VRM Controller. LX1676 Datasheet

LX1676 Controller. Datasheet pdf. Equivalent

Part LX1676
Description Mobile AMD Athlon VRM Controller
Feature LX1676 TM ® Mobile AMD Athlon™ VRM Controller P RODUCTION D ATA S HEET DESCRIPTION KEY FEATURES ƒ.
Manufacture Microsemi Corporation
Datasheet
Download LX1676 Datasheet



LX1676
LX1676
TM ® Mobile AMD AthlonVRM Controller
PRODUCTION DATA SHEET
DESCRIPTION
The LX1676 is a highly integrated maximizing regulator response.
VRM power supply controller IC A true differential input amplifier is
featuring two PWM switching used for remote voltage sensing at the
www.rDeagtauSlhaeteot4rUs.tnaegt es.
processor core.
The two constant frequency A VID code generator provides an
voltage-mode PWM phases are internal reference that will set the
configured as a single biphase high output voltage. This VID code can be
current output core supply.
changed during operation and the
In biphase operation, the high reference will slew the output voltage to
current (>25A) output is generated by its new setting at a preset rate. During
a LoadSHARETM† technique that VID changes on the fly the Power Good
balances the currents in the two indication will stay valid.
phases. Power loss and noise, due to Current through the lower phase 1
the ESR of the input capacitors, are MOSFET will be sampled using its
minimized by operating the PWMs RDS(ON) for current limit and shut
180° out of phase.
down.
A synchronized Transient For further protection, an over
Correction Loop† provides except- voltage circuit will trip at a specified
ional control of the output droop and setting and clamp the output by turning
overshoot during very high di/dt load off the upper MOSFETs and turning on
changes, the circuit can be configured the lower MOSFETs.
for droop only, overshoot only or The upper MOSFET drivers will use
both.
a bootstrap capacitor to provide the
This architecture also minimizes upper drive voltage over the input
capacitor requirements while voltage range of 6 to 24 volts.
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
Patent numbers US6292378,US6285571,US6356063, US6605931
V in + 5 V
PRODUCT HIGHLIGHT
T ra n s ie n t C o rre c tio n L o o p
V in 6 to 2 4 V
70nH
5 B it V ID
LX1676
V in 6 to 2 4 V
KEY FEATURES
ƒ High Current Biphase
Operation
ƒ Outputs As Low As 0.925V
ƒ † Biphase LoadSHARETM
ƒ † Transient Correction Loop
Reduces Required
Capacitance
ƒ Differential Amplifier For
Remote Voltage Sensing
ƒ Integrated High Current
MOSFET Drivers
ƒ 200KHz to 1MHz Frequency
Operation
ƒ Programmable Slew Rate
Control For Start-Up Sequence
and VID change
ƒ VID Changes On The Fly
ƒ Power Good Indicator
ƒ Short Circuit Protection
ƒ Output Over Voltage and
Under Voltage Protection
ƒ No current-sense resistors
APPLICATIONS
ƒ AMD Mobile Athlonor
DuronProcessor Core
Voltage Supply
ƒ Voltage Regulator Modules
Vout
TJ (°C)
0 to 70
PACKAGE ORDER INFO
Plastic TSSOP
PW 38-Pin
Plastic MLPQ
LQ 38-Pin
RoHS Compliant / Pb-free Transition DC: 0518 RoHS Compliant / Pb-free Transition DC: 0512
LX1676CPW
LX1676CLQ
Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX1676CLQ-TR)
Copyright © 2000
Revision: 1.0, 4/12/2005
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1



LX1676
LX1676
TM ® Mobile AMD AthlonVRM Controller
PRODUCTION DATA SHEET
ABSOLUTE MAXIMUM RATINGS
Supply Input Voltage (VCCL, VCC)................................................-0.3V to 6.0V
Battery Input Voltage (VIN) ..............................................................-0.3V to 24V
Current Limit Sense (ILIM1, ILIM3) ................................................-0.3V to 30V
Topside Driver Supply Input Voltage (VC1, VC2, VC3)........ -0.3 toVSx + 6.0V
Topside Driver Return Input Voltage (VS1, VS2)................................-5V to 24V
Differential Sense Input Voltage (FB+, FB-)....................................-0.3V to 6.0V
VID0 – VID4, Input Voltage ...............................................................-0.3V to 6V
High Side Driver Peak (<500ns) Current (HO1/2, I-MAX) ............................+1A
Low Side Driver Peak (<500ns) Sink Current (LO1/2, I-MIN)....................+1.5A
Operating Junction Temperature.................................................................. 150°C
Storage Temperature Range...........................................................-65°C to 150°C
Lead Temperature (Soldering 10 seconds) .................................................. 300°C
RoHS Peak Package Solder Reflow Temperature
(40 second maximum exposure) ..................................................... 260°C (+0, -5)
Note: Exceeding these ratings could cause damage to the device. All voltages are with respect to
Ground. Currents are positive into, negative out of specified terminal.
PACKAGE PIN OUT
FB-
DFOUT
EO1
EA1-
DACOUT
PWGD
GND
VIN
ROSC
ENA
VID4
VID3
1 38 37 36 35 34 33 32 31
2 30
3 29
4 28
5 27
6 Connect Bottom to 26
Power GND
7 25
8 24
9 23
10 22
11 21
12 13 14 15 16 17 18 19 20
VS3
I-MAX
VC3
VC1
HO1
VS1
LO1
PGN
LO2
VCCL
I-MIN
PGN3
LQ PACKAGE
(Top View)
EA2-
EO2
FB+
FB-
DFOUT
EO1
EA1-
DACOUT
PWGD
GND
VIN
ROSC
ENA
VID4
VID3
VID2
VID1
VID0
VS2
1 38
19 20
PW PACKAGE
(Top View)
LP2
LP1
ILIM1
ILIM3
VS3
I-MAX
VC3
VC1
HO1
VS1
LO1
PGN
LO2
VCCL
I-MIN
PGN3
VCC
VC2
HO2
RoHS / Pb-free 100% Matte Tin Lead Finish
RECOMMENDED OPERATING CONDITIONS
Parameter
`
IC Input Supply Voltage
Battery Input Voltage
Biphase Topside Driver Return Voltage
Transient Correction Phase Driver Return Voltage
Symbol
VCC
VIN
VS1, VS2
VS3
LX1676
Units
Min Typ Max
4.5 5.5 V
5.7 24.0 V
0 24.0 V
0 5.5 V
Copyright © 2000
Revision: 1.0, 4/12/2005
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 2





@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site (Privacy Policy & Contact)