KTB8331

December 2021

– Revision 04b

Page 18 of 25

Kinetic Confidential

VSEL1 Configuration Register

Register Address 0x01

Bit

Name

Access

Default

Reset

Description

7

EN1

R/W

1

Software Buck Enable. When EN pin is low, the regulator is off.

When EN pin is high and VSEL pin is high, the EN1 bit takes

precedent.

EN pin

VSEL pin

EN1 bit

Regulator

0

X

X

off

1

1

0

off

1

1

1

on

6:0

VOUT_VSEL1[6:0]

R/W

xxx xxxx

Sets the nominal VOUT regulation voltage when VSEL pin is high.

When RANGE bit is low, the VOUT range is from 0.600 to 1.39375V.

When RANGE bit is high, the VOUT range is from 1.440 to 3.345V.

������������������������ = ������ × (600������������ + 6.25������������ × ������������������������_������������������������1)

where G = 1.0 when RANGE bit is low, and G = 2.4 when RANGE

bit is high.

CONTROL Configuration Register

Register Address 0x02

Bit

Name

Access

Default

Reset

Description

7

DIS

R/W

1

Active Discharge of LX when regulator is disabled. Discharging LX

will discharge COUT through the inductor.

0 = VOUT is high impedance when disabled.

1 = VOUT is discharged through an internal pull-down resistor

when disabled.

6:4

SLEW[2:0]

R/W

000

Slew Rate Control for soft-start and DVS ramp-up/down rates.

Works in conjunction with the RANGE bit.

RANGE

bit

SLEW

bits

Soft-Start

DVS

fSTEP

0

000

1.5625mV/µs

3.125mV/µs

500kHz

0

001

3.125mV/µs

3.125mV/µs

500kHz

0

010

3.125mV/µs

6.25mV/µs

1MHz

0

011

6.25mV/µs

6.25mV/µs

1MHz

0

100

6.25mV/µs

12.5mV/µs

2MHz

0

101

12.5mV/µs

12.5mV/µs

2MHz

0

110

12.5mV/µs

25mV/µs

4MHz

0

111

25mV/µs

25mV/µs

4MHz

1

000

1.875mV/µs

3.75mV/µs

250kHz

1

001

3.75mV/µs

3.75mV/µs

250kHz

1

010

3.75mV/µs

7.5mV/µs

500kHz

1

011

7.5mV/µs

7.5mV/µs

500kHz

1

100

7.5mV/µs

15mV/µs

1MHz

1

101

15mV/µs

15mV/µs

1MHz

1

110

15mV/µs

25mV/µs

2MHz

1

111

30mV/µs

25mV/µs

2MHz