参数资料
| 型号： | LTC4069EDC#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 9/18页 |
| 文件大小： | 0K |
| 描述： | IC CHARGER LI-ION 6-DFN |
| 标准包装： | 2,500 |
| 功能： | 充电管理 |
| 电池化学： | 锂离子（Li-Ion） |
| 电源电压： | 3.75 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 6-WFDFN 裸露焊盘 |
| 供应商设备封装： | 6-DFN-EP（2x2） |
| 包装： | 带卷 (TR) |
LTC4069
OPERATION
below 4.1V (which corresponds to 80% to 90% battery
capacity), a new charge cycle is initiated and a 2.25 hour
timer begins. This ensures that the battery is kept at, or
near, a fully charged condition and eliminates the need for
periodic charge cycle initiations. Also, if the battery voltage
does not exceed the recharge threshold voltage when the
timer ends, the timer resets and a 2.25 hour recharge cycle
begins. The CHRG output assumes a strong pull-down
state during recharge cycles until C/10 is reached when
it transitions to a high impendance state.
Trickle Charge and Defective Battery Detection
At the beginning of a charge cycle, if the battery voltage
is low (below 2.9V), the charger goes into trickle charge,
reducing the charge current to 10% of the full-scale current.
If the low-battery voltage persists for one quarter of the total
time (1.125 hour), the battery is assumed to be defective,
the charge cycle is terminated and the CHRG pin output
pulses at a frequency of 2Hz with a 75% duty cycle. If for
any reason the battery voltage rises above 2.9V, the charge
cycle will be restarted. To restart the charge cycle (i.e.,
when the defective battery is replaced with a discharged
battery), simply remove the input voltage and reapply it
or momentarily float the PROG pin and reconnect it.
CHRG Status Output Pin
The charge status indicator pin has three states: pull-down,
pulse at 2Hz (see Trickle Charge and Defective Battery
Detection and Battery Temperature Monitoring) and high
impedance. The pull-down state indicates that the LTC4069
is in a charge cycle. A high impedance state indicates that
the charge current has dropped below 10% of the full-scale
current or the LTC4069 is disabled. Figure 2 shows the
CHRG status under various conditions.
Charge Current Soft-Start and Soft-Stop
The LTC4069 includes a soft-start circuit to minimize
the inrush current at the start of a charge cycle. When a
charge cycle is initiated, the charge current ramps from
zero to the full-scale current over a period of approximately
170μs. Likewise, internal circuitry slowly ramps the charge
current from full-scale to zero when the charger is shut off
or self terminates. This has the effect of minimizing the
transient current load on the power supply during start-up
and charge termination.
Constant-Current/Constant-Voltage/
Constant-Temperature
The LTC4069 uses a unique architecture to charge a
battery in a constant-current, constant-voltage and con-
stant-temperature fashion. Figure 1 shows a Simplified
Block Diagram of the LTC4069. Three of the amplifier
feedback loops shown control the constant-current (CA),
constant-voltage (VA), and constant-temperature (TA)
modes. A fourth amplifier feedback loop (MA) is used to
increase the output impedance of the current source pair,
M1 and M2 (note that M1 is the internal P-channel power
MOSFET). It ensures that the drain current of M1 is exactly
1000 times greater than the drain current of M2.
Amplifiers CA and VA are used in separate feedback loops
to force the charger into constant-current or constant-volt-
age mode, respectively. Diodes D1 and D2 provide priority
to either the constant-current or constant-voltage loop,
whichever is trying to reduce the charge current the most.
The output of the other amplifier saturates low which
effectively removes its loop from the system. When in
constant-current mode, CA servos the voltage at the PROG
pin to be precisely 1V. VA servos its inverting input to an
internal reference voltage when in constant-voltage mode
and the internal resistor divider, made up of R1 and R2,
ensures that the battery voltage is maintained at 4.2V.
The PROG pin voltage gives an indication of the charge
current during constant-voltage mode as discussed in
“Programming Charge Current”.
Transconductance amplifier, TA, limits the die temperature
to approximately 115°C when in constant-temperature
mode. Diode D3 ensures that TA does not affect the charge
current when the die temperature is below approximately
115°C. The PROG pin voltage continues to give an indication
of the charge current.
9
For more information www.linear.com/LTC4069
4069fc
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