Linear Technology DC1007C Manual page 2

DEMO MANUAL DC1007C
QUICK START PROCEDURE
Demonstration circuit 1007 is best evaluated using a Li-
Ion/Polymer battery. When using a battery simulator for
evaluation, oscillations must be verified with a real battery
at the same conditions because it is difficult to match the
impedance of a real battery, which is required for battery
charger stability.
Refer to Figure 1 for the proper measurement and equip-
ment setup and follow the procedure below.
1. If using an external supply, connect a 0V to 6V, 1.5A
supply with voltage adjusted to 0V between the VBUS
and GND terminals. Connect a voltmeter across the
VBUS and GND terminals. If using the USB input op-
tion, have cable ready to plug in when all loads and
jumpers are set. Do not use the USB input and an
external supply at the same time.
2. Set JP1, NTC jumper to INT to use the demo board
resistor. To use an external NTC resistor, connect an
NTC resistor between J2 - J3 and the GND terminal.
Then set the NTC jumper to EXT.
3. Use Table 1 to set JP2, JP3, and JP4 (D0, D1, and D2
respectively) to select the desired input current limit
and charger status.
Table 1. Controlled Input Current Limit
D0 D1 D2
0 0 0
0 0 1
0 1 0
0 1 1
1 0 0
1 0 1
1 1 0
1 1 1
2
CHARGER I
LIM
ON 100mA (1×)
OFF 100mA (1×)
ON 500mA (5×)
OFF 500mA (5×)
ON 1A (10×)
OFF 1A (10×)
OFF 500µA (SUSP)
OFF 2.5mA (SUSP)
4. Connect a 0mA to 25mA adjustable load in series
with an ammeter between the 3.3V and GND termi-
nals. Connect a voltmeter between the 3.3V and GND
terminals.
5. Connect a 0A to 2A adjustable load in series with an
ammeter between the VOUT terminal and the GND
terminal. Connect a voltmeter between the VOUT and
GND terminals.
6. Connect a partially charged (~3.6V) lithium-ion bat-
tery with the positive lead to the BAT terminal and the
negative lead to a GND terminal. Connect the positive
lead of a voltmeter to the BAT terminal and the nega-
tive lead to the GND terminal. Connect the positive
terminal of a voltmeter to PROG and the negative
terminal to GND to measure the current flowing into
the battery. The voltage on PROG will read 1V when
the maximum charge current is reached. The voltage
on CLPROG will read 1.188V when the input current
is reached. Observe VOUT and the 3.3V output.
V
PROG
=
I •1031
BAT
R
PROG
V
CLPROG
I =I +
VBUS BUSQ
R
CLPROG
See the data sheet for the proper values of I
h in the 1×, 5× and 10× modes.
CLPROG
7. If using the USB input, plug in the USB cable and ob-
serve the charge current, VOUT, and the 3.3V output.
If using an external power supply, slowly increase the
supply and observe that the LTC4088 starts to use
the VBUS input power as the VBUS reaches 4.35V.
( )
• h +1
CLPROG
and
BUSQ
dc1007cf