SGM61020/P [SGMICRO]

2A High Efficiency Synchronous Buck Converter;
SGM61020/P
型号: SGM61020/P
厂家: Shengbang Microelectronics Co, Ltd    Shengbang Microelectronics Co, Ltd
描述:

2A High Efficiency Synchronous Buck Converter

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SGM61020  
2A High Efficiency  
Synchronous Buck Converter  
GENERAL DESCRIPTION  
FEATURES  
The SGM61020 is a high efficiency synchronous Buck  
DC/DC converter with 2A output current capability and  
adjustable output voltage. The input supply voltage is in  
the range of 2.5V to 5.5V. Using adaptive off-time peak  
current control, the efficiency of this device is higher  
than 80% for loads over 1mA and reaches 95% in the  
moderate load ranges (5V to 3.3V).  
2.5V to 5.5V Input Voltage Range  
Adjustable Output Voltage from 0.6V to VIN  
Up to 95% Efficiency  
Low RDSON MOSFET Switches (100mΩ/55mΩ)  
Power-Save Mode for Light Load Efficiency  
42μA (TYP) Operating Quiescent Current  
100% Duty Cycle Capability for Low Dropout  
1.5MHz PWM Switching Frequency  
Power Good Output (SGM61020P Only)  
Over-Current Protection  
This device operates with a quasi-fixed 1.5MHz pulse  
width modulation (PWM) mode for moderate or heavy  
loads. But at light loads, pulse skip modulation is used  
for power-save mode (PSM). The PSM operating  
quiescent current is very low, typically 42μA, which is  
well suitable for battery-powered applications to  
increase standby time. Despite such low quiescent  
current, the transient response to large load variations  
is excellent. The device shutdown current is typically  
0.03μA.  
Thermal Shutdown Protection  
Input Under-Voltage Lockout (UVLO) Protection  
Small Packaging:  
SGM61020: Available in Green SOT-23-5 and  
SOT-563-6 Packages  
SGM61020P: Available in a Green SOT-563-6  
Package  
The SGM61020 provides an adjustable output voltage  
by an external resistor divider. The device is capable for  
low dropout operation with 100% duty cycle. Some  
other features include internal soft-start for limiting  
startup inrush current, over-current and thermal  
shutdown protections, enable input and power good  
output (for SGM61020P version only).  
APPLICATIONS  
Battery-Powered Applications  
Point-of-Load  
Processor Power Supplies  
Hard Disk Drives (HDD)/Solid State Drives (SSD)  
The SGM61020 is available in Green SOT-23-5 and  
SOT-563-6 packages.  
TYPICAL APPLICATION  
L1  
2.2μH  
VIN  
VOUT  
1.8V  
VIN  
SW  
2.5V to 5.5V  
CIN  
4.7μF  
COUT  
10μF  
R1  
200kΩ  
SGM61020P  
R3  
510kΩ  
FB  
EN  
R2  
PG  
GND  
100kΩ  
Power Good  
Figure 1. Typical Application Circuit  
SG Micro Corp  
www.sg-micro.com  
AUGUST2022REV. A.1  
2A High Efficiency  
SGM61020  
Synchronous Buck Converter  
PACKAGE/ORDERING INFORMATION  
SPECIFIED  
TEMPERATURE  
RANGE  
PACKAGE  
DESCRIPTION  
ORDERING  
NUMBER  
PACKAGE  
MARKING  
PACKING  
OPTION  
MODEL  
SOT-23-5  
SOT-563-6  
SOT-563-6  
SGM61020XN5G/TR  
SGM61020XKB6G/TR  
SGM61020PXKB6G/TR  
RAAXX  
ZMXX  
ZNXX  
Tape and Reel, 3000  
Tape and Reel, 5000  
Tape and Reel, 5000  
-40to +125℃  
-40to +125℃  
-40to +125℃  
SGM61020  
SGM61020P  
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.  
MARKING INFORMATION  
SOT-23-5  
SOT-563-6  
(1) XX = Date Code.  
YYY X X  
(2) XX = Date Code.  
YY X X  
Date Code - Week  
Date Code - Week  
Date Code - Year  
Serial Number  
Date Code - Year  
Serial Number  
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.  
Voltage Range Referred to GND  
VIN, EN, PG......................................................... -0.3V to 6V  
FB..................................................................... -0.3V to 5.5V  
SW (DC) ...................................................-0.3V to VIN + 0.3V  
SW (AC, Less than 10ns) while Switching.............. -2V to 9V  
Package Thermal Resistance  
SOT-23-5, θJA .......................................................... 193/W  
SOT-563-6, θJA ........................................................ 170/W  
Junction Temperature .................................................+150℃  
Storage Temperature Range........................-65to +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, VIN.....................................2.5V to 5.5V  
Output Voltage Range, VOUT ................................. 0.6V to VIN  
Output Current Range, IOUT ........................................0 to 2A  
PG Pin Sink Current, ISINK_PG ...............................1mA (MAX)  
Operating Junction Temperature Range......-40to +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  
AUGUST 2022  
2
2A High Efficiency  
SGM61020  
Synchronous Buck Converter  
PIN CONFIGURATIONS  
SGM61020P (TOP VIEW)  
FB  
1
2
6
5
PG  
EN  
GND  
VIN  
3
4
SW  
SOT-563-6  
SGM61020 (TOP VIEW)  
SGM61020 (TOP VIEW)  
EN  
1
2
5
FB  
FB  
1
2
6
5
NC  
EN  
GND  
GND  
VIN  
3
4
SW  
SW  
3
4
VIN  
SOT-23-5  
SOT-563-6  
PIN DESCRIPTION  
PIN  
NAME  
I/O  
FUNCTION  
SOT-23-5  
SOT-563-6  
Active High Enable Input Pin. Apply a logic low to shut down the device or  
pull EN up to VIN pin to enable the device. Do not leave EN floating.  
1
2
3
5
2
4
EN  
GND  
SW  
I
G
P
Ground Pin.  
Switching Node Output Pin. Connect to the output inductor.  
Power Supply Input. Decouple VIN with at least 4.7μF ceramic capacitor  
to GND, as close to the device as possible. (If the input voltage oscillates,  
the input capacitance can be increased.)  
Feedback Input. Connect a resistor divider between the output voltage  
sense point and ground and tap it to the FB pin to set the output voltage.  
4
5
3
1
VIN  
FB  
P
I
NC  
No Connection. This pin can be left open or connected to GND.  
6
Open-Drain Power Good Output Pin (SGM61020P Only). Pull it up with a  
resistor to a positive voltage no more than 5.5V. It can be left open if not  
used.  
PG  
O
NOTE: I = input, O = output, P = power, G = ground.  
SG Micro Corp  
www.sg-micro.com  
AUGUST 2022  
3
2A High Efficiency  
SGM61020  
Synchronous Buck Converter  
ELECTRICAL CHARACTERISTICS  
(VIN = 5V, TJ = +25, unless otherwise noted.)  
PARAMETER  
SYMBOL  
CONDITIONS  
MIN  
TYP  
MAX UNITS  
Power Supply  
Quiescent Current into VIN Pin  
Shutdown Current into VIN Pin  
Under-Voltage Lockout Threshold  
Under-Voltage Lockout Hysteresis  
Thermal Shutdown Threshold  
Thermal Shutdown Hysteresis  
Logic Interface  
IQ  
Not switching  
EN = 0V  
42  
µA  
ISD  
0.03  
2.30  
100  
150  
130  
1
µA  
V
VUVLO  
VHYS  
VIN falling  
2.40  
mV  
TJ rising  
TJ falling  
TJSD  
High-Level Threshold at EN Pin  
Low-Level Threshold at EN Pin  
Soft Startup Time  
VIH  
VIL  
tSS  
VIN = 2.5V to 5.5V  
0.98  
0.86  
800  
1.20  
V
V
VIN = 2.5V to 5.5V  
0.40  
Measure from 0 to 95% × VOUT (set)  
µs  
Output  
SOT-23-5  
SOT-563-6  
SOT-23-5  
SOT-563-6  
SOT-23-5  
SOT-563-6  
0.588  
0.594  
0.600  
0.600  
100  
78  
0.612  
0.606  
Feedback Regulation Voltage  
High-side FET On-Resistance  
Low-side FET On-Resistance  
VFB  
V
mΩ  
mΩ  
RDSON  
55  
41  
High-side FET Current Limit  
Switching Frequency  
SGM61020P Only  
ILIM  
fSW  
2.8  
3.2  
3.6  
0.4  
A
VOUT = 2.5V  
1.5  
MHz  
V
FB rising, referenced to VFB nominal  
95% × VREF  
90% × VREF  
0.1  
Power Good Threshold  
VPG  
V
VFB falling, referenced to VFB nominal  
Power Good Low-Level Output Voltage  
Input Leakage Current into PG Pin  
Power Good Delay Time  
VPG_OL  
IPG_LKG  
tPG_DLY  
ISINK = 1mA  
VPG = 5.0V  
VFB falling  
V
0.01  
µA  
µs  
45  
SG Micro Corp  
www.sg-micro.com  
AUGUST 2022  
4
2A High Efficiency  
SGM61020  
Synchronous Buck Converter  
TYPICAL PERFORMANCE CHARACTERISTICS  
TA = +25, VIN = 5V, VOUT = 1.8V, L1 = 2.2μH, COUT = 10μF, unless otherwise noted.  
PWM Operation  
Power-Save Mode Operation  
VSW  
VOUT  
IL  
VSW  
AC Coupled  
AC Coupled  
VOUT  
IL  
IOUT = 1A  
IOUT = 0.1A  
Time (500ns/div)  
Time (1μs/div)  
Startup and Shutdown with Load  
Startup and Shutdown with Load  
VEN  
VEN  
VOUT  
VOUT  
IL  
IL  
IOUT = 2A  
IOUT = 0.1A  
Time (500μs/div)  
Time (500μs/div)  
Load Transient  
Load Transient  
AC Coupled  
AC Coupled  
VOUT  
VOUT  
IL  
IL  
IOUT = 0.8A to 2A, C1 = 6.8pF  
IOUT = 0.8A to 2A, C1 = 0pF  
Time (5μs/div)  
Time (5μs/div)  
SG Micro Corp  
www.sg-micro.com  
AUGUST 2022  
5
2A High Efficiency  
SGM61020  
Synchronous Buck Converter  
TYPICAL PERFORMANCE CHARACTERISTICS (continued)  
TA = +25, VIN = 5V, VOUT = 1.8V, L1 = 2.2μH (DCR = 18mΩ), unless otherwise noted.  
Efficiency vs. Load Current  
Efficiency vs. Load Current  
100  
95  
90  
85  
80  
75  
70  
65  
60  
100  
95  
90  
85  
80  
75  
70  
65  
60  
VIN = 2.5V  
VIN = 2.5V  
V
V
IN = 3.3V  
IN = 5V  
V
V
IN = 3.3V  
IN = 5V  
VOUT = 1.2V  
VOUT = 1.8V  
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0  
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0  
Load Current (A)  
Load Current (A)  
Efficiency vs. Load Current  
Efficiency vs. Load Current  
100  
95  
90  
85  
80  
75  
70  
65  
60  
100  
95  
90  
85  
80  
75  
70  
65  
60  
VIN = 3.3V  
IN = 5V  
VOUT = 2.5V  
VOUT = 3.3V  
VIN = 5V  
V
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0  
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0  
Load Current (A)  
Load Current (A)  
Load Regulation  
VIN = 5V  
Line Regulation  
VOUT = 1.8V  
1.4  
1.2  
1.0  
0.8  
0.6  
0.4  
0.2  
0.0  
-0.2  
1.00  
0.75  
0.50  
0.25  
0.00  
-0.25  
-0.50  
-0.75  
-1.00  
VOUT = 1.8V  
V
OUT = 3.3V  
IOUT = 0.5A  
I
I
OUT = 1A  
OUT = 2A  
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0  
2.5  
3.0  
3.5  
4.0  
4.5  
5.0  
5.5  
Load Current (A)  
Input Voltage (V)  
SG Micro Corp  
www.sg-micro.com  
AUGUST 2022  
6
2A High Efficiency  
SGM61020  
Synchronous Buck Converter  
TYPICAL PERFORMANCE CHARACTERISTICS (continued)  
TA = +25, VIN = 5V, VOUT = 1.8V, L1 = 2.2μH (DCR = 18mΩ), unless otherwise noted.  
Switching Frequency vs. Load Current  
VIN = 5V  
Switching Frequency vs. Input Voltage  
2.5  
2.0  
1.5  
1.0  
0.5  
0.0  
2.5  
2.0  
1.5  
1.0  
0.5  
0.0  
IOUT = 1A  
VOUT = 1.2V  
VOUT = 1.2V  
V
V
V
OUT = 1.8V  
OUT = 2.5V  
OUT = 3.3V  
V
V
V
OUT = 1.8V  
OUT = 2.5V  
OUT = 3.3V  
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0  
2.5  
3.0  
3.5  
4.0  
4.5  
5.0  
5.5  
Load Current (A)  
Input Voltage (V)  
SG Micro Corp  
www.sg-micro.com  
AUGUST 2022  
7
2A High Efficiency  
SGM61020  
Synchronous Buck Converter  
FUNCTIONAL BLOCK DIAGRAM  
VIN  
Current Sense  
Soft-Start  
PWM  
Comparator  
+
+
+
-
Control Logic  
and Driver  
R
S
SW  
Q
-
VREF  
gm  
FB  
VZCD  
Zero Current Detect  
GND  
PG  
Off-Time  
Calculation  
VREF × 95%  
FB  
Control Contains  
UVLO, TSD, etc  
+
-
EN  
Figure 2. SGM61020/SGM61020P Block Diagram  
DETAILED DESCRIPTION  
Overview  
Power Good Output (SGM61020P Only)  
The PG pin is an open-drain output. PG requires a  
pull-up resistor (e.g. 510kΩ). PG pin is pulled to GND  
before the output voltage is above 95% of the nominal  
voltage. After FB voltage reaches 95% of VREF, the PG  
pin is pulled high immediately. When the FB voltage  
drops below 90% of VREF, the PG pin will be pulled low  
after a 45μs delay. Leave the PG pin unconnected  
when not used.  
The SGM61020 is a high efficiency Buck switching  
converter optimized for handheld battery-powered  
applications. It operates at a quasi-fixed frequency of  
1.5MHz and uses adaptive off-time PWM control for the  
moderate to heavy load range. This allows using a  
small inductor and small capacitors for compact  
designs. At light load condition, this device operates in  
power-save mode to reduce the switching frequency  
and losses for longer battery life. The power-save  
mode quiescent current is 42μA (TYP) while the  
shutdown current is only 0.03μA (TYP).  
Table 1. PG Output Logic  
PG Status  
Reason  
Conditions  
High Z  
Low  
EN = High, VFB ≥ VPG  
EN = High, VFB ≤ VPG  
EN = Low  
Under-Voltage Lockout Protection  
When the input voltage is below the UVLO threshold  
(2.3V, TYP), the device is shut down. If the input  
voltage rises above the UVLO threshold plus a 100mV  
hysteresis, the IC will restart.  
Output Voltage  
Shutdown by EN  
Thermal Shutdown  
UVLO  
TJ > TJSD  
1.4V < VIN < VUVLO  
Power Supply Removal VIN 1.4V  
Enable Input  
The EN pin is a digital control that turns the converter  
on and off states. Drive EN logic high to turn on the  
device; drive it logic low to turn it off. Connect the EN  
pin directly to a voltage source that can’t be higher than  
the VIN pin. The EN input should not be left floating.  
SG Micro Corp  
www.sg-micro.com  
AUGUST 2022  
8
2A High Efficiency  
SGM61020  
Synchronous Buck Converter  
DETAILED DESCRIPTION (continued)  
If the load is still low, the output will go slightly higher  
than normal again and the switches will be turned off. In  
power-save mode, the output voltage is slightly higher  
than nominal output voltage. This effect can be  
mitigated by a larger output capacitor.  
Soft Startup and Pre-biased Output  
An 800μs internal soft-start circuit is designed to  
prevent input inrush current and voltage drops during  
startup. This circuit slowly ramps up the error amplifier  
reference voltage (VREF = 0.6V) after exiting the  
shutdown state or under-voltage lockout (UVLO). Slow  
increase of the output voltage prevents the excessive  
inrush current for charging the output capacitors and  
creates a smooth output voltage rise. The other  
advantage of a soft-start is avoiding supply voltage  
drops especially on the high internal impedance  
sources such as the primary cells and rechargeable  
batteries.  
Low Dropout Operation (100% Duty Cycle)  
When the input voltage reduces, the on-time increases.  
When the input voltage is lower than the regulation  
output voltage, the output voltage drops, and the  
SGM61020 goes into 100% duty cycle mode. The  
high-side switch is always turned on, and the output  
voltage is determined by the load current times the  
R
DSON composed by the high-side switch and inductor.  
The SGM61020 is also capable of starting with a  
pre-biased output capacitor when it is powering up or  
enabled. When the device is turning on, a bias on the  
output may exist due to the other sources connected to  
the load(s) such as multi-voltage ICs or simply because  
of residual charges on the output capacitors. For  
example, when a device with light load is disabled and  
re-enabled, the output may not drop during the off  
period and the device must restart under pre-biased  
output condition. Without the pre-biased capability, the  
device may not be able to startup properly. The output  
ramp is automatically initiated with the bias voltage and  
ramps up to the nominal output value.  
Current Limit Protection  
Limiting the switch current protects the switch itself and  
also prevents over-current in the source and the  
inductor. If the high-side (HS) switch current exceeds  
the ILIM threshold, HS switch is turned off and the  
low-side (LS) switch will be turned on to reduce the  
inductor current and limit the peak.  
Note that the measured peak current limit in the  
closed-loop and open-loop (ILIM_OL) test conditions is  
slightly different, mainly due to the current comparator  
propagation delay.  
Power-Save Mode (PSM)  
Thermal Shutdown  
At light load condition, the SGM61020 shifts to the PSM  
mode and operates with pulse skip modulation to  
reduce the switching frequency and minimize the  
losses. It also shuts down most of the internal circuits in  
PSM. In this mode, one or more PWM pulses are sent  
to charge the output capacitor and then the switches  
are kept off. The output capacitor voltage gradually  
drops due to small load current and when it falls below  
the nominal voltage threshold, the PWM pulses resume.  
A thermal shutdown function is implemented to prevent  
damage caused by excessive heat and power dissipation.  
Once the junction temperature exceeds +150°C, the  
device is shut down. The device is released from  
shutdown automatically when the junction temperature  
decreases by 20.  
SG Micro Corp  
www.sg-micro.com  
AUGUST 2022  
9
2A High Efficiency  
SGM61020  
Synchronous Buck Converter  
APPLICATION INFORMATION  
In this section, power supply design with the SGM61020 synchronous Buck converter and selection of the external  
component will be explained based on the typical application that is applicable for various input and output voltage  
combinations.  
L1  
2.2μH  
VIN  
VOUT  
1.8V  
VIN  
EN  
SW  
2.5V to 5.5V  
C1  
4.7μF  
C3  
10μF  
C4  
NS  
R1  
C2  
NS  
200kΩ  
SGM61020P  
R3  
510kΩ  
FB  
R2  
PG  
100kΩ  
GND  
Power Good  
Figure 3. SGM61020P Application Example with 1.8V/2A Output  
larger value can be selected to reduce the input current  
ripple.  
Design Requirements  
Table 2 summarizes the requirements for this example  
as shown in Figure 3. The selected components are  
given in Table 3.  
Inductor Selection  
The important factors for inductor selection are  
inductance (L1), saturation current (ISAT), RMS rating  
(IRMS), DC resistance (DCR) and dimensions. Use  
Equations 1 and 2 to find the inductor peak current  
(IL_MAX) and peak-to-peak ripple current (∆IL) in static  
conditions:  
Table 2. Design Parameters for the Application Example  
Design Parameter  
Input Voltage  
Example Value  
2.5V to 5.5V  
1.8V  
Output Voltage  
Output Current  
2A  
ΔIL  
Output Ripple Voltage  
< 30mV  
(1)  
IL_MAX = IO_MAX  
+
2
Table 3. Selected Components for the Design Example  
1D  
L× fSW  
(2)  
ΔIL = VOUT  
×
Ref  
C1  
Description  
Manufacturer  
Murata  
4.7µF, 10V, X7R, 0805, Ceramic  
P/N: GRM21BR71A475ME51L  
where:  
C2, C4  
C3  
NS  
Standard  
Murata  
IO_MAX is the maximum load current, D = VOUT/VIN represents  
duty cycle and fSW is the switching frequency.  
10µF, 10V, X7R, 0805, Ceramic  
P/N: GRM21BR71A106KA73L  
2.2µH Wire Wound, DCRMAX = 39m,  
ISAT should be higher than IL_MAX, and sufficient margin  
should be reserved. Typically, the saturation current  
above high-side current limit is enough, and a 10% to  
30% ripple current is selected to calculate the  
inductance. Larger inductance values reduce the ripple  
current but lead to sluggish transient response.  
ISAT(30%) = 4.9A, IRMS(40 ) = 3A,  
L1  
Sunlord  
4mm × 4mm × 3mm,  
P/N: SWPA4030S2R2NT  
Value Depends on VOUT, 200k, 1%,  
0603, 1/16W Chip Resistor  
R1  
Standard  
R2  
R3  
100kΩ, 1%, 0603, 1/16W Chip Resistor  
Standard  
Standard  
510kΩ, 5%, 0603, 1/16W Chip Resistor  
Output Voltage Setting  
Input Capacitor Selection (CIN)  
Use Equation 3 to select the R1/R2 resistor divider to  
set the VOUT. Select the R2 value less than 100kΩ to  
compromise noise sensitivity and light load losses.  
High frequency decoupling input capacitors with low  
ESR are needed to circulate and absorb the high  
frequency switching currents of the converter. Place  
this capacitor right beside the VIN and GND pins. A  
4.7μF ceramic capacitor with X5R or better dielectric  
and 0805 or smaller size is sufficient in most cases. A  
R1  
R2  
R
1   
VOUT = VFB × 1+  
= 0.6V × 1+  
(3)  
R2  
SG Micro Corp  
www.sg-micro.com  
AUGUST 2022  
10  
 
 
2A High Efficiency  
SGM61020  
Synchronous Buck Converter  
APPLICATION INFORMATION (continued)  
Output Capacitor Selection (COUT  
)
Output Filter Design  
This device is capable to operate with low ESR ceramic  
capacitors to get low voltage ripple and fast response.  
10μF ~ 22μF × 2 capacitors with X7R or X5R dielectric  
type are recommended. Minimum capacitance of  
output ripple criteria can be calculated from Equation 4.  
Table 4 can be used to select the proper LC filter  
components for most design requirements. The  
inductor initial tolerance can be as high as -30% to +20%  
of the nominal value and proper current derating is  
usually required. Bias voltage may cause significant  
capacitance drops in the ceramic capacitors. The  
effective deviation of a ceramic capacitor can be as  
high as -50% to +20% of the nominal value.  
ΔIL  
(4)  
COUT  
>
8× fSW × VOUT _RIPPLE  
For output capacitor selection, transient response and  
loop stability should also be considered. To simplify  
customer's design process, the inductor and output  
capacitor combinations are recommended in Table 4.  
L1 = 2.2µH, COUT = 10µF are the recommended values  
for the typical application.  
Layout Guidelines  
A good printed-circuit-board (PCB) layout is a critical  
element of any high performance design. Follow the  
guidelines below for designing a good layout for the  
SGM61020.  
Table 4. Proper Output Capacitor and Inductor Combination  
VOUT  
L1  
COUT  
22µF  
1µH  
Place the input capacitor close to the device with the  
22µF × 2  
22µF  
0.9V  
shortest possible connection traces.  
2.2µH  
1µH  
22µF × 2  
10µF  
Share the same GND return point for the input and  
output capacitors and locate it as close as possible  
to the device GND pin to minimize the AC current  
loops. Place the inductor close to the switching node  
and connect it with a short trace to minimize the  
parasitic capacitances coupled to the SW node.  
22µF  
22µF × 2  
10µF  
1.8V  
3.3V  
2.2µH  
2.2µH  
22µF  
Keep the signal traces like the FB sense line away  
22µF × 2  
10µF  
from SW or other noisy sources.  
22µF  
Use GND planes in mid-layers for shielding and  
minimizing the ground potential drifts.  
22µF × 2  
Refer to Figure 4 and Figure 5 for a recommended PCB  
layout.  
SG Micro Corp  
www.sg-micro.com  
AUGUST 2022  
11  
 
2A High Efficiency  
SGM61020  
Synchronous Buck Converter  
APPLICATION INFORMATION (continued)  
Top Layer  
Bottom Layer  
Figure 4. SOT-23-5 PCB layout  
Top Layer  
Bottom Layer  
Figure 5. SOT-563-6 PCB layout  
SG Micro Corp  
www.sg-micro.com  
AUGUST 2022  
12  
 
 
2A High Efficiency  
SGM61020  
Synchronous Buck Converter  
REVISION HISTORY  
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.  
Changes from REV.A (AUGUST 2022) to REV.A.1  
Page  
Updated Electrical Characteristics .......................................................................................................................................................................4  
Changes from Original (MARCH 2022) to REV.A  
Page  
Changed from product preview to production data.............................................................................................................................................All  
SG Micro Corp  
www.sg-micro.com  
AUGUST 2022  
13  
PACKAGE INFORMATION  
PACKAGE OUTLINE DIMENSIONS  
SOT-23-5  
1.90  
D
e1  
2.59  
E1  
E
0.99  
b
e
0.95  
0.69  
RECOMMENDED LAND PATTERN (Unit: mm)  
L
A2  
A
ccc  
C
SEATING PLANE  
A1  
θ
c
C
0.25  
Dimensions In Millimeters  
Symbol  
MIN  
MOD  
MAX  
1.450  
0.150  
1.300  
0.500  
0.220  
3.050  
1.750  
3.000  
A
A1  
A2  
b
-
-
0.000  
0.900  
0.300  
0.080  
2.750  
1.450  
2.600  
-
-
-
c
-
D
-
E
-
E1  
e
-
0.950 BSC  
e1  
L
1.900 BSC  
0.300  
0°  
-
-
0.600  
8°  
θ
ccc  
0.100  
NOTES:  
1. This drawing is subject to change without notice.  
2. The dimensions do not include mold flashes, protrusions or gate burrs.  
3. Reference JEDEC MO-178.  
SG Micro Corp  
TX00033.001  
www.sg-micro.com  
PACKAGE INFORMATION  
PACKAGE OUTLINE DIMENSIONS  
SOT-563-6  
D
e
b
E1  
E
L1  
L
0.30  
0.50  
A
A1  
1.35  
θ
0.45  
θ
c
RECOMMENDED LAND PATTERN (Unit: mm)  
Dimensions  
In Millimeters  
Dimensions  
In Inches  
Symbol  
MIN  
MAX  
0.600  
0.050  
0.270  
0.180  
1.700  
1.300  
1.700  
0.550  
0.300  
0.400  
MIN  
MAX  
0.024  
0.002  
0.011  
0.007  
0.067  
0.051  
0.067  
0.022  
0.012  
0.016  
A
A1  
b
0.525  
0.000  
0.170  
0.090  
1.500  
1.100  
1.500  
0.450  
0.100  
0.200  
0.021  
0.000  
0.007  
0.004  
0.059  
0.043  
0.059  
0.018  
0.004  
0.008  
c
D
E
E1  
e
L
L1  
θ
9° REF  
9° REF  
NOTES:  
1. Body dimensions do not include mode flash or protrusion.  
2. This drawing is subject to change without notice.  
SG Micro Corp  
TX00187.000  
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-23-5  
7″  
7″  
9.5  
9.5  
3.20  
1.78  
3.20  
1.78  
1.40  
0.69  
4.0  
4.0  
4.0  
4.0  
2.0  
2.0  
8.0  
8.0  
Q3  
Q3  
SOT-563-6  
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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