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| 型号： | LTC4160EUDC#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 23/32页 |
| 文件大小： | 0K |
| 描述： | IC SWITCH POWER MANAGER 20-QFN |
| 标准包装： | 91 |
| 系列： | Bat-Track™, PowerPath™ |
| 功能： | 电源管理 |
| 电池化学： | 锂离子（Li-Ion）、锂聚合物（Li-Pol） |
| 电源电压： | 4.35 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-WFQFN 裸露焊盘 |
| 供应商设备封装： | 20-QFN（3x4） |
| 包装： | 管件 |
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LTC4160/LTC4160-1
APPLICATIONS INFORMATION
R PROG ≤
currentthanisavailablewillnotcausetheaverageinput
current limit to be violated. It will merely allow the battery
charger to make use of all available power to charge the
battery as quickly as possible, and with minimal dissipa-
tion within the charger.
Battery Charger Stability Considerations
The LTC4160/LTC4160-1’s battery charger contains both a
constant-voltage and a constant-current control loop. The
constant-voltage loop is stable without any compensation
when a battery is connected with low impedance leads.
Excessive lead length, however, may add enough series
inductance to require a bypass capacitor of at least 1μF
from BAT to GND.
High value, low ESR MLCCs reduce the constant-voltage
loop phase margin, possibly resulting in instability. Up
to 22μF may be used in parallel with a battery, but larger
capacitors should be decoupled with 0.2? to 1? of series
resistance.
Furthermore, a 100μF capacitor in series with a 0.3? re-
sistor from BAT to GND is required to prevent oscillation
when the battery is disconnected.
In constant-current mode, the PROG pin is in the feed-
back loop rather than the battery voltage. Because of the
additional pole created by any PROG pin capacitance,
capacitance on this pin must be kept to a minimum. With
no additional capacitance on the PROG pin, the charger
is stable with program resistor values as high as 25k.
However, additional capacitance on this node reduces the
maximum allowed program resistor. The pole frequency at
the PROG pin should be kept above 100kHz. Therefore, if
the PROG pin has a parasitic capacitance, C PROG , the fol-
lowing equation should be used to calculate the maximum
resistance value for R PROG :
1
2 π ? 100 kHz ? C PROG
Alternate NTC Thermistors and Biasing
The LTC4160/LTC4160-1 provide temperature qualified
charging if a grounded thermistor and a bias resistor
are connected to NTC. By using a bias resistor whose
value is equal to the room temperature resistance of the
thermistor (R25) the upper and lower temperatures are
pre-programmed to approximately 40°C and 0°C respec-
tively assuming a Vishay Curve 1 thermistor.
The upper and lower temperature thresholds can be ad-
justed by either a modification of the bias resistor value
or by adding a second adjustment resistor to the circuit.
If only the bias resistor is adjusted, then either the upper
or the lower threshold can be modified but not both. The
other trip point will be determined by the characteristics
of the thermistor. Using the bias resistor in addition to an
adjustment resistor, both the upper and the lower tempera-
ture trip points can be independently programmed with
the constraint that the difference between the upper and
lower temperature thresholds cannot decrease. Examples
of each technique are given below.
NTC thermistors have temperature characteristics which
are indicated on resistance-temperature conversion tables.
The Vishay-Dale thermistor NTHS0603N011-N1003F, used
in the following examples, has a nominal value of 100k
and follows the Vishay Curve 1 resistance-temperature
characteristic.
In the explanation below, the following notation is used.
R25 = Value of the thermistor at 25°C
R NTC|COLD = Value of the thermistor at the cold
trip point
R NTC|HOT = Value of the thermistor at the hot
trip point
r COLD = Ratio of R NTC|COLD to R25
r HOT = Ratio of R NTC|HOT to R25
R NOM – Primary thermistor bias resistor
(see Figure 7)
R1 = Optional temperature range adjustment resistor
(see Figure 8)
The trip points for the LTC4160/LTC4160-1’s temperature
qualification are internally programmed at 0.349 ? NTCBIAS
for the hot threshold and 0.765 ? NTCBIAS for the cold
threshold.
41601fa
23
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