ISL97702 Intersil Corporation, ISL97702 Datasheet
ISL97702
Available stocks
Related parts for ISL97702
ISL97702 Summary of contents
Page 1
... FET. A dual feedback circuit allows simple switching between two pre-defined output vbltages using a single logic input.. With an input voltage of 2.3V to 5.5V the ISL97702 has an output capability 50mA at 18V using integrated 500mA switches. Efficiencies are up to 87%. The integrated protection FET is used to disconnect the boost inductor from the input supply whenever an output fault condition is detected, or when the device is disabled ...
Page 2
... Compensation Compensation As As Ramp-Generator Ramp-Generator Error Error Av Av Amplifier Amplifier Ccomp Ccomp Clamp Clamp Ai Ai Voltage Voltage Reference Reference FIGURE 1. ISL97702 BLOCK DIAGRAM Under-Voltage Under-Voltage Detector Detector Over-Current Over-Current S2 S2 Detector (DC) Detector (DC) Over- Over- Voltage Voltage 2 2 Detector Detector EN EN Gate ...
Page 3
... Input Reference Voltage on FB1 FB1 I Input Current in FB0 FB0 I Input Current in FB1 FB1 3 ISL97702 = 25°C) Continuous Current in VDD, GND, VDDOUT 650mA Continuos Current in NSYNC, FB0, FB1, SEL, NEN 10mA +1V Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C OUT T Ambient Operating Temperature .-40°C to +85°C ...
Page 4
... ACC Output Voltage Accuracy, Assuming Resistor Divider Tolerances of 0.1% or Better ∆V /∆IOUT Load Regulation OUT ∆V /∆VDD Line Regulation OUT 4 ISL97702 = -40°C to +85°C unless otherwise stated (Continued) A CONDITION SEL = VDD 10mA FB0 SEL = GND 10mA FB1 f = 600kHz NSYNC FB1 = GND t > ...
Page 5
... I (mA) OUT FIGURE 4. EFFICIENCY OUT OUT L = 6.8µH (TDK RLF7030 6.6µF FIGURE 6. START-UP TO 12V @ SEL = 0 (V =3.6V, R =360Ω ISL97702 4.2V 100 150 FIGURE 3. EFFICIENCY 18.3V) OUT 4.2V 150 200 = 12.6V) FIGURE 5. EFFICIENCY 4. 3.6V 2. 100 I (mA) ...
Page 6
... Typical Performance Curves FIGURE 8. 12V->18V TRANSITION (V =3.6V, R =360Ω ISL97702 (Continued) FIGURE 10. SHUT DOWN @ SEL = 1 (V =3.6V, R =360Ω FIGURE 9. 18V->12V TRANSITION (V =3.6V, R =360Ω October 13, 2005 FN7462.0 ...
Page 7
... LOAD CURRENT (mA) FIGURE 11. LOAD REGULATION (V 1200 1000 800 600 400 200 (V) IN FIGURE 13. QUIESCENT CURRENT vs V FIGURE 15. RECOMMENDED MAXIMUM OUTPUT POWER vs INPUT VOLTAGE 7 ISL97702 (Continued) 18.29 18.28 18.27 18.26 18.25 18.24 18.23 100 150 = 3.6V) FIGURE 12. LINE REGULATION ( (CH1 = V FIGURE 14. TRANSIENT RESPONSE (V IN 3.2 2 ...
Page 8
... VDD through inductor and diode to the output load at V supply current in VDD is typically less than 0.1µA. When NEN is driven low the ISL97702 begins with the start- up sequence. Start-Up Sequence After pin NEN is pulled low or a restart is triggered from Fault Control during operation, the ISL97702 goes through a start- up sequence with the following six states: Soft Inrush -> ...
Page 9
... The input voltage at VDD, current in the VDDOUT switch, voltage at V and junction temperature Tj are OUT continuously monitored and can either restart the start-up sequence or in some cases disable the ISL97702 boost function as long as the fault is present. TABLE 1. FAULT PROTECTION FAULT FAULT ...
Page 10
... FIGURE 17. NSYNC TO LX SYNCHRONIZATION DELAY FIGURE 19. LX SYNCHRONIZATION WITH f(SYNC) = 1.4MHz 10 ISL97702 FIGURE 18. LX SYNCHRONIZATION WITH f(SYNC) = 600kHz FN7462.0 October 13, 2005 ...
Page 11
... Here a further power reduction can be achieved if the supply voltage for the display drivers is reduced according to the pixel diode characteristic. The ISL97702 allows selection between a nominal and a reduced output voltage level in order to supply more effectively OLED display drivers. Components Selection The input capacitance is normally 10µ ...
Page 12
... GND pin but with no sharing branch. Demo Board Layout FIGURE 21. OVERVIEW of DEMO BOARD 12 ISL97702 The heat of the IC is mainly dissipated through the thermal pad. Maximizing the copper area connected to the thermal pad is preferable. In addition, a solid ground plane is helpful for the EMI performance. ...
Page 13
... 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 13 ISL97702 FN7462.0 October 13, 2005 ...