DATASHEET ISL6236A FN6453 Rev 3.00 High-Efficiency, Quad-Output, Main Power Supply Controllers for Notebook March 18, 2008 Computers The ISL6236A dual step-down, switch-mode power-supply Features (SMPS) controller generates logic-supply voltages in Wide Input Voltage Range 4.5V to 25V battery-powered systems. The ISL6236A includes two pulse-width modulation (PWM) controllers, 5V/3.3V and Dual Fixed 1.05V/3.3V and 1.5V/5.0V Outputs or 1.5V/1.05V. The output of SMPS1 can also be adjusted from Adjustable 0.7V to 5.5V (SMPS1) and 0V to 2.5V (SMPS2), 1.5% Accuracy 0.7V to 5.5V. The SMPS2 output can be adjusted from 0V to 2.5V by setting REFIN2 voltage. An optional external charge Secondary Feedback Input (Maintains Charge Pump pump can be monitored through SECFB. This device features Voltage) a linear regulator providing 3.3V/5V, or adjustable from 0.7V to 1.7ms Digital Soft-Start and Independent Shutdown 4.5V output via LDOREFIN. The linear regulator provides up to 100mA output current with automatic linear-regulator Fixed 3.3V/5.0V, or Adjustable Output 0.7V to 4.5V, bootstrapping to the BYP input. When in switchover, the LDO 1.5% (LDO): 200mA output can source up to 200mA. The ISL6236A includes 3.3V Reference Voltage 2.0%: 5mA on-board power-up sequencing, the power-good (POK) 2.0V Reference Voltage 1.0%: 50A outputs, digital soft-start, and internal soft-stop output discharge that prevents negative voltages on shutdown. Constant ON-TIME Control with 100ns Load-Step Response A constant on-time PWM control scheme operates without sense resistors and provides 100ns response to load Frequency Selectable transients while maintaining a relatively constant switching r Current Sensing DS(ON) frequency. The unique ultrasonic pulse-skipping mode Programmable Current Limit with Foldback Capability maintains the switching frequency above 25kHz, which eliminates noise in audio applications. Other features include Selectable PWM, Skip or Ultrasonic Mode pulse skipping, which maximizes efficiency in light-load BOOT Voltage Monitor with Automatic Refresh applications, and fixed-frequency PWM mode, which reduces RF interference in sensitive applications. Independent POK1 and POK2 Comparators Ordering Information Soft-Start with Pre-Biased Output and Soft-Stop PART TEMP Independent ENABLE NUMBER PART RANGE PACKAGE PKG. High Efficiency - up to 97% (Note) MARKING (C) (Pb-free) DWG. ISL6236AIRZ ISL6236 AIRZ -40 to +100 32 Ld 5x5 QFN L32.5x5B Very High Light Load Efficiency (Skip Mode) ISL6236AIRZ-T* ISL6236 AIRZ -40 to +100 32 Ld 5x5 QFN L32.5x5B 5mW Quiescent Power Dissipation (Tape and Reel) Thermal Shutdown *Please refer to TB347 for details on reel specifications. Extremely Low Component Count NOTE: These Intersil Pb-free plastic packaged products employ special Pb-free material sets molding compounds/die attach materials and 100% Pb-Free (RoHS Compliant) matte tin plate PLUS ANNEAL - e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Applications Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC Notebook and Sub-Notebook Computers J STD-020. PDAs and Mobile Communication Devices 3-Cell and 4-Cell Li+ Battery-Powered Devices DDR1, DDR2, and DDR3 Power Supplies Graphic Cards Game Consoles Telecommunications FN6453 Rev 3.00 Page 1 of 37 March 18, 2008ISL6236A Pinout ISL6236A (32 LD 5x5 QFN) TOP VIEW 32 31 30 29 28 27 26 25 REF 1 24 BOOT2 TON LGATE2 2 23 VCC 3 22 PGND EN LDO GND 4 21 VREF3 5 20 SECFB VIN 6 19 PVCC LDO LGATE1 7 18 LDOREFIN BOOT1 8 17 9 1011 12 13 1415 16 FN6453 Rev 3.00 Page 2 of 37 March 18, 2008 BYP REFIN2 OUT1 ILIM2 FB1 OUT2 ILIM1 SKIP POK1 POK2 EN1 EN2 UGATE1 UGATE2 PHASE1 PHASE2