el7581 Intersil Corporation, el7581 Datasheet
el7581
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el7581 Summary of contents
Page 1
... V control to allow selection of supply start-up sequence. An over-temperature feature is provided to allow the automatically protected from excessive power dissipation. The EL7581 is available HTSSOP package and is specified for operation over the full -40°C to +85°C temperature range. Ordering Information ...
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... Feedback Input Bias Current I(DRVP) RMS DRVP Output Current ILR_V Load Regulation ON F Charge Pump Frequency PUMP 2 EL7581 Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C Die Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125°C Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Curves Operating Ambient Temperature . . . . . . . . . . . . . . . .-40°C to +85° 12V 100kΩ ...
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... Logic Low Bias Current IL(ENBN) Logic High Bias Current IL(ENP) Logic High Bias Current OVER-TEMPERATURE PROTECTION T Over-temperature Threshold OT T Over-temperature Hysteresis HYS 3 EL7581 = 12V 100kΩ 25°C Unless Otherwise Specified. (Continued) BOOST A OSC CONDITIONS ) OFF input voltage (normally connected to V DDN Usually connected to V ...
Page 4
... VREF 18 ENBN 19 ENP 20 ROSC 4 EL7581 S Ground for DC/DC boost and reference circuits; chip substrate I Soft-start input; the capacitor connected to this pin sets the current limited start time I Voltage feedback input for boost circuit; determines boost output voltage Positive supply input for DC/DC boost circuits ...
Page 5
... I (mA) OUT FIGURE 3. EFFICIENCY 1.5 1 0.5 0 -0.5 15V -1 9V 12V -1 250 450 650 I (mA) OUT FIGURE 5. LOAD REGULATION 5 EL7581 9V 12V 15V 800 1K OUT 9V 12V 800 1K OUT 1MHz S 5V 850 1050 12V 15V ...
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... ON f(MHz) = 1/(0.0118 R + 0.378) OSC 1400 1200 1000 800 600 400 200 100 150 200 250 R (kΩ) OSC FIGURE 11 EL7581 (Continued 3. 700kHz S 5V 850 1050 = 15V DDP 300 350 400 450 OSC ...
Page 7
... IN BOOST (10V/DIV) ∆V BOOST (20mV/DIV) 0.5µs/DIV FIGURE 15. BOOST STAGE I = 18mA 18V 2.2µ 50mV/DIV 2µs/DIV FIGURE 17. V RIPPLE ON 7 EL7581 (Continued) 1.265 1.255 5 5.5 6 DDB = 22µF BOOST 50mV/DIV 20mV/DIV 1.27 1.26 1.25 - 100 TEMPERATURE (°C) FIGURE 14 TEMPERATURE REF I = 5mA 18V 2.2µ ...
Page 8
... V IN 2V/DIV I IN 0.5A/DIV 1ms/DIV FIGURE 21. START-UP VOLTAGE AND CURRENT C = 0.1µF SS 5V/DIV 10V/DIV 2V/DIV 1ms/DIV FIGURE 23. POWER-UP, NO DELAY RC NETWORK ON ENABLE PINS 8 EL7581 (Continued ∆V O (100mV/DIV) FIGURE 20. BOOST CONVERTER TRANSIENT RESPONSE V IN 2V/DIV I IN 0.5A/DIV FIGURE 22. START-UP VOLTAGE AND CURRENT ...
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... THICKNESS AND 1-oz COPPER ON BOTH SIDES PCB AREA (in FIGURE 29. 20-PIN HTSSOP THERMAL RESISTANCE vs PCB AREA, NO AIR FLOW 9 EL7581 (Continued) V BOOST OFF FIGURE 26. POWER-UP, 100K AND 0.1µF DELAY NETWORK FIGURE 30. PACKAGE POWER DISSIPATION vs AMBIENT C = 0.1µF SS ...
Page 10
... Typical Performance Curves FIGURE 31. PACKAGE POWER DISSIPATION vs AMBIENT TEMPERATURE Block Diagram FBB MAX_DUTY R OSC REFERENCE R 3 GENERATOR 62kΩ V REF V RAMP ENBN 10 EL7581 (Continued) JEDEC JESD51-3 LOW EFFECTIVE THERMAL CONDUCTIVITY TEST BOARD 1 0.9 800mW 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0 100 AMBIENT TEMPERATURE (°C) V OUT ...
Page 11
... Boost Converter The boost converter operates in constant frequency pulse- width-modulation (PWM) mode. Quiescent current for the EL7581 is only 5mA when enabled, and since only the low side MOSFET is used, switch drive current is minimized. 90% efficiency is achieved in most common application operating conditions. ...
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... EL7581 Elantec demo board, MBRM120 is selected. Its forward voltage drop is 450mV at 1A forward current. Output Capacitor The EL7581 is specially compensated to be stable with . L capacitors which have a worst-case minimum value of 10µF at the particular V requirements also determine the minimum value and the type of capacitors ...
Page 13
... If additional stage is required, the LX switching signal is recommended to drive the additional charge pump diodes. The drive impedance at the LX switching is typically 150mΩ. The figure on the next page illustrates an implementation for two-stage positive charge pump circuit. 13 EL7581 OSC + - 40Ω for 17V ...
Page 14
... OFF OUT ONN ONP Similar to positive charge pump, if additional stage is required, the LX switching signal is recommended to drive the additional charge pump diodes. The figure on the next page shows a two stage negative charge pump circuit. 14 EL7581 V BOOST (5V-17V) C CPP C OUT1 FBP + - ) - 2 × ...
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... Locate feedback dividers close to their respected feedback pins to avoid switching noise coupling into the high impedance node. • Place the charge pump feedback resistor network after the diode and output capacitor node to avoid switching noise. 15 EL7581 5V-17V V LX ONP C CPN ...
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... OPEN 22µF 500mA 10µF 4.7µF GND V OFF (-6V@ 15mA 154K 0.1µF 3.3µ MBRM120LT3 ** BAT54S 16 EL7581 VSSB ROSC ENP 2 0.1µF FBB ENBN VDDB VREF 4 C 49.9 6 0.1µF LX PGND 5 D1* LX PGND DRVP 7 10µH ...
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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 17 EL7581 ...