L99LD02 datasheet(17/66 Pages) STMICROELECTRONICS

номер детали	L99LD02

подробное описание детали	Automotive dual-phase boost DC/DC controller

PDF	66 Pages

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производитель	STMICROELECTRONICS [STMicroelectronics]

домашняя страница	http://www.st.com

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DS12448 Rev 3

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L99LD02

Boost controller

Figure 5. 1 or 2 phase configuration with single L99LD02 device

In case of 3 or 4 phase mode, two devices are needed with SYNC_I/O, BST_COMP and

BST_OUT pins connected together as shown in Figure 8: 3 or 4 phase configuration with

two L99LD02 devices. One of the devices must be configured as a master and other device

as a slave by a dedicated configuration bit.

Figure 6. Clock distribution and phase shift

In master mode, an internal oscillator is used. The switching frequency is configurable via

SPI by 3 bits. The clock signal is distributed in both boost channels and SYNC_I/O pin

(output) with configurable phase shift according to the desired number of phases – see

Table 4: Clock distribution – MASTER (internal clock source).

In slave mode, the device uses an external clock signal from SYNC_I/O pin (input mode).

This signal is used for boost channel 1 (no phase shift) and channel 2 (180˚ phase shift) –

see Table 5.

CLK1

CLK2

SYNC_OUT

Boost 1

Boost 2

SYNC_IN

SYNC_I/O

MASTER/SLAVE (1 bit)

Phase (2 bits)

Clock source

(SLAVE)

(MASTER)

BST_FREQ (3 bits)

L99LD02 датащи(PDF) 17 Page - STMicroelectronics