ISL6224 Intersil Corporation, ISL6224 Datasheet
ISL6224
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ISL6224 Summary of contents
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... Data Sheet Single Output Mobile-Friendly PWM Controller The ISL6224 provides power control and protection for a single, adjustable output voltage required to power chip-sets and memory banks in high-performance notebooks and PDAs. This output voltage is adjustable in the range from 0.9–5.5V. The hysteretic or PWM controller regulates the output voltage from battery voltages ranging from 4V to 24V ...
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... Reference Voltage Accuracy Soft-Start Current During Start-up Soft-Start Threshold PWM CONVERTER Load Regulation VSEN pin bias current 2 ISL6224 Thermal Information Thermal Resistance (Typical, Note 1) SSOP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . Maximum Junction Temperature (Plastic Package .150 Maximum Storage Temperature Range . . . . . . . . . -65 Maximum Lead Temperature (Soldering 10s .300 ...
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... Lower Drive Pull-Down Resistance POWER GOOD AND CONTROL FUNCTIONS Power-Good Lower Threshold Power-Good Higher Threshold PGOOD Leakage Current PGOOD Voltage Low EN - Low (Off High (On) FCCM -Hysteretic Operation Enabled 3 ISL6224 5V Unless Otherwise Noted. (Continued SYMBOL TEST CONDITIONS ...
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Functional Block Diagram VIN VCC CLK FSET RAMP CLK POR EN SDWN REFERENCE REF AND SOFT SOFT START OUTPUT VOLTAGE MONITOR PGOOD GND FCCM HI POWER-ON SHUTOFF RESET (POR) GATE LOGIC POR DEADT PWM/HYST PWM ON LO HYST ON OC ...
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... This pin, when pulled to VCC, restrains hysteretic operation in light loads. General Description Operational Overview The ISL6224 is a single-channel PWM controller intended for chipset, DRAM, or other low voltage power needs of modern notebook and sub-notebook PCs. The IC integrates control circuits, and feedback compensation for a single synchronous buck converter. The output voltage is set in the range of 0.9– ...
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... As the filter inductor resumes continuous current, the PWM mode of operation is automatically restored. The ISL6224 control IC employs an average current mode control scheme with input voltage feedforward ramp programming for better rejection of input voltage variations. Current Sensing and Current Limit Protection ...
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... The other mechanism for changing from hysteretic to PWM is due to a sudden increase in the output current. This step load causes an instantaneous decrease in the output voltage 7 ISL6224 due to the voltage drop on the output capacitor ESR. If the decrease causes the output voltage to drop below the t hysteretic regulation level, the mode is changed to PWM on the next clock cycle ...
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... Given a sufficiently fast control loop design, the ISL6224 will provide either 0% or 94% duty cycle in response to a load transient. The response time is the time interval required to slew the inductor current from an initial current value to the load current level ...
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... The equations assume linear voltage-current transitions and do not model power loss due to the reverse-recovery of the lower MOSFET’s body diode. The gate-charge losses are dissipated by the ISL6224 and do not heat the MOSFETs. However, a large gate-charge increases the switching time, t MOSFET switching losses. Ensure that both MOSFETs are ...
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... AN9983 for the evaluation board component placement and the printed circuit board layout details. There are two sets of critical components in a DC/DC converter using an ISL6224 controller. The switching power components are the most critical because they switch large amounts of energy, and as such, they tend to generate equally large amounts of noise ...
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... ISL6224 DC-DC Converter Application Circuits Figure 5 shows an application circuit of a DC/DC converter for a notebook PC. The power supply provides +V2_5S from either +4V–24V battery voltage or system +5V bus. For DC detailed information on the circuit, including a bill of R2 OCSET TBD FCCM EN SOFT C4 0.015µF PGOOD FIGURE 5. APPLICATION CIRCUIT FOR ONE-STEP CONVERSION (MODE 1) ...
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... FIGURE 6. APPLICATION CIRCUIT FOR TWO-STEP 300 kHz CONVERSION (MODE 2) R2 OCSET 4 TBD FCCM 16 ISL6224 EN 3 SOFT 7 C2 0.015µF PGOOD GND VIN FIGURE 7. APPLICATION CIRCUIT FOR TWO-STEP 600kHz CONVERSION (MODE 3) 12 ISL6224 + C1 33µF CR1 VCC 11 BOOT 1/2 FDS6912A C4 UGATE 14 0.1µF PHASE 13 L1 6.4µH Risen ISEN ...
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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 13 ISL6224 M16.15A 16 LEAD SHRINK NARROW BODY SMALL OUTLINE PLASTIC PACKAGE ...