A6986 datasheet(28/67 Pages) STMICROELECTRONICS

tên linh kiện	A6986

Giải thích chi tiết về linh kiện	38 V, 2 A synchronous step-down switching regulator with 30 µA quiescent current

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Functional description

A6986

28/67

DocID026211 Rev 6

Figure 17. The regulator works in CCM

5.6

Switchover feature

The switchover maximizes the efficiency at light-load that is crucial for LCM applications.

5.6.1

LCM

The LCM operation satisfies the high efficiency requirements of the battery powered

applications. In order to minimize the regulator quiescent current request from the input

voltage, the VBIAS pin can be connected to an external voltage source in the range

3 V < VBIAS < 5.5 V (see Section 5.1: Power supply and voltage reference on page 15).

In case the VBIAS pin is connected to the regulated output voltage (VOUT), the total current

drawn from the input voltage can be calculated as:

Equation 14

where IQ OP VIN, IQ OP VBIAS are defined in Table 5: Electrical characteristics on page 8

and

A6986 is the efficiency of the conversion in the working point.

5.6.2

LNM

Equation 14 is also valid when the device works in LNM and it can increase the efficiency at

medium load since the regulator always operates in continuous conduction mode.

IQVIN

IQOPVIN



A6986

-----------------

VBIAS

VIN

--------------- IQOPVBIAS



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