PRODUCTION D
TA SHEET
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 4
Copyright © 2000
Rev. 1.0, 2005-08-10
WWW.Microsemi .COM
LX1672
Multiple Output LoadSHARE™ PWM
TM
®
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, the following specifications apply over the operating ambient temperature 0°C ≤ T
A
≤ 70°C except where
otherwise noted and the following test conditions: V
CC
= 5V, V
CCL
= 5V, V
CX
= 12V, HOX = LOX = 3000pF Load.
LX1672
Parameter Symbol Test Conditions
Min Typ Max
Units
`
SWITCHING REGULATORS
Input Voltage V
CC
4.5 5.5 V
Input Voltage
V
CCL,
V
CX
12 V
Operation Current I
CC
Static and Dynamic 10 mA
T
A
= 25°C 0.792 0.8 0.808
Reference Voltage V
SS
0°C <
T
A
< 70°C 0.784 0.816
V
Line Regulation (Note 2) -1 1 %
Load Regulation (Note 2) -1 1 %
Minimum Pulse Width TSSOP Package 250 nS
Minimum Pulse Width MLPQ Package 150 nS
Maximum Duty Cycle LX1672-03 Load = 3000pF 85 %
Maximum Duty Cycle
LX1672-05 Load = 3000pF
75 %
Maximum Duty Cycle
LX1672-06 Load = 3000pF
70 %
`
ERROR AMPLIFIERS
Input Offset Voltage Vos Common Mode Input Voltage = 1V -6.0 6.0 mV
DC Open Loop Gain 70 dB
Unity Gain Bandwidth UGBW 16 MHz
High Output Voltage V
OH
I Source = 2mA 3.5 3.8 V
Low Output Voltage V
OL
I Sink = 10µA 200 400 mV
Input Common Mode Range Input Offset Voltage < 20mV .1 3.5 V
Input Bias Current I
IN
0 and 3.5 V Common Mode Input Voltage 100 nA
`
CURRENT SENSE
Current Sense Bias Current I
SET
V
CSX
= V
VSX
– 0.3V , V
VSX
= 5V 45 50 55
μA
Trip Threshold V
TRIP
Referenced to VSX , V
VSX
= 5V
260 300 340 mV
Current Sense Delay T
CSD
350 nS
Current Sense Comparator
Operating Current
I
CSX
Current into VSX pins 2 5 mA
`
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 Time, Fall Time T
RF
C
L
= 3000pF 50 nS
High Level Output Voltage V
DH
I
SOURCE
= 20mA, V
CCL
= 12V
10 11 V
Low Level Output Voltage V
DL
I
SINK
= 20mA, V
CCL
= 12V
0.15 0.25 V
`
OSCILLATOR
PWM Switching Frequency LX1672-03 255 300 345 KHz
PWM Switching Frequency LX1672-05 425 500 575 KHz
PWM Switching Frequency
F
SW
LX1672-06 510 600 690 KHz
Ramp Amplitude V
RAMP
1.25 V
PP
E
E
L
L
E
E
C
C
T
T
R
R
I
I
C
C
A
A
L
L
S
S
