SGM2523D [SGMICRO]
Programmable Current Limit Switch;
| 型号： | SGM2523D |
| 厂家： | 
Shengbang Microelectronics Co, Ltd |
| 描述： | Programmable Current Limit Switch |
| 文件： | 总16页 (文件大小：998K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SGM2523C/SGM2523D
Programmable Current Limit Switches
GENERAL DESCRIPTION
FEATURES
The SGM2523C/D are compact electronic fuses (eFuses)
with a complete set of protection functions. The wide
operating voltage range is specifically designed for
many popular DC buses. The devices provide ±10%
current limit accuracy which is suitable for a wide range
of system protection applications.
● Wide Input Voltage Range from 2.6V to 22V
with Surge up to 30V
● Low RDS(ON) for the Integrated Protection
Switch: 75mΩ
● Programmable Soft-Start Time
● Programmable Current Limit from 100mA to 1.2A
● ±10% Current Limit Accuracy at TJ = +25℃
● Short-Circuit Protection
The programmable soft-start time controls the slew rate
of the output voltage during the power-up procedure.
● OCP Hiccup Protections:
The devices protect input from undesired shorts and
transients coming from the output.
SGM2523C: Limited Current Mode
SGM2523D: Shutdown Mode
● Thermal Shutdown Options:
SGM2523C: Auto-Retry
The SGM2523C/D are available in a Green SOT-23-6
package and operate over a temperature range of
-40℃ to +125℃.
SGM2523D: Latch-Off
● Enable Interface Pin
● -40℃ to +125℃ Operating Temperature Range
● Available in a Green SOT-23-6 Package
APPLICATIONS
Hot Swap in Industry/Telecom
E-Meter
Automotive
USB Power Distribution
USB3.1 Power Delivery
Adapter Power Device
TYPICAL APPLICATION
1
IN
OUT
6
VIN
VOUT
0.1μF
2.2μF
2
5
4
1kΩ
GND
ILIM
SS
RILIM 95.3kΩ
(ILIMIT = 1A)
SGM2523C/D
EN/nFAULT
3
CSS
1.2nF
0.1μF
Figure 1. Typical Application Circuit
SG Micro Corp
NOVEMBER 2022 – REV. A. 1
www.sg-micro.com
SGM2523C
SGM2523D
Programmable Current Limit Switches
PACKAGE/ORDERING INFORMATION
SPECIFIED
TEMPERATURE
RANGE
PACKAGE
DESCRIPTION
ORDERING
NUMBER
PACKAGE
MARKING
PACKING
OPTION
MODEL
SGM2523C
SGM2523D
SOT-23-6
SOT-23-6
SGM2523CXN6G/TR
SGM2523DXN6G/TR
ON6XX
Tape and Reel, 3000
Tape and Reel, 3000
-40℃ to +125℃
-40℃ to +125℃
SGWXX
MARKING INFORMATION
NOTE: XX = Date Code.
YYY X X
Date Code - Week
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.
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, EN/nFAULT to GND............................ -0.3V to 26V
SS, ILIM to GND.................................................. -0.3V to 6V
Package Thermal Resistance
SOT-23-6, θJA .......................................................... 220℃/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.............................................................................4000V
CDM ............................................................................1000V
RECOMMENDED OPERATING CONDITIONS
Input Voltage Range............................................2.6V to 22V
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
NOVEMBER 2022
2
SGM2523C
SGM2523D
Programmable Current Limit Switches
PIN CONFIGURATION
(TOP VIEW)
IN
1
2
3
6
5
4
OUT
ILIM
SS
GND
EN/nFAULT
SOT-23-6
PIN DESCRIPTION
PIN
1
NAME
IN
FUNCTION
Power Input Pin. Decouple high frequency noise by connecting at least a 0.1μF ceramic capacitor to ground.
2
GND
Ground.
Enable Input or Alert Output (OTP, OCP, SCP). Asserting EN/nFAULT pin high enables the device. When any of
over-temperature protection, over-current protection, or short-circuit protection occurs, the device sinks current
from EN/nFAULT, pulling the pin down to alert the host (pin as output port).
Soft-Start Pin. The capacitor between SS and GND pins will set the slew rate according to the application
requirements.
3
4
EN/nFAULT
SS
Current Limit Program Pin. A resistor between ILIM and GND will set the overload and short-circuit current limit
levels. Do not float this pin.
5
6
ILIM
OUT
Power Output Pin.
FUNCTIONAL BLOCK DIAGRAM
6
IN
1
OUT
75mΩ
Current
Sense
OCP
SCP
OTP
Charge
Pump
I to V
3
EN/nFAULT
+
-
EN
1.39V
1.33V
nUVLO
SWEN
TSD
S
Q
R
+
-
ILIMIT
Retry Timer
(SGM2523C)
9.8μA
Gate
Control
5
ILIM
+
-
Fast-Trip
Comparator
1μA
+
SS
4
6.25x
-
IFAST-TRIP
nSWEN
2
GND
Figure 2. Functional Block Diagram
SG Micro Corp
www.sg-micro.com
NOVEMBER 2022
3
SGM2523C
SGM2523D
Programmable Current Limit Switches
ELECTRICAL CHARACTERISTICS
(TJ = -40℃ to +125℃, VIN = 2.6V to 22V, VEN/nFAULT = 2V, RILIM = 95.3kΩ, CSS = Open, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Supply Voltage and Internal Under-Voltage Lockout
Operating Input Voltage
VIN
VUVR
2.6
22
V
V
UVLO Threshold Voltage, Rising
UVLO Hysteresis
2.30
2.42
100
150
0.8
2.60
VUVHYS
IQ_ON
IQ_OFF
mV
µA
µA
Supply Current, Enabled
VEN/nFAULT = 2V, VIN = 12V
VEN/nFAULT = 0V, VIN = 12V
100
230
2
Supply Current, Disabled
Enable and Fault Flag (EN/nFAULT)
EN/nFAULT Threshold Voltage, Rising
EN/nFAULT Threshold Voltage, Falling
VENR
VENF
1.34
1.28
1.39
1.33
1.44
1.38
V
V
EN/nFAULT Threshold Voltage to Reset
Thermal Fault, Falling
VENF_RST
0.54
100
60
V
nA
Ω
EN/nFAULT Input Leakage Current
IEN/nFAULT VEN/nFAULT = 0V to 18V
Device in fault condition, VEN/nFAULT = 0V,
-100
15
0
EN/nFAULT Pull-Down Resistance
REN/nFAULT
29
IEN/nFAULT = 100mA
Soft-Start: Output Ramp Control (SS)
SS Charging Current
ISS
VSS = 0V
0.8
1
1.2
µA
SS to OUT Gain
GAINSS ΔVOUT/ΔVSS
6.10
6.25
6.40
V/V
Current Limit Programming (ILIM)
ILIM Pin Bias Current
IILIM
8.6
9.8
0.1
11
µA
A
R
ILIM = 10kΩ
RILIM = 35.7kΩ
0.23
0.31
0.93
0.90
0.37
0.48
1
0.51
0.64
1.07
1.10
Current Limit
ILIMIT
RILIM = 45.3kΩ
RILIM = 95.3kΩ, TJ = +25℃
RILIM = 95.3kΩ
1
Fast-Trip Comparator Threshold
ILIM Open Resistor Detect Threshold
MOSFET-Power Switch
IFAST-TRIP RILIM in kΩ
2 × ILIMIT
3.0
A
V
VILIM_OPEN VILIM rising, RILIM = Open, VIN = 5V to 22V
2.6
40
3.4
FET On-Resistance
RDS(ON)
75
125
mΩ
Pass FET Output (OUT)
VEN/nFAULT = 0V, VOUT = 0V (Sourcing),
ILKG_OUT
-0.5
-0.5
0.1
0.2
0.5
0.5
TJ = -40℃ to +85℃
VEN/nFAULT = 0V, VOUT = 300mV (Sinking),
OUT Bias Current in Off State
µA
ISINK_OUT
TJ = -40℃ to +85℃
Thermal Shutdown (TSD)
Thermal Shutdown Threshold, Rising
Thermal Shutdown Hysteresis
TTSD
155
20
℃
℃
TTSDHYS
SG Micro Corp
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NOVEMBER 2022
4
SGM2523C
SGM2523D
Programmable Current Limit Switches
TIMING REQUIREMENTS
(TJ = +25℃, VIN = 12V, VEN/nFAULT = 2V, RILIM = 95.3kΩ, CSS = Open, unless otherwise noted.)
PARAMETER
Enable and Fault Flag (EN/nFAULT)
Turn-On Delay
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
tON_DLY
EN/nFAULT↑ to VOUT = 1V, COUT = 2.2µF
EN/nFAULT↓ to VOUT = 10.8V, COUT = 2.2µF
75
90
µs
µs
Turn-Off Delay
tOFF_DLY
Soft-Start: Output Ramp Control (SS)
EN/nFAULT↑ to VOUT = 11V, with CSS
open, COUT = 2.2µF
EN/nFAULT↑ to VOUT = 11V, with CSS
1.2nF, COUT = 2.2µF
=
0.10
1.60
0.38
2.07
0.70
2.70
Output Ramp Time
tSS
ms
=
Current Limit Programming (ILIM)
Fast-Trip Comparator Delay
Thermal Shutdown (TSD)
tFAST-TRIP_DLY IOUT > IFAST-TRIP
0.3
µs
SGM2523C only, VIN = 12V
SGM2523C only, VIN = 2.6V
700
750
Retry Delay after Thermal Shutdown
tTSD_DLY
ms
Recovery, TJ < [TTSD - 20℃]
PARAMETRIC MEASUREMENT INFORMATION
2V
90%
VEN/nFAULT
10%
tOFF_DLY
0V
tON_DLY
12V
0V
90%
VOUT
1V
Figure 3. tON_DLY and tOFF_DLY Waveforms
IFAST-TRIP
ILIMIT
IIN
tFAST-TRIP_DLY
Figure 4. tOVP_DLY Waveforms
SG Micro Corp
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NOVEMBER 2022
5
SGM2523C
SGM2523D
Programmable Current Limit Switches
TYPICAL PERFORMANCE CHARACTERISTICS
TJ = +25℃, VIN = 2.6V to 22V, VEN/nFAULT = 2V, RILIM = 95.3kΩ, CSS = Open, unless otherwise noted.
Input Supply Current vs. Supply Voltage
Input Supply Current vs. Supply Voltage at Shutdown
during Normal Operation
0.22
0.19
0.16
0.13
0.10
0.07
2.5
2.0
1.5
1.0
0.5
0.0
+125℃
+125℃
+85℃
+85℃
+25℃
-40℃
+25℃
-40℃
0
3
6
9
12
15
18
21
24
0
3
6
9
12
15
18
21
24
Supply Voltage (V)
Supply Voltage (V)
UVLO Threshold Voltage vs. Temperature
EN/nFAULT Threshold Voltage to Reset Fault Latch vs. Temperature
1.0
2.6
2.5
2.4
2.3
2.2
2.1
0.9
0.8
0.7
0.6
0.5
VUVR
VUVF
-50 -25
0
25
50
75 100 125 150
-50 -25
0
25
50
75 100 125 150
Temperature (℃)
Temperature (℃)
SS Pin Charging Current vs. Temperature
GAINSS vs. Temperature
1.04
1.02
1.00
0.98
0.96
0.94
6.5
6.4
6.3
6.2
6.1
6.0
-50 -25
0
25
50
75 100 125 150
-50 -25
0
25
50
75 100 125 150
Temperature (℃)
Temperature (℃)
SG Micro Corp
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NOVEMBER 2022
6
SGM2523C
SGM2523D
Programmable Current Limit Switches
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
TJ = +25℃, VIN = 2.6V to 22V, VEN/nFAULT = 2V, RILIM = 95.3kΩ, CSS = Open, unless otherwise noted.
Output Ramp Time vs. Soft-Start Capacitor
Output Ramp Time vs. Temperature
1000
100
10
0.40
0.38
0.36
0.34
0.32
0.30
TJ = -40℃
TJ = +25℃
TJ = +85℃
1
1
10
100
-50 -25
-50 -25
-50 -25
0
25
50
75 100 125 150
Soft-Start Capacitor (nF)
Temperature (℃)
Current Limit vs. Current Limit Resistor
Current Limit vs. Temperature
1.5
1.2
0.9
0.6
0.3
0.0
1.5
1.2
0.9
0.6
0.3
0.0
RILIM = 95.3kΩ
RILIM = 45.3kΩ
RILIM = 35.7kΩ
0
15
30
45
60
75
90 105 120
0
25
50
75 100 125 150
Current Limit Resistor (kΩ)
Temperature (℃)
Current Limit vs. Temperature
On-Resistance vs. Temperature
0.26
0.25
0.24
0.23
0.22
0.21
140
120
100
80
RILIM = Short
60
40
-50 -25
0
25
50
75 100 125 150
0
25
50
75 100 125 150
Temperature (℃)
Temperature (℃)
SG Micro Corp
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NOVEMBER 2022
7
SGM2523C
SGM2523D
Programmable Current Limit Switches
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
TJ = +25℃, VIN = 2.6V to 22V, VEN/nFAULT = 2V, RILIM = 95.3kΩ, CSS = Open, unless otherwise noted.
Current Limit Accuracy vs. Current Limit
TC (TOP) vs. ILOAD
50
40
30
20
10
0
60
50
40
30
20
10
SGM2523C
0.2
0.4
0.6
0.8
1.0
1.2
1.4
0.1
0.3
0.5
0.7
0.9
1.1
1.3
Current Limit (A)
ILOAD (A)
Turn-On with Enable
Turn-On with Enable
VEN/nFAULT
VEN/nFAULT
VOUT
VOUT
VIN
VIN
COUT = 2.2μF, CSS = Open
COUT = 2.2μF, CSS = 1.2nF
Time (100μs/div)
Time (500μs/div)
Hot-Short: Fast-Trip Response and Current
Regulation
Hot-Short: Fast-Trip Response (Zoomed)
VEN/nFAULT
VOUT
VEN/nFAULT
VOUT
VIN
VIN
IIN
IIN
Time (50μs/div)
Time (200ns/div)
SG Micro Corp
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NOVEMBER 2022
8
SGM2523C
SGM2523D
Programmable Current Limit Switches
DETAILED DESCRIPTION
The device implements the input UVLO and sets two
Overview
UVLOs in combination with EN/nFAULT. If VEN/nFAULT
<
The SGM2523C/D are 6-pin, 2.6V to 22V eFuses with
thermal shutdown. To reduce voltage drop for low
voltage and high current rails, the device implements a
low on-resistance N-MOSFET which reduces the
dropout voltage across the device.
VENF, the device is disabled and EN/nFAULT can set
the VIN rise threshold, so the device can set the section
active voltage to avoid the input rail fluctuation.
When the switching voltage of the devices is more than
15V, a Zener diode of no more than 27V (> 0.5W)
should be added to prevent the input voltage spike from
damaging the device (as shown in Figure 5).
The configurable rise time of the device greatly reduces
inrush current caused by large bulk load capacitances
or hot-plug boards, thereby the power supply droop will
be reduced or eliminated. The current limit threshold
can be programmed between 0.1A and 1.2A through
an external resistor.
EN/nFAULT as Output Port
When any of over-current protection or over-temperature
protection occurs, the device sinks current from
EN/nFAULT, pulling the pin down to alert the host.
When the output load exceeds the current limit
threshold or a short-circuit event is present, the device
limits the output current to a safe level by increasing the
on-resistance of the power switch. Continuous heavy
overloads and short-circuits that increase power
dissipation of the switch can cause the junction
temperature to rise, in which case thermal protection
circuit will shut off the switch to prevent damage.
EN/nFAULT changes back to an input port, only after
the device is released from a protection action.
DO
EN/nFAULT
DI
Delay
UVLO
On
A typical MCU IO block
Logic
Control
Enable and Adjusting Under-Voltage
Lockout (UVLO)
OCP
SCP
OTP
P
The EN/nFAULT pin can control the state of the switch.
Pulling the EN/nFAULT pin high enables the device.
Logic high of VENR on the EN/nFAULT pin will enable
the device and VENF will turn it off.
GND
Internal Control Logic
Figure 6. EN/nFAULT Application
IN
VIN
R1
Inrush Current Control
The SGM2523C/D are designed to control the inrush
current when the devices are enable or power-on. The
capacitor between SS and GND pins will set the slew
rate according to the application requirements. An
approximate formula for the relationship between CSS
and slew rate is shown in Equation 1:
< 27V
Zener
Diode
EN/nFAULT
+
-
EN
1.39V
1.33V
R2
GND
SGM2523C/D
CSS
dVOUT
ISS
=
×
(1)
Figure 5. UVLO Thresholds Set by R1 and R2
GAINSS
dt
where:
SS = 1μA (TYP)
dVOUT/dt = Target output slew rate
As shown in Figure 5, the under-voltage locking
threshold is programmed by an external resistor divider
(R1 and R2) from the power input terminal to the
EN/nFAULT terminal to the GND.
I
GAINSS = ΔVOUT/ΔVSS = 6.25
C
SS (MAX) must be less than 1μF.
Once the input rails under-voltage, the N-MOSFET will
be turned off quickly. If this function is not needed,
connect the EN/nFAULT pin to the VIN rail to avoid it
happens. Do not leave the EN/nFAULT pin floating.
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NOVEMBER 2022
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SGM2523C
SGM2523D
Programmable Current Limit Switches
DETAILED DESCRIPTION (continued)
into current limit action, and the value of the current
limit (ILIMIT) is set by RILIM resistor:
1μA
LIMIT = 10.5 × 10-3 × RILIM
ILIMIT
(4)
(5)
SS
I
RILIM
=
CSS
CINT
10.5×10−3
nSWEN
GND
where:
ILIMIT is overload current limit in A.
ILIM is the current limit programming resistor in kΩ.
SGM2523C/D
R
In addition to the general over-current protection, the
SGM2523C/D also integrate fast-trip over-current
protection with quicker response time.
Figure 7. Output Ramp Time is Set by CSS
Equation 2 shows how to calculate the total output
ramp time (tSS) when the output rises from 0V to VIN:
Overload Protection
Once an overload occurs, the internal current limit
amplifier limits the output current to the predetermined
value by increasing the on-resistance of the power
switch.
tSS = 16.1 × 104 × VIN × CSS
(2)
where CSS is in F.
Inrush current can be calculated by the following
formula.
During current limit regulation, the output voltage drops,
resulting in increased power consumption. The
SGM2523C/D allow ILIM pin floating operation. If ILIM
pin is floating, the current limit will be set as fixed 0.2A
internally.
V
IN
I
= COUT
×
(3)
INRUSH
tSS
Rise time can be calculated by multiplying the input
voltage by the slew rate. If floating this pin, the slew
rate of the output obtains a default value ~50V/ms
(minimum tSS).
When the over-current limit condition lasts more than
2ms, the SGM2523C enters the hiccup mode with 2ms
on time and 700ms off time, whereas the SGM2523D
enters shutdown mode.
Power SOA
30
TJ = +25℃
Short-Circuit Protection
A transient short-circuit occurs, due to the limited
bandwidth of the current limit amplifier, which cannot
respond quickly to this event. The SGM2523C/D
25
RILIM = 60kΩ
20
RILIM = 100kΩ
15
10
5
contain
a fast-trip comparator with a threshold
(IFAST-TRIP). If IOUT > IFAST-TRIP, the comparator turns off
the N-MOSFET and terminates the short-circuit peak
current across the N-MOSFET rapidly. The fast-trip
threshold is 2 times the overload current limit. The
fast-trip comparator can terminate the transient
short-circuit peak current, and then the current limit
0
20
30
40
50
60
70
80
90 100
CSS (nF)
function limits the output current to ILIMIT
.
IFAST-TRIP = 2 × ILIMIT
(6)
Figure 8. Power SOA
where:
IFAST-TRIP is the fast-trip current limit threshold, which is
measured in A.
Over-Current and Short-Circuit Protections
The device limits current to the output in case of output
shorts and overloads. If an event occurs, device goes
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SGM2523C
SGM2523D
Programmable Current Limit Switches
DETAILED DESCRIPTION (continued)
After the fast-trip is triggered, the fast-trip circuit will first
make the FET turn off for several microseconds, and
then the device enters the current limit start-up period,
where the output current is limited to ILIMIT. After this
period, the behavior of the device is the same as that of
over-current.
Thermal Shutdown
Thermal shutdown protects the device from excessive
temperature. Once the device is shut down due to TSD
fault, it will either stay latch-off (SGM2523D) or restart
automatically after TJ drops below [TTSD - 20 ℃ ]
(SGM2523C). When over-temperature protection is
triggered, the EN/nFAULT pin is pulled low to indicate
the fault signal.
IFAST-TRIP
IFAST-TRIP = 2 × ILIMIT
Shutdown Control
ILIMIT
By keeping the EN/nFAULT pin below its VENF threshold,
the internal FET and load current can be turned off
remotely.
Figure 9. Over-Current Protection Levels
Operational Overview
The device function is shown in Table 1.
Start-Up and IOUT
During the power-up, the IOUT is equal to the smaller
one of Equation 3 and Equation 4.
Table 1. Device Functions
Device
SGM2523C and SGM2523D
Inrush ramp controlled by SS pin via an external
capacitor.
IN, OUT and GND
Start-Up
Limit inrush current to ILIMIT level.
If TJ > TTSD, device shuts off.
To limit the voltage drop on the input supply caused by
transient inrush current when the switch turns on into a
discharged load capacitor, a capacitor needs to be
placed between IN and GND pins. Use a bypass
capacitor as close as possible between IN and GND
pins. Due to the integrated body diode in the
N-MOSFET, it is highly recommended that CIN should
be greater than COUT. When the system power supply is
removed, if COUT is greater than CIN, it will cause VOUT to
exceed VIN.
Current is limited to ILIMIT level.
Power dissipation increases as VIN - VOUT grows.
TJ > TTSD, the device is turned off.
Over-Current
Response
SGM2523C will attempt restart tTSD_DLY ms after TJ <
[TTSD -20°C].
SGM2523D remains off.
Fast shut off when ILOAD > IFAST-TRIP.
Short-Circuit
Response
Quick restart and current limited to ILIMIT, follows
standard start-up cycle.
This will result in current flow through the body diode
from VOUT to VIN. A CIN to COUT ratio of 10 to 1 is
recommended for minimizing VIN dip caused by inrush
currents during start-up. VOUT in the on state can be
calculated as Equation 7:
The SGM2523C/D provide a complete set of protection
functions for overload or inrush current. The wide
operating voltage range (2.6V to 22V) is specifically
designed for many popular DC buses, and the
maximum load current of 1.2A can meet the power
delivery requirements of many devices.
VOUT = VIN - (RDS(ON) × IOUT
)
(7)
where RDS(ON) is the resistance of the FET during
on-state.
GND terminal is the ground pin, which is the most
negative voltage in the chip. GND is the negative
terminal of all other terminals unless otherwise
specified.
SG Micro Corp
www.sg-micro.com
NOVEMBER 2022
11
SGM2523C
SGM2523D
Programmable Current Limit Switches
APPLICATION INFORMATION
During short-circuit fault, the internal fast comparator
shuts down the FET within 0.3μs after the input current
increases rapidly and exceeds IFAST-TRIP which is set by
the external RILIM resistor.
Protection and Current Limit for AC/DC
Power Supplies
In many small household appliances, portable devices,
consumer products and other application scenarios, the
primary-side power supplies and adapter are dominant.
These power supplies generally have a rated power of
5W - 30W, which is generally characterized by high
efficiency, low cost and few components. However,
there are also the following shortcomings:
Furthermore, the SGM2523C/D provide inrush current
limit during the output ramp up procedure.
Precision Current Limit in Intrinsic Safety
Applications
• No secondary-side protection which can stop short-
circuit and other key faults immediately.
• Cannot provide precision current limit for overload
transients.
• Poor ability to regulate the output voltage during
sudden fluctuation of the AC input voltage, when the
output over-voltage condition is triggered.
The safe operation of electrical and electronic
equipment in dangerous area environment has a more
and more urgent requirements for intensive safety (IS).
IS requires that the total energy available during
equipment operation is not enough to ignite the
surrounding explosive environment by means of
electric sparks or heat transfer. This requires precision
current limits to ensure that the set current limits are not
exceeded over a wide operating temperature range and
variable environmental conditions. Applications such as
gas analyzers, medical devices, portal industrial
equipment, etc., need to meet these importance safety
standards. As a simple over-voltage and over-load
protection solution, SGM2523C/D are applicable to
each power rail inside the system application. The
typical implementation circuit of SGM2523C/D is shown
in Figure 11.
Therefore, accurate current sensing and overload
protection are required for the secondary side output
port in the above applications. This requires the use of
precision operational amplifiers for additional circuit
implementation. It adds complexity to the solution and
leads to a loss of sensing. The SGM2523C/D adopting
N-MOSFET with low on-resistance is a simple and
efficient solution. The typical application circuit of
SGM2523C/D is shown in Figure 10.
VOUT
SGM2523C/D
ILIM
CB2
CB1
NP
NS
CO
+
-
RILIM
VAC
UVV287XX
Primary Regulator
Fly-Back Controller
RS
Figure 10. Current Limit and Protection for AC/DC Power Supplies
LO
Sync Buck
DC/DC
VOUT
VOUT
VIN
VIN
SGM2523C/D
LDO
SGM2523C/D
Converter
ILIM
ILIM
CB
CB
CO
CO
RILIM
RILIM
Figure 11. Precision Current Limit and Protection of Internal Rails
SG Micro Corp
www.sg-micro.com
NOVEMBER 2022
12
SGM2523C
SGM2523D
Programmable Current Limit Switches
APPLICATION INFORMATION (continued)
current limits, programmable soft-start, over-temperature
Smart Load Switch
protection, fault flag and under-voltage lockout are provided
in the SGM2523C/D.
The smart load switch is a series of MOSFETs used to
switch the load (resistance or inductance). It also
provides protection in case of failure. Figure 12 shows
a typical discrete implementation of load switch, which
requires more components and more complex circuits
to achieve fault protection. The SGM2523C/D can be
used as a load switch for the applications whose
operating range is from 2.6V to 22V. Programmable
Used as a load switch, Figure 12 shows a typical
implementation of SGM2523C/D, which is used for
driving a solenoid and fan control. Freewheeling diode
is recommended for the highly inductive load.
VIN
Enable
EN/nFAULT
Load
VIN
CS
SGM2523C/D
R1
Over-Current
Protection
UVLO
ILIM
R2
Q1 Disable
RILIM
Q1
Figure 12. Smart Load Switch Implementation
REVISION HISTORY
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
NOVEMBER 2022 ‒ REV.A to REV.A.1
Page
Updated Detailed Description section...................................................................................................................................................... 9, 10, 11
Changes from Original (MARCH 2021) to REV.A
Page
Changed from product preview to production data.............................................................................................................................................All
SG Micro Corp
www.sg-micro.com
NOVEMBER 2022
13
PACKAGE INFORMATION
PACKAGE OUTLINE DIMENSIONS
SOT-23-6
D
e1
e
E1
E
2.59
0.99
b
0.95
0.69
RECOMMENDED LAND PATTERN (Unit: mm)
L
A
A1
c
θ
A2
0.2
Dimensions
In Millimeters
Dimensions
In Inches
Symbol
MIN
MAX
MIN
MAX
0.049
0.004
0.045
0.020
0.008
0.119
0.067
0.116
A
A1
A2
b
1.050
0.000
1.050
0.300
0.100
2.820
1.500
2.650
1.250
0.100
1.150
0.500
0.200
3.020
1.700
2.950
0.041
0.000
0.041
0.012
0.004
0.111
0.059
0.104
c
D
E
E1
e
0.950 BSC
1.900 BSC
0.037 BSC
0.075 BSC
e1
L
0.300
0°
0.600
8°
0.012
0°
0.024
8°
θ
NOTES:
1. Body dimensions do not include mode flash or protrusion.
2. This drawing is subject to change without notice.
SG Micro Corp
TX00034.000
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
SOT-23-6
7″
9.5
3.23
3.17
1.37
4.0
4.0
2.0
8.0
Q3
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
7″ (Option)
7″
368
442
227
410
224
224
8
18
SG Micro Corp
www.sg-micro.com
TX20000.000
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