isl62881 Intersil Corporation, isl62881 Datasheet - Page 3

• Manufacturer Part Number: isl62881
• Description: Single-phase Pwm Regulator For Imvp-6.5? Mobile Cpus And Gpus
• Manufacturer: Intersil Corporation

minus the voltage dropped across the internal boot
diode.
UGATE
Output of the high-side MOSFET gate driver. Connect the
UGATE pin to the gate of the high-side MOSFET.
PHASE
Current return path for the high-side MOSFET gate
driver. Connect the PHASE pin to the node consisting of
the high-side MOSFET source, the low-side MOSFET drain
and the output inductor.
VSSP
Current return path for the low-side MOSFET gate driver.
Connect the VSSP pin to the source of the low-side
MOSFET through a low impedance path, preferably in
parallel with the trace connecting the LGATE pin to the
gate of the low-side MOSFET.
LGATE (For ISL62881)
Output of the low-side MOSFET gate driver. Connect the
LGATE pin to the gate of the low-side MOSFET.
LGATEa (For ISL62881B)
Output of the low-side MOSFET gate driver that is always
active. Connect the LGATEa pin to the gate of the low-
side MOSFET that is active all the time.
3
ISL62881, ISL62881B
LGATEb (For ISL62881B)
Another output of the low-side MOSFET gate driver. This
gate driver will be pulled low when the DPRSLPVR pin
logic is high. Connect the LGATEb pin to the gate of the
low-side MOSFET that is idle in deeper sleep mode.
VCCP
Input voltage bias for the internal gate drivers. Connect
+5V to the VCCP pin. Decouple with at least 1µF of an
MLCC capacitor to VSSP1 and VSSP2 pins respectively.
VID0, VID1, VID2, VID3, VID4, VID5, VID6
VID input with VID0 = LSB and VID6 = MSB.
VR_ON
Voltage regulator enable input. A high level logic signal
on this pin enables the regulator.
DPRSLPVR
A high level logic signal on this pin puts the ISL62881 in
1-phase diode emulation mode. If R
VR application), this pin also controls V
V
for DPRSLPVR = 1. If R
application), this pin doesn’t control V
core
slews at 5mV/µs for DPRSLPVR = 0 and 10mV/µs
BIAS
= 147kΩ (CPU VR
BIAS
core
core
= 47kΩ (GPU
slew rate.
slew rate.
October 26, 2009
FN6924.0