ST L5965 User Manual

UM2564

User manual

L5965 evaluation board

Introduction

L5965 is a multichannel voltage regulator specifically designed to support applications that need to fulfill functional safety
requirements as defined by Automotive Safety Integrity Level (ASIL).

It is available in VQFPN-48 package.

This document describes how to use the L5965 application board in order to check device's performance.

Please refer to the datasheet.

Figure 1. L5965 evaluation board

UM2564 - Rev 1 - June 2019

For further information contact your local STMicroelectronics sales office.

www.st.com

1 Board description

The demo board is an evaluation tool for L5965. L5965 embeds 1 controller and 1 buck that can both be supplied
by the car battery and used as pre-regulators, 2 buck post-regulators, 1 boost, 1 linear regulator and 1 precise
voltage reference. For further details on the device please refer to the datasheet.

Useful connectors available on the board:

• J1 = VBUCK1 (Buck1 output connector)

• J2 = VBAT1 (Battery input power supply, supplying Buck1 and Buck2)

• J3 = SYNCIN and ground pin connections

• J4 = SYNCOUT and ground pin connections

• J5 = Service/Voltage signals/VREF output connector

• J6 = EXTSUP (Alternative IC power supply connector)

• J11 = VBUCK2 (Buck2 output connector)

• J12 = SPI bus connector

• J14 = VBUCK3 (Buck3 output connector)

• J17 = VBUCK4 (Buck4 output connector)

• J18 = VSLDO LDO (Ldo input power supply connector)

• J21 = LDO (Ldo output connector)

• J22 = VBOOST (Boost output connector)

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Board description

Figure 2. Board top view design

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2 Board operation

The demonstration board is already set to allow the evaluation of the PMIC features. For a basic use, no
preliminary operation is necessary. Just connect a compatible voltage to the connector J2 (VBAT1) and check the
output signals on proper connectors.

Buck2, Buck3, Buck4, Boost and Vref are switched on automatically.

Buck1 and Ldo have been programmed in order to be enabled by SPI (for instruction, please read the product
datasheet, chapter 5). The Ldo input (J18) has to be connected by a wire with the output of a Buck regulator
(Buck2, for instance, on J11).

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Board operation

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3 Programming option

The L5965 mounted on this demonstration board is programmed as follows (see product datasheet, chapter 6.8).

Buck2 is the main regulator and provides 3.3 V at 3 A and 0.4 MHz. This is the pre-regulator that supplies the
others. Buck3 is the second regulator to switch on, and provides 2 V. Buck4 is the third regulator, supplying 1.8 V.
The fourth regulator to start is the Boost, providing 5 V and the latest one is the VREF, 3.3 V.

The reset is released after the Power Good of the main regulator (Buck2). In case of failures, the RESET_B signal
doesn’t affect the State Machine, then the regulator can still be evaluated in this condition. Also an overvoltage
cannot assert a reset. All these regulators turn on with a delay of 10 ms among them.

Buck1 and Ldo should be enabled by SPI. Once enabled, Buck1 provides 1.2 V and the Ldo supplies 1.3 V at 600
mA.

A watchdog is not required to operate the PMIC and rewriting OTP programming is forbidden.

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Programming option

Figure 3. OTP programming

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4 SPI connector

SPI signals are available on the J12 connector.

The SPI bus can be also used to monitor the PMIC diagnostics.

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SPI connector

Figure 4. Demo board SPI connector

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5 Board schematic

SYNCIN

SYNCOUT

REF

RESET _B

VREG

Debug

DO

DI

CLK

CSN

WDI

CLK

DO

CSN

REF

WKUP

WDI

RESET _B

FAULT

VREG

DI

FAULT

WKUP

C11

47nF

J9

R4

0.06R 1W 683-6580

C2 100nF

R2

0 n.m.

R8

47K

R12 100K

R23 0R

C14 2.2nF

1
2
3
4
5
6
7

J5

CONN 2.54X7

R280R

L5 6.8uH

C17

3.3uF

J3

R35

1.25K

C21

220nF

C26

3.3uF

R3

0 n.m.

C7

2.2uF 25V

C20

47nF

6
3
4
2
5
1

J12

CONN 2.54X6

R130R

1
2

J6

L3 2.2uH

C10

100nF

C5

100nF

J25

1
2

J2

C16

47nF

R140 n.m.

C4

10uF

1
2

J21

+

C29

22uF 40V

J26

C22

3.3uF

C24

100nF

C23

3.3uF

R10 20K

R15 100K

C1100nF

R22 0R

1
2

J1

C18

3.3uF

1
2

J22

R70R

R5 47K

+

C28

100uF 40V

R1

0R

J24

R190R

R24 0R

1
2

J11

1
2

J17

C12

10uF

C25

3.3uF

C9 910pF

C6

100nF

R16 10K

C27

3.3uF

C15

100nF

J10

C19

100nF

R30 1.8K

1
2

J14

+

C8

470uF 40V

R17 10K

R21 0R

L1 15uH

R27 10K

C13

10uF

DO

41

VBOOST_S

28

EXTSUP

3

VREG

4

BST1

5

GH1

6

PH1

7

GL1

8

PGND1

9

D

G

N

D

44

VREG1_S

13

COMP1

12

VBAT2

33

BST2

34

PH2

32

PGND2

31

VREG2_S

30

COMP2

29

VIN3

16

BST3

15

PH3

17

PGND3

18

PH4

22

BST4

24

VIN4

23

VREG3_S

19

VBAT1

2

A

G

N

D

46

S

GND

45

Sensen

11

SYNCIN

35

Sensep

10

SYNCOUT

36

REF

1

VSLDO

48

LDO

47

FAULT

43

WDI

37

RESET_B

42

WKUP

25

Debug

14

CSN

38

CLK

40

DI

39

P

GND

5

27

PH5

26

VREG4_S

20

PGND4

21

U1

L5965_QFN48

1
2

J18

R330R

C3

10uF

J4

GNDANA

VBUCK2

VBUCK2

VBUCK2

VBUCK2_pol

VBAT1

VBAT1

VBUCK2_pol

VBAT1

VBUCK2_pol

VBUCK1

VBUCK3

VBUCK4

VBUCK5

VBUCK2_pol

VBUCK2

VBUCK2

LDO

VBAT1

EXTSUP

EXTSUP

VBUCK1

VBAT1

SYNCIN

SYNCOUT

No Jumpe r

VBAT1

-

+

EXSUP

-

+

VSLDO

-

+

1.3V

-

+

VBUCK5 5V

-

+

VBUCK4 1.8V

-

+

VBUCK3 2V

-

+

VBUCK2 3.3V 3A

-

+

VBUCK1 1.2V

-

+

VBAT1

CSN

DI

DO

CLK

GND

Debug

WDI

REF

WKUP

RESET_B

FAULT

VREG

GND

+

C30

100uF 40V

4

1 5

6

7

8

2

3

Q1
STL11N4LLF5

4

1

5

6

7

8

2

3

Q2
STL11N4LLF5

XAL1010-153

+

C31

100uF 40V

L2 15uH

XAL1010-153

+

C32

100uF 40V

XAL7070-222

L4 2.2uH

XAL7070-222

+

C33

100uF 40V

XAL1010-682

1

F1

1

F2

1

F3

1

F4

1

TP1

PGND

C34100nF

C35100nF

PGND5

PGND5 PGND5

PGND5

PGND4 PGND4

PGND3 PGND3

PGND2 PGND2

PGND1PGND1

PGND1

PGND2

PGND3

PGND4

PGND4PGND3PGND2PGN D1

R9 0R

R11 0R

J7

1 2

D1

STPS5L60-Y

GNDANA

GNDANA

GNDANA

3.3V

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Board schematic

Figure 5. Board schematic

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6 Information on board use

This evaluation board/kit is intended for the following uses:

• Engineering development

• Demonstrations

• Evaluation purposes only

It is not considered by ST Microelectronics (STM) to be a finished end-product fit for general consumer use. The
people who handle the product(s) must have electronics training and must observe good engineering standard
practices.

For this reason the goods being provided are not intended to be complete in terms of required design, marketing,
and/or manufacturing-related protective considerations, including product safety and environmental measures
typically found in end products that incorporate such semiconductor components or circuit boards. This evaluation
board/kit does not fall within the purpose of the European Union directives regarding electromagnetic
compatibility, restricted substances (RoHS), recycling (WEEE), FCC, CE or UL, and therefore may not meet the
technical requirements of these directives or other related directives.

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Information on board use

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Revision history

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Table 1. Document revision history

Date Version Changes

17-Jun-2019 1 Initial release.

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Contents

Contents

1 Board description .................................................................2

2 Board operation ...................................................................3

3 Programming option...............................................................4

4 SPI connector .....................................................................5

5 Board schematic ..................................................................6

6 Information on board use ..........................................................7

Revision history ........................................................................8

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IMPORTANT NOTICE – PLEASE READ CAREFULLY

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Information in this document supersedes and replaces information previously supplied in any prior versions of this document.

© 2019 STMicroelectronics – All rights reserved

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