STM32L433CB datasheet(219/225 Pages) STMICROELECTRONICS

Part #	STM32L433CB

Description	Ultra-low-power Arm® Cortex®-M4 32-bit MCUFPU, 100DMIPS, up to 256KB Flash, 64KB SRAM, USB FS, LCD, ext. SMPS

PDF	225 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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219 / 225 page

DS11449 Rev 5

219/225

STM32L433xx

Package information

219

Assuming the following application conditions:

Maximum ambient temperature TAmax = 100 °C (measured according to JESD51-2),

IDDmax = 20 mA, VDD = 3.5 V, maximum 20 I/Os used at the same time in output at low

level with IOL = 8 mA, VOL= 0.4 V

PINTmax = 20 mA × 3.5 V= 70 mW

PIOmax = 20 × 8 mA × 0.4 V = 64 mW

This gives: PINTmax = 70 mW and PIOmax = 64 mW:

PDmax = 70 + 64 = 134 mW

Thus: PDmax = 134 mW

Using the values obtained in Table 115 TJmax is calculated as follows:

–

For LQFP64, 46 °C/W

TJmax = 100 °C + (46 °C/W × 134 mW) = 100 °C + 6.164 °C = 106.164 °C

This is above the range of the suffix 6 version parts (–40 < TJ < 105 °C).

In this case, parts must be ordered at least with the temperature range suffix 7 (see

Section 8: Ordering information) unless we reduce the power dissipation in order to be able

to use suffix 6 parts.

Refer to Figure 67 to select the required temperature range (suffix 6 or 7) according to your

ambient temperature or power requirements.

Figure 67. LQFP64 PD max vs. TA

MSv32143V1

600

100

200

300

400

500

700

105

115

125

135

Suffix 6

Suffix 7

TA (°C)

STM32L433CB Datasheet(PDF) 219 Page - STMicroelectronics