ST L9758 User Manual

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, V

regulator

■ Programmable 3.3 V or 2.6 V, 2% @ 1 A, V

LDO regulator with external pass transistor

■ Programmable microcontroller core voltage

LDO regulator, V voltage divider and pass transistor

■ Programmable 1 V or 1.5 V, 10% @ 10 mA,

standby memory regulator (V

■ 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 V

■ Independent standby voltage monitor

DD5

, V

DDL

STANDBY_OK

■ Two power supply enable signals for different

voltage level signals

Table 1. Device summary

low dropout (LDO)

DD5

2% @ 1 A with external

CORE

supplies.

KAM

DDL

)

L9758

Multiple supply for engine control

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 V V

CORE

DD5

, V

DDL

and

Order code Temperature range Package Packing

L9758 -40 °C to +125 °C PowerSO-36 Tube

November 2010 Doc ID 14273 Rev 3 1/29

www.st.com

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

2/29 Doc ID 14273 Rev 3

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

Doc ID 14273 Rev 3 3/29

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

4/29 Doc ID 14273 Rev 3

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

Doc ID 14273 Rev 3 5/29

Pins configuration L9758

1 Pins configuration

Figure 1. Pins connection (top view)

GND

VBAT

VBAT_SW

BOOST

RES_S

GND_S

VBAT_S

IGN

IGN_ON

PSU_EN

VSD

VSC

VSB

VSA

TRACK_REF

REF_SEL

VS_DIS

REXT

Table 2. Pins description

Pin # Name Description

FDBK

VDD5

VDDL_DRV

VDDL_FDBK

VCORE_FDBK

VCORE_DRV

VPROG3

CORE_DIS

VPROG1

VPROG2

VKAM

VSTBY

STBY_OK

RST5

RSTL

RST_TIM

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

6/29 Doc ID 14273 Rev 3

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

level

Description

Low Enter in Stand-by Mode if also PSU_EN is low

IGN

High Enter in Run Mode

Low IGN is high

IGN_ON

High IGN is low

Low Enter in Stand-by Mode if also IGN is low

PSU_EN

High Enter in Run Mode

Low Enable VSB, VSC, VSD tracking regulators

VS_DIS

High Disable VSB, VSC, VSD tracking regulators

Low Voltage reference for VSA tracking regulator is VDD5

Ref_Sel

High

Voltage reference for VSA tracking regulator is VTRACK_REF

Type of

I/O

Pull

down

Open

drain

Pull

down

Pull

down

Pull

down

Doc ID 14273 Rev 3 7/29

Pins configuration L9758

Table 3. Control pins description (continued)

Pin name

RSTL

RST5

VPROG1

VPROG2

VPROG3

CORE_DIS

STBY_OK

Logic

level

Low VDDL output regulator out of range (under voltage)

High VDDL output regulator fully operational

Low VDD5 output regulator out of range (under voltage)

High VDD5 output regulator fully operational

Low VKAM regulator output programmed to 1V

High VKAM regulator output programmed to 1.5V

Low VSTBY regulator output programmed to 2.6V

High VSTBY regulator output programmed to 3.3V

Low VDLL regulator output programmed to 2.6V

High VDLL regulator output programmed to 3.3V

Low Enable VDLL and VCORE linear regulators

High Disable VDLL and VCORE linear regulators

Low VSTBY output regulator out of range (under voltage)

High VSTBY output regulator fully operational

Description

Type of

I/O

Open

collector

Open

collector

Pull up

Pull

down

Open

drain

8/29 Doc ID 14273 Rev 3

L9758 Functional block diagram

2 Functional block diagram

Figure 2. Functional block diagram

VBAT STBY

VBAT

RUN

22 µH

10 µF

0.1

TRACK_REF

VPROG2

VBAT

VPROG1

VBAT_SW

300µF

VBAT_S

BOOST

RES_S

GND_S

REXT

10K

VPROG3

RST_TIM

Rtim

CORE_DIS

REF_SEL

VS_DIS

51K

IGN

100 nF

PSU_EN

Boost

Oscillator

/ Divider

EN_REG

Control

Analog

MUX

EN_REG

Charge

Pump

(5 MHz)

SMPS Osc.

SOFT

START

STBY Vreg

2.6V/3.3V, 10mA

Bandgap

VKAM Vreg

1V/1.5V, 10mA

1.5V, 1.0A

5V, 1.0A

50mA

Switchmode

VCORE

VDDL

VDD5

VSA

VSB

VSC

VSD

EN_REG

SOFT START

Band

Gap Ref.

Linear Voltage Controller

2.5V / 3.5V, 1.0A

RESET Logic

VDDL Undervoltage VDD5 Undervoltage

Power On Reset

Linear Voltage Regulator

Tracking Regulator

Power Up/Dn

Buck

Power

Supply

Open Drain

STBY_OK

VSTBY

VKAM

FDBK

VCORE_DRV

VCORE_FDBK

VDDL_DRV

VDDL_FDBK

RSTL

RST5

VDD5

VSA

VSB

VSC

VSD

IGN_ON

GND

22 µH

22 µF

2.4K

5.1K

1 µF

VCORE_FDBK

22 uF

VDDL

22 uF

10µF

2.2µF

Doc ID 14273 Rev 3 9/29

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