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MAX1908 Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX1908 Datasheet(HTML) 10 Page - Maxim Integrated Products |
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10 / 30 page  Low-Cost Multichemistry Battery Chargers 10 ______________________________________________________________________________________ ELECTRICAL CHARACTERISTICS (continued) (VDCIN = VCSSP = VCSSN = 18V, VBATT = VCSIP = VCSIN = 12V, VREFIN = 3V, VVCTL = VICTL = 0.75 x VREFIN, CELLS = open, CLS = REF, VBST - VLX = 4.5V, ACIN = GND = PGND = 0, CLDO = 1µF, LDO = DLOV, CREF = 1µF; CCI, CCS, and CCV are compensated per Figure 1a; TA = -40°C to +85°C, unless otherwise noted.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS ERROR AMPLIFIERS GMV Amplifier Transconductance GMV VVCTL = VLDO, VBATT = 16.8V, CELLS = VREFIN 0.0625 0.250 µA/mV GMI Amplifier Transconductance GMI VICTL = VREFIN, VCSIP - VCSIN = 75mV 0.5 2.0 µA/mV GMS Amplifier Transconductance GMS VCLS = VREF, VCSSP - VCSSN = 75mV 0.5 2.0 µA/mV CCI, CCS, CCV Clamp Voltage 0.25V < VCCV,CCS,CCI < 2V 150 600 mV LOGIC LEVELS CELLS Input Low Voltage 0.4 V CELLS Input Open Voltage CELLS = open (VREFIN /2) - 0.2V (VREFIN /2) + 0.2V V CELLS Input High Voltage VREFIN - 0.4V V ACOK AND SHDN ACOK Input Voltage Range 0 28 V ACOK Sink Current V ACOK = 0.4V, VACIN = 3V 1 mA SHDN Input Voltage Range 0 LDO V SHDN Threshold V SHDN falling 22 25 % of VREFIN Note 1: If both ICTL and VCTL use default mode (connected to LDO), REFIN is not used and can be connected to LDO. Note 2: Specifications to TA = -40°C are guaranteed by design and not production tested. LOAD-TRANSIENT RESPONSE (BATTERY INSERTION AND REMOVAL) MAX1908 toc01 1ms/div IBATT 2A/div VBATT 5V/div VCCI 500mV/div VCCV 500mV/div ICTL = LDO VCTL = LDO CCV CCI LOAD-TRANSIENT RESPONSE (STEP IN-LOAD CURRENT) MAX1908 toc02 1ms/div VBATT 2V/div VCCI 500mV/div VCCS 500mV/div 16.8V 0 0 LOAD CURRENT 5A/div ADAPTER CURRENT 5A/div ICTL = LDO CHARGING CURRENT = 3A VBATT = 16.8V LOAD STEP = 0 TO 4A ISOURCE LIMIT = 5A CCS CCS CCI CCI VBATT 2V/div 0 0 0 CHARGE CURRENT 2A/div LOAD CURRENT 5A/div ADAPTER CURRENT 5A/div LOAD-TRANSIENT RESPONSE (STEP IN-LOAD CURRENT) MAX1908 toc03 1ms/div ICTL = LDO CHARGING CURRENT = 3A VBATT = 16.8V LOAD STEP = 0 TO 4A ISOURCE LIMIT = 5A Typical Operating Characteristics (Circuit of Figure 1, VDCIN = 20V, TA = +25°C, unless otherwise noted.) |
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