LP8733 datasheet(64/82 Pages) TI1

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SW_B0

VIN_B0

VIN_B1

VANA

VIN

FB_B0

VOUT_B0

LOAD

SDA

SCL

nINT

CLKIN (GPO2)

GNDs

GPO

SW_B1

FB_B1

PGOOD

VOUT_LDO1

VOUT_LDO0

VIN_LDO0

VIN_LDO1

VOUT_LDO0

VOUT_LDO1

COUT_BUCK0

COUT_BUCK1

COUT_LDO1

COUT_LDO0

CIN_LDO1

CIN_LDO0

CIN_BUCK0

CIN_BUCK1

CANA

CPOL_BUCK

LP8733

SNVSBK2 – SEPTEMBER 2019

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Product Folder Links: LP8733

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Typical Applications (continued)

(1)

Operating temperature range is up to 125°C including self temperature rise.

Figure 69. Single Dual-Phase Buck Output Configuration

8.2.1 Design Requirements

8.2.1.1 Inductor Selection

The inductors L0 and L1 are shown in the Typical Applications. The inductance and DCR of the inductor affects

the control loop of the buck regulator. TI recommends using inductors similar to those listed in Table 47. Pay

attention to the saturation current and temperature rise current of the inductor. Check that the saturation current

is higher than the peak current limit and the temperature rise current is higher than the maximum expected rms

output current. The minimum effective inductance to ensure good performance is 0.22 μH at maximum peak

output current over the operating temperature range. DC resistance of the inductor must be less than 0.05 Ω for

good efficiency at high-current conditions. The inductor AC loss also affects conversion efficiency. Higher Q

factor at switching frequency usually gives better efficiency at light load to middle load. Shielded inductors are

preferred, as they radiate less noise.

Table 47. Recommended Inductors

MANUFACTURER

PART NUMBER

VALUE

DIMENSIONS L × W × H (mm)

RATED DC CURRENT

ISAT maximum (typical) /

ITEMP maximum (typical) (A)

DCR

typical / maximum (m

Ω)

TOKO

DFE252012PD-

R47M

0.47 µH (20%)

2.5 × 2 × 1.2

5.2 (–) / 4 (–)(1)

— / 27

Tayo Yuden

MDMK2020TR47M

0.47 µH (20%)

2 × 2 ×1.2

4.2 (4.8) / 2.3 (2.45)

40 / 46

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