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ISL88731AHRZ-T View Datasheet(PDF) - Intersil

Part Name
Description
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ISL88731AHRZ-T
Intersil
Intersil Intersil
ISL88731AHRZ-T Datasheet PDF : 23 Pages
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ISL88731A
Undervoltage Detect and Battery Trickle
Charging
If the voltage at CSON falls below 2.5V, the ISL88731A reduces
the charge current limit to 128mA to trickle charge the battery.
When the voltage rises above 2.7V the charge current reverts to
the programmed value in the ChargeCurrent register.
Over-Temperature Protection
If the die temperature exceeds +150°C, it stops charging. Once
the die temperature drops below +125°C, charging will start up
again.
Overvoltage Protection
ISL88731A has an Overvoltage Protection circuit that limits the
output voltage when the battery is removed or disconnected by a
pulse charging circuit. If CSON exceeds the output voltage set
point in the charge voltage register by more than 300mV an
internal comparator pulls VCOMP down and turns off both upper
and lower FETs of the buck as in Figure 15. There is a delay of
approximately 1µs between VOUT exceeding the OVP trip point
and pulling VCOMP, LGATE and UGATE low. After UGATE and
LGATE are turned OFF inductor current continues to flow through
the body diode of the lower FET and VOUT continues to rise until
inductor current reaches zero.
FIGURE 15. OVERVOLTAGE PROTECTION IN ISL88731A
10
FN6738.3
June 8, 2011
 

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