LP8725TLE-ASLASHNOPB datasheet(34/46 Pages) TI1

34 / 46 page

LP8725

SNVS618G – DECEMBER 2009 – REVISED MAY 2013

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Table 13. Suggested Inductors and Suppliers

Model

Vendor

Dimensions LxWxH (mm)

DCR (m

Ω)

LQM2HPN 1R0MG0

Murata

2.5 x 2.0 x 1.0 (Max)

MIPSZ2520D1R0

FDK

2.5 x 2.0 x 1.0 (Max)

MIPSZ2012D1R0

FDK

2.0 x 1.25 x 1.0 (Max)

LPS3010-102NLC

Coilcraft

3.3 x 3.3 x 1.0 (Max)

Table 14. Suggested Capacitors and Suppliers

Model

Type

Vendor

Voltage Rating

Case Size Inch (mm)

4.7 µF for CIN and COUT

C1608X5R0J475K

Ceramic

TDK

6.3

0603 (1608)

C1608X5R1A475K

Ceramic

TDK

0603 (1608)

Dynamic Voltage Scaling

Buck 1 and Buck 2 can be switched between two output values stored in registers 0x08 and 0x09 for Buck1 and

0x0A and 0x0B for Buck2.

For Buck 2 output this control is achieved by changing the DVS2_V bit in the GENERAL register 0x00 (bit 3).

DVS2_V

OUTPUT

Reg0x00 Bit3

BUCK2_V2

Reg 0x0B[4-0]

BUCK2_V1

Reg 0x0A[4-0]

For Buck 1 this control can be either via the external DVS pin or via the DVS1_V bit in the GENERAL register

0x00 (bit 2). The control configurations are shown in the following table.

DVS1

DVS pin

OUTPUT

Reg0x00 Bit2

BUCK1_V2

Reg 0x09[4-0]

BUCK1_V1

Reg 0x08[4-0]

BUCK1_V2

Reg 0x09[4-0]

BUCK1_V1

Reg 0x08[4-0]

LDO Information

There are all together 7 LDOs in LP8725 grouped as

•

DIGITAL;

•

ANALOG; and

•

LOW INPUT LOW OUTPUT (LILO)

All LDOs can be programmed through serial interface for different output voltage values, which are summarized

in the output voltage selection tables.

At the PMU power on, LDOs startup according to the selected startup sequence and the default voltages. See

STARTUP and SHUTDOWN Sequences for details.

For stability all LDOs need to have external capacitors COUT connected to the output with recommended value of

1µF. It is important to select the type of capacitor whose capacitance will in no case (voltage, temperature, etc)

be outside of limits specified in the LDO electrical characteristics.

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