SGM2048 [SGMICRO]
1A, Low Noise, Wide Bandwidth, High PSRR, Low Dropout Linear Regulator;
| 型号： | SGM2048 |
| 厂家： | 
Shengbang Microelectronics Co, Ltd |
| 描述： | 1A, Low Noise, Wide Bandwidth, High PSRR, Low Dropout Linear Regulator |
| 文件： | 总17页 (文件大小：1458K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SGM2048
1A, Low Noise, Wide Bandwidth,
High PSRR, Low Dropout Linear Regulator
GENERAL DESCRIPTION
FEATURES
The SGM2048 is a low noise, high PSRR, low dropout
voltage linear regulator. It is capable of supplying 1A
output current with typical dropout voltage of only
150mV. The operating input voltage range is from 2.2V
to 7V. The SGM2048 is available in fixed output voltage
versions and an adjustable version that allows the
output voltage range from 0.8V to 6V.
● Operating Input Voltage Range: 2.2V to 7V
● Fixed Outputs of 1.2V, 1.8V, 2.8V, 3.0V, 3.3V, 5.0V
● Adjustable Output from 0.8V to 6V
● Output Voltage Accuracy: ±1% at +25℃
● Low Dropout Voltage: 150mV (TYP) at 1A
● Low Noise: 30μVRMS (TYP)
● Power Supply Rejection Ratio at VOUT = 3.3V:
75dB at 1kHz
Other features include logic-controlled shutdown mode,
short-circuit current limit and thermal shutdown
protection. The SGM2048 has automatic discharge
function to quickly discharge VOUT in the disabled status.
65dB at 100kHz
55dB at 1MHz
● Current Limiting and Thermal Protection
● Excellent Load and Line Transient Responses
● With Output Automatic Discharge
● Stable with Small Case Size Ceramic Capacitors
● -40℃ to +125℃ Operating Temperature Range
● Available in a Green TDFN-3×3-8CL Package
The SGM2048 is available in a Green TDFN-3×3-8CL
package. It operates over an operating temperature
range of -40℃ to +125℃.
APPLICATIONS
Wireless Basestation
PLL/VCO/RF Circuit
Audio Equipment
TYPICAL APPLICATION
VIN
VIN
IN
IN
VOUT
VOUT
OUT
SNS
OUT
FB
ON
OFF
ON
OFF
EN
EN
R1
R2
SGM2048-FIX
SGM2048-ADJ
CIN
10μF
COUT
10μF
CIN
COUT
10μF
10μF
NR
NR
GND
GND
CNR
10nF
CNR
10nF
Fixed Voltage Typical Application Circuit
Adjustable Voltage Typical Application Circuit
Figure 1. Typical Application Circuits
SG Micro Corp
OCTOBER 2022 – REV. A. 3
www.sg-micro.com
1A, Low Noise, Wide Bandwidth,
SGM2048
High PSRR, Low Dropout Linear Regulator
PACKAGE/ORDERING INFORMATION
SPECIFIED
TEMPERATURE
RANGE
PACKAGE
DESCRIPTION
ORDERING
NUMBER
PACKAGE
MARKING
PACKING
OPTION
MODEL
SGMSXU
XTEK8
XXXXX
SGMSXV
XTEK8
XXXXX
SGMSXW
XTEK8
XXXXX
SGMSXX
XTEK8
XXXXX
SGMSXY
XTEK8
XXXXX
SGMRB0
XTEK8
XXXXX
SGMRAF
XTEK8
SGM2048-1.2
SGM2048-1.8
SGM2048-2.8
SGM2048-3.0
SGM2048-3.3
SGM2048-5.0
TDFN-3×3-8CL
SGM2048-1.2XTEK8G/TR
SGM2048-1.8XTEK8G/TR
SGM2048-2.8XTEK8G/TR
SGM2048-3.0XTEK8G/TR
SGM2048-3.3XTEK8G/TR
SGM2048-5.0XTEK8G/TR
SGM2048-ADJXTEK8G/TR
Tape and Reel, 4000
Tape and Reel, 4000
Tape and Reel, 4000
Tape and Reel, 4000
Tape and Reel, 4000
Tape and Reel, 4000
Tape and Reel, 4000
-40℃ to +125℃
-40℃ to +125℃
-40℃ to +125℃
-40℃ to +125℃
-40℃ to +125℃
-40℃ to +125℃
-40℃ to +125℃
TDFN-3×3-8CL
TDFN-3×3-8CL
TDFN-3×3-8CL
TDFN-3×3-8CL
TDFN-3×3-8CL
SGM2048-ADJ TDFN-3×3-8CL
XXXXX
MARKING INFORMATION
NOTE: XXXXX = Date Code, Trace Code and Vendor Code.
X X X X X
Vendor Code
Trace Code
Date Code - Year
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.
SG Micro Corp
www.sg-micro.com
OCTOBER 2022
2
1A, Low Noise, Wide Bandwidth,
SGM2048
High PSRR, Low Dropout Linear Regulator
OVERSTRESS CAUTION
ABSOLUTE MAXIMUM RATINGS
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.
IN, OUT to GND................................................... -0.3V to 8V
FB, NR to GND................................................. -0.3V to 3.6V
EN to GND........................................................... -0.3V to 7V
Package Thermal Resistance
TDFN-3×3-8CL, θJA ................................................... 53℃/W
TDFN-3×3-8CL, θJB ................................................... 19℃/W
TDFN-3×3-8CL, θJC ................................................... 46℃/W
Junction Temperature.................................................+150℃
Storage Temperature Range.......................-65℃ to +150℃
Lead Temperature (Soldering, 10s)............................+260℃
ESD Susceptibility
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.
Failureto observe proper handlingand installation procedures
can cause damage. ESD damage can range from subtle
performance degradation tocomplete 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.
HBM.............................................................................6000V
CDM ............................................................................1000V
RECOMMENDED OPERATING CONDITIONS
Operating Input Voltage Range, VIN.......................2.2V to 7V
Adjustable Output Voltage Range..........................0.8V to 6V
Fixed Output Voltage Range..................................1.2V to 5V
Enable Voltage Range..............................................0V to 7V
Input Effective Capacitance, CIN ............................ 4µF (MIN)
Output Effective Capacitance, COUT..................4μF to 100μF
Noise Reduction Capacitance, CNR........................ 1nF (MIN)
Operating Junction Temperature Range......-40℃ to +125℃
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
OCTOBER 2022
3
1A, Low Noise, Wide Bandwidth,
SGM2048
High PSRR, Low Dropout Linear Regulator
PIN CONFIGURATIONS
SGM2048-Fixed Output
(TOP VIEW)
SGM2048-ADJ
(TOP VIEW)
OUT
OUT
SNS
GND
1
2
3
4
8
7
6
5
IN
OUT
OUT
FB
1
2
3
4
8
7
6
5
IN
IN
IN
NR
EN
NR
EN
GND
TDFN-3×3-8CL
TDFN-3×3-8CL
PIN DESCRIPTION
PIN
NAME
FUNCTION
Regulator Output Pin. It is recommended to use a ceramic capacitor with effective capacitance in
the range of 4μF to 100μF to ensure stability. This ceramic capacitor should be placed as close
as possible to OUT pin.
1, 2
OUT
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.
FB
3
Output Voltage Sense Input Pin (fixed voltage version only). Connect this pin to the load side of
the output trace only in the fixed voltage version.
SNS
GND
4
5
Ground.
Enable Pin. Drive EN high to turn on the regulator. Drive EN low to turn off the regulator. The EN
pin has an internal pull-down current source which ensures that the device is turned off when the
EN pin is floated. This pin must be pulled high by an external resistor connected to IN pin if EN
pin is not used.
EN
Noise-Reduction Pin. Using an external capacitor CNR to decouple this pin to GND can not only
reduce output noise to very low level but also slow down the VOUT rise like a soft-start behavior.
Input Supply Voltage Pin. It is recommended to use a 4.7μF or larger ceramic capacitor from IN
pin to ground to get good power supply decoupling. This ceramic capacitor should be placed as
close as possible to IN pin.
6
NR
IN
‒
7, 8
Exposed
Pad
Exposed Pad. Connect it to a large ground plane to maximize thermal performance. This pad is
not an electrical connection point.
SG Micro Corp
www.sg-micro.com
OCTOBER 2022
4
1A, Low Noise, Wide Bandwidth,
SGM2048
High PSRR, Low Dropout Linear Regulator
ELECTRICAL CHARACTERISTICS
(VIN = (VOUT(NOM) + 0.5V) or 2.2V (whichever is greater), VEN = 2.2V, IOUT = 1mA, CIN = COUT = 4.7μF and CNR = 10nF. For
SGM2048-ADJ, tested at VOUT = 0.8V, TJ = -40℃ to +125℃, typical values are at TJ = +25℃, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Adjustable voltage version
0.8
6
Output Voltage Range
VOUT
V
Fixed voltage version
1.2
5
Adjustable and Fixed voltage versions, VOUT < 1.8V
Fixed voltage version, VOUT ≥ 1.8V
VIN rising, RL = 1kΩ
0.788
1.182
1.9
0.8
1.2
2
0.812
1.218
2.1
Internal Reference Voltage
Under-Voltage Lockout Thresholds
Output Voltage Accuracy
Shutdown Current
VNR
VUVLO
VOUT
ISHDN
V
V
Hysteresis
150
mV
-1
-2
1
2
TJ = +25℃
VIN = (VOUT(NOM) + 0.5V) to 7V,
IN ≥ 2.2V, IOUT = 1mA to 1A
%
V
TJ = -40℃ to +125℃
TJ = -40℃ to +85℃
TJ = -40℃ to +125℃
1
2.5
6
VEN ≤ 0.4V, VIN ≥ 2.2V,
RL = 1kΩ
μA
∆VOUT
∆VIN × VOUT
VIN = (VOUT(NOM) + 0.5V) to 7V, VIN ≥ 2.2V,
OUT = 100mA
Line Regulation
Load Regulation
0.004 0.029
%/V
I
ΔVOUT/ΔIOUT IOUT = 1mA to 1A
1
80
15
μV/mA
V
IN ≥ 2.2V, IOUT = 500mA
130
200
260
2.15
Dropout Voltage
VDROP
VFB = GND or VSNS = GND VIN ≥ 2.5V, IOUT = 750mA
VIN ≥ 2.5V, IOUT = 1A
115
150
1.6
mV
Output Current Limit
Short Current Limit
ILIMIT
VOUT = 90% × VOUT(NOM), VIN = (VOUT(NOM) + 1V)
VOUT = 0V
1.05
A
A
ISHORT
1.6
I
OUT = 1mA, adjustable voltage version
80
115
150
1450
0.1
Ground Pin Current
IGND
IOUT = 1mA, fixed voltage version
IOUT = 1A
100
1100
0.001
μA
Feedback Pin Current
IFB
VIN = 6.5V, VFB = 0.85V
μA
V
EN Pin High-Level Input Voltage
EN Pin Low-Level Input Voltage
VEN(H)
VEN(L)
1.2
2.2V < VIN ≤ 7V, RL = 1kΩ
0.4
1
V
VIN = 7V, VEN = 0V
VIN = VEN = 7V
0.001
0.13
0.2
1.8
78
EN Pin Current
Start-Up Time
IEN
μA
1
C
NR = 1nF
VOUT(NOM) = 3.3V, from assertion of
tSTR
ms
V
EN to 90% × VOUT(NOM), RL = 3.3kΩ
CNR = 10nF
f = 100Hz
f = 1kHz
75
VIN = 4.3V, VOUT(NOM) = 3.3V,
OUT = 750mA, CNR = 10nF
Power Supply Rejection Ratio
PSRR
f = 10kHz
f = 100kHz
f = 1MHz
75
dB
I
65
55
CNR = 1nF
CNR = 10nF
CNR = 100nF
60
VIN = 4.3V, VOUT(NOM) = 3.3V,
OUT = 100mA, f = 10Hz to 100kHz
Output Voltage Noise
en
36
μVRMS
I
30
Output Discharge Resistance
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
RDIS
TSHDN
ΔTSHDN
105
170
20
Ω
℃
℃
SG Micro Corp
www.sg-micro.com
OCTOBER 2022
5
1A, Low Noise, Wide Bandwidth,
SGM2048
High PSRR, Low Dropout Linear Regulator
TYPICAL PERFORMANCE CHARACTERISTICS
TJ = +25℃, VIN = (VOUT(NOM) + 0.5V) or 2.2V (whichever is greater), VOUT(NOM) = 3.3V, VEN = VIN, IOUT = 100mA, CIN = COUT = 4.7µF,
CNR = 10nF, unless otherwise noted.
Line Transient Response
Load Transient Response
VIN
VOUT
VIN
IOUT
VOUT
VIN = 3.8V, IOUT = 100mA to 1A
VIN = 3.8V to 4.8V, IOUT = 500mA
Time (50μs/div)
Time (50μs/div)
Enable Pulse Response
Power-Up and Power-Down Response
5
4
7
6
VEN
VIN = VEN
5
3
4
VOUT
3
VOUT
2
2
1
1
0
0
-1
-2
VIN = VEN = 0V to 6.5V, RLOAD = 33Ω
VIN = 3.8V, VEN = 0V to 3.8V, RLOAD = 33Ω
-1
-2
-1
0
1
2
3
4
5
6
7
-2
-1
0
1
2
3
4
5
6
7
1ms/div
1ms/div
Output Noise Density vs. Frequency
Output Noise Density vs. Frequency
10
1
10
1
0.1
0.1
0.01
0.001
0.01
0.001
— 33.23μVRMS (IOUT = 10mA)
— 35.89μVRMS (IOUT = 100mA)
— 31.23μVRMS (IOUT = 750mA)
— 35.89μVRMS (COUT = 4.7μF)
— 39.39μVRMS (COUT = 22μF)
— 39.74μVRMS (COUT = 47μF)
VIN = 3.8V
VIN = 3.8V
0.01
0.1
1
10
100
0.01
0.1
1
10
100
Frequency (kHz)
Frequency (kHz)
SG Micro Corp
www.sg-micro.com
OCTOBER 2022
6
1A, Low Noise, Wide Bandwidth,
SGM2048
High PSRR, Low Dropout Linear Regulator
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
TJ = +25℃, VIN = (VOUT(NOM) + 0.5V) or 2.2V (whichever is greater), VOUT(NOM) = 3.3V, VEN = VIN, IOUT = 100mA, CIN = COUT = 4.7µF,
CNR = 10nF, unless otherwise noted.
Output Noise Density vs. Frequency
Power Supply Rejection Ratio vs. Frequency
10
1
100
80
60
40
20
0
0.1
0.01
— 60.09μVRMS (CNR = 1nF)
— 35.89μVRMS (CNR = 10nF)
— 29.58μVRMS (CNR = 100nF)
— VDROP = 0.3V
— VDROP = 0.5V
— VDROP = 1V
No CIN
VIN = 3.8V
100
0.001
0.01
0.1
1
10
0.01
0.1
1
10
100
1000 10000
Frequency (kHz)
Frequency (kHz)
Power Supply Rejection Ratio vs. Frequency
Power Supply Rejection Ratio vs. Frequency
100
80
60
40
20
0
100
80
60
40
20
0
— IOUT = 10mA
— IOUT = 100mA
— IOUT = 750mA
— IOUT = 10mA
— IOUT = 100mA
— IOUT = 750mA
VIN = 3.8V, No CIN
— IOUT = 1A
VIN = 4.3V, No CIN
— IOUT = 1A
0.01
0.1
1
10
100
1000 10000
0.01
0.1
1
10
100
1000 10000
Frequency (kHz)
Frequency (kHz)
Power Supply Rejection Ratio vs. Frequency
Power Supply Rejection Ratio vs. Frequency
100
80
60
40
20
0
100
80
60
40
20
0
— IOUT = 10mA
— IOUT = 10mA
VIN = 3.8V,
OUT = 100μF,
No CIN
— IOUT = 100mA
— IOUT = 750mA
— IOUT = 1A
— IOUT = 100mA
— IOUT = 750mA
— IOUT = 1A
VIN = 4.3V,
OUT = 100μF,
No CIN
C
C
0.01
0.1
1
10
100 1000 10000
0.01
0.1
1
10
100 1000 10000
Frequency (kHz)
Frequency (kHz)
SG Micro Corp
www.sg-micro.com
OCTOBER 2022
7
1A, Low Noise, Wide Bandwidth,
SGM2048
High PSRR, Low Dropout Linear Regulator
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
TJ = +25℃, VIN = (VOUT(NOM) + 0.5V) or 2.2V (whichever is greater), VOUT(NOM) = 3.3V, VEN = VIN, IOUT = 100mA, CIN = COUT = 4.7µF,
CNR = 10nF, unless otherwise noted.
Power Supply Rejection Ratio vs. (VIN - VOUT
)
Power Supply Rejection Ratio vs. (VIN - VOUT)
100
80
60
40
20
0
100
80
60
40
20
0
— f = 1kHz
— f = 10kHz
— f = 100kHz
— f = 1MHz
— f = 1kHz
— f = 10kHz
— f = 100kHz
No CIN
3.5
IOUT = 750mA, No CIN
— f = 1MHz
0.5 1.5
VIN - VOUT (V)
0
0.5
1
1.5
2
2.5
3
4
7
7
0
1
2
2.5
3
3.5
4
7
7
VIN - VOUT (V)
Dropout Voltage vs. Input Voltage
Dropout Voltage vs. Input Voltage
120
100
80
60
40
20
0
180
150
120
90
— TJ = -40℃
— TJ = 0℃
— TJ = +25℃
— TJ = +85℃
— TJ = +125℃
— TJ = -40℃
— TJ = 0℃
— TJ = +25℃
— TJ = +85℃
— TJ = +125℃
60
30
IOUT = 500mA
IOUT = 750mA
0
2.2
3
3.8
4.6
5.4
6.2
2.2
3
3.8
4.6
5.4
6.2
Input Voltage (V)
Input Voltage (V)
Dropout Voltage vs. Input Voltage
Ground Pin Current vs. Input Voltage
250
200
150
100
50
1200
1100
1000
900
— TJ = -40℃
— TJ = 0℃
— TJ = +25℃
— TJ = +85℃
— TJ = +125℃
— TJ = -40℃
— TJ = 0℃
— TJ = +25℃
— TJ = +85℃
— TJ = +125℃
800
700
VOUT = 0.8V,
IOUT = 1A
6.2
I
OUT = 750mA
0
600
2.2
3
3.8
4.6
5.4
2.2
3
3.8
4.6
5.4 6.2
Input Voltage (V)
Input Voltage (V)
SG Micro Corp
www.sg-micro.com
OCTOBER 2022
8
1A, Low Noise, Wide Bandwidth,
SGM2048
High PSRR, Low Dropout Linear Regulator
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
TJ = +25℃, VIN = (VOUT(NOM) + 0.5V) or 2.2V (whichever is greater), VOUT(NOM) = 3.3V, VEN = VIN, IOUT = 100mA, CIN = COUT = 4.7µF,
CNR = 10nF, unless otherwise noted.
Load Regulation
Load Regulation Under Light Loads
3.32
3.31
3.30
3.29
3.28
3.27
3.32
3.31
3.30
3.29
3.28
3.27
— TJ = -40℃
— TJ = -40℃
— TJ = 0℃
— TJ = +25℃
— TJ = +85℃
— TJ = +125℃
— TJ = 0℃
— TJ = +25℃
— TJ = +85℃
— TJ = +125℃
VIN = VEN = 3.8V
20 25
VIN = VEN = 3.8V
0.8
0
0.2
0.4
0.6
1
7
1
0
5
10
15
Output Current (A)
Output Current (mA)
Line Regulation
Line Regulation Under Light Loads
0.810
0.805
0.800
0.795
0.790
0.785
0.780
0.810
0.805
0.800
0.795
0.790
0.785
0.780
— TJ = -40℃
— TJ = 0℃
— TJ = -40℃
— TJ = 0℃
— TJ = +25℃
— TJ = +85℃
— TJ = +125℃
— TJ = +25℃
— TJ = +85℃
— TJ = +125℃
VOUT = 0.8V,
I
VOUT = 0.8V,
OUT = 5mA
I
OUT = 750mA
2.2
3
3.8
4.6
5.4
6.2
2.2
3
3.8
4.6
5.4
6.2
7
Input Voltage (V)
Input Voltage (V)
Dropout Voltage vs. Output Current
Ground Pin Current vs. Output Current
180
150
120
90
1200
1000
800
600
400
200
0
— TJ = -40℃
— TJ = 0℃
— TJ = -40℃
— TJ = 0℃
— TJ = +25℃
— TJ = +85℃
— TJ = +125℃
— TJ = +25℃
— TJ = +85℃
— TJ = +125℃
60
30
VOUT = 0.8V, VIN = 2.2V,
EN = 2V, IOUT = 10mA to 1A
VIN = 3.6V, VFB = 0V,
OUT = 0A to 1A
V
I
0
0
0.2
0.4
0.6
0.8
0
0.2
0.4
0.6
0.8
1
Output Current (A)
Output Current (A)
SG Micro Corp
www.sg-micro.com
OCTOBER 2022
9
1A, Low Noise, Wide Bandwidth,
SGM2048
High PSRR, Low Dropout Linear Regulator
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
TJ = +25℃, VIN = (VOUT(NOM) + 0.5V) or 2.2V (whichever is greater), VOUT(NOM) = 3.3V, VEN = VIN, IOUT = 100mA, CIN = COUT = 4.7µF,
CNR = 10nF, unless otherwise noted.
Current Limit vs. Temperature
Shutdown Current vs. Temperature
— VIN = 2.2V,
1.8
1.7
1.6
1.5
1.4
1.3
1.2
3.0
2.5
2.0
1.5
1.0
0.5
0.0
— VIN = 2.5V
— VIN = 3V
— VIN = 3.3V
— VIN = 5V
— VIN = 5.5V
— VIN = 6V
— VIN = 6.6V
— VIN = 7V
— VIN = 2.2V, VOUT = 0.8V
— VIN = 3.8V, VOUT = 3.3V
— VIN = 5.5V, VOUT = 5V
— VIN = 6.5V, VOUT = 6V
VOUT = 0.8V, VEN = 0.4V
20 35 50 65 80 95 110 125
Temperature (℃)
-40 -25 -10
5
20 35 50 65 80 95 110 125
-40 -25 -10
5
Temperature (℃)
Dropout Voltage vs. Temperature
Start-Up Time vs. Noise Reduction Capacitance
240
200
160
120
80
1000
100
10
— IOUT = 5mA
— IOUT = 750mA
— IOUT = 1A
1
40
VIN = 3.6V
VIN = 3.8V, RL = 1kΩ
0
0.1
-40 -25 -10
5
20 35 50 65 80 95 110 125
1
10
100
1000
Noise Reduction Capacitance (nF)
Temperature (℃)
SG Micro Corp
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OCTOBER 2022
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1A, Low Noise, Wide Bandwidth,
SGM2048
High PSRR, Low Dropout Linear Regulator
FUNCTIONAL BLOCK DIAGRAMS
SGM2048-ADJ
IN
OUT
FB
GND
Sub-Regulator
RDIS
R1
R2
Short-Circuit &
Thermal Protection
Voltage
Reference
NR
C1
S1
Shutdown
&
EN
Start-Up
Figure 2. Adjustable Output Voltage Internal Block Diagram
SGM2048-Fixed Output
IN
OUT
SNS
GND
Sub-Regulator
RDIS
R1
R2
Short-Circuit &
Thermal Protection
Voltage
Reference
NR
C1
S1
Shutdown
&
EN
Start-Up
Figure 3. Fixed Output Voltage Internal Block Diagram
SG Micro Corp
www.sg-micro.com
OCTOBER 2022
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1A, Low Noise, Wide Bandwidth,
SGM2048
High PSRR, Low Dropout Linear Regulator
APPLICATION INFORMATION
The SGM2048 is a low noise, high PSRR and fast
transient response LDO and provides 1A 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 SGM2048 useful in a
variety of applications. The SGM2048 provides the
protection function for output overload, output
short-circuit condition and overheating.
Dropout Voltage and VIN
The SGM2048 features low dropout voltage due to low
RDS(ON) PMOSFET power transistor. For Linear
regulator, when (VIN - VOUT) < dropout voltage (VDROP),
the PMOSFET power transistor will be turned on like a
switch, the parameter of linear regulator, such as
PSRR, load and input transient responses, will be
degraded so much. To get good performance in
application, the VIN must be larger than (VOUT + VDROP).
The SGM2048 provides an EN pin as an external chip
enable control to enable/disable the device. When the
regulator is in shutdown state, the shutdown current
consumes as low as 1μA (TYP).
Adjustable Regulator
The output voltage of the SGM2048-ADJ can be
adjusted from 0.8V to 6V. The FB pin will be connected
to two external resistors as shown in Figure 4. The
output voltage is determined by the following equation:
Input Capacitor Selection (CIN)
The input decoupling capacitor should be placed as
close as possible to the IN pin to ensure the device
stability. 10μF or larger X7R or X5R ceramic capacitor
is selected to get good dynamic performance.
R
1
VOUT = VFB × 1+
(1)
R2
where:
VOUT is output voltage and VFB is the internal voltage
reference, VFB = 0.8V.
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 keep it below the
device absolute maximum ratings.
VIN
IN
VOUT
OUT
ON
OFF
EN
R1
R2
SGM2048-ADJ
CIN
10μF
COUT
10μF
FB
NR
GND
CNR
10nF
Output Capacitor Selection (COUT
)
The output capacitor should be placed as close as
possible to the OUT pin. 10μF or larger X7R or X5R
ceramic capacitor is selected to get good dynamic
performance. The minimum effective capacitance of
COUT that SGM2048 can remain stable is 4.7μF. For
ceramic capacitor, temperature, DC bias and package
size will change the effective capacitance, so enough
margin of COUT must be considered in design.
Additionally, COUT with larger capacitance and lower
ESR will help increase the high frequency PSRR and
improve the load transient response.
Figure 4. Adjustable Output Voltage Application
R1 and R2 can be calculated for any output voltage
range using Equation 1. Choose R2 = 10kΩ to maintain
an 80μA minimum load.
Enable Control
The EN pin of the SGM2048 is used to enable/disable
the device and to deactivate/activate the output
automatic discharge function.
When the EN pin voltage is lower than VEN(L), the device
is in shutdown state. There is no current flowing from IN
to OUT pins. In this state, the automatic discharge
transistor is active to discharge the output voltage
through a 105Ω (TYP) resistor.
Noise-Reduction Capacitor (CNR)
A 10nF CNR is used to minimize the noise of LDO in
application. VREF, output resistor divider and error
amplifier are the dominant noise source of LDO in
application, but for the SGM2048, the VREF does not
contribute significantly to noise due to noise-reduction
capacitor CNR. On the contrary, the dominant noise
sources are the output resistor divider and the error
amplifier.
When the EN pin voltage is higher than VEN(H), the
device is in active state. The output voltage is regulated
to the expected value and the automatic discharge
transistor is turned off.
SG Micro Corp
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OCTOBER 2022
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1A, Low Noise, Wide Bandwidth,
SGM2048
High PSRR, Low Dropout Linear Regulator
APPLICATION INFORMATION (continued)
biased output is excessive and expected in the
Start-Up
application, a Schottky diode can be added between
the OUT pin and GND pin.
In Figure 2 and Figure 3, a low-pass (RC) filter is used
to reduce the noise of bandgap voltage reference, the
external CNR and the resistance controlled by the
quick-start circuit consists of this filter. The switch for
quick-start is closed at start-up, CNR will be charged by
VREF circuit and there is only 33kΩ resistance between
bandgap circuit output and the NR pin. It is about 2ms
after the device is enabled that the switch for quick-start
will be turned off, the resistance between the NR pin
and bandgap circuit output will be changed to about
265kΩ. This low-pass filter helps LDO achieve very
good noise-reduction after start-up due to resistance is
changed from 33kΩ to 265kΩ. Generally, low leakage
ceramic capacitor is used and the value of CNR is larger
than 10nF. Larger CNR is better to reduce the noise of
LDO, but it prolongs the start-up time of LDO, the value
of CNR must be the trade-off between noise and start-up
time.
Output Current Limit and Short-Circuit
Protection
When overload events happen, the output current is
internally limited to 1.6A (TYP). When the OUT pin is
shorted to ground, the short-circuit protection will limit
the output current to 1.6A (TYP).
Thermal Shutdown
The SGM2048 can detect the temperature of die. When
the die temperature exceeds the threshold value of
thermal shutdown, the SGM2048 will be in shutdown
state and remain in this state until the die temperature
decreases to +150℃.
Power Dissipation (PD)
Thermal protection limits power dissipation in the
SGM2048. When power dissipation on pass element
(PD = (VIN - VOUT) × IOUT) is too much and the operating
junction temperature exceeds +170℃, the OTP circuit
starts the thermal shutdown function and turns the pass
element off.
Under-Voltage Lockout (UVLO)
The UVLO circuit monitors the input voltage to prevent
the device from turning on before VIN rises above the
VUVLO threshold. The UVLO circuit responds quickly to
glitches on the IN pin and attempts to disable the output
of the device if any of these rails collapses. The local
input capacitance prevents severe brownouts in most
applications.
Therefore, thermal analysis for the chosen application is
important to guarantee reliable performance over all
conditions. To guarantee reliable operation, the junction
temperature of the SGM2048 must not exceed +125℃.
Minimum Load
The SGM2048 fixed voltage versions can remain stable
when there is no output load.
The maximum allowable power dissipation depends on
the thermal resistance of the IC package, the PCB
layout, the rate of surrounding airflow, and the
difference between the junction temperature and
ambient temperature. The maximum power dissipation
can be approximated using the following equation:
Input Power Supply
The input power supply range is from 2.2V to 7V. VIN
must be larger than (VOUT + VDROP) in application. The
input ceramic capacitor must be placed as close as
possible to the IN pin, this CIN can help improve the
output noise performance of LDO.
PD(MAX) = (TJ(MAX) - TA)/θJA
(2)
where TJ(MAX) is the maximum junction temperature, TA
is the ambient temperature, and θJA is the
junction-to-ambient thermal resistance.
Reverse Current Protection
The pass transistor has an inherent body diode which
will be forward biased in the case when VOUT > (VIN
0.3V). If extended reverse voltage operation is
anticipated, external limiting might be appropriate.
+
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.
Negatively Biased Output
When the output voltage is negative, the chip may not
start up due to parasitic effects. Ensure that the output
is greater than -0.3V under all conditions. If negatively
SG Micro Corp
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OCTOBER 2022
13
1A, Low Noise, Wide Bandwidth,
SGM2048
High PSRR, Low Dropout Linear Regulator
REVISION HISTORY
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
OCTOBER 2022 ‒ REV.A.2 to REV.A.3
Page
Updated Electrical Characteristics section...........................................................................................................................................................5
SEPTEMBER 2022 ‒ REV.A.1 to REV.A.2
Page
Updated Package Thermal Resistance................................................................................................................................................................3
MAY 2022 ‒ REV.A to REV.A.1
Page
Updated Application Information section............................................................................................................................................................13
Changes from Original (JANUARY 2022) to REV.A
Page
Changed from product preview to production data.............................................................................................................................................All
SG Micro Corp
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OCTOBER 2022
14
PACKAGE INFORMATION
PACKAGE OUTLINE DIMENSIONS
TDFN-3×3-8CL
D
e
N8
D1
E
e
E1
4 ×0.230
N1
PIN 1#
DETAIL A
b
L
BOTTOM VIEW
TOP VIEW
1.75
A
0.23
A1
A2
SIDE VIEW
0.65 1.5 2.8
0.825
0.6
0.31
ALTERNATE A-1
ALTERNATE A-2
0.65
DETAIL A
ALTERNATE TERMINAL
CONSTRUCTION
RECOMMENDED LAND PATTERN (Unit: mm)
Dimensions In Millimeters
MOD
Symbol
MIN
0.700
-
MAX
0.800
0.050
A
A1
A2
D
0.750
-
0.203 REF
3.000
2.950
1.700
2.950
1.450
0.250
3.050
1.800
3.050
1.550
0.350
D1
E
1.750
3.000
E1
b
1.500
0.300
e
0.650 BSC
0.400
L
0.350
0.450
NOTE: This drawing is subject to change without notice.
SG Micro Corp
TX00188.000
www.sg-micro.com
PACKAGE INFORMATION
TAPE AND REEL INFORMATION
REEL DIMENSIONS
TAPE DIMENSIONS
P2
P0
W
Q2
Q4
Q2
Q4
Q2
Q4
Q1
Q3
Q1
Q3
Q1
Q3
B0
Reel Diameter
P1
A0
K0
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 Width
Reel
Diameter
A0
B0
K0
P0
P1
P2
W
Pin1
Package Type
W1
(mm)
(mm) (mm) (mm) (mm) (mm) (mm) (mm) Quadrant
TDFN-3×3-8CL
13″
12.4
3.30
3.30
1.10
4.0
8.0
2.0
12.0
Q2
SG Micro Corp
TX10000.000
www.sg-micro.com
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)
Reel Type
Pizza/Carton
13″
386
280
370
5
SG Micro Corp
www.sg-micro.com
TX20000.000
相关型号：
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