SGM6029 [SGMICRO]
Ultra-Low Quiescent Current, Synchronous Buck Converter;
| 型号： | SGM6029 |
| 厂家： | 
Shengbang Microelectronics Co, Ltd |
| 描述： | Ultra-Low Quiescent Current, Synchronous Buck Converter |
| 文件： | 总24页 (文件大小：1451K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SGM6029
Ultra-Low Quiescent Current,
Synchronous Buck Converter
GENERAL DESCRIPTION
FEATURES
The SGM6029 family is a low voltage, efficient and
miniature synchronous Buck converter with ultra-low
quiescent current. Operating at high switching
frequency (4.0MHz, TYP), miniature inductors and
capacitors can be used to achieve minimal solution size.
The rated load current is from 0.6A to 1A depending on
the input voltage and operating frequency. For high
light-load efficiency, the operating mode can smoothly
and automatically change between power-save mode
and PWM.
● 1.95V to 5.5V Input Voltage Range
● 2.3μA (TYP) Quiescent Current
● Selectable Switching Frequency of 4.0MHz or
1.5MHz
● 0.4V Internal Reference Voltage
● 0.6A to 1A Peak Output Current
● 2% Output Voltage Regulation Accuracy Full
Temperature Range
● Programmable Light Load PSM or FPWM
● Simple Output Voltage Programming with
Integrated R2D Converter
The dual-role VSEL/MODE pin sets the output voltage
to one of the 16 preset values by sensing an external
resistor during startup using an integrated resistor to
digital (R2D) converter. After startup, this pin acts as
MODE input and applying a logic high on it will force the
device in the pulse width modulation (PWM) mode. This
will allow using the same part for a wide range of
voltage rails in different applications and offer a better
output accuracy compared to the conventional external
feedback resistor divider. In the forced-PWM (FPWM),
the device switches at 4.0MHz (A, B and C versions) or
1.5MHz (D and E versions). High switching frequency
reduces the output ripple, but at lighter loads, sacrifices
the efficiency a little bit.
● 16 Selectable + 1 Fixed Output Voltage Levels:
SGM6029A (4.0MHz): 0.4V to 0.775V
SGM6029B (4.0MHz): 0.8V to 1.55V
SGM6029C (4.0MHz): 1.8V to 3.3V
SGM6029D (1.5MHz): 0.4V to 0.775V
SGM6029E (1.5MHz): 0.8V to 1.55V
● Enable Pin with Auto Pull-Down during Startup
● Miniature 0201 Optimized Pinout
● Output Discharge Feature (When Disabled)
● 100% Duty Cycle Operation Capability
● Available in a Green WLCSP-0.74×1.09-6B Package
APPLICATIONS
Wearable Electronics
IoT Applications
The SGM6029 is available in a Green WLCSP-
0.74×1.09-6B package.
2 × 1.5V Battery Powered Applications
Smart Phones
TYPICAL APPLICATION
L1
0.47μH
L1
0.47μH
VIN
VOUT
0.8V to 1.55V
VIN
1.2V fixed VOUT
1.95V to 5.5V
1.95V to 5.5V
VIN
SW
VIN
EN
SW
SGM6029B
SGM6029B
VOS
VOS
CIN
COUT
10μF
CIN
4.7μF
COUT
PWM
VSEL/
MODE
VSEL/
MODE
4.7μF
10μF
PFM
EN
*
ON
ON
RVSEL
OFF
OFF
GND
GND
* 16 selectable VOUT
Figure 1. Typical Application Circuits
SG Micro Corp
www.sg-micro.com
SEPTEMBER2022–REV. A
Ultra-Low Quiescent Current,
Synchronous Buck Converter
SGM6029
PACKAGE/ORDERING INFORMATION
SPECIFIED
TEMPERATURE
RANGE
PACKAGE
DESCRIPTION
ORDERING
NUMBER
PACKAGE
MARKING
PACKING
OPTION
MODEL
XXXX
SVQ
SGM6029A (1)
SGM6029B
WLCSP-0.74×1.09-6B
WLCSP-0.74×1.09-6B
WLCSP-0.74×1.09-6B
WLCSP-0.74×1.09-6B
WLCSP-0.74×1.09-6B
-40℃ to +85℃
-40℃ to +85℃
-40℃ to +85℃
-40℃ to +85℃
-40℃ to +85℃
SGM6029AYG/TR
SGM6029BYG/TR
SGM6029CYG/TR
SGM6029DYG/TR
SGM6029EYG/TR
Tape and Reel, 3000
Tape and Reel, 3000
Tape and Reel, 3000
Tape and Reel, 3000
Tape and Reel, 3000
XXXX
SVR
XXXX
SVS
SGM6029C
XXXX
SVT
SGM6029D (1)
SGM6029E (1)
XXXX
SVU
NOTE: 1. Product Preview.
MARKING INFORMATION
NOTE: XXXX = Date Code, Trace Code and Vendor Code.
X X X X
Vendor Code
Trace Code
Date Code - Year
Green (RoHS & HSF): SG Micro Corp defines "Green" to mean Pb-Free (RoHS compatible) and free of halogen substances. If
you have additional comments or questions, please contact your SGMICRO representative directly.
DEVICE DESCRIPTION
Selectable
Output Voltages
with RVSEL
Function
VSEL/MODE
IOUT
(A)
fSW
(MHz)
Soft-Start
tSS (µs) Discharge
Output
Device
Fixed VOUT (V)
0.7
0.4V ~ 0.775V
in 25mV steps
SGM6029A
SGM6029B
SGM6029C
SGM6029D
SGM6029E
VSEL + MODE
VSEL + MODE
VSEL + MODE
VSEL + MODE
VSEL + MODE
1
1
4.0
4.0
4.0
1.5
1.5
200
200
400
200
200
Yes
Yes
Yes
Yes
Yes
(VSEL/MODE = GND)
1.2
0.8V ~ 1.55V
in 50mV steps
(VSEL/MODE = GND)
1.8
1.8V ~ 3.3V
in 100mV steps
1
(VSEL/MODE = GND)
0.7
0.4V ~ 0.775V
in 25mV steps
0.6
0.6
(VSEL/MODE = GND)
1.2
0.8V ~ 1.55V
in 50mV steps
(VSEL/MODE = GND)
SG Micro Corp
www.sg-micro.com
SEPTEMBER 2022
2
Ultra-Low Quiescent Current,
Synchronous Buck Converter
SGM6029
ABSOLUTE MAXIMUM RATINGS
RECOMMENDED OPERATING CONDITIONS
Input Voltage Range, VIN..................................1.95V to 5.5V
Output Current, IOUT (MAX)
VIN Voltage.......................................................... -0.3V to 6V
SW Voltage...............................................-0.3V to VIN + 0.3V
SW (AC), Less than 10ns, while Switching Voltage
................................................................................ -1V to 8V
EN, VSEL/MODE Voltages.......................-0.3V to VIN + 0.3V
VOS Voltage........................................................ -0.3V to 5V
Package Thermal Resistance
SGM6029A/SGM6029B/SGM6029C, VIN ≥ 2.3V............ 1A
SGM6029A/SGM6029B/SGM6029C, VIN < 2.3V......... 0.7A
SGM6029D/SGM6029E .............................................. 0.6A
Effective Inductance, L
SGM6029A/B/C....................0.33µH to 1µH, 0.47µH (TYP)
SGM6029D/SGM6029E ........0.7µH to 1.2µH, 1.0µH (TYP)
Effective Output Capacitance, COUT
WLCSP-0.74×1.09-6B, θJA....................................... 214℃/W
Junction Temperature.................................................+150℃
Storage Temperature Range .......................-65℃ to +150℃
Lead Temperature (Soldering, 10s)............................+260℃
ESD Susceptibility
SGM6029A/SGM6029B/SGM6029C............... 5µF to 10µF
SGM6029D/SGM6029E .................................. 5µF to 10µF
Effective Input Capacitance, CIN...........2.2µF to 4.7µF (TYP)
External Parasitic Capacitance at VSEL/MODE Pin, CVSEL/MODE
........................................................................... 30pF (MAX)
Resistance Range for External Resistor at VSEL/MODE Pin
(E96 1% Resistor Values), RVSEL....................10kΩ to 249kΩ
External Resistor Tolerance E96 Series at VSEL/MODE Pin
HBM.............................................................................4000V
CDM ............................................................................1000V
OVERSTRESS CAUTION
Stresses beyond the limits listed in Absolute Maximum
Ratings may cause permanent damage to the device.
Exposureto absolute maximum rating conditions for extended
periods may affect device reliability. Functional operation of
the device at any conditions beyond those indicated in the
Recommended Operating Conditions section is not implied.
.............................................................................. 1% (MAX)
E96 Resistor Series Temperature Coefficient (TC)
...................................................-200ppm/℃ to +200ppm/℃
Operating Junction Temperature Range ..... -40℃ to +125℃
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 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.
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
SEPTEMBER 2022
3
Ultra-Low Quiescent Current,
Synchronous Buck Converter
SGM6029
PIN CONFIGURATION
(TOP VIEW)
1
2
A
B
C
GND
VOS
VIN
SW
EN
VSEL/
MODE
WLCSP-0.74×1.09-6B
PIN DESCRIPTION
PIN
NAME
I/O
DESCRIPTION
A1
GND
G
Ground Pin. Connect the CIN and COUT ground terminals close to this pin.
Output Voltage Sense Input. This pin is internally connected to the feedback loop and a MOSFET to
discharge the output (VOUT) when the device is disabled. Connect it with a short trace to the output
capacitor.
A2
VOS
I
B1
B2
VIN
SW
P
Power Supply Input. Connect a ceramic capacitor (CIN) close to this pin and GND.
Switching Node Output. Connect it to the filter inductor.
O
Connect an accurate resistor between this pin and GND to select one of the 16 preset output voltage
values. An R2D converter is only enabled during startup to read this resistor. After startup, this pin
acts as MODE input. A logic high sets the device in the FPWM mode and a logic low selects the
power-save mode operation.
Active High Enable Input. Apply a logic high voltage to enable the device or a logic low to disable it.
During the initial phase of startup, an internal 570kΩ pull-down resistor is temporarily connected to
the EN input. The pull-down resistor is removed after all internal circuits are powered up and
functional.
C1
C2
VSEL/MODE
EN
I
I
NOTE: I = input, O = output, P = power, G = ground.
SG Micro Corp
www.sg-micro.com
SEPTEMBER 2022
4
Ultra-Low Quiescent Current,
Synchronous Buck Converter
SGM6029
ELECTRICAL CHARACTERISTICS
(VIN = 3.6V, TJ = +-40℃ to +125℃, typical values are at TJ = +25℃, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Power Supplies
Input Voltage Range
VIN
1.95
5.5
5.5
V
VEN = VIN, IOUT = 0µA, VOUT = 1.2V,
device not switching
VEN = VIN, IOUT = 0µA, VOUT = 1.2V,
device switching
2.3
2.8
Quiescent Current (Power-Save Mode)
µA
IQ
VEN = VIN, IOUT = 0mA, VOUT = 1.2V,
VSEL/MODE = VIN (after power-up),
device switching
EN = GND, shutdown current into VIN,
VSEL/MODE = GND, TJ = -40℃ to +85℃
Quiescent Current (PWM Mode)
Shutdown Current
8.5
mA
ISD
120
250
nA
V
Under-Voltage Lockout Threshold
Input EN
VUVLO
VIN rising
1.76
1.95
High Level Input Voltage
VIH
VIL
IIN
0.85
0.89
V
V
Low Level Input Voltage
0.40
100
Input Bias Current
10
nA
kΩ
EN = high, TJ = -40℃ to +85℃
Internal Pull-Down Resistance
Input VSEL/MODE
RPD
EN = low
570
High Level Input Voltage (Digital Input)
Low Level Input Voltage (Digital Input)
Input Bias Current
VIH
VIL
IIN
V
V
0.40
130
EN = high
10
nA
Power Switches
Leakage Current into SW Pin
High-side MOSFET On-Resistance
Low-side MOSFET On-Resistance
High-side MOSFET Switch Current Limit
Low-side MOSFET Switch Current Limit
ILKG_SW
RDSON
1
50
nA
V
SW = 1.2V, TJ = -40℃ to +85℃
IOUT = 100mA
IOUT = 100mA
TJ = +25℃
185
125
1.78
1.20
310
230
1.98
1.50
mΩ
1.58
0.90
ILIMF
A
TJ = +25℃
EN = GND, ISW = -10mA into SW pin,
MOSFET On-Resistance
Bias Current into VOS Pin
RDSCH_SW
IIN_VOS
4
11
Ω
TJ = -40℃ to +85℃
EN = VIN, VOUT = 1.2V (internal 7MΩ resistor
divider), TJ = -40℃ to +85℃
250
450
nA
Thermal Protection
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
Output
TSD
Rising junction temperature, PWM mode
160
20
℃
℃
THYS
SGM6029A/SGM6029D, 25mV steps
SGM6029B/SGM6029E, 50mV steps
SGM6029C, 100mV steps
Power-Save mode
0.4
0.8
1.8
0.775
1.55
3.3
Output Voltage Range
VOUT
V
0.5
0
Output Voltage Accuracy
%
-2
2
PWM mode, IOUT = 0mA
SG Micro Corp
www.sg-micro.com
SEPTEMBER 2022
5
Ultra-Low Quiescent Current,
Synchronous Buck Converter
SGM6029
ELECTRICAL CHARACTERISTICS (continued)
(VIN = 3.6V, TJ = +-40℃ to +125℃, typical values are at TJ = +25℃, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
SGM6029A/SGM6029B/SGM6029C
SGM6029D/SGM6029E
MIN
TYP
4
MAX
UNITS
Switching Frequency
fSW
MHz
1.5
Delay from EN low to high transition until
device starts switching, VSEL = 16
SGM6029A/SGM6029B/SGM6029D/SGM6029E,
VOUT rising from 0V to 0.95% × VOUT nominal
SGM6029C,
Regulator Startup Delay Time
Soft-Start Time
tSTARTUP_DELAY
700
200
410
1170
500
785
µs
µs
tSS
VOUT rising from 0V to 0.95% × VOUT nominal
OUTPUT VOLTAGE SETTING
Table 1. Selecting the Programming Resistor (RVSEL) for Output Voltage Setting (VSEL/MODE Pin)
Output Voltage Setting VOUT (V)
VSEL
RVSEL Resistance (E96, 1%, TC ≤ ±200ppm/℃)
SGM6029A/
SGM6029D
SGM6029B/
SGM6029E
SGM6029C
0
1
0.700
0.400
0.425
0.450
0.475
0.500
0.525
0.550
0.575
0.600
0.625
0.650
0.675
0.700
0.725
0.750
0.775
1.2
0.8
1.8
1.8
1.9
2.0
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.9
3.0
3.1
3.2
3.3
Short to GND
10.0kΩ
2
0.85
0.9
12.1kΩ
3
15.4kΩ
4
0.95
1.0
18.7kΩ
5
23.7kΩ
6
1.05
1.1
28.7kΩ
7
36.5kΩ
8
1.15
1.2
44.2kΩ
9
56.2kΩ
10
11
12
13
14
15
16
1.25
1.3
68.1kΩ
86.6kΩ
1.35
1.4
105.0kΩ
133.0kΩ
162.0kΩ
205.0kΩ
249.0kΩ or larger
1.45
1.5
1.55
SG Micro Corp
SEPTEMBER 2022
www.sg-micro.com
6
Ultra-Low Quiescent Current,
Synchronous Buck Converter
SGM6029
TYPICAL PERFORMANCE CHARACTERISTICS
TA = +25℃, L = 0.47μH for SGM6029A/SGM6029B/SGM6029C, L = 1μH for SGM6028D/SGM6029E, unless otherwise noted.
SGM6029B PSM Efficiency vs. Load Current
VOUT = 0.8V
SGM6029B PSM Efficiency vs. Load Current
VOUT = 1.2V
90
85
80
75
70
65
60
55
50
90
85
80
75
70
65
60
55
50
VIN = 2.5V
VIN = 2.5V
V
IN = 3.3V
V
IN = 3.3V
VIN = 3.7V
VIN = 3.7V
V
V
V
IN = 4.3V
IN = 4.7V
IN = 5.1V
V
V
V
IN = 4.3V
IN = 4.7V
IN = 5.1V
VIN = 5.5V
VIN = 5.5V
0.001
0.01
0.1
1
1
1
0.001
0.01
0.1
1
1
1
Load Current (A)
Load Current (A)
SGM6029B PSM Efficiency vs. Load Current
VOUT = 1.5V
SGM6029B PWM Efficiency vs. Load Current
VOUT = 1.2V
90
85
80
75
70
65
60
55
50
90
80
70
60
50
40
30
20
10
0
VIN = 2.5V
V
IN = 3.3V
VIN = 3.7V
VIN = 2.5V
V
V
V
IN = 4.3V
IN = 4.7V
IN = 5.1V
V
IN = 3.3V
VIN = 3.6V
V
V
IN = 4.2V
IN = 5V
VIN = 5.5V
0.001
0.01
0.1
0.001
0.01
0.1
Load Current (A)
Load Current (A)
SGM6029C PSM Efficiency vs. Load Current
VOUT = 1.8V
SGM6029C PSM Efficiency vs. Load Current
VOUT = 2.5V
100
95
90
85
80
75
70
65
60
100
95
90
85
80
75
70
65
60
VIN = 2.5V
VIN = 3V
V
IN = 3.3V
V
IN = 3.3V
VIN = 3.6V
VIN = 3.6V
V
V
IN = 4.2V
IN = 5V
V
V
IN = 4.2V
IN = 5V
0.001
0.01
0.1
0.001
0.01
0.1
Load Current (A)
Load Current (A)
SG Micro Corp
www.sg-micro.com
SEPTEMBER 2022
7
Ultra-Low Quiescent Current,
Synchronous Buck Converter
SGM6029
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
TA = +25℃, L = 0.47μH for SGM6029A/SGM6029B/SGM6029C, L = 1μH for SGM6028D/SGM6029E, unless otherwise noted.
SGM6029C PSM Efficiency vs. Load Current
VOUT = 3.3V
SGM6029C PWM Efficiency vs. Load Current
VOUT = 2.5V
100
95
90
85
80
75
70
65
60
100
90
80
70
60
50
40
30
20
10
0
VIN = 3V
VIN = 3.6V
V
IN = 3.3V
V
IN = 3.8V
VIN = 4.2V
IN = 5V
VIN = 3.6V
V
V
IN = 4.2V
IN = 5V
V
0.001
0.01
0.1
1
0.001
0.01
0.1
1
Load Current (A)
Load Current (A)
SGM6029C PSM Output Voltage vs. Load Current
SGM6029C PWM Output Voltage vs. Load Current
1.817
1.812
1.807
1.802
1.797
1.792
1.787
1.782
1.817
1.812
1.807
1.802
1.797
1.792
1.787
1.782
VOUT = 1.8V
VIN = 2.5V
IN = 3.3V
VIN = 3.6V
VOUT = 1.8V
VIN = 2.5V
IN = 3.3V
VIN = 3.6V
V
V
V
V
IN = 4.2V
IN = 5V
V
V
IN = 4.2V
IN = 5V
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
Load Current (A)
Load Current (A)
Quiescent Current vs. Temperature
VIN = 3.6V
Shutdown Current vs. Temperature
VIN = 3.6V
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
450
400
350
300
250
200
150
100
50
0
-40 -25 -10
5
20 35 50 65 80 95 110 125
-40 -25 -10
5
20 35 50 65 80 95 110 125
Temperature (℃)
Temperature (℃)
SG Micro Corp
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SEPTEMBER 2022
8
Ultra-Low Quiescent Current,
Synchronous Buck Converter
SGM6029
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
TA = +25℃, L = 0.47μH for SGM6029A/SGM6029B/SGM6029C, L = 1μH for SGM6028D/SGM6029E, unless otherwise noted.
High-side MOSFET On-Resistance vs. Temperature
VIN = 3.6V
Low-side MOSFET On-Resistance vs. Temperature
VIN = 3.6V
300
250
200
150
100
50
200
180
160
140
120
100
80
60
40
20
0
0
-40 -25 -10
5
20 35 50 65 80 95 110 125
-40 -25 -10
5
20 35 50 65 80 95 110 125
Temperature (℃)
Temperature (℃)
MOSFET On-Resistance vs. Temperature
VIN = 3.6V
9
8
7
6
5
4
3
2
1
0
-40 -25 -10
5
20 35 50 65 80 95 110 125
Temperature (℃)
SG Micro Corp
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SEPTEMBER 2022
9
Ultra-Low Quiescent Current,
Synchronous Buck Converter
SGM6029
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
TA = +25℃, L = 0.47μH for SGM6029A/SGM6029B/SGM6029C, L = 1μH for SGM6028D/SGM6029E, unless otherwise noted.
SGM6029C Output Voltage Ripple
SGM6029C Output Voltage Ripple
VSW
VSW
AC Coupled, BW = 20MHz
AC Coupled, BW = 20MHz
VRIPPLE
VRIPPLE
IL
IL
VIN = 3.6V, VOUT = 1.8V, ILOAD = 5mA, PSM
VIN = 3.6V, VOUT = 1.8V, ILOAD = 50mA, PSM
Time (10μs/div)
Time (2μs/div)
SGM6029C Output Voltage Ripple
SGM6029C Output Voltage Ripple
VSW
VRIPPLE
IL
VSW
VRIPPLE
IL
AC Coupled, BW = 20MHz
AC Coupled, BW = 20MHz
VIN = 3.6V, VOUT = 1.8V, ILOAD = 500mA, PWM/PSM
VIN = 3.6V, VOUT = 1.8V, ILOAD = 0A, PWM
Time (1μs/div)
Time (1μs/div)
SGM6029C Load Transition
SGM6029C Load Transition
VSW
VSW
AC Coupled, BW = 20MHz
AC Coupled, BW = 20MHz
VRIPPLE
VRIPPLE
ILOAD
ILOAD
VIN = 3.6V, VOUT = 1.8V,
ILOAD = 0mA to 100mA, PSM
VIN = 3.6V, VOUT = 1.8V,
ILOAD = 0mA to 50mA, PSM
Time (25μs/div)
Time (25μs/div)
SG Micro Corp
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SEPTEMBER 2022
10
Ultra-Low Quiescent Current,
Synchronous Buck Converter
SGM6029
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
TA = +25℃, L = 0.47μH for SGM6029A/SGM6029B/SGM6029C, L = 1μH for SGM6028D/SGM6029E, unless otherwise noted.
SGM6029C Load Transition
SGM6029C Load Sweep
VSW
VSW
AC Coupled, BW = 20MHz
AC Coupled, BW = 20MHz
VRIPPLE
VRIPPLE
ILOAD
ILOAD
VIN = 3.6V, VOUT = 1.8V, ILOAD = 1mA to 500mA, PWM
VIN = 3.6V, VOUT = 1.8V, ILOAD = 0mA to 1000mA, PSM/PWM
Time (50μs/div)
Time (5ms/div)
SGM6029C Line Transition
AC Coupled, BW = 20MHz
SGM6029C Line Transition
AC Coupled, BW = 20MHz
VRIPPLE
VRIPPLE
VSW
VSW
VIN
VIN
IL
IL
VIN = 3.2V to 4.2V, VOUT = 1.8V, ILOAD = 500mA, PSM
VIN = 3.2V to 4.2V, VOUT = 2.5V, ILOAD = 5mA, PSM
Time (100μs/div)
Time (100μs/div)
SGM6029C Startup Delay Time
SGM6029C Startup Delay Time
VOUT
VOUT
VSEL
VSEL
VEN
VSW
VEN
VSW
VSEL = 0, ILOAD = 0mA
VSEL = 1, ILOAD = 0mA
Time (150μs/div)
Time (150μs/div)
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Ultra-Low Quiescent Current,
Synchronous Buck Converter
SGM6029
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
TA = +25℃, L = 0.47μH for SGM6029A/SGM6029B/SGM6029C, L = 1μH for SGM6028D/SGM6029E, unless otherwise noted.
SGM6029C Startup Delay Time
SGM6029C Startup Delay Time
VOUT
VOUT
VSEL
VSEL
VEN
VSW
VEN
VSW
VSEL = 8, ILOAD = 0mA
VSEL = 16, ILOAD = 0mA
Time (150μs/div)
Time (150μs/div)
SGM6029C Output Discharge
VSW
IIN
VEN
VOUT
VIN = 3.6V, VOUT = 3.3V, ILOAD = 0mA, PSM
Time (50μs/div)
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Ultra-Low Quiescent Current,
Synchronous Buck Converter
SGM6029
FUNCTIONAL BLOCK DIAGRAM
VIN
HS Current
Limit
ON
EN
Digital Control
EN and
CIN
OFF
VIN UVLO
Mode control
SW
L
PWM and
PFM Control
On-Timer
Pulldown
Gate
Drive
Control
100% Duty
COUT
570kΩ
Protection
LS Current
Limit
OTP
HS & LS
Current Limit
Discharge
Control
VOUT
COT
Comparator
Feedback
Network
R2D
Converter
VSEL/MODE
-
+
+
4Ω
VFB
Soft-
Start
VFB
UVLO
EN
PSM or
FPWM
Operation
VREF
VOS
VOUT
GND
Figure 2. Block Diagram
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Ultra-Low Quiescent Current,
Synchronous Buck Converter
SGM6029
DETAILED DESCRIPTION
Overview
Enable Control and Shutdown Mode (EN
Pin)
The SGM6029 family is a low quiescent current and
high frequency synchronous Buck converter. It offers
high efficiency over a wide load range including very
low output currents in the power-save mode. It can be
set to forced-PWM mode or automatic power-save
mode/PWM mode. It features seamless and automatic
transitions between power-save mode and PWM mode
based on the inductor current continuity (CCM or DCM).
The controllers have combined benefits of the
hysteretic and voltage mode control and provide very
low output ripple, outstanding DC and AC regulation
and excellent transient response. Other than the
accurate DC voltage feedback loop, the AC deviations
of the output are also sensed by the VOS pin and are
fed back to a second loop that controls the ramp signal
of the comparator in the modulator stage. This
arrangement provides fixed operation frequency in
steady state but quickly changes the frequency upon a
dynamic load change for instant response. The
controller is internally compensated and is stable with
low ESR output ceramic capacitors. These converters
are perfect for the applications that require high
efficiency at very light loads like small battery operated
systems.
A logic low on the EN input will disable (shut down) the
device and a high logic turns it on. To avoid problems
caused by insufficient EN pull-down or floating during
startup, such as weak pull-down at low voltage startup
conditions, an internal 570kΩ resistor pulls this pin to
GND during startup. This pull-down resistor is removed
when the internal circuit and the reference have been
powered up and stabilized. If the EN pin goes low, the
SGM6029 is disabled and the internal pull-down
resistor will connect.
Internal Soft-Start
If VIN voltage is in the operating range, when the EN is
pulled high, the device is powered up and initialized
within the startup delay time (tSTARTUP_DELAY). Then the
converter starts to switch and the output voltage ramps
up during the soft-start time (tSS) as shown in Figure 3.
The tSTARTUP_DELAY duration depends on the selected
output voltage (VSEL). It is the shortest when VSEL = 0
and the longest when VSEL = 16.
EN
VIN Under-Voltage Lockout Protection
(UVLO)
Device starts switching
and ramps VOUT
To avoid device malfunctioning when the VIN voltage is
insufficient and for proper powering of the whole
internal circuit, the input supply is constantly monitored
to make sure it is above the under-voltage lockout
(UVLO) threshold. When the device re-enters operation
from UVLO status (VIN rising), it will act like being
enabled. Every time the device is disabled and enabled,
a startup sequence with VSEL R2D converter will
occur.
VOUT
tSTARTUP_DELAY
tSS
Figure 3. SGM6029 Startup Timings
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Ultra-Low Quiescent Current,
Synchronous Buck Converter
SGM6029
DETAILED DESCRIPTION (continued)
device is disabled, a resistor (4Ω, TYP) is connected
between the converter output and GND through the
VOS pin as soon as the device is disabled. The output
voltage discharge feature is present only after enabling
the device for the first time after the input supply is
applied. It is not active if the device is disabled and then
power supply is applied. To keep this feature active, the
supply voltage must remain above the UVLO falling
threshold (VIN > VTH_UVLO-).
The VSEL/MODE Pin
VSEL/MODE is a dual-role pin. During startup, this pin
acts as VSEL input and senses the connected resistor
value for output voltage selection. After startup, it
functions as MODE selection input to set the device
operating mode in the forced-PWM (high) or
power-save mode (low). See the Device Comparison
Table and the VSEL resistor values (Table 1) for details.
Resistor to Digital (R2D) Converter and Selection of
the Output Voltage
Power-Save Mode Operation
An external resistor (RVSEL) placed between the
VSEL/MODE pin and GND determines the output
voltage. After enabling the device and when the internal
reference is stable, the resistor to digital (R2D)
converter starts sensing the RVSEL before the
tSTARTUP_DELAY ends. A current is injected in the RVSEL
and an ADC reads the resulting voltage. Based on the
sensed voltage, one of the preset internal feedback
resistor dividers is chosen to set the output voltage.
After completing R2D conversion, current injection is
stopped and no current flows out of the VSEL/MODE
pin. The output voltage is selected and fixed once and
during startup only. Make sure there is no other
external current leakage or capacitance (>30pF)
present on this pin during VSEL detection or UVLO
events to avoid wrong VOUT setting. Use the E96
resistor values with maximum 1% tolerance and good
The SGM6029 controller has power-save mode
operation capability. With power-save mode, the
modulator can enter the pulse frequency modulation
(PFM) rather than the fixed-frequency PWM switching
at light loads. One switching pulse is applied to the LC
filter to charge the output capacitor and keep the output
regulated and then the device enters a long sleep
period while the output capacitor supplies the small
load current. During the sleep period between
successive pulses, almost all internal circuits of the
SGM6029 are turned off to minimize the quiescent
current. The length of the sleep period is longer when
the load is lighter. A higher inductor peak-current
setting can also extend the off-time duration. For the
SGM6029, the quiescent current can be reduced to the
ultra-low levels in the order of 2.3μA (TYP). Such low
quiescent current levels are achieved by integrating
high impedance feedback divider inside the device,
using a very low power voltage reference and improved
power-save mode operation. The switching frequency
is almost proportional to the load current in PFM mode.
When the load is increased, the inductor current
becomes continuous (CCM mode) and the device
automatically enters the fixed-frequency PWM.
thermal stability (TC < 200ppm/℃) to set the output
voltage as suggested in Table 1. Note that the RVSEL
does not affect the output accuracy.
Shorting VSEL to GND sets the default output voltage
(SGM6029A/SGM6029D
=
0.7V,
SGM6029B/
SGM6029E = 1.2V, SGM6029C = 1.8V) and saves
more space by reducing one external resistor.
The nominal PWM switching frequency for SGM6029A/
SGM6029B/SGM6029C is fSW = 4.0MHz and for
SGM6029D/SGM6029E is fSW = 1.5MHz. However, the
exact frequency depends on VIN and VOUT. The change
between PFM and PWM occurs when the inductor
current becomes marginally discontinued (valley
current reaches zero). Using a unified controller to
manage PFM and PWM operations, this device can
seamlessly change mode with minimum output voltage
ripple due to the mode change.
Power-Save Mode and Forced-PWM (FPWM)
Operation Mode Selection
After the power-up period, the VSEL/MODE pin acts as
mode select input. A logic low applied to this input
selects the power-save mode and a logic high selects
FPWM operation. Changing the mode during operation
(after completing VSEL function) is allowed.
Output Voltage Discharge
To ensure that the output voltage drops to 0V in a
controlled manner and remains close to 0V while the
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Ultra-Low Quiescent Current,
Synchronous Buck Converter
SGM6029
DETAILED DESCRIPTION (continued)
and low-side MOSFET switch currents are monitored
and limited in a cycle-by-cycle basis. If the high-side
switch current exceeds its limit, it will be turned off and
the low-side switch will be turned on to decrease the
inductor current until it falls below the low-side current
limit. At this time the low-side switch will be turned off
and the high-side switch will be turned on again.
Forced-PWM Mode (FPWM) Operation
If the FPWM mode is selected (MODE = high), the
device runs at the fixed-frequency PWM in the entire
load range. The FPWM mode reduces the light load
efficiency due to the circulating currents, but the high
frequency interference is significantly reduced due to
the wider soft switching range of the converter at light
loads and the relatively fixed-frequency spectrum of the
noise.
Thermal Shutdown Protection
To protect the device from overheating damage,
thermal protection is included in the device. If the
junction temperature (TJ) exceeds the thermal
shutdown threshold (TSD = 160℃, TYP), both switches
will be turned off. When the die cools down and TJ falls
below hysteresis window (20℃, TYP), the switching
resumes automatically after a soft-start. There is no
R2D conversion after thermal shutdown and VOUT sets
to the previous value. Also please note that there is no
thermal protection in the power-save mode.
100% Duty Cycle Operation Mode
When the voltage of the input source, such as battery,
falls and its value is close to the output voltage, the
PWM duty cycle (D = VOUT/VIN) increases to near 100%.
Eventually the high-side switch remains continuously
on to keep the output regulated. Even when the input
voltage falls below the output, the high-side switch is
turned on to minimize the error.
Short Circuit and Switch Current Limit
Protections
To prevent damage to the SGM6029 or load when an
output short circuit or over-current occurs, the high-side
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Ultra-Low Quiescent Current,
Synchronous Buck Converter
SGM6029
APPLICATION INFORMATION
A few power supply design examples for some typical application with different input and output voltage
requirements will be discussed in this section that can be used as reference. See Figure 4 and also other circuits
provided in Figure 5 to Figure 10.
Typical Application
L1
0.47μH
VIN
VOUT
0.8V to 1.55V
1.95V to 5.5V
VIN
SW
SGM6029B
VOS
CIN
4.7μF
COUT
10μF
PWM
VSEL/
MODE
PFM
EN
*
ON
RVSEL
OFF
GND
* 16 selectable VOUT
Figure 4. SGM6029B with Adjustable VOUT
Design Requirements
The components designed for this application are listed in Table 2.
Table 2. Components for Application Characteristic Curves
Designed
Description/Part Number
Value/Main Parameters
Size (L × W × T) (mm3 MAX)
Manufacturer
Component
CIN
GRT155R61A475ME13D
GRM155R61A106ME44D
4.7µF, X5R, 10V, ±20%
10µF, X5R, 10V, ±20%
0402 (1 × 0.5 × 0.5)
0402 (1 × 0.5 × 0.5)
Murata
Murata
COUT
0.47µH,
54mΩ (DCRmax @20℃),
2.6A (Imax, 40℃ rise),
3.3A (Isat, 30% L drop)
±20% (Initial Tolerance)
Inductor
DFE18SANR47MG0L
L1
0603 (1.6 × 0.8 × 1.0)
Murata
VOUT
Design Procedure
1. The VIN, VOUT and IOUT requirements must be known
to start the design.
1-
V
IN
(1)
ΔIL = VOUT
×
L×fSW
In steady state, the maximum inductor current can be
calculated from Equation 2.
2. For each application, the design can be optimized for
efficiency, solution size or other factors.
ΔIL
(2)
IL_MAX = IOUT_MAX
+
3. Compare your design with solutions provided by
SGMICRO.
2
Where, f is switching frequency, L is inductance value,
ΔIL is the inductor peak-to-peak ripple current and IL_MAX
is the peak inductor current. The maximum current
should never reach the inductor saturation level. This
situation can happen after a large load step. A common
conservative option is to choose an inductor with a
saturation current equal to or higher than the high-side
switch current limit (ILIMF).
Inductor Selection
The inductance of the output filter (L) determines the
peak-to-peak ripple current and indirectly affects the
converter efficiency and output voltage ripple. It also
determines the current at which the PWM-to-PFM
transition occurs (CCM to DCM). The ripple current (ΔIL)
can be estimated from Equation 1. It shows that ΔIL
decreases with larger inductance values and increases
at higher voltage levels (VIN or VOUT).
Some of the inductor part numbers that satisfy these
conditions are listed in Table 3.
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Ultra-Low Quiescent Current,
Synchronous Buck Converter
SGM6029
APPLICATION INFORMATION (continued)
Table 3. A List of Inductors Suitable for this Application
Inductance (µH)
0.47
Part Number/Series
DFE18SANR47ME0
DFE18SANR47MG0L
DFE201210U-R47M
DFE201210U-1R0M
HTEK12100F-R47MSR
HTEL1412FE-R47MSR
HTEL16080H
Size Imperial (Metric)
0603(1608)
0603(1608)
0805(2012)
0805(2012)
0504(1210)
0505(1412)
0603(1608)
0805(2012)
0805(2013)
Size (L × W × T) (mm3 MAX)
1.6 × 0.8 × 1.0
Manufacturer
Murata
0.47
1.6 × 0.8 × 1.0
Murata
0.47
2.0 × 1.2 × 1.0
Murata
1.0
2.0 × 1.2 × 1.1
Murata
0.47
1.2 × 1.0 × 0.6
Cyntec
0.47
1.4 × 1.2 × 0.65
1.6 × 0.8 × 0.8
Cyntec
0.47/1.0
1.0
Cyntec
HTEG20120G-1R0MDR
HTEP20120H
2.0 × 1.2 × 0.7
Cyntec
0.47/1.0
1.6 × 0.8 × 0.8
Cyntec
Input Capacitor (CIN)
A low ESR ceramic capacitor must be connected close to the VIN and GND pins to provide the pulsating input
current of the converter and minimize switching noise and ringings. A 4.7μF ceramic capacitor is satisfactory for
most applications, however, if a high impedance source such as a coin cell-battery is used, larger input capacitance
(CIN ≥ 10μF) is preferred to prevent voltage drops during startup or load steps. There is no high limit for the input
capacitance, however, note that the higher leakage current of a large input capacitor will increase the total quiescent
current of the power supply.
Some applicable input capacitors are listed in Table 4.
Table 4. Some Potential Part Numbers for the Input Capacitor
Capacitance (μF)
Capacitor Part Number
GRM155R60J106ME
GRM188R61A106M
Size Imperial (Metric)
0402(1005)
Size (L × W × T) (mm3 MAX)
1.0 × 0.5 × 0.5
Manufacturer
Murata
10
10
10
0603(1608)
1.6 × 0.8 × 0.8
Murata
GRM188B30J106ME47
0603(1609)
1.6 × 0.8 × 0.9
Murata
Output Capacitor (COUT
)
Table 5. Proper Output Capacitor and Inductor Combination
Table 5 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 can 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.
Device
L1
0.47µH/1µH
1µH
COUT
10µF
10µF
SGM6029A/SGM6029B/SGM6029C
SGM6029D/SGM6029E
L1 = 0.47µH or 1µH and COUT = 10µF are the
recommended values for the typical application of
SGM6029A/SGM6029B/SGM6029C. L1 = 1µH and
COUT = 10µF are the recommended values for the
typical application of SGM6029D/SGM6029E.
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Ultra-Low Quiescent Current,
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SGM6029
APPLICATION INFORMATION (continued)
L1
0.47μH
VIN
VOUT
0.8V to 1.55V
1.95V to 5.5V
VIN
SW
SGM6029B
VOS
CIN
4.7μF
COUT
10μF
PWM
VSEL/
MODE
PFM
EN
*
ON
RVSEL
OFF
GND
* 16 selectable VOUT
Figure 5. RVSEL Selectable VOUT (0.8V to 1.55V) with SGM6029B
L1
VIN
0.47μH
1.2V fixed VOUT
1.95V to 5.5V
VIN
EN
SW
SGM6029B
VOS
CIN
4.7μF
COUT
10μF
VSEL/
MODE
ON
OFF
GND
Figure 6. Fixed 1.2V Output with SGM6029B (VSEL is Grounded)
L1
VIN
0.47μH
V
OUT = 3.3V
up to 5.5V
VIN
EN
SW
SGM6029C
VOS
CIN
4.7μF
COUT
10μF
PWM
VSEL/
MODE
PFM
RVSEL
249kΩ
ON
OFF
GND
Figure 7. Adjustable Output Set to 3.3V with SGM6029C
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Ultra-Low Quiescent Current,
Synchronous Buck Converter
SGM6029
APPLICATION INFORMATION (continued)
L1
VIN
0.47μH
1.8V fixed VOUT
1.95V to 5.5V
VIN
SW
SGM6029C
VOS
CIN
COUT
VSEL/
MODE
4.7μF
10μF
EN
ON
OFF
GND
Figure 8. Fixed 1.8V Output with SGM6029C (VSEL is Grounded)
VOUT
0.4V to 0.775V
IOUT up to 600mA
L1
1μH
VIN
1.95V to 5.5V
VIN
EN
SW
SGM6029D
VOS
CIN
4.7μF
COUT
10μF
PWM
VSEL/
MODE
PFM
*
ON
RVSEL
OFF
GND
* 16 selectable VOUT
Figure 9. RVSEL Selectable VOUT (0.4V to 0.775V) with SGM6029D
L1
1μH
VIN
0.7V fixed VOUT
IOUT up to 600mA
1.95V to 5.5V
VIN
EN
SW
SGM6029D
VOS
CIN
4.7μF
COUT
10μF
VSEL/
MODE
ON
OFF
GND
Figure 10. Fixed 0.7V Output with SGM6029D (VSEL Grounded)
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Ultra-Low Quiescent Current,
Synchronous Buck Converter
SGM6029
APPLICATION INFORMATION (continued)
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 SGM6029.
• Place the input capacitor close to the device with the shortest possible connection traces.
• 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.
• Keep the signal traces like the VOS sense line away from SW or other noisy sources.
Refer to Figure 11 for a recommended PCB layout.
VOUT
SW
L
COUT
RVSEL
CIN
GND
GND
VIN
Figure 11. PCB Layout
REVISION HISTORY
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Original (SEPTEMBER 2022) to REV.A
Page
Changed from product preview to production data .................................................................................................................................................All
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PACKAGE INFORMATION
PACKAGE OUTLINE DIMENSIONS
WLCSP-0.74×1.09-6B
0.19
6 × Φ
D
0.17
A1 CORNER
E
0.35
0.35
RECOMMENDED LAND PATTERN (Unit: mm)
TOP VIEW
6 × Φd
2
1
A
B
C
C
e
A
SEATING PLANE
A1
ccc C
e
SIDE VIEW
BOTTOM VIEW
Dimensions In Millimeters
Symbol
MIN
MOD
0.400
MAX
0.438
0.171
0.775
1.125
0.247
A
A1
D
0.362
0.131
0.715
1.065
0.187
0.151
0.745
E
1.095
d
0.217
e
0.350 BSC
0.050
ccc
NOTE: This drawing is subject to change without notice.
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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
WLCSP-0.74×1.09-6B
7″
9.5
0.81
1.21
0.50
4.0
4.0
2.0
8.0
Q1
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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
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TX20000.000
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