ISL6244 Multiphase PWM Controller

The ISL6244 provides core-voltage regulation by driving 2 to 4 interleaved synchronous-rectified buck-converter channels in parallel. Interleaving the channel timing results in increased ripple frequency which reduces input and output ripple currents. The reduction in ripple results in lower component cost, reduced dissipation, and a smaller implementation area.

The ISL6244 uses cost and space-saving rDS(ON) sensing for channel current balance, active voltage positioning, and over-current protection. Output voltage is monitored by an internal differential remote sense amplifier. A high-bandwidth error amplifier drives the output voltage to match the programmed 5-bit DAC reference voltage. The resulting compensation signal guides the creation of pulse width modulated (PWM) signals to control companion Intersil MOSFET drivers. The OFS pin allows direct offset of the DAC voltage from 0V to 100mV using a single external resistor. The entire system is trimmed to ensure a system accuracy of ±1%.

Outstanding features of this controller IC include Dynamic VIDTM technology allowing seamless on-the-fly VID changing without the need of any external components. Battery "feed-forward" is provided to allow for traditional control schemes over total input voltage variation. Output voltage "droop" or active voltage positioning is optional. When employed, it allows the reduction in size and cost of the output capacitors required to support load transients. A threshold-sensitive enable input allows the use of an external resistor divider for start-up coordination with Intersil MOSFET drivers or any other devices powered from a separate supply.

Superior over-voltage protection is achieved by gating on the lower MOSFET of all phases to reduce the output voltage. Under-voltage conditions are detected, but PWM operation is not disrupted. Over-current conditions cause a hiccupmode response as the controller repeatedly tries to restart. After a set number of failed startup attempts, the controller latches off. A power good logic signal indicates when the converter output is between the UV and OV thresholds.

ISL6244 特点

Multiphase Power Conversion
- 2, 3 or 4 Phase Operation
Active Channel Current Balancing
Precision rDS(ON) Current Sharing
- Lossless
- Low Cost
Precision CORE Voltage Regulation
- Differential Remote Output Voltage Sensing
- Programmable Reference Offset
- ±1% System Accuracy
Microprocessor Voltage Identification Input
- 5-Bit VID Input
- 0.800V to 1.550V in 25mV Steps
- Dynamic VID Technology
Programmable Droop Voltage
Excellent Dynamic Response
- Combined Input Voltage Feed-Forward and Pulse-by- Pulse Average Current Mode
Over Current Protection
Digital Soft Start
Threshold Sensitive Enable Input
High Ripple Frequency (160kHz to 4MHz)
QFN Package:
- Compliant to JEDEC PUB95 MO-220 QFN - Quad Flat No Leads - Package Outline
- Near Chip Scale Package footprint, which improves PCB efficiency and has a thinner profile
Pb-Free Available (RoHS Compliant)

ISL6244 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 $
ISL6244CRZ	量产	民用级	32 Ld QFN	2	2.78
ISL6244CRZ-T	量产	民用级	32 Ld QFN T+R	2	2.84
ISL6244EVAL1	量产		评估板	N/A	价格录入中
ISL6244HRZ	量产	民用级	32 Ld QFN	2	2.84
ISL6244HRZ-T	量产	民用级	32 Ld QFN T+R	2	2.89
ISL6244CR	停产	民用级	32 Ld QFN	1	N/A
ISL6244CR-T	停产	民用级	32 Ld QFN T+R	1	N/A
ISL6244HR	停产	民用级	32 Ld QFN	1	N/A
ISL6244HR-T	停产	民用级	32 Ld QFN T+R	1	N/A