ISL6561 Multiphase PWM Controller with Precision Rds, On or DCR Current Sensing

VIN (min) (V)	3
VIN (max) (V)	12
VOUT (min) (V)	0.8375
VOUT (max) (V)	1.65
IOUT (max) (A)	>120

The ISL6561 controls microprocessor core voltage regulation by driving up to 4 synchronous-rectified buck channels in parallel. Multiphase buck converter architecture uses interleaved timing to multiply channel ripple frequency and reduce input and output ripple currents. Lower ripple results in fewer components, lower component cost, reduced power dissipation, and smaller implementation area.

Microprocessor loads can generate load transients with extremely fast edge rates. The ISL6561 features a high bandwidth control loop and ripple frequencies of >4MHz to provide optimal response to the transients.

Today's microprocessors require a tightly regulated output voltage position versus load current (droop). The ISL6561 senses current by utilizing patented techniques to measure the voltage across the on resistance, rDS(ON), of the lower MOSFETs or DCR of the output inductor during the lower MOSFET conduction intervals. Current sensing provides the needed signals for precision droop, channel-current balancing, and over-current protection.

The accuracy of the current-sensing metho

d is enhanced by the ISL6561's temperature compensation function. Droop accuracy can be affected by increasing rDS(ON) or DCR with elevated temperature. The ISL6561 uses an internal temperature-sensing element to provide programmable temperature compensation. Correctly applied, temperature compensation can completely nullify the effect of rDS(ON) or DCR temperature sensitivity.

A unity gain, differential amplifier is provided for remote voltage sensing. Any potential difference between remote and local grounds can be completely eliminated using the remote-sense amplifier. Eliminating ground differences improves regulation and protection accuracy. The thresholdsensitive enable input is available to accurately coordinate the start up of the ISL6561 with any other voltage rail. Dynamic-VIDTM technology allows seamless on-the-fly VID changes. The offset pin allows accurate voltage offset settings that are independent of VID setting. The ISL6561 uses 5V bias and has a built-in shunt regulator to allow 12V bias using only a small external limiting resistor.

ISL6561 特点

Precision Multiphase Core Voltage Regulation
- Differential Remote Voltage Sensing
- ±0.5% System Accuracy Over Life, Load, Line and Temperature
- Adjustable Reference-Voltage Offset
Precision rDS(ON) or DCR Current Sensing
- Integrated Programmable Temperature Compensation
- Accurate Load-Line Programming
- Accurate Channel-Current Balancing
- Differential Current Sense
- Low-Cost, Lossless Current Sensing
Internal Shunt Regulator for 5V or 12V Biasing
Microprocessor Voltage Identification Input
- Dynamic VIDTM technology
- 6-Bit VID Input
- 0.8375V to 1.600V in 12.5mV Steps
Threshold-Sensitive Enable Function for synchronizing with driver POR
Over Current Protection
Over-Voltage Protection
- No Additional External Components Needed
- OVP Pin to drive opitional Crowbar Device
2, 3, or 4 Phase Operation
Greater Than 1MHz Operation (> 4MHz Ripple)
Pb-free Available
QFN Package Option
- QFN Compliant to JEDEC PUB95 MO-220 QFN - Quad Flat No Leads - Product Outline
- QFN Near Chip Scale Package Footprint; Improves PCB Efficiency, Thinner in Profile

ISL6561 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 $
ISL6561CRZ	量产	民用级	40 Ld QFN	3	2.39
ISL6561CRZ-T	量产	民用级	40 Ld QFN T +R	3	2.39
ISL6561CRZ-TK	量产	民用级	40 Ld QFN T +R	3	2.39
ISL6561CRZA	量产	民用级	40 Ld QFN	3	2.39
ISL6561CRZA-T	量产	民用级	40 Ld QFN T +R	3	2.39
ISL6561IRZ	量产	工业级	40 Ld QFN T +R	3	2.49
ISL6561IRZ-T	量产	工业级	40 Ld QFN T +R	3	2.49
ISL6561CR	停产	民用级	40 Ld QFN	2	N/A
ISL6561IR	停产	工业级	40 Ld QFN	2	N/A
ISL6561IR-T	停产	工业级	40 Ld QFN T +R	2	N/A
ISL6561CR-T	To Be Discontinued	民用级	40 Ld QFN T +R	2	2.39