MP8845C – 5A HIGH EFFICIENT SYNC. STEP DOWN SWITCHER WITH I2C

MP8845C Rev. 1.02

www.MonolithicPower.com

12

4/25/2014

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

© 2014 MPS. All Rights Reserved.

Table 1—Output Voltage Chart

(continued)

D[6:0]

VOUT

D[6:0]

VOUT

D[6:0]

VOUT

D[6:0]

VOUT

001 0110

0.7472

011 0110

0.9613

101 0110

1.1753

111 0110

1.3894

001 0111

0.7539

011 0111

0.9680

101 0111

1.1820

111 0111

1.3961

001 1000

0.7606

011 1000

0.9746

101 1000

1.1887

111 1000

1.4028

001 1001

0.7673

011 1001

0.9813

101 1001

1.1954

111 1001

1.4095

001 1010

0.7739

011 1010

0.9880

101 1010

1.2021

111 1010

1.4162

001 1011

0.7806

011 1011

0.9947

101 1011

1.2088

111 1011

1.4229

001 1100

0.7873

011 1100

1.0014

101 1100

1.2155

111 1100

1.4296

001 1101

0.7940

011 1101

1.0081

101 1101

1.2222

111 1101

1.4363

001 1110

0.8007

011 1110

1.0148

101 1110

1.2289

111 1110

1.4429

001 1111

0.8074

011 1111

1.0215

101 1111

1.2356

111 1111

1.4496

2. Reg01 SysCntlreg1

NAME

BITS

DESCRIPTION

Switching

Frequency

D[7:5]

D[7:5]

Switching

Frequency

D[7:5]

Switching Frequency

000

2.2MHz (Default)

100

1.25MHz

001

2MHz

101

1.11MHz

010

1.67MHz

110

1MHz

011

--

111

--

Reserved

D4

Reserved

Reserved

D3

Reserved

PG_LOHI

D2

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

reference. A high (default) will set “PGOOD” to detect both a positive and negative

excursion of VO from the reference

VIN_OVP

D1

A “1” disables the VIN OVP function. Converter will continue to operate. A low will turn-

off the converter when Vin reaches Vin Max.

Mode

D0

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

3. Reg02 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 just be discharged by load. A

high enables internal pull down.

Reserved

D3

Reserved

Slew Rate

D[2:0]

D[2:0]

SLEW RATE

D[2:0]

SLEW RATE

000

64 mV/μs

100

4 mV/μs

001

32 mV/μs

101

2 mV/μs

010

16 mV/μs

110

1 mV/μs

011

8 mV/μs

111

0.5 mV/μs

4. Reg03 ID1

NAME

BITS

DESCRIPTION

Vendor ID

D[7:4]

VENDOR ID

Die ID

D[3:0]

IC Type