PM6644 datasheet(10/35 Pages) STMICROELECTRONICS

10 / 35 page

Simplified application schematic

PM6644

10/35

Doc ID 023203 Rev 1

1.6

Typical operating characteristics

FB = VCC, RTON = 1 MΩ, VIN = 12 V, EN = VIN, BYP connected to the switching regulator

output, no load unless specified. Measurements performed on the evaluation kit

(PM6644_DFN).

Overvoltage trip threshold

Referred to FB nominal

regulation point, BYP= 3.47 V

+14

+20

Undervoltage threshold

Referred to FB nominal

regulation point, BYP= 3.47 V

Inputs and outputs

FB logic level

FB logic level to be in fixed

mode

VCC-0.8

EN level

All circuitry OFF

1.3

All circuitry ON

2.4

In the range Tj = 0 °C-70 °C limits are guaranteed by design and statistical analysis, not production tested. Production test

at Tj=25 °C.

Table 6.

Electrical characteristics (continued)

Symbol

Parameter

Test condition

Min.

Typ.

Max.

Unit

Figure 4.

Efficiency vs. load

Figure 5.

Switching frequency vs. load

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