UM177XX
500mA, Micropower, VLDO Linear Regulator
UM177XX
QFN2020-6
General Description
The UM177XX 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 400mV
at the load current of 500mA.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 500mA.
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,
short-circuit and thermal overload protection and output current limiting.
The UM177XX series are available in a low profile QFN2020-6 package.
Applications
Bluetooth/802.11 Cards
PDAs and Notebook Computers
Portable Instruments and
Battery-Powered Systems
Cellular Phones
Features
Very Low Dropout: 400mV(max) at 500mA
Maximum Input Voltage: 6.0V
Low Noise:75μV
RMS
(10Hz to 100kHz)
±2.5%Voltage Accuracy at 500mA
Fast Transient Response
Under Voltage Lockout
Fixed Output Voltage:
3.5V/3.3V/3.0V/2.8V/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 QFN2020-6 Package
Pin Configurations
Top View
UM177XX
M: Month Code
QFN2020-6
________________________________________________________________________
http://www.union-ic.com Rev.01 Sep.2010
1/7
UM177XX
Ordering Information
Part Number
UM17735
UM17733
UM17730
UM17728
UM17725
UM17718
UM17715
UM17713
UM17712
Output Voltage
3.5V
3.3V
3.0V
2.8V
2.5V
1.8V
1.5V
1.3V
1.2V
Packaging Type
Marking Code
AAZ
AAV
AAR
AAQ
AAN
AAK
AAJ
AAD
AAC
Shipping Qty
QFN2020-6
3000pcs/7Inch
Tape & Reel
Pin Description
Pin Number
1
2
3
4
5
6
Symbol
___________
Function
Shutdown Input, Active Low
Ground
Power Supply
Voltage Regulated Output
Not Connected
Not Connected
SHDN
GND
VIN
VOUT
NC
NC
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 UM177XX 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.
________________________________________________________________________
http://www.union-ic.com Rev.01 Sep.2010
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UM177XX
Electrical Characteristics
Over recommended operating free-air temperature range (unless otherwise noted)
Symbol
V
IN
V
UVLO
I
Q
I
SHDN
I
OUT
___________
Parameter
Input Voltage Range
Input Under Voltage
Lockout*
Operating Quiescent
Current
Shutdown Leakage
Current
ESD Rating
Output Current
Test Conditions
Min
V
OUT
+
V
DROP
2.0
Typ
Max
6.0
2.6
Unit
V
V
μA
V
IN
falling
V
IN
=5.0V,I
OUT
=0mA
V
IN
=5.0V,I
OUT
=500mA
90
100
1
μA
KV
mA
Human Body Mode
1mA≤I
OUT
≤150mA,
T
A
=+25℃
1mA≤I
OUT
≤150mA,
T
A
=-40℃ to +85℃
1mA≤I
OUT
≤500mA,
T
A
=-40℃ to +85℃
I
OUT
=500mA
V
IN
≥2.5V
V
IN
=4V, V
OUT
=5.5V
chip active
R
L
=68Ω, C
OUT
=1μF
2
500
-1
-2
-2.5
250
700
0.01
20
0.3×V
IN
0.7×V
IN
1.5
+1
+2
+2.5
400
Output Voltage
Accuracy
%
ΔV
DO
I
LIMT
Dropout Voltage
Output Current Limit
Input Reverse
Leakage Current
(OUT to IN Leakage
Current)
Startup Time
Response
___________
mV
mA
μA
μs
V
V
t
V
IL
V
IH
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
R
MS
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
0.09
0.2
75
70
65
50
PSRR
Power Supply Ripple
Rejection
dB
F=100KHz
40
*Only UM17735/UM17733/UM17730/UM17728/UM17725 has this function.
________________________________________________________________________
http://www.union-ic.com Rev.01 Sep.2010
3/7
UM177XX
Typical Characteristics
(shown for 3.3 V output option)
( CIN=1.0uF, COUT = 1.0 uF, TA = 25℃ unless otherwise specified.)
Figure1. Output Voltage Vs. Input Voltage
3.400
3.375
I
O
=500mA
Figure2. Dropout Voltage Vs. Output Current
350
300
Dropout Voltage(mV)
Output Voltage(V)
3.350
3.325
3.300
3.275
3.250
3.225
3.200
3.50 3.75 4.00 4.25 4.50 4.75 5.00 5.25 5.50 5.75 6.00
250
200
150
100
50
0
0
50 100 150 200 250 300 350 400 450 500
Input Voltage(V)
Output Current(mA)
Figure3. Output Voltage Vs. Temperature
3.35
Figure4. Output Voltage Vs. Output Current
3.400
3.375
V
IN
=4.2V
V
IN
=4.2V
Output Voltage(V)
3.30
Output Voltage(V)
I
LOAD
=500mA
10 20 30 40 50 60 70 80 90
o
3.350
3.325
3.300
3.275
3.250
3.225
3.200
0
50 100 150 200 250 300 350 400 450 500
3.25
3.20
3.15
-40 -30 -20 -10 0
Temperature( c)
Output Current(mA)
________________________________________________________________________
http://www.union-ic.com Rev.01 Sep.2010
4/7
UM177XX
Pin Function
___________
___________
SHDN
(Pin 1):
Shutdown, Active Low. This pin is used to put the UM177XX into shutdown. The
SHDN
pin cannot be left floating and must be tied to the input pin if not used.
GND (Pin 2):
Ground and Heat Sink. Solder to a ground plane or large pad to maximize heat
dissipation.
VIN (Pin 3):
Power for UM177XX and Load. Power is supplied to the devices through the IN pin.
The IN pin should be locally bypassed to ground if the UM177XX 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
UM177XX 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 UM177XX will act as if there is a large resistor in series with its input
with only a small amount of current flow.
VOUT (Pin 4):
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.
NC (Pin 5，6):
Not Connected.
Typical Application Circuit
________________________________________________________________________
http://www.union-ic.com Rev.01 Sep.2010
5/7
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