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參數(shù)資料
| 型號： | LM3655TLX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, BGA25 |
| 封裝： | 2.5 X 2.5 MM, MICRO SMD, 25 PIN |
| 文件頁數(shù)： | 21/21頁 |
| 文件大?。?/td> | 833K |
| 代理商： | LM3655TLX |
11.0 Charge Control Functions (Continued)
In region 1 the cell voltage is below V
TERMX and the charge current is in full-rate, the charging will continue in full-rate after the
test pulse. At the end of region 1 when the cell voltage reaches V
TERMX, the charge current now drops to trickle current and the
cell voltage drops slightly due to the IR drop of the cell internal impedance. The trickle current will continue in region 2 until the
next test pulse arrives in region 3, the internal circuit will delay the test pulse for
τ
TEST_DELAY while resetting the charge current
to zero. After the delay the current will then ramp back to full-rate and the cell voltage will charge back to V
TERMX. The test pulse
stays high for at least
τ
TEST_WIDTH and then reset to off as seen in region 4. In this region the charge current drops to trickle
current as the cell voltage also drops slightly. In regions 5, 6, and 7, the circuit continues charging the cell while cell voltage
gradually tapers to V
TERMX and the height of pulse current is gradually getting smaller. In regions 8 and 9 the cell voltage reaches
V
TERMX before the next pulse arrives, the trickle charge current will begin to reduce to less than ITRICKLE-MAX. The current will
continue to reduce in region 10 and so on until the current goes to zero. The cell voltage will be at the maximum charge capacity
voltage of V
TERMX. The charge profile will be different for different types of power supplies and discharge currents.
Specification
Test Conditions
Min
Typ
Max
Units
Pulse width of Voltage Regulator Reset
“
τ
TEST_DELAY”
0.7
1.0
1.3
ms
Fast Charging Pulse Width “
τ
TEST_WIDTH”
180
256
332
ms
Fast Charging Pulse Period “
τ
TEST_PERIOD”
Falling edge of previous pulse to rising edge
of next pulse
44
64
84
Sec
11.2.4 Low Cell Voltage Charging (Pre-Charging)
When the cell is very deeply discharged, the IC’s normal cell voltage rail may be too low for proper operation. When connected
to a power supply, if full-rate charge were immediately entered, the external supply voltage would collapse to the (very low) cell
voltage level once the power supply’s current limit has been reached.
To avoid this situation, and also to protect a deeply-discharged cell from potential damage by fast-charging too rapidly, a reduced
current charge is applied to the cell until it reaches a minimum “safe” operating level, V
PHONE_ON.
The current the IC draws from the cell to operate its internal circuitry when the charge power supply is detected is I
Q_CHRG.
When the cell voltage is less than the Phone On Voltage Threshold, 3.00V, and above the Secondary Under-voltage threshold,
1.98V, the cell will be charged at a low charge current. In this mode, the power dissipation management circuit is active thus Q1
will not be over-dissipated. Burp mode is not active in this voltage range.
A special charge circuit is provided that operates for cell voltages between 0V and 1.98V. This circuit is active only if a charger
is applied and the cell is in this voltage range. The charge current is limited to 70 mA maximum in this mode in order to limit the
power dissipation of Q1 and M5 to 800 mW for power supply voltages of 18V or less. Once the cell increases to 1.98V, the sub-2V
charging deactivates and the conventional charger takes over. A diode path from the V
DETECT pin to the CELL + pin allows for a
trickle charge current (limited by R4A and R4B ) for deeply charged cells (<0.7V).
20111506
FIGURE 3. Li-ion Charge Profile
LM3655
www.national.com
9
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