5 VOLT ENHANCED POSITIVE
LOCAL VOLTAGE REGULATOR
ISSUE 1 - DECEMBER 1995
DEVICE DESCRIPTION
The ZSAT500 is an enhanced three terminal
fixed positive 5 volt regulator. The device is
designed particularly for use in Satellite
receiver low noise blocks where a high
degree of supply rejection is required to
extended frequencies. The device has been
improved to give superior performance with
ripple rejection of 65dB up to 22KHz , and
40dB up to 200KHz.
The device features internal circuit current
limit and thermal shutdown making it almost
impossible to destroy. The ZSAT500 shows
performance characteristics superior to
other local voltage regulators. The initial
output voltage is maintained to within 2.5%
with a quiescent current of typically 350µA.
Line and load regulation is superior to that
of other devices, with load current up to a
maximum 200mA.
For the LNB application the regulator is
offered in a surface mount SOT223 package
which permits power dissipation up to 3
watts. Additionally the device can be made
available in an SO8 surface mount package,
as well as TO92 for through hole application.
ZSAT500
The devices are suited to local voltage
regulation applications, where problems
could be encountered with distributed single
source regulation, as well as more general
voltage regulation applications.
FEATURES
•
•
•
•
•
•
•
•
•
•
•
•
•
Q25
Enhanced ripple rejection - 65dB at
22kHz
Small outline SO8 and SOT223
packages
TO92 package
5 volt output
Output current upto 200mA
Tight initial tolerance
Low quiescent current
-55 to 125°C temperature range
No external components
Internal thermal shutdown
Internal short circuit current limit
APPLICATIONS
Satellite receivers
Low noise blocks
V
in
SCHEMATIC DIAGRAM
Q14
Q18
Q19
Q13
Q10
Q8
Q4
Q12
R6
Q20
Q11
R7
R3
Q21
Q5
Q6
Q7
Q16
Q17
R14
Q9
V
out
R4
R5
Q1
R1
Q3
C1
R9
R13
R2
Gnd
4-299
ZSAT500
ABSOLUTE MAXIMUM RATING
Input voltage
Output Current(I
o
)
Operating Temperature
Storage Temperature
20V
200mA
-55 to 125°C
-65 to 150°C
Power Dissipation (T
amb
=25°C)
SOT223
3W(Note 3)
TO92
600mW
SO8
780mW(Note 3)
ELECTRICAL CHARACTERISTICS
TEST CONDITIONS (Unless otherwise stated):T
j
=25°C, I
O
=100mA, V
in
=9V
SYMBOL PARAMETER
V
O
CONDITIONS
MIN.
4.875
TYP.
5
MAX.
5.125
5.2
UNITS
V
V
Output Voltage
I
O
=1 to 200mA
T
j
=-55 to 125°C
V
in
=7 to 20V
I
O
=1 to 100mA
T
j
=-55 to 125°C
4.8
4.8
5.2
V
∆V
O
∆V
O
l
q
∆l
q
Line Regulation
Load Regulation
V
in
=7 to 20V
I
O
=1 to 200mA
I
O
=1 to 100mA
T
j
=-55 to 125°C
10
5
2
350
40
25
mV
mV
mV
µA
µA
µA
µV
rms
dB
Quiescent Current
600
50
100
Quiescent Current Change I
O
=1 to 200mA
V
in
=7 to 20V
Output Noise Voltage
f=10Hz to 10KHz
V
in
=8 to 18V
f=120Hz-22KHz
V
in
=8 to 18V
f=200KHz
75
V
n
∆V
in
/∆V
O
Ripple Rejection
∆V
in
/∆V
O
Ripple Rejection
65
40
dB
V
in
∆V
O
/∆T
Input Voltage Required
To Maintain Regulation
Average Temperature
Coefficient of V
O
I
O
=5.0mA
T
j
=-55 to 125°C
7
6.7
V
0.1
2
mV/°C
V
V
GI
Reverse Supply
I
GI
=500mA
Protection Diode Forward
Voltage
4-300
ZSAT500
TYPICAL CHARACTERISTICS
5.03
450
5.02
Quiescent Current (µA)
I
O
= 5mA
V
IN
= 9V
I
O
= 0
V
IN
=9V
400
Output Voltage (V)
5.01
5.00
4.99
4.98
4.97
4.96
350
300
250
-50
-25
0
25
50
75
100
125
-50
-25
0
25
50
75
100
125
Temperature (°C)
Temperature (°C)
Output Voltage Temperature Coefficient
Quiescent Current v Temperature
Output Voltage Deviation (V)
Output Voltage Deviation (V)
INPUT VOLTAGE
14V
LOAD CURRENT
100 mA
9V
0
+0.5
OUTPUT VOLTAGE
DEVIATION
+0.5
OUTPUT VOLTAGE
DEVIATION
0
0
-0.5
I
O
=100mA
C
OUT
= 0
dV
in
/dt = 5V/µs
0
10
20
30
40
50
-0.5
V
IN
= 9V
C
OUT
= 0
dI
o
/dt = 1A/µs
0
10
20
30
40
50
Time (µs)
Time (µs)
Line Transient Response
Short-Circuit Output Current (mA)
500
2.5
Load Transient Response
300
Drop-Out Voltage (V)
400
2.0
Io=200mA
1.5
Io=100mA
1.0
200
100
V
O
= 0
V
IN
= 10V
0.5
0
-50
-25
0
25
50
75
100
125
0
-50
-25
0
25
50
75
100
125
Temperature (°C)
Temperature (°C)
Peak Output Current v Temperature
Drop-Out Voltage v Temperature
4-301
ZSAT500
TYPICAL CHARACTERISTICS
80
70
60
Ripple Rejection (dB)
50
40
30
20
10
0
100
1k
10k
100k
1M
Ripple Frequency (Hz)
0.01
100
1K
Frequency (Hz)
10K
100K
Output Impedance (Ω)
1.0
I
o
= 100mA
V
IN
= 9V
0.1
Ripple Rejection vs. Ripple Frequency
Output Impedance vs. Frequency
Notes:
1.
The maximum operating input voltage and
output current of the device will be governed by
the maximum power dissipation of the selected
package. Maximum package power dissipation is
specified at 25 °C and must be linearly derated to
zero at T
amb
=125°C.
2.
The given data represents pulse test conditions
with junction temperatures as indicated at the
initiation of the test. Continuous operation of the
devices with the stated conditions might exceed
the power dissipation limits of the chosen
package.
3.
Maximum power dissipation, for the SO8 and
SOT223 packages, is calculated assuming that the
device is mounted on a PCB measuring 2 inches
square.
4.
The shut down feature of the device operates if
its temperature exceeds its design limit as might
occur during external faults, short circuits etc. If the
regulator is supplied from an inductive source, a
large voltage transient, on the regulator input, can
result should the shut down circuit operate. It is
advised that a capacitor (1µF or greater) should be
applied across the regulator input to ensure that
the maximum voltage rating of the device is not
exceeded under shutdown conditions.
5. HF Stability
The ZSAT500 is guaranteed stable without an
input or output capacitor. However if an output
capacitor is used then this should be a total value
of at least 100nF and should be accompanied by
an input capacitor of 200nF or greater, wired in
close proximity to the regulator if stability is to be
ensured.
4-302
ZSAT500
APPLICATIONS
Fixed Output Regulator
Adjustable Output Regulator
Input
ZSR***
Output
Input
ZSR***
Output
Iq
Gnd
Vo= Vreg + (Vreg/R1 + Iq)R2
R1
R2
Current Regulator
Gnd
Input
ZSR***
R1
Output
Io= (Vreg/R1) + Iq
Iq
4-303
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