MSK5921ERHU [MSK]
Adjustable Positive LDO Regulator, 1.5V Min, 6V Max, 0.4V Dropout, PSFM5, HERMETIC SEALED, SIP-5;型号: | MSK5921ERHU |
厂家: | M.S. KENNEDY CORPORATION |
描述: | Adjustable Positive LDO Regulator, 1.5V Min, 6V Max, 0.4V Dropout, PSFM5, HERMETIC SEALED, SIP-5 局域网 输出元件 调节器 |
文件: | 总7页 (文件大小:236K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
MIL-PRF-38534 CERTIFIED
RAD HARD ULTRA LOW
DROPOUT ADJ USTABLE
POSITIVE LINEAR REGULATOR
5921RH
M.S.KENNEDY CORP.
4707 Dey Road Liverpool, N.Y. 13088
(315) 701-6751
FEATURES:
Total Dose Tested to 300K RAD (Method 1019.7 Condition A)
Ultra Low Dropout for Reduced Power Consumption
External Shutdown
Latching Overload Protection
Adjustable Output Using Two External Resistors
Output Current Limit
Available in 3 Lead Form Options: Straight, Up and Down
Available as SMD 5962R05220
RAD Certified by DSCC
DESCRIPTION:
The MSK 5921RH is a radiation hardened adjustable linear regulator typically capable of delivering 5.0 amps of
output current. The typical dropout is only 0.30 volts with a 3.0A load. An external shutdown function is ideal for
power supply sequencing. This device also has latching overload protection that requires no external current sense
resistor. The MSK 5921RH is radiation hardened and specifically designed for space/satellite applications. The device
is packaged in a hermetically sealed space efficient 5 pin SIP that is electrically isolated from the internal circuitry
allowing for direct heat sinking.
EQUIVALENT SCHEMATIC
TYPICAL APPLICATIONS
PIN-OUT INFORMATION
Satellite System Power Supplies
Switching Power Supply Post Regulators
Constant Voltage/Current Regulators
Microprocessor Power Supplies
1 VIN
2 GND
3 VOUT
4 SHUTDOWN
5 ADJ UST
Rev. K 12/09
1
8
ABSOLUTE MAXIMUM RATINGS
+ VIN
IOUT
TC
Supply Voltage
Output Current
Case Operating Temperature Range
+ 10V
5A
TST
TLD
Storage Temperature Range -65° C to + 150° C
7
Lead Temperature Range
(10 Seconds)
300° C
MSK5921K/H/E RH
MSK5921RH
-55° C to + 125° C
-40° C to + 85° C
PD
TC
Power Dissipation
J unction Temperature
See SOA Curve
150° C
12
ELECTRICAL SPECIFICATIONS
Group A
MSK5921K/H/E
MSK5921
11
1
Test Conditions
Parameter
Units
Typ.
Subgroup Min.
Max. Min.
Typ.
Max.
Input Voltage Range
-
-
2
10mA ≤ IOUT ≤ 1.0A
1
2,3
1
2.9
6.5
6.5
2.9
-
6.5
V
V
-
2.9
-
-
Feedback Voltage
1.265
1.265
IOUT= 1A R1= 187Ω
1.225
1.305 1.202
1.328
V
-
2,3
1
1.225
1.305
1.315
5.0
20
-
-
-
-
V
Post Radiation
-
1.215
-
-
V
2
Feedback Pin Current
Quiescent Current
-
14
14
± 0.01
-
-
VFB= 1.265V 10mA ≤ IOUT ≤ 3.0A
VIN= 6.5V
1,2,3
1
0
-
0
5.0
20
-
µA
mA
mA
-
14
-
Not Including IOUT
2,3
1
-
20
-
9
Line Regulation
0.01
IOUT= 50mA
-
± 0.50
± 2.5
± 0.80
± 2.5
0.40
0.40
10
-
± 0.60 % VOUT
% VOUT
± 1.0 % VOUT
-
-
VOUT+ 0.4V ≤ VIN ≤ IOUT+ 1.3V
50mA ≤ IOUT ≤ 3.0A
2,3
1
-
-
9
Load Regulation
± 0.06
-
0.06
-
-
2,3
1
-
-
-
-
-
% VOUT
V
1 0
0.22
0.26
8
Dropout Voltage
0.22
Delta FB= 1% IOUT= 2.5A
-
0.45
2,3
1
-
-
-
8
-
10
-
V
2
Minimum Output Current
-
mA
mA
V
2.9V ≤ VIN ≤ 6.5V
R1= 187Ω
-
9
2,3
-
-
10
-
-
2
Output Voltage Range
Output Current Limit
1.5
3.0
3.0
1.0
1.0
65
65
30
10
-
-
-
VIN= 6.5V
6.0
5.0
5.0
1.6
1.6
-
1.5
3.0
-
6.0
5.0
-
7
4.0
4.0
1.3
1.3
-
4.0
-
A
VIN= 3.5V VOUT= 2.5V
1
2,3
1
A
Shutdown Threshold
1.3
-
V
VOUT ≤ 0.2V (OFF)
VOUT= Nominal (ON)
f= 120Hz
1.0
-
1.6
-
2,3
4
V
2
Ripple Rejection
-
dB
65
-
-
-
-
-
dB
IOUT =50mA
5,6
4,5,6
4,5,6
4,5,6
-
-
2
Phase Margin
Gain Margin
70
18
-
70
18
-
degrees
dB
-
30
10
-
-
2
-
-
2
Equivalent Noise Voltage
µVRMS
° C/W
Referred to Feedback Pin
50
50
4.0
Thermal Resistance
2
-
2.2
2.2
J unction to Case @ 125° C Output Device
4.0
-
NOTES:
1
2
3
4
5
6
Unless otherwise specified, VIN= 5.0V, R1= 1.62K, VSHUTDOWN= 0V and IOUT= 10mA. See Figure 2, typical application circuits.
Guaranteed by design but not tested. Typical parameters are representative of actual device performance but are for reference only.
Industrial grade and "E" suffix devices shall be tested to subgroups 1 and 4 unless otherwise requested.
Military grade devices ("H" suffix) shall be 100% tested to subgroups 1,2,3 and 4.
Subgroup 5 and 6 testing available upon request.
Subgroup 1,4
Subgroup 2,5
Subgroup 3,6
TC= + 25° C
TC= + 125° C
TA= -55° C
7
8
9
Output current limit is dependent upon the values of VIN and VOUT. See Figure 1 and typical performance curves.
Continuous operation at or above absolute maximum ratings may adversely effect the device performance and/or life cycle.
VIN shall be as specified or VIN Min, whichever is greater.
10
11
12
Not applicable when VOUT< VIN Min - dropout voltage maximum.
Pre and post irradiation limits, up to 100Krad TID, are identical unless otherwise specified.
Reference DSCC SMD 5962R05220 for electrical specifications for devices purchased as such.
Rev. K 12/09
2
APPLICATION NOTES
PIN FUNCTIONS
OUTPUT CAPACITOR SELECTION
Output capacitors are required to maintain regulation
and stability. A 220µF surface mount tantalum capacitor
from the output to ground should suffice under most
conditions. Ceramic output capacitors should be kept to
a minimum (0.1µF typical) and placed directly across the
load power connections as close to the load as possible.
If the user finds that tighter voltage regulation is needed
during output transients, more capacitance may be added.
If more capacitance is added to the output, the band-
width may suffer.
VIN - This pin provides power to all internal circuitry
including bias, start-up, thermal limit and overcurrent
latch. Input voltage range is 2.9V to 6.5V.
GND - Internally connected to ground, this pin should be
connected externally by the user to the circuit ground.
SHUTDOWN - There are two functions to the SHUT-
DOWN pin. It may be used to disable the output voltage
or to reset a current latch condition. To activate the shut-
dow n/reset functions the user must apply a voltage
greater than 1.6V to the SHUTDOWN pin. The output
voltage will turn on when the SHUTDOWN pin is pulled
below the threshold voltage. If the SHUTDOWN pin is
not used, it should be connected to ground. It should be
noted that with the shutdown pin tied to ground, a cur-
rent latch condition can only be reset by cycling power
off, then on.
VOUT - This is the output pin for the device.
ADJ UST - The ADJ UST pin is the inverting input of the
internal error amplifier. The non-inverting input is con-
nected to an internal 1.265V reference. This error ampli-
fier controls the drive to the output transistor to force
the ADJ UST pin to 1.265V. An external resistor divider
is connected to the output, ADJ UST pin and ground to
set the output voltage.
OVERCURRENT LATCH
Overcurrent protection is provided by the MSK5921RH
series through the use of a timed latch off circuit. The
internal latch timeout is triggered by an overcurrent con-
dition. To allow for start up surge currents, the timeout
is approximately 5.5mS at 25° C. If the overcurrent con-
dition remains at the end of the timeout cycle, the regu-
lator will latch off until the latch is reset. Reset the latch
by pulling the shutdown pin high or cycling VIN off then
back on. A thermal limit condition will trigger the latch
with no time out delay.
FIGURE 1
CURRENT LIMIT AND SOA
The MSK 5921RH current limit function is directly af-
fected by the input and output voltages. Figure 1 illus-
trates the relationship between VIN and ICL for various
output voltages. It is very important for the user to con-
sult the SOA curve when using input voltages which
result in current limit conditions beyond 4.5 Amps. When
using input voltages which result in current limit above
4.5 Amps, the user must maintain output current within
the SOA curve to avoid damage to the device. Note that
5 Amp maximum is due to current carrying capability of
the internal wirebonds.
INPUT POWER SUPPLY BYPASSING
To maximize transient response and minimize power
supply transients it is recommended that a 100µF tanta-
lum capacitor is connected between VIN and ground. A
0.1µF ceramic capacitor should also be used for high
frequency bypassing.
3
Rev. K 12/09
TYPICAL APPLICATIONS CIRCUIT
APPLICATION NOTES CONT.
THERMAL LIMITING
The MSK 5921RH control circuitry has a thermal shut-
down temperature of approximately 150° C. This ther-
mal shutdown can be used as a protection feature, but
for continuous operation, the junction temperature of the
pass transistor must be maintained below 150° C. Proper
heat sink selection is essential to maintain these condi-
tions. Exceeding the thermal limit activates the latch fea-
ture of the MSK 5921RH. Toggle the shutdown pin high
then low or cycle power to reset the latch. See SHUT-
DOWN pin description and overcurrent latch description
for more information.
HEAT SINK SELECTION
To select a heat sink for the MSK 5921RH, the follow-
ing formula for convective heat flow may be used.
OUTPUT VOLTAGE SELECTION
Governing Equation:
TJ = PD X (RθJ C + RθCS + RθSA) + TA
As noted in the above typical applications circuit, the
formula for output voltage selection is
Where
R1
R2
TJ
PD
= J unction Temperature
= Total Power Dissipation
1+
VOUT= 1.265
RθJ C = J unction to Case Thermal Resistance
RθCS = Case to Heat Sink Thermal Resistance
RθSA = Heat Sink to Ambient Thermal Resistance
A good starting point for this output voltage selection is
to set R2= 1K. By rearranging the formula it is simple to
calculate the final R1 value.
TA
= Ambient Temperature
VOUT
1.265
R1= R2
-1
Power Dissipation= (VIN-VOUT) x IOUT
Table 1 below lists some of the most probable resistor
combinations based on industry standard usage.
Next, the user must select a maximum junction tem-
perature. The absolute maximum allowable junction tem-
perature is 150° C. The equation may now be rearranged
to solve for the required heat sink to ambient thermal
resistance (RθSA).
TABLE 1
R1 (nearest 1% )
(Ω)
R2
(Ω)
1K
1K
1K
1K
1K
1K
1K
1K
OUTPUT VOLTAGE
(V)
187
422
576
976
1.21K
1.62K
2.15K
2.94K
1.5
1.8
2.0
2.5
2.8
3.3
4.0
5.0
Example:
An MSK 5921RH is connected for VIN= + 3.3V and
VOUT= + 2.5V. IOUT is a continuous 3A DC level. The am-
bient temperature is + 25° C. The maximum desired junc-
tion temperature is + 125° C.
RθJ C= 4.0° C/W and RθCS= 0.15° C/W for most thermal
greases
Power Dissipation= (3.3V-2.5V) x (3A)
TOTAL DOSE RADIATION TEST
PERFORMANCE
= 2.4Watts
Solve for RθSA:
Radiation performance curves for TID testing have been
generated for all radiation testing performed by MS
Kennedy. Thes e curves s how performance trends
throughout the TID test process and can be located in
the MSK 5921RH radiation test report. The complete
radiation test report is available in the RAD HARD PROD-
UCTS section on the MSK website.
125° C - 25° C
RθSA=
-4.0° C/W - 0.15° C/W
2.4W
= 36.5° C/W
In this example, a heat sink with a thermal resistance
of no more than 36.5° C/W must be used to maintain a
junction temperature of no more than 125° C.
http://www.mskennedy.com/store.asp?pid=9951&catid=19680
4
Rev. K 12/09
TYPICAL PERFORMANCE CURVES
5
Rev. K 12/09
TYPICAL PERFORMANCE CURVES
GAIN AND PHASE RESPONSE
The gain and phase response curves are for the MSK typical application circuit and are representative of typical device
performance, but are for reference only. The performance should be analyzed for each application to insure individual
program requirements are met. External factors such as temperature, input and output voltages, capacitors, etc. all
can be major contributors. Please consult factory for additional details.
Rev. K 12/09
6
MECHANICAL SPECIFICATIONS
WEIGHT= 7.7 GRAMS TYPICAL
ALL DIMENSIONS ARE ± 0.010 INCHES UNLESS OTHERWISE LABELED.
ESD Triangle indicates pin 1.
ORDERING INFORMATION
MSK5921 K RH U
LEAD CONFIGURATIONS
S= STRAIGHT; U= BENT UP; D= BENT DOWN
RADIATION HARDENED
SCREENING
BLANK= INDUSTRIAL; E= EXTENDED RELIABILITY
H= MIL-PRF-38534 CLASS H; K= MIL-PRF-38534 CLASS K
GENERAL PART NUMBER
The above example is an adjustable Class K regulator with leads bent up.
NOTE: See DSCC SMD 5962R05220 for DSCC part number options.
M.S. Kennedy Corp.
4707 Dey Road, Liverpool, New York 13088
Phone (315) 701-6751
FAX (315) 701-6752
www.mskennedy.com
The information contained herein is believed to be accurate at the time of printing. MSK reserves the right to make
changes to its products or specifications without notice, however, and assumes no liability for the use of its products.
Please visit our website for the most recent revision of this datasheet.
7
Rev. K 12/09
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