MP8848 – 6A, HIGHLY EFFICIENT, SYNC, STEP-DOWN SWITCHER WITH I

MP8848 Rev. 1.0

www.MonolithicPower.com

14

2/16/2017

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3. Reg02 SysCntlreg1

NAME

BITS

DESCRIPTION

Switching

Frequency

D[7:5]

D[7:5]

Switching Frequency

D[7:5]

Switching Frequency

000

2.2MHz

100

1.25MHz (default)

001

2MHz

101

1.11MHz

010

1.67MHz

110

0.85MHz

011

--

111

--

Transient

Response

D[4:3]

D[4:3]

Response Speed

D[4:3]

Response Speed

00

Ultra-fast

01

Fast (default)

10

Normal

11

Slow

PG_LOHI

D2

A “0” here sets PG to sense only a negative voltage excursion of Vo from the

reference. A “1” (default) sets PG to detect both a positive and negative excursion of

Vo from the reference.

VIN_OVP

D1

A “1” disables the VIN OVP function. The converter continues operating. A “0” (default)

turns off the converter when VIN reaches VIN MAX.

Mode

D0

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

4. Reg03 SysCntlreg2

NAME

BITS

DESCRIPTION

Reserved

D[7:6]

Reserved.

Go

D5

Writing to this bit starts a VOUT transition regardless of its initial value.

Output

Discharge

D4

A “0” disables the output discharge. The output voltage must be discharged by the

load. A high enables the internal pull-down.

Gl_filt

D3

A “0” disables the PG delay.

Slew Rate

D2

D2

Slew Rate

D2

Slew Rate

0

32mV/μs

1

8mV/μs

P3 Enable

D1

A “1” enables the P3 set function. Only a “1” can make the P3 Set bit control the AVIN

voltage.

P3 Set

D0

When the P3 Enable bit = 1, the AVIN voltage is pulled high if P3 Set = 0; otherwise,

the AVIN voltage is pulled low.

5. Reg04 ID1

NAME

BITS

DESCRIPTION

Vendor ID

D[7:4]

Vendor ID.

Die ID

D[3:0]

IC type.

6. Reg05 ID2

NAME

BITS

DESCRIPTION

Reserved

D[7:4]

Reserved.

Die Rev

D[3:0]

Die revision.

Operation Status

CONDITION

PG

REGULATION

LATCH-OFF

STATUS BIT

VIN over-voltage

Low

Off

No

OVP

VIN under-voltage

Low

Off

N/A

UVLO

Thermal warning

Low

On

No

OTW

Thermal shutdown

Low

Off

Yes

N/A

Current limit

High

On

No

ILIM

Output under-voltage

Low

Off

Yes

VoUV

Output over voltage (>110% of target output)

Low

On

No

VoOV