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BQ2004HSNG4 Datasheet(PDF) 7 Page - Texas Instruments |
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BQ2004HSNG4 Datasheet(HTML) 7 Page - Texas Instruments |
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7 / 18 page  Maximum charge time is configured using the TM pin. Time settings are available for corresponding charge rates of C/4, C/2, 1C, and 2C. Maximum time-out termi- nation is enforced on the fast-charge phase, then reset, and enforced again on the top-off phase, if selected. There is no time limit on the trickle-charge phase. Top-off Charge An optional top-off charge phase may be selected to follow fast charge termination for the C/2 through 4C rates. This phase may be necessary on NiMH or other battery chemistries that have a tendency to terminate charge prior to reaching full capacity. With top-off en- abled, charging continues at a reduced rate after fast-charge termination for a period of time equal to 0.235 ∗ the fast-charge safety time (See Table 1.) Dur- ing top-off, the MOD pin is enabled at a duty cycle of 260 µs active for every 1820µs inactive. This modula- tion results in an average rate 1/8th that of the fast charge rate. Maximum voltage, time, and temperature are the only termination methods enabled during top- off. Pulse-Trickle Charge Pulse-trickle charging may be configured to follow the fast charge and optional top-off charge phases to com- pensate for self-discharge of the battery while it is idle in the charger. In the pulse-trickle mode, MOD is active for 260 µsofa period specified by the settings of TM1 and TM2. See Table 1. The resulting trickle-charge rate is C/512. Both pulse trickle and top-off may be disabled by tying TM1 and TM2 to VSS or by selecting Mode 2 in the dis- play. Charge Status Indication Charge status is indicated by the LED1 and LED2 out- puts. The state of these outputs in the various charge cy- cle phases is given in Table 2 and illustrated in Figure 3. In all cases, if VCELL exceeds the voltage at the MCV pin, both LED1 and LED2 outputs are held low regard- less of other conditions. Both can be used to directly drive an LED. Charge Current Control The bq2004E/H controls charge current through the MOD output pin. The current control circuitry is designed to sup- port implementation of a constant-current switching regulator or to gate an externally regulated current source. When used in switch mode configuration, the nominal regulated current is: IREG = 0.225V/RSNS Charge current is monitored at the SNS input by the voltage drop across a sense resistor, RSNS, between the low side of the battery pack and ground. RSNS is sized to provide the desired fast charge current. If the voltage at the SNS pin is less than VSNSLO, the MOD output is switched high to pass charge current to the battery. When the SNS voltage is greater than VSNSHI, the MOD output is switched low—shutting off charging current to the battery. VSNSLO = 0.04 ∗ VCC ± 25mV VSNSHI = 0.05 ∗ VCC ± 25mV When used to gate an externally regulated current source, the SNS pin is connected to VSS, and no sense re- sisitor is required. 7 bq2004E/H |
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