MP8864 datasheet(21/29 Pages) MPS

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MP8864

– SYNCHRONOUS STEP-DOWN CONVERTER

MP8864 Rev. 1.02

www.MonolithicPower.com

1/18/2018

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

Table 2

—Output reference voltage chart (continued)

D[6:0]

VOUT

D[6:0]

VOUT

D[6:0]

VOUT

D[6:0]

VOUT

001 1101

0.89

011 1101

1.21

101 1101

1.53

111 1101

1.85

001 1110

0.90

011 1110

1.22

101 1110

1.54

111 1110

1.86

001 1111

0.91

011 1111

1.23

101 1111

1.55

111 1111

1.87

2. Reg01 SysCntlreg1

NAME

BITS

DEFAULT

DESCRIPTION

D[7]

I2C controlled turn-on or turn-off the part. When the external EN is low,

the converter is off, and the I2C is in shutdown. When EN is high, the EN

bit will take over. The default EN bit is “1.”

GO_BIT

D[6]

Switch bit of I2C writing authority for output reference command

only. Set GO_BIT=

“1” to enable the I2C authority of the writing output

reference. When the command is finished, GO_BIT is auto re-

set to “0” to

prevent false operation of VOUT scaling. If the reference is adjusted

within 50 mV, GO_BIT will NOT be auto re-set to

“0.” If this is the case,

manually set GO_BIT to

“0.” Writing GO_BIT=“1” first is recommended,

then write the output reference voltage.

Slew rate

D[5:3]

100

D[5:3]

SLEW RATE

D[5:3]

SLEW RATE

000

64 mV/us

100

4 mV/us

001

32 mV/us

101

2 mV/us

010

16 mV/us

110

1 mV/us

011

8 mV/us

111

0.5 mV/us

Switching

frequency

D[2:1]

600 kHz

850 kHz

1.1 MHz

1.6 MHz

Mode

A “0” enables PFM mode, a high disables PFM mode.

3. Reg02 ID1

NAME

BITS

DESCRIPTION

Vendor ID

D[7:4]

1000

IC revision

D[3:0]

IC revision

4. Reg03 Status

NAME

BITS

DESCRIPTION

Reserved

D[7:5]

Reserved for future use. Always set at

“0.”

VID_OK

D[4]

I2C controlled voltage adjustment is complete. The internal circuit compares the

DAC output with the VOUT voltage. If VOUT is in the 90%-110% range of the DAC

output, the VID_OK bit is high (which means the voltage scaling is complete).

Otherwise, VID_OK=

“0.”

D[3]

Output over-current indication. When the bit is high, the IC is in hiccup mode.

OTEW

D[2]

Die temperature early warning bit. When the bit is high, the die temperature is

above

120˚C.

D[1]

Over-temperature indication. When the bit is high, the IC is in thermal shutdown.

D[0]

Output power good indication. When the bit is high, the VOUT power is good. This

means the VOUT is higher than 90% of the designed regulation voltage. For additional

details, please refer to the

“Power Good Indicator” section on page 15.

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