SPSB100 datasheet(108/213 Pages) STMICROELECTRONICS

108 / 213 page

Component

Block/Usage

Min

Typ Max Unit

Note

Cbst_Buck1(1)

Cbst_Buck2(1)

Bootstrap capacitor

37.6

56.4

Cbst_Buck3(1) Bootstrap capacitor

100

120

L_Buck3

Output inductor

Iout = 6 A

2.2

3.3

µH

Rdc: < 15 mΩ

Isat > 10 A

SRF > 15 MHz

SMD

Choice: SPM10040T-3R3M-HZ

Cc_Buck1_24(1)

Cc_Buck2_24(1)

F = 2.4 MHz

1.2

1.5

1.8

Cc_Buck3(1)

3.76

4.7

5.64

Rc_Buck1_24

Rc_Buck2_24

F = 2.4 MHz

14.25 15 15.75

kΩ

Rc_Buck3

0.95

1.05

kΩ

C_Buck1_04(1)

C_Buck2_04(1)

Output capacitor at 400

kHz

T = 27 °C

Vout_buck1 = 3.3 V

µF

ESR: < 15 mΩ

Rated voltage: > 10 VDC

X7R [±15% temperature characteristics]

Choice: CGA6P1X7R1A476M250AC

L_Buck1_04

L_Buck2_04

Output inductor at 400 kHz

Iout = 3 A

µH

Rdc : < 40mΩ

Isat > 8 A

SRF > 4 MHz

SMD

Choice: SPM12565VT-150M-D

Cc_Buck1_04(1)

Cc_Buck2_04(1)

F = 400 kHz

Rc_Buck1_04

Rc_Buck2_04

F = 400 kHz

4.84

5.1

5.35

kΩ

CVREG(1)

4.7

µF

max ESR < 0.1 Ω

Rated voltage > 5 V

X7R

Choice: CGA4J3X7R1A475K125AB

CLDO1(1)

2.2

µF

CLDO2(1)

2.2

µF

RNFSO1_PU

Pull-up resistor to Vbat

28.5

31.5

KΩ -

RIRQ_PU

Pull-up resistor to VIO

28.5

31.5

KΩ -

RNRST_PU

Pull-up resistor to VIO

28.5

31.5

KΩ -

CVIN12(1)

BUCK1, 2 input capacitor

µF

CVIN3(1)

BUCK3 input capacitor

µF

1. Capacitance to be dimensioned, for example, according to voltage drop out requirements.

8.2

External components calculation

8.2.1

BUCK1 and BUCK2 inductor

The value of the output inductor is usually calculated to satisfy the peak-to-peak ripple current requirement. For

the best compromise of cost, size and performance, it is suggested to keep the inductor current ripple between

20% and 40% of maximum load current.

For example, if:

SPSB100

Application circuit

DS14640 - Rev 2

page 108/213

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