RT5028C datasheet(3/41 Pages) RICHTEK

3 / 41 page

DS5028C-03

September 2016

www.richtek.com

RT5028C

is a registered trademark of Richtek Technology Corporation.

Pin No.

Pin Name

Pin Function

SDA

Data input for I2C. Open-drain output, connect a 10k

Ω pull-up resistor.

ENL7

Enable control input for LDO7. Connect a 100k

Ω pull-low resistor.

ENL8

Enable control input for LDO8. Connect a 100k

Ω pull-low resistor.

IRQ

Open-drain IRQ output node.

RESET

Reset output.

21, 34, 56, 57

(Exposed Pad)

AGND

Analog ground. The exposed pad must be soldered to a large PCB and

connected to AGND for maximum power dissipation.

PWRON

Manual power on. Connect a 100k

Ω pull-up resistor.

REBOOT

System power reboot. Connect a 100k

Ω pull-low resistor.

MTP

MTP write protection pin. Connect a 100k

Ω pull-low resistor, logic low is inhibited

and logic high is permit to write.

MASK_GPIO

Select I2C or use EN pin for Bucks and LDOs. Connect a 100k

Ω pull-low resistor.

As MASK_GPIO is high, ignore all EN pins.

As MASK_GPIO is low, EN pins and I2C both can control. EN pins priority is

higher than I2C.

PWRHOLD

Power hold input. Connect a 100k

Ω pull-low resistor.

SADDR

I2C slave address. Connect a 100k

Ω pull-low resistor.

ENB4

Enable control input for Buck4. Connect a 100k

Ω pull-low resistor.

VOUTB4S

Output voltage regulation node for Buck4.

ENB3

Enable control input for Buck3. Connect a 100k

Ω pull-low resistor.

LXB4

Internal switch node to output inductor connection for Buck4.

VINB4

Input power for Buck4.

VOUTB3S

Output voltage regulation node for Buck3.

35, 36

LXB3

Internal switch node to output inductor connection for Buck3.

37, 38

VINB3

Input power for Buck3.

VOUTB2S

Output voltage regulation node for Buck2.

ENB2

Enable control input for Buck2. Connect a 100k

Ω pull-low resistor.

41, 42

LXB2

Internal switch node to output inductor connection for Buck2.

43, 44

VINB2

Input power for Buck2.

45, 46

VINB1

Input power for Buck1.

47, 48

LXB1

Internal switch node to output inductor connection for Buck1.

ENB1

Enable control input for Buck1. Connect a 100k

Ω pull-low resistor.

VOUTB1S

Output voltage regulation node for Buck1

VDDP

Internal bias regulator voltage. External load on this pin is not allowed.

VIN

Input power for analog base.

ENL1

Enable control input for LDO1. Connect a 100k

Ω pull-low resistor.

ENL2

Enable control input for LDO2. Connect a 100k

Ω pull-low resistor.

ENL3

Enable control input for LDO3. Connect a 100k

Ω pull-low resistor.

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