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LTC4006 Datasheet(PDF) 9 Page - Linear Technology |
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LTC4006 Datasheet(HTML) 9 Page - Linear Technology |
9 / 20 page 9 LTC4006 4006fa OPERATIO comparesthiscurrentagainstthedesiredcurrentprogrammed by RIMON at the IMON pin and adjusts ITH until: V R VV A k k REF IMON CSP BAT = +µ Ω Ω –. • 11 67 3 3 therefore, I V R A k R CHARGE REF IMON SENSE =µ ⎛ ⎝⎜ ⎞ ⎠⎟ Ω –. • 11 67 3 The voltage at BAT is divided down by an internal resistor divider and is used by error amp EA to decrease ITH if the divider voltage is above the 1.19V reference. When the charging current begins to decrease, the voltage at IMON will decrease in direct proportion. The voltage at IMON is then given by: VI R A k R k IMON CHARGE SENSE IMON =+ µ Ω () Ω •. • • 11 67 3 3 Table 1. Truth Table for LTC4006 Operation MODE DCIN BAT VOLTAGE BAT CURRENT ACP/SHDN TIMER STATE CHG* Shut Down by Low Adapter Voltage <BAT >UVLO Leakage LOW Reset HIGH Conditioning a Depleted Battery >BAT <2.5V/Cell 10% Programmed HIGH Running LOW Current Normal Charging >BAT >2.5V/Cell Programmed HIGH Running LOW Current Input Current Limited Charging >BAT >2.5V/Cell Programmed HIGH Running LOW Current Charger Paused Due to Thermistor Out of Range >BAT X OFF HIGH Paused LOW or 25 µA (Faulted) Shut Down by ACP/SHDN Pin >BAT X OFF Forced LOW Reset HIGH Terminated by Low-Battery Fault (Note 1) >BAT <2.5V/Cell OFF HIGH >T/4 Stopped HIGH (Faulted) Top-Off Charging. C/10 is Latched >BAT VFLOAT OFF HIGH <T/4 After C/10 25 µA Comparator Trip. Running Timer is Reset by C/10 Comparator (Latched), >BAT VFLOAT OFF HIGH >T/4 After C/10 HIGH then Terminates After 1/4 T Comparator Trip. (Waiting Stopped for Restart) Terminated by Expired Timer >BAT VFLOAT** OFF HIGH >T Stopped HIGH (Waiting for Restart) Timer Defeated. (Low-Battery Conditioning Still X X X X X Forced LOW Functional) Shut Down by Undervoltage Lockout >BAT <UVL OFF HIGH Reset HIGH** and <UVL Timer Defeated Until VBAT > 3.9V/Cell >BAT 2.5V ≤ VBAT ≤3.9V Programmed HIGH Running LOW (V/Cell) Current *Open Drain. High when used with pull-up resistor. **Most probable condition, X = Don’t care Note 1: If a depleted battery is inserted while the charger is in this state, the charger must be reset to initiate charging. The accuracy of VIMON will range from 0% to ITOL. VIMON is plotted in Figure 2. The amplifier CL1 monitors and limits the input current to a preset level (100mV/RCL). At input current limit, CL1 will decrease the ITH voltage, thereby reducing charging cur- rent. When this condition is detected, the C/10 indicator will Figure 2. VIMON vs ICHARGE ICHARGE (% OF MAXIMUM CURRENT) 0 0 0.2 0.4 0.6 0.8 4006 F02 1.0 1.2 20 40 60 80 100 1.19V 0.309V |
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