13

FN9162.1

January 3, 2006

Simplified Application Circuit for Resistive Current Sensing

Figure 36 shows a simplified application circuit for the

ISL6260 or ISL6260B converter. Both the MOSFET drivers

and main control IC are shown. The driver has a force

continuous-conduction-mode (FCCM) input, that when

disabled, allows the regulator to operate in Diode Emulation

for improved light load efficiency.

R

i

R

1

R

3

V

O

V

+5

ISL6208

V

IN

V

+5

VCC

UGATE

LGATE

PHASE

BOOT

PWM

FCCM

GND

C

3

C

1

C

2

V

+5

7

VID<0:6>

DPRSLPVR

VR_ON

C

O

SOFT

VDIFF

OCSET

FB

PSI#

RBIAS

FCCM

PWM3

PWM2

VW

VO

COMP

VIDs

DPRSLPVR

PGD_IN

VIN

VR_ON

GND

PGOOD

PWM1

VDD

RTN

V

IN

VR_TT#

VSUM

R

FSET

PSI#

Remote

Sense at

CPU

CORE

ISEN1

ISEN2

ISEN3

VSEN

CLK_EN#

MCHOK

CLK_ENABLE#

ISL6208

VCC

UGATE

LGATE

PHASE

BOOT

PWM

FCCM

GND

VR_TT#

NTC

ISL6260

IMVP6_PWRGD

V

IN

V

+5

ISL6208

VCC

UGATE

LGATE

PHASE

BOOT

PWM

FCCM

GND

V

IN

DROOP

DFB

VO'

VSUM

L

O

R

L

C

L

VSUM

ISEN2

VO'

R

SEN

L

O

R

L

VSUM

ISEN1

VO'

R

SEN

L

O

R

L

C

L

VSUM

ISEN3

VO'

R

SEN

DPRSTP#

DPRSTP#

V

+3.3

3V3

C

L

FIGURE 36. TYPICAL APPLICATION CIRCUIT FOR DISCRETE RESISTOR CURRENT SENSING

ISL6260, ISL6260B