Electronics
SAT8565R/P/F/A
Point-of-Load Switching Regulator
4.5Vdc - 6Vdc Input, 1.21Vdc - 5.0Vdc Output, 3.5A
(Preliminary)
FEATURES
•
Input Range 4.5V to 6V
•
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%
•
Thermal Resistance (θjc) 4
o
C/W
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/output capacitors
integrated in a single package. The SAT8565 operates from an input voltage of +4.5V to +6V 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-H and operates over the full
–55
o
C to +125
o
C temperature range. This product is offered in a variety of screening levels. See p/n guide
(last page) for all variations.
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
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SAT8565 Preliminary Web Rev 1
ELECTRICAL CHARACTERISTICS @ Ta=-55deg.C to +125deg.C
(Unless Otherwise Specified)
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
6
2.2
Max
2.0
Units
%
%
%
V
V
A
uA
KHz
V
Typical Performance Characteristics
Output Ripple vs. Current
Vout= +2.5V
80
Vr (mV)
60
40
20
0
0
1
2
Output Current (A)
3
4
84.00%
82.00%
80.00%
78.00%
76.00%
0
Efficiency , Vout= +2.5V
0.5
1
1.5
Am ps
2
2.5
3
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. Shut-down pin may be pulled up to Vin (Rpullup≤ 5KΩ), when not in use.
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SAT8565 Preliminary Web Rev 1
Application Circuits
Figure 1.- Basic Fixed Regulator Version
1
Figure 2.- Adjustable Regulator Version
1
Vout = Vref x (1+Radj/2490), with Vref~1.21 Volts
Table 4.- 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
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SAT8565 Preliminary Web Rev 1
Figure 3.- Remote Sense Version
1
* ~1.5nF times the number of paralleled units if using electrolytic output capacitors, 22nF times if using
ceramic output capacitors.
Figure 4.- Parallel Operation
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SAT8565 Preliminary Web Rev 1
PACKAGE OUTLINE
Table 4a- Pin Assignments (For SAT8565R/F/A units)
Pin No
1
2
3
4
5
Pin Name
Vin
GND
Vout
SHDN
Adjust/
Remote/Synch
Pin Description
Input Voltage
Ground
Output Voltage
Shutdown Pin. Output reset occurs when Vshdn< 0.4V
Adjust pin for Adjustable Output (SAT8565A) ; Remote
Sense for SAT8565R; Synch input for SAT8565F
Table 4b- Pin assignments for parallel configuration, (SAT8565P).
Pin No
1
2
3
4
5
Pin Name
Vin
FB
Vout
Synch
Vc
Pin Description
Input Voltage
Feedback Pin
Output Voltage
Sync Pin.
Compensation Pin
ORDERING INFORMATION:
SAT8565A
Product Number
R= Remote Sense Version
P= Parallel Version
F= Fixed Version
A= Adjustable Version
-3
Current Designation
- 3 = 3A Version
H
Screening Level
T
Package Type
T = MO-078
H = Class-H Compliant (MIL-
PRF-38534)
Blank
= SatCon Commercial screening
EM = Eng. Model
-Adj
Output Voltage
- 1.3 = 1.3V Fixed
- 1.8 = 1.8V Fixed
- 2.5 = 2.5V Fixed
- 3.3 = 3.3V Fixed
- 5.0 = 5.0V Fixed
-ADJ = Adjustable Version
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SAT8565 Preliminary Web Rev 1
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