Texas Instruments BQ24022 bqTINY-II Evaluation Module BQ24022EVM BQ24022EVM 데이터 시트

5



-II) Evaluation Module

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Input DC voltage, VI(DC)

VREG + 0.5

5.0

5.2

V

Battery charge current(1), IO(CHG)

0.7

1.0

A

Power dissipation

 ICHG  

×

 (V(DC+) – V(BAT+))

1.5

W

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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.  
PMAX(IC) = 1.5 W = ICHG (V(DC+) – V(BAT+)).  The device has a maximum recommended operation of 6.5 VDC.

This section shows the test setups used, and the tests performed, in evaluating the EVM. See the
bq24020 datasheet (SLUS549) for complete details regarding the operation and specifications.

The bq24022 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.

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.

J1–DC+

Power supply positive connection, preset to 5.0VDC, 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–CE

NC – R4 is a pull down resistor, set to 20 k

Ω

, to enable charging.  J5–CE can be used as an external control.

J5–BAT–

N/C, optional external use

J3 (jumper)

ISET2 program – 0.5A (HIGH) | 0.1 A (LOW)

J4 (jumper)

Power good Indication location – LED (EVM) | EXT

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 –PG

External monitor hardware if J4–EXT is jumpered (not jumpered from factory)

J10–ISET2

External USB load control (TTL) – HIGH (500 mA) | LOW (100 mA) (remove jumper J3 when using J10–ISET2.
EVM set up for local control with jumper J3–0.1 A installed.

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Factory jumper selections are shown in BOLD