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MAX712

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MAX712

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Technical/Catalog Information	MAX7129CPL+
Vendor	Maxim Integrated Products
Category	Integrated Circuits (ICs)
Package / Case	40-DIP (600 mil)
Digits or Characters	A/D 4.5 Digits
Configuration	7 Segment
Display Type	LCD
Interface	-
Packaging	Tube
Current - Supply	1mA
Voltage - Supply	6 V ~ 14 V
Operating Temperature	0°C ~ 70°C
Lead Free Status	Lead Free
RoHS Status	RoHS Compliant
Other Names	MAX7129CPL+ MAX7129CPL+

Product	Manufacturers	Pack	D/C
MAX712	Maxim	-	08+

Figure 8-21 shows a MAX713 connected to provide a fast charge for two cells at 1 A. Higher charge currented and greater number of cells can be accommodated by changing RSENSE and the PGMO-PCM3 connections (as described in the date sheet).Figure 8-22 shows the pin connections and Fig. 8-23 shows the circuit waveforms. Notice that the circuit of Fig. 8-21 cannot service a loud while charging. The Fig. 8-21 circuit is usually used with an ac-to-dc wall cube (transformer,bridge rectifier, and capactior in a plug-in package).Figures 8-24.8-25,and 8-26 show the characteristics of three consumer-product wall cubes. when selecting a wall cube, be sure that the lowest dip in the wall-cube voltage. Figure 8-27 shows the connections for controlling charge cutoff with negative-temperature-coefficient (NTC) thermistors. Use the same model of thermistor for T1 and T2 so that both have the same nominal resistance. The voltage at TEMP is 1 V (referred to batt-) when the battery is at ambient temperature.some battery pavks might come with a temperature-detecting thermistor connected to the negative terminal of the battery pack. In this case, use the connections shown in Fig. 8-28. T2 and T3 can be replaced with standard resistors if absolute temperature cutoff is acceptable.The absolute maximum voltage rating for the BATT+ input voltage must be limited by external circuits when DC IN is not applied, as shown in Fig. 8:29. Rsense causes a small efficiency loss during battery use. The efficiency loss is significant only if Rsense is much greater than the internal resistance of the battery pack. The circuit of Fig. 8-30 can be used to shunt Rsense whenever power is removed from the charger. Figure 8-31 shows a circuit used to indicate charger status, with logic-level outputs. Figure 8-32 shows an LED drive circuit that indicates charger status. MAXIM NEW RELEASES DATA BOOK, 1994, P. 4-60, 4-61, 4-63, 4-64.

The MAX713SWEVKIT-SO is a fully assembled and tested urface-mount board. The MAX713 high-current, switchmode attery charger controls a P-channel power MOSFET, llowing charge currents up to 1A. Switch-mode peration typically provides 75%-efficient conversion, educing heat compared to linear-regulator solutions.

The MAX713SWEVKIT can also be used to evaluate theMAX712 just by replacing the MAX713CSE with aMAX712CSE.

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	Part Number	Mfg	Pack	D/C	Qty	Note

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