LX1675
PRODUCTION DATA SHEET
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 4
Copyright © 2004
Rev. 1.2a, 2006-02-16
WWW.Microsemi .COM
Multiple Output LoadSHARE™ PWM
TM
®
ELECTRICAL CHARACTERISTICS
For the LX1675ILQ the following specifications apply over the ambient temperature -40°C < TA < 85°C and for the LX1675CLQ 0°C
T
A
≤ 85°C except where otherwise noted and the following test conditions: V
IN
& VSLR = 12V, V
CX
= 17V, HOX and LOX =3000pF
Load, FS = 0 (f = 300KHz).
LX1675
Parameter Symbol Test Conditions
Min Typ Max
Units
` SWITCHING REGULATORS
VIN
Regulator Functional 4.5 24
VCX
30
Input Voltage
VCCL
6
V
Operation Current I
VIN
Static 6 mA
Feedback Voltage Internal
Reference
V
FB
4.5V < VIN < 12V 0.784 0.816 V
Line Regulation
-1 1 %
Load Regulation
System Level measurement, Closed Loop -1 1 %
High Side Minimum Pulse Width
Load = 3000pF 50 nS
600kHz 74 %
Maximum Duty Cycle PWM
DC
85 %
Lox Minimum On Time VLOx @ 25°C from 3V going high to 1V going low 180 225 320 nS
Buffered Reference Voltage V
REF
Max Load Current 0.5mA 0.778 0.822 V
` ERROR AMPLIFIER
Input Offset Voltage V
OS
Common Mode Input Voltage = 1V -7.0 7.0 mV
DC Open Loop Gain
70 dB
Unity gain bandwidth AV
UGBW
10 MHz
High Output Voltage V
OH
I Source = 2mA 3.75 5.0 V
Low Output Voltage V
OL
I Sink = 100µA 100 mV
Input Common Mode Range
Input Offset Voltage < 20mV 0.1 3.5 V
Input Bias Current I
IN
0V and 3.5V Common Mode Voltage 100 nA
` CURRENT SENSE
CS Bias Current (Source) I
SET
V
CSX
= -0.2V, V
PGX
= 0V @ 25°C
48 55 62 µA
CS Trip Threshold V
TRIP
Referenced to V
CSX
, V
PGX
= 0V
±3 mV
CS Delay (Blanking) T
CSD
150 nS
V
IH
Any PWM Output Activating Current Limit for
More than 4 Clock Cycles, Soft Starts all PWM
Outputs
2
Shared Fault Mode
V
IL
Current Limit Event of One PWM Does Not Effect
the Continued Function of the Two Other PWM
Regulators
0.8
V
` OUTPUT DRIVERS – N Channel MOSFETS
Low Side Driver Operating Current I
VCCL
Static 2.5 mA
High Side Driver Operating Current I
VCX
Static 3 mA
Drive Rise and Fall Time T
R/F
C
L
= 3000pF 50 nS
Dead Time – High Side to Low Side
or Low Side to High Side
T
DEAD
Drive Load = 3000pF, V
DRIVE
< 1V 50 nS
High Side Driver Voltage
Drive High I
HOx
= 20mA, VCx – HRx = 5.0V 4.8 4.9
Drive Low
V
HOx
I
HOx
= -20mA, VCx – HRx = 5.0V 0.1 0.2
V
Low Side Driver Voltage
Drive High I
LOx
= 20mA, VCCL – PGx = 5.0V 4.8 4.9
Drive Low
V
LOx
I
LOx
= -20mA, VCCL – PGx = 5.0V 0.1 0.2
V
High Side Driver Current I
HOx
VCx – HRx = 5.0V, Capacitive Load, PW < 200ns ±1 A
PEAK
Low Side Driver Current I
LOx
VCCL – PGx = 5.0V, Capacitive Load, PW <
200ns
±1.5 A
PEAK
Maximum Load Qg
MAX
50 nC
` OSCILLATOR
V
FS
<0.8V @ 25°C
255 300 345 KHz
PWM Switching Frequency F
SW
V
FS
>2V @ 25°C
510 600 690 KHz
Ramp Amplitude VRAMP 1.6 VPP
E
E
L
L
E
E
C
C
T
T
R
R
I
I
C
C
A
A
L
L
S
S
