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SC1144 View Datasheet(PDF) - Semtech Corporation

Part NameDescriptionManufacturer
SC1144 PROGRAMMABLE, HIGH PERFORMANCE MULTI-PHASE, PWM CONTROLLER Semtech
Semtech Corporation Semtech
SC1144 Datasheet PDF : 11 Pages
1 2 3 4 5 6 7 8 9 10
PROGRAMMABLE, HIGH PERFORMANCE
MULTI-PHASE, PWM CONTROLLER
SC1144
Preliminary - August 24, 1999
ELECTRICAL CHARACTERISTICS (Cont.)
Unless otherwise noted: TA = 25°C, VCC5V = 5V, VCC12V = 12V, 4-Phase operation.
PARAMETER
SYMBOL
CONDITIONS
Bgout Voltage
Bgout Impedance
External Clock Freq. Range
Oscillator Frequency Accuracy
Internal Clock Freq. Range
Match DRV0-3
PWM Off Time
VBgout
RO_Bg
Fext_CK
FOSC
Fint_CK
D
Toff
Vid = 00000
Iref = 250µA
Duty cycle deviation from Avg.
Drive Voltage Range
OutV
Overcurrent Comparator,
Comparator, Common Mode
Range
OC+I/P bias Current
OCC_CMR
IB_OC+
Output Freq. = 2MHz/Phase
VO = 2.000V
Vin = 5V,Roc+<20Kohm
OC-I/P bias Current
IB_OC-
Vin = 5V,Roc-<20Kohm
Input Offset Voltage
VOS_OCC
Vin = 5V
Feedback Input Impedance
Maximum Duty Cycle
Ri_FB
Dmax
VO = 2.00V
FB=0V
Mimimum Duty Cycle
Dmin
FB=4.0V
CONVERTER SPECIFICATIONS, Reference Application Circuit
Output Accuracy Over Set
Range
Load Regulation
Line Regulation
VOUT
VOUT
IO
VOUT
VIN
VID 0-4 = 0000-1111
VCC5V = 5.0V
VO = 2.000V
IO = 3A - 20A
VCC5V = 5V, VO = 2.000V
VIN = 4-6V, (vin separated from
Vcc5v) IO = 5A , Clk = external
MIN TYP MAX UNITS
2.05
V
3
K
.80 8.0 8.5 MHz
7.2 8.0 8.8 MHz
.80 8.0 8.5 MHz
-1
+1
%
25
%
5 10 12
V
3
15
V
+75 185 +250 µΑ
+75 125 +250 µΑ
10
mV
12
ΚΩ
75
%
0
%
-1
+1
%
.025 .05 %/A
%/V
.15
The SC1144 is patent pending
© 1999 SEMTECH CORP.
3
652 MITCHELL ROAD NEWBURY PARK CA 91320
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