SGM41280A Wide Input Range Boost Converter with Bypass Switch
The SGM41280A has two main bypass modes (active and passive) to directly connect the load to the V-IN source.In the active bypass mode,the direct connection is made through a supplementary bypass switch when V-IN is above the programmed V-OUT, otherwise a boost converter regulates the load voltage rail at the programmed value.The low input voltage may occur due to the increased load current or battery low charge state.When the input voltage is high,the boost converter is turned off and the input is directly bypassed to the output by the bypass switch, resulting in a very small drop between input and output.In the passive bypass mode, only the top switch of the boost converter is kept on providing the bypass route along with the series input inductor.In this mode,the path resistance is relatively higher, but the device consumes a very small quiescent current (I-Q). Most of the internal circuits including the boost and protection blocks are off to minimize power consumption.Therefore,in passive bypass mode, V-OUT can drop below programmed value as it follows V-IN.The SGM41280A is an enhanced version of the SGM41280,with the passive bypass mode added for improved lower loss performance.
This device can be shut down by VS pin to disconnect the output and minimize quiescent current. It is still programmable by VS pin when it is shut down and can go back to the previous bypass mode or to a new setting.
The boost runs at 2.5MHz but the frequency drops at light load when converter uses PSM for power-saving.
The SGM41280A is available in Green WLCSP-1.27×1.67-12B and TQFN-3×3-16L packages and can operate over -40°C to +85°C ambient temperature range.
●FEATURES:
■Wide Input Voltage Range from 2.0V to 4.9V
■3.85V/3.0A Continuous Output at 3.4V Input
■95% Efficiency at 2.5MHz PWM Frequency
■Simple I/O Control Interface
■Programmable Output Voltages: 3.35V/3.45V/3.63V/3.85V (Default)/4.25V
■I-Q = 10μA, R-DS(ON) = 20mΩ in Active Bypass Mode
■I-Q < 1μA, R-DS(ON) = 40mΩ in Passive Bypass Mode
■Less than 1μA Shutdown Current
■Thermal Shutdown Protection
■Valley Current Limit Protection
■Seamless Transition between Boost Mode and Active Bypass Mode
■Internal Soft-Start
■-40°C to +85°C Operating Temperature Range
■Available in Green WLCSP-1.27×1.67-12B and TQFN-3×3-16L Packages
Wide Input Range Boost Converter 、 wide input range front-end DC/DC synchronous boost converter |
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Datasheet |
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Please see the document for details |
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WLCSP-1.27×1.67-12B;TQFN-3×3-16L |
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English Chinese Chinese and English Japanese |
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JUNE 2020 |
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REV.A.1 |
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1.6 MB |
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