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参数资料
| 型号： | LM3655TLX |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, BGA25 |
| 封装： | 2.5 X 2.5 MM, MICRO SMD, 25 PIN |
| 文件页数： | 19/21页 |
| 文件大小： | 833K |
| 代理商： | LM3655TLX |
11.0 Charge Control Functions (Continued)
The Shunt Regulator (Z1) on the V
DETECT pin is designed to sink a limited amount of current while maintaining certain levels of
regulation. These are specified below. When there is excessive current flowing into the V
DETECT pin above which Z1 can regulate,
then current can flow through D1 into the cell pin. When the cell pin voltage exceeds V
SHUNT,ICELL_SHUNT turns on. The
I
CELL_SHUNT circuit is implemented redundantly. ICELL_SHUNT shunts current to ground through effectively 100
when both
redundant circuits are operating.
V
DETECT circuit parametric specs are summarized below. These specs apply to the entire Normal Temperature Range.
Parameter
Description
Min
Typ
Max
Units
I
DETECTMIN1
Min V
DETECT pin current to allow detection of a charger
100
A
I
UNDETECTMAX
Maximum current into the V
DETECT pin for the charger to be not
detected.
3A
I
DETECTMIN2
Once a charger is detected, it will remain detected unless the
current into the V
DETECT pin goes below this threshold
25
A
I
CELL_SHUNT
V
CELL current.
With V
CELL = 4.5V (> VSHUNT)
20
75
mA
I
DETECTMAX
Max V
DETECT pin current that can maintain VDETECTMAX1
15
mA
V
DETECTMAX1
Normal V
DETECT regulation voltage, IDETECTMIN < IDETECT <
I
DETECTMAX
V
CELL
–5 mV
V
CELL
± 50 mV
V
DETECTMAX2
Secondary V
DETECT voltage limit, IDETECTMAX < IDETECT
< 30 mA
V
CELL 1V
V
11.2.2 Debounce Function
The charger debounce detects a temporary disconnect/connect of the charging power supply. This can occur when the end-user
inserts the power supply to the phone and the connection is not made cleanly, or if the connection is disturbed (such as dropping
the phone).
When the IC first senses the power supply input voltage it will delay
τ
DEBOUNCE_ON before the charger detect signal is confirmed.
If there is disconnect of the charge power supply, the IC will delay
τ
DEBOUNCE_OFF before the disconnection is confirmed. The IC
will ignore the interruptions of duration shorter than specified. These specs apply to the entire Normal Temperature Range.
20111505
FIGURE 2. V
DETECT Circuit
LM3655
www.national.com
7
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