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LX1672 데이터시트 PDF




Microsemi Corporation에서 제조한 전자 부품 LX1672은 전자 산업 및 응용 분야에서
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부품번호 LX1672 기능
기능 Multiple Output LoadSHARE PWM
제조업체 Microsemi Corporation
로고 Microsemi Corporation 로고


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LX1672 데이터시트, 핀배열, 회로
LX1672
TM ® Multiple Output LoadSHARE™ PWM
PRELIMINARY DATA SHEET
DESCRIPTION
The LX1672 is a highly integrated This patented approach also gives
power supply controller IC featuring system designers maximum flexibility with
www.tDwaotaShPeWet4MU.nestwitching regulator stages respect to MOSFET supply. Each phase
with an additional onboard linear can utilize different supply voltages, for
regulator driver.
efficient use of available supplies, while
The two constant frequency voltage- programming the ratio of current pulled
mode PWM phases can be easily from each using one of three methods (see
configured as a single Bi-Phase high application section).
current output, two independently The LX1672 incorporates fully
regulated outputs, or as a DDR memory programmable soft-start sequencing
I/O supply with a tracking DDR capabilities. Each output can be
termination voltage supply. Power loss configured to come up in any order
and noise, due to the ESR of the input necessary as required by the application.
capacitors, are minimized by operating The LX1672 features an additional
each PWM output 180° out of phase. Linear Regulator Driver output, which
This architecture also minimizes when coupled with an inexpensive
capacitor
requirements
while MOSFET is capable of supplying up to 5A
maximizing regulator response.
for I/O, memory, and other supplies
In bi-phase operation, the high surrounding today’s micro-processor
current output utilizes a patented current designs.
sharing architecture, called Forced Each regulator voltage output is
Current Sharing, to allow accurate programmed via a simple voltage-divider
current sharing without the use of network. The LX1672, utilizing MOSFET
expensive current sense resistors.
RDS(ON) impedance, monitors maximum
current limit conditions, in each PWM
phase without the use of expensive current
sense resistors.
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
LoadSHARE is a Trademark of Microsemi Corporation
PRODUCT HIGHLIGHT
KEY FEATURES
ƒ Up to Three Independently
Regulated Outputs
ƒ DDR Termination Compliant
ƒ Bi-phase Current Sharing
ƒ Outputs As Low As 0.8V
Generated From An Internal 1%
Reference
ƒ Multiphase High Current Output
Reduces Required Capacitance
ƒ Integrated High Current MOSFET
Drivers
ƒ 300KHz, 500KHz and 600KHz
High Frequency Operation
Minimizes External Component
Requirements
ƒ Independent Phase Programmable
Soft-Start and Power Sequencing
ƒ Adjustable Linear Regulator Driver
Output
ƒ No current-sense resistors
APPLICATIONS/BENEFITS
ƒ Multi-Output Power Supplies
ƒ Video Card Power Supplies
ƒ DDR, VDDQ and Termination
Supply
ƒ PC Peripherals
ƒ Portable PC Processor and I/O
Supply
Refer to Typical
Application for
com plete circuit.
DDR Term ination
....
Mem ory Core
12V
5V
3.3V
LX1672
Graphics
Controller
Memory Bus
I/O
DDR Mem ory
TA (°C)
0 to 70
0 to 70
0 to 70
Switching
Frequency (kHz)
300
500
600
PACKAGE ORDER INFO
Plastic TSSOP
PW 28-Pin
RoHS Compliant / Pb-free Transition DC: 0518
LX1672-03CPW
LX1672-05CPW
Plastic MLPQ
LQ 38-Pin
RoHS Compliant / Pb-free Transition DC: 0512
LX1672-03CLQ
LX1672-06CLQ
NOTE: Available in Tape & Reel. Append the letters “TR” to the part number (i.e. LX1672-06CLQ-TR)
Copyright © 2000
Rev. 0.3m, 2005-04-12
Microsemi
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1




LX1672 pdf, 반도체, 판매, 대치품
LX1672
TM ® Multiple Output LoadSHARE™ PWM
PRELIMINARY DATA SHEET
ELECTRICAL CHARACTERISTICS
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, VCX = 12V, HOX = LOX = 3000pF Load.
Parameter
Symbol
Test Conditions
` SWITCHING REGULATORS
Input Voltage
Input Voltage
Operation Current
Reference Voltage
Line Regulation (Note 2)
VCC
VCCL, VCX
ICC
VSS
Static and Dynamic
TA = 25°C
0°C < TA < 70°C
Load Regulation (Note 2)
Minimum Pulse Width
TSSOP Package
Minimum Pulse Width
MLPQ PAckage
Maximum Duty Cycle
LX1672-03 Load = 3000pF
Maximum Duty Cycle
LX1672-05 Load = 3000pF
Maximum Duty Cycle
LX1672-06 Load = 3000pF
` ERROR AMPLIFIERS
Input Offset Voltage
Vos Common Mode Input Voltage = 1V
DC Open Loop Gain
Unity Gain Bandwidth
UGBW
High Output Voltage
Low Output Voltage
Input Common Mode Range
VOH I Source = 2mA
VOL I Sink = 10uA
Input Offset Voltage < 20mV
Input Bias Current
` CURRENT SENSE
IIN 0 and 3.5 V Common Mode Input Voltage
Current Sense Bias Current
Trip Threshold
Current Sense Delay
Current Sense Comparator
Operating Current
ISET
VTRIP
TCSD
ICSX
VCSX = VVSX – 0.3V , VVSX = 5V
Referenced to VSX , VVSX = 5V
Current into VSX pins
` OUTPUT DRIVERS – N-CHANNEL MOSFETS
Low Side Driver Operating Current
High Side Driver Operating Current
Drive Rise Time, Fall Time
High Level Output Voltage
Low Level Output Voltage
` OSCILLATOR
IVCCL
IVCX
TRF
VDH
VDL
Static
Static
CL = 3000pF
ISOURCE = 20mA, VCCL = 12V
ISINK = 20mA, VCCL = 12V
PWM Switching Frequency
LX1672-03
PWM Switching Frequency
FSW LX1672-05
PWM Switching Frequency
LX1672-06
Ramp Amplitude
VRAMP
LX1672
Units
Min Typ Max
4.5 5.5 V
16 V
10 mA
0.792
0.784
0.8
0.808
0.816
V
-1 1 %
-1 1 %
250 nS
150 nS
85 %
75 %
70 %
-6.0 6.0 mV
70 dB
16 MHz
3.8 5
V
100 mV
.1 3.5 V
100 nA
45 50 55 µA
260 300 340 mV
350 nS
2 5 mA
2.5 mA
3 mA
50 nS
10 11
V
0.15 0.25
V
255 300 345 KHz
425 500 575 KHz
510 600 690 KHz
1.25
VPP
Copyright © 2000
Rev. 0.3m, 2005-04-12
Microsemi
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 4

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LX1672 전자부품, 판매, 대치품
LX1672
TM ® Multiple Output LoadSHARE™ PWM
PRELIMINARY DATA SHEET
BLOCK DIAGRAM
VS2
LPF2
EO2
FB2
RF2
LPF1
PHASE1
CS2
VTRIP
CS Comp
- IRESET
+
ISET
RSET
PWM
RQ
SQ
Error Comp
+
--
+ Amplifier/
Compensation
VREF
20k
Ramp
Oscillator
UVLO
S
F FAULT S
RS
SS1
SS2
Hiccup
ISET
+5V
VC2
HO2
LO2
PG2
+5V
VCCL
UVLO
TEMP
16V 16V
+5V
VCC
5.5V
Vin
CIN
V out 2
L2
ESR
COUT
CSS
SS
DIS 2
Figure 3– Block Diagram of Phase 2 Connected in LoadSHARE Mode
Note: With the MLPQ package there is only one PGX output (PG1 and PG2 are common)
Copyright © 2000
Rev. 0.3m, 2005-04-12
Microsemi
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
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