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參數(shù)資料
| 型號(hào)： | LTM8062EV#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | BATTERY CHARGE CONTROLLER, 1150 kHz SWITCHING FREQ-MAX, PBGA77 |
| 封裝： | 15 X 9 MM, 4.32 MM HEIGHT, ROHS COMPLIANT, MO-222, LGA-77 |
| 文件頁數(shù)： | 4/24頁 |
| 文件大小： | 580K |
| 代理商： | LTM8062EV#PBF |
LTM8062/LTM8062A
12
8062fa
Figure 3. Resistive Divider Sets Minimum VIN
APPLICATIONS INFORMATION
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 VINREG pin. The LTM8062/
LTM8062A servo the maximum output charge current to
maintain the voltage on VINREG at or above 2.7V.
Programming of the desired minimum voltage is accom-
plished by connecting a resistor as shown in Figure 3.
RIN =
100VIN – 270
2.7
k
If the voltage regulation feature is not used, connect the
VINREG pin to VIN.
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/
LTM8062Acontrollerisdesignedforawiderange,butsome
battery packs have an ESR outside of this range. Case3:
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:
Table 2
PART NUMBER
DESCRIPTION
MANUFACTURER
16TQC22M
22F, 16V, POSCAP
Sanyo
35SVPD18M
18F, 35V, OS-CON
Sanyo
TPSD226M025R0100
22F, 25V Tantalum
AVX
T495D226K025AS
22F, 25V, Tantalum
Kemet
TPSC686M006R0150
68F, 6V, Tantalum
AVX
TPSB476M006R0250
47F, 6V, Tantalum
AVX
APXE100ARA680ME61G
68F, 10V Aluminum
Nippon Chemicon
APS-150ELL680MHB5S
68F, 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 22F 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-
connectedcells,eachcellbeingaforward-biasedp-njunc-
tion. As such, the open-circuit voltage (VOC) of a solar cell
has a temperature coefficient that is similar to a common
p-ndiode,orabout–2mV/°C.Thepeakpowerpointvoltage
(VMP) for a crystalline solar panel can be approximated as
a fixed voltage below VOC, so the temperature coefficient
for the peak power point is similar to that of VOC.
Panel manufacturers typically specify the 25°C values for
VOC, VMP, and the temperature coefficient for VOC, making
determination of the temperature coefficient for VMP of a
typical panel straight forward. The LTM8062/LTM8062A
employs a feedback network to program the VIN input
regulation voltage. Manipulation of the network makes for
VIN
VINREG
8062 F03
LTM8062
INPUT SUPPLY
RIN
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 VIN for proper operation. Please refer to the Typical
PerformanceCharacteristicscurvesforminimumstartand
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 Module is
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