SGM2028
500mA, Ultra-Low Dropout,
Low Power, RF Linear Regulator
GENERAL DESCRIPTION
FEATURES
The SGM2028 is a low dropout voltage, low power and
Operating Input Voltage Range: 2.5V to 5.5V
low noise RF linear regulator. It is capable of supplying
Fixed Output Voltages: 2.8V, 3.0V, 3.3V
500mA output current with typical dropout voltage of
Adjustable Output Voltage Range: 1.2V to 5.0V
only 270mV. The operating input voltage range is from
500mA Guaranteed Output Current
2.5V to 5.5V.
Output Voltage Accuracy: ±3% at +25℃
Other features include logic-controlled shutdown mode,
short-circuit current
limit
and
thermal
shutdown
protection.
The SGM2028 is available in a Green SOT-23-5
package. It operates over an operating temperature
range of -40℃ to +85℃.
High PSRR: 73dB (TYP) at 1kHz
Ultra-Low Dropout Voltage:
270mV (TYP) at 500mA
Low Output Noise: 30μVRMS (TYP)
Thermal Shutdown Protection
Output Current Limit
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
-40℃ to +85℃ Operating Temperature Range
Available in a Green SOT-23-5 Package
APPLICATIONS
Modems
MP3 Players
Cellular Telephones
PCMCIA Cards
Palmtop Computers
Portable Electronics
SG Micro Corp
www.sg-micro.com
JUNE 2020 – REV.B.4
500mA, Ultra-Low Dropout,
Low Power, RF Linear Regulator
SGM2028
PACKAGE/ORDERING INFORMATION
SPECIFIED
PACKAGE
TEMPERATURE
DESCRIPTION
RANGE
ORDERING
NUMBER
PACKAGE
MARKING
PACKING
OPTION
-40℃ to +85℃
SGM2028-2.8YN5G/TR
S58XX
Tape and Reel, 3000
SOT-23-5
-40℃ to +85℃
SGM2028-3.0YN5G/TR
G68XX
Tape and Reel, 3000
3.3
SOT-23-5
-40℃ to +85℃
SGM2028-3.3YN5G/TR
S55XX
Tape and Reel, 3000
ADJ
SOT-23-5
-40℃ to +85℃
SGM2028-ADJYN5G/TR
S4BXX
Tape and Reel, 3000
MODEL
VOUT (V)
SGM2028-2.8
2.8
SOT-23-5
SGM2028-3.0
3.0
SGM2028-3.3
SGM2028-ADJ
MARKING INFORMATION
NOTE: XX = Date Code.
YYY X X
Date Code - Month
Date Code - Year
Serial Number
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.
ABSOLUTE MAXIMUM RATINGS
IN to GND ............................................................ -0.3V to 6V
Output Short-Circuit Duration....................................... Infinite
EN to GND .............................................. -0.3V to (VIN +0.3V)
OUT, BP/FB to GND .............................. -0.3V to (VIN + 0.3V)
Power Dissipation, PD @ TA = +25℃
SOT-23-5 ..................................................................... 0.53W
Package Thermal Resistance
SOT-23-5, θJA .......................................................... 235℃/W
Junction Temperature .................................................+150℃
Storage Temperature Range ........................ -65℃ to +150℃
Lead Temperature (Soldering, 10s) ............................+260℃
ESD Susceptibility
HBM ............................................................................. 4000V
MM ................................................................................. 400V
RECOMMENDED OPERATING CONDITIONS
Input Voltage Range ...........................................2.5V to 5.5V
Operating Temperature Range ....................... -40℃ to +85℃
OVERSTRESS CAUTION
Stresses beyond those listed in Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to
absolute maximum rating conditions for extended periods
may affect reliability. Functional operation of the device at any
conditions beyond those indicated in the Recommended
Operating Conditions section is not implied.
ESD SENSITIVITY CAUTION
This integrated circuit can be damaged if ESD protections are
not considered carefully. 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 even small parametric changes could
cause the device not to meet the published specifications.
DISCLAIMER
SG Micro Corp reserves the right to make any change in
circuit design, or specifications without prior notice.
SG Micro Corp
www.sg-micro.com
JUNE 2020
2
500mA, Ultra-Low Dropout,
Low Power, RF Linear Regulator
SGM2028
PIN CONFIGURATION
(TOP VIEW)
IN
1
GND
2
EN
3
5
OUT
4
BP/FB
SOT-23-5
PIN DESCRIPTION
PIN
NAME
FUNCTION
1
IN
Input Supply Voltage Pin. It is recommended to use a 1μF or larger ceramic capacitor from IN pin
to ground.
2
GND
3
EN
BP
4
5
FB
OUT
SG Micro Corp
www.sg-micro.com
Ground.
Enable Pin. Drive EN high to turn on the regulator. Drive EN low to turn off the regulator. This pin
must be connected to IN pin if enable functionality is not used.
Reference-Noise Bypass Pin (fixed voltage version only). Bypass with an external capacitor CBP
can reduce output noise to very low level.
Feedback Voltage Input Pin (adjustable voltage version only). Connect this pin to the midpoint of
an external resistor divider to adjust the output voltage. Place the resistors as close as possible
to this pin.
Regulator Output Pin. It is recommended to use 1μF or larger ceramic output capacitor from
OUT pin to ground. The capacitor should be located very close to this pin.
JUNE 2020
3
500mA, Ultra-Low Dropout,
Low Power, RF Linear Regulator
SGM2028
ELECTRICAL CHARACTERISTICS
(VIN = VOUT (NOMINAL) + 0.5V or 2.5V, whichever is greater, Full = -40℃ to +85℃. For SGM2028-ADJ, VOUT = 3.3V, unless
otherwise noted.)
PARAMETER
Input Voltage
SYMBOL
CONDITIONS
VIN
Output Voltage Accuracy
IOUT = 0.1mA
Maximum Output Current
Output Current Limit
ILIMIT
Ground Pin Current
IQ
No load, VEN = 2V
TEMP
MIN
MAX
UNITS
+25℃
2.5
5.5
V
+25℃
-3
+3
%
+25℃
500
mA
+25℃
510
mA
+25℃
115
54
90
+25℃
162
270
270
420
IOUT = 100mA
Dropout Voltage
(1)
IOUT = 300mA
TYP
IOUT = 500mA
220
µA
mV
Line Regulation
ΔVLNR
VIN = VOUT + 0.5V to 5.5V, IOUT = 1mA
+25℃
0.02
0.095
%/V
Load Regulation
ΔVLDR
IOUT = 0.1mA to 500mA, COUT = 1µF
+25℃
0.0025
0.0075
%/mA
en
f = 10Hz to 100kHz, CBP = 0.01µF,
COUT = 10µF
+25℃
30
µVRMS
+25℃
77
dB
+25℃
73
dB
Output Voltage Noise
Power Supply Rejection Ratio
PSRR
CBP = 0.1μF, IOUT = 50mA,
COUT = 1μF, VIN = VOUT + 1V
f = 217Hz
f = 1kHz
Shutdown
VIH
EN Input Threshold
VIL
Shutdown Supply Current
Shutdown Exit Delay
IQ(SHDN)
VIN = 2.5V to 5.5V
Full
1.5
Full
0.3
V
VEN = 0.3V
+25℃
0.01
μA
CBP = 0.01μF, COUT =1μF, no load
+25℃
30
μs
TSHDN
150
℃
ΔTSHDN
15
℃
(2)
Thermal Protection
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
NOTES:
1. The dropout voltage is defined as VIN - VOUT, when VOUT is 100mV below the value of VOUT for VIN = VOUT + 0.5V.
(Only applicable for VOUT = +2.5V to +5.0V.)
2. Time needed for VOUT to reach 90% of final value.
SG Micro Corp
www.sg-micro.com
JUNE 2020
4
500mA, Ultra-Low Dropout,
Low Power, RF Linear Regulator
SGM2028
TYPICAL APPLICATION CIRCUITS
VIN
2.5V to 5.5V
VOUT
OUT
IN
CIN
1μF
ON
SGM2028
-ADJ
COUT
1μF
R1
FB
EN
OFF
GND
R2
NOTE: Choose R2 = 47kΩ to maintain a 26μA minimum load. Calculate the value for R1 using the following equation:
V
R=
R2 × OUT -1
1
1.206V
VIN
2.5V to 5.5V
VOUT
IN
CIN
1μF
ON
OUT
SGM2028
OFF
EN
BP
COUT
1μF
CBP
0.01μF
GND
SG Micro Corp
www.sg-micro.com
JUNE 2020
5
SGM2028
500mA, Ultra-Low Dropout,
Low Power, RF Linear Regulator
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = VOUT (NOMINAL) + 0.5V or 2.5V, whichever is greater, CIN = 1μF, COUT = 1μF, CBP = 0.01μF, TA = +25℃, unless otherwise
noted.
SG Micro Corp
www.sg-micro.com
JUNE 2020
6
500mA, Ultra-Low Dropout,
Low Power, RF Linear Regulator
SGM2028
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = VOUT (NOMINAL) + 0.5V or 2.5V, whichever is greater, CIN = 1μF, COUT = 1μF, CBP = 0.01μF, TA = +25℃, unless otherwise
noted.
Pow er Supply Rejection Ratio vs. Frequency
Dropout Voltage vs. Load Current
100
Dropout Voltage (mV)
350
PSRR (dB)
80
COUT = 10μF
60
CBP = 0.1μF
ILOAD = 50mA
V IN = 4.3V to 4.4V
V OUT = 3.3V
40
20
0.01
0.1
1
COUT = 1μF
10
100
TA = +85℃
300
250
200
150
TA = -40℃
100
TA = +25℃
50
SGM2028-3.3
0
1000
0
100
Output Voltage vs. Load Current
3.4
Output Voltage (V)
Output Voltage (V)
4
3.3
3.2
SGM2028-3.3
300
400
3.2
2.4
1.6
0.8
SGM2028-3.3
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5
500
Input Voltage (V)
Load Current (mA)
1.006
Normalized Output Voltage
Ground Pin Current (µA)
Normalized Output Voltage vs. Temperature
Ground Pin Current vs. Load Current
350
300
250
200
150
SGM2028-3.3
100
0
100
200
300
Load Current (mA)
SG Micro Corp
www.sg-micro.com
500
No Load
0
3.1
200
400
Output Voltage vs. Input Voltage
3.5
100
300
Load Current (mA)
Frequency (kHz)
0
200
400
500
1.004
Normalized to TA = +25℃
ILOAD = 0.1mA
1.002
1.000
0.998
0.996
SGM2028-3.3
0.994
-40
-15
10
35
60
85
Temperature (℃)
JUNE 2020
7
500mA, Ultra-Low Dropout,
Low Power, RF Linear Regulator
SGM2028
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = VOUT (NOMINAL) + 0.5V or 2.5V, whichever is greater, CIN = 1μF, COUT = 1μF, CBP = 0.01μF, TA = +25℃, unless otherwise
noted.
140
Ground Pin Current vs. Temperature
Ground Pin Current vs. Input Voltage
No Load
120
100
80
60
40
20
SGM2028-3.3
0
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5
Input Voltage (V)
SG Micro Corp
www.sg-micro.com
160
Ground Pin Current (μA)
Ground Pin Current (µA)
160
145
No Load
130
115
100
85
70
-40
SGM2028-3.3
-15
10
35
60
85
Temperature (℃)
JUNE 2020
8
SGM2028
500mA, Ultra-Low Dropout,
Low Power, RF Linear Regulator
APPLICATION INFORMATION
The SGM2028 is a low power and low dropout LDO
and provides 500mA output current. These features
make the device a reliable solution to solve many
challenging problems in the generation of clean and
accurate power supply. The high performance also
makes the SGM2028 useful in a variety of applications.
The SGM2028 provides protection functions for output
overload, output short-circuit condition and overheating.
Input Capacitor Selection (CIN)
The input decoupling capacitor is necessary to be
connected as close as possible to the IN pin for
ensuring the device stability. 1μF or larger X7R or X5R
ceramic capacitor is selected to get good dynamic
performance.
When VIN is required to provide large current
instantaneously, a large effective input capacitor is
required. Multiple input capacitors can limit the input
tracking inductance. Adding more input capacitors is
available to restrict the ringing and to keep it below the
device absolute maximum ratings.
Output Capacitor Selection (COUT)
The output decoupling capacitor should be located as
close as possible to the OUT pin. 1μF or larger X7R or
X5R ceramic capacitor is selected to get good dynamic
performance. The minimum effective capacitance of
COUT that SGM2028 can remain stable is 0.5μF. For
ceramic capacitor, temperature, DC bias and package
size will change the effective capacitance, so enough
margin of COUT must be considered in design. Larger
capacitance and lower ESR COUT will help improve the
load transient response and increase the high
frequency PSRR.
SG Micro Corp
www.sg-micro.com
Enable Control
The SGM2028 uses the EN pin to enable/disable its
device.
When the EN pin voltage is lower than 0.3V, the device
is in shutdown state. There is no current flowing from IN
pin to OUT pin.
When the EN pin voltage is higher than 1.5V, the
device is in active state. The output voltage is regulated
to expected value
Output Current Limit and Short-Circuit
Protection
When overload events happen, the output current is
internally limited to 510mA (MIN). When the OUT pin is
shorted to ground, the short-circuit protection will limit
the output current.
Thermal Shutdown
The SGM2028 can detect the temperature of die. When
the die temperature exceeds the threshold value of
thermal shutdown, the SGM2028 will be in shutdown
state and it will remain in this state until the die
temperature decreases to +135℃.
Layout Guidelines
To get good PSRR, low output noise and high transient
response performance, the input and output bypass
capacitors must be placed as close as possible to the
IN pin and OUT pin separately. VIN and VOUT had better
use separate ground planes and these ground planes
are single point connected to the GND pin.
JUNE 2020
9
SGM2028
500mA, Ultra-Low Dropout,
Low Power, RF Linear Regulator
REVISION HISTORY
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
JUNE 2020 ‒ REV.B.3 to REV.B.4 ................................................................................................................................................................... Page
Updated Absolute Maximum Ratings section ...........................................................................................................................................................2
OCTOBER 2016 ‒ REV.B.2 to REV.B.3 ........................................................................................................................................................... Page
Added SGM2028-3.0 version (110kΩ Pull Down Resistor at EN Pin).....................................................................................................................All
MAY 2016 ‒ REV.B.1 to REV.B.2 ..................................................................................................................................................................... Page
Changed Normalized Output Voltage vs. Temperature .............................................................................................................................................7
DECEMBER 2013 ‒ REV.B to REV.B.1 ........................................................................................................................................................... Page
Added 2.8V Output Voltage and ADJ ......................................................................................................................................................................All
Changed Electrical Characteristics section ...............................................................................................................................................................4
Changed Typical Application Circuits section ............................................................................................................................................................5
Changed Typical Performance Characteristics section .........................................................................................................................................7, 8
JUNE 2013 ‒ REV.A.4 to REV.B ...................................................................................................................................................................... Page
Deleted 2.8V Output Voltage ...................................................................................................................................................................................All
SG Micro Corp
www.sg-micro.com
JUNE 2020
10
PACKAGE INFORMATION
PACKAGE OUTLINE DIMENSIONS
SOT-23-5
1.90
D
e1
E1
2.59
E
0.99
b
e
0.69
0.95
RECOMMENDED LAND PATTERN (Unit: mm)
L
A
A1
θ
A2
Symbol
Dimensions
In Millimeters
MIN
MAX
c
0.2
Dimensions
In Inches
MIN
MAX
A
1.050
1.250
0.041
0.049
A1
0.000
0.100
0.000
0.004
A2
1.050
1.150
0.041
0.045
b
0.300
0.500
0.012
0.020
c
0.100
0.200
0.004
0.008
D
2.820
3.020
0.111
0.119
E
1.500
1.700
0.059
0.067
E1
2.650
2.950
0.104
0.116
e
0.950 BSC
e1
SG Micro Corp
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0.037 BSC
1.900 BSC
0.075 BSC
L
0.300
0.600
0.012
0.024
θ
0°
8°
0°
8°
TX00033.000
PACKAGE INFORMATION
TAPE AND REEL INFORMATION
REEL DIMENSIONS
TAPE DIMENSIONS
P2
W
P0
Q1
Q2
Q1
Q2
Q1
Q2
Q3
Q4
Q3
Q4
Q3
Q4
B0
Reel Diameter
K0
A0
P1
Reel Width (W1)
DIRECTION OF FEED
NOTE: The picture is only for reference. Please make the object as the standard.
KEY PARAMETER LIST OF TAPE AND REEL
Reel
Diameter
Reel Width
W1
(mm)
A0
(mm)
B0
(mm)
K0
(mm)
P0
(mm)
P1
(mm)
P2
(mm)
W
(mm)
Pin1
Quadrant
SOT-23-5
7″
9.5
3.20
3.20
1.40
4.0
4.0
2.0
8.0
Q3
SG Micro Corp
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TX10000.000
DD0001
Package Type
PACKAGE INFORMATION
CARTON BOX DIMENSIONS
NOTE: The picture is only for reference. Please make the object as the standard.
KEY PARAMETER LIST OF CARTON BOX
Length
(mm)
Width
(mm)
Height
(mm)
Pizza/Carton
7″ (Option)
368
227
224
8
7″
442
410
224
18
SG Micro Corp
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DD0002
Reel Type
TX20000.000
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