ST L5956 User Manual

L5956

Multifunction voltage regulator for car radio

Features

■Four outputs:

–8.5 V @ 500 mA

–5 V @ 300 mA permanent

–5 V @ 800 mA

–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

Table 1. Device summary

	'!0'03
PowerSO20 (slug-up)	Multiwatt 15 (vertical)

Description

The L5956 contains a triple voltage regulator and a power switch.

The IC includes a monitoring circuit for detection.

The IC features a very low quiescent under standby.

Order code	Package	Packing
L5956	Multiwatt 15 (vertical)	Tube
L5956PD	PowerSO20	Tube
L5956PDTR	PowerSO20	Tape and reel

June 2011

Doc ID 13852 Rev 3

1/17

www.st.com

Contents	L5956

Contents

1	Block diagram and pins description . . . . . . . . . . . . . . . . . . . . . . . . . . .		. 5
	1.1	Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	5
	1.2	Pins description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	5
2	Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		6
	2.1	Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6
	2.2	Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6
	2.3	Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6
3	Timing diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		11
4	Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		14
5	Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		16

2/17	Doc ID 13852 Rev 3

L5956	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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Doc ID 13852 Rev 3

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List of figures	L5956

List of figures

Figure 1. Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Figure 2. Pins connection (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Figure 3. Typical application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Figure 4. Maximum ESR for stability valid for all the regulators outputs . . . . . . . . . . . . . . . . . . . . . . 10 Figure 5. Timing diagram of regulators and power switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Figure 6. Backup and reset diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Figure 7. Hold and thermal protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Figure 8. Ignition buffer diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Figure 9. Protection of the power switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Figure 10. Short circuit diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Figure 11. PowerSO20 (slug-up) mechanical data and package dimensions . . . . . . . . . . . . . . . . . . . 14 Figure 12. Multiwatt 15 (vertical) mechanical data and package dimensions . . . . . . . . . . . . . . . . . . . 15

4/17	Doc ID 13852 Rev 3

L5956	Block diagram and pins description

1 Block diagram and pins description

1.1Block diagram

Figure 1. Block diagram

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1.2Pins description

Figure 2. Pins connection (top view)

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'!0'03

Doc ID 13852 Rev 3

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Electrical specifications	L5956

2 Electrical specifications

2.1Absolute maximum ratings

Table 2.	Absolute maximum ratings
Symbol	Parameter	Value	Unit
VSDC	DC operating supply voltage	30	V
VSTR	Transient supply voltage	50	V
IO	Output current	internally limited
Top	Operating temperature range	-40 to 85	°C
Tstg	Storage temperature	-55 to 150	°C
Tj	Junction temperature	-55 to 150	°C
Pd	Power dissipation at Tcase = 85 °C	43	W

2.2Thermal data

Table 3.	Thermal data
Symbol	Parameter		PowerSO	Multiwatt	Unit
Rth j-case	Thermal resistance junction-to-case	Max.	1.5	1.8	°C/W

2.3Electrical characteristics

VS = 14.4 V; Tamb = 25 °C; unless otherwise specified.

Table 4.	Electrical characteristics
Symbol		Parameter	Test condition	Min.	Typ.	Max.	Unit
INPUT SUPPLIES
Vin1		Input supply voltage 1	Operating	9	-	18	V
Vin2		Input supply voltage 2	Operating	6	-	18	V
V		Input supply voltage 1	Reverse polarity		Non operating(1)
in1
V		Input supply voltage 2	Reverse polarity		Non operating (1)
in2
			Standby (-20° C to 85 °C)	-	-	60	µA
			IGNIN = 5 V
Iq		Total quiescent current	REGx = 5 V, REGsw = 5 V,	-	5	-	mA
			IGNIN = 5 V
			Standby (-20 °C to 85 °C)	-	100	170	µA
			IGNIN = 5 V, VCC = 18 V

6/17	Doc ID 13852 Rev 3