L5965 datasheet(68/73 Pages) STMICROELECTRONICS

68 / 73 page

Contents

Overview ..........................................................................2

1.1

Simplified block diagram ........................................................ 2

1.2

Functional block diagram ........................................................ 3

Pins description ...................................................................4

Electrical specifications ...........................................................6

3.1

Absolute maximum ratings & operating voltage ..................................... 6

3.2

Thermal data .................................................................. 7

3.2.1

Thermal resistance ....................................................... 7

3.2.2

Thermal warning and protection ............................................. 7

3.3

Electrical characteristics......................................................... 8

3.3.1

Electrical characteristic curves ............................................. 16

Functional description ............................................................17

4.1

Programming by OTP .......................................................... 17

4.2

Voltage regulators and features description........................................ 18

4.2.1

VREG ................................................................ 18

4.2.2

Pre regulator BUCK1 .................................................... 18

4.2.3

Pre-regulator BUCK2 .................................................... 20

4.2.4

Post regulator BUCK3.................................................... 20

4.2.5

Post regulator BUCK4.................................................... 21

4.2.6

BOOST ............................................................... 22

4.2.7

LDO ................................................................. 22

4.2.8

VREF ................................................................ 22

4.2.9

ADC ................................................................. 23

4.2.10

Wake up pin (WKUP) .................................................... 23

4.2.11

Synchronizing pin (SYNC in/out) ............................................ 23

4.2.12

Reset and Fault......................................................... 25

4.2.13

Configurable watchdog and reset ........................................... 26

4.2.14

Under-Voltage, Over-Voltage and Power-Good................................. 29

4.2.15

Temperature control and VBATx voltage through internal ADC ..................... 29

4.2.16

Maximum Duty Cycle and Refresh Mode for Buck .............................. 31

4.2.17

Frequency-Hopping Spread Spectrum ....................................... 31

SPI format and register mapping ..................................................32

5.1

SPI frame CRC generator ...................................................... 34

5.2

SPI registers mapping ......................................................... 35

5.2.1

SPI REG BUCK1 ....................................................... 35

L5965

Contents

DS12567 - Rev 3

page 68/73

L5965 Datasheet(PDF) 68 Page - STMicroelectronics

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