TLE9461ES datasheet(38/140 Pages) INFINEON

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TLE9461ES

Lite CAN SBC Family

System Features

Datasheet

Rev.1.1

2019-09-27

5.3

Charge Pump Output for Reverse Polarity Protection

A gate-driver (charge-pump output) is integrated in the TLE9461ES to drive external n-channel logic-level

MOSFETs on-board to provide Reverse Polarity Protection in the application or to control a KL. 30 switch (see

Figure 12). The gate voltage is provided at the pin VCP which should be connected as shown in Chapter 14.

The Charge Pump is able to drive up to 3 n-channel MOSFETs with a typ. Ron of 5mΩ.

A spread spectrum modulation feature is implemented for improved EMC behavior. Enabling and configuring

the spread spectrum modulation frequency is achieved via the SPI bits SS_MOD_FR.

Figure 12 Simplified Charge Pump Block

The charge pump output VCP is disabled in SBC Init Mode and can be configured in SBC Normal Mode via the

SPI bit CP_EN. To prevent an unintentional modification of the charge pump state the bit CP_EN can be

locked by setting the bit CFG_LOCK_0. In case the charge pump output must be disabled again then it is

necessary to clear CFG_LOCK_0 before.

The Charge Pump will also stay enabled in the SBC Stop, Sleep, Restart or Fail-Safe Mode if it was not disabled

before entering the respective mode. It does not switch-Off due to overvoltage.

Diagnosis is available by checking the bit CP_EN.

Device protection

against reverse

battery

VCP

Dedicated SBC

supply input

Fast switch off

path

Charge Pump

Output

Clamping Circuit

CP-EN

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