SGM2021
Low Power, Low Dropout,
Linear Regulators
GENERAL DESCRIPTION
The SGM2021 series low-power, low-noise, low-dropout,
CMOS linear voltage regulators operate from a 2.5V to
5.5V input voltage. They are the perfect choice for low
voltage, low power applications. A low ground current
makes this part attractive for battery operated power
systems. The SGM2021 series also offer ultra low
dropout voltage to prolong battery life in portable
electronics.
The SGM2021 features include foldback current limit and
thermal shut-down protection.
The SGM2021 has Green SOT23-3 package. It operates
over an ambient temperature range of -40°C to +85°C.
FEATURES
Low Output Noise
Low Dropout Voltage
Maximum Output Current: 300mA
Thermal-Overload Protection
Output Current Limit
Available in Multiple Output Voltage Versions
Fixed Outputs of 0.9V, 1.2V, 1.3V, 1.5V, 1.8V, 2.1V,
2.5V, 2.6V, 2.7V, 2.8V, 2.85V, 2.9V, 3.0V, 3.1V,
3.2V, 3.3V, 3.6V, 4.2V, 5.0V
-40℃ to +85℃ Operating Temperature Range
Available in Green SOT23-3 Package
APPLICATIONS
Cellular Telephones
Cordless Telephones
PHS Telephones
PCMCIA Cards
Modems
MP3 Player
Hand-Held Instruments
Palmtop Computers
Electronic Planners
Portable/Battery-Powered Equipment
PRODUCT NAME STRUCTURE
SGM2021-XXX X XX G / TR
Tape and Reel
Green Product
Package Type
N3
SOT23-3
Operating Temperature Range
Y
-40℃ to +85℃
Output Voltage
0.9
1.2
1.3
1.5
.
.
.
3.6
4.2
5.0
0.9V
1.2V
1.3V
1.5V
.
.
.
3.6V
4.2V
5.0V
SG Micro Limited
www.sg-micro.com
REV. A. 1
SGM2021
ABSOLUTE MAXIMUM RATINGS
IN to GND................................................................... -0.3V to 6V
Output Short-Circuit Duration..............................................Infinite
OUT to GND................................................. -0.3V to (V
IN
+ 0.3V)
Power Dissipation, P
D
@ T
A
= 25℃
SOT23-3 ..............................................................................0.4W
Package Thermal Resistance
SOT23-3,
θ
JA
.................................................................. 250℃/W
Low Power, Low Dropout,
Linear Regulators
Operating Temperature Range........................ -40°C to +85°C
Junction Temperature.................................................... 150°C
Storage Temperature.....................................-65 °C to +150°C
Lead Temperature (soldering, 10s)................................ 260°C
ESD Susceptibility
HBM................................................................................4000V
MM....................................................................................400V
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress
ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections
of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
PIN CONFIGURATION
(TOP VIEW)
TYPICAL APPLICATION CIRCUIT
INPUT
2.5V to 5.5V
GND
1
OUTPUT
IN
OUT
C
OUT
1μF
YLxx
SOT23-3
3
IN
C
IN
1μF
SGM2021
GND
OUT
2
NOTE:
(1) The location of pin 1 on the YLxx is determined by
orienting the package marking as shown.
(2) “xx” is the output voltage code. (For Example: when the
output voltage is 1.8V, it is expressed as 18.)
PIN DESCRIPTION
SOT23-3
3
1
2
NAME
IN
GND
OUT
FUNCTION
Regulator Input. Supply voltage can
range from 2.5V to 5.5V. Bypass
with a 1µF capacitor to GND.
Ground.
Regulator Output.
SG Micro Limited
www.sg-micro.com
2
SGM2021
Low Power, Low Dropout,
Linear Regulators
(1)
ELECTRICAL CHARACTERISTICS
(V
IN
= V
OUT (NOMINAL)
+ 0.5V , T
A
= +25°C, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Input Voltage
Output Voltage Accuracy
Current Limit
Ground Pin Current
Dropout Voltage
Line Regulation
(2)
(1)
V
IN
I
OUT
= 0.1mA, T
A
= +25°C
I
LIM
I
Q
No load
I
OUT
= 1mA
I
OUT
= 300mA
(1)
2.5
-2.2
300
310
500
120
1
270
0.03
0.003
0.005
120
62
69
5.5
2.2
V
%
mA
mA
Maximum Output Current
220
420
0.06
0.006
µA
mV
%/V
∆V
LNR
V
IN
= 2.5V or (V
OUT
+ 0.5V) to 5.5V
I
OUT
= 1mA
I
OUT
=0.1mA to 300mA, C
OUT
= 1µF,
V
OUT
> 2V
I
OUT
=0.1mA to 300mA, C
OUT
= 1µF,
V
OUT
≤
2V
f = 10Hz to 100kHz, C
OUT
= 10µF
I
LOAD
= 50mA,
C
OUT
= 1µF, V
IN
= V
OUT
+1V
f = 217Hz
f = 100Hz
Load Regulation
∆V
LDR
%/mA
0.012
µV
RMS
dB
dB
Output Voltage Noise
Power Supply Rejection Rate
THERMAL PROTECTION
e
n
PSRR
Thermal Shutdown
Temperature
Thermal Shutdown
Hysteresis
T
SHDN
∆T
SHDN
150
15
℃
℃
Note 1:
V
IN
= V
OUT (NOMINAL)
+ 0.5V or 2.5V, whichever is greater.
Note 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.)
Specifications subject to changes without notice.
SG Micro Limited
www.sg-micro.com
3
SGM2021
Low Power, Low Dropout,
Linear Regulators
TYPICAL OPERATING CHARACTERISTICS
V
IN
= V
OUT (NOMINAL)
+ 0.5V or 2.5V (whichever is greater), C
IN
= 1µF, C
OUT
= 1µF, T
A
= +25℃, unless otherwise noted.
Power-Supply Rejection Ratio vs. Frequency
100
80
PSRR (dB)
60
40
20
C
OUT
= 10µF
I
LOAD
= 50mA
V
IN
= V
OUT
+ 1V
V
OUT
= 3.3V
0.1
C
OUT
= 1µF
100
1000
0
0.01
1
10
Frequency (kHz)
SG Micro Limited
www.sg-micro.com
4
SGM2021
Low Power, Low Dropout,
Linear Regulators
TYPICAL OPERATING CHARACTERISTICS
V
IN
= V
OUT (NOMINAL)
+ 0.5V or 2.5V (whichever is greater), C
IN
= 1µF, C
OUT
= 1µF, T
A
= +25℃, unless otherwise noted.
Output Voltage vs. Load Current
2.90
2.85
2.80
2.75
SGM2021-2.8YN3G
2.70
0
50
100
150
200
250
300
Load Current (mA)
Ground Pin Current vs. Load Current
280
Ground Pin Current (µA)
Output Voltage vs. Load Current
1.90
Output Voltage (V)
Output Voltage (V)
1.85
1.80
1.75
SGM2021-1.8YN3G
1.70
0
50
100
150
200
250
300
Load Current (mA)
Ground Pin Current vs. Load Current
240
Ground Pin Current (µA)
240
200
160
120
SGM2021-2.8YN3G
80
0
50
100
150
200
Load Current (mA)
250
300
200
160
120
SGM2021-1.8YN3G
80
0
50
100
150
200
Load Current (mA)
250
300
Ground Pin Current vs. Input Voltage
160
No Load
Ground Pin Current (µA)
120
Ground Pin Current vs. Input Voltage
160
No Load
Ground Pin Current (µA)
120
80
80
40
SGM2021-2.8YN3G
0
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5
Input Voltage (V)
40
SGM2021-1.8YN3G
0
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5
Input Voltage (V)
SG Micro Limited
www.sg-micro.com
5
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