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参数资料
| 型号： | LTC4010CFE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 16/24页 |
| 文件大小： | 0K |
| 描述： | IC CHARGER NIMH/NICD 16-TSSOP |
| 标准包装： | 95 |
| 功能： | 充电管理 |
| 电池化学： | 镍镉（NiCd）、镍金属氢化物（NiMH） |
| 电源电压： | 4.5 V ~ 34 V |
| 工作温度： | 0°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 供应商设备封装： | 16-TSSOP-EP |
| 包装： | 管件 |
LTC4010
APPLICATIONS INFORMATION
V CDIV
V CELL
formedbyC1andtheparallelcombinationofR1andR2
is recommended for rejecting PWM switching noise. The
value of C1 should be chosen to yield a 1st order lowpass
frequency of less than 500Hz. In the case of a single cell,
the external application circuit shown in Figure 4 is rec-
ommended to provide the necessary noise filtering and
missing battery detection.
External Thermistor
The network for proper temperature sensing using a
thermistor with a negative temperature coefficient (NTC) is
shown in Figure 5. The LTC4010 is designed to work best
with a 1% 10k NTC thermistor with a B of 3750. However,
the LTC4010 will operate satisfactorily with other 10k NTC
thermistors having slightly different nominal exponential
temperature coefficients. For these thermistors, the tem-
perature related limits given in the Electrical Characteristics
table may not strictly apply. The filter formed by C1 in
Figure 5 is optional but recommended for rejecting PWM
switching noise.
BAT
10 1 CELL
10k 10k
7
6
33nF
4010 F04
Figure 4. Single-Cell Monitor Network
on voltage inflection may not be adequate to protect the
battery from a severe overcharge.
INTV DD Regulator Output
If BGATE is left open, the INTV DD pin of the LTC4010 can be
used as an additional source of regulated voltage in the host
system any time READY is active. Switching loads on INTV DD
may reduce the accuracy of internal analog circuits used to
monitor and terminate fast charging. In addition, DC current
drawn from the INTV DD pin can greatly increase internal
power dissipation at elevated V CC voltages. A minimum
ceramic bypass capacitor of 0.1μF is recommended.
Calculating Average Power Dissipation
The user should ensure that the maximum rated IC junction
temperature is not exceeded under all operating conditions.
The thermal resistance of the LTC4010 package ( Q JA )
is 38°C/W, provided the exposed metal pad is properly
soldered to the PCB. The actual thermal resistance in the
application will depend on the amount of PCB copper to
which the package is soldered. Feedthrough vias directly
below the package that connect to inner copper layers
are helpful in lowering thermal resistance. The following
formula may be used to estimate the maximum average
power dissipation P D (in watts) of the LTC4010 under
normal operating conditions.
P D = V CC ( 9 mA + I DD + 615 k ( Q TGATE + Q BGATE ) )
– 3 . 85 I DD + 60 n ? CC LED ?
C1
68nF
V TEMP
R T
10k NTC
5
where:
? V – V ?
? R LED + 30 ?
2
4010 F05
Figure 5. External NTC Thermistor Network
Disabling Thermistor Functions
Temperature sensing is optional in LTC4010 applications.
For low cost systems where temperature sensing may
not be required, the V TEMP pin may simply be wired to
GND through 10k to disable temperature qualification
of all charging operations. However, this practice is not
recommended for NiMH cells charged well above or below
their 1C rate, because fast charge termination based solely
I DD = Average external INTV DD load current, if any
Q TGATE = Gate charge of external P-channel MOSFET
in coulombs
Q BGATE = Gate charge of external N-channel MOSFET
(if used) in coulombs
V LED = Maximum external LED forward voltage
R LED = External LED current-limiting resistor used in
the application
n = Number of LEDs driven by the LTC4010
4010fb
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