MP8868GLE datasheet(20/27 Pages) MPS

20 / 27 page

MP8868 – SYNCHRONOUS STEP-DOWN CONVERTER

MP8868 Rev.1.1

www.MonolithicPower.com

5/15/2015

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

2. Reg01 SysCntlreg1

NAME

BITS

DEFAULT

DESCRIPTION

D[7]

2C controlled turn-on or turn-off the part. When external EN pin is low,

the converter is off and I

2C is also shutdown. When EN pin is high, the

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

GO_BIT

D[6]

Switch bit of I

2C writing authority for output reference command only.

Set GO_BIT=”1” to enable the I

2C authority of writing output reference.

When the command is finished, GO_BIT will auto reset to “0” to prevent

false operation of VOUT scaling. If reference adjust is within 50mV,

GO_BIT won’t be auto reset to “0”. In this case need manually set

GO_BIT to “0”. Suggest writing GO_BIT=”1” first, then write the output

reference voltage.

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

Slew Rate

D[5:3]

100

011

8 mV/uS

111

0.5 mV/uS

D[2:1]

500kHz

750KHz

1MHz

Switching

Frequency

D[2:1]

1.5MHz

Mode

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

CCM.

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]

2C controlled voltage adjustment is done. Internal circuit compares DAC output with

“VOUT” pin voltage, if “VOUT” is in the 90%-110% range of DAC output, VID_OK bit is

high which means the voltage scaling is finished. Otherwise, VID_OK=”0”.

VID_OK compares DAC with VOUT/FB. UV 90%+-3%, OV 110%+-3%

D[3]

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

OTEW

D[2]

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

than 120˚C.

D[1]

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

D[0]

Output power good indication. When bit is high the VOUT power is good now. It means

the VOUT is higher than 90% of designed regulation voltage. See details in “Power

Good Indicator” Section.

MP8868GLE Datasheet(PDF) 20 Page - Monolithic Power Systems

MP8868GLE Datasheet(HTML) 20 Page - Monolithic Power Systems

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27

Datasheet Download

Link URL