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LTC4100EGTRPBF Datasheet(PDF) 10 Page - Linear Technology |
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LTC4100EGTRPBF Datasheet(HTML) 10 Page - Linear Technology |
10 / 30 page LTC4100 10 4100fb Overview (Refer to Block Diagram) The LTC4100 is composed of a battery charger section, a charger controller, a 10-bit DAC to control charger current, an 11-bit DAC to control charger voltage, a SafetySignal decoder, limit decoder and an SMBus controller block. If no battery is present, the SafetySignal decoder indicates a RES_OR condition and charging is disabled by the charger controller (CHGEN = Low). Charging will also be disabled if DCDIV is low, or the SafetySignal is decoded as RES_HOT. If a battery is inserted and AC power is connected, the battery will be charged with an 80mA “wake-up” current. The wake-up current is discontinued after tTIMEOUT if the SafetySignal is decoded as RES_UR or RES_C0LD, and the battery or host doesn’t transmit charging commands. The SMBus interface and control block receives Charg- ingCurrent() and ChargingVoltage() commands via the SMBus. If ChargingCurrent() and ChargingVoltage() command pairs are received within a tTIMEOUT interval, the values are stored in the current and voltage DACs and the TEST CIRCUIT V VV V FOR V V x A DCIN V CLN CLP V TOL BAT VDAC VDAC VDAC = = = == – • .( ) 100 17 57 0 44 0 21 20 + – + – EA VDAC 0.6V LT1055 CSP BAT VSET ITH LTC4100 1.19V 4100 TC01 21 22 18 19 OPERATION charger controller asserts the CHGEN line if the decoded SafetySignal value will allow charging to commence. Charg- ingCurrent() and ChargingVoltage() values are compared against limits programmed by the limit decoder block; if the commands exceed the programmed limits these limits are substituted and overrange flags are set. The charger controller will assert SMBALERT when- ever a status change is detected, namely: AC_PRESENT, BATTERY_PRESENT, ALARM_INHIBITED, or VDD power- fail. The host may query the charger, via the SMBus, to obtain ChargerStatus() information. SMBALERT will be deasserted upon a successful read of ChargerStatus() or a successful Alert Response Address (ARA) request. Battery Charger Controller The LTC4100 charger controller uses a constant off-time, current mode step-down architecture. During normal operation, the top MOSFET is turned on each cycle when the oscillator sets the SR latch and turned off when the main current comparator ICMP resets the SR latch. |
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