UM185XX
UM185XX
300mA, Micropower, VLDO Linear Regulator
UM185XX SOT23-5
General Description
The UM185XX series are VLDO (very low dropout) linear regulators designed for low power
portable applications. Typical output noise is only 75μVRMS and maximum dropout is just 90mV
at the load current of 150mA.The internal P-channel MOSFET pass transistor requires no base
current, allowing the device to draw only 100μA during normal operation at the maximum load
current of 300mA.
Other features include high output voltage accuracy, excellent transient response, under voltage
lockout, stability with ultra low ESR ceramic capacitors as small as 1μF, reverse-battery and
reverse-current protection, short-circuit and thermal overload protection and output current
limiting.
The UM185XX series are available in a low profile SOT23-5 package.
Applications
Features
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Bluetooth/802.11 Cards
PDAs and Notebook Computers
Portable Instruments and
Battery-Powered Systems
Cellular Phones
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Pin Configurations
Very Low Dropout: 90mV(max) at 150mA
Maximum Input Voltage: 6.0V
Low Noise:75μVRMS (10Hz to 100kHz)
±2%Voltage Accuracy at 150mA
Fast Transient Response
Under Voltage Lockout
Fixed Output Voltage:
3.3V/3.0V/2.8V/2.5V/1.8V/1.5V/1.3V/1.2V
Output Current Limit
Reverse-Battery and Reverse-Current
Protection
No Protection Diodes Needed
Stable with 1μF Output Capacitor
Short-Circuit and Thermal Overload
Protection
Low Profile SOT23-5 Package
Top View
UM185XX
M: Monthly Code
SOT23-5
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UM185XX
Ordering Information
Output Voltage
3.3V
3.0V
2.8V
2.5V
1.8V
1.5V
1.3V
1.2V
Part Number
UM18533
UM18530
UM18528
UM18525
UM18518
UM18515
UM18513
UM18512
Packaging Type
SOT23-5
Marking Code
5AU
5AR
5AQ
5AN
5AK
5AJ
5AD
5AC
Shipping Qty
3000pcs/7Inch
Tape & Reel
Pin Description
Pin Number
Symbol
1
IN
2
GND
3
___________
4
NC
5
OUT
SHDN
Function
Power Supply
Ground
Shutdown Input, Active Low
Not Connected
Voltage Regulated Output
Absolute Maximum Ratings (Note 1)
Symbol
VIN
Parameter
Supply Voltage on IN Pin
___________
Value
Unit
-7.5 to +7.5
V
VSHDN
Voltage on SHDN Pin
-0.3 to +7.5
V
VOUT
Voltage on OUT Pin
-0.3 to +7.5
V
___________
Output Short-Circuit Duration
TJ
TSTG
TL
Indefinite
Operating Junction Temperature (Notes 2, 3)
-40 to +125
°C
Storage Temperature Range
-65 to +150
°C
+300
°C
Lead Temperature for Soldering 10 seconds
Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be
impaired.
Note 2: The UM185XX is tested and specified under pulse load conditions such that TJ≈TA. The
device is guaranteed to meet performance specifications from 0 ℃ to 70 ℃ .
Specifications over the – 40℃ to 125℃ operating junction temperature range are
assured by design, characterization and correlation with statistical process controls.
Note 3: This IC includes overtemperature protection that is intended to protect the device during
momentary overload conditions. Junction temperature will exceed 125 ℃ when
overtemperature protection is active. Continuous operation above the specified maximum
operating junction temperature may impair device reliability.
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UM185XX
Electrical Characteristics
Symbol
Parameter
VIN
Input Voltage Range
VUVLO1
Input Under Voltage
Lockout
Input Under Voltage
Lockout
(Note1)
VUVLO2
(Note2)
IQ
___________
ISHDN
IOUT
Operating Quiescent
Current
Shutdown Leakage
Current
ESD Rating
ΔVDO
Dropout Voltage
ILIMT
Output Current Limit
Input Reverse
Leakage Current
(OUT to IN Leakage
Current)
Startup Time
Response
Min
VOUT+
VDROP
Typ
Max
Unit
6.0
V
VIN falling
2.0
2.6
V
VIN falling
2.1
2.3
V
IOUT=0mA
90
IOUT=300mA
100
μA
1
Human Body Mode
Output Current
Output Voltage
Accuracy
t
Test Conditions
1mA≤IOUT≤150mA,
TA=+25℃
1mA≤IOUT≤150mA,
TA=-40℃ to +85℃
1mA≤IOUT≤300mA,
TA=-40℃ to +85℃
IOUT=150mA
VIN≥2.5V
μA
2
KV
300
mA
-1
+1
-2
+2
-2.5
+2.5
90
450
%
mV
mA
VIN=4V, VOUT=5.5V
chip active
0.01
RL=68Ω, COUT=1μF
20
1.5
μA
μs
___________
VIL
SHDN Input Low
Voltage
0.3×VIN
V
___________
VIH
SHDN Input High
Voltage
___________
TSHDN
ΔTSHDN
SHDN Input Current
Thermal-Shutdown
Temperature
Thermal-Shutdown
Hysteresis
Line Regulation
Load Regulation
Output Voltage Noise
PSRR
Power Supply Ripple
Rejection
V
0.7×VIN
___________
SHDN=VIN or GND
-1
VOUT+1V≤VIN≤VOUT+2V
IOUT=10mA
VIN=VOUT+1V
1mA≤IOUT≤150mA
10Hz to 100KHz
CIN=0.1μF, IOUT=10mA
F=100Hz
70
F=1KHz
65
F=10KHz
50
F=100KHz
40
VIN=VOUT+1V
IOUT=100mA
0.1
+1
μA
160
℃
20
℃
0.09
%/V
0.2
%
75
μVR
MS
dB
Note1: VUVLO1 is measured for devices with VOUT≥1.8V.
Note2: VUVLO2 is measured for devices with VOUT≤1.5V.
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UM185XX
Pin Function
IN (Pin 1): Power for UM185XX and Load. Power is supplied to the devices through the IN pin.
The IN pin should be locally bypassed to ground if the UM185XX series are more than a few
inches away from another source of bulk capacitance. In general, the output impedance of a
battery rises with frequency, so it is usually advisable to include an input bypass capacitor in
battery-powered circuits. A capacitor in the range of 0.1μF to 1μF is usually sufficient. The
UM185XX series are designed to withstand reverse voltages on the IN pin with respect to both
ground and the output pin. In the case of a reversed input, which can happen if a battery is
plugged in backwards, the UM185XX will act as if there is a large resistor in series with its input
with only a small amount of current flow.
GND (Pin 2): Ground and Heat Sink. Solder to a ground plane or large pad to maximize heat
dissipation.
___________
SHDN (Pin 3): Shutdown, Active Low. This pin is used to put the UM185XX into shutdown. The
___________
SHDN pin cannot be left floating and must be tied to the input pin if not used.
NC (Pin 4): Not Connected.
OUT (Pin 5): Voltage Regulated Output. The OUT pin supplies power to the load. A minimum
output capacitor of 1μF is required to ensure stability. Larger output capacitors may be required
for applications with large transient loads to limit peak voltage transients. See the Applications
Information section for more information on output capacitance.
Typical Application Circuit
VIN
3.4V to 6.0V
IN
1uF
1uF
OFF ON
VOUT
3.3V
OUT
SHDN
GND
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UM185XX
Applications Information
The UM185XX series are 300mA very low dropout regulators with micropower quiescent current
and shutdown. The maximum dropout is only 90mV at the load current of 150mA. Output voltage
noise is as low as 75μVRMS over a 10Hz to 100kHz bandwidth.
In addition to the low quiescent current, the UM185XX regulators incorporate several protection
features which make them ideal for use in battery-powered systems. The devices are protected
against both reverse input voltages and reverse voltages from output to input (reverse current
protection). The devices also include current limit and thermal overload protection, and will
survive an output short circuit indefinitely. The fast transient response over comes the traditional
tradeoff between dropout voltage, quiescent current and load transient response inherent in most
regulators by using a proprietary new architecture
Output Capacitance and Transient Response
The UM185XX regulators are designed to be stable with a wide range of output capacitors. The
ESR of the output capacitor affects stability, most notably with small capacitors. A minimum
output capacitor of 1μF with an ESR of 0.3Ω or less is recommended to ensure stability. The
UM185XX series are micropower devices and output transient response will be a function of
output capacitance. Larger values of output capacitance decrease the peak deviations and provide
improved transient response for larger load current changes. The shaded region of Figure 1 defines
the region over which the UM185XX regulators are stable. The maximum ESR allowed is 0.3Ω.
High ESR tantalum and electrolytic capacitors may be used, but a low ESR ceramic capacitor
must be in parallel at the output. There is no minimum ESR requirement.
Figure 1
Extra consideration must be given to the use of ceramic capacitors. Ceramic capacitors are
manufactured with a variety of dielectrics, each with different behavior across temperature and
applied voltage. The most common dielectrics used are Z5U, Y5V, X5R and X7R. The Z5U and
Y5V dielectrics are good for providing high capacitances in a small package, but exhibit strong
voltage and temperature coefficients as shown in Figures 2 and 3. When used with a 5V regulator,
a 10μF Y5V capacitor can exhibit an effective value as low as 1μF to 2μF over the operating
temperature range. The X5R and X7R dielectrics result in more stable characteristics and are more
suitable for use as the output capacitor. The X7R type has better stability across temperature,
while the X5R is less expensive and is available in higher values.
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UM185XX
Figure 2
Figure 3
Additionally, some ceramic capacitors have a piezoelectric response. A piezoelectric device
generates voltage across its terminals due to mechanical stress, similar to the way a piezoelectric
accelerometer or microphone works. For a ceramic capacitor the stress can be induced by
vibrations in the system or thermal transients. The resulting voltages produced can cause
appreciable amounts of noise, especially when a ceramic capacitor is used for noise bypassing.
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UM185XX
Package Information
UM185XX: SOT23-5
Outline Drawing
Symbol
A
A1
A2
b
c
D
E
E1
e
e1
L
θ
DIMENSIONS
MILLIMETERS
Min
Max
1.050
1.250
0.000
0.100
1.050
1.150
0.300
0.500
0.100
0.200
2.820
3.020
1.500
1.700
2.650
2.950
0.950REF
1.800
2.000
0.300
0.600
0°
8°
INCHES
Min
Max
0.041 0.049
0.000 0.004
0.041 0.045
0.012 0.020
0.004 0.008
0.111 0.119
0.059 0.067
0.104 0.116
0.037REF
0.071 0.079
0.012 0.024
0°
8°
Land Pattern
NOTES:
1. Compound dimension: 2.92×1.60;
2. Unit: mm;
3. General tolerance ±0.05mm unless otherwise
specified;
4. The layout is just for reference.
Tape and Reel Orientation
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UM185XX
IMPORTANT NOTICE
The information in this document has been carefully reviewed and is believed to be
accurate. Nonetheless, this document is subject to change without notice. Union assumes
no responsibility for any inaccuracies that may be contained in this document, and makes
no commitment to update or to keep current the contained information, or to notify a
person or organization of any update. Union reserves the right to make changes, at any
time, in order to improve reliability, function or design and to attempt to supply the best
product possible.
Union Semiconductor, Inc
Add: 7F, No. 5, Bibo Road, Shanghai 201203
Tel: 021-51097928
Fax: 021-51026018
Website: www.union-ic.com
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