EL7584 INTERSIL [Intersil Corporation], EL7584 Datasheet
EL7584
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EL7584 Summary of contents
Page 1
... An over-temperature feature is provided to allow the automatically protected from excessive power dissipation. The EL7584 is available in a 24-pin TSSOP package and is specified for operation over the full -40°C to +85°C temperature range. Pinout ...
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... Output Impedance O COM COM I (max) Output Current Limit COM PSRR Supply Voltage Rejection CMRR Common Mode Voltage Rejection 2 EL7584 = 25°C) Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C 18V Ambient Operating Temperature . . . . . . . . . . . . . . . .-40°C to +85°C 16.5V Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Curves = 12V 62kΩ 25° ...
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... V -EN Enable Input Low Threshold LO I(EN) Enable Input Bias Current OVER-TEMPERATURE PROTECTION T Over-temperature Threshold OT T Over-temperature Hysteresis HYS 3 EL7584 = 12V 62kΩ 25°C, Unless Otherwise Specified. (Continued) BOOST OSC A CONDITIONS ) ON input voltage (normally connected to V DDP Usually connected to V BOOST ...
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... VREF 23 ROSC 24 VSSB* NOTE: *VSSB, VSSC, VSSN, VSSP, and PGND (2) are shorted internally to the device substrate. 4 EL7584 PIN TYPE I Soft-Start input: a capacitor determines the current limit ramp time. I Voltage feedback input determines the value Starts internal power sequencing of V (See Applications Information) ; active HIGH input. ...
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... I (mA) OUT FIGURE 3. EFFICIENCY vs I 970 R 969 968 967 966 965 964 963 962 3 3.5 4 4.5 V (V) DDB FIGURE EL7584 5V 600 700 800 OUT 5V 600 700 800 OUT = 61.9kΩ OSC 1.265 1.255 5 5.5 6 DDB 95 90 12V 85 15V ...
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... I (mA) OUT FIGURE 9. LOAD REGULATION 12V DDP (mA) LOAD FIGURE 11 EL7584 (Continued) 12V 9V 500 600 700 OUT 9V 12V 500 600 700 OUT V = 15V DDP f=675kHz, V =3.3V IN 1.5 1.0 0.5 0.0 -0.5 15V -1 ...
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... 100K & 0.1µF DELAY NETWORK ON ENP, C 5V/DIV 10V/DIV 2V/DIV 200ms/DIV FIGURE 15. POWER-DOWN V =3.3V, V =11.3V, I =50mA IN OUT OUT FIGURE 17. LX WAVEFORM - DISCONTINUOUS MODE 7 EL7584 (Continued) 300 350 400 450 OSC =0.1µ BOOST OFF SWITCHING PERIOD(µs)=0.0118 R OSC ...
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... AMBIENT TEMPERATURE (°C) FIGURE 19. PACKAGE POWER DISSIPATION vs AMBIENT TEMPERATURE Functional Block Diagram FBB MAX_DUTY R OSC R 3 REFERENCE 62kΩ V GENERATOR REF V RAMP EN 8 EL7584 (Continued) 85 100 125 FIGURE 20 110kΩ 1 49Ω 13kΩ 0.1µF V DDB PWM COMPARATOR START-UP OSCILLATOR ...
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... Boost Converter The boost converter operates in constant frequency pulse- width-modulation (PWM) mode. Quiescent current for the EL7584 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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... Output Capacitor 1000 470 The EL7584 is specially compensated to be stable with 1000 370 capacitors which have a worst-case minimum value of 10µF at the particular V 1000 830 requirements also determine the minimum value and the type of capacitors ...
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... ON 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 below illustrates an implementation for two-stage positive charge pump circuit. 11 EL7584 OSC + - 40Ω FOR 12V ...
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... 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. 12 EL7584 V BOOST (5V-17V) C CPP C OUT1 FBP + - ) - 2 × ...
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... For longer pulses the V buffer supplies the COM current. By virtue of its high transconductance which progressively increases as more current is drawn, it can maintain regulation within 5mV as currents up to 50mA are drawn, while consuming only 1.5mA of quiescent current. 13 EL7584 5V-17V V LX ONP C CPN C ...
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... BOOST capacitor, the external load, and the boost’s current limit (controlled by the SS pin input.) Similarly, V voltage determined by the load capacitor, the V 14 EL7584 and the current capability of these negative charge pumps (which is rising as V rises.) 2. When V BOOST 1 ...
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... VIN 10µF GND V OFF 154kΩ 3.3µF **D 21 REFERENCE * MBRM120LT3 ** BAT54S *** C is optional if extended V delay is required EL7584 VSSB 24 0.1µF 2 FBB ROSC VREF VDDB PGND 21 C 49.9Ω 6 0.1µ PGND ...
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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 EL7584 FN7317.2 February 4, 2005 ...