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參數(shù)資料
| 型號： | LTC4010EFE |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.2 A BATTERY CHARGE CONTROLLER, 640 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | 4.40 MM, PLASTIC, TSSOP-16 |
| 文件頁數(shù)： | 2/24頁 |
| 文件大?。?/td> | 281K |
| 代理商： | LTC4010EFE |
LTC4010
0
4010fb
Shutdown State
The LTC4010 remains in micropower shutdown until VCC
(Pin 15) is driven above BAT (Pin 10). In shutdown all
status and PWM outputs and internally generated supply
voltages are inactive. Current consumption from VCC and
BAT is reduced to a very low level.
Charge Qualification State
OnceVCCisgreaterthanBAT,theLTC4010exitsmicropower
shutdown, enables its own internal supplies and switches
VCDIV to GND to allow measurement of the average single-
cell voltage. The IC also verifies that VCCisatorabove4.2V,
VCCis510mVaboveBATandVCELLisbetween350mVand
1.95V. If VCELL is below 350mV, no charging will occur, and
if VCELL is above 1.95V, the fault state is entered, which
is described in more detail below. Once adequate voltage
conditions exist for charging, READY is asserted.
If the voltage between VTEMP and GND is below 200mV, the
LTC4010 is paused. If VTEMP is above 200mV but below
2.85V, the LTC4010 verifies that the sensed temperature
is between 5°C and 45°C. If these temperature limits
are not met or if its own die temperature is too high, the
LTC4010 will indicate a fault and not allow charging to
begin. If VTEMP is greater than 2.85V, battery temperature
related charge qualification, monitoring and termination
are disabled.
Once charging is fully qualified, precharge begins (unless
the LTC4010 is paused). In that case, the VTEMP pin is
monitoredforfurthercontrol.Thechargestatusindicators
and PWM outputs remain inactive until charging begins.
Charge Monitoring
The LTC4010 continues to monitor important voltage and
temperature parameters during all charging states. If VCC
drops to the BAT voltage or lower, charging stops and the
shutdown state is entered. If VCC drops below 4.25V or
VCELLdropsbelow350mV,chargingstopsandtheLTC4010
returns to the charge qualification state. If VCELL exceeds
1.95V, charging stops and the IC enters the fault state. If an
externalthermistorindicatessensedtemperatureisbeyond
a range of 5°C to 60°C, or the internal die temperature
exceeds a resonable value, charging is suspended, the
charge timer is paused and the LTC4010 indicates a fault
condition. Normal charging resumes from the previous
statewhenthesensedtemperaturereturnstoasatisfactory
range. In addition, other battery faults are detected during
specific charging states as described below.
Precharge State
If the initial voltage on VCELL is below 900mV, the LTC4010
enters the precharge state and enables the PWM current
source to trickle charge using one-fifth the programmed
charge current. The CHRG status output is active during
precharge. The precharge state duration is limited to
tMAX/12 minutes, where tMAX is the maximum fast charge
period programmed with the TIMER pin. If sufficient VCELL
voltage cannot be developed in this length of time, the fault
state is entered, otherwise fast charge begins.
Fast Charge State
If adequate average single-cell voltage exists, the LTC4010
enters the fast charge state and begins charging at the
programmed current set by the external current sense
resistor connected between the SENSE and BAT pins.
The CHRG status output is active during fast charge. If
VCELL is initially above 1.325V, voltage-based termination
processingbeginsimmediately.Otherwise–Vtermination
is disabled for a stabilization period of tMAX/12. In that
case, the LTC4010 makes another fault check at tMAX/12,
requiring the average cell voltage to be above 1.22V. This
ensures the battery pack is accepting a fast charge. If
VCELL is not above this voltage threshold, the fault state is
entered. Fast charge state duration is limited to tMAX and
the fault state is entered if this limit is exceeded.
operaTion (Refer to Figure 1)
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