L5988D View Datasheet(PDF) - STMicroelectronics

Part Name

Description

MFG CO.

L5988D

4 A continuous (more than 5 A pulsed) step-down switching regulator with synchronous rectification

STMicroelectronics 

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Application information

L5988D

Table 14. Component list application circuit (fSW = 400 kHz)

Reference

Part number

Description

Manufacturer

C1

GRM32ER61E226KE15 Chip capacitor 22 µF 25 V

Murata

C10

GRM188R71E105KA12

Chip capacitor 1µF 25 V

Murata

C2A

GRM32ER61C476KE15 Chip capacitor 47 µF 16 V

C8

Chip capacitor 1 µF

C3

Chip capacitor 330 nF

C5

Chip capacitor 22 nF

C6

Chip capacitor 1 nF

C7

Chip capacitor 10 nF

L1

744 311 470

Inductor 4.7 µH

Wurth elektronik

R1

Chip resistor 12 k ± 1%

R2

Chip resistor 3.3 k ± 1%

R3

Chip resistor 220 k± 1%

R5

Chip resistor 1.2 k ± 1%

R6

Chip resistor 4.7 k ± 1%

R7

Chip resistor 56  ± 1%

R8

Chip resistor 4.7 k± 1%

R12

Chip resistor 5.6 R ± 1%

U1

I.C. L5988D

STMicroelectronics

In Figure 27 is shown an additional application example where the L5988D operates at

a switching of 600 kHz. The designed system bandwidth is 73 kHz with a the phase margin

of 51. The peak current limitation is set 5.2 A, the valley current limitation 5.8 A in order to

deliver up to 4 A DC to the load.

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DocID15324 Rev 4

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