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EL7583IREZ Datasheet(PDF) 13 Page - Renesas Technology Corp |
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EL7583IREZ Datasheet(HTML) 13 Page - Renesas Technology Corp |
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13 / 16 page  EL7583 FN7335 Rev 5.00 Page 13 of 16 May 12, 2006 Two-Stage Negative Charge Pump Circuit The maximum VOFF output voltage for N+1 stage charge pump is: R21 and R22 determine VOFF output voltage: where VREF is 1.310V. Over-Temperature Protection An internal temperature sensor continuously monitors the die temperature. In the event that die temperature exceeds the thermal trip point, the device will shut down and disable itself. The upper and lower trip points are typically set to 130°C and 90°C respectively. PCB Layout Guidelines Careful layout is critical in the successful operation of the application. The following layout guidelines are recommended to achieve optimum performance. •VREF and VDDB bypass capacitors should be placed next to the pins. • Place the boost converter diode and inductor close to the LX pins. • Place the boost converter output capacitor close to the PGND pins. • Locate feedback dividers close to their respected feedback pins to avoid switching noise coupling into the high impedance node. • Switching output PCB traces should not cross, or be laid out adjacent to, feedback traces without using a grounded shielding trace or layer. This is to prevent undesirable switching interactions coupling into the feedback inputs. • Place the charge pump feedback resistor network after the diode and output capacitor node to avoid switching noise. • All low-side feedback resistors should be connected directly to VSSB. VSSB should be connected to the power ground close at one point only. A demo board is available to illustrate the proper layout implementation. - + VSSN DRVN FBN VDDN CCPN COUT2 VLX COUT2 R21 R22 CCPN VREF VOFF 5V-17V RONN RONP VOFF max IOUT 2RONN RONP 2VDIODE - IOUT 1 0.5 FS CCPN -------------------------------------------- ++ - IOUT 1 0.5 FS COUT2 ------------------------------------------------ - VDDN - N VLX max N2 VDIODE IOUT 1 0.5 FS CCPN -------------------------------------------- + + IOUT 1 0.5 FS COUT2 ------------------------------------------------ + VOFF -VREF R21 R22 ---------- = |
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