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ISL9301 Datasheet(PDF) 10 Page - Intersil Corporation |
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ISL9301 Datasheet(HTML) 10 Page - Intersil Corporation |
10 / 12 page 10 FN6435.0 February 25, 2008 VOUT is regulated at 4.5V, the charger is ON, delivering a trickle charge current. The IC moves to a fast charge constant current mode when VBAT reaches the VMIN threshold. There are 3 possible states in this mode depending on the output current. When the sum of the output current and the fast charge current is smaller than the input current limit, the IC enters the Fast Charge state with the charge current set by RIREF. When the output current and the fast charge current are greater than the input current limit, the IC will enter the PPM mode, where the charging current is reduced to a point such that the sum of output current and the charging current equals to the input current limit. If the output current by itself is greater than the input current limit, the IC enters the Battery Discharge state, where the battery is discharged to the system to supply a part of the output demand. When the battery voltage reaches 4.2V, the IC enters the CV Charge state, where PPR is LO, CHG is LO and VOUT is regulated at 4.5V. The battery is being charged at a constant voltage while the charging current decreases. When the charging current is reduced to the IMIN threshold, the IC enters a Charge Complete state, where PPR is LO, CHG is HI, VOUT is regulated at 4.5V and the charger continues to charge the battery. When the timeout interval has elapsed after the Charge Complete state, the IC will enter the Disabled state, where the PPR is LO, CHG is HI, VOUT is regulated at 4.5V and the charger is OFF. After the Charge Complete state, if VBAT is below the re-charge threshold, the IC will re-initialize and start a new cycle. If the timeout limit is reached before the Charge Complete state, the IC enters the Charger Fault state, where PPR is LO, CHG is blinking, VOUT is regulated at 4.5V and the charger is OFF. This state is latched until the input power is removed and re-applied to start a new cycle. Any time during the operation, if the die temperature reaches the OTP threshold, the IC will enter the OTP state, where PPR is LO, CHG is HI, and the charger is OFF. VOUT is disconnected from VIN and connected to VBAT internally to maintain system power need. Summary of Output States The output states under various fault conditions are summarized in Table 1. TABLE 1. OUTPUT STATES UNDER FAULT CONDITIONS OTP OVP BATON M1 M2 Y Y H OFF ON Y N H OFF ON N Y H OFF ON Y Y L OFF OFF Y N L OFF OFF N Y L OFF OFF N N X Regulating Charging NOTES: BATON: BATON Pin OVP: Input Over Voltage Protection OTP: Over Temperature Protection M1: Output Path MOSFET M2: Battery Path MOSFET ISL9301 |
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