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Número de pieza | LX1675 | |
Descripción | Multiple Output LoadSHARE PWM | |
Fabricantes | Microsemi Corporation | |
Logotipo | ||
Hay una vista previa y un enlace de descarga de LX1675 (archivo pdf) en la parte inferior de esta página. Total 19 Páginas | ||
No Preview Available ! LX1675
TM ® Multiple Output LoadSHARE™ PWM
PRODUCTION DATA SHEET
DESCRIPTION
The LX1675 is a highly integrated High current MOSFETs can be directly
power supply controller IC featuring driven to provide an LDO output of 5A
three voltage mode PWM switching and 15A for each PWM controller. This
www.rDeagtuaSlahteoetr4U.snteatges with an additional is useful for I/O, memory, termination,
onboard linear regulator driver.
and other supplies surrounding today’s
Two of the constant frequency PWM micro-processor based designs.
phases can be easily configured for a The LX1675 accepts a wide range of
single Bi-Phase high current output or supply voltage ranging from 4.5V to 24V.
operated as two independently regulated Each PWM regulator output voltage is
outputs. All outputs (PWM phases and programmed via a simple voltage-divider
LDO) have separate, programmable soft- network. The LX1675 design gives
start sequencing. This versatility yields engineers maximum flexibility with
either three or four independently respect to the MOSFET supply. Each
regulated outputs with full power phase can utilize different supply voltages
sequencing capability giving system for efficient use of available supply rails.
designers the ultimate flexibility in power Additionally, when two phases are
supply design.
configured in Bi-Phase output, the
Current limit for each PWM regulator LoadSHARE™ topology can be
is provided by monitoring the voltage programmed via inductor ESR selection.
drop across the lower MOSFET power The split phase operation reduces power
stage during conduction, utilizing the loss, noise due to the ESR of the input
Rds(on) impedance. This eliminates the capacitors and allows for reduction in
need for expensive current sense capacitance values while maximizing
resistors. Once current limit has been regulator response time. The internal
reached and persist for 4 clock cycles, the reference voltage is buffered and brought
output is shut off and Soft Start is out on a separate pin to be used as an
initialized to force a hiccup mode for external reference voltage.
protection.
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
LoadSHARE is a Trademark of Microsemi Corporation
Protected by U.S. Patents 6,285,571 and 6,292,378
VIN 4.5V to 24V
PRODUCT HIGHLIGHT
VOUT4
VCCL
VIN
VSLR
LDGD
LDFB
SSX
LX1675
AGND
EOX
HOX
VCX
HRX
CSX
LOX
PGX
FBX
5µh
VOUT1, 2, 3
KEY FEATURES
Four Independently Regulated
Outputs
Single Input Supply with Wide
Voltage Range: 4.5-24V
Outputs As Low As 0.8V
Generated From a Precision
Internal Reference
Selectable PWM Frequency of
300KHz or 600KHz
Buffered Reference Voltage
Output
Multiphase Output Reduces
Need for Large Input
Capacitance at High Currents
Integrated High Current
MOSFET Drivers
Independent Soft-Start and
Power Sequencing
Adjustable Linear Regulator
Driver Output
No Current-Sense Resistors
DDR Termination Compliant
RoHS Compliant for Pb Free
APPLICATIONS
Multi-Output Power Supplies
Video Card Power Supplies
PC Peripherals
Portable PC Processor and I/O
Supply
PACKAGE ORDER INFO
TA (°C)
Plastic MLPQ
LQ 38-Pin
RoHS Compliant / Pb-free
0 to 85
LX1675CLQ
-40 to 85
LX1675ILQ
Note: Available in Tape & Reel. Append the
letters “TR” to the part number. (i.e.
LX1675CLQ-TR)
ONE OF 3 PWM SECTIONS
Copyright © 2004
Rev. 1.2a, 2006-02-16
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
1 page LX1675
TM ® Multiple Output LoadSHARE™ PWM
PRODUCTION DATA SHEET
ELECTRICAL CHARACTERISTICS (CONTINUED)
For the LX1675ILQ the following specifications apply over the ambient temperature -40°C < TA < 85°C and for the LX1675CLQ 0°C <
TA < 85°C except where otherwise noted and the following test conditions: VIN & VSLR = 12V, VCX = 17V, HOX and LOX =3000pF
Load, FS = 0 (f = 300KHz).
Parameter
` INTERNAL 5V REGULATOR
Symbol
Test Conditions
LX1675
Units
Min Typ Max
Regulated Output
` UVLO AND SOFT-START (SS)
VCCL Internal + External Load: 0mA < IVCCL < 50mA 4.5
5.5 V
Start-Up Threshold
(VCX, VCCL, VIN)
Rising
3.75 4.38 V
Hysteresis
SS Input Resistance
RSS
SS Shutdown Threshold
VSHDN
Hiccup Mode Duty Cycle
` LINEAR REGULATOR CONTROLLER
CSS = 0.1µF
0.30 V
20 KΩ
100 mV
6%
Voltage Reference Tolerance
LDO Supply
IVSLR
VLDFB = 0.8V, COUT = 330µF
VSLR = 12V
3%
4 mA
LDO Gate Drive
VOH, Output Source Current = 0.5mA
VOH, Output Source Current = 10mA
7.35
9.0 V
Source Current
Sink Current
LDO Output Voltage Range
Regulator Disable Threshold
Line Regulation
Load Regulation
` LOGIC INPUTS
ILDGD
ILDGD
VOUT4
VSSL
VLDGD = 7.5V
VLDGD = 0.4V
Note 2, 1V < VLDO – VOUT4 < 10V,
IVOUT4 = 50mA
Note 2
10 mA
0.25 mA
0.8 5.25 V
100 mV
-1 1 %
-1 1 %
Threshold Logic High
2V
FS,SF
` THERMAL SHUTDOWN
TSD
Threshold Logic Low
Pulldown Resistance
Hiccup Mode Operation at Limit
0.8
100
160
V
KΩ
°C
Die Temperature
Note 1: X = Phase 1, 2, 3
Note 2: System Level Measurement; Closed Loop
Copyright © 2004
Rev. 1.2a, 2006-02-16
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 5
5 Page LX1675
TM ® Multiple Output LoadSHARE™ PWM
PRODUCTION DATA SHEET
THEORY OF OPERATION (CONTINUED)
L1,
Switch
Side
Phase 2
Error Amp
100 62k LPF1 RF2
Resistor
Divider
L2,
Switch Resistor
Side Divider
Not
Used
4700pF
FB2
62k LPF2 62k
100
TBD
4700pF
-
+5V @ 7W
1.5V
+46.7mV
PWM
Input
Offset
Voltage
Generator
V1
ESR L1
10mΩ
Phase 1
-
+
4.67A
Vou
1.5V @ 12A
18W
1.5V
+73.3mV
V2
ESR L2
10mΩ
Phase 2
7.33A
+3.3V @ 11W
Figure 8 – LoadSHARE Using Feedback Divider Offset
V1
Where V1 = 1.5467 ; V2 = 1.5733 and K = then
TBD = K × 100 = 5.814 K
V2 1−K
Copyright © 2004
Rev. 1.2a, 2006-02-16
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 11
11 Page |
Páginas | Total 19 Páginas | |
PDF Descargar | [ Datasheet LX1675.PDF ] |
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