L99LD02 datasheet(27/66 Pages) STMICROELECTRONICS

tên linh kiện	L99LD02

Giải thích chi tiết về linh kiện	Automotive dual-phase boost DC/DC controller

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27 / 66 page

DS12448 Rev 3

27/66

L99LD02

Functional description

in particular bit 27 FE1 is set. In normal mode the boost controllers are latched off, until the

following conditions are fulfilled:



TJX drops below the thermal shutdown reset threshold TTSD-TTSD_HYS.



Subsequently the microcontroller sends a read and clear command, in order to reset

OVT bit.

In fail safe mode (Limp Home), the device applies an auto restart with a period equal to

tAUTORESTART, provided that the TJX falls below TSD reset threshold (TTSD-TTSD_HYS).

4.2.4

VS under voltage lockout

Provided device is not supplied from BST_OUT if the VS supply falls below VS_UV (VS

under voltage threshold), the boost controllers will be deactivated, regardless of the SPI

control register. This feature is implemented, in order to avoid an operation of the external

mosfet of the boost controller in linear mode, due to a too low gate driver supply.

In this case, BST_OUT_SUPPLY bit is not set whilst VS_UV_FAIL bit is set (see bit <13> on

Table 26: SR#1: Status Register 1)

L99LD02 bảng dữ liệu(PDF) 27 Page - STMicroelectronics