详细介绍-一级代理VT5021
The VT5021 is a constant- current / constant- voltage charger circuit for single cell lithium-ion
batteries. The device includes an internal power transistor, does not need external current sense
resistor and blocking diode in applications. VT5021 requires minimal external components, and
meet the USB bus specification, is very suitable for portable applications in the field.
Thermal modulation circuit can control the chip temperature in a safe range when the device
power dissipation be relatively large or the ambient temperature be higher. Within a fixed constant
charge voltage 4.2V, can also be adjusted by an external resistor. Charge current set by an external
resistor.
When the input voltage (AC adapter or USB power supply) power is lost, VT5021 automatically
enters a low power sleep mode, then the battery current consumption is less than 3μA. Built-in
protection circuits against irrigation, when the battery voltage is higher than the input voltage,
automatically turn off built-in power MOSFET. Other features include low input voltage latch,
automatic recharge, the battery temperature monitoring and charge status / charge status indication
functions.VT5021 uses thermally enhanced 8-pin small outline package SOP-8 or MSOP-8.
batteries. The device includes an internal power transistor, does not need external current sense
resistor and blocking diode in applications. VT5021 requires minimal external components, and
meet the USB bus specification, is very suitable for portable applications in the field.
Thermal modulation circuit can control the chip temperature in a safe range when the device
power dissipation be relatively large or the ambient temperature be higher. Within a fixed constant
charge voltage 4.2V, can also be adjusted by an external resistor. Charge current set by an external
resistor.
When the input voltage (AC adapter or USB power supply) power is lost, VT5021 automatically
enters a low power sleep mode, then the battery current consumption is less than 3μA. Built-in
protection circuits against irrigation, when the battery voltage is higher than the input voltage,
automatically turn off built-in power MOSFET. Other features include low input voltage latch,
automatic recharge, the battery temperature monitoring and charge status / charge status indication
functions.VT5021 uses thermally enhanced 8-pin small outline package SOP-8 or MSOP-8.