BQ24165 Datasheet, PDF (22/35 Pages) Texas Instruments – 2.5A, Dual-Input, Single Cell Switch Mode Li-Ion Battery Charger with Power Path

bq24165
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SLUSAP4A – DECEMBER 2011 – REVISED MARCH 2012
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Input Over-Voltage Protection
The bq24165/6/7 provides over-voltage protection on the input that protects downstream circuitry. The built-in
input over-voltage protection to protect the device and other components against damage from overvoltage on
the input supply (Voltage from V_USB or V_IN to PGND). When V_SUPPLY > V_OVP, the bq24165/6/7 turns off the PWM
converter, suspends the charging cycle and turns the battery FET and BGATE on. Once the OVP fault is
removed, the device returns to the operation it was in prior to the OVP fault.
STATUS INDICATORS (CHG, PG)
The bq24165/6/7 contains two open-drain outputs that signal its status. The PG output indicates that a valid input
source is connected to USB or IN. PG is low when V_SUPPLY>V_UVLO AND (V_BAT+V_SLP) < V_SUPPLY < V_OVP. When
there is no supply connected to either input within this range, PG is high impedance. Table 3 illustrates the PG
behavior under different conditions.
The CHG output indicates new charge cycles. When a new charge cycle is initiated by CE1 and CE2, toggling
High Impedance mode or toggling the input power, CHG goes low and remains low until termination. After
termination, CHG remains high impedance until a new charge cycle is initiated. CHG does not go low during
recharge cycles. Table 4 illustrates the CHG behavior under different conditions.
Connect PG and CHG to the DRV output through an LED for visual indication, or connect through a 100kΩ
pullup to the required logic rail for host indication.
Table 3. PG Status Indicator
CHARGE STATE
V_SUPPLY < V_UVLO
V_SUPPLY < (V_BAT+V_SLP)
(V_BAT+V_SLP) < V_SUPPLY < V_OVP
VS_UPPLY > V_OVP
PG BEHAVIOR
High-Impedance
High-Impedance
Low
High-Impedance
Table 4. CHG Status Indicator
CHARGE STATE
Charge in progress Charging suspended by thermal loop
Charge Done
Recharge Cycle after Termination
Timer Fault
No Valid Supply
No Battery Present
CHG BEHAVIOR
Low (first charge cycle)
High-Impedance (recharge cycles)
High-Impedance
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