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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)： | 7/21頁 |
| 文件大小： | 833K |
| 代理商： | LM3655TLX |
13.0 Safety Functions (Continued)
13.2 SCHOTTKY ELIMINATION MODE (CHARGER INPUT SHORT CIRCUIT/REVERSE CURRENT PROTECTION)
In the case that the external input is shorted during charge, the initial state of M5 will be conducting, and reverse current will begin
to flow through M5 (draining the battery). To prevent the need for an additional external schottky blocking diode, the IC will sense
reverse current flow through M5 and turn the device off.
13.3 REVERSE CHARGER PROTECTION
The IC will protect against a reverse charger by sensing the charging power supply input voltage at VIN terminal below V
REVERSE
for
τ
REVERSE. Initially, Q1 is disabled to protect the phone and battery. Additional reverse charger protection exists in case the
Pass Transistor Q1 cannot be turned off. The IC will activate the M3 crowbar operation and turn off pass device M5. This clamps
the input from going negative without shunting the cell voltage.
These specs apply to the entire Normal Temperature Range
Specification
Test Conditions
Min
Typ
Max
Units
Reverse Charger Voltage “V
REVERSE”atVIN Pin
V
CELL > VSUV
0
0.5
1.0
V
Reverse Charger Crowbar Duty Cycle (% of time spent in
Crowbar during Reverse Charge Pulsing mode)
V
CELL = 3.6V
I
VIN = 100 mA
75
%
Reverse Charger Delay “
τ
REVERSE” following application of the
reversed voltage prior to the first Crowbar event
V
IN = 1.0V
0.01
-
7
ms
Fault conditions at V
IN could occur in either polarity. The reverse charger detection circuitry will sense the occurrence of VIN
< 0.5V and activate full conduction of M3 (called crowbar mode) after a time delay,
τ
REVERSE. This clamping action prevents the
potential for damage to the IC. Continuous reverse energy will result in a pulsating activation of crowbar.
13.4 OUTPUT CURRENT OVERLOAD PROTECTION (“PTC” MODE)
The power PMOS device M4 operates as a switch/pass element for controlling the discharge current of the cell while the PMOS
device M5 is off.
In “PTC Mode”, the LM3655 emulates a Positive Temperature Coefficient device such as a polymeric resetable fuse. During
discharge the current is flowing out from the cell through the PMOS M4 to the load. The circuit will regulate the current below I
REG
while the junction temperature of the IC is monitored in discharge. As long as the current is less than I
REG and the junction
temperature does not exceed T
PTC, the circuit will deliver the current with no interruption. If the junction temperature exceeds
T
PTC, the current regulation activate, causing the current to continuously decrease as the temperature continues to increase.
Once T
PTC is exceeded, this circuit will effectively latch a thermostatic control system that reduces the discharge current to a level
that limits the power dissipation on the IC. During discharge mode, almost all of the heat generated in the IC will be due to the
PMOS M4. Once this mode is activated, the regulation current is reduced to several hundred mA and will only recover from this
mode of operation when the cell’s load current reduces to a level that allows the die temperature to decrease.
These specs apply to the entire Normal Temperature Range.
Specification
Test Conditions
Min
Typ
Max
Units
Maximum Regulated Discharge Current “I
REG”VCELL = 3.6V
2.5
4
6.5
A
Thermostatic Junction Temperature of M4 “T
PTC- M4”
Cell Charging
RADIO B+ = 3.5V
V
CELL = 4.0V
90
105
125
C
Thermostatic Junction Temperature of M5 “T
PTC- M5”
Cell Charging, V
CELL = 3.6V
90
105
125
C
(T
CB –TPTC M4)
Delta between T
CB &TPTC M4
10
-
30
C
(T
CB –TPTC M5)
Delta between T
CB &TPTC M5
10
-
30
C
13.5 OUTPUT SHORT CIRCUIT CURRENT PROTECTION
In an event that the RADIO B+ terminal becomes shorted to ground, the IC will interrupt the short circuit current exceeding
I
SHUTOFF by turning off M4 PMOS immediately for a period of tSHUTOFF. After this period the regulation circuit will slew the M4
PMOS back to the regulation current. If the short circuit current still persists and the junction temperature exceeds T
PTC, the IC
will initiate the PTC operation to reduce the current. Figure 6 shows an example of a short circuit protection waveform.
LM3655
www.national.com
15
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