MP8847 – 6A, 2.7V-6V, HIGH-EFFICIENCY, SYNCHRONOUS

STEP-DOWN SWITCHER WITH I

MP8847 Rev. 1.02

www.MonolithicPower.com

15

12/28/2017

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

© 2017 MPS. All Rights Reserved.

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 PGOOD to sense only a negative voltage excursion of VO from the

reference. A “1” (default) sets PGOOD 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 PGOOD delay.

Slew Rate

D2

D2

Slew rate

D2

Slew rate

0

32mV/μs

1

8mV/μs

PG Control

D1

A“0”enable the PG function. A“1” disables the PG function, and then the PG voltage is

set by the PG Set bit.

PG Set

D0

When the PG Control bit=1, the PG voltage is pulled high if PG Set=0; otherwise, the

PG 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