ISL6263CHRZ-T 查看數據表（PDF） - Renesas Electronics

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ISL6263CHRZ-T

5-Bit VID Single-Phase Voltage Regulator with Current Monitor for GPU Core Power

Renesas Electronics 

ISL6263C

VDD



OCP







10µA 

OCSET



Isense



ISP

ISN

ICOMP

VO

ROCSET

PHASE

RS

LOUT

DCR

COUT

ESR





VDIFF

VSEN

RTN

CFILTER1

RFILTER1

RFILTER2

CFILTER2

CFILTER3

VOUT

VGND

TO

PROCESSOR

KELVIN

CONNECTIONS

FIGURE 5. SIMPLIFIED GPU KELVIN SENSE AND INDUCTOR DCR CURRENT SENSE

VR_ON

~100µs

VSOFT/ VOUT

PGOOD

90%

minus the output voltage measured at the VO pin, is

proportional to the total inductor current. This information is

used for overcurrent protection and current monitoring. It is

important to note that this current measurement should not be

confused with the synthetic current ripple information created

within the R3 modulator.

When using inductor DCR current sense, an NTC

compensation network is optional to compensate the positive

temperature coefficient of the copper winding, thus maintaining

the current sense accuracy.

13 SWITCHING CYCLES

FIGURE 4. ISL6263C START-UP TIMING

Static Regulation

The output voltage VOUT will be regulated to the value set by

the VID inputs per Table 1. A true differential amplifier

connected to the VSEN and RTN pins implements processor

Kelvin sense for precise core voltage regulation at the GPU

voltage sense points.

The ISL6263C can accommodate DCR current sense or

discrete resistor current sense. The DCR current sense uses

the intrinsic series resistance of the output inductor, as shown

in the application circuit of Figure 2. The discrete resistor

current sense uses a shunt resistor in series with the output

inductor, as shown in the application circuit in Figure 3. In both

cases, the signal is fed to the non-inverting input of the current

sense amplifier at the ISP pin, where it is measured

differentially with respect to the output voltage of the converter

at the VO pin and amplified. The voltage at the ICOMP pin

Processor Kelvin Voltage Sense

The remote voltage sense input pins VSEN and RTN of the

ISL6263C are to be terminated at the die of the GPU. Kelvin

sense allows the voltage regulator to tightly control the

processor voltage at the die, compensating for various

resistive voltage drops in the power delivery path.

Since the voltage feedback is sensed at the processor die,

removing the GPU will open the voltage feedback path of the

regulator, causing the output voltage to rise towards VIN. The

ISL6263C will shut down when the voltage between the VO

and VSS pins exceeds the severe overvoltage protection

threshold VOVPS of 1.55V. To prevent this issue from

occurring, it is recommended to install resistors ROPN1 and

ROPN2, as shown in Figure 5. These resistors provide voltage

feedback from the regulator local output in the absence of the

GPU. These resistors should be in the range of 20Ω to 100Ω

High Efficiency Diode Emulation Mode

The ISL6263C operates in continuous-conduction-mode

(CCM) during heavy load for minimum conduction loss by

FN6745 Rev 1.00

July 8, 2010

Page 10 of 18

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