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FAN5032 데이터시트 PDF




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부품번호 FAN5032 기능
기능 8-Bit Programmable 2 to 4 Phase Synchronous Buck Controller
제조업체 Fairchild Semiconductor
로고 Fairchild Semiconductor 로고


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FAN5032 데이터시트, 핀배열, 회로
April 2006
FAN5032
8-Bit Programmable 2 to 4 Phase Synchronous Buck
Controller
Features
Description
Selectable 2, 3, or 4 phase operation at up to 1MHz
The FAN5032 is a controller for a multi-phase buck
per phase
switching regulator optimized to convert a 12V input
±7.7mV worst-case differential sensing error over
temperature
Active current balancing between the output phases
Power good and crowbar blanking supports on-the-fly
VID code changes
0.5V to 1.6V output
Fully compliant to Intel® VR10 and VR11
specifications
supply to the processor core voltage required by high-
performance Intel processors. It has an internal 8-bit
digital to analog converter (DAC) that converts a digital
voltage identification (VID) code, sent from the processor
to set the output voltage between 0.5V and 1.6V in
6.25mV steps. It outputs a pulse-width modulated (PWM)
signal to external MOSFET drivers that, in turn, drive the
switching power MOSFETs. The switching frequency of
the design is programmable by a single resistor value
Selectable VR10 extended (7 bit) and VR11 (8 bit)
VID tables
and the number of phases can be programmed to sup-
port 2, 3, or 4 phase applications.
Programmable soft-start ramp
Programmable short-circuit protection and latch-off
The FAN5032 also includes programmable no-load off-
set and droop functions to adjust the output voltage as a
delay
function of the load current, as required by the Intel spec-
Special Features
ifications. The FAN5032 also provides an accurate and
www.DataSheetr4eU.lcioamble short-circuit protection function with an adjust-
300mV OVP and crowbar threshold
able over-current set point.
Applications
The FAN5032 is specified over the commercial tempera-
ture range of 0°C to 85°C and is available in a 40-lead
Desktop PC/server processor power supplies for
MLP package.
existing and next-generation Intel processors
VRM modules
Ordering Information
Product
Number
FAN5032MPX
Package Type
MLP-40
Pb-Free
Yes
Operating
Temperature Range
0°C to 85°C
Packing Meathod
Tape and Reel
Quantity
per Reel
3,000
©2006 Fairchild Semiconductor Corporation
FAN5032 Rev. 1.0.0
1
www.fairchildsemi.com




FAN5032 pdf, 반도체, 판매, 대치품
Pin Assignments (Continued)
Pin # Pin Name
Pin Description
9 VRHOT
VR Hot Output. Open drain output that goes high when the TTSENSE voltage goes
below the internal VRHOT threshold.
10 TTSENSE
Thermal Sense Input. A positive internal current source is connected to this pin.
Connecting an external NTC thermistor between this pin and GND produces a positive
input voltage that is proportional to temperature.
11 ILIMIT
Current Limit Set. An external resistor from this pin to GND sets the current limit
threshold of the converter.
12 RT
Frequency Set Input. An external resistor connected between this pin and GND sets
the oscillator frequency of the device.
13 RAMPADJ
PWM Ramp Set Input. An external resistor connected between this pin and the
converter input voltage sets the internal PWM ramp.
14 LLSET
Load Line Set Input. This pin can be directly connected to CSCOMP or connected to
the center point of a resistor divider between CSCOMP and CSREF. Connecting LLSET
to CSREF disables positioning.
15 CSREF
Current Sense Amplifier Positive Input. The voltage on this pin is used as the
reference for the current sense amplifier. The power good and crowbar functions are
also internally connected to this pin.
16 CSSUM
Current Sense Amplifier Negative Input
17 CSCOMP
Current Sense Amplifier Compensation Output
18 GND
Ground. All internal biasing and logic output signals of the device are referenced to this
ground.
19 OD
Output Disable. This pin is actively pulled low when the EN input is low or when VCC is
below its UVLO threshold, to disable the external MOSFET drivers.
20 to 21 NC
No Connection
22 to 25 SW4 to SW1
Switching Node Current Balance Inputs. Sense the switching side of the inductor and
are used to measure the current level in each phase. The SW pins of unused phases
should be left open.
26 NC
No Connection
27 to 30 PWM4 to PWM1 PWM Outputs. Each output is connected to the input of an external MOSFET driver,
such as the FAN5109. Connecting the PWM3 and/or PWM4 outputs to VCC disables
that phase, allowing the FAN5032 to operate as a 2, 3, or 4 phase controller.
31 VCC
Supply Voltage for the Device
32 to 39 VID7 to VID0
Voltage Identification Code Inputs. These digital inputs are connected to the internal
DAC and are used to program the output voltage. These pins have 1µA internal pull-
down; left open, the input state is decoded as logic low.
40 VIDSEL
VID Table Select Input. A logic low selects the extended VR10 DAC table and a logic
high selects the VR11 DAC table. This pin has a 1µA internal pull-down; left open, the
input state is decoded as logic low.
– Exposed Paddle Internally connected to die ground. May be connected to ground or left floating.
Connect to ground for lowest package thermal resistance.
4 www.fairchildsemi.com
FAN5032 Rev. 1.0.0

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