ST L9758 User Manual

L9758

Multiple supply for engine control

Features

■Buck converter pre-regulated supply rated for a minimum of 2 A (RMS)

■Optional Boost converter for low battery conditions

■5 V, 2% @ 1 A, VDD5 low dropout (LDO) regulator

■Programmable 3.3 V or 2.6 V, 2% @ 1 A, VDDL LDO regulator with external pass transistor

■Programmable microcontroller core voltage

LDO regulator, VCORE 2% @ 1 A with external voltage divider and pass transistor

■Programmable 1 V or 1.5 V, 10% @ 10 mA, standby memory regulator (VKAM)

■Programmable 3.3 V or 2.6 V, 10% @ 10 mA alternate standby regulator (VSTBY)

■Four 5 V ± 7 mV @ 50 mA protected tracking regulators, one of them with selectable external voltage reference.

■Independent reset signals, RST5 and RSTL for the VDD5, VDDL supplies.

■Independent standby voltage monitor STANDBY_OK

■Two power supply enable signals for different voltage level signals

PowerSO-36

■Battery voltage thresholding - IGN

■Logic level thresholding - PSU_EN

Description

The L9758 is a multiple output voltage regulator utilizing linear, switchmode (buck and boost) and tracking regulators to support high end automotive microcontrollers used in powertrain applications.

The L9758 provides two standby power regulators as well as controllable LDO regulators.

The L9758 has power on reset functionality and controlled slew rate of the VDD5, VDDL and VCORE.

Table 1.	Device summary
Order code		Temperature range	Package	Packing
	L9758	-40 °C to +125 °C	PowerSO-36	Tube

November 2010

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Contents	L9758

Contents

1	Pins configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		. 6
2	Functional block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		. 9
3	Operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		10
	3.1	Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	10
	3.2	Operating ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	11
	3.3	Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	11
4	Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		12
	4.1	General DC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	12
	4.2	BUCK pre-regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	13
	4.3	Boost pre-regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	14
	4.4	VDD5 linear regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	15
	4.5	VDDL linear regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	15
	4.6	VCORE linear regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	16
	4.7	VKAM linear regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	17
	4.8	VSTBY linear regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	17
	4.9	VSA, VSB, VSC, VSD tracking linear regulator . . . . . . . . . . . . . . . . . . . .	18
	4.10	RST5 and RSTL reset signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	18
	4.11	IGN and PSU_EN inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	19
	4.12	STBY_OK signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	20
5	Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		21

5.1 General function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 5.2 Switching pre-regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 5.3 VDD5, VDDL and VCORE linear regulators . . . . . . . . . . . . . . . . . . . . . . . 21 5.4 Tracking regulators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 5.5 VKAM and VSTBY linear regulators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 5.6 RESET monitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 5.7 Thermal protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 5.8 Reference current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

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L9758 Contents

6	Operating modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		24
	6.1	Standby mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	24
	6.2	Run mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	24

6.2.1 Entry into run mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

6.3 Power down . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 6.4 Low voltage operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 6.5 High voltage operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

7	Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	27
8	Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	28

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List of tables	L9758

List of tables

Table 1. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Table 2. Pins description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Table 3. Control pins description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Table 4. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Table 5. Operating ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Table 6. Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Table 7. General DC characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Table 8. BUCK pre-regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Table 9. Boost pre-regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Table 10. VDD5 linear regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Table 11. VDDL linear regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Table 12. VCORE linear regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Table 13. VKAM linear regulator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Table 14. VSTBY linear regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Table 15. VSA, VSB, VSC, VSD tracking linear regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Table 16. RST5 reset signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Table 17. RSTL reset signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Table 18. IGN and PSU_EN inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Table 19. STBY_OK signal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Table 20. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

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L9758	List of figures

List of figures

Figure 1. Pins connection (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Figure 2. Functional block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Figure 3. Current reference generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Figure 4. Power up/down sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Figure 5. PowerSO-36 mechanical data and package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . 27

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Pins configuration	L9758

1 Pins configuration

Figure 1. Pins connection (top view)

GND		1	36		SW
VBAT		2	35		FDBK
VBAT_SW		3	34		VB
BOOST		4	33		VDD5
RES_S		5	32		VDDL_DRV
GND_S		6	31		VDDL_FDBK
VBAT_S		7	30		VCORE_FDBK
IGN		8	29		VCORE_DRV
IGN_ON		9	28		VPROG3
PSU_EN		10	27		CORE_DIS
VSD		11	26		VPROG1
VSC		12	25		VPROG2
VSB		13	24		VKAM
VSA		14	23		VSTBY
TRACK_REF		15	22		STBY_OK
REF_SEL		16	21		RST5
VS_DIS		17	20		RSTL
REXT		18	19		RST_TIM

Table 2.	Pins description
Pin #	Name	Description
1	GND	Power ground
2	VBAT	Battery power source
3	VBAT_SW	Switched battery power source
4	BOOST	External boost transistor predriver output
5	RES_S	Boost (+) current comparator input
6	GND_S	Boost (-) current comparator input
7	VBAT_S	Battery feedback for boost controller
8	IGN	Ignition switch
9	IGN_ON	Ignition state
10	PSU_EN	Power supply enable
11	VSD	Tracking regulator D
12	VSC	Tracking regulator C
13	VSB	Tracking regulator B
14	VSA	Tracking regulator A
15	TRACK_REF	Tracking A voltage reference

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L9758							Pins configuration
	Table 2.	Pins description (continued)
	Pin #		Name				Description
	16		REF_SEL				Tracking A voltage reference selection
	17		VS_DIS				Sensor supply disable
	18		REXT				External current reference resistance
	19		RST_TIM				Reset timer adjustment
	20			RSTL			VDDL regulator reset output
	21			RST5			VDD5 regulator reset output
	22		STBY_OK				Standby regulator monitor
	23		VSTBY				Standby regulator output
	24		VKAM				Standby memory regulator output
	25		VPROG2				Standby regulator voltage selection (VSTBY)
	26		VPROG1				Standby memory regulator voltage selection (VKAM)
	27		CORE_DIS				VDDL and VCORE disable
	28		VPROG3				VDDL voltage selection
	29		VCORE_DRV				VCORE external pass transistor predriver output
	30		VCORE_FDBK				VCORE feedback
	31		VDDL_FDBK				VDDL feedback
	32		VDDL_DRV				VDDL external pass transistor predriver output
	33		VDD5				VDD5 linear regulator output
	34			VB			Switching preregulator output
	35		FDBK				Switching voltage feedback
	36			SW			Buck regulator switch output
	Table 3.	Control pins description
	Pin name			Logic			Description	Type of
				level				I/O
	IGN			Low		Enter in Stand-by Mode if also PSU_EN is low		Pull
				High		Enter in Run Mode		down
	IGN_ON			Low		IGN is high		Open
				High		IGN is low		drain
	PSU_EN			Low		Enter in Stand-by Mode if also IGN is low		Pull
				High		Enter in Run Mode		down
	VS_DIS			Low		Enable VSB, VSC, VSD tracking regulators		Pull
				High		Disable VSB, VSC, VSD tracking regulators		down
				Low		Voltage reference for VSA tracking regulator is VDD5		Pull
	Ref_Sel
						Voltage reference for VSA tracking regulator is
				High				down
						VTRACK_REF

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Pins configuration					L9758
	Table 3.	Control pins description (continued)
	Pin name		Logic	Description	Type of
			level		I/O
	RSTL		Low	VDDL output regulator out of range (under voltage)	Open
			High	VDDL output regulator fully operational	collector
	RST5		Low	VDD5 output regulator out of range (under voltage)	Open
			High	VDD5 output regulator fully operational	collector
	VPROG1		Low	VKAM regulator output programmed to 1V	Pull up
			High	VKAM regulator output programmed to 1.5V
	VPROG2		Low	VSTBY regulator output programmed to 2.6V	Pull up
			High	VSTBY regulator output programmed to 3.3V
	VPROG3		Low	VDLL regulator output programmed to 2.6V	Pull up
			High	VDLL regulator output programmed to 3.3V
	CORE_DIS		Low	Enable VDLL and VCORE linear regulators	Pull
			High	Disable VDLL and VCORE linear regulators	down
	STBY_OK		Low	VSTBY output regulator out of range (under voltage)	Open
			High	VSTBY output regulator fully operational	drain

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L9758	Functional block diagram

2 Functional block diagram

Figure 2. Functional block diagram

			VPROG2
	VBAT
	STBY			VBAT
		10 µF	VPROG1
	VBAT	22 µH	VBAT_SW
	RUN
				300µF
			VBAT_S
				BOOST
				RES_S
		0.1		GND_S
			10K	REXT
			VPROG3
			RST_TIM
			Rtim
			CORE_DIS
			TRACK_REF
			REF_SEL
				VS_DIS
			51K	IGN
				100 nF

PSU_EN

					STBY Vreg
				2.6V/3.3V, 10mA
					Bandgap
					VKAM Vreg
					1V/1.5V, 10mA
					Buck
		Charge	Band		Switchmode
					Power
			Gap
Boost Control		Pump	Ref.		Supply
	SMPSOsc.
		(5 MHz)	Linear Voltage Controller
			1.5V, 1.0A
					VCORE

	SOFT							Linear Voltage Controller
	START							2.5V / 3.5V, 1.0A
									VDDL
Oscillator								RESET Logic		Drain
/ Divider								VDDL Undervoltage		Open
								Power On Reset
								VDD5 Undervoltage

	EN_REG	Linear Voltage Regulator
		5V, 1.0A	VDD5
		Tracking Regulator
		50mA	VSA
	Analog
	MUX	Tracking Regulator
		50mA	VSB

			Tracking Regulator
EN_REG			50mA	VSC
			Tracking Regulator
			50mA	VSD

Power EN_REG

Up/Dn

SOFT START

STBY_OK

VSTBY

1 µF

VKAM

1 µF

SW	22 µH

22 µF

FDBK

VB

VCORE_DRV VCORE_FDBK VDDL_DRV

VDDL_FDBK

RSTL

RST5

VDD5

VCORE_FDBK

22 uF

VDDL

2.4K	22 uF

5.1K

10µF

VSA

2.2µF

VSB

2.2µF

VSC

2.2µF

VSD

2.2µF

IGN_ON

GND

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