isl62881 Intersil Corporation, isl62881 Datasheet - Page 2

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

Pin Configurations
Pin Function Description
GND (Bottom Pad)
Signal common of the IC. Unless otherwise stated,
signals are referenced to the GND pin.
CLK_EN#
Open drain output to enable system PLL clock; goes
active 13 switching cycles after V
V
PGOOD
Power-Good open-drain output indicating when the
regulator is able to supply regulated voltage. Pull-up
externally with a 680Ω resistor to VCCP or 1.9kΩ to 3.3V.
RBIAS
A resistor to GND sets internal current reference. A
147kΩ resistor sets the controller for CPU core
application and a 47kΩ resistor sets the controller for
GPU core application.
VR_TT#
Thermal overload output indicator.
NTC
Thermistor input to VR_TT# circuit.
VW
A resistor from this pin to COMP programs the switching
frequency (8kΩ gives approximately 300kHz).
boot
CLK_EN#
PGOOD
.
RBIAS
COMP
VSEN
VW
FB
1
2
3
4
5
6
7
28
8
27 26 25 24 23 22
(28 LD TQFN)
9 10 11 12 13 14
TOP VIEW
ISL62881
(BOTTOM)
GND PAD
2
core
is within 10% of
21
20
19
18
17
16
15
ISL62881, ISL62881B
VID0
VCCP
LGATE
VSSP
PHASE
UGATE
VID1
COMP
This pin is the output of the error amplifier. Also, a
resistor across this pin and GND adjusts the overcurrent
threshold.
FB
This pin is the inverting input of the error amplifier.
VSEN
Remote core voltage sense input. Connect to
microprocessor die.
RTN
Remote voltage sensing return. Connect to ground at
microprocessor die.
ISUM- and ISUM+
Droop current sense input.
VDD
5V bias power.
VIN
Battery supply voltage, used for feed-forward.
IMON
An analog output. IMON outputs a current proportional to
the regulator output current.
BOOT
Connect an MLCC capacitor across the BOOT and the
PHASE pins. The boot capacitor is charged through an
internal boot diode connected from the VCCP pin to the
BOOT pin, each time the PHASE pin drops below VCCP
VR_TT#
PGOOD
RBIAS
COMP
GND
NTC
VW
FB
1
2
3
4
5
6
7
8
32
9 10 11 12 13 14 15
31 30 29 28 27 26
(32 LD TQFN)
ISL62881B
TOP VIEW
(BOTTOM)
GND PAD
25
16
October 26, 2009
24
23
22
21
20
19
18
17 UGATE
VID1
VID0
VCCP
LGATEb
LGATEa
VSSP
PHASE
FN6924.0