RT5021
Features
Power Converter Unit
CH1 LV Sync Step-Up
Support Up to 1A Loading, DVS (Dynamic Voltage
Scaling), Load-Disconnect, Up to 95% Efficiency,
PSM/PWM Selectable
CH2 LV Sync Step-Up/Down
Support Up to 1A Loading, DVS, Up to 95%
Efficiency, PSM/PWM Selectable
CH3/4 LV Sync Step-Down
Support Up to 1.3A Loading, DVS, Up to 95%
Efficiency, 100% (MAX) Duty Cycle, PSM/PWM
Selectable
CH5 LV Sync Step-Down
Support Up to 0.6A Loading, Up to 95% Efficiency,
100% (MAX) Duty Cycle
Output Voltage can be Selected from Preset List
or Set by External Feedback Network
CH6 Low Input Power LDO
V
IN
Range 1.5V to 5.5V
Output Voltage Level Selectable in I
2
C Register
CH7 WLED Driver in Either Sync Step-Up Operation
or Current Regulator Operation
Step-Up Mode with LED Open Protection (OVP7
16V or 25V, Selectable in I
2
C Register)
Step-Up Mode Support Series 2 to 6 WLED and
Load Disconnect Function
Current Regulator Mode for 1 WLED
31 WLED Dimming Levels
Automatic Mode Selection by External Circuit
Topology
CH8 Generic LDO
V
IN
Range 1.5V to 5.5V
Output Voltage Level Selectable in I
2
C Register
CH9 Low Quiescent LDO with Reverse Leakage
Prevention for RTC Power Supply
Fixed 3.05V Output
Six Preset Power On/Off Sequences by One Pin
SEQ
SEQ # 0 : CH2
→
CH3
→
CH4
SEQ # 1 : CH1
→
CH3
→
CH2
→
CH4
SEQ # 2 : CH1
→
CH3
→
CH4
→
CH2
SEQ # 3 : CH1
→
CH2
→
CH4
→
CH3
SEQ # 4 : CH1
→
CH4
→
CH3
→
CH2
SEQ # 5 : CH1
→
CH4
→
CH2
→
CH3
All Power Switches Integrated with Internal
Compensation
Discharge Output of Every Channels when Turning
Off
Wake Up Impulse to Monitor BAT and VIN Plug-In
Fixed 2MHz Switching Frequency for CH1/3/4/5,
Fixed 1MHz Switching Frequency for CH2/7
Charger Unit
28V Maximum Rating for V
IN
Power
Selectable Power Input Current Limit (0.1A / 0.5A /
1A / 1.5A)
Auto Power Path Management (APPM) with
Integrated Power MOSFETs
Battery Charging Current Control and Regulation
Voltage Control
Programmable Charging Current and Safe Charge
Timer
Optimized Charge Rate Via Thermal Feedback
Under Voltage Protection, Over Voltage Protection
Charger Status and VIN Power GOOD Indicators
Interrupt Indicator to JEITA Temperature/Fault/
Status Events when PMU is Enabled
Battery Temperature Events
Battery Removing Event
Charger in Thermal Regulation Control
Safety Timer Timeout
End of Charging
VIN Power Good
VIN < DPM Threshold 4.35V
Charger Type Detection Finishing
Charger Type Detection
Dedicated Charger : Support Apple and Sony
Charger
Secondary Charger Detection to Distinguish CDP
and DCP
I
2
C Control Interface : Support Fast Mode up to
400kb/s
Small 40-Lead WQFN Package
RoHS Compliant and Halogen Free
Copyright
©
2013 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
2
DS5021-01 April 2013
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
