ISL6263ACRZ Intersil, ISL6263ACRZ Datasheet - Page 12

• Manufacturer Part Number: ISL6263ACRZ
• Description: IC VREG 5BIT 1PHASE 32-QFN
• Manufacturer: Intersil

Specifications of ISL6263ACRZ

• Applications: Converter, Intel IMVP-6
• Voltage - Input: 5 ~ 25 V
• Number Of Outputs: 1
• Voltage - Output: 5 ~ 25 V
• Operating Temperature: -10°C ~ 100°C
• Mounting Type: Surface Mount
• Package / Case: 32-VQFN Exposed Pad, 32-HVQFN, 32-SQFN, 32-DHVQFN
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Smooth mode transitions are facilitated by the R
which correctly maintains the internally synthesized ripple
current information throughout mode transitions.
Power Monitor
The ISL6263A features an IMVP-6+ compliant power
monitor output. The voltage between the PMON and VSS
pins is proportional to the product of the regulated output
voltage and the output inductor current. The output voltage is
measured between the VSEN and VSS pins. The output
inductor current is proportional to the voltage between the
DROOP and VO pins. The PMON pin has source and sink
capability for close tracking of transient power events. The
power monitor output is expressed as Equation 1:
Protection
The ISL6263A provides overcurrent protection (OCP),
overvoltage protection (OVP), and undervoltage protection
(UVP) as shown in Table 3.
Overcurrent protection is tied to the voltage droop, which is
determined by the resistors selected in “Static and Dynamic
Droop using Discrete Resistor Sensing” on page 17. After
the load line is set, the OCSET resistor can be selected. The
OCP threshold detector is checked every 15µs and will
increment a counter if the OCP threshold is exceeded,
conversely the counter will be decremented if the load
current is below the OCP threshold. The counter will latch an
OCP fault when the counter reaches eight. The fastest OCP
response for overcurrent levels that are no more than 2.5x
the OCP threshold is 120µs, which is eight counts at 15µs
V
FIGURE 5. SIMPLIFIED VOLTAGE DROOP CIRCUIT WITH GPU SOCKET KELVIN SENSING AND INDUCTOR DCR CURRENT SENSING
PMON
=
V
VDIFF
SEN
+
+
Σ
⋅
(
V
DROOP
OCP
−
−
−
+
+
+
–
V
12
10µA
O
)
⋅
(
DROOP
17.5
)
−
+
DROOP
OCSET
VSUM
VSEN
VDD
DFB
RTN
VO
3
modulator
R
(EQ. 1)
OCSET
C
ISL6263A
FILTER2
C
FILTER1
R
each. The ISL6263A protects against hard shorts by latching
an OCP fault within 2µs for overcurrent levels exceeding
2.5x the OCP
as Equation 2:
For example: The desired overcurrent trip level, I
R
Undervoltage protection is independent of the overcurrent
protection. If the output voltage measured on the VO pin is
less than +300mV below the voltage on the SOFT pin for
longer than 1ms, the controller will latch a UVP fault. If the
output voltage measured on the VO pin is greater than
195mV above the voltage on the SOFT pin for longer than
1ms, the controller will latch an OVP fault. Keep in mind that
V
states only after the soft-start capacitor C
the VID DAC output voltage. The UVP and OVP detection
circuits act on static and dynamic V
When an OCP, OVP, or UVP fault has been latched, PGOOD
becomes a low impedance and the gate driver outputs UGATE
and LGATE are pulled low. The energy stored in the inductor is
dissipated as current flows through the low-side MOSFET body
diode. The controller will remain latched in the fault state until
the VR_ON pin has been pulled below the falling VR_ON
threshold voltage V
falling POR threshold voltage
OCSET
SOFT
C
droop
FILTER3
load-line is 8mΩ, Equation 2 gives R
will equal the voltage level commanded by the VID
=
R
R
FILTER1
FILTER2
I
--------------------------------- -
OC
PHASE
10.1μA
⋅
threshold.
R
droop
VR_ONL
R
S
The value of R
or until VDD has gone below the
V
VDD_THF
L
OUT
V
V
CC_SNS
SS_SNS
SOFT
.
OCSET
CONNECTIONS
DCR
SOFT
PROCESSOR
voltage.
SOCKET
KELVIN
OCSET
TO
has slewed to
is calculated
OC
= 24kΩ.
, is 30A,
July 8, 2010
ESR
FN9284.3
C
(EQ. 2)
OUT