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6225CA Dataheets PDF



Part Number 6225CA
Manufacturers Intersil Corporation
Logo Intersil Corporation
Description ISL6225CA
Datasheet 6225CA Datasheet6225CA Datasheet (PDF)

www.DataSheet4U.com ® ISL6225 Data Sheet September 2003 FN9049.4 Dual Mobile-Friendly PWM Controller with DDR Memory Option The ISL6225 dual PWM controller delivers high efficiency and tight regulation from two voltage regulating synchronous buck DC/DC converters. The ISL6225 PWM power supply controller was designed especially for DDR DRAM, SDRAM, and graphic chipset applications in high performance desknote PCs, notebook PCs, sub-notebook PCs, and PDAs. Automatic mode selection of constant-f.

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www.DataSheet4U.com ® ISL6225 Data Sheet September 2003 FN9049.4 Dual Mobile-Friendly PWM Controller with DDR Memory Option The ISL6225 dual PWM controller delivers high efficiency and tight regulation from two voltage regulating synchronous buck DC/DC converters. The ISL6225 PWM power supply controller was designed especially for DDR DRAM, SDRAM, and graphic chipset applications in high performance desknote PCs, notebook PCs, sub-notebook PCs, and PDAs. Automatic mode selection of constant-frequency synchronous rectification at heavy load, and hysteretic diode-emulation at light load, assure high efficiency over a wide range of conditions. The hysteretic mode of operation can be disabled separately on each PWM converter if constant-frequency continuous-conduction operation is desired for all load levels. Efficiency is further enhanced by using the lower MOSFET RDS(ON) as the current sense element. Voltage-feed-forward ramp modulation, average current mode control, and internal feedback compensation provide fast response to input voltage and output load transients. Input current ripple is minimized by channel to channel PWM phase shift of 0°, 90°, or 180° determined by input voltage and status of the DDR pin. The ISL6225 can control two independent output voltages adjustable from 0.9V to 5.5V or, by activating the DDR pin, transform into a complete DDR memory power supply solution. In DDR mode, CH2 output voltage VTT tracks CH1 output voltage VDDQ. CH2 output can both source and sink current, an essential power supply feature for DDR memory systems. The reference voltage VREF required by DDR memory is generated as well. In dual power supply applications the ISL6225 monitors the output voltage of both CH1 and CH2. An independent PGOOD (power good) signal is asserted for each channel after the soft-start sequence has completed, and the output voltage is within ±10% of the set point. In DDR mode CH1 generates the only PGOOD signal. Built-in over-voltage protection prevents the output from going above 115% of the set point by holding the lower MOSFET on and the upper MOSFET off. When the output voltage decays below the over-voltage threshold, normal operation automatically resumes. Once the soft-start sequence has completed, under-voltage protection may latch the ISL6225 off if either output drops below 75% of its set point value. Adjustable over-current protection (OCP) monitors the voltage drop across the RDS(ON) of the lower MOSFET. If more precise current-sensing is required, an external current sense resistor may be used. Features • Provides regulated output voltage in the range of 0.9V-5.5V - High efficiency over wide load range - Synchronous buck converter with hysteretic operation at light load - Inhibit Hysteretic mode on one, or both channels • Complete DDR memory power solution - VTT tracks VDDQ/2 - VDDQ/2 buffered reference output • No current-sense resistor required - Uses MOSFET RDS(ON) - Optional current-sense resistor for precision Over-Current • Under-voltage lock-out on VCC pin • Dual input voltage mode operation - Operates directly from battery 5V to 24V input - Operates from 3.3V or 5V system rail - VCC from 5V only • Excellent dynamic response - Combined voltage feed-forward and average current mode control • Power-good signal for each channel • 300kHz switching frequency - 180° channel to channel phase operation for reduced input ripple when not in DDR mode - 0° channel to channel phase operation in DDR mode for reduced channel interference - 90° channel to channel phase operation for reduced input ripple in DDR mode when VIN is at GND. Applications • Mobile PCs • PDAs • Hand-held portable instruments Pinout ISL6225 SSOP-28 TOP VIEW GND 1 LGATE1 2 PGND1 3 PHASE1 4 UGATE1 5 BOOT1 6 ISEN1 7 EN1 8 VOUT1 9 28 VCC 27 LGATE2 26 PGND2 25 PHASE2 24 UGATE2 23 BOOT2 22 ISEN2 21 EN2 20 VOUT2 19 VSEN2 18 OCSET2 17 SOFT2 16 PG2/REF 15 PG1 Ordering Information PART NUMBER ISL6225CA ISL6225CA-T TEMP. (oC) -10 to 85 -10 to 85 PACKAGE 28 Ld SSOP 28 Ld SSOP Tape and Reel PKG. NO. M28.15 M28.15 VSEN1 10 OCSET1 11 SOFT1 12 DDR 13 VIN 14 1 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. 2003. All Rights Reserved All other trademarks mentioned are the property of their respective owners. www.DataSheet4U.com Absolute Maximum Ratings ISL6225 Thermal Information Thermal Resistance (Typical, Note 2) Bias Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . + 6.5V Input Voltage, VIN. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +27.0V PHASE, UGATE Voltage. . . . . . . . . . . . . . . . GND-5V (Note1) to 33V BOOT, ISEN Voltage. . . . . . . . . . . . . . . . . . . . . GND-0.3V to +33.0V BOOT with respect to PHASE. . . . . . . . . . . . . . . . . . . . . . . . . + .


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