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ManualsBrandsMAXIM INTEGRATED ManualsPMICsPMIC - battery management Charge management Li-Ion QSOP 28 Surface-mount
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Stand-Alone Switch-Mode
Lithium-Ion Battery-Charger Controller
current regulation, the input source must be able to
supply the maximum system current plus the maximum
charger input current. By using the input current limiter,
the current capability of the AC wall adapter may be
lowered, reducing system cost.
Input current is measured through an external sense
resistor at CSSP and CSSN. The voltage at ISETIN also
adjusts the input current limit. Full-scale input current is
achieved when ISETIN is connected to REF, setting the
full-scale current-sense voltage to 100mV.
When choosing the input current-sense resistor, note
that the voltage drop across this resistor adds to the
power loss, reducing efficiency. Reducing the voltage
across the current-sense resistor may degrade input
current limit accuracy due to the input offset of the
input current-sense amplifier.
The input current error amplifier (GMS) is compensated
at CCS. A 47nF capacitor at CCS provides suitable per-
formance for most applications.
PWM Controller
The PWM controller drives the external MOSFETs to
control the charging current or voltage. The input to the
PWM controller is the lowest of CCI, CCV, or CCS. An
internal clamp limits the noncontrolling signals to within
200mV of the controlling signal to prevent delay when
switching between regulation loops.
SHUTDOWN
FASTCHG = HIGH
FULLCHG = HIGH
FAULT = HIGH
RESET
FASTCHG = HIGH
FULLCHG = HIGH
FAULT = HIGH
PREQUAL
FASTCHG = LOW
FULLCHG = HIGH
FAULT = HIGH
FAULT
FASTCHG = HIGH
FULLCHG = HIGH
FAULT = LOW
FAST CHARGE
FASTCHG = LOW
FULLCHG = HIGH
FAULT = HIGH
FULL CHARGE
FASTCHG = HIGH
FULLCHG = LOW
FAULT = HIGH
DONE
FASTCHG = HIGH
FULLCHG = HIGH
FAULT = HIGH
TOP-OFF
FASTCHG = HIGH
FULLCHG = HIGH
FAULT = HIGH
TEMP
OK
TEMP
OK
TEMP
OK
TEMP
OK
TEMP
NOT OK
TOP-OFF
TIMEOUT
I
CHARGE
< I
MIN
OR
FULL-CHARGE
TIMEOUT
ONCE PER
SECOND
ONCE PER
SECOND
TEMP
QUAL
V
BATT
> 2.5V
V
BATT
< 0.95 × V
BATTR
V
BATT
< 0.95 × V
BATTR
V
DCIN
< BATT
V
BATT
< UNDERVOLTAGE
THRESHOLD
V
BATT
= BATTERY
REGULATION VOLTAGE (V
BATTR
)
FAST-CHARGE
TIMEOUT
PREQUAL
TIMEOUT
TEMP
NOT OK
TEMP
NOT OK
SHUTDOWN IS
ENTERED FROM ALL STATES
WHEN SHDN IS LOW.
SHDN HIGH
V
DCIN
> V
BATT
Figure 4. State Diagram
12
Maxim Integrated