SPSB100 datasheet(88/213 Pages) STMICROELECTRONICS

88 / 213 page

Symbol

Parameter

Condition

Min

Typ

Max

Unit

Tsoftstart_buck_00(1)

Soft start time slope when start-

BUCK3_SS_VALUE = 00

5.28

8.7

12.32 V/ms

Tsoftstart_buck_01(1)

Soft start time slope when start-

BUCK3_SS_VALUE = 01

2.64

4.35

6.16

V/ms

Tsoftstart_buck_10(1)

Soft start time slope when start-

BUCK3_SS_VALUE = 10

1.08

1.75

2.52

V/ms

Tsoftstart_buck_11(1)

Soft start time slope when start-

BUCK3_SS_VALUE = 11

0.552

0.87

1.288 V/ms

Fsw_buck3

Switching frequency

2.0

2.4

2.8

MHz

Fspread_buck3(1)

Spread spectrum range

-8

PHI_buck3(1)(3)

Phase shift to BUCK1

200

250

300

deg

RPD_OFF_Buck3

Pull-down resistor in off

Vout = 3.3 V

120

150

180

Ω

1. Guaranteed by design.

2. Guaranteed by bench measurements. Performances verified in applicative conditions. Tested in static load conditions (Iload

= 150 mA).

3. Digital implementation is guaranteed by scan test.

Below are the efficiency curves for BUCK3:

Figure 55. Vout = 3.3 V and VIN3 = 5 V

60%

65%

70%

75%

80%

85%

90%

95%

100%

0.00

0.50

1.00

1.50

2.00

2.50

3.00

3.50

4.00

4.50

Figure 56. Vout = 1.25 V and VIN3 = 3.3 V

60%

65%

70%

75%

80%

85%

90%

95%

100%

0.00

0.50

1.00

1.50

2.00

2.50

3.00

3.50

4.00

4.50

SPSB100

Electrical characteristics

DS14640 - Rev 2

page 88/213

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