lx1676 Microsemi Corporation, lx1676 Datasheet - Page 3

• Manufacturer Part Number: lx1676
• Description: Mobile Amd Athlontm Vrm Controller
• Manufacturer: Microsemi Corporation

Copyright © 2000
Revision: 1.0, 4/12/2005
DACOUT
DFOUT
PWGD
ROSC
I-MAX
PGN3
VCCL
Name
I-MIN
ILIM3
ILIM1
EA1-
GND
VID4
VID3
VID2
VID1
VID0
EA2-
PGN
ENA
VCC
HO2
HO1
FB+
EO1
VC3
VS3
EO2
LO2
VS2
VC2
LO1
VS1
VC1
LP1
LP2
FB-
VIN
TM
Differential Amplifier Positive Input – Feedback from output
Differential Amplifier Negative Input – Feedback from output
Differential Amplifier Output
Phase 1 Error Amplifier Negative Input
Phase 1 Error Amplifier Output
Analog Ground
A resister to ground sets PWM frequency
Enable Input – Logic Low disables all converter phases
DAC Output voltage – 50uA bi-directional current source
Digital Input for VID code – Has an internal pull-up resister
Digital Input for VID code – Has an internal pull-up resister
Digital Input for VID code – Has an internal pull-up resister
Digital Input for VID code – Has an internal pull-up resister
Digital Input for VID code – Has an internal pull-up resister
Power Good Output Pin – Open drain output pin for power good indication. High = Power Good
IC Supply Voltage. Nominal +5V
Supply for transient correction phase upper MOSFET driver, bootstrap voltage
Power ground pin for Transient Correction Loop driver
Output Driver for lower Transient Correction Loop MOSFET
Low side of upper driver for Transient Correction Loop – MOSFET Driver power return
Output Driver for upper Transient Correction Loop MOSFET
Transient Correction Loop current sense – A resister sets an upper limit for over current detection and shut down.
Phase 2 differential amplifier positive input, filtered feedback from phase 1 output
Negative Input of phase 2 integrating amplifier
Output of phase 2 integrating amplifier
Phase 2 differential amplifier negative input, filtered feedback from phase 2 output
Battery Voltage Input.
Driver Output for phase 2 lower MOSFET
Low side of upper gate driver for phase 2.
Driver Output for phase 2 upper MOSFET
Supply for phase 2 upper MOSFET driver, bootstrap voltage
Power ground pin for current sensing of lower MOSFET R
Driver Output for phase 1 lower MOSFET
Over-Current Limit Set – A resister sets an upper limit for over current detection and shut down.
Low side of upper gate driver for phase #1.
Driver Output for phase 1 upper MOSFET
Supply for phase 1 upper MOSFET driver, bootstrap voltage
Voltage bus for the lower MOSFET drivers. Nominal +5V
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]
F U N C T I O N A L P I N D E S C R I P T I O N
Integrated Products Division
®
Microsemi
Description
Mobile AMD Athlon™ VRM Controller
DS(ON)
P
for phase 1.
RODUCTION
D
ATA
S
HEET
LX1676
Page 3