www.ti.com
USB PLUG
USB
Connector
J9
J5
LDO GND
OUT
GND
J7
Bat +
Bat −
TS
J8
(DC−)
Alternate
Connection
J1
USB
GND
J2
AC
GND
5.25 VDC
P/S
#1
DMM
#1
+
−
1 k
W
10
W
DMM
#2
+
−
Li-ion, Single Cell
DMM
#3
+
−
bq2403x Charger EVM −
bqTiny-III
E
HPA073
UUT
To 500 mA
(High PWR Port)
4.3
Test Procedure
Test Summary
Figure 1. Test Diagram
1. Verify that the equipment is set up according to Equipment Setup section.
2. Set jumpers on the UUT as follows: JMP1-0.5; JMP2-AC; JMP3-EN; set JMP4 through JMP7 to LED.
3. Adjust R_DPPM until TP1 is 31 k
Ω
± 0.1 k
Ω
with respect to GND, and adjust R_TMR until TP2 is 50
k
Ω
with respect to GND.
4. Verify that V
OUT
is approximately equal to V
BAT
(if Vout < 1.1 V, the output is in short-circuit mode. To
get out of this mode, momentarily disconnect the 10-
Ω
load, or touch a 1-
µ
F capacitor between the
DPPM pin and ground).
5. Power up the +5.25-VDC Supply to the UUT.
6. Verify V
BAT
is between 2.4 VDC and 3.0 VDC, and the charger is in pre-charge state: LEDs STAT1
(D2), STAT2 (D3), and ACPG (D5) are on.
If V
BAT
is above the low-voltage threshold (V
(LOWV)
~3 V), then the IC is in fast-charge mode {STAT2
(D3) is off (High)}. If the IC is in fast charge, skip step 10.
7. Verify I
BAT
is ~0.1 A (I
BAT
~ = I
AC
– (V
OUT
/ R
OUT
) –0.01 A)
8. Verify V
OUT
is between 4.3 VDC and 4.5 VDC for the bq24032 IC. The bq24030/1/5 switches the input
to the output for V
AC
less than 6 V. The bq24030/1 regulates V
OUT
to 6 V for larger inputs, and the
bq24035 turns off the charging and output for an AC input above 6 VDC.
9. Verify V
LDO
is between 3.2 VDC and 3.4 VDC.
10. Allow the battery to charge until V
BAT
is between 3.2 VDC and 4.0 VDC. The charger should deliver
the programmed constant current to the battery unless the input cannot source the required current.
11. Verify D3 (STAT2) has turned off.
12. Verify I
BAT
is ~1.0 A (for a 10-k
Ω
resistor on ISET1, I
BAT
~ = I
AC
– (V
OUT
/ R
OUT
) – 0.01 A).
13. Verify I
AC
is ~1.5 A (for 10-
Ω
OUT load and 10 k
Ω
on ISET1).
14. Apply a short between J3-4 (CE) and J3-3 (GND) on the UUT. This overrides the JMP3 100-k
Ω
pullup,
disables the charging, puts the IC in low power mode and connects the battery to the OUT pin. Note
that if CE is floated (JMP3 is removed and J3-4 connection is removed) the IC may bounce between
the charging and disabled states. Verify on the scope that V
OUT
does not drop out. Note that the
transition between power sources is implemented by break-before-make switching and requires the
capacitance on V
OUT
to be able to hold up the system voltage for at least 50 µs.
15. Verify D2 (STAT1) has turned off.
16. Verify I
AC
drops below 10 mA (should be < 200 µA into the IC if ACPG LED (current) JMP6 is
removed).
4
bq2403x (bqTiny-III™) 1.5-A Single-Chip Li-Ion
SLUU207A – October 2004 – Revised January 2007
and Li-Pol Charge Management IC EVM
