UM175XX
300mA, Micropower, VLDO Linear Regulator
UM175XX
SOT23-5
General Description
The UM175XX series are VLDO (very low dropout) linear regulators designed for low power
portable applications. Typical output noise is only 75μV
RMS
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 ultralow ESR ceramic capacitors as small as 1μF, reverse-battery protection,
short-circuit and thermal overload protection and output current limiting.
The UM175XX series are available in a low profile SOT23-5 package.
Applications
Bluetooth/802.11 Cards
PDAs and Notebook Computers
Portable Instruments and
Battery-Powered Systems
Cellular Phones
Features
Very Low Dropout: 90mV(max) at 150mA
Maximum Input Voltage: 6.0V
Low Noise:75μV
RMS
(10Hz to 100kHz)
±2%Voltage Accuracy at 150mA
Fast Transient Response
Under Voltage Lockout
Fixed Output Voltage:
3.3V/3.0V/2.8V/2.7V/2.5V/1.8V/1.5V/1.3V/
1.2V
Output Current Limit
Reverse-Battery Protection
No Protection Diodes Needed
Stable with 1μF Output Capacitor
Short-Circuit and Thermal Overload
Protection
Low Profile SOT23-5 Package
Pin Configurations
Top View
UM175XX
M: Monthly Code
SOT23-5
________________________________________________________________________
http://www.union-ic.com Rev.04 Feb.2012
1/7
UM175XX
Ordering Information
Part Number
UM175415
UM17535
UM17533
UM17530
UM17528
UM17527
UM17525
UM17518
UM17515
UM17513
UM17512
Output Voltage
4.15V
3.5V
3.3V
3.0V
2.8V
2.7V
2.5V
1.8V
1.5V
1.3V
1.2V
Packaging Type
Marking Code
5CY
5CZ
5CU
5CR
5CQ
5CP
5CN
5CK
5CJ
5CF
5CE
Shipping Qty
SOT23-5
3000pcs/7Inch
Tape & Reel
Pin Description
Pin Number
1
2
3
4
5
Symbol
IN
GND
___________
Function
Power Supply
Ground
Shutdown Input, Active Low
Not Connected
Voltage Regulated Output
SHDN
NC
OUT
Absolute Maximum Ratings (Note 1)
Symbol
V
IN
V
SHDN
V
OUT
T
J
T
STG
T
L
___________
Parameter
Supply Voltage on IN Pin
Voltage on SHDN Pin
Voltage on OUT Pin
Output Short-Circuit Duration
Operating Junction Temperature (Notes 2, 3)
Storage Temperature Range
Lead Temperature for Soldering 10 seconds
___________
Value
-7.5 to +7.5
-0.3 to +7.5
-0.3 to +7.5
Indefinite
-40 to +125
-65 to +150
+300
Unit
V
V
V
°C
°C
°C
Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be
impaired.
Note 2: The UM175XX is tested and specified under pulse load conditions such that T
J
≈T
A
. 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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UM175XX
Electrical Characteristics
Symbol
V
IN
V
UVLO1
（Note1）
Parameter
Input Voltage Range
Input Under Voltage
Lockout
Input Under Voltage
Lockout
Operating Quiescent
Current
Shutdown Leakage
Current
ESD Rating
Output Current
Test Conditions
Min
V
OUT
+
V
DROP
2.0
2.1
Typ
Max
6.0
2.6
2.3
Unit
V
V
V
μA
V
IN
falling
V
IN
falling
I
OUT
=0mA
I
OUT
=300mA
V
UVLO2
（Note2）
I
Q
I
SHDN
I
OUT
___________
90
100
1
μA
KV
mA
Human Body Mode
1mA≤I
OU
T
≤150mA,
T
A
=+25℃
1mA≤I
OUT
≤150mA,
T
A
=-40℃ to +85℃
1mA≤I
OUT
≤300mA,
T
A
=-40℃ to +85℃
I
OUT
=150mA
V
I
N
≥2.5V
R
L
=68Ω, C
OUT
=1μF
2
300
-1
-2
-2.5
+1
+2
+2.5
90
450
20
0.3×V
IN
0.7×V
IN
%
Output Voltage
Accuracy
ΔV
DO
I
LIMT
t
V
IL
V
IH
Dropout Voltage
Output Current Limit
Startup Time
Response
___________
mV
mA
μs
V
V
SHDN Input Low
Voltage
___________
SHDN Input High
Voltage
___________
___________
T
SHDN
ΔT
SHDN
SHDN Input Current
Thermal-Shutdown
Temperature
Thermal-Shutdown
Hysteresis
Line Regulation
Load Regulation
SHDN=V
IN
or GND
-1
0.1
160
20
+1
μA
℃
℃
%/V
%
μV
RMS
dB
Output Voltage Noise
V
OUT
+1V≤V
IN
≤V
OUT
+2V
I
OUT
=10mA
V
IN
=V
OUT
+1V
1mA≤I
OUT
≤150mA
10Hz to 100KHz
C
IN
=0.1μF, I
OUT
=10mA
F=100Hz
V
IN
=V
OUT
+1V
I
OUT
=100mA
F=1KHz
F=10KHz
F=100KHz
0.09
0.2
75
70
65
50
40
PSRR
Power Supply Ripple
Rejection
Note1:
V
UVLO1
is measured for devices with V
OUT
≥1.8V.
Note2:
V
UVLO2
is measured for devices with V
OUT
≤1.5V.
Note3:
ΔV
DO
just define for device with V
OUT
≥2.5V.
________________________________________________________________________
http://www.union-ic.com Rev.04 Feb.2012
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UM175XX
Pin Function
IN (Pin 1):
Power for UM175XX and Load. Power is supplied to the devices through the IN pin.
The IN pin should be locally bypassed to ground if the UM175XX 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
UM175XX 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 UM175XX 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 UM175XX 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
1uF
SHDN
GND
IN
OUT
1uF
VOUT
3.3V
OFF ON
________________________________________________________________________
http://www.union-ic.com Rev.04 Feb.2012
4/7
UM175XX
Typical Performance Characteristics
Quiescent Current vs Input Voltage
140
120
Quiescent Current(uA)
Dropout Voltage(V)
3.34
3.33
3.32
Outpout Voltage vs Output Current
100
80
60
40
20
0
2.5
3
3.5
4
4.5
5
5.5
6
Input Voltage(V)
3.31
3.30
3.29
3.28
3.27
3.26
3.25
0
1
50
100
150
200
250
300
Output Current(mA)
Dropout Voltage vs Output Current
120
100
Dropout Voltage(mV)
80
60
40
20
0
0
25
50
75 100 125 150 175 200 225 250 275 300
Output Current(mA)
Outpout Voltage vs Output Current
3.34
3.33
3.32
Dropout Voltage(V)
3.31
3.30
3.29
3.28
3.27
3.26
3.25
0
1
50
100
150
200
250
300
Output Current(mA)
Line Transient Response
Load Transient Response
V
IN
=3.5V to 4.5V (2.0V/div)
I
OUT
=30mA to 200mA (200mA/div)
V
OUT
(100mV/div)
UM17533S
I
LOAD
=100mA,100us/div
V
OUT
(20mV/div)
UM17533S
VIN=4.3V,100us/div
________________________________________________________________________
http://www.union-ic.com Rev.04 Feb.2012
5/7
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