DATASHEET ISL8112 FN6396 Rev 1.00 High Light-Load Efficiency, Dual-Output, Main Power Supply Controllers August 10, 2010 ISL8112 is a dual-output Synchronous Buck controller with 2A Features integrated driver. It features high light load efficiency which is Wide Input Voltage Range 5.5V to 25V especially preferred in systems concerned with high efficiency in wide load range, like the battery powered system. ISL8112 Constant ON-TIME Control with 100ns Load-Step includes two constant on-time PWM controllers. Either of the Response two outputs can operate in output fixed mode or adjustable Dual Fixed Outputs of 1.05V (3.3V) and 1.5V (5.0V), or mode. In fixed mode, one output can be 5V or 3.3V and the Adjustable Outputs of 0.7V to 5.5V (SMPS1) and 0V to other can output 1.5V or 1.05V. In output adjustable mode, 2.5V/5V (SMPS2), 1.5% Accuracy one output can be 0.7V to 5.5V, and the other output can Adjustable Switching Frequency: 400/500kHz, range from 0V to 2.5V (sensing output voltage directly) or up 300/400kHz, 200/300kHz to 5V (using resistor divider voltage for voltage sensing). This device also features a linear regulator providing 3.3V/5V, or Very High Light Load Efficiency (Skip Mode) adjustable from 0.7V to 4.5V via LDOREF. The linear 5mW Quiescent Power Dissipation regulator provides up to 100mA output current with automatic 1.5% (LDO): 100mA, 200mA (Switch Over) linear-regulator bootstrapping to the BYP input. When in switch over, the LDO output can source up to 200mA. 3.3V Reference Voltage 2.0%: 5mA ISL8112 includes on-board power-up sequencing, the power- 2.0V Reference Voltage 1.0%: 50A good (PGOOD ) outputs, digital soft-start, and internal soft- stop output discharge that prevents negative voltages on Temperature Compensated r Current Sensing DS(ON) shutdown. Programmable Current Limit with Foldback Capability ISL8112 is implemented with constant on-time PWM control Selectable PWM, Skip or Ultrasonic Mode scheme which need no sense resistors and provides 100ns Independent PGOOD1 and PGOOD2 Comparators response to load transients while maintaining a relatively constant switching frequency. The unique ultrasonic pulse- Soft-Start with Pre-Biased Output and Soft-Stop skipping mode maintains the switching frequency above 1.7ms Digital Soft-Start and Independent Shutdown 25kHz, eliminating undesired audible noises in low frequency operation at light load. Other features include pulse skipping Independent ENABLE which maximizes efficiency in light-load applications, and Thermal Shutdown fixed-frequency PWM mode which reduces RF interference in Extremely Low Components Count sensitive applications. Pb-Free Available (RoHS Compliant) Ordering Information PART TEMP. Applications NUMBER PART RANGE PKG. (Note) MARKING (C) PACKAGE DWG. Power Supply for Telecom/Datacom and POL ISL8112IRZ* ISL8112 IRZ -40 to +100 32 Ld QFN L32.5x5B System Requiring High Efficiency in Wide Load Range (Pb-free) Compact Design with Minimum Components Count *Add -T suffix for tape and reel. Please refer to TB347 for details on reel specifications. PDAs and Mobile Communication Devices NOTE: These Intersil Pb-free plastic packaged products employ 3- and 4-Cell Li+ Battery-Powered Devices special Pb-free material sets, molding compounds/die attach materials, and 100% matte tin plate plus anneal (e3 termination finish, which is DDR1, DDR2, and DDR3 Applications RoHS compliant and compatible with both SnPb and Pb-free soldering operations). Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020. FN6396 Rev 1.00 Page 1 of 27 August 10, 2010ISL8112 Pinout ISL8112 (32 LD 5X5 QFN) TOP VIEW 32 31 30 29 28 27 26 25 VREF1 BOOT2 1 24 FS 2 23 LG2 VCC PGND 3 22 EN LDO GND 4 21 VREF2 5 20 NC VIN PVCC 6 19 LDO 7 18 LG1 LDOREF BOOT1 8 17 9 1011 12 13 1415 16 FN6396 Rev 1.00 Page 2 of 27 August 10, 2010 BYP OUT2REF VSEN1 ILIM2 FB1 VSEN2 ILIM1 MODE PGOOD1 PGOOD2 EN1 EN2 UG1 UG2 PH1 PH2