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参数资料
| 型号： | DC1621A |
| 厂商： | Linear Technology |
| 文件页数： | 12/24页 |
| 文件大小： | 0K |
| 描述： | BOARD DEMO LTM8062 |
| 设计资源： | DC1621A Design Files |
| 标准包装： | 1 |
| 系列： | LTM®, uModule® |
| 主要目的： | 电源管理，电池充电器 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | LTM8062 |
| 主要属性： | 2 芯锂离子电池 / 锂聚合物，7.2V 2A 输出 |
| 次要属性： | 9.75V ~ 32V 输入 |
| 已供物品： | 板 |
| 相关产品： | LTM8062EV#PBF-ND - IC BATTERY CHARGER TRACK 77-LGA LTM8062IV#PBF-ND - IC BATTERY CHARGER TRACK 77-LGA |
LTM8062/LTM8062A
APPLICATIONS INFORMATION
R IN =
100V IN – 270
will collapse. A minimum operating supply voltage can
thus be programmed by monitoring the supply through
a resistor divider, such that the desired minimum voltage
corresponds to 2.7V at the V INREG pin. The LTM8062/
LTM8062A servo the maximum output charge current to
maintain the voltage on V INREG at or above 2.7V.
Programming of the desired minimum voltage is accom-
plished by connecting a resistor as shown in Figure 3.
k
2.7
physically located far from the battery and the added line
impedance may interfere with the control loop. Case 2:
the battery ESR is very small or very large; the LTM8062/
LTM8062A controller is designed for a wide range, but some
battery packs have an ESR outside of this range. Case?3:
there is no battery at all. As the charger is designed to
work with the ESR of the battery, the output may oscillate
if no battery is present.
The optimum ESR is about 100m?, but ESR values both
higher and lower will work. Table 2 shows a sample of
parts successfully tested by Linear Technology:
If the voltage regulation feature is not used, connect the
V INREG pin to V IN .
Table 2
PART NUMBER
16TQC22M
DESCRIPTION
22μF, 16V, POSCAP
MANUFACTURER
Sanyo
INPUT SUPPLY
R IN
V IN
LTM8062
35SVPD18M
TPSD226M025R0100
T495D226K025AS
18μF, 35V, OS-CON
22μF, 25V Tantalum
22μF, 25V, Tantalum
Sanyo
AVX
Kemet
V INREG
8062 F03
TPSC686M006R0150
TPSB476M006R0250
68μF, 6V, Tantalum
47μF, 6V, Tantalum
AVX
AVX
Figure 3. Resistive Divider Sets Minimum V IN
BIAS Pin Considerations
The BIAS pin is used to provide drive power for the in-
ternal power switching stage and operate other internal
circuitry. For proper operation, it must be powered by at
least 2.8V and no more than the absolute maximum rat-
ing of 10V. In most applications, connect BIAS to BAT. If
there is no BIAS supply available or the battery voltage is
below 2.8V, the internal switch requires more headroom
from V IN for proper operation. Please refer to the Typical
Performance Characteristics curves for minimum start and
running requirements under various battery conditions.
When charging a 2-cell battery using a relatively high
input voltage, the LTM8062/LTM8062A power dissipation
can be reduced by connecting BIAS to a voltage between
2.8V and 3.3V.
Output Capacitance
In many applications, the internal BAT capacitance of the
LTM8062/LTM8062A is sufficient for proper operation.
There are cases, however, where it may be necessary to
add capacitance or otherwise modify the output imped-
ance of the LTM8062/LTM8062A. Case 1: the μModule is
APXE100ARA680ME61G 68μF, 10V Aluminum Nippon Chemicon
APS-150ELL680MHB5S 68μF, 25V Aluminum Nippon Chemicon
If system constraints preclude the use of electrolytic ca-
pacitors, a series R-C network may be used. Use a ceramic
capacitor of at least 22μF and an equivalent resistance of
100m?. An example of this is shown in the Typical Ap-
plications section.
MPPT Temperature Compensation
A typical solar panel is comprised of a number of series-
connected cells, each cell being a forward-biased p-n junc-
tion. As such, the open-circuit voltage (V OC ) of a solar cell
has a temperature coefficient that is similar to a common
p-n diode, or about –2mV/°C. The peak power point voltage
(V MP ) for a crystalline solar panel can be approximated as
a fixed voltage below V OC , so the temperature coefficient
for the peak power point is similar to that of V OC .
Panel manufacturers typically specify the 25°C values for
V OC , V MP , and the temperature coefficient for V OC , making
determination of the temperature coefficient for V MP of a
typical panel straight forward. The LTM8062/LTM8062A
employs a feedback network to program the V IN input
regulation voltage. Manipulation of the network makes for
8062fd
12
For more information www.linear.com/LTM8062
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