STPM098C datasheet(13/110 Pages) STMICROELECTRONICS

13 / 110 page

3.1.2

VREF1 regulator

The internal supply rail for the digital core on STPM098C is generated by a current limited LDO regulator with a

PMOS output stage and an external tank capacitance supplied by VCC pin. Additionally, the VREF1 regulator is

intended as the reference voltage for up to eight external DrMOS current measurement analog output.

Figure 7. Regulator simplified block diagram

VCC

CFILT/VREF1

GND

VBG

CVREF1

Logic Core

NVM

DrMOS

REFIN

DrMOS

REFIN

Table 8. VREF1 regulator electrical characteristics

Symbol

Parameter

Test condition

Min Typ Max Unit

Notes

VREF1_iout

VREF1 output current for no

VREF1_UV

200

mA Total load = ext.+ int.

VREF1_vout

VREF1 output voltage

Iload = 0-150 mA

CVREF1 = 4.7 µF

1.71 1.8 1.89

Total load = ext.+ int.

VREF1_ilim

VREF1 current limitation

VREF1 = 0 V

200 325 450

mA Total load = ext.+ int.

VREF1_load_srv

VREF1 static load regulation

voltage

VCC = 5 V

Iload = 0-150 mA

CVREF1 = 4.7 µF

-15

mV Total load = ext.+ int.

VREF1_load_trv

VREF1 transient load regulation

voltage

VCC = 5 V

Iload = 0-150 mA

dIload/dt = 60 mA/µs

CVREF1 = 4.7 µF

-50

Total load = ext.+ int.

Guaranteed by design

T_vref1_boot_time VREF1 boot time

VREF1 10% to 90%

Iload = 100 mA

CVREF1= 4.7 µF

0.07 0.1

0.2

ms -

VREF1_ext_cap

External capacitor

ESR = 2 mΩ

3.76 4.7 5.64

Application information

STPM098C

Functional description

DS14440 - Rev 1

page 13/110

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