NCP802SN1T1 ON Semiconductor, NCP802SN1T1 Datasheet - Page 17

• Manufacturer Part Number: NCP802SN1T1
• Description: IC L-I BATTERY PROTECTOR SOT23-6
• Manufacturer: ON Semiconductor
• Type: Battery Protectionr

Specifications of NCP802SN1T1

• Function: Over/Under Voltage Protection
• Battery Type: Lithium-Ion (Li-Ion)
• Voltage - Supply: 1.5 V ~ 5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: SOT-23-6
• Operating Supply Voltage (min): 1.5V
• Operating Supply Voltage (max): 5V
• Operating Temp Range: -40C to 85C
• Package Type: SOT-23
• Mounting: Surface Mount
• Pin Count: 6
• Operating Temperature Classification: Industrial
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: NCP802SN1T1OS

Overvoltage Detection
voltage. When the VCELL voltage crosses the overvoltage
detector threshold (VDET1) from a low value to a value
higher than VDET1, VD1 detects an over−charging
condition. The NCP802 then turns off an external, charge
control, N−channel, MOSFET by driving the CO pin to its
low level. A level shifter, incorporated in a buffer driver for
the CO pin, drives the low level of the CO pin to the P− pin
voltage, which is connected to the source of the charge
control MOSFET by a resistor. The high level of the CO pin
is driven to the VCELL voltage with a CMOS buffer.
VCELL pin must decrease to a level lower than VDET1. The
overvoltage detector does not reset after the battery voltage
falls below some hysteresis voltage. The NCP802 will not
The overvoltage detector (VD1) monitors the VCELL pin
To reset the CO pin to its high level, the voltage at the
I
J
VCELL
P−
GND
VCELL
P−
GND
DO
DO
M
V
A
A
V
V
V
Figure 43. Test Circuits
http://onsemi.com
VCELL
P−
GND
17
reset from an overvoltage fault as long as a charger is
connected to the battery. Rather, the excess−discharge
current detector (VD3) signals the IC to reset from an
overvoltage condition by detecting a load while in an
overvoltage condition. When the P− pin voltage becomes
equal to or greater than than the excess discharge−current
detector threshold (VDET3) during an overvoltage fault, the
NCP802 senses the voltage drop across the charge
MOSFET’s body diode induced by the load current. It then
resets from the overvoltage state.
and release from an overvoltage condition. If the fault or
reset conditions are shorter than their respective delay times,
the NCP802 ignores that condition and stays in its previous
state.
DO
CO
K
L
There are internal, fixed delay times for both the detection
A
V
A
VCELL
P−
GND
VCELL
P−
GND
DO