STM32U595AI datasheet(287/377 Pages) STMICROELECTRONICS

287 / 377 page

DS13633 Rev 1

287/377

STM32U59xxx

Electrical characteristics

343

VREFBUF_

OUT

(3)

(cont’d)

Voltage reference

buffer output

Degraded

mode(2)

VRS = 000

Min (VDDA - 0.15

;1.496)

-1.504

VRS = 001

Min (VDDA - 0.15

;1.795)

-1.805

VRS = 010

Min (VDDA - 0.15

;2.042)

-2.054

VRS = 011

Min (VDDA - 0.15

;2.493)

-2.507

TRIM

Trim step

0.1

0.175

0.25

Load capacitor(4)

0.5

1.10

1.50

µF

esr

CL equivalent serial

resistor

Ω

Iload

Static load current

RPD

Pull-down resistance

400

Ω

Iline_reg

Line regulation

VDDAmin ≤ VDDA ≤ 3.6 V,

Normal mode,

500 µA ≤ Iload ≤ 4 mA

±0.016

±0.033

±0.053

Iload_reg Load regulation(5)

Normal mode,

500 μA ≤ Iload ≤ 4 mA

400

ppm/

TCoeff

Temperature

coefficient

–40 °C < TJ < +130 °C

Tcoeff_vrefint

+ 50

ppm/

°C

PSRR

Power supply

rejection

100 kHz

tSTART

Startup time

CL = 0.5 µF

110

200

µs

CL = 1.1 µF

240

350

CL = 1.5 µF

320

500

IINRUSH

Control of DC

current drive on

VREFBUF_

OUT during startup

phase (6)

IDDA

(VREFBUF)

VREFBUF

consumption from

VDDA

Iload = 0 µA

µA

Iload = 500 µA

Iload = 4 mA

1. Specified by design and not tested in production, unless otherwise specified.

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

3. Evaluated by characterization. Not tested in production.

4. The capacitive load must include a 100 nF capacitor in order to cut off the high-frequency noise.

5. The load regulation value only takes into account the die and package resistance. The parasitic resistance on PCB

degrades this value.

6. To correctly control the VREFBUF inrush current during startup phase and scaling change, the VDDA voltage must 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 VRS = 000, 001, 010 and 011 respectively.

Table 106. VREFBUF characteristics(1) (continued)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

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