UCC2880-6 Unitrode Semiconductor, UCC2880-6 Datasheet

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UCC2880-6

Manufacturer Part Number
UCC2880-6
Description
PentiumR Pro Controller
Manufacturer
Unitrode Semiconductor
Datasheet
10/96
Pentium® Pro Controller
FEATURES
BLOCK DIAGRAM
Combined DAC/Voltage
Monitor and PWM Functions
4-Bit Digital-to-Analog
Converter (DAC)
1.0% DAC/Reference
Low Offset X20 Current Sense
Amplifier
100kHz, 200kHz, 400kHz
Oscillator Frequency Options
Foldback Current Limiting
Overvoltage and Undervoltage
Fault Windows
Undervoltage Lockout
2 Totem Pole Output
Chip Disable Function
DESCRIPTION
The UCC3880-4/-5/-6 combines high precision reference and voltage monitor-
ing circuitry with average current mode PWM controller circuitry to power Intel
Pentium Pro and other high-end microprocessors with a minimum of external
components. The UCC3880-x converts 5VDC to an adjustable output, ranging
from 2.0VDC to 3.5VDC in 100mV steps with 1% DC system accuracy.
The chip includes a precision 5V reference which is capable of sourcing cur-
rent to an external load. The output voltage of the DAC is derived from this
reference, and is programmed directly by Intel’s VID pins (Table 1).
The accuracy of the DAC/reference combination is 1.0%. The overvoltage and
undervoltage comparators monitor the system output voltage and indicate
when it rises above or falls below its programmed value by more than 7.5%. A
second overvoltage protection comparator pulls the current amplifier output
voltage low to force zero duty cycle when the system output voltage exceeds
its designed value by more than 15%. This comparator also terminates the cy-
cle. Undervoltage lockout circuitry assures the correct logic states at the out-
puts during powerup and powerdown. Grounding the ENABLE pin forces the
GATE output low.
UCC2880-4/-5/-6
UCC3880-4/-5/-6
PRELIMINARY
(continued)
UDG-96106-1

Related parts for UCC2880-6

UCC2880-6 Summary of contents

Page 1

... This comparator also terminates the cy- cle. Undervoltage lockout circuitry assures the correct logic states at the out- puts during powerup and powerdown. Grounding the ENABLE pin forces the GATE output low. UCC2880-4/-5/-6 UCC3880-4/-5/-6 PRELIMINARY (continued) UDG-96106-1 ...

Page 2

... The gate driver pole output stage capable of driving an external MOSFET. This device is available in 20-pin dual in-line and surface mount packages. The UCC2880-x is specified for opera- tion from –25°C to 85°C, and the UCC3880-x is specified for operation from 0°C to 70°C. ...

Page 3

... CM 1V < V < 3V CAO 2.5V COMP CAM 1.5V < V < 4.9V CM 10.8V < VIN < 15V 2.5V CAM CAO COMP 2.5V CAM CAO COMP F = 100kHz 3 UCC2880-4/-5/-6 UCC3880-4/-5/-6 = 5V, VD0 = ENBL MIN TYP MAX UNITS 7 7 470 1 s –10 –7.6 % –7.4 – –50 – ...

Page 4

... (DAC Digital Input Control Codes): These are and must therefore the DAC digital input control codes, with D0 representing the least significant bit (LSB) and D3, the most significant bit (MSB). A bit is set low by being connected to GND UCC2880-4/-5/-6 UCC3880-4/-5/-6 = 5V, VD0 = ENBL MIN TYP ...

Page 5

... Related Publications CSA to set the short cir- U-156 and U-157 are Unitrode Application Notes describ- ing the operation of the UC3886 and the UC3886/ UC3910 together in a Pentium® Pro application. 5 UCC2880-4/-5/-6 UCC3880-4/-5/-6 0.10 F. 1.4V 4.4m 16A 20 ...

Page 6

... TYPICAL APPLICATION The UCC3880-x is ideal for converting the 5.0V system UCC3880 Configured for Powering the Pentium® Pro bus into the required Pentium® Pro bus voltage. 6 UCC2880-4/-5/-6 UCC3880-4/-5/-6 UDG-96224 ...

Page 7

... Radial Can 10x20mm Radial Can 10x20mm Radial Can 10x20mm Radial Can 10x20mm Radial Can 10x20mm Radial Can 10x20mm Radial Can SMD Power Package 7 UCC2880-4/-5/-6 UCC3880-4/-5/-6 PACKAGE SOIC-20 Wide SPRAGUE Size A EIA Size D SMD 1206 SMD 0603 SMD 0603 SMD 0603 SMD ...

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