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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)： | 8/21頁 |
| 文件大小： | 833K |
| 代理商： | LM3655TLX |
13.0 Safety Functions (Continued)
These specs apply to the entire Normal Temperature Range.
Specification
Test Conditions
Min
Typ
Max
Units
Short Circuit Discharge Current “I
SHUTOFF-THRESH”
The voltage here divided by M4 resistance = I
SHUTOFF.
V
CELL = 3.6V
Voltage across M4
20C to +70C
20C to +125C
425
350
1000
mV
Short Circuit Discharge Current Recovery “
τ
SHUTOFF”IRADIO_B+ =ISHUTOFF
0.01
10
ms
I
SHUTOFF-THRESH refers to a voltage threshold between the Cell pins and the Radio B+ pins. When the voltage between these pins
exceeds this voltage threshold, M4 is to open. This circuit reacts very quickly as it is intended to be immediate. This voltage
threshold is then referred to current by dividing it by the resistance of M4 (the resistance between the Cell and Radio B+ pins).
For example the threshold current (I
SHUTOFF) is 7 amps for a threshold voltage of 700 mV and a resistance of 100 m
.Itis
specified in this manner to reflect the circuit implementation.
If the short circuit current is less than the lower limit, there will be no interruption of I
RADIOB+ short-circuit current. IREG will reduce
I
RADIOB+ to 4A in approximately 400 s. If the current is greater than the upper limit, the short-circuit event will be guaranteed to
activate I
SC. The sequence is: PMOS M4 is turned off for
τ
SHUTOFF and allowed to turn on with the current regulating loop limiting
current to 4 Amps in 400 s. Very large currents and associated energy are avoided for this 400 s settling period.
20111509
FIGURE 6. Short-Circuit Protection Waveform
LM3655
www.national.com
16
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