Electronics
SAT8565R/P/F/A
Point-of-Load Switching Regulator
4.5Vdc - 12Vdc Input, 3.5A Output Current
(Preliminary)
FEATURES
•
Input Range 4.5V to 12V
•
Adjustable or Fixed Output Voltage
•
Up to 3.7A Output Current
•
Integrated Input Capacitors
•
Variable Frequency Operation (note 1)
•
Remote-Sense operation
•
Internal Soft Start
•
Efficiencies up to 85%
DESCRIPTION
The SAT8565 is a non-isolated PowerPac module designed for high reliability and full military point of load
applications. Fully integrated, the SAT8565 includes buck controller, inductor, and input capacitors integrated
in a single package. The SAT8565 operates from an input voltage of +4.5V to +10V providing step down power
conversion to any output voltage from 1.21V to 5.0V. Operating features include output voltage adjust, output
current limit, shutdown, external synchronization and soft start. Careful design and layout ensure excellent
stability, transient response, and low noise operation. Packaged in a compact 5 Pin MO-078 package, the
SAT8565 is manufactured in a facility certified to MIL-PRF-38534 Class-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
Vshdn
Vsync
Tstg
Tj
Tsold
Parameter
DC input Voltage Vin-Vground
Output Current
Power Dissipation Tcase=25deg.C
Thermal Resistance, Junction to Case
Shutdown Pin Voltage
Sync Pin Voltage
Storage Temperature
Operating Temperature Range
Maximum Soldering Temperature, 10sec
Value
12.0
3.7
25
2.5
7.0
7.0
-65 to +150
-55 to +125
300
Unit
V
A
W
o
C/W
V
V
o
C
o
C
o
C
SatCon Electronics
www.satcon.com
1
SAT8565 Preliminary Rev 9
ELECTRICAL CHARACTERISTICS @ Ta=-55deg.C to +125deg.C
(Unless Otherwise Specified)
Table 2.
Pre-Radiation
Symbol
Vout
Kvi
Kvo
Vin
Vsync
Isc
Ishdn
Fsync
Vshdn
Parameter
Test Conditions
Min
Output Voltage accuracy Vin=5.0V, Iout=2.0A, Vo= Vref
Line Regulation
Load regulation
Input Voltage Range
Sync Input Voltage
Short-circuit current Limit Vin=5.0V,
Shutdown Source
Current
Vin=6.0V; Vshdn=0, Vsw=0
Synchronizing Range
1
Shutdown Input
Voltage
2,3
580
Vin=5.0, Vout < 0.5V
0.4
+4.5V
≤
Vin
≤
+6.0V, Iout = 3A
Vin = 5V, 1A
≤
Iout
≤
3A
Iout=2.5A
4.5
1.5
6.0
75
1000
Value
Typ
1.0
.1
1.0
12
2.2
Max
2.0
Units
%
%
%
V
V
A
uA
KHz
V
Notes:
1. Frequency of operation can be adjusted when using the Sync input, (table 1). This input should be
grounded when not in use.
2. Output Inhibit guaranteed @ Vshdn< 0.4V.
3. Shutdown pin may be pulled up to Vin (Rpullup≤ 5KΩ), when not in use.
SatCon Electronics
2
SAT8565 Preliminary Rev 9
Figure 3.- Adjustable Regulator Version
1
Vout = Vref x (1+Radj/2490), with Vref~1.21 Volts
Table 3.- Commonly Available 1% resistor values for various output Voltages
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 4.- Remote Sense Version
1
SatCon Electronics
4
SAT8565 Preliminary Rev 9
Figure 5.- Parallel Operation
(See SAT8565 Design Note for further information)
* ~1.5nF times the number of paralleled units if using electrolytic output capacitors, 22nF times if using
ceramic output capacitors.
SatCon Electronics
5
SAT8565 Preliminary Rev 9
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