www.fairchildsemi.com
FAN5242
Voltage Regulator for IMVP-II Notebook Processors
Features
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Powers Intel IMVP-II CPU core
0.600V to 1.750V output voltage range
±1% reference precision over temperature
Dynamic VID code change supported
5V to 24V input voltage range
Special controls for Battery Mode and Deeper Sleep
Mode
Meets IMVP-II Load Lines
High efficiency at all load currents
Active Droop provides correct load lines
True differential remote voltage sense
Current sense uses MOSFETs
Power Good, Over-current, OV, UVLO
Space-saving QSOP24
Description
The FAN5242 provides the power, control and protection for
the CPU in Intel IMVP-II notebook PC applications. The IC
integrates a PWM controller as well as monitoring and
protection circuitry into a single 24 lead QSOP package.
It provides high efficiency PWM at maximum load and
hysteretic conversion at minimum load, and generates Intel
specified load lines in both Performance and Battery Mode.
The FAN5242 includes an Intel specified 5-input DAC that
adjusts the core PWM output voltage from 600mV to
1.750V in 25mV steps. The DAC setting may be changed
during operation, transition occurring in <100µsec. A
precision reference, true differential remote sense, and a
proprietary architecture with active droop provide excellent
static and dynamic core voltage regulation. The FAN5242
includes over-voltage, and over-current protection, and an
enable. It is available in a QSOP 24.
Applications
• Notebook CPUs
• Internet appliances
Typical Application
Vin = 5–24V
13
1
5
7
6
24
15
DPSLP
VID LINES
12
11
10
9
8
18
19
20
21
23
+
VCORE
FAN5242
22
16
17
3
4
14
2
PGOOD
EN
SS
+5Vin
GMUXSEL
DPRSLPVR
REV. 1.0.1 1/24/02
FAN5242
PRODUCT SPECIFICATIONS
Pin Assignments
AGND
VCC
PWRGD
ENBL
FPWM
SLP
FREQ
VID4
VID3
VID2
VID1
VID0
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
PVCC
LDRV
PGND
ISNS
SW
HDRV
BOOT
VCORE
VCORE
ILIM
SS
VBATT
Pin Description
Pin
Number
1
2
3
4
5
6
7
8-12
Pin Name
AGND
VCC
PWRGD
ENABLE
FPWM
SLP
FREQ
VID0-4
Pin Function Description
Analog Ground.
Return path for low power analog circuitry. This pin should be
connected to a low impedance system ground plane to minimize ground loops.
VCC.
Internal IC supply. Connect to system 5V supply, and decouple with a 0.1µF
ceramic capacitor.
Power Good Flag.
An open collector output that will be logic LOW if the output voltage
is not within ±10% of the nominal output voltage setpoint.
Output Enable.
A logic LOW on this pin will disable the output. An internal current source
allows for open collector control.
Forced PWM.
A logic HIGH on this pin forces the converter to remain in PWM mode.
Sleep Input.
A resistor to ground on this pin overrides the VID settings.
Frequency Set.
Grounding this pin sets the switching frequency to 300KHz. Attaching it
to VCC sets the frequency to 600KHz.
Voltage Identification Code Inputs.
These open collector/TTL compatible inputs will
program the output voltage over the range specified in Table 2. Pull-ups are internal to
the controller.
Battery Voltage Input.
Connect to the main power source.
Soft Start.
Current Limit.
A resistor from this pin to ground sets the over current trip level.
Voltage Feedback.
Connect these pins to the desired regulation point at the processor
for true differential feedback.
Bootstrap.
Input supply for high-side MOSFET.
High Side FET Driver.
Connect this pin to the gate of an N-channel MOSFET. The trace
from this pin to the MOSFET gate should be <0.5".
High side driver source and low side driver drain switching node.
Gate drive return
for high side MOSFET, and negative input for low-side MOSFET current sense.
Current Sense.
Connect this pin to the SW node through a resistor to sense output
current.
Power Ground.
Return pin for high currents flowing in low-side MOSFET. Connect
directly to low-side MOSFET source.
Low Side FET Driver.
Connect this pin to the gate of an N-channel MOSFET for
synchronous operation. The trace from this pin to the MOSFET gate should be <0.5".
Power VCC.
Provides power to drive low-side MOSFET.
13
14
15
16-17
18
19
20
21
22
23
24
VBATT
SS
ILIM
VCORE,
VCORE
BOOT
HDRV
SW
ISNS
PGND
LDRV
PVCC
2
REV. 1.0.1 1/24/02
PRODUCT SPECIFICATIONS
FAN5242
Absolute Maximum Ratings
Absolute maximum ratings are the values beyond which the device may be damaged or have its useful life
impaired. Functional operation under these conditions is not implied
.
Parameter
VCC Supply Voltage:
VBATT
BOOT, SW, HDRV Pins
BOOT to SW
All Other Pins
Junction Temperature (T
J
)
Storage Temperature
Lead Soldering Temperature, 10 seconds
–0.3
–10
–65
Min.
Typ.
Max.
6.5
27
33
6.5
VCC+0.3
150
150
300
Units
V
V
V
V
V
°C
°C
°C
Recommended Operating Conditions
Parameter
Supply Voltage VCC
Supply Voltage VBATT
Ambient Temperature (T
A
)
Conditions
Min.
4.75
5
–10
Typ.
5
Max.
5.25
24
85
Units
V
V
°C
Electrical Specifications
(VCC = 5V, VBATT = 5V–24V, and T
A
= recommended operating ambient temperature range using circuit of Figure
1 unless otherwise noted.)
Parameter
Power Supplies
VCC Current
VBATT Current
UVLO Threshold
Regulator / Control Functions
Output voltage
Initial Accuracy
Static Load Regulation
Error Amplifier Gain
Error Amplifier GBW
Error Amplifier Slew Rate
ILIM Voltage
Over-voltage Threshold
Over-voltage Protection delay
Under-voltage Shutdown
Under-voltage Delay
ENABLE, input threshold
Logic LOW
Logic HIGH
REV. 1.0.1 1/24/02
Conditions
Operating, C
L
= 10pF
Shut-down (ENABLE=0)
Operating
Shut-down (ENABLE=0)
Rising VCC
Falling
per Table 1. Output Voltage VID
Min.
Typ.
2.7
6
12
Max.
3.2
30
20
1
4.75
4.45
1.75
1
2
Units
mA
µ
A
µ
A
µ
A
V
V
V
% VID
% VID
dB
MHz
V/
µ
S
4.3
4.1
0.6
–1
–2
4.65
4.35
86
2.7
1
R
ILIM
= 30K
Ω
0.89
1.9
1.6
Disabled during VID code change
72
1.2
2
75
1.95
0.91
2.0
3.2
78
1.6
1.2
V
V
µ
S
% VID
µ
S
V
V
3
FAN5242
PRODUCT SPECIFICATIONS
Electrical Specifications(Continued)
(VCC = 5V, VBATT = 5V–24V, and T
A
= recommended operating ambient temperature range using circuit of Figure
1 unless otherwise noted.)
Parameter
Output Drivers
HDRV Output Resistance
LDRV Output Resistance
Oscillator
Frequency
Ramp Amplitude, pk–pk
Ramp Offset
Ramp Gain
Reference, DAC and Soft-Start
VID input threshold
VID pull-up current
DAC output accuracy
Soft Start current (I
SS
)
SLP Current Source
SLP to VID mode threshold
PWRGD
VCORE Upper Threshold
VCORE Lower Threshold
PWRGD Output Low
Leakage Current
Falling Edge
Rising Edge
I
PWRGD
= 4mA
V
PULLUP
= 5V
123
77
87
0.5
1
127
81
94
% VID
% VID
% VID
V
µ
A
at start-up, V
SS
.< 0.5
at start-up, 1.75 > V
SS
.> 0.5
Logic LOW
Logic HIGH
to internal 2.5V reference
–1
20
350
9.5
1.71
26
500
10
1.75
1.62
12
1
32
650
10.5
1.78
1.21
V
V
µ
A
%
µ
A
µ
A
µ
A
V
Ramp amplitude
------------------------------------------
-
VIN
FREQ = HIGH
FREQ = LOW
VBATT = 16V
255
510
300
600
2
0.5
125
345
690
KHz
KHz
V
V
mV/V
Sourcing
Sinking
Sourcing
Sinking
3.8
1.6
3.8
0.8
5
3
5
1.5
Ω
Ω
Ω
Ω
Conditions
Min.
Typ.
Max.
Units
4
REV. 1.0.1 1/24/02
PRODUCT SPECIFICATIONS
FAN5242
Table 1. Output Voltage Programming Codes
VID4
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
0
0
0
0
VID3
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
VID2
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
VID1
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
VID0
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
V
OUT
to CPU
0.600
0.625
0.650
0.675
0.700
0.725
0.750
0.775
0.800
0.825
0.850
0.875
0.900
0.925
0.950
0.975
1.000
1.050
1.100
1.150
1.200
1.250
1.300
1.350
1.400
1.450
1.500
1.550
1.600
1.650
1.700
1.750
1 - Logic High or open, 0 = Logic Low
REV. 1.0.1 1/24/02
5
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