el7558b Intersil Corporation, el7558b Datasheet
el7558b
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el7558b Summary of contents
Page 1
... DC:DC switching regulator optimized for a 5V input and 1.0V-3.8V output. By combining integrated NMOS power FETS with a HSOP package the EL7558B can supply continuous output current without the use of external power devices or externally attached heat sinks, thereby minimizing design effort and overall system cost. ...
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... V VCC2DET, OUTEN Input High IH V VCC2DET, OUTEN Input Low IL V Powergood Drive High OH PWGD V Powergood Drive Low OL PWGD 2 EL7558B Output Pins . . . . . . . . . . . . . . .-0.3V below GND, +0.3V above VDD Operating Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . 135°C Peak Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5V 1nF 470pF OSC ...
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... I LX Output Leakage to VSS LEAK R Composite FET Resistance DSON R R Tempco DSONTC DSON t FET break before make delay BRM t High side FET minimum on time (LEB) LEB 3 EL7558B = 5V 1nF 470pF OSC SLOPE A CONDITIONS REF 0<I <100µA LOAD 10mA ...
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... A 3.53 I 3.52 OUT 3.51 3.50 3.49 I OUT 3.48 3.47 4.5 5.0 V (V) IN Line Regulation SLOPE OUT V =V =5.0V ±10 0.8 0.7 0.6 V =3.5V OUT 0.5 0.4 V =2.5V OUT 0.3 0.2 0.1 V =1V OUT 0 100 C SLOPE 4 EL7558B =4. =25°C A 5.5 6.5 7.5 8.0 3.54 3.53 3.52 =0.5A 3.51 I =4A OUT 3.50 3.49 =8A 3.48 3.47 3.46 5.5 =3A) T =25°C A 125 150 175 (pF) Efficiency =5.0 V) LOAD DD 100 V =3.5V OUT =2.5V OUT =1V ...
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... LOAD 1.5 1.0 V =1V 0.5 OUT 0.0 -0.5 V =2.5V OUT -1.0 -1.5 V =3.5V -2.0 OUT -2.5 -3 100 C SLOPE OSC OSC 10000 1000 100 100 C OSC 5 EL7558B (Continued) T =25°C A 125 150 175 (pF) T =25°C A 125 150 175 (pF) T =25°C A 1000 100000 (pF) Load Regulation vs C SLOPE I =0 OUT 0.8 0.7 0.6 0.5 V =4.5A IN 0.4 V = ...
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... T =25° OUTEN = OSC OSC 2 =5V DD 1.5 V 1.0 10 100 F OSC 6 EL7558B (Continued) =5.5V =4.5V V =5V DD Continuous Mode (kHz) V =5. =4.5V DD (kHz) =5.5V DD =4.5V DD 1000 (kHz OSC 16 T =25° =5.5V OUTEN ...
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... S 11 VSSP S 12 VSSP S 13 VCC2DET I 14 OUTEN PWRGD O 17 TEST I 18 VSSP S 19 VSSP EL7558B (Continued) Minimum Output Voltage vs F OSC 2.3 T =120°C J 2.1 V =5.5V DD 1.9 1.7 V =5V DD 1.5 1.3 V =4.5V DD 1.1 0.9 0.7 200 400 600 800 F (kHz) OSC Voltage feedback pin for the buck regulator. Active when VCC2DET is logic low. Normally connected to external resistor divider between VOUT and GND. A 2µ ...
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... S + COSC, Pin EL7558B Same as pin 20. Same as pin 20. Same as pin 20. Gate drive to high-side driver. Bootstrapped from LX with a 0.1µF capacitor. Ground return for the control circuitry. Connected to voltage doubler output. Supplies gate drive to the low-side driver. Drives the negative side of charge pump capacitor at one-half the oscillator frequency F Voltage feedback pin ...
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... In the continuous mode of operation the low-side switch will remain on until the end of the oscillator period. In order to improve the low current efficiency of the EL7558B, a zero- crossing comparator senses when the inductor transitions through zero. Turning off the low-side switch at zero inductor ...
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... FET, via the VHI pin. Reference A 1% temperature compensated band gap reference is integrated in the EL7558B. The external CREF capacitor acts as the dominant pole of the amplifier and can be increased in size to maximize transient noise rejection. A value of 0.1uF is recommended. ...
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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 11 EL7558B ...