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Fairchild Semiconductor Electronic Components Datasheet



5018BMTCX

FAN5018BMTCX



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5018BMTCX pdf
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FAN5018B
6-Bit VID Controller 2-4 Phase VR10.X Controller
Features
• Improved Noise Immunity
• Improved Load Line Accuracy
• TTL Compatible VID Inputs
• Fully Pin and Function compatible with existing
FAN5018 and ADP3180 Controllers
• Precision Multi-Phase DC-DC Core Voltage Regulation
– ±14mV Output Voltage Accuracy Over Temperature
• Differential Remote Voltage Sensing
• Selectable 2-, 3-, or 4-Phase Operation
• Selectable VRM9 or VRM10 Operation
• Up to 1MHz per Phase Operation (4MHz ripple
Frequency)
• Lossless Inductor Current Sensing for Loadline
Compensation
– External Temperature Compensation
• Accurate Loadline Programming (Meets Intel®
VRM/VRD10.x CPU Specifications)
• Accurate Channel-Current Balancing for Thermal
Optimization and Layout Compensation
• Convenient 12V Supply Biasing
• 6-bit Voltage Identification (VID) Input
– .8375V to 1.600V in 12.5mV Steps
– Dynamic VID Capability with Fault-Blanking for
glitch-less Output voltage Changes
• Adjustable Over Current Protection with Programmable
Latch-Off Delay. Latch-Off Function may be Disabled
• Over-Voltage Protection – Internal OVP Crowbar
Protection
• Package: 28L-TSSOP
Applications
• VRM/VRD 9.x and 10.x Computer DC/DC Converter
• High-Current, Low-Voltage DC/DC Rail
General Description
The FAN5018B is a multi-phase DC-DC controller for
implementing high-current, low-voltage, CPU core power
regulation circuits. It is part of a chipset that includes exter-
nal MOSFET drivers and power MOSFETS. The
FAN5018B drives up to four synchronous-rectified buck
channels in parallel. The multi-phase buck converter archi-
tecture uses interleaved switching to multiply ripple fre-
quency by the number of phases and reduce input and output
ripple currents. Lower ripple results in fewer components,
lower component cost, reduced power dissipation, and
smaller board area.
The FAN5018B features a high-bandwidth control loop to
provide optimal response to load transients. The FAN5018B
senses current using lossless techniques: Phase current is
measured through each of the output inductors. This current
information is summed, averaged and used to set the loadline
of the output via programmable "droop." The droop is tem-
perature compensated to achieve precise loadline character-
istics over the entire operating range. Additionally,
individual phase current is measured using the RDS(ON) of
the low-side MOSFETs. This information is used to dynam-
ically balance/steer per-phase current. The phase currents
are also summed and averaged for over-current detection.
Dynamic-VID technology allows on-the-fly VID changes
with controlled, glitch-less output. Additionally, short-circuit
protection, adjustable current limiting, over-voltage protec-
tion and power-good circuitry combine to ensure reliable and
safe operation. FAN5018B is specified over the commercial
temperature range of 0°C to +85°C and operates from a sin-
gle +12V supply which simplifies design. FAN5018B is
available in a 28L-TSSOP package.
Block Diagram
VIN
Φ1 FAN5009
Φ2
FAN5018B
Φ3
Φ4 FAN5009
VIN
VOUT
REV. 1.0.0 Jul/15/05
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5018BMTCX pdf
FAN5018B
Pin Assignments
VID4 1
VID3 2
VID2 3
VID1 4
VID0 5
VID5/SEL 6
FBRTN 7
FB 8
COMP 9
PWRGD 10
EN 11
DELAY 12
RT 13
RAMPADJ 14
FAN5018B
TSSOP-28
28 VCC
27 PWM1
26 PWM2
25 PWM3
24 PWM4
23 SW1
22 SW2
21 SW3
20 SW4
19 GND
18 CSCOMP
17 CSSUM
16 CSREF
15 ILIMIT
PRODUCT SPECIFICATION
Pin Definitions
Pin Number
1–5
6
Pin Name
VID [4:0]
VID5/SEL
Pin Function Description
VID inputs. Determines the output voltage via the internal DAC. These inputs
comply to VRM10/VRD10 specifications for static and dynamic operation. All have
internal pull-ups (1.25V for VRM10 and 2.5V for VRM9) so leaving them open
results in logic high. Leaving VID[4:0] open results in a "No CPU" condition
disabling the PWM outputs.
VID5 Input/DAC Select. Dual function pin that is either the 12.5mV DAC LSB for
VRM10 or selects the VRM9 DAC codes when forced higher than Vtblsel(VRM9)
voltage. The truth table is as follows:
VVID5/SEL held > Vtblsel(VRM9); VRM9 DAC table is selected (See Table 3)
VViD5/SEL < Vtblsel(VRM10); VRM10 DAC table is selected (See Table 2) and
VViD5/SEL pin is used as VID5 input.
7 FBRTN Feedback Return. Error Amp and DAC reference point.
8 FB Feedback Input. Inverting input for Error Amp this pin is used for external
compensation. This pin can also be used to introduce DC offset voltage to the
output.
9 COMP Error Amp output. This pin is used for external compensation.
10 PWRGD Power Good output. This is an open-drain output that asserts when the output
voltage is within the specified tolerance. It is expected to be pulled up to an external
voltage rail.
11 EN Enable. Logic signal that enables the controller when logic high.
12 DELAY Soft-start and Current Limit Delay. An external resistor and capacitor sets the
softstart ramp rate and the over-current latch off delay.
13 RT Switching Frequency Adjust. This pin adjusts the output PWM switching
frequency via an external resistor.
14 RAMPADJ PWM Current Ramp Adjust. An external resistor to Vcc will adjust the amplitude of
the internal PWM ramp.
15 ILIMIT Current Limit Adjust. An external resistor sets the current limit threshold for the
regulator circuit. This pin is internally pulled low when EN is low or the UVLO circuit
is active. It is also used to enable the drivers.
2 REVFre.e1Da.0ta.s0heeJtuhtlt/p1:/5/w/w0w5.datasheet4u.com/



Part Number 5018BMTCX
Description FAN5018BMTCX
Maker Fairchild Semiconductor - Fairchild Semiconductor
Total Page 30 Pages
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