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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 350A. 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 125C temperature range No external components Internal thermal shutdown Internal short circuit current limit
APPLICATIONS
Satellite receivers Low noise blocks
Vin
SCHEMATIC DIAGRAM
Q14 Q18 Q19 Q13 Q10 Q8 Q4 Q12 R6 Q20 Q11 R7 R3 Q21 Q5 Q6 Q7 Q16 Q17 R14 Q9
Vout
R4
R5 Q1 R1 Q3
C1
R9
R13 R2
Gnd
4-299
ZSAT500
ABSOLUTE MAXIMUM RATING
Input voltage Output Current(Io) Operating Temperature Storage Temperature 20V 200mA -55 to 125C -65 to 150C Power Dissipation (Tamb=25C) SOT223 3W(Note 3) TO92 600mW SO8 780mW(Note 3)
ELECTRICAL CHARACTERISTICS TEST CONDITIONS (Unless otherwise stated):Tj=25C, IO=100mA, Vin=9V
SYMBOL PARAMETER
VO
CONDITIONS
MIN. 4.875
TYP. 5
MAX. 5.125 5.2
UNITS V V
Output Voltage IO=1 to 200mA Tj=-55 to 125C Vin=7 to 20V IO=1 to 100mA Tj=-55 to 125C
4.8
4.8
5.2
V
VO VO lq lq
Line Regulation Load Regulation
Vin=7 to 20V IO=1 to 200mA IO=1 to 100mA Tj=-55 to 125C
10 5 2 350
40 25
mV mV mV A A A V rms dB
Quiescent Current
600 50 100
Quiescent Current Change IO=1 to 200mA Vin=7 to 20V Output Noise Voltage f=10Hz to 10KHz Vin=8 to 18V f=120Hz-22KHz Vin=8 to 18V f=200KHz 75
Vn
Vin /VO Ripple Rejection Vin /VO Ripple Rejection
65
40
dB
Vin VO/T
Input Voltage Required To Maintain Regulation Average Temperature Coefficient of VO IO=5.0mA Tj=-55 to 125C
7
6.7
V
0.1 2
mV/C V
VGI
Reverse Supply IGI=500mA Protection Diode Forward Voltage
4-300
ZSAT500
TYPICAL CHARACTERISTICS
5.03 450 5.02
Quiescent Current (A)
IO = 5mA VIN = 9V
IO = 0 VIN =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
IO=100mA COUT = 0 dVin/dt = 5V/s
0 10 20 30 40 50
-0.5
VIN= 9V COUT = 0 dIo/dt = 1A/s
0 10 20 30 40 50
Time (s)
Time (s)
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
VO = 0 VIN = 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 () 1.0
Io = 100mA VIN = 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 Tamb=125C. 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 (1F 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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