ISL8112 High Light-Load Efficiency, Dual-Output, Main Power Supply Controllers

VIN (min) (V)	4.5
VIN (max) (V)	25
VOUT (min) (V)	0.7
VOUT (max) (V)	5.5
IOUT (max) (A)	30

ISL8112 is a dual-output Synchronous Buck controller with 2A integrated driver. It features high light load efficiency which is especially preferred in systems concerned with high efficiency in wide load range, like the battery powered system. ISL8112 includes two constant on-time PWM controllers. Either of the two outputs can operate in output fixed mode or adjustable mode. In fixed mode, one output can be 5V or 3.3V and the other can output 1.5V or 1.05V. In output adjustable mode, one output can be 0.7V to 5.5V, and the other output can range from 0V to 2.5V (sensing output voltage directly) or up to 5V (using resistor divider voltage for voltage sensing). This device also features a linear regulator providing 3.3V/5V, or adjustable from 0.7V to 4.5V via LDOREF. The linear regulator provides up to 100mA output current with automatic linear-regulator bootstrapping to the BYP input. When in switch over, the LDO output can source up to 200mA. ISL8112 includes on-board power-up sequencing, the powergood (PGOOD_) outputs, digital soft-start, and internal softstop output discharge that prevents negative voltages on shutdown.

ISL8112 is implemented with constant on-time PWM control scheme which need no sense resistors and provides 100ns response to load transients while maintaining a relatively constant switching frequency. The unique ultrasonic pulseskipping mode maintains the switching frequency above 25kHz, eliminating undesired audible noises in low frequency operation at light load. Other features include pulse skipping which maximizes efficiency in light-load applications, and fixed-frequency PWM mode which reduces RF interference in sensitive applications.

ISL8112 特点

Wide Input Voltage Range 5.5V to 25V
Constant ON-TIME Control with 100ns Load-Step Response
Dual Fixed Outputs of 1.05V (3.3V) and 1.5V (5.0V), or Adjustable Outputs of 0.7V to 5.5V (SMPS1) and 0V to 2.5V/5V (SMPS2), ±1.5% Accuracy
Adjustable Switching Frequency: 400/500kHz, 300/400kHz, 200/300kHz
Very High Light Load Efficiency (Skip Mode)
5mW Quiescent Power Dissipation
±1.5%(LDO): 100mA, 200mA(Switch Over)
3.3V Reference Voltage ±2.0%: 5mA
2.0V Reference Voltage ±1.0%: 50μA
Temperature Compensated rDS(ON) Current Sensing
Programmable Current Limit with Foldback Capability
Selectable PWM, Skip or Ultrasonic Mode
Independent PGOOD1 and PGOOD2 Comparators
Soft-Start with Pre-Biased Output and Soft-Stop
1.7ms Digital Soft-Start and Independent Shutdown
Independent ENABLE
Thermal Shutdown
Extremely Low Components Count
Pb-Free Plus Anneal Available (RoHS Compliant)

ISL8112 应用

Power Supply for Telecom/Datacom and POL
System Requiring High Efficiency in Wide Load Range
Compact Design with Minimum Components Count
PDAs and Mobile Communication Devices
3- and 4-Cell Li+ Battery-Powered Devices
DDR1, DDR2, and DDR3 Applications

ISL8112 芯片订购指南

芯片型号	产品状态	温度范围	封装尺寸图	潮湿敏感度等级MSL	美元价格US $
ISL8112IRZ	量产	工业级	32 Ld QFN	3	2.31
ISL8112IRZ-T	量产	工业级	32 Ld QFN T+R	3	2.31