. Block diagram
VINI (MAIN)
EN_SW
BU
VIN2
ENREG3(5V)
ENREG1-4(8.5V, 3.3V)
IGN
IN
Figure 2. Pins connection
THERMAL
PROTECTION
POWER
SWITCH
REG1
REG2
REG3
REG4
DUMP LOAD
PROTECTION
IGNITION
BUFFER
IGN
OUT
RESET
BUFFER
D02AU1342/L5957
SW
REG 1(8.5V)
REG 2(PERM)(5V)
REG 3(5V)
REG 4(3.3V)
HOLD
RES
CRES
N.C.
REG1(8.5V)
N.C.
VIN1
REG2(5V)
HEATSINK
SW
BU
20
19
18
17
16
15
14
13
12
11
PowerSO
D02AU1343 /L5957
Multiwatt
1
REG4(3.3V)VIN2
2
IGNINREG3(5V)
3
IGNOUT
RES
4
CRES
5
ENREG1-4(8.5V, 3.3V)
6
ENREG3(5V)
7
EN_SW
8
9
HOLD
GND
10
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
VIN2
REG3
REG1
SWITCH
BU
REG2
VIN1
GND
HOLD
EN SW
ENREG1, 4
ENREG3
CRES
RES
REG4
D03AU1513/L5957
Doc ID 14442 Rev 2 5/16
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