NCP802 Datasheet, PDF (1/23 Pages) ON Semiconductor – Highly Integrated Lithium Battery Protection Circuit for One Cell Battery Packs

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
• Fault Detection Thresholds
Overvoltage Threshold:
SN1/SAN1 = 4.35 V, SAN5 = 4.275 V, SAN6 = 4.28 V
Undervoltage Threshold:
SN1/SAN1 = 2.4 V, SAN5/6 = 2.3 V
Discharge Current Threshold:
SN1/SAN1/SAN6 = 0.2 V, SAN5 = 0.1 V
Charge Current Threshold: 0.1 V
• Internal Output Delays
Overvoltage Output Delay:
SN1/SAN1/SAN6 = 250 ms, SAN5 = 1 ms
Undervoltage Output Delay: 20 ms
Discharge Current Output Delay:
SN1/SAN1/SAN6 = 12 ms, SAN5 = 6 ms
Charge Current Output Delay:
SN1/SAN1/SAN6 = 16 ms, SAN5 = 8 ms
• Absolute Maximum Rating of 28 V for the Charger Input
• Low Quiescent Current
Normal Operating Current: 3.0 mA
Standby Current when Cells are Discharged: 0.1 mA
• Zero Volt Charging
• Available in a Low Profile Surface Mount Package
• Pb−Free Package is Available*
http://onsemi.com
MARKING
DIAGRAMS
6
1
SOT23−6
SN SUFFIX
CASE 1262
XXxx
6
SON−6
XX
SAN SUFFIX
xx
CASE 494
1
XX = Specific Device Code
xx = Date Code
PIN CONNECTIONS
DO 1
P− 2
CO 3
6 Gnd
5 V_cell
4 DS
SOT23−6
(Top View)
DO 1
6 P−
V_cell 2
5 CO
Gnd 3
4 DS
SON−6
(Top View)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 20 of this data sheet.
*For additional information on our Pb−Free
strategy and soldering details, please download
the ON Semiconductor Soldering and Mounting
Techniques Reference Manual, SOLDERRM/D.
© Semiconductor Components Industries, LLC, 2004
1
September, 2004 − Rev. 10
Publication Order Number:
NCP802/D