SGM2028
500mA, Ultra Low Dropout,
Low Power, RF Linear Regulators
GENERAL DESCRIPTION
The SGM2028 is a low-power, low-noise, low-dropout,
CMOS linear voltage regulator that operates from a
2.5V to 5.5V input voltage. It is the perfect choice for
low voltage, low power applications. A low ground
current makes this part attractive for battery operated
power systems. The SGM2028 also offers ultra low
dropout voltage to prolong battery life in portable
electronics. Systems requiring a quiet voltage source,
such as RF applications, will benefit from the
SGM2028’s ultra low output noise (30µV
RMS
) and high
PSRR. An external noise bypass capacitor connected
to the device’s BP pin can further reduce the noise
level.
Other features include output current limit and thermal
shutdown protection.
The SGM2028 is available in Green SOT-23-5 package.
It operates over an ambient temperature range of -40℃
to +85℃.
FEATURES
500mA Guaranteed Output Current
Ultra Low Dropout Voltage
Low Output Noise
Thermal-Overload Protection
Output Current Limit
High PSRR (73dB at 1kHz)
SGM2028-2.8, SGM2028-3.0 and SGM2028-ADJ:
110kΩ Pull Down Resistor at EN Pin
SGM2028-3.3: No Pull Down Resistor at EN Pin
Available Fixed Output Voltages: 2.8V, 3.0V and
3.3V
Adjustable Output from 1.2V to 5.0V
-40℃ to +85℃ Operating Temperature Range
Available in Green SOT-23-5 Package
APPLICATIONS
Cellular Telephones
Cordless Telephones
PCMCIA Cards
Modems
MP3 Player
Hand-Held Instruments
Palmtop Computers
Electronic Planners
Portable/Battery-Powered Equipment
SG Micro Corp
www.sg-micro.com
OCTOBER 2016 –REV. B. 3
SGM2028
PACKAGE/ORDERING INFORMATION
MODEL
SGM2028-2.8
SGM2028-3.0
SGM2028-3.3
SGM2028-ADJ
V
OUT
(V)
2.8
3.0
3.3
ADJ
SPECIFIED
PACKAGE
TEMPERATURE
DESCRIPTION
RANGE
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
-40℃ to +85℃
-40℃ to +85℃
-40℃ to +85℃
-40℃ to +85℃
500mA, Ultra Low Dropout,
Low Power, RF Linear Regulators
ORDERING
NUMBER
SGM2028-2.8YN5G/TR
SGM2028-3.0YN5G/TR
SGM2028-3.3YN5G/TR
SGM2028-ADJYN5G/TR
PACKAGE
MARKING
S58XX
G68XX
S55XX
S4BXX
PACKING
OPTION
Tape and Reel, 3000
Tape and Reel, 3000
Tape and Reel, 3000
Tape and Reel, 3000
NOTE: XX = Date Code.
Green (RoHS & HSF): SG Micro Corp defines "Green" to
mean Pb-Free (RoHS compatible) and free of halogen
substances. If you have additional comments or questions,
please contact your SGMICRO representative directly.
MARKING INFORMATION
YYY X X
Date code - Month ("A" = Jan. "B" = Feb.
…
"L" = Dec.)
Date code - Year ("A" = 2010, "B" = 2011
…)
Chip I.D.
For example: S55GJ (2016, October)
IN to GND ............................................................ -0.3V to 6V
Output Short-Circuit Duration....................................... Infinite
EN to GND .............................................. -0.3V to (V
IN
+0.3V)
OUT, BP/FB to GND .............................. -0.3V to (V
IN
+ 0.3V)
Power Dissipation, P
D
@ T
A
= +25℃
SOT-23-5 ..................................................................... 0.34W
Package Thermal Resistance
SOT-23-5,
θ
JA
.......................................................... 367℃/W
Junction Temperature .................................................+150℃
Storage Temperature Range ........................ -65℃ to +150℃
Lead Temperature (Soldering, 10s) ............................+260℃
ESD Susceptibility
HBM ............................................................................. 4000V
MM ................................................................................. 400V
ABSOLUTE MAXIMUM RATINGS
Stresses beyond those listed may cause permanent damage
to the device. Functional operation of the device at these or
any other conditions beyond those indicated in the
operational section of the specification is not implied.
Exposure to absolute maximum rating conditions for extended
periods may affect reliability.
OVERSTRESS CAUTION
Input Voltage Range ...........................................2.5V to 5.5V
Operating Temperature Range ....................... -40℃ to +85℃
RECOMMENDED OPERATING CONDITIONS
This integrated circuit can be damaged by ESD if you don’t
pay attention to ESD protection. SGMICRO recommends that
all integrated circuits be handled with appropriate precautions.
Failure to observe proper handling and installation procedures
can cause damage. ESD damage can range from subtle
performance degradation to complete device failure.
Precision integrated circuits may be more susceptible to
damage because very small parametric changes could cause
the device not to meet its published specifications.
ESD SENSITIVITY CAUTION
SG Micro Corp reserves the right to make any change in
circuit design, specification or other related things if
necessary without notice at any time.
DISCLAIMER
SG Micro Corp
www.sg-micro.com
OCTOBER 2016
2
SGM2028
PIN CONFIGURATION
500mA, Ultra Low Dropout,
Low Power, RF Linear Regulators
(TOP VIEW)
IN
GND
EN
1
2
3
SOT-23-5
5
OUT
4
BP/FB
PIN DESCRIPTION
PIN
1
2
3
NAME
IN
GND
EN
BP
4
FB
5
OUT
FUNCTION
Regulator
Input. Supply voltage can range from 2.5V to 5.5V. Bypass with a 1μF
capacitor to GND.
Ground.
Shutdown Input. A logic low reduces the supply current to 10nA. Connect to IN for
normal operation.
Reference-Noise Bypass (fixed voltage version only). Bypass with a low-leakage
0.01μF ceramic capacitor for reduced noise at the output.
Feedback Pin (adjustable voltage version only). This is used to set the output voltage of
the device.
Regulator Output.
SG Micro Corp
www.sg-micro.com
OCTOBER 2016
3
SGM2028
ELECTRICAL CHARACTERISTICS
500mA, Ultra Low Dropout,
Low Power, RF Linear Regulators
(V
IN
= V
OUT (NOMINAL)
+ 0.5V or 2.5V, whichever is greater, Full = -40℃ to +85℃. For SGM2028-ADJ, V
OUT
= 3.3V, unless
otherwise noted.)
PARAMETER
Input Voltage
Output Voltage Accuracy
Maximum Output Current
(1)
Current Limit
Ground Pin Current
Dropout Voltage
(2)
Line Regulation
Load Regulation
Output Voltage Noise
Power Supply Rejection Ratio
SHUTDOWN
EN Input Threshold
Shutdown Supply Current
Shutdown Exit Delay
(3)
THERMAL PROTECTION
Thermal Shutdown
Temperature
Thermal Shutdown
Hysteresis
T
SHDN
ΔT
SHDN
150
15
℃
℃
V
IH
V
IL
I
Q(SHDN)
V
IN
= 2.5V to 5.5V
V
EN
= 0.3V
C
BP
= 0.01μF, C
OUT
=1μF, No
Load
Full
Full
+25℃
+25℃
0.01
30
1.5
0.3
V
μA
μs
ΔV
LNR
ΔV
LDR
e
n
PSRR
I
LIM
I
Q
No Load, V
EN
= 2V
I
OUT
= 100mA
I
OUT
= 300mA
I
OUT
= 500mA
V
IN
= V
OUT
+ 0.5V to 5.5V, I
OUT
= 1mA
I
OUT
= 0.1mA to 500mA, C
OUT
= 1µF
f = 10Hz to 100kHz, C
BP
= 0.01µF,
C
OUT
= 10µF
C
BP
= 0.1μF, I
OUT
= 50mA,
C
OUT
= 1μF, V
IN
= V
OUT
+ 1V
f = 217Hz
f = 1kHz
+25℃
+25℃
+25℃
+25℃
+25℃
+25℃
SYMBOL
V
IN
I
OUT
= 0.1mA
CONDITIONS
TEMP
+25℃
+25℃
+25℃
+25℃
+25℃
MIN
2.5
-3
500
510
115
54
162
270
0.02
0.0025
30
77
73
220
90
270
420
0.095
0.0075
%/V
%/mA
µV
RMS
dB
dB
mV
TYP
MAX
5.5
+3
UNITS
V
%
mA
mA
µA
NOTES:
1. Maximum output current is affected by PCB layout, size of metal trace, the thermal conduction path between metal layers and
the environment of the system.
2. The dropout voltage is defined as V
IN
- V
OUT
, when V
OUT
is 100mV below the value of V
OUT
for V
IN
= V
OUT
+ 0.5V.
(Only applicable for V
OUT
= +2.5V to +5.0V.)
3. Time needed for V
OUT
to reach 90% of final value.
SG Micro Corp
www.sg-micro.com
OCTOBER 2016
4
SGM2028
TYPICAL APPLICATION CIRCUITS
INPUT
2.5V to 5.5V
IN
C
IN
1μF
OUT
C
OUT
1μF
500mA, Ultra Low Dropout,
Low Power, RF Linear Regulators
OUTPUT
INPUT
2.5V to 5.5V
C
IN
1μF
OUTPUT
IN
OUT
C
OUT
1μF
SGM
2028-ADJ
EN
FB
GND
R
1
SGM2028
OFF
EN
GND
BP
ON
OFF
R
2
ON
C
BP
0.01μF
NOTE: Choose R
2
= 47kΩ
to maintain a
26μA
minimum
load. Calculate the value for R
1
using the following
equation:
V
R
1
R
2
×
OUT
-1
=
1.206V
SG Micro Corp
www.sg-micro.com
OCTOBER 2016
5
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