DC299 Introduction
Description
Demo board DC299 features the LTC1729 Li-Ion charge-termination IC in combination with the
LT1769 battery charger IC. This board provides a complete solution for charging 1- or 2-cell Li-
Ion batteries with a 2A charging current. These ICs have end-of-charge termination that can be
configured to stop the charger when the charge current drops below 10% of its initial setting or
when the internal timer counts to 3 hours. A safety termination feature disables charging if the
temperature is below 0
°
C or above 50
°
C and resumes charging when the temperature returns to
the 0
°
C to 50
°
C range. The solution extends battery life by trickle charging when the battery is
depleted and by meeting the battery manufacturers’ voltage requirement of 1% total accuracy.
Finally, the board adds convenience by automatically detecting when a battery or supply is
present.
This board is intended for designers who need the versatility of battery charger DC/DC
converters. The small size and efficiency of this circuit allow it to function in portable
applications as well as in wall operated chargers.
Quick Start Guide
It is simple to set up the DC299 demo board to charge a 1-cell or 2-cell Li-Ion battery. Follow the
procedure outlined below for proper operation. Note: Use the battery manufacturer’s
recommended safety procedures and protection circuits.
+
–
+
–
+
–
+
+
–
'SCOPE
BATTERY
TO BE
CHARGED
SYSTEM
LOAD
GND
UV OUT
PROGRAM
VBAT
GND
NTC
GND
+VIN
LT1769CGN/LTC1729CMS8
2A Li-Ion Battery Charger
With Termination Controller
Demo Circuit DC299A
U2
+
]
LED
]
C/10
]
3HR
JP1
Figure 1. DC299 Connection Diagram
