ISL6297 Intersil Corporation, ISL6297 Datasheet
ISL6297
Related parts for ISL6297
ISL6297 Summary of contents
Page 1
... Intersil’s patent-pending dual-mode charge technology to minimize the heat normally generated in a linear charger. By minimizing the heat generation, the ISL6297 can be placed inside the connector of the travel charger to completely remove the influence of the adapter cable on the charging performance. The ISL6297 is an enhancement of the original ISL6292B. ...
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... Trickle Charge Threshold - Rising Trickle Charge Threshold - Falling Recharge Threshold - Falling Difference from Final Battery Voltage Open Circuit Test Threshold- Rising 2 ISL6297 Thermal Information Thermal Resistance (Notes 1, 2) 4x4 QFN Package . . . . . . . . . . . . . . . . Junction Temperature Range . . . . . . . . . . . . . . . . .-55°C to +150°C Operating Temperature Range . . . . . . . . . . . . . . . . .-40°C to +85°C Storage Temperature Range . . . . . . . . . . . . . . . . . .-65° ...
Page 3
... LED Leakage Current NOTES: 3. The actual current may be lower due to the thermal foldback. 4. Guaranteed by design and characterization to be typically +100°C ±15%. 5. Guaranteed by design and characterization. 3 ISL6297 = 5V and +25°C ambient temperature. Maximum and minimum values are IN SYMBOL TEST CONDITIONS V V2P9 = 2.88V ...
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... 0.1μF X5R ceramic capacitor 22nF X5R or better timing capacitor TIME dual-color (red and green) LED in one package 80kΩ, 1% IREF R : 133kΩ, 1% IMIN 4 ISL6297 DESCRIPTION BAT VIN V2P9 VSEN R 1 TEMP TIME R RED ...
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... Block Diagram VIN Temperature C 1 Monitoring IREF R IREF Current References IMIN I MIN R IMIN I SEN V2P9 TEMP NTC Interface DT TIME GND 5 ISL6297 Q MAIN References Q SEN 100000:1 Current Mirror SEN Input_OK + CHRG + Trickle/Fast Minbat + - MIN_I Recharge LOGIC Under Temp ...
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... CHARGER > 4.05V and SEN I < I CHG MIN Timer Restart LED: GREEN CHARGER: ON TIMEOUT: RESTART V SEN 6 ISL6297 Plug-in Indicator LED: RED 500ms GREEN 500ms YELLOW 500ms OFF CHARGER: OFF Idle LED: OFF CHARGER: OFF ENABLE Delay 500ms LED: OFF CHARGER: ...
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... Figure 1 shows, with dotted lines, two cases in which the charge currents are limited by the maximum power dissipation capability due to the thermal foldback take advantage of the low-heat feature of the ISL6297, a REF current-limited AC/DC converter is required as the power supply to the charger. The current-limited supply has the I-V characteristics shown in Figure 2 ...
Page 8
... The indicator then turns off. This verifies that the AC/DC adapter and the ISL6297 have properly powered up. Charge Current The ISL6297 then waits in an idle mode until the enable pin indicates that the battery pack has been plugged in. A 500ms delay give time for the pins to be connected prior to the start of a connection verification operation ...
Page 9
... GREEN LED turns on for 500ms, then both turn on for 500ms (giving a YELLOW indication), and finally all the LEDs turn off. The ISL6297 turns on an LED by pulling the output line LOW with a constant current of 10mA (typical). A typical bi-color LED needs no series resistor for the LED connection, however, current can be minimized by adding a serial resistor in each LED path ...
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... FIGURE 5. OPEN BATTERY DETECTED Charge Current and R Selection IREF When the ISL6297 is used as a traditional linear charger, the RIREF sets the constant charge current. When working with a dual-mode, current-limited supply, the CC current is determined by the supply limited current ILIM. IREF needs to be programmed higher than ILIM and is used as an overcurrent protection ...
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... LED Indications The LED indicators show a number of conditions. On initial power on reset, the LEDs sequence through red, green and yellow. Once the charge begins, the ISL6297 pulls the RED pin low to drive a red indicator. Once the charge properly Charge Cycle 15 cycles ...
Page 12
... Foldback Over-heating is always a concern in a linear charger or in the INDICATION linear region for a dual mode charger. The charge current H Red (500ms) thermal foldback function in the ISL6297 frees users from L Green (500ms) the over-heating concern. L Yellow (500ms) Figure 8 shows the current signals at the summing node of ...
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... Typically, an NTC (negative temperature coefficient) resistor is mounted on the printed circuit board (PCB) to monitor the ambient temperature. Due to the self-heating of the PCB during charging, the ISL6297 provides the DT pin to set a higher temperature threshold during the charge operation. ...
Page 14
... Figure 12. V2P8 R TEMP ISL6297 GND FIGURE 12. EFFECTIVE NTC THERMISTOR CIRCUIT 14 ISL6297 With the series resistor R (EQ. 8) Once the thermistor and the temperature limits are selected, R and R S (EQ. 9) and (EQ. 10) To summarize, the NTC thermistor circuit design requires (EQ. 11) three steps: 1 ...
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... QFN package are able to have 5 vias. As much copper as ΔT ) possible should be connected to the exposed pad to (EQ. 20) minimize the thermal impedance. Refer to the ISL6297 evaluation board for layout examples. Related Literature • Technical Brief TB363 “Guidelines for Handling and Processing Moisture Sensitive Surface Mount Devices (SMDs)” ...
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... However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries. For information regarding Intersil Corporation and its products, see www.intersil.com 16 ISL6297 L16.4x4 16 LEAD QUAD FLAT NO-LEAD PLASTIC PACKAGE (COMPLIANT TO JEDEC MO-220-VGGC ISSUE C) ...