Datasheet

SLUU158 – April 2003
5
bq24020/bq24023 Charger (bqTINY-II) Evaluation Module
1.2 Performance Specification Summary
Table 1. Performance Specification Summary
(1)
SPECIFICATION
TEST CONDITIONS MIN TYP MAX UNIT
Input DC voltage, V
I(DC)
V
REG
+ 0.5 5.0 5.2 V
Battery charge current
(1)
, I
O(CHG)
0.7 1.0 A
Power dissipation I
CHG
× (V
(DC+)
– V
(BAT+)
) 1.5 W
(1) This input voltage maximum is a function of the maximum allowable power dissipation on the device. The current level is
programmed for 0.7 A. If the programmed charge is changed, then the maximum input voltage needs to be adjusted.
P
MAX(IC
) = 1.5 W = I
CHG
(V
(DC+)
– V
(BAT+)
). The device has a maximum recommended operation of 6.5 VDC.
2 Test Summary
This section shows the test setups used, and the tests performed, in evaluating the EVM. See the
bq24020/bq24023 datasheet (SLUS549) for complete details on operation and specifications for the
charger device.
2.1 Test Setup
The bq24020/bq24023 EVM board requires a regulated 5-VDC, 1-A power source or a USB, 0.5-A port
maximum), to provide input power and a single-cell Li-Ion or Li-Pol battery pack.
NOTE: If powered from an USB, 0.1-A port, make sure ISET2 is pulled low to program the board for the
100mA charge. Skip any test steps that program the UUT to 0.5 A.
The test setup connections and jumper setting selections are configured for a stand-alone evaluation but
can be changed to interface with external hardware such as a microcontroller.
Table 2. I/O and Jumper Connections
(1)
JACK CONNECTION
J1–DC+
Power supply positive connection, preset to 5.0-VDC, 1.2-A current limit. Can also be powered by J2 (USB) if J1
power is absent.
J1–DC– Power supply return connection, ground
J2–USB Plug USB 0.5-A port – source for charging when J1 source is absent
J5–BAT+ Positive battery pack terminal
J5–BAT– Negative battery pack terminal, BAT–, is common with DC–
J5–TS/TTE
No connection – R4 is set to 20 kΩ to bias the TS signal in a charging state (bq24020) or to enable timers (TTE) for
bq24023. See datasheet (SLUS549) to activate TS for bq24020. Connection provides for optional external control.
J5–BAT– Return for thermistor (when used)
J3 (jumper) ISET2 program – 0.5A (HIGH) | 0.1 A (LOW)
J4 (jumper) CE (charge enable) – HIGH | LOW
J6 (jumper) BIAS power for EVM (jumper to active source) – DC+ | USB
J7 (jumper) STAT1 indication location – LED (EVM) | EXT
J9 (jumper) STAT2 indication location – LED (EVM) | EXT
J8–STAT1 External monitor hardware if J7–EXT is jumpered (not jumpered from factory)
J8–STAT2 External monitor hardware if J9–EXT is jumpered (not jumpered from factory)
J10 –CE
External CE control (TTL) – LOW–Enabled, HIGH–Disabled (remove jumper J4 when using J10–CE) EVM set
up for local control with jumper J4–LOW installed
J10–ISET2
External USB load control (TTL) – HIGH (0.5 A) | LOW (0.1 A) (remove jumper J3 when using J10–ISET2. EVM set
up for local control with jumper J3–0.1-A installed.
(1) Factory jumper selections are shown in BOLD