SLWSTK6000A Datasheet, PDF (11/80 Pages) Silicon Laboratories – ConfidentialMighty Gecko Wireless SoC EFR32MG1X232

EFR32MG1X232 Data Sheet
System Overview
3.3.37 Integrated DC-DC Converter (DC-DC)
Confidential ^{The DC-DC buck converter covers a wide range of load currents and provides high efficiency in energy modes EM0, EM1, EM2 and}
EM3. Patent-pending RF noise mitigation allows operation of the DC-DC converter without degrading radio sensitivity. The converter
has three modes: low noise (LN), low power (LP), and bypass. Each operating mode transition is initiated by firmware and executed by
an integrated hardware state machine, providing well-controlled transitions. Bypass mode may be entered when the input voltage is too
low for efficient operation of the DC-DC converter. In Bypass mode, the DC-DC input supply is internally connected directly to its output
through a low resistance switch. Bypass mode also supports in-rush current limiting to avoid dipping the input supply due to excessive
current transients.
Key Features:
• Wide load range from sub-µA to 200 mA
• High efficiency up to 90%
• Low Noise (LN), Low Power (LP) and Bypass operating modes for high performance and low energy applications
• Fast wakeup from LP to LN to support quick EM2 to EM0 transition
• Low 50 nA quiescent current in LP mode to support micro-ampere range load currents
• Optimized for integration with the on-board radio
• Switching frequency programmable from 3 MHz to 8 MHz
• RF noise mitigation mechanism
• Supports wide range of passive part selection
• External capacitor range from 1 µF to 10 µF with external 4.7 µH inductor
• Protection features
• Programmable sourcing and sinking current limits
• Output short-circuit protection
• Dead-time protection
DVDD
Bypass mode enable
LN mode enable
LN Controller ^PWM _SW
Logic
LP mode enable
LP Controller ^pulses
CLim
ZDet
PFET2
VREGVDD
PFET1
VREGSW
4.7uH
NFET
VREGVSS
1.0uF
Figure 3.2. Functional Diagram of the DC-DC Converter
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