STM32MP151AAB3 datasheet(202/253 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32MP151A/D

202/253

DS12500 Rev 3

esr

Equivalent Serial

Resistor of CL

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/

Tcoeff

Temperature

coefficient

-40 °C < TJ < +125 °C

Tcoeff_

VREF

INT

+75

ppm/

°C

PSRR

Power supply rejection

100 kHz

tSTART

Start-up time(3)

CL = 0.5 µF

300

350

µs

CL = 1 µF

500

650

CL = 1.5 µF

650

800

IINRUSH

Control of maximum

DC current drive on

VREFBUF_OUT during

startup phase(4)

13.5

IDDA(VRE

FBUF)

VREFBUF

consumption from

VDDA

ILOAD = 0 µA

µA

ILOAD = 500 µA

ILOAD = 4 mA

RVREF

BUF_PullD

own

Pull-down resistor

when ENVR = HIZ = 0

100

Ω

1. Guaranteed by design.

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

3. if VREF+ pin has residual voltage when VREFBUF is enabled (VREFBUF_CSR.ENVR=1), this might create an overshoot

on VREFBUF output longer than tSTART.

To avoid this, it is necessary that VREF+ pin is correctly discharged before being enabled (below VREFBUF_OUT minus

1 V, for example below 1.5 V for VSCALE = 000)

This could be achieved by ensuring VREFBUF is in OFF mode (VREFBUF_CSR.ENVR=0 and VREFBUF_CSR.HIZ=0) for

sufficient time to discharge CL through VREFBUF pull-down.

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.

Table 80. VREFBUF characteristics(1) (continued)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

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