Electronics
SAT8574A
Quad Point-of-Load Switching Regulator Module
4.5Vdc - 10Vdc Input, 3-15A Output Current
Preliminary
FEATURES
•
•
•
•
Adjustable Output Voltages
Integrated Input/ Output Capacitors and Inductors
Internal Soft Start
Up to 4 separate output Voltages
DESCRIPTION
The SAT8574 is a 4-channel, non-isolated module designed for high reliability and full military point of load
applications.
It is packaged in a high-grade plastic modular package that is conformally coated and potted internally
for improved reliability in high-stress environments.
This device can be used to provide up to 4 separate outputs at
4A each or one output at 15A. Fully integrated, the SAT8574 includes buck controllers, inductors, and
capacitors in a single package. The SAT8574 is optimized for an input voltage of +4.5V to +6V providing
efficient step down power conversion for output voltages as low as 1.21V. Operating features include output
voltage adjust, output current limit, shutdown and low output ripple. Careful design and layout ensure excellent
stability, transient response, and low noise operation.
ABSOLUTE MAXIMUM RATINGS
(Exceeding maximum ratings may damage the device)
Table.1
Symbol
Vin
Pd
Rthjc
Vshdn
Vsync
Tstg
Tj
Tsold
Parameter
DC input Voltage Vin-Vground
Power Dissipation Tcase=25deg.C, (per channel)
Thermal Resistance, Junction to Case- (Per regulator circuit)
5
Shutdown Pin Voltage
Sync Pin Voltage
Storage Temperature
Operating Temperature Range
Maximum Soldering Temperature, 10sec
Value
15.0
10
4.5
7.0
7.0
-65 to +150
-40 to +105
300
Unit
V
W
o
C/W
V
V
o
C
o
C
o
C
SatCon Electronics
www.satcon.com
1
SAT8574A Preliminary Rev 1
ELECTRICAL CHARACTERISTICS @ Ta=-55deg.C to +125deg.C
(Unless Otherwise Specified)
Table 2.
(Per channel)
Symbol
Parameter
Test Conditions
Min
Vout
Kvi
Kvo
Vin
Vr
Isc
Ishdn
Vshdn
Output Voltage accuracy
Line Regulation
Load regulation
Input Voltage Range
Output ripple
Short-circuit current Limit
(per channel)
Shutdown Source Current
Shutdown Input Voltage
1,2
Vin=5.0V, Iout=3.0A, Vo= Vref
+4.5V
≤
Vin
≤
+6.0V, Iout = 3A
Vin = 5V, 1A
≤
Iout
≤
3A
Iout= 3.0A
4.5
30
Vin=5.0V, Vo= < 0.5V
Vin=6.0V; Vshdn=0, Vsw=0
Vin=5.0, Vout < 0.5V
0.4
6.0
75
Value
Typ
1.0
.1
1.0
10
50
Max
2.0
Units
%
%
%
V
mV
A
uA
V
Notes:
1. Output Inhibit guaranteed @ Vshdn< 0.4V.
2. Shutdown pin must be pulled up to Vin (Rpullup≤ 5KΩ), when not in use.
3. For regulators in parallel, the thermal resistance = (θj-c/# of regulators in parallel). Therefore, 4 regulators
in parallel would have a Maximum
θj-c=
1.125
o
C/W.
SatCon Electronics
2
SAT8574A Preliminary Rev 1
Efficiency (%) Versus Load (A) Curves (Vin = 5V)
90
85
80
75
70
65
60
0.00
90
85
80
75
70
65
60
0.00
4.00
9.00
14.0
18.0
4.00
9.00
14.0
18.0
Figure 1. Efficiency Vin = 5V Vout =
3.3V
90
85
80
75
70
65
60
0.00
Figure 2. Efficiency Vin = 5V Vout =
2.5V
90
85
80
75
70
65
60
0.00
4.00
9.00
14.0
18.0
4.00
9.00
14.0
18.0
Figure 3. Efficiency Vin = 5V Vout =
1.8V
Figure 4. Efficiency Vin = 5V Vout =
1.5V
SatCon Electronics
3
SAT8574A Preliminary Rev 1
Load Transients (Voltage Versus Time)
Volts
Amps
Volts
Amps
Figure 6. 10-90-10% Load Transient
Response (
500mV/div, 1ms/div)
Figure 7. 25-50-25% Load Transient
Response (
500mV/div, 1ms/div)
Volts
Amps
Figure 8. 50-75-50% Load Transient
Response (
500mV/div, 1ms/div)
SatCon Electronics
4
SAT8574A Preliminary Rev 1
Application Circuits
Radj
Radj
Radj
Figure 3.- Adjustable Regulator- Four Single Channels
Vout
= Vref x (1+Radj/2490), with Vref~1.21 Volts
SatCon Electronics
5
SAT8574A Preliminary Rev 1
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