RT4805AWSC datasheet(17/22 Pages) RICHTEK

17 / 22 page

RT4805A

is a registered trademark of Richtek Technology Corporation.

DS4805A-02

April

2017

www.richtek.com

Name

Function

Addr

CONFIG

MODE control &

Spread modulation

control

0x01

Bit

Mode

name

Reset

Description

R/W

RESET

0 : Disable ID detection function

1 : Enable ID detection function

[6 : 5]

R/W

ENABLE[1 : 0]

00 : Device operation follows hardware control signal

(refer to table 1)

01 : Device operation in auto transition mode (boost/bypass)

regardless of the

nBYP control signal (EN = 1)

10 : Device is forced in pass-through mode regardless of the nBYP

control signal (EN = 1)

11 : Device is in shutdown mode. The output voltage is reduced to a

minimum value (VIN  VOUT  3.6V) regardless of the nBYP

control signal (EN = 1)

R/W

Reserved

R/W

PG Config.

0 : PG pin = H, it is not allowed.

PG pin = L, it is shut down.

1 : PG pin is for power good indication.

R/W

SSFM

0 : Spread spectrum modulation is disabled.

1 : Spread spectrum modulation is enabled in PWM mode.

[1 : 0]

R/W

MODE_CTRL[1 : 0]

00 : Not allowed.

01 : PFM with automatic transition into PWM operation.

10 : Forced PWM operation.

11 : PFM with automatic transition into PWM operation (VSEL = L),

forced PWM operation (VSEL = H).

Name

Function

Addr

VOUTFLOOR

Output Voltage

Selection

0x02

Bit

Mode

name

Reset

Description

[7 : 5]

R/W

Reserved

000

[4 : 0]

R/W

VOUT[4 : 0]

01111

00000 : VOUT = 2.85V

00001 : VOUT = 2.9V

00010 : VOUT = 2.95V

00011 : VOUT = 3V

00100 : VOUT = 3.05V

…

01111 : VOUT = 3.6V (default)

…

11111 : VOUT = 4.4V

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