4707 Dey Road Liverpool, N.Y. 13088
M.S.KENNEDY CORP.
(315) 701-6751
FEATURES:
-5V, -5.2V, -10V, -12V and -15V Standard Versions
Low Dropout Voltage
Output Current to 3 Amps
Output Voltage Internally Set to 1% MAX.
Internal Short Circuit Current Limit
Internal Thermal Overload Protection
Lead Form Options: Straight, Up, Down and Gull Wing
Alternate Output Voltages Available
Available with Top Tab or Tabless Package
High Efficiency Linear Regulators
Constant Voltage/Current Regulators
System Power Supplies
Switching Power Supply Post Regulators
TYPICAL APPLICATIONS
PIN-OUT INFORMATION
1
2
3
GND
VIN
VOUT
5332
SERIES
NEGATIVE, 3 AMP,
LOW DROPOUT
VOLTAGE REGULATOR
DESCRIPTION:
The MSK 5332 is a fixed, negative voltage regulator which offers low dropout and output voltage accuracy to 1%
maximum. The low
jc combined with low dropout allows increased output current and excellent device efficiency. The
MSK 5332 offers both internal current limit and thermal overload protection. The case of the device is electrically isolated
for heat sinking purposes. The device is packaged in a space efficient 3 pin power package with various lead form options.
The MSK 5332 series is also available in a power package with a top tab to accomodate direct mounting to a heat sink.
ISO-9001 CERTIFIED BY DSCC
EQUIVALENT SCHEMATIC
MIL-PRF-38534 CERTIFIED
1
Rev. B 8/05
NO TAB
TOP TAB
%
%
V
%
%
%
%
mA
mA
A
dB
C/W
PART
NUMBER
Dropout Voltage
Short Circuit Current
Ripple Rejection
Thermal Resistance
Max.
1.0
2.0
1.2
1.0
2.0
0.5
0.75
10
10
-3.3
-
7.0
Storage Temperature Range
Lead Temperature Range
(10 Seconds)
Case Operating Temperature
MSK 5332H/E
MSK 5332
-30V
Internally Limited
-3A
+175C
-65C to +150C
300C
-55C to +125C
-40C to +85C
ABSOLUTE MAXIMUM RATINGS
T
ST
T
LD
T
C
Input Voltage (WRT V
OUT
)
Power Dissipation
Output Current
Junction Temperature
-V
IN
P
D
I
OUT
T
J
Output is decoupled to ground using 33F minimum, low ESR capacitors unless otherwise specified.
Guaranteed by design but not tested. Typical parameters are representative of actual device
performance but are for reference only.
All output parameters are tested using a low duty cycle pulse to maintain T
J
= T
C
.
Industrial grade and "E" suffix devices shall be tested to subgroup 1 unless otherwise specified.
Military grade devices ("H" suffix) shall be 100% tested to subgroups 1,2 and 3.
Subgroup 1 T
A
=T
C
=+25C
2 T
A
=T
C
=+125C
3 T
A
=T
C
=-55C
Please consult the factory if alternate output voltages are required.
Input voltage (V
IN
= V
OUT
+ a specified voltage) is implied to be more negative than V
OUT
.
Min.
-
-
-
-
-
-
-
-
-
-
60
-
Group A
Subgroup
1
2,3
1
1
2,3
1
2,3
1
2,3
-
-
-
Min.
-
-
-
-
-
-
-
-
-
-
60
-
Typ.
0.1
0.1
0.8
0.2
0.3
0.1
0.2
4.5
4.5
-3.6
75
5.6
Typ.
0.1
-
0.8
0.2
-
0.1
-
4.5
-
-3.6
75
5.6
Max.
2.0
-
1.3
2.0
-
0.6
-
12
-
-3.0
-
7.5
Parameter
ELECTRICAL SPECIFICATIONS
Test Conditions
Units
MSK 5332
MSK 5332H/E
3
2
2
0A
I
OUT
3A;
V
OUT
=1%
10mA
I
OUT
3A
V
IN
=V
OUT
+3V
I
OUT
=10mA
(V
OUT
+3V)
V
IN
(V
OUT
+15V)
V
IN
=V
OUT
+5V
I
OUT
=3A; C
OUT
=25F; f=120Hz
JUNCTION TO CASE @ 125C
-5.0V
-5.2V
-10.0V
-12.0V
-15.0V
MSK5332-5.0
MSK5332-5.2
MSK5332-10
MSK5332-12
MSK5332-15
OUTPUT VOLTAGE
7
2
Rev. B 8/05
1
2
3
4
5
6
7
8
2
NOTES:
Output Voltage Tolerance
Load Regulation
Line Regulation
I
OUT
=10mA; V
IN
=V
OUT
+3V
Quiescent Current
V
IN
=V
OUT
+3V; I
OUT
=10mA
2
APPLICATION NOTES
HEAT SINKING
To determine if a heat sink is required for your application
and if so, what type, refer to the thermal model and govern-
ing equation below.
Governing Equation: Tj = Pd x (R
jc + R
cs + R
sa) + Ta
WHERE
Tj = Junction Temperature
Pd = Total Power Dissipation
R
jc = Junction to Case Thermal Resistance
R
cs = Case to Heat Sink Thermal Resistance
R
sa = Heat Sink to Ambient Thermal Resistance
Tc = Case Temperature
Ta = Ambient Temperature
Ts = Heat Sink Temperature
EXAMPLE:
This example demonstrates an analysis where the regulator is at
one-half of its maximum rated power dissipation, which occurs
when the output current is at 1.5 amps.
Conditions for MSK 5332-5:
Vin = -7.0V; Iout = -1.5A
1.) Assume 45 heat spreading model.
2.) Find regulator power dissipation:
Pd = (Vin - Vout)(Iout)
Pd = (-7-(-5))(-1.5)
= 3.0W
3.) For conservative design, set Tj = +125C Max.
4.) For this example, worst case Ta = +90C.
5.) R
jc = 7.0C/W from the Electrical Specification Table.
6.) R
cs = 0.15C/W for most thermal greases.
7.) Rearrange governing equation to solve for R
sa:
R
sa =
((Tj - Ta)/Pd) - (R
jc) - (R
cs)
=
(125C - 90C)/3.0W - 7.0C/W - 0.15C/W
=
4.5C/W
In this case the result is 4.5C/W. Therefore, a heat sink with a
thermal resistance of no more than 4.5C/W must be used in
this application to maintain the regulator junction temperature
under 125C.
OVERLOAD SHUTDOWN
The MSK 5332 features both power and thermal overload
protection. When the maximum power dissipation is not ex-
ceeded, the regulator will current limit slightly above its 3 amp
rating. As the Vin-Vout voltage increases, however, shutdown
occurs in relation to the maximum power dissipation curve. If
the device heats enough to exceed its rated die junction tem-
perature due to excessive ambient temperature, improper heat
sinking etc., the regulator will shutdown until an appropriate
junction temperature is maintained. It should also be noted that
in the case of an extreme overload, such as a sustained direct
short, the device may not be able to recover. In these instances,
the device must be shut off and power reapplied to eliminate the
shutdown condition.
LOAD REGULATION
For best results the ground pin should be connected directly
to the load as shown below, this effectively reduces the ground
loop effect and eliminates excessive voltage drop in the sense
leg. It is also important to keep the output connection between
the regulator and the load as short as possible since this directly
affects the load regulation. For example, if 20 gauge wire were
used which has a resistance of about .008 ohms per foot, this
would result in a drop of 8mV/ft at 1Amp of load current. It is
also important to follow the capacitor selection guidelines to
achieve best performance. Refer to Figure 1 for connection dia-
gram.
BYPASS CAPACITORS
For most applications a 33uF minimum, low ESR (0.5-2 ohm)
tantalum capacitor should be attached as close to the regulator's
output as possible. This will effectively lower the regulator's
output impedance, increase transient response and eliminate any
oscillations that are normally associated with low dropout regu-
lators. Additional bypass capacitors can be used at the remote
load locations to further improve regulation. These can be either
of the tantalum or the electrolytic variety. Unless the regulator
is located very close to the power supply filter capacitor(s), a
4.7uF minimum low ESR (0.5-2 ohm) tantalum capacitor should
also be added to the regulator's input. An electrolytic may also
be substituted if desired. When substituting electrolytic in place
of tantalum capacitors, a good rule of thumb to follow is to
increase the size of the electrolytic by a factor of 10 over the
tantalum value.
Low Dropout Negative Power Supply
MSK 5332 TYPICAL APPLICATION:
FIGURE 1
3
Rev. B 8/05
PDF 
ZIP
