A4407 datasheet(23/29 Pages) ALLEGRO

No. de pieza	A4407

Descripción Electrónicos	The A4407 is an automotive power management IC that uses a 2.2 MHz constant on-time (COT) buck pre-regulator to supply a 5 V linear regulator, a 5 V tracking/protected linear regulator,

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Fabricante Electrónico	ALLEGRO [Allegro MicroSystems]

Página de inicio	http://www.allegromicro.com

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2.2 MHz Constant On-Time Buck Regulator

With Two External and Two Internal Linear Regulators

A4407

23

Allegro MicroSystems, Inc.

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

Figure 14 shows recommended values of RDROP2 versus

MOSFET thermal resistance at various 1.5 V regulator maximum

current settings, I1V2LIM. This graph assumes a PCB temperature

of 135°C, a maximum MOSFET junction temperature of 175°C,

and 3.37 V from the upstream (3.3 V) linear regulator. This graph

takes into account the voltage drop across the 1.5 V current limit

resistor, RCL2.

After a value of RDROP2 is determined the designer should calcu-

late its maximum power dissipation (I2 × R) and select an appro-

priate component, allowing adequate design margin. Assuming

the RDROP2 value was chosen from figure 14, then figure 15

shows the power dissipated by RDROP2 versus the MOSFET ther-

mal resistance at various 1.5 V regulator current settings.

The exact value of RDROP2 is not critical, so a component with

1% or 5% tolerance could be used.

2.0

1.8

1.5

1.3

1.0

0.8

0.5

0.3

0

30

35

40

45

80

85

90

95 100

65

60

70

75

55

50

MOSFET Thermal Resistance (°C/W)

0.7

0.6

0.5

0.4

0.3

0.2

0.1

0

MOSFET Thermal Resistance (°C/W)

30

35

40

45

80

85

90

95 100

65

60

70

75

55

50

450

mA

375

mA

Figure 14. RDROP2 value versus 1.5 V MOSFET thermal resistance

at various 1.5 V regulator maximum current settings

Figure 15. RDROP2 power dissipation versus 1.5 V MOSFET thermal

resistance at various 1.5 V regulator maximum current settings

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