RT5035A/B
7+3 Channel DC-DC Converters with RTC and I
2
C Interface
General Description
RT5035A/B is a highly-integrated DSC Power
Management IC that contains 7ch switching DC-DC
converters and two generic LDOs, one keep-alive
low-quiescent LDO for RTC, one load switch with
soft-start control and current limit, a switch with reverse
leakage prevention for backup battery, and a
Real-Time-Clock (RTC) including time counter and
32768Hz oscillator. The DC-DC converters are one
low-voltage Step-Up operated in either Async-PFM or
Sync-PWM, one current mode Sync Step-Up/Down
(Buck-Boost), four Sync Step-Down, and one Asyn
Step-Up for WLED driver. All power MOS are
integrated. And compensation networks are built in.
RT5035A/B uses I
2
C interface to set power-on and
power-off timing, output voltage, and WLED current
and dimming level, and also access RTC time counters
and oscillator fine-tuning. RT5035A/B dedicate for
CMOS image sensor application by providing one Sync
Step-Down, one LDO, and one load switch. The
RT5035A/B also provides rich protection functions
include Over-Current Protection, Under-Voltage
Protection,
Over-Voltage
Protection,
Over-
Temperature Protection, and Over-Load Protection.
RT5035A/B is available in WQFN-40L 5x5 package.
Features
CH1 Sync Step-Up in PWM Mode or Async
Step-Up in Pulse Frequency Mode
CH2 Current Mode Sync Step-Up/Down
CH3/CH4/CH5 Current Mode Sync Step-Down
SW4 Load Switch with Soft-Start Inrush Control
And Current Limit
CH6 Generic Low Voltage LDO for CMOS Sensor
CH7 WLED Driver in Async Step-Up Mode
Open LED Protection
32 Dimming Levels
CH8 Generic Low Voltage LDO for Multiple
Purpose Power Supply
CH9 Keep-Alive Low-Quiescent LDO
CH10 Sync Step-Down or Async Step-down in
Pulse Frequency Mode for Memory Standby
Mode Application
LV Sync Step-Down DC-DC Converter High
Efficiency Up to 95%
100% (Max) Duty Cycle for CH3, CH4, CH5 &CH10
I
2
C Control Interface to Program Enable, Power
On/Off Delay Time, Output Regulated Voltage,
WLED Dimming Current
RTC Timer And Oscillator
Fixed 2MHz Switching Frequency for CH1, CH3,
CH4, CH5, CH10
Fixed 1MHz Switching Frequency for CH2, CH7
Applications
Digital Cameras
Portable Instruments
Simplified Application Circuit
RT5035A/B
BAT
VOUT1
VOUT2
VDDM
VOUT3
VOUT4
SWO
I C Control
2
Step-Up for Motor
Step-Up/Down for I/O
Step-Down for Core
Step-Down for CMOS
Load Switch for CMOS
Step-Down for CMOS
LDO for CMOS
Step-Up for LED Backlight
LDO for HDMI
LDO for RTC
Step-Down for Memory
SCL
SDA
C32K
EN
SYNC
RESET
VOUT5
VOUT6
LX7
VOUT8
RTCPWR
VOUT10
GND
Copyright © 2020 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS5035A/B-03
February 2020
www.richtek.com
1
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
