MP8864

– SYNCHRONOUS STEP-DOWN CONVERTER

MP8864 Rev. 1.02

www.MonolithicPower.com

20

1/18/2018

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

© 2018 MPS. All Rights Reserved.

REGISER DESCRIPTION

Register Map

ADD

NAME

R/W

D7

D6

D5

D4

D3

D2

D1

D0

00

VSEL

R/W

V_BOOT

Output reference

01

SysCntlreg1

R/W

EN

GO_BIT

Slew rate

Switching

frequency

Mode

02

ID1

R

Vendor ID

IC revision

03

Status

R

Reserved

VID_OK

OC

OTEW

OT

PG

Register Description

1.

Reg00 VSEL

NAME

BITS

DEFAULT

DESCRIPTION

V_BOOT

D7

1

FB control loop enable bit. V_BOOT=

“1” means the output voltage is

determined by a resistor divider connected to FB (the FB control loop).

V_BOOT=

works efficiently with FB.

Output

reference

D[6:0]

0000000

Output reference voltage. Set the output reference voltage from 0.6 V to

1.87 V (see Table 2). The default value is 0.6 V. If FB is connected to VCC,

the default value is 0.9 V.

Table 2

—Output reference voltage chart

D[6:0]

VOUT

D[6:0]

VOUT

D[6:0]

VOUT

D[6:0]

VOUT

000 0000

0.60

010 0000

0.92

100 0000

1.24

110 0000

1.56

000 0001

0.61

010 0001

0.93

100 0001

1.25

110 0001

1.57

000 0010

0.62

010 0010

0.94

100 0010

1.26

110 0010

1.58

000 0011

0.63

010 0011

0.95

100 0011

1.27

110 0011

1.59

000 0100

0.64

010 0100

0.96

100 0100

1.28

110 0100

1.60

000 0101

0.65

010 0101

0.97

100 0101

1.29

110 0101

1.61

000 0110

0.66

010 0110

0.98

100 0110

1.30

110 0110

1.62

000 0111

0.67

010 0111

0.99

100 0111

1.31

110 0111

1.63

000 1000

0.68

010 1000

1.00

100 1000

1.32

110 1000

1.64

000 1001

0.69

010 1001

1.01

100 1001

1.33

110 1001

1.65

000 1010

0.70

010 1010

1.02

100 1010

1.34

110 1010

1.66

000 1011

0.71

010 1011

1.03

100 1011

1.35

110 1011

1.67

000 1100

0.72

010 1100

1.04

100 1100

1.36

110 1100

1.68

000 1101

0.73

010 1101

1.05

100 1101

1.37

110 1101

1.69

000 1110

0.74

010 1110

1.06

100 1110

1.38

110 1110

1.70

000 1111

0.75

010 1111

1.07

100 1111

1.39

110 1111

1.71

001 0000

0.76

011 0000

1.08

101 0000

1.40

111 0000

1.72

001 0001

0.77

011 0001

1.09

101 0001

1.41

111 0001

1.73

001 0010

0.78

011 0010

1.10

101 0010

1.42

111 0010

1.74

001 0011

0.79

011 0011

1.11

101 0011

1.43

111 0011

1.75

001 0100

0.80

011 0100

1.12

101 0100

1.44

111 0100

1.76

001 0101

0.81

011 0101

1.13

101 0101

1.45

111 0101

1.77

001 0110

0.82

011 0110

1.14

101 0110

1.46

111 0110

1.78

001 0111

0.83

011 0111

1.15

101 0111

1.47

111 0111

1.79

001 1000

0.84

011 1000

1.16

101 1000

1.48

111 1000

1.80

001 1001

0.85

011 1001

1.17

101 1001

1.49

111 1001

1.81

001 1010

0.86

011 1010

1.18

101 1010

1.50

111 1010

1.82

001 1011

0.87

011 1011

1.19

101 1011

1.51

111 1011

1.83

001 1100

0.88

011 1100

1.20

101 1100

1.52

111 1100

1.84