SGM6603
90% Efficient Synchronous
Boost Converter with 1.1A Switch
GENERAL DESCRIPTION
FEATURES
The SGM6603 is a constant frequency, current mode,
synchronous boost switching regulator. The input
voltage can accept the voltage at a range from 0.9V to
5.5V. And the output voltage is adjustable with a peak
of 5.5V. This device also has the 3.3V and 5.0V fixed
output versions.
● 0.9V to 5.5V Input Voltage Range
● 3.3V and 5.0V Fixed Output Voltages
● Adjustable Output Voltage up to 5.5V
● 90% Peak Efficiency
● 30µA (TYP) Quiescent Current
● 1μA (MAX) Shutdown Current
High switching frequency minimizes the sizes of
inductor and capacitor. Integrated power MOSFETs
and internal compensation make the SGM6603 simple
to use and fit the total solution into a compact space.
● 6V Output Voltage Clamping
● Improved Light Load Efficiency with Power-Save
Mode (PSM)
● Load Disconnected in Shutdown
The SGM6603 enters the power-save mode at light
loads to maintain high efficiency. Anti-ringing control
circuitry reduces EMI concerns by damping the inductor
in discontinuous mode. The SGM6603 provides true
output disconnection, allowing VOUT to go to zero volt
during shutdown without drawing any current from the
input source.
● Over-Temperature Protection
● Available in a Green SOT-23-6 Package
● -40℃ to +85℃ Operating Temperature Range
APPLICATIONS
Single-Cell Li Battery Powered Products
The output voltage of SGM6603-ADJ can be
programmed by an external resistor divider, and those
of SGM6603-3.3/SGM6603-5.0 are fixed internally on
the chip. The device is available in a Green SOT-23-6
package. It operates over an ambient temperature
range of -40℃ to +85℃.
Portable Audio Players
Mobile Phones
Personal Medical Devices
TYPICAL APPLICATION
L
4.7μH
VIN
1
C1
10μF
6
ON
3
SW
VCC
EN
VOUT
SGM6603
OFF
R1
FB
GND
2
Adjustable Output
5
C2
10μF
4
R2
Figure 1. Typical Application Circuit
SG Micro Corp
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SEPTEMBER 2021 – REV. B
90% Efficient Synchronous
Boost Converter with 1.1A Switch
SGM6603
PACKAGE/ORDERING INFORMATION
MODEL
SGM6603
VOUT (V)
PACKAGE
DESCRIPTION
SPECIFIED
TEMPERATURE
RANGE
ORDERING
NUMBER
PACKAGE
MARKING
PACKING
OPTION
Adjustable
SOT-23-6
-40℃ to +85℃
SGM6603-ADJYN6G/TR
SC8XX
Tape and Reel, 3000
3.3
SOT-23-6
-40℃ to +85℃
SGM6603-3.3YN6G/TR
SC9XX
Tape and Reel, 3000
5.0
SOT-23-6
-40℃ to +85℃
SGM6603-5.0YN6G/TR
SCAXX
Tape and Reel, 3000
MARKING INFORMATION
NOTE: XX = Date Code.
YYY X X
Date Code - Month
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 on SW, VOUT, VCC, FB, EN
............................................................................. -0.3V to 6V
Package Thermal Resistance
SOT-23-6, θJA .......................................................... 150℃/W
Junction Temperature .................................................+150℃
Storage Temperature Range ........................ -65℃ to +150℃
Lead Temperature (Soldering, 10s) ............................+260℃
ESD Susceptibility
HBM ............................................................................. 4000V
MM ................................................................................. 250V
RECOMMENDED OPERATING CONDITIONS
Operating Ambient Temperature Range ......... -40℃ to +85℃
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 if ESD protections are
not considered carefully. 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 even small parametric changes could cause the
device not to meet the published specifications.
DISCLAIMER
SG Micro Corp reserves the right to make any change in
circuit design, or specifications without prior notice.
SG Micro Corp
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SEPTEMBER 2021
2
90% Efficient Synchronous
Boost Converter with 1.1A Switch
SGM6603
PIN CONFIGURATION
(TOP VIEW)
SW
1
6
VCC
GND
2
5
VOUT
EN
3
4
NC/FB
SOT-23-6
PIN DESCRIPTION
PIN
NAME
1
SW
2
GND
3
EN
Enable Input.
NC
No Connect. It should be left floating. (SGM6603-3.3/SGM6603-5.0)
FB
Output Voltage Feedback Pin. An external resistor divider programs the output
voltage. (SGM6603-ADJ)
4
5
VOUT
6
VCC
FUNCTION
Boost and Rectifying Switch Input.
Ground.
Output.
Supply Voltage.
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3
90% Efficient Synchronous
Boost Converter with 1.1A Switch
SGM6603
ELECTRICAL CHARACTERISTICS
(Full = -40℃ to +85℃, typical values are at TA = +25℃, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
TEMP
MIN
Full
2.5
TYP
MAX
UNITS
5.5
V
DC/DC Stage
Output Voltage Range
VOUT
RL = 3.3kΩ
Full
RL = 270Ω
Full
0.9
1.3
1.1
1.4
Minimum Input Voltage Range
for Startup
VIN
Input Voltage Range after Startup
VIN
+25℃
0.9
Feedback Voltage
VFB
Full
485
500
519
mV
Oscillator Frequency
f
Full
870
1200
1470
kHz
Switch Current Limit
ISW
Full
0.75
1.1
1.45
A
Startup Current Limit
+25℃
300
mA
+25℃
480
mΩ
+25℃
600
mΩ
Boost Switch-On Resistance
VOUT = 3.3V
Rectifying Switch-On Resistance
VOUT = 3.3V
Output Voltage Accuracy
VCC = 1.2V, IO = 10mA
Full
Line Regulation
VCC = 0.9V to VOUT - 0.5V, IO = 10mA
Full
0.1
+25℃
0.5
Full
0.1
1
VOUT = 3.3V
+25℃
30
45
VOUT = 5V
+25℃
33
55
Load Regulation
VCC
Quiescent Current
VEN = VCC = 1.2V,
IO = 0mA
VOUT
Shutdown Current
VEN = 0V, VCC = 1.2V
V
5.5
3.8
%
1
%
%
+25℃
1
µA
µA
µA
Control Stage
EN Input Low Voltage
EN Input High Voltage
EN Input Current
VIL
VIH
0.9V ≤ VCC ≤ 1.8V
Full
0.12×VCC
1.8V < VCC ≤ 3 .3V
Full
0.5
3.3V < VCC ≤ 4.2V
Full
0.6
4.2V < VCC ≤ 5.0V
Full
0.9V ≤ VCC ≤ 1.8V
Full
0.8×VCC
1.8V < VCC ≤ 3 .3V
Full
2
3.3V < VCC ≤ 4.2V
Full
2.4
4.2V < VCC ≤ 5.0V
Full
2.6
Clamped on GND or VCC
Full
V
0.6
V
1
µA
Over-Temperature Protection
150
℃
Over-Temperature Hysteresis
20
℃
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SEPTEMBER 2021
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90% Efficient Synchronous
Boost Converter with 1.1A Switch
SGM6603
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency vs. Input Voltage
Efficiency vs. Input Voltage
100
100
IO = 50mA
80
IO = 100mA
IO = 5mA
70
80
IO = 10mA
70
IO = 5mA
60
60
50
IO = 60mA
90
Efficiency (%)
Efficiency (%)
90
VOUT = 3.3V
0.9
1.3
1.7
2.1
2.5
2.9
50
3.3
VOUT = 5.0V
0.9
1.5
2.1
Output Voltage vs. Output Current
3.36
3.32
3.28
3.24
1
10
100
5.10
5.05
5.00
4.95
4.90
1000
Maximum Output Current (mA)
VOUT = 5V
VOUT = 3.3V
10
1.7
2.5
3.3
4.1
Input Voltage (V)
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10
100
1000
Maximum Output Current vs. Input Voltage
Quiescent Current vs. Input Voltage
1000
100
1
Output Current (mA)
Output Current (mA)
0.9
VCC = 3.6V
VOUT = 5.0V
5.15
Output Voltage (V)
Output Voltage (V)
4.5 5.0
5.20
VCC = 2.4V
VOUT = 3.3V
3.40
Quiescent Current (μA)
3.9
Output Voltage vs. Output Current
3.44
1
3.3
Input Voltage (V)
Input Voltage (V)
3.20
2.7
4.9
5.5
800
700
600
500
400
300
200
VOUT = 3.3V
VOUT = 2.5V
VOUT = 5.5V
VOUT = 5.0V
100
0
0.9 1.4 1.9 2.4 2.9 3.4 3.9 4.4 4.9 5.4
Input Voltage (V)
SEPTEMBER 2021
5
90% Efficient Synchronous
Boost Converter with 1.1A Switch
SGM6603
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
Line Transient Response
Line Transient Response
AC Coupled
AC Coupled
AC Coupled
VIN
VOUT
AC Coupled
VIN = 3V to 3.6V, RL = 25Ω, VOUT = 5V
VIN = 1.8V to 2.4V, RL = 33Ω, VOUT = 3.3V
Time (2ms/div)
Time (2ms/div)
Load Transient Response
Load Transient Response
IOUT
AC Coupled
50mV/div
50mV/div
AC Coupled
VOUT
50mA/div
50mA/div
IOUT
VOUT
VIN = 1.2V, IL = 20mA to 80mA, VOUT = 3.3V
VIN = 3.6V, IL = 20mA to 80mA, VOUT = 5V
Time (2ms/div)
Time (2ms/div)
Output Voltage in Continuous Mode
Output Voltage in Continuous Mode
AC Coupled
20mV/div
VIN = 1.2V, RL = 33Ω, VOUT = 3.3V
Time (1μs/div)
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VOUT
200mA/div
100mA/div
IL
20mV/div
AC Coupled
VOUT
100mV/div
100mV/div
VOUT
500mV/div
500mV/div
VIN
IL
VIN = 3.6V, RL = 25Ω, VOUT = 5V
Time (1μs/div)
SEPTEMBER 2021
6
90% Efficient Synchronous
Boost Converter with 1.1A Switch
SGM6603
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
Output Voltage in Power-Save Mode
Output Voltage in Discontinuous Mode
VOUT
50mA/div
20mA/div
IL
IL
VIN = 3.6V, RL = 2.5kΩ, VOUT = 5.0V
VIN = 1.2V, RL = 3.3kΩ, VOUT = 3.3V
Time (40μs/div)
Time (400ns/div)
Startup after Enable
Startup after Enable
VOUT
EN
VIN = 3.6V, RL = 50Ω, VOUT = 5V
IL
Time (200μs/div)
Time (200μs/div)
Efficiency vs. Output Current
Efficiency vs. Output Current
100
80
80
VCC = 1.2V
Efficiency (%)
100
60
VCC = 0.9V
VCC =1.8 V
40
200mA/div
VIN = 2.4V, RL = 33Ω, VOUT = 3.3V
SW
200mA/div
IL
5V/div
VOUT
5V/div
SW
5V/div 2V/div
2V/div 2V/div
EN
Efficiency (%)
50mV/div
VOUT
AC Coupled
10mV/div
AC Coupled
60
VCC = 1.8V
VCC = 2.4V
VCC = 0.9V
40
20
20
VOUT = 3.3V
VOUT = 2.5V
0
0.01
0.1
1
10
Output Current (mA)
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100
1000
0
0.01
0.1
1
10
100
1000
Output Current (mA)
SEPTEMBER 2021
7
90% Efficient Synchronous
Boost Converter with 1.1A Switch
SGM6603
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
Efficiency vs. Output Current
100
Efficiency (%)
80
VCC = 2.4V
60
VCC = 1.8V
VCC = 3.6V
40
20
VOUT = 5V
0
0.01
0.1
1
10
100
1000
Output Current (mA)
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SEPTEMBER 2021
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90% Efficient Synchronous
Boost Converter with 1.1A Switch
SGM6603
TYPICAL APPLICATION CIRCUITS
L
4.7μH
VIN
1
C1
4.7μF
6
ON
3
VCC
EN
SW
SGM6603
OFF
VCC Boost Output
5
VOUT
C2
10μF
R1
4
FB
GND
R2
2
Figure 2. Small Total Solution Size Power Supply Circuit
L
4.7μH
VIN
1
C1
4.7μF
6
ON
3
VCC
EN
SW
VOUT
5
C2
10μF
SGM6603
OFF
GND
2
FB
LED Current
Up to 30mA
D
4
R1
Figure 3. Circuit of Powering White LEDs in Lighting Applications
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SEPTEMBER 2021
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90% Efficient Synchronous
Boost Converter with 1.1A Switch
SGM6603
FUNCTIONAL BLOCK DIAGRAM
L
CIN
0.9V to 5.5V
SW
VCC
VOUT
Good
Start-Up
OSC
A
B
A/B
MUX
VIN
2.3V
Well
Switch
VOUT 2.5V to 5.5V
COUT
Σ
Slope
COMP
PWM
Comparator
-
Sync
Drive
Control
PWM
Control
Ramp GEN
1.2MHz
+
Current
Sense
R1
+
-
gm
Error
AMP
RC
300kΩ
Power Saving
Power-Save Mode
Operation
Control
Shutdown
Control
EN
CC
150pF
CP2
2.5pF
FB
+
0.5V
REF
R2
Shutdown
GND
Figure 4. Block Diagram
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SEPTEMBER 2021
10
90% Efficient Synchronous
Boost Converter with 1.1A Switch
SGM6603
APPLICATION INFORMATION
Design
The SGM6603 is a synchronous boost converter
capable of starting up from 0.9V input, which is suitable
for majority of readily available input sources. The
device is capable of providing up to 5.5V output, and
the integrated power MOSFET has 1.1A (TYP) switch
current limit.
Startup
After enabling, the device works with a fixed duty cycle
of 50% and reduces current limit of 400mA until the
output voltage reaches to 2.3V. And then the current
limit will be set to 50% of its nominal value to avoid high
peak current drawn from the input during startup. The
current limit is gradually increased to the nominal value
as the output voltage reaches regulation target.
Output Voltage Configuration
The SGM6603 supports output voltage up to 5.5V, and
a resistor divider connected at FB pin is used to
configure the output voltage. The resistive divider value
is calculated via Equation 1.
VOUT − VFB
R1
=
VFB
R2
(1)
For simplicity, 100kΩ is recommended for R2. A 560kΩ
resistor for R1 configures the output voltage to 3.3V.
Inductor Selection
Inductor is an essential element for today’s DC/DC
switch mode power supplies regardless of topology.
Inductor serves as the energy storage element for
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power conversion. Inductance and inductor’s saturation
current are two most important criterions for inductor
selection. For general rule of thumb, the selected
inductance should provide a peak to peak ripple current
that is around 30% of the average inductor current at
full load and nominal input voltage. The average
inductor current for a boost converter is the input
current. Equation 2 shows the calculation of inductance
selection, where f is the switching frequency, ΔIL is the
inductor ripple current.
L=
VCC
ΔIL × fSW
× 1 -
VO
VIN
(2)
The selected inductor should have a saturation current
rating higher than the 1.1A current limit of SGM6603.
Lastly, the inductor affects the close loop response of
the DC/DC converter. The SGM6603 is an internally
compensated device with the loop response optimized
for inductor in the range of 2.2µH to 10µH.
Input Capacitor
Boost converter’s input capacitor sees continuous
current throughout the entire switching cycle. A 10µF
ceramic capacitor is recommended to place as close as
possible between the VCC pin and GND pin of
SGM6603. For the applications where the SGM6603 is
located far away from the input source, a 47µF or
higher capacitance capacitor is recommended to damp
the wiring harness’s inductance.
SEPTEMBER 2021
11
90% Efficient Synchronous
Boost Converter with 1.1A Switch
SGM6603
APPLICATION INFORMATION (continued)
Output Capacitor
The output capacitors of boost converter dictate the
output voltage ripple and load transient response.
Equation 3 is used to estimate the necessary
capacitance to achieve desired output voltage ripple.
Where ΔV is the maximum allowed ripple.
CMIN =
I O × ( VOUT − VCC )
f × ΔV × VOUT
(3)
Again, the SGM6603 is an internally compensated
device. The loop response is optimized for capacitor in
the range of 4.7µF to 22µF. Due to the DC bias nature
of ceramic capacitors, care should be taken by verifying
manufacture’s datasheet to ensure enough effective
capacitance at desired output voltage.
Layout Guidelines
In addition to component selection, layout is a critical
step to ensure the performance of any switch mode
power supplies. Poor layout could result in system
instability, EMI failure, and device damage. Thus, place
the inductor, input and output capacitors as close to the
IC as possible, and use wide and short traces for
current carrying traces to minimize PCB inductance.
For boost converter, the output capacitor’s current loop
from VOUT pin back to the GND pin of the device
should be as small as possible.
Figure 5. Layout Example
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SEPTEMBER 2021
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SGM6603
90% Efficient Synchronous
Boost Converter with 1.1A Switch
REVISION HISTORY
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
SEPTEMBER 2021 ‒ REV.A.4 to REV.B
Page
Added Figure 5 Layout Example section ................................................................................................................................................................15
AUGUST 2021 ‒ REV.A.3 to REV.A.4
Page
Added the Functional Block Diagram and Startup sections ............................................................................................................................. 12, 13
FEBRUARY 2018 ‒ REV.A.2 to REV.A.3
Page
Update the Typical Performance Characteristics
Efficiency vs. Input Voltage (VOUT = 3.3V, VOUT = 5.0V) ............................................................................................................................................5
APRIL 2015 ‒ REV.A.1 to REV.A.2
Page
Update the Electrical Characteristics
VIH (0.9V ≤ VCC ≤ 1.8V) 1.5V - 0.8VCC........................................................................................................................................................................4
JANUARY 2015 ‒ REV.A to REV.A.1
Page
Update the Electrical Characteristics
Switch Current Limit ..................................................................................................................................................................................................4
Add dot on pin 1 SOT-23-6 ................................................................................................................................................................................ 3, 14
Changes from Original (JANUARY 2013) to REV.A
Page
Changed from product preview to production data .................................................................................................................................................All
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13
PACKAGE INFORMATION
PACKAGE OUTLINE DIMENSIONS
SOT-23-6
D
e1
e
2.59
E
E1
0.99
b
0.95
0.69
RECOMMENDED LAND PATTERN (Unit: mm)
L
A
A1
θ
A2
Symbol
Dimensions
In Millimeters
MIN
MAX
c
0.2
Dimensions
In Inches
MIN
MAX
A
1.050
1.250
0.041
0.049
A1
0.000
0.100
0.000
0.004
A2
1.050
1.150
0.041
0.045
b
0.300
0.500
0.012
0.020
c
0.100
0.200
0.004
0.008
D
2.820
3.020
0.111
0.119
E
1.500
1.700
0.059
0.067
E1
2.650
2.950
0.104
0.116
e
0.950 BSC
0.037 BSC
e1
1.900 BSC
0.075 BSC
L
0.300
0.600
0.012
0.024
θ
0°
8°
0°
8°
NOTES:
1. Body dimensions do not include mode flash or protrusion.
2. This drawing is subject to change without notice.
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TX00034.000
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
SOT-23-6
7″
9.5
3.17
3.23
1.37
4.0
4.0
2.0
8.0
Q3
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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
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DD0002
Reel Type
TX20000.000
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