1 OVERVIEW
The RK808 isa complete power supply solution for Portable systems. The highly integrateddevice includes four buck DC-DC converters, eight high performanceldos, two low Rdsswitches, I2Cinterface, programmable power sequencing and an RTC.The RK808improves performance, reduces component count and size, andtherefore provideslower cost solution compared to conventional portable designs. Theultra fast 2MHz currentmode DC/DC architecture optimizes the transient performance and is compatiblewith tiny low cost ceramic inductors and capacitors. All DC/DCchannels includeintegrated MOSFETS. Internal soft-start and compensation circuitsminimize externalcomponents count. Most outputs can be programmed through theI2Cinterface。
2 FEATURES
Inputvoltage range: 2.7V to 5.5V
2MHzSwitching Frequency for bucks
Current modearchitecture for best transient performance
Internalcompensation and soft start
I2CProgrammable output levels and powersequencing
Highefficiency architecture
IntegratedVout Discharge Circuit for BUCK and LDO
Power:•CH1:Synchronous Buck regulator, 5A max •CH2:Synchronous Buck regulator, 5A max •CH3:Synchronous Buck regulator, 3A max •CH4:Synchronous Buck regulator, 2.5A max •CH6,CH7,CH9,CH11:Linear regulators, 150mA max •CH8: Lownoise and high PSRR linear regulator,100mA max •CH10,CH12,CH13:Linear regulators, 300mA max •CH14: LowRds switch, 0.2ohm@Vgs=3v •CH15: LowRds switch, 0.2ohm@Vgs=3v
Auxiliary:Flexible Power Sequence control
Package:7mmx7mm QFN68
