RT5035A datasheet(21/44 Pages) RICHTEK

21 / 44 page

RT5035A/B

is a registered trademark of Richtek Technology Corporation.

DS5035A/B-02

February

2017

www.richtek.com

VNEG Charge Pump

The Charge pump is to increase the Vgs driving of big

PMOS in Ch2/3/4/5/10. When BAT < 3.6V and one of

Ch2/3/4/5/10 turns on, VNEG Charge Pump would turn

on and start to pump. But when pumping, the BAT

threshold to turn off and stop charge pump becomes

3.9V. When pumping, the (BAT

 VNEG) voltage would

be clamped at 4.5V. But because of charge pumping

architecture limitation, most negative level of the VNEG

is only (

BAT). Hence, if BAT < 4.5 / 2 = 2.25V, VNEG

is limited to (

BAT). When VNEG Charge pump is off,

VNEG is connected internally to GND.

CH3 : Synchronous Step-Down DC-DC Converter

CH3 is suitable for core power in DSC system. The

converter operates in fixed frequency PWM mode with

integrated MOSFETs, FB resistors and compensation

network. The CH3 step-down converter can be

operated at 100% maximum duty cycle to extend

battery operating voltage range. The output voltage of

CH3 is adjustable by the I2C interface in the range of

1V to 1.3V. Besides, the CH3 also can be adjusted

output voltage if I2C is set to use the external resistor.

The VOUT can be calculated by the equation as below :

VOUT_CH3 = (1 + R1 / R2) x VFB3

Where VFB3 is 0.8V typically and suggested value for

R1 is 100k

 to 600k.

CH4 : Synchronous Step-Down DC-DC Converter

CH4 is suitable for digital I/O power in DSC system.

The converter operates in fixed frequency PWM mode

with integrated internal MOSFETs, FB resistors and

compensation network. The CH4 step-down converter

can be operated at 100% maximum duty cycle to

extend battery operating voltage range. The output

voltage of CH4 is adjustable by the I2C interface in the

range of 1.35V to 2.14V.

CH5 : Synchronous Step-Down DC-DC Converter

CH5 is suitable for CMOS sensor power in DSC system.

The converter operates in fixed frequency PWM mode

with integrated internal MOSFETs, FB resistors and

compensation network. The CH5 step-down converter

can be operated at 100% maximum duty cycle to

extend battery operating voltage range. The output

voltage of CH5 is adjustable by the I2C interface in the

range of 1.2V to 2V or set by external feedback

resistors, as expressed in the following equation :

VOUT_CH5 = (1 + R1 / R2) x VFB5

where VFB5 is 0.8V typically and suggested value for

R1 is 100k

 to 600k.

CH6 : Generic LDO

CH6 is a generic low voltage LDO for multiple purpose

power. The CH6 is a linear regulator, designed to be

stable over the entire operating load range with the use

of external ceramic capacitors. CH6 has an ON/OFF

control which can be set by I2C commands. The output

voltage of CH6 is adjustable by the I2C interface in the

range of 1.2V to 3V.

CH7 : WLED Driver

CH7 is a WLED driver operates at asynchronous

step-up mode with an internal MOSFET and internal

compensation. The LED current is defined by FB7

voltage and the external resistor between FB7 and

GND. The FB7 regulation voltage can be set in 32

steps from 9.2mV to 300mV, typically, via I2C interface.

The WLED current can be set by the following equation :

ILED (mA) = [0.3V / REXT] x (DIM7 + 1) / 32

Where REXT is the current sense resistor from FB7 to

GND and (DIM7 + 1) / 32 ratio refers to I2C control

The maximum ILED is defined by 0.3V / REXT.

CH8 : Generic LDO

CH8 is a generic low voltage LDO for multiple purpose

power. The CH8 is a linear regulator, designed to be

stable over the entire operating load range with the use

of external ceramic capacitors. CH8 has an ON/OFF

control which can be set by I2C commands. The output

voltage of CH8 is adjustable by the I2C interface in the

range of 1.5V to 5.2V.

RT5035A Datasheet(PDF) 21 Page - Richtek Technology Corporation

RT5035A Datasheet(HTML) 21 Page - Richtek Technology Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44

Datasheet Download

Link URL