LX1676 Datasheet PDF - Microsemi Corporation
| Part Number | LX1676 | |
| Description | Mobile AMD Athlon VRM Controller | |
| Manufacturers | Microsemi Corporation | |
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LX1676
TM ® Mobile AMD Athlon™ VRM 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
High Current Biphase
Operation
Outputs As Low As 0.925V
† Biphase LoadSHARETM
† Transient Correction Loop
Reduces Required
Capacitance
Differential Amplifier For
Remote Voltage Sensing
Integrated High Current
MOSFET Drivers
200KHz to 1MHz Frequency
Operation
Programmable Slew Rate
Control For Start-Up Sequence
and VID change
VID Changes On The Fly
Power Good Indicator
Short Circuit Protection
Output Over Voltage and
Under Voltage Protection
No current-sense resistors
APPLICATIONS
AMD Mobile Athlon™ or
Duron™ Processor Core
Voltage Supply
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
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LX1676
TM ® Mobile AMD Athlon™ VRM Controller
PRODUCTION DATA SHEET
ELECTRICAL CHARACTERISTICS (CONTINUED)
Unless otherwise specified, the following specifications apply over the operating ambient temperature 0°C ≤ TA ≤ 70°C except where
otherwise noted and the following test conditions: VCC = 5V, VCCL = 5V, VIN = 12V, Switching Frequency = 500KHz.
Parameter
Symbol
Test Conditions
` PHASE 2 DIFFERENTIAL AMPLIFIER
Input Offset Voltage
Gain
Common Mode Rejection Ratio
VOS LP1=LP2
ADA
CMRRDA Common Mode Voltage = 0 to 2 V
Input Resistance
Unity Gain Bandwidth
` TRANSIENT CONTROL LOOP
RB
UGBW
Voltage Droop Sense
Propagation Delay : FB+ and
FB- to I-MAX
Voltage Overshoot Sense
Propagation Delay : FB+ and
FB- to I-MIN
Voltage Droop Sense Threshold
Voltage Overshoot Sense
Threshold
` OUTPUT DRIVERS
VDFOUT Rising 3000pF Load
VDFOUT Falling 3000pF Load
Driver
Rise Time
Fall Time
High Side Driver Voltage:
tRISE
tFALL
CL = 3000pF, VCx - VSx = 5V
[VHOx - VVSx]
Drive High
Drive Low
Low Side Driver Voltage:
VHOx = 20mA, VCx - VSx = 5.0 V
VHOx = -20mA, VCx - VSx = 5.0 V
[VLOx – VPGN]
Drive High
Drive Low
High Side Driver Current
VLOx = 20mA, VCCL - VPGN = 5.0 V
VLOx = -20mA, VCCL - VPGN = 5.0 V
IHOx
VCx - VSx = 5.0 V, Load = 3300pf at
<500nSec
Lower MOSFET Driver Current
ILOx
` PHASE 1 OVER CURRENT PROTECTION
VCCL - PGN = 5.0 V, Load = 3300pf at
<500nSec
Current Sense Bias Current
IILIM1
Current Sense Delay
tCSD(ILIM1)
` TRANSIENT CORRECTION LOOP OVER CURRENT PROTECTION
Current Sense Bias Current
IILIM3
Current Sense Delay
tCSD(ILIM3)
` ENABLE INPUT / VOLTAGE IDENTIFICATION (VID)
Logic Low Threshold
Hysteresis
Pullup Resistance
` POWER GOOD
Low Output Voltage
VPWGD IPWGD = -3mA
LX1676
Units
Min Typ Max
-6 6 mV
0.98 1 1.02 V/V
60 dB
180 KΩ
4 MHz
50 nS
50 nS
40 mV
40 mV
50 nS
50
4.8 4.9
0.1 0.2
V
4.8 4.9
0.1 0.2
1
1.5
V
A
A
44 50 60 µA
200 400 500 nS
40 50 60 µA
200 400 500 nS
1.5 V
0.3 V
100 KΩ
0.5 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 5
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Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for LX1676 electronic component. |
| Information | Total 16 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ LX1676.PDF Datasheet ] | |
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