FIXED 2.5 AND 5 VOLT
3-TERMINAL VOLTAGE REFERENCES
ISSUE 4 - MARCH 1998
DEVICE DESCRIPTION
The ZTR250 and ZTR500 are precision three
terminal references. These devices are ideal
for battery powered applications where
power saving is important. They offer low
power alternatives to other two terminal
shunt references.
The ZTR devices do not require an external
resistor and, in contrast to two terminal
references, waste none of the battery power
as load current varies. The ZTR only
consumes 30µA supply current.
The two devices require as low as 1.4 volts
between input and output for regulation.
Output voltage tolerance is
±
2.5%, with a
voltage variation of 0.275mV/°C over the
-55°C to 125°C operating range.
ZTR250
ZTR500
FEATURES
•
•
•
•
•
•
•
•
•
•
•
•
•
Small outline SOT23 and SOT89
packages
TO92 package
2.5V and 5V output
2.5% tolerance
Supply current independent of input
voltage over temperature
Output current up to 50mA
Very low supply current (30µA)
Unconditionally stable
Internal short circuit current limit
APPLICATIONS
Battery Powered Systems
Portable and Hand Held Equipment
Instrumentation
Metering
SCHEMATIC DIAGRAM
Vin
Vout
Gnd
4-388
ZTR250
ZTR500
ABSOLUTE MAXIMUM RATINGS
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, T
jmax
=150 °C)
SOT23
500mW
TO92
600mW
SOT89
1.5W
Note:
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 following 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. This device does not contain a thermal shutdown circuit so care should be taken not to exceed the stated
maximum power dissipation rating.Maximum power dissipation, for the SOT23 and SOT89 packages, is
calculated assuming that the device is mounted on a ceramic substrate measuring 15 x 15 x 0.6mm.
ZTR250
ELECTRICAL CHARACTERISTICS
TEST CONDITIONS (Unless otherwise stated):T
j
=25°C, I
O
=10mA, V
in
=6.5V
SYMBOL PARAMETER
V
O
CONDITIONS
I
O
=0 to 50mA
T
j
=-55 to 125°C
V
in
=4.5 to 20V
I
O
=0 to 50mA
T
j
=-55 to 125°C
MIN.
2.438
2.360
2.360
TYP.
2.5
MAX.
2.563
2.640
2.640
UNITS
V
V
V
Output Voltage
∆V
O
∆V
O
l
s
∆l
s
V
n
Line Regulation
Load Regulation
Supply Current
Supply Current Change
Output Noise Voltage
V
in
=4.5 to 20V
I
O
=0 to 50mA
I
O
=0 to 10mA
T
j
=-55 to 125°C
I
O
=0 to 50mA
V
in
=4.5 to 20V
f=10Hz to 10kHz
V
in
=6.3 to 18V
f=120Hz
5
20
12
30
1
2
65
15
30
40
±10
10
mV
mV
mV
µA
µA
µA
µV
(rms)
dB
V
∆V
in
/∆V
O
Ripple Rejection
V
in
∆V
O
/∆T
55
4.2
75
3.9
0.275
0.700
Input Voltage Required
To Maintain Regulation
Average Temperature
Coefficient of V
O
I
O
=5.0mA
T
j
=-55 to 125°C
mV/°C
4-389
ZTR250
ZTR500
ZTR500
ELECTRICAL CHARACTERISTICS
TEST CONDITIONS (Unless otherwise stated):T
j
=25°C, I
O
=10mA, V
in
=10V
SYMBOL PARAMETER
V
O
CONDITIONS
MIN.
4.875
TYP.
5
MAX.
5.125
5.160
5.175
UNITS
V
V
V
Output Voltage
I
O
=0 to 50mA
T
j
=-55 to 125°C
V
in
=7 to 20V
I
O
=0 to 50mA
T
j
=-55 to 125°C
4.780
4.780
∆V
O
∆V
O
l
s
∆l
s
V
n
Line Regulation
Load Regulation
Supply Current
Supply Current Change
Output Noise Voltage
V
in
=7 to 20V
I
O
=0 to 50mA
I
O
=0 to 10mA
T
j
=-55 to 125°C
I
O
=0 to 50mA
V
in
=7 to 20V
f=10Hz to 10kHz
V
in
=8 to 18V
f=120Hz
55
5
25
15
50
1
2
90
72
15
40
70
±10
10
mV
mV
mV
µA
µA
µA
µV
(rms)
dB
∆V
in
/∆V
O
Ripple Rejection
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
0.275
0.700
V
mV/°C
4-390
ZTR250
ZTR500
TYPICAL CHARACTERISTICS
a=ZTR250: b=ZTR500
5.02
5.00
b
I
o
=5mA
V
in
=V
o
+4
60
I
o
=10mA
b
Output Voltage
4.98
4.96
2.52
2.50
2.48
2.46
a
-50
-25
0
25
50
75 100 125
I
o
=5mA
V
in
=V
o
+4
Supply Current (µA)
50
40
30
a
20
10
0
2
4
6
8
10 12 14 16 18
20
Temperature (°C)
Input Voltage (V)
Output Voltage Temperature
60
34
I
o
=0
V
in
=V
o
+4
Supply Current v Voltage
Supply Current (µA)
32
Supply Current (µA)
56
I
o
=0
V
in
=V
o
+4
52
30
a
28
48
b
44
26
40
-50 -25
0
25
50
75 100 125
-50
-25
0
25
50
75 100 125
Temperature (°C)
Temperature (°C)
Supply Current v Temperature
50
Supply Current v Temperature
2.5
I
o
=10mA
Supply Current (µA)
49
48
47
b
Drop-Out Voltage (V)
I
o
=0
V
in
=V
o
+4
2.0
b
1.5
a
1.0
30
29
28
27
0.1
1
10
a
I
o
=0
V
in
=V
o
+4
100
0.5
0
-50 -25
0
25
50
75 100 125
Output Current
Temperature (°C)
Supply Current v Output Current
4-391
Drop-Out Voltage v Temperature
ZTR250
ZTR500
TYPICAL CHARACTERISTICS
10
90
I
O
= 10mA
I o= 2mA
V
IN
= V + 4V
OUT
a=ZTR250: b=ZTR500
Output Impedance (Ohms)
80
Io = 10mA
a
b
Ripple Rejection (dB)
70
60
50
40
30
20
10
1.0
a
0.1
b
0.01
100
1K
10K
100K
0
10
100
1K
10K
100K
Frequency (Hz)
Ripple Frequency (Hz)
Output Impedance v Frequency
Ripple Rejection v Ripple Frequency
Output Voltage Deviation (V)
Load Current
0mA
Output Voltage Deviation (V)
5mA
5V
Vin
0V
0.4
a
0.4
a
0
C
OUT
=0
V
IN
=V
o
+4
dI
o
/dt=1A/µs
b
0
C
OUT
=0
V
IN
=V
o
+4
dV
IN
/dt=5V/µs
b
-0.4
-0.4
0.4
0
0.4
0
-0.4
0
20
40
60
80
100
-0.4
0
10
20
30
40
50
Time (µs)
Time (µs)
Load Transient Response
2
800
Line Transient Response
Surface Mount Devices
Power Dissipation
(mW)
SOT89
TO92
Through Hole Device
Power Dissipation
(mW)
25
50
75 100 125
600
1
400
SOT23
200
0
-50
-25
0
Temperature (°C)
0
-50
-25
0
25
50
75 100 125
Temperature (°C)
Power Derating
Power Derating
4-392
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