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MAX712CSE Datasheet(PDF) 3 Page - Maxim Integrated Products |
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MAX712CSE Datasheet(HTML) 3 Page - Maxim Integrated Products |
3 / 17 page ELECTRICAL CHARACTERISTICS (continued) (IV+ = 10mA, TA = TMIN to TMAX, unless otherwise noted. Refer to the Typical Operating Circuit. All measurements are with respect to BATT-, not GND.) Note 1: The MAX712/MAX713 are powered from the V+ pin. Since V+ shunt regulates to +5V, R1 must be small enough to allow at least 5mA of current into the V+ pin. Note 2: Offset voltage of THI and TLO comparators referred to TEMP. Note 3: tA is the A/D sampling interval (Table 3). Note 4: This specification can be violated when attempting to charge more or fewer cells than the number programmed. To ensure proper voltage-slope fast-charge termination, the (maximum battery voltage) ÷ (number of cells programmed) must fall within the A/D input range. NiCd/NiMH Battery Fast-Charge Controllers _______________________________________________________________________________________ 3 Battery voltage ÷ number of cells programmed VFASTCHG = 10V VFASTCHG = 0.4V CONDITIONS V 1.4 1.9 A/D Input Range (Note 4) µA 10 FASTCHG High Current mA 2 FASTCHG Low Current UNITS MIN TYP MAX PARAMETER Typical Operating Characteristics (TA = +25°C, unless otherwise noted.) 20 1k 100k 1M 10k 10M CURRENT-SENSE AMPLIFIER FREQUENCY RESPONSE (with 15pF) -20 FREQUENCY (Hz) -10 0 10 40 -120 -80 -40 0 C2 = 15pF FASTCHG = 0V VOUT VIN CURRENT- SENSE AMP BATT- BATT- CC GND - - + + AV Φ MAX712/13 toc01 20 -10 -20 10 1k CURRENT-SENSE AMPLIFIER FREQUENCY RESPONSE (with 10nF) 0 10 40 -80 -120 -40 0 FREQUENCY (Hz) 100 10k C2 = 10nF FASTCHG = 0V AV Φ MAX712/13 toc02 100 0.1 1.95 1.97 2.01 2.05 CURRENT ERROR-AMPLIFIER TRANSCONDUCTANCE 1 10 VOLTAGE ON CC PIN (V) 1.99 2.03 FASTCHG = 0V, V+ = 5V 5.8 4.8 060 SHUNT-REGULATOR VOLTAGE vs. CURRENT 5.6 CURRENT INTO V+ PIN (mA) 30 5.2 5.0 10 20 50 5.4 4.0 4.4 4.2 4.6 40 DRV NOT SINKING CURRENT DRV SINKING CURRENT 1.0 060 ALPHA SENSORS PART No. 14A1002 STEINHART-HART INTERPOLATION 1.6 BATTERY TEMPERATURE( °C) 30 1.4 1.2 10 20 50 0.2 0.6 0.4 0.8 20 35 30 25 0 10 5 15 40 MAX712/13 toc05 |
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