ne57607edh NXP Semiconductors, ne57607edh Datasheet - Page 7

• Manufacturer Part Number: ne57607edh
• Description: Two-cell Lithium-ion Battery Protection With Overcurrent, Over- And Under-voltage Protection
• Manufacturer: NXP Semiconductors

Philips Semiconductors
APPLICATION INFORMATION
The NE57607 drives the series N-Channel MOSFETs to states
determined by each of the cell’s voltage and the battery pack load
current. During normal periods of operation, both the discharge and
charge MOSFETs are in the ON state, thus allowing bidirectional
current flow.
If the battery pack is being charged, and either of the cell’s voltage
exceeds the overvoltage threshold, then the charge MOSFET is
turned OFF (FET towards the pack’s external terminal). The cell’s
voltage must fall lower than the overvoltage hysteresis voltage
(V
If the battery pack is being discharged and the undervoltage
threshold (V
turned OFF. It will not run back ON until a charger is applied to the
pack’s external terminals AND the cell’s voltage rises above the
undervoltage hysteresis voltage (V
When the battery pack is being discharged, the load current causes
the voltage across the discharge MOSFET to increase past the
overcurrent threshold voltage (V
is turned OFF after a fixed 7–18 ms delay. If short-circuit is placed
across the pack’s terminals, then the discharge MOSFET is turned
OFF after a 100–300 s time delay to avoid damaging the MOSFETs.
2001 Oct 03
OV(Hyst)
Two-cell Lithium-ion battery protection with
overcurrent, over- and under-voltage protection
Li-ION CELL
Li-ION CELL
) before the charge MOSFET is again turned ON.
UV(Th)
) is exceeded, then the discharge MOSFET is
1 k
0.1 F
OC(Th)
UV(Hyst)
0.1 F
330
), then the discharge MOSFET
).
330
0.1 F
Figure 6. Typical application circuit
6
8
4
2
NE57607
7
47 k
7
FET STATUS FOR NORMAL AND ABNORMAL
CONDITIONS
Normal mode:
Overcharge mode:
Overdischarge mode:
Overcurrent mode:
3
Normal (charging or discharging)
Overcharge (charging)
Overcharge (discharging)
Overdischarge (discharging)
Overdischarge (charging)
Overcurrent (charging or discharging)
5
Overdischarge detection voltage < battery voltage <overcharge
detection voltage
Discharge current < overcurrent detection level
Battery voltage > overcharge detection voltage
Overdischarge detection voltage > battery voltage
Discharge current > overcurrent detection level
voltage between VM and GND = discharge current
resistance (discharge or charge FET)
Operating Mode and Charging
1
Condition
1 M
10 k
10 k
+
–
CHARGER
LOAD
FET (CF)
OR
Charge
SL01567
OFF
OFF
OFF
ON
ON
ON
NE57607
Product data
Discharge
FET ON
FET (DF)
OFF
OFF
ON
ON
ON
ON