SGM61220
4.5V to 28V Input, 2A Output,
Synchronous Buck Converter
GENERAL DESCRIPTION
FEATURES
The SGM61220 is a synchronous Buck converter with a
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Wide 4.5V to 28V Input Voltage Range
2A Continuous Output Current
Integrated 66mΩ/36mΩ Power MOSFETs
Low Quiescent Current: 25μA (TYP)
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Shutdown Current: 2μA (TYP)
5ms Internal Soft-Start Time
Fixed 410kHz Switching Frequency
Pulse Skip Mode and PWM Mode
Peak Current Mode Control
Internal Loop Compensation
Over-Current Protection for Both MOSFETs
Output Over-Voltage Protection
Adjustable Input Under-Voltage Lockout
Thermal Shutdown with Auto Recovery
Available in a Green TSOT-23-6 Package
wide input voltage range of 4.5V to 28V. This device can
deliver up to 3A to the output over a wide input voltage.
It is an easy-to-use device with power switches and peak
current mode control compensation all integrated in a
small 6-pin package. A typical 5ms soft-start ramp is also
included to minimize the inrush current.
This device employs cycle-by-cycle peak current limit,
output over-voltage protection and thermal shutdown
with auto recovery. The current limit is implemented for
both switches and has foldback feature to prevent
overheating (and thermal shutdown) when an output short
is detected. Auto recovery after over-current, output short,
overheating or over-voltage fault maintains the system
operational with no shutdown.
This converter has a fixed 410kHz switching frequency
that minimizes the EMI noise problems. However the
actual frequency drops during PSM (pulse skip mode)
to maximize efficiency at light load. It also drops in
APPLICATIONS
12V Distributed Power Supply Buses
Industrial and Consumer Applications
some fault conditions.
White Goods
The SGM61220 is available in a Green TSOT-23-6
package.
Set Top Boxes
Audio Equipment
Digital Television Printers
TYPICAL APPLICATION
BOOT
VIN
VIN
CBOOT
CIN
SW
SGM61220
EN
VOUT
L
COUT
RFB1
FB
GND
RFB2
Figure 1. Typical Application Circuit
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APRIL 2022 – REV. A. 1
4.5V to 28V Input, 2A Output,
Synchronous Buck Converter
SGM61220
PACKAGE/ORDERING INFORMATION
MODEL
PACKAGE
DESCRIPTION
SPECIFIED
TEMPERATURE
RANGE
ORDERING
NUMBER
PACKAGE
MARKING
PACKING
OPTION
SGM61220
TSOT-23-6
-40℃ to +125℃
SGM61220XTN6G/TR
R47XX
Tape and Reel, 3000
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.
ABSOLUTE MAXIMUM RATINGS
Input Voltage Range .......................................... -0.3V to 30V
EN and BOOT-SW Voltages ................................ -0.3V to 6V
SW Voltage ........................................................ -0.3V to 30V
SW (20ns transient) Voltage ................................. -5V to 30V
FB Voltage ........................................................ -0.3V to 3.5V
Package Thermal Resistance
TSOT-23-6, θJA ........................................................ 123℃/W
RθJC(TOP) ................................................................... 45℃/W
Junction Temperature .................................................+150℃
Storage Temperature Range ....................... -65℃ to +150℃
Lead Temperature (Soldering, 10s) ............................+260℃
ESD Susceptibility
HBM ............................................................................. 2000V
CDM ............................................................................ 1500V
RECOMMENDED OPERATING CONDITIONS
Input Voltage Range ............................................4.5V to 28V
EN and BOOT-SW Voltages ............................. -0.1V to 5.5V
SW Voltage ........................................................ -0.1V to 28V
FB Voltage ........................................................... -0.1V to 3V
Operating Junction Temperature Range ...... -40℃ to +125℃
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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 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.
DISCLAIMER
SG Micro Corp reserves the right to make any change in
circuit design, or specifications without prior notice.
APRIL 2022
2
4.5V to 28V Input, 2A Output,
Synchronous Buck Converter
SGM61220
PIN CONFIGURATION
(TOP VIEW)
GND
1
6
BOOT
SW
2
5
EN
VIN
3
4
FB
TSOT-23-6
PIN DESCRIPTION
PIN
NAME
TYPE
1
GND
–
Device Ground Reference Pin.
2
SW
O
Switching Node. Connection point of the internal converter lower and upper power MOSFETs.
Connect this pin to the output inductor and the bootstrap capacitor.
3
VIN
–
4
FB
I
5
EN
I
6
BOOT
O
DESCRIPTION
Input Supply Voltage Pin. VIN powers the internal control circuitry and the power converter.
Decouple this pin for very high frequency and high di/dt transitions, with small and high
frequency ceramic capacitors placed as close as possible between VIN and GND pins. Input
under-voltage is protected by a UVLO comparator.
Feedback (Sense) Pin for Output Voltage and Programming. It is normally regulated at
0.603V. Tap an output feedback resistor divider to this pin.
Device Enable Pin. Device will operate if EN voltage is high and will shut down if it is low.
Device will be enabled if this pin is left float. EN pin can be used to increase the UVLO
thresholds.
Bootstrap Pin. Place a 0.1µF capacitor (CBOOT) between BOOT and SW pins close to the
device to provide the required drive voltage for the high-side switch. Do not place any series
resistor with CBOOT.
NOTE: O = Output, I = Input.
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APRIL 2022
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4.5V to 28V Input, 2A Output,
Synchronous Buck Converter
SGM61220
ELECTRICAL CHARACTERISTICS
(TJ = -40℃ to +125℃, VIN = 4.5V to 28V, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
VIN
Non-Switching Quiescent Current
IQ
VEN = 5V, VFB = 1V
25
µA
Shutdown Supply Current
ISD
EN = GND
2
µA
VIH
Rising
VIL
Falling
IIL
VEN = 0.5V
0.45
IIH
VEN = 1.5V
1.44
VFB
VIN = 12V, TJ = +25℃
EN Terminal Leakage Current
28
UNITS
Input Voltage Range
EN Terminal Input Threshold
4.5
MAX
1.19
0.93
1.33
1.10
V
V
μA
Feedback and Error Amplifier
Feedback Voltage
0.585
0.603
0.620
V
Power Stage
High-side FET On-Resistance
RDSON_HS
VBOOT - VSW = 5V
66
116
mΩ
Low-side FET On-Resistance
RDSON_LS
VIN = 12V
36
63
mΩ
3.8
4.5
A
Current Limit
High-side Current Limit
ILIM_HS
Maximum inductor peak current, TJ = +25℃
Low-side Current Limit
ILIM_LS
Maximum inductor valley current, TJ = +25℃
3.2
2.2
A
Input Under-Voltage Lockout
UVLO Threshold Voltage
UVLO Hysteresis
VUVLO
4.1
Rising VIN
Falling VIN
3.4
VUVLO_HYS
4.5
3.7
V
400
mV
165
℃
10
℃
Over-Temperature Protection
Thermal Shutdown
TSHDN
Thermal Shutdown Hysteresis
THYS
Rising temperature
Oscillator
Switching Frequency
fSW
340
410
480
kHz
Timing Requirements
Soft-Start Time
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tSS
5
ms
APRIL 2022
4
4.5V to 28V Input, 2A Output,
Synchronous Buck Converter
SGM61220
TYPICAL PERFORMANCE CHARACTERISTICS
TJ = +25℃, VIN = 4.5V to 28V, unless otherwise noted.
Quiescent Current vs. Junction Temperature
60
Shutdown Current vs. Junction Temperature
6
VIN = 12V
5
Shutdown Current (μA)
Quiesecent Current (μA)
50
VIN = 12V
40
30
20
10
4
3
2
1
0
0
-50
-25
0
25
50
75
100
125
150
-50
-25
Junction Temperature (℃)
VIN = 12V
120
120
100
100
RDSON_LS (mΩ)
75
100
125
150
80
60
125
150
VIN = 12V
80
60
40
40
20
20
0
-50
-25
0
25
50
75
100
125
150
-50
Junction Temperature (℃)
Efficiency vs. Output Current
Percentage of Converters (%)
90
80
70
60
50
40
30
VIN = 12V
VIN = 24V
VOUT = 5.0V
0
0.001
0.01
0.1
Output Current (A)
1
25
50
75
100
Feedback Voltage Production Distribution
25
10
0
Junction Temperature (℃)
100
20
-25
10
20
12660 Samples
1 Production Lot
15
10
5
0
0.593
0.594
0.595
0.596
0.597
0.598
0.599
0.600
0.601
0.602
0.603
0.604
0.605
0.606
0.607
0.608
0.609
0.610
0.611
RDSON_HS (mΩ)
50
RDSON_LS vs. Junction Temperature
140
0
Efficiency (%)
25
Junction Temperature (℃)
RDSON_HS vs. Junction Temperature
140
0
VFB (V)
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APRIL 2022
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4.5V to 28V Input, 2A Output,
Synchronous Buck Converter
SGM61220
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
TJ = +25℃, VIN = 4.5V to 28V, unless otherwise noted.
Load Regulation
0.5
0.4
0.4
0.3
0.3
Load Regulation (%)
Line Regulation (%)
Line Regulation
0.5
0.2
0.1
0.0
-0.1
-0.2
-0.3
-0.4
0.2
0.1
0.0
-0.1
-0.2
-0.3
VIN = 12V
VIN = 24V
-0.4
-0.5
-0.5
6
8
10 12 14 16 18 20 22 24 26 28
0.0
0.5
Input Voltage (V)
Switching Frequency vs. Ambient Temperature
VIN = 12V
430
2.0
VIN = 12V
0.606
420
410
400
390
380
0.604
0.602
0.600
0.598
0.596
-50
-25
0
25
50
75
100
125
150
-50
-25
Ambient Temperature (℃)
4.3
1.5
EN Terminal Input Threshold (V)
1.6
Rising VIN
4.1
4.0
3.9
Falling VIN
3.8
25
50
75
100
125
150
EN Terminal Input Threshold vs. Junction Temperature
4.4
4.2
0
Ambient Temperature (℃)
UVLO Threshold Voltage vs. Junction Temperature
UVLO Threshold Voltage (V)
1.5
Feedback Voltage vs. Ambient Temperature
0.608
Feedback Voltage (V)
Switching Frequency (kHz)
440
1.0
Output Current (A)
3.7
3.6
VIN = 28V
1.4
1.3
VIH
1.2
1.1
VIL
1.0
0.9
0.8
-50
-25
0
25
50
75
100
Junction Temperature (℃)
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125
150
-50
-25
0
25
50
75
100
125
150
Junction Temperature (℃)
APRIL 2022
6
4.5V to 28V Input, 2A Output,
Synchronous Buck Converter
SGM61220
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
TJ = +25℃, VIN = 24V, VOUT = 5V, CIN = 10μF, COUT = 2 × 22μF, unless otherwise noted.
Power On
Power Off
RLOAD = 500Ω
RLOAD = 500Ω
10V/div
VIN
10V/div
VIN
2V/div
VOUT
2V/div
VOUT
Time (5ms/div)
Time (50ms/div)
Turn On
Turn Off
RLOAD = 500Ω
RLOAD = 500Ω
2V/div
VIN
EN
2V/div
2V/div
EN
10V/div
10V/div
VIN
VOUT
2V/div
VOUT
Time (2ms/div)
Time (10ms/div)
Load Transient Response
Load Transient Response
IOUT = 0.1A to 1.0A, 0.25A/μs
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1A/div
Time (200μs/div)
IOUT
AC Coupled
100mV/div
IOUT
VOUT
500mA/div
AC Coupled
100mV/div
VOUT
IOUT = 0.75A to 1.75A, 0.25A/μs
Time (200μs/div)
APRIL 2022
7
4.5V to 28V Input, 2A Output,
Synchronous Buck Converter
SGM61220
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
TJ = +25℃, VIN = 24V, VOUT = 5V, CIN = 10μF, COUT = 2 × 22μF, unless otherwise noted.
Input Voltage Ripple
Output Voltage Ripple
EN = Floating, IOUT = 600mA
VSW
AC Coupled
10V/div
Time (2μs/div)
Time (4ms/div)
Output Voltage Ripple
Output Voltage Ripple
EN = Floating, IOUT = 10mA
Time (40μs/div)
AC Coupled
10V/div
VSW
20mV/div
VSW
VOUT
10V/div
AC Coupled
EN = Floating, IOUT = 100mA
20mV/div
VOUT
20mV/div
VSW
VOUT
10V/div
VIN
EN = Floating, IOUT = 0mA
200mV/div
AC Coupled
Time (4μs/div)
Output Voltage Ripple
EN = Floating, IOUT = 1.5A
20mV/div
VOUT
AC Coupled
10V/div
VSW
Time (2μs/div)
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APRIL 2022
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4.5V to 28V Input, 2A Output,
Synchronous Buck Converter
SGM61220
FUNCTIONAL BLOCK DIAGRAM
VIN
OV
Voltage
Reference
+
-
FB
Soft-Start
HS Current
Sensor
Thermal
Sensor
UVLO
HS Current
Comparator and
Limit
Slope
Compensation
BOOT
Boot Regulator
HS Driver
SW
Control Logic
Oscillator
EN
LS Driver
LS Current Limit
SGM61220
GND
Figure 2. Block Diagram
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APRIL 2022
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SGM61220
4.5V to 28V Input, 2A Output,
Synchronous Buck Converter
DETAILED DESCRIPTION
Overview
The SGM61220 is a 28V/2A synchronous Buck
converter with over-current, short-circuit and thermal
shutdown with auto recovery. Figure 2 shows the
simplified block diagram of the SGM61220. The two
integrated MOSFET switches of the power stage
(66mΩ high-side and 36mΩ low-side) can provide up to
2A of continuous current with high efficiency.
The device is powered up when VIN exceeds the UVLO
threshold (4.1V TYP). At no load and with no switching,
the typical operating current is 25μA and when the
device is disabled by EN pin, it is only 2µA (TYP). The
internal loop compensation minimizes the BOM cost and
simplifies the design. The inrush current is also limited
by an internal 5ms soft-start ramp.
Operating Principle
Peak current mode (PCM) control is used in the
SGM61220 to regulate the output voltage. VOUT is
sensed by the external resistor divider on the FB pin
and compared to the internal 0.603V reference voltage
by a trans-conductance error amplifier. The error
amplifier (EA) output (current) is fed to the internal
compensation components between the EA output and
GND to generate a voltage that is used as the peak
current reference for comparing with the sensed
high-side switch current. The output of this comparator
(COMP) can reset the flipflop that controls the switches.
This flipflop receives fixed frequency clock pulses from
the internal 410kHz oscillator. In the normal operation
the high-side switch is turned on in the beginning of
each switching cycle. The current in the high-side
switch starts to rise until the peak current reference is
reached that resets the flipflop. This will turn off the
high-side switch and turn on the low-side switch. The
low-side switch stays on until the end of the cycle.
Slope Compensation
Peak current mode-controlled devices in general are
subject to sub-harmonic oscillation instability at higher
duty cycles (typically > 50%). To avoid this instability a
compensating ramp signal is used. The ramp starts
from zero in the beginning of each cycle with a specific
slop and is added to the sensed high-side switch
current before it is compared to the peak current
reference.
Anti-High-Overload Mode
The SGM61220 supports overload mode. When the
output current continues overload while the system
power up or in turbo mode, the SGM61220 exports the
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maximize power and limit the maximum peak current in
high-side and valley current in low-side, the device
keeps in cycle-by-cycle limit to obtain the system’s
power request. The SGM61220 does not shut down
until the device heats and then goes to thermal
shutdown. The load increase, the output voltage goes
low, if the output voltage drops to 20%, the device will
go into short protection. It reduces current limit
threshold and the switching frequency goes down due
to reduce power dissipation and device goes into
thermal shutdown. When the output current is low
enough, the device goes into PFM mode.
Pulse Skip Mode (PSM) and PWM Mode
In light load, OVP does not occur and the device can
operate in the normal PWM mode, but to improve light
load efficiency, the device is designed to skip some
pulses by entering to the PSM mode. When the peak
current is lower than 500mA typically, the device enters
PSM. In PSM, when the output voltage is detected to
be above the internal voltage reference level of the
error amplifier, the high-side MOSFET is kept off for a
few cycles (skipping clock pulses) by clamping current
reference until the output voltages are discharged
below the internal voltage reference level. Note that the
integrated current comparator operates based on the
peak inductor current and the average load current may
vary depending on the output filters and load type.
Enable Pin and UVLO Adjustment
The EN pin can be used to turn the device on and off or
to change the UVLO thresholds. The device is enabled
when the EN pin voltage exceeds its high threshold. A
low EN voltage disables the device brings it to the
low-quiescent (IQ) state.
The EN pin is internally pulled up by a small current
source (IP) so the device is enabled if EN pin is floated.
An open drain or open collector output can be used to
control the EN pin.
VIN is monitored by the internal under-voltage lockout
circuit and if it is below UVLO threshold, the device is
disabled. The internal UVLO has a 400mV hysteresis. If
higher thresholds are needed, EN pin can be used as
shown in Figure 3.
The EN pull-up current is used to set the hysteresis.
The pull-up current is increased by IIH - IIL when the EN
pin exceeds its high threshold. Use Equations 1 and 2
to calculate the R1 and R2 values for the desired UVLO
low (VUV_L) and high (VUV_H) thresholds.
APRIL 2022
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4.5V to 28V Input, 2A Output,
Synchronous Buck Converter
SGM61220
DETAILED DESCRIPTION (continued)
R1 =
VUV _ H × VIL − VUV _ L × VIH
R2 =
IIH × VIH − IIL × VIL
R1 × VIL
VUV _ L − VIL + R1 × IIH
(1)
(2)
where:
IIL = 0.45μA (TYP)
IIH= 1.44μA (TYP)
VIL = 1.10V (TYP)
VIH = 1.19V (TYP)
VIN
Bootstrap Voltage (BOOT)
SGM61220
IIL
R1
voltage begins to rise from near 0V to slightly above
0.603V with a ramp time of 5ms. The lower of VREF and
this ramp is used as reference for the error amplifier,
therefore during startup the ramp provides a soft-start
for the output. The soft-start is needed to avoid high
inrush currents caused by rapid increase of output
voltage across output capacitors and the load. Without
a soft-start the current limiting protections could trigger
that interrupts the monotonic rising of the load voltage
that may result in instability or improper system
initialization.
To power the upper switch gate driver, a voltage higher
than VIN is needed. Bootstrapping technique is used to
provide this voltage from the switching node by using a
0.1µF bootstrap capacitor between SW and BOOT pins
along with an internal bootstrap diode. The voltage is
internally regulated for driving the high-side switch. An
X5R or X7R ceramic capacitor is recommended for
CBOOT to have stable capacitance against temperature
and voltage variations. To improve drop out, the device
is designed to operate at 100% duty cycle.
IH = IIH - IIL
EN
R2
Output Short-Circuit Protection
Figure 3. Adjustable VIN Under-Voltage Lockout
Output Voltage Programming
The output voltage is set by a resistor divider between
VOUT and GND that is tapped to the FB pin. It is
recommended to use resistors with 1% tolerance or
better because it directly affects the output accuracy.
Use Equation 3 and Figure 1 to calculate the output
voltage. To improve efficiency at light load consider
larger resistors. Start with 100kΩ for the upper resistor
(RFB1). Note that if RFB1||RFB2 is too high, the FB pin
leakage current and other noises can easily affect the
accuracy and performance of the regulator.
R
VOUT =
VFB × FB1 + 1
R
FB2
(3)
Internal Voltage Reference and Soft-Start
The SGM61220 device has an internal 0.603V
reference (VREF) to program the output at the desired
level. The output voltage is determined by the
reference voltage seen by the error amplifier. When the
converter starts (or is enabled), an internal ramp
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When the output voltage down to 20% of set value, the
device goes into short-circuit mode, and a foldback
mode will limit the current output. The high-side peak
current limit to 2.4A (TYP) and the valley current limit to
1.4A (TYP), then it avoids the device thermal shutdown
by the power dissipation.
A short-circuit is detected when VFB falls below 0.12V
(TYP). In this condition the current limits of both
switches are internally reduced to less than half of the
normal value (foldback). This will reduce the constant
output current during an output short and prevents
overheating. During the soft-start period there is no
foldback and the current limits are normal.
Output Over-Voltage Protection (OVP)
An over-voltage protection is included in the device to
minimize the output voltage overshoots that may occur
after recovery from an output fault or a large unloading
transient. The FB pin voltage is compared with the OVP
thresholds. If the VFB exceeds 108% of the VREF, the
high-side switch is forced to turn off. When the VFB falls
below 104%, the high-side switch is allowed to turn on
again.
APRIL 2022
11
4.5V to 28V Input, 2A Output,
Synchronous Buck Converter
SGM61220
DETAILED DESCRIPTION (continued)
Over-Current Protection (OCP)
The device is protected from over-current conditions by
cycle-by-cycle current limiting on both high-side and
low-side MOSFETs.
High-side MOSFET Over-Current Protection
The internal peak current mode controller provides an
inherent current limiting capability for the high-side
switch on a cycle-by-cycle basis. When high-side
switch current exceeds peak current limit threshold,
high-side switch is turned off, until the next cycle.
Low-side MOSFET Over-Current Protection
The low-side MOSFET current is also monitored for
over-current protection. Normally this MOSFET
sources current to the load (source to drain direction)
while the inductor current is decreasing. At the end of
each cycle, this current is compared to the preset
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low-side current-limit (ILIM_LS). If the inductor valley
current exceeds the low-side current limit, the high-side
MOSFET will not turn on in the next cycle and the
low-side MOSFET continues to conduct (cycle skipped).
The high-side switch turns on again when the valley
current falls below ILIM_LS at the start of another cycle.
During an over-current fault, the above limits cause
cycle skipping that slows down the switching frequency
and reduces the output voltage (due to reduced duty
cycle).
Thermal Shutdown
If the junction temperature exceeds +165℃ (TYP), the
device is forced to stop switching. It will recover
automatically when TJ falls below the recovery threshold.
APRIL 2022
12
4.5V to 28V Input, 2A Output,
Synchronous Buck Converter
SGM61220
APPLICATION INFORMATION
BOOT
CBOOT
0.1μF
SGM61220
VIN = 24V
VOUT = 5V, 2A
L
SW
VIN
C1
10μF
R1
500kΩ
10μH
C2
0.1μF
C3
22μF
RFB1
100kΩ
FB
EN
R2
100kΩ
C4
22μF
RFB2
13.3kΩ
GND
Figure 4. A Reference Design for 5V, 2A Application
Design Requirements
A 10pF feedforward capacitor is optioned to improve the response.
When the output is shorted, a large input capacitor is required to ensure that the output voltage ripple is lower than
1V, otherwise the device may not be stable.
To reduce the output ripple and keep the device stable, the output capacitor must be large. The recommended
value should not be lower than 22μF + 22μF, and a 100μF output capacitor will be very helpful for reducing ripple.
0.1% RFB1, RFB2 will be chosen to improve the output voltage precision, if it is needed.
In order to obtain a small VOUT ripple, it is recommended that the VIN is higher than 7V when the VOUT is 5V, and the
VIN is lower than 20V when the VOUT is 1.8V.
Layout Guide
Layout guide schematic for PCB Layout.
J1
VIN 8V~28V
TP1
VIN
3
C1
10μF
100μF/35V
Optional
C2
0.1μF
R4
510kΩ
5
J2
GND
EN
JP1
4
2
VIN
SGM61220
EN
FB
1
R5
105kΩ
BOOT
R3
13.3kΩ
SW
GND
6
C4
0.1μF
L
2
10μH 5A
TP3
SW
1
J3
VOUT
TP2
VOUT
C5
22μF
C6
22μF
TP4
GND
R2 100kΩ
R1 49.9Ω
C7
NC 5V/2A
TP5
GND
J4
GND
C3
10pF
Figure 5. Schematic for PCB Layout
SG Micro Corp
www.sg-micro.com
APRIL 2022
13
SGM61220
4.5V to 28V Input, 2A Output,
Synchronous Buck Converter
APPLICATION INFORMATION (continued)
Figure 6. PCB Top Layer
Figure 7. PCB Bottom Layer
REVISION HISTORY
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
APRIL 2022 ‒ REV.A to REV.A.1
Page
Updated the Absolute Maximum Ratings and Layout Guide sections............................................................................................................. 2, 13
Changes from Original (NOVEMBER 2020) to REV.A
Page
Changed from product preview to production data ............................................................................................................................................. All
SG Micro Corp
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APRIL 2022
14
PACKAGE INFORMATION
PACKAGE OUTLINE DIMENSIONS
TSOT-23-6
0.69
0.95
D
e
E1
2.59
E
0.99
b
RECOMMENDED LAND PATTERN (Unit: mm)
L
A
θ
A1
0.25
c
A2
Symbol
Dimensions
In Millimeters
MIN
MAX
Dimensions
In Inches
MIN
MAX
1.000
0.043
A
A1
0.000
0.100
0.000
0.004
A2
0.700
0.900
0.028
0.039
b
0.300
0.500
0.012
0.020
c
0.080
0.200
0.003
0.008
D
2.850
2.950
0.112
0.116
E
1.550
1.650
0.061
0.065
E1
2.650
2.950
0.104
e
SG Micro Corp
www.sg-micro.com
0.950 BSC
0.116
0.037 BSC
L
0.300
0.600
0.012
0.024
θ
0°
8°
0°
8°
TX00038.001
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
A0
P1
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
Diameter
Reel Width
W1
(mm)
A0
(mm)
B0
(mm)
K0
(mm)
P0
(mm)
P1
(mm)
P2
(mm)
W
(mm)
Pin1
Quadrant
TSOT-23-6
7″
9.5
3.20
3.10
1.10
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
www.sg-micro.com
DD0002
Reel Type
TX20000.000
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