DS2715Z+ Maxim Integrated Products, DS2715Z+ Datasheet
DS2715Z+
Specifications of DS2715Z+
Related parts for DS2715Z+
DS2715Z+ Summary of contents
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... PIN CONFIGURATION C BIAS LED1 DNC V SS CTG CTG 16 SO See Table 1 for Ordering Information. Table 1. ORDERING INFORMATION PART MARKING DS2715Z+ D2715 DS2715Z+T&R D2715 DS2715BZ+ D2715B DS2715BZ+T&R D2715B + Denotes a lead(Pb)-free/RoHS-compliant package. T&R = Tape and reel. OPERATIONAL DIAGRAM DS2715 V BATT THM SNS- SNS+ ...
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ABSOLUTE MAXIMUM RATINGS* Voltage on V and V Pins with Respect Voltage on LED1 Pin Voltage on SNS- Voltage on C BIAS Voltage on all Other Pins Continuous Sink Current V CH Operating Temperature Range Storage ...
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PARAMETER SYMBOL Current Sense G Comparator Gain AC ELECTRICAL CHARACTERISTICS PARAMETER SYMBOL UVLO Debounce Time Current Sense Comparator Propagation Delay Discharge Detect Propagation Delay Return To Normal Function (Op-Amp or Comparator Mode) R Timing Accuracy T Internal Clock Accuracy ELECTRICAL ...
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PARAMETER SYMBOL dT/dt Blanking Time t PRECHARGE Timeout FAST-CHARGE Timer Range TOPOFF to FAST- CHARGE Duration Ratio Voltages relative to V Note 1: SS Does not include current through V Note 2: Below this voltage no I/O pins are active. ...
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Figure 1. BLOCK DIAGRAM ...
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Figure 2. STATE DIAGRAM ...
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DETAILED DESCRIPTION Charge Cycle Overview The DS2715 regulates the charge NiMH cells in a series configuration. With the mode select pin, the DS2715 can be configured to regulate either as an error amplifier in linear mode ...
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PRESENCE The DS2715 enters the PRESENCE state whenever V source is present, but no cell is available to charge. The DS2715 will remain in the PRESENCE state until a cell is inserted into the circuit causing the voltage on V ...
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Suspension of charge activity is possible by floating the R presence test conditions when suspending from a charge mode. The DISCHARGE mode is not affected by the SUSPEND function. The Vch output is high-impedance for charging modes, and operates as ...
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Hysteresis on the comparator input provides the difference between the ON and OFF state thresholds closed-loop regulation circuit, the comparator regulates voltage across the sense resistor as referenced to the SNS ...
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Figure 3. Ideal Comparator Input and Charge Control Output Waveforms sns Charge Rate Selection The charge rate is determined by an external sense resistor connected between the SNS+ and SNS- pins. The DS2715 will regulate the ...
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TEMPERATURE SENSE Accurate temperature sensing is needed to determine end of charge by dT/dt and to detect over temperature fault conditions. Connecting an external 10k NTC thermistor between THM and V Div and THM allows the DS2715 to sense temperature. ...
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Application Circuits Switchmode Figure 5 shows a typical DS2715 switchmode application circuit for charging a 3-cell battery stack. Connecting the MODE pin to CBIAS enables the comparator mode of current regulation. The DS2715 regulates the current through the current sense ...
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The R resistor (R5) is set to 47kΩ for a timeout of 70 minutes. This would be appropriate for cells with a capacity T of about 1Ah when charged with the 1.07A charge current. The resistor divider with R12 and ...
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Cell Stack Size Adjustment R12 and R13 of the application circuits form a voltage divider such that the voltage of a single cell is present on the Vbatt pin. This is required for proper operation of the DS2715. Given a ...
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Figure 7. Switching Circuit with Example Layout + Charge Source - Side - Charge Source Side + Another important layout detail is the connection of the sense resistor. Proper Kelvin connection layout should be used to ensure the signal quality ...
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REVISION HISTORY REVISION DATE 011408 Various comprehensive changes. 031609 Added device version DS2715B 042809 Updated Ordering Information table. DESCRIPTION PAGES CHANGED 6–15 1,4,7,8,10 1 ...