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Semiconductor Components Industries, LLC, 2001
October, 2001 – Rev. 4
1 Publication Order Number:
NCP802/D
NCP802
Highly Integrated Lithium
Battery Protection Circuit
for One Cell Battery Packs
The NCP802 resides in a lithium battery pack where the battery cell
continuously powers it. This circuit senses cell voltage, charge
current, and discharge current, and correspondingly controls the state
of two, N–channel MOSFET switches. These switches reside in series
with the negative terminal of the cell and the negative terminal of the
battery pack. During a fault condition, the NCP802 open circuits the
pack by turning off one of these MOSFET switches, which
disconnects the current path. Internal delay circuitry minimizes
external component count.
Features
• Highly Accurate Overvoltage Detector
25 mV at Room Temperature
30 mV from –5 to 55°C
• Internally Trimmed Fault Detection Thresholds
Overvoltage Threshold: 4.35 V
Undervoltage Threshold: 2.4 V
Discharge Current Threshold: 0.200 V
Charge Current Threshold: 0.100 V
• Internal Output Delays
Overvoltage Output Delay: 250 ms
Undervoltage Output Delay: 20 ms
Discharge Current Output Delay: 12 ms
Charge Current Output Delay: 16 ms
• Absolute Maximum Rating of 28 V for the Charger Input
• Low Quiescent Current
Normal Operating Current: 3.0 A
Standby Current when Cells are Discharged: 0.1 A
• Allows Optional Zero Volt Charging
• Available in a Low Profile Surface Mount Package
Figure 1. Typical One Cell Lithium Ion Battery Pack
DO CO P–
V
cell
Gnd
NCP802
http://onsemi.com
SOT23–6
SUFFIX
CASE 1262
6
1
16
4
2
3
SOT23–6
(Top View)
DO
P–
CO
Gnd
DS
PIN CONNECTIONS
5V
cell
KN = Specific Device Code
xx = Date Code
MARKING
DIAGRAMS
KNxx
Device Package Shipping
ORDERING INFORMATION
NCP802SN1T1 SOT23–6 3000 Tape & Reel
SON–6
SAN SUFFIX
CASE 494
KN
xx
1
6
NCP802SAN1T1 SON–6 3000 Tape & Reel
SON–6
(Top View)
16
4
2
3
5
DO
Gnd
V
cell
P–
CO
DS
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