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Details, datasheet, quote on part number:ISL6224CA-T
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ISL6224
D a t a Sheet M ay 2002 F N90 42. 4
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 0.95.5V. The hysteretic or PWM controller regulates the output voltage from battery voltages ranging from 4V to 24V. Synchronous rectification and hysteretic operation at light loads contribute to a high efficiency over a wide range of input voltages and loads. Efficiency is even further enhanced by using MOSFET's RDS(ON ) as a current sense component. Feed-forward ramp modulation, average current mode control and internal feed-back compensation provide fast and firm handling of transients when powering advanced chip sets. Two-stage conversion using system 5V voltage is possible at a higher frequency (600kHz) to minimize the output filter size. The ISL6224 monitors the output voltage. A PGOOD (power good) signal is issued when soft start is completed and the output is within ±10% of the set point. A built-in overvoltage protection prevents output voltage from going above 120% of the set point. Undervoltage protection latches the chip off when the output drops below 70% of its setting value after soft-start sequence is completed. The PWM controller's overcurrent circuitry monitors the output current by sensing the voltage drop across the lower MOSFET. If higher precision sense technique is required, an optional external current-sense resistor may be used.
Features
· Adjustable output voltgage: 0.95.5V · High efficiency over wide load range - Higher efficiency in hysteretic mode at light load · Lossless current sense scheme - Uses MOSFET's RDS(ON ) - Optional current sense method higher precision · Supply operation mode - Wide VIN range: 4V24V - Single 5V system rail · Input undervoltage lock-out on VCC pin(UVLO) · Excellent dynamic response - Combined voltage feed-forward and current mode control · Power-Good indicator · 300/600kHz switching frequency · Thermal shut-down
Applications
· M obile PCs · Graphic cards · Hand-held portable instruments
Related Literature
· Application Note AN9983
Ordering Information
PART NUMBER ISL6224CA TEMP. (oC ) -10 to 85 P ACKAGE 16 Ld SSOP PKG. NO. M16.15A
ISL6224 (SSOP)
VIN PGOOD EN OCSET VOUT VSEN SOFT G ND 1 2 3 4 5 6 7 8 16 15 14 13 FCCM BOOT UGATE PHASE
12 ISEN 11 VCC 10 LGATE 9 PGND
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CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright © Intersil Americas Inc. 2002. All Rights Reserved
ISL6224
Absolute Maximum Ratings
Bias Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +7V Input Voltage, Vin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +27.0V Phase and Isen Pins . . . . . . . . . . . . . . . . . . . . . GND -0.3V to +29.0V BOOT and Ugate Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . + 32.0V BOOT with respect to PHASE . . . . . . . . . . . . . . . . . . . . . . . . . .+ 7.0V All other pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . GND -0.3V to 15V ESD Classification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Class 2
Thermal Information
Thermal Resistance (Typical, Note 1) JA ( oC/W) SSOP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112 Maximum Junction Temperature (Plastic Package) . . . . . . . .150oC Maximum Storage Temperature Range . . . . . . . . . -65oC to 150oC Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . . 300oC (SSOP - Lead Tips Only)
Recommended Operating Conditions
Bias Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +5.0V ±5% Input Voltage, Vin . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.0V to +24.0V Ambient Temperature Range. . . . . . . . . . . . . . . . . . . -10oC to 85oC Junction Temperature Range . . . . . . . . . . . . . . . . . -10oC to 125oC
CAUTION: Stresses above those listed in "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
NOTE: 1. JA is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief TB379 for details. Electrical Specifications PARAMETER VC C SUPPLY Bias Current Shutdown Current VC C UVLO Rising Vcc Threshold Falling Vcc Threshold Vcc UVLO Hysteris VIN Input Voltage Pin Current (Sink) Input Voltage Pin Current (Source) Shutdown Current OSCILLATOR PWM Oscillator Frequency PWM Oscillator Frequency Ramp Amplitude, pk-pk Ramp Amplitude, pk-pk Ramp Offset RE FERENCE AND SOFT START Internal Reference Voltage Reference Voltage Accuracy Soft-Start Current During Start-up Soft-Start Threshold PWM CONVERTER Load Regulation VS EN pin bias current IVSEN 0.0mA < IVOUT1 < 3.0A; 5.0V < VIN < 24.0V - 1.0 80 +1.0 % nA ISOFT VSOFT VREF - 1.0 0.9 5 1.5 +1.0 V % µA V Fc1 Fc2 VR1 VR2 VROFF VIN=3.5V -- 24V VIN 0.5V VIN= 16V, By Design VIN5V, By Design 255 510 300 600 2 1.25 0.5 345 690 k Hz k Hz V V V IVIN IVIN IVIN VIN pin connected to the input voltage source VIN pin connected to ground 10 -7 20 -1 5 30 -2 0 1 µA µA µA 4.3 4.1 0.1 4.75 4.5 0.5 V V V ICC ICCSN LGATE, UGATE Open, VSEN forced above regulation point 850 5 1.3µA 15 µA µA Operating Conditions: VCC = 5V, TA = 10oC to 85oC, Unless Otherwise Noted. SYMBOL TEST CONDITIONS MIN TYP M AX UNITS
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ISL6224
Electrical Specifications PARAMETER VOUT pin input impedance Undervoltage Shutdown Level Overvoltage Protection PWM CONTROLLER GATE DRIVERS Upper Drive Pull-Up Resistance Upper Drive Pull-Down Resistance Lower Drive Pull-Up Resistance 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) EN - High (On) FCCM -Hysteretic Operation Enabled VPGVPG+ IPGLKG Fraction of the set point; ~3µs noise filter Fraction of the set point; ~3µs noise filter VPULLUP = 5.5V IPGOOD = -4mA -1 4 10 2.0 Vcc/2 -8 15 1 0.5 0.8 % % µA V V V V R2UGPUP R2UGPDN R2LGPUP R2LGPDN 8 3.2 8 1.5 15 5 15 2.4 Operating Conditions: VCC = 5V, TA = 10oC to 85oC, Unless Otherwise Noted. (Continued) SYMBOL IVOUT VUV1 VOVP1 Fraction of the set point; ~3µs noise filter Fraction of the set point; ~1µs noise filter TEST CONDITIONS MIN 40 70 113 TYP 55 M AX 65 80 120 UNITS kOhm % %
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