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Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
3. Technical Brief
3.12.3. Charging control
A programmable charging block in PM7540 is used for battery charging. It is possible to set limits for the charging
current. The external supply typically connects directly to pin (VCHG). The voltage on this pin (VCHG) is monitored
by detection circuitry to ascertain whether a valid external supply is applied or not. For additional accuracy or to
capture variations over time, this voltage is routed internally to the housekeeping ADC via the analog multiplexer.
PM7540 circuits monitor voltages at VCHARGER and ICHARGE pins to determine which supply should be used and
when to switch between the two supplies. These pins are connected to the Source (or emitter) and Drain (or
collector) contacts of the pass transistor respectively.
U8210 Charging Control block
PM7540
Input Power
Management
NUS5530
PM7540 only include charging controller.
So it is necessary external charging path TR.
This is NUS5530.
This part also include battery side power path.
NUS5530
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