Electronics
SAT8564
Point-of-Load Switching Regulator
4.5Vdc - 12Vdc Input, 1.21Vdc - 5.0Vdc Output, 5.5A
(Preliminary)
FEATURES
•
Input Range 4.5V to 12V
•
Rad-Tolerant to 100Krad (TID)
1
•
Adjustable or Fixed Output Voltage
•
Up to 5.5A Output Current
•
Fully Integrated assembly includes Inductor
•
Remote-Sense operation
•
Under-Voltage Lockout
•
Internal Soft Start
•
Current Limiting
•
Efficiencies up to 85%
•
120W/in
3
Power Density
DESCRIPTION
PRELIMINARY
The SAT8564 is a non-isolated PowerPac module for high reliability and full military distributed power, point
of load applications. Fully integrated, the SAT8564 includes buck controller, inductor, and input/output
capacitors integrated in a single package. The SAT8564 operates from an input voltage of +4.5V to +12V
providing step down power conversion to output voltages as low as 1.21V. Operating features include output
voltage adjust, output current limit, shutdown, external synchronization, soft start and under voltage lockout.
The SAT8564 can also be set up in a parallel configuration to increase output current capability.
Careful design and layout ensure excellent stability, transient response, and low noise operation. Packaged in a
compact 16-lead flat-pack the SAT8564 is manufactured in a facility certified to MIL-PRF-38534, class H & K
and operates over the full –55
o
C to +125
o
C temperature range.
ABSOLUTE MAXIMUM RATINGS
(Exceeding maximum ratings may damage the device)
Table.1
Symbol
Vin
Io
Pd
Rthjc
Tstg
Tj
Tsold
Parameter
DC input Voltage Vin-Vground
Output Current
Power Dissipation Tcase=25deg.C
Thermal Resistance, Junction to Case
Storage Temperature
Operating Temperature Range
Maximum Soldering Temperature, 10sec
Value
12
6
20
5.0
-65 to +150
-55 to +125
300
unit
V
A
W
o
C/W
o
C
o
C
o
C
SatCon Electronics
www.satcon.com
1
SAT8564 Preliminary Rev 8
ELECTRICAL CHARACTERISTICS @ Ta=-55deg.C to +125deg.C
(Unless Otherwise Specified)
Table 2.
Pre-Radiation
Symbol
Vout
Kvi
Kvo
Vin
Fsync
Vsync
Isc
Ishdn
Vshdn
Parameter
Output Voltage accuracy
Line Regulation
Load regulation
Input Voltage Range
Synchronizing Range
Sync input voltage, (note 4)
Short-circuit current Limit
Ripple Rejection
Shutdown Source Current
Shutdown Input Voltage
(Note 2,3)
Vin=5.0V,
F=120Hz, Iout=50mA
Vshdn=5.0V
Vin=5.0, Vout < 0.5V
0.4
55
75
Test Conditions
Min
Vin=5.0V, Iout=3.0A
+4.5V
≤
Vin
≤
+6.0V, Iout = 4A
Vin = 5V, 1A
≤
Iout
≤
4A
Iout=2.5A
4.5
580
1.5
6.0
Value
Typ
2.0
0.1
2.0
12
1000
2.2
Max
%
%
%
V
KHz
V
A
dB
uA
V
Units
Table 3.
Post-Radiation
(Projected)
Symbol
Vout
Kvi
Kvo
Isc
Ishdn
Vshdn
Parameter
Output Voltage Accuracy
Line Regulation
Load regulation
Short Current Limit
Shutdown Source Current
Shutdown Input Voltage
(Note 2,3)
Test Conditions
Min
Vin=5.0V, Iout=3.0A
+4.5V
≤
Vin
≤
+6.0V, Iout =
4A
Vin = 5V, 1A
≤
Iout
≤
4A
Vin=5.0V, Over current Latch
Up
Vshdn=5.0V
Vin=5.0, Vout < 0.5V;
0.4
Value
Typ
4.0
0.2
3.0
6.0
75
Max
%
%
%
A
uA
V
Units
Notes:
1. At this time, SatCon does NOT have a DSCC approved Radiation Program
2. Output Inhibit guaranteed @ Vshdn< 0.4V.
3. Shutdown input should be pulled up to Vin when not used.
4. Synch input should be grounded when not in use
SatCon Electronics
2
SAT8564 Preliminary Rev 8
Typical Performance Characteristics
Efficiency vs. Output Current
Vin= +5V
90.00%
Efficiency
85.00%
80.00%
75.00%
70.00%
0
1
2
3
4
5
+2.5V
+3.3V
Efficiency vs. Current
Vin= +5V
100.00%
80.00%
60.00%
40.00%
20.00%
0.00%
0
2
4
6
Output Current (A)
Efficiency
+1.8V
+1.5V
Output Current (A)
Output Ripple vs. Current
Vout= +3.3V
80
60
mV
40
20
0
0
1
2
3
4
Output Current (A)
Application Circuits
Figure 3.- Basic Fixed Regulator Version
SatCon Electronics
3
SAT8564 Preliminary Rev 8
Figure 4.- Adjustable Regulator Version
V
out
= V
ref
x (1+R
adj
/2490), with Vref~1.21 Volts
Table 4.- Commonly Available 1% resistor values
V
out
(V)
1.21
1.5
1.8
2.0
2.2
2.5
R
adj
(Ω)
0
590
1210
1620
2050
2670
V
out
(V)
2.8
3.0
3.3
3.5
3.8
4.0
R
adj
(Ω)
3240
3650
4320
4750
5360
5760
Figure 5.- Remote Sense Version
SatCon Electronics
4
SAT8564 Preliminary Rev 8
Fig 6- Parallel configuration schematic
(See Design Note for SAT8564 for further information)
SatCon Electronics
5
SAT8564 Preliminary Rev 8
