ST1S09 Ver la hoja de datos (PDF) - STMicroelectronics

Número de pieza

componentes Descripción

Fabricante

ST1S09

2 A, 1.5 MHz PWM step-down switching regulator with synchronous rectification

STMicroelectronics 

Typical performance characteristics

ST1S09

Figure 15. Efficiency vs. temperature

Figure 16. Over voltage protection vs.

temperature

100

95

VO=3.3V

90

85

80

75

VO=1.2V

70

65

60

55

VI=5V, IO=100mA

50

45

40

-75 -50 -25 0 25 50 75 100 125 150 175

T [°C]

1.4

Resistor 1.2kΩ from VI and VSW

1.3

VSW=1.2V

VI=5V, VO=3.3V, CFB=100nF

1.2

1.1

OVP ON

1

0.9

0.8

-75 -50 -25 0

25 50 75 100 125 150 175

T [°C]

Figure 17. Over voltage protection vs.

temperature

Figure 18. Over voltage protection hyst. vs.

temperature

1.4

Resistor 1.2kΩ from VI and VSW

1.3

VSW=0.8V

VI=5V, VO=3.3V, CFB=100nF

1.2

1.1

OVP ON

1

0.9

0.8

-75 -50 -25 0

25 50 75 100 125 150 175

T [°C]

14

12

Resistor 1.2kΩ from VI and VSW

10

VSW=0.8V

VI=5V, VO=3.3V, CFB=100nF

8

6

4

OVP ON

2

0

-75 -50 -25 0 25 50 75 100 125 150 175

T [°C]

Figure 19. Load transient

Figure 20. Inhibit transient

VO

VINH

VO

IO

IO

VI = 5 V, VO = 1.2 V, IO = 100 mA to1 A, L = 3.3 µH,

CI = 4.7 µF, CO = 22 µF

VI = 5V, VINH = 0 to 2 V, IO = 2 A, L = 3.3 µH, CI = 4.7 µF,

CO = 22 µF, VO = 3.3 V

10/18

Doc ID 13632 Rev 4

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