ISL62884CHRTZ Intersil, ISL62884CHRTZ Datasheet - Page 14

• Manufacturer Part Number: ISL62884CHRTZ
• Description: IC REG PWM SGL PHASE 28WQFN
• Manufacturer: Intersil

Specifications of ISL62884CHRTZ

• Applications: Controller, Intel IMVP-6
• Voltage - Input: 4.5 ~ 25 V
• Number Of Outputs: 1
• Voltage - Output: 0.0125 ~ 1.5 V
• Operating Temperature: -10°C ~ 100°C
• Mounting Type: Surface Mount
• Package / Case: 28-WQFN
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

VID6 VID5 VID4 VID3 VID2 VID1 VID0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
TABLE 1. VID TABLE (Continued)
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
14
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0.4500
0.4375
0.4250
0.4125
0.4000
0.3875
0.3750
0.3625
0.3500
0.3375
0.3250
0.3125
0.3000
0.2875
0.2750
0.2625
0.2500
0.2375
0.2250
0.2125
0.2000
0.1875
0.1750
0.1625
0.1500
0.1375
0.1250
0.1125
0.1000
0.0875
0.0750
0.0625
0.0500
0.0375
0.0250
0.0125
0.0000
0.0000
0.0000
0.0000
ISL62884C
(V)
V
O
As the load current increases from zero, the output
voltage will droop from the VID table value by an amount
proportional to the load current to achieve the load line.
The ISL62884C can sense the inductor current through
the intrinsic DC Resistance (DCR) of the inductors as
shown in Figure 1 or through a resistor in series with the
inductors as shown in Figure 2. In both methods,
capacitor C
currents. A droop amplifier converts C
internal current source with the gain set by resistor R
The current source is used for load line implementation,
current monitor and overcurrent protection.
Figure 9 shows the load line implementation. The
ISL62884C drives a current source I
pin, described by Equation 1.
When using inductor DCR current sensing, a single NTC
element is used to compensate the positive temperature
coefficient of the copper winding thus sustaining the load
line accuracy with reduced cost.
I
voltage drop as shown in Equation 2.
V
line. Changing R
the load line slope. Since I
protection level, it is recommended to first scale I
based on OCP requirement, then select an appropriate
R
I
V
VID6 VID5 VID4 VID3 VID2 VID1 VID0
COMP
DROOP
droop
FIGURE 9. DIFFERENTIAL SENSING AND LOAD LINE
DROOP
droop
DROOP
1
1
1
1
INTERNAL TO IC
flows through resistor R
value to obtain the desired load line slope.
=
is the droop voltage required to implement load
=
1
1
1
1
2xV
----------------- -
E/A
R
TABLE 1. VID TABLE (Continued)
n
R
IMPLEMENTATION
DROOP
voltage represents the inductor total
i
Cn
droop
1
1
1
1
FB
Σ
×
I
DROOP
I
or scaling I
VDAC
DROOP
1
1
1
1
R
V
droop
DROOP
DROOP
DAC
X 1
droop
1
1
1
1
also sets the overcurrent
DROOP
VIDS
RTN
VSS
droop
and creates a
0
0
1
1
n
RESISTOR
RESISTOR
“CATCH”
“CATCH”
voltage into an
can both change
out of the FB
VR LOCAL VO
0
1
0
1
VCC
VID<0:6>
VSS
March 16, 2010
SENSE
SENSE
0.0000
0.0000
0.0000
0.0000
droop
FN7591.0
(EQ. 1)
(EQ. 2)
(V)
V
O
i
.