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FIXED 2.5 AND 5 VOLT
MINIATURE VOLTAGE REGULATORS
ISSUE 4 - MARCH 2002
ZMR SERIES
DEVICE DESCRIPTION
The ZMR series of three terminal fixed
positive voltage regulators feature internal
current limit and will shut down under
thermal overload conditions making the
devices difficult to destroy.
The circuit design offers an exceptionally
low quiescent current, only 30µA for the 2.5
volt device, ideal for low power applications.
The initial devices in the series regulate to
2.5 or 5 volts with a drive capability up to
50mA, however, the flexible design will
allow other voltage selections to be made.
The device is designed with space saving in
mind and is available in the small outline
SOT23 package. The device is also available
in through hole TO92 package.
FEATURES
Small outline SOT23 package
TO92 package
2.5V and 5V output
22.5V maximum input voltage
(ZMR25H)
25V maximum input voltage (ZMR50H)
Output current up to 50mA
Very low Quiesent current (30µA)
Unconditionally stable
Other output voltages possible
Internal short circuit current limit
VOLTAGE RANGE
ZMR250 2.5V
ZMR500 5.0V
ZMR25H 2.5V
ZMR50H 5.0V
SCHEMATIC DIAGRAM
Vin
Vout
4-104
Gnd

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ZMR SERIES
ABSOLUTE MAXIMUM RATINGS
Input voltage (ZMR25H) 22.5V
(ZMR50H) 25V
ZMR250
ZMR500
20V
20V
Package power dissipation
(Tamb=25 °C)
SOT23 500mW (Note 3)
TO92 600mW
Output current (IO)
100mA
Operating temperature
Storage temperature
Note:
-55 to 125°C
-65 to 150°C
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 =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. Maximum power dissipation for the SOT23 package, is calculated assuming that the device is
mounted on a ceramic substrate measuring 15 x 15 x 0.6mm.
ZMR25H
ELECTRICAL CHARACTERISTICS
TEST CONDITIONS (Unless otherwise stated):Tj=25°C, IO=10mA, Vin=6.5V
SYMBOL PARAMETER
CONDITIONS MIN. TYP. MAX. UNITS
VO Output Voltage
2.438 2.5
IO=0 to 50mA 2.360
Tj=-55 to 125°C
Vin=4.5 to 22.5V
IO=0 to 50mA
Tj=-55 to 125°C
2.360
VO Line Regulation
Vin=4.5 to 22.5V
5
VO Load Regulation
IO=0 to 50mA
IO=0 to 10mA
20
12
ls Supply Current
Tj=-55 to 125°C
30
ls Supply Current Change IO=0 to 50mA
Vin=4.5 to 22.5V
1
2
2.563
2.640
V
V
2.640 V
15 mV
30 mV
mV
40 µA
±10 µA
10 µA
Vn Output Noise Voltage
Vin /VO Ripple Rejection
f=10Hz to 10KHz
Vin=6.3 to 18V
f=120Hz
55
65
75
µV rms
dB
Vin Input Voltage Required
To Maintain Regulation
4.2 3.9
V
VO /T Average Temperature
Coefficient of VO
IO=5.0mA
Tj=-55 to 125°C
0.275 0.700 mV/°C
4-105

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ZMR SERIES
ZMR50H
ELECTRICAL CHARACTERISTICS
TEST CONDITIONS (Unless otherwise stated):Tj=25°C, IO=10mA, Vin=10V
SYMBOL PARAMETER
CONDITIONS MIN. TYP. MAX. UNITS
VO Output Voltage
4.875 5
5.125 V
IO=0 to 50mA 4.780
Tj=-55 to 125°C
5.160 V
Vin=7 to 25V
IO=0 to 50mA
Tj=-55 to 125°C
4.780
VO Line Regulation
Vin=7 to 25V
5
VO Load Regulation
IO=0 to 50mA
IO=0 to 10mA
25
15
ls Supply Current
Tj=-55 to 125°C
50
ls Supply Current Change IO=0 to 50mA
Vin=7 to 25V
1
2
5.175 V
15 mV
40 mV
mV
70 µA
±10 µA
10 µA
Vn Output Noise Voltage
Vin /VO Ripple Rejection
f=10Hz to 10KHz
Vin=8 to 18V
f=120Hz
55
90
72
µV rms
dB
Vin Input Voltage Required
To Maintain Regulation
7 6.7
V
VO /T Average Temperature
Coefficient of VO
IO=5.0mA
Tj=-55 to 125°C
0.275 0.700 mV/°C
4-106

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ZMR SERIES
ZMR250
ELECTRICAL CHARACTERISTICS
TEST CONDITIONS (Unless otherwise stated):Tj=25°C, IO=10mA, Vin=6.5V
SYMBOL PARAMETER
CONDITIONS MIN. TYP. MAX. UNITS
VO Output Voltage
IO=0 to 50mA
Tj=-55 to 125°C
2.438
2.360
2.5
2.563
2.640
V
V
Vin=4.5 to 20V
IO=0 to 50mA
Tj=-55 to 125°C
2.360
VO Line Regulation
Vin=4.5 to 20V
5
VO Load Regulation
IO=0 to 50mA
IO=0 to 10mA
20
12
ls Supply Current
Tj=-55 to 125°C
30
ls Supply Current Change IO=0 to 50mA
Vin=4.5 to 20V
1
2
2.640 V
15 mV
30 mV
mV
40 µA
±10 µA
10 µA
Vn Output Noise Voltage
Vin /VO Ripple Rejection
f=10Hz to 10KHz
Vin=6.3 to 18V
f=120Hz
55
65
75
µV rms
dB
Vin Input Voltage Required
To Maintain Regulation
4.2 3.9
V
VO /T Average Temperature
Coefficient of VO
IO=5.0mA
Tj=-55 to 125°C
0.275 0.700 mV/°C
4-107

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ZMR SERIES
ZMR500
ELECTRICAL CHARACTERISTICS
TEST CONDITIONS (Unless otherwise stated):Tj=25°C, IO=10mA, Vin=10V
SYMBOL PARAMETER
CONDITIONS MIN. TYP. MAX. UNITS
VO Output Voltage
4.875 5
5.125 V
IO=0 to 50mA 4.780
Tj=-55 to 125°C
5.160 V
Vin=7 to 20V
IO=0 to 50mA
Tj=-55 to 125°C
4.780
VO Line Regulation
Vin=7 to 20V
5
VO Load Regulation
IO=0 to 50mA
IO=0 to 10mA
25
15
ls Supply Current
Tj=-55 to 125°C
50
ls Supply Current Change IO=0 to 50mA
Vin=7 to 20V
1
2
5.175 V
15 mV
40 mV
mV
70 µA
±10 µA
10 µA
Vn Output Noise Voltage
Vin /VO Ripple Rejection
f=10Hz to 10KHz
Vin=8 to 18V
f=120Hz
55
90
72
µV rms
dB
Vin Input Voltage Required
To Maintain Regulation
7 6.7
V
VO /T Average Temperature
Coefficient of VO
IO=5.0mA
Tj=-55 to 125°C
0.275 0.700 mV/°C
4-108