STM32H7B3AI datasheet(155/238 Pages) STMICROELECTRONICS

155 / 238 page

Symbol

Parameter

Conditions

Min(1)

Typ(1)

Max(1)

Unit

VREFBUF_OUT

Voltage Reference Buffer

Output

Normal mode at 30°C,

ILOAD=100 µA

VSCALE = 000

2.496(3)

2.5000

2.504(3)

VSCALE = 001

2,0460

2.0490

2,0520

VSCALE = 010

1,8010

1.8040

1,8060

VSCALE = 011

1,4995

1.5015

1,5040

Degraded mode(2)

VSCALE = 000

VDDA− 150

VDDA

VSCALE = 001

VDDA− 150

VDDA

VSCALE = 010

VDDA− 150

VDDA

VSCALE = 011

VDDA− 150

VDDA

TRIM

Trim step resolution

±0.05

±0.1

Load capacitor

0.5

1.50

esr

Equivalent Serial Resistor of

Ω

ILOAD

Static load current

Iline_reg

Line regulation

2.8 V ≤ VDDA ≤ 3.6 V

ILOAD = 500 µA

200

ppm/V

ILOAD = 4 mA

100

ILOAD_reg

Load regulation

500 µA ≤ ILOAD ≤ 4 mA

Normal Mode

ppm/ mA

Tcoeff

Temperature coefficient

−40 °C < TJ < +130 °C

Tcoeff

VREFINT +

100

ppm/ °C

PSRR

Power supply rejection

100KHz

tSTART

Startup time

CL=0.5 µF

300

µs

CL=1 µF

500

CL=1.5 µF

650

IINRUSH

Control of maximum

DC current drive on

VREFBUF_OUT during startup

phase(4)

IDDA(VREFBUF)

VREFBUF consumption from

VDDA

ILOAD = 0 µA

µA

ILOAD = 500 µA

ILOAD = 4 mA

1. Guaranteed by design, unless otherwise specified.

2. In degraded mode, the voltage reference buffer cannot accurately maintain the output voltage (VDDA−drop voltage).

3. Guaranteed by tests in production.

4. To properly control VREFBUF IINRUSH current during the startup phase and the change of scaling, VDDA voltage should be in the range of

1.8 V-3.6 V, 2.1 V-3.6 V, 2.4 V-3.6 V and 2.8 V-3.6 V for VSCALE = 011, 010, 001 and 000, respectively.

STM32H7B3xI

Operating conditions

DS13139 - Rev 8

page 155/238

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