SGM3838 [SGMICRO]
Triple-Output 700mA AMOLED Display Power Supply;
| 型号： | SGM3838 |
| 厂家： | 
Shengbang Microelectronics Co, Ltd |
| 描述： | Triple-Output 700mA AMOLED Display Power Supply |
| 文件： | 总18页 (文件大小：983K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SGM3838
Triple-Output 700mA
AMOLED Display Power Supply
● Synchronous Inverting Buck-Boost Converter
(ELVSS)
GENERAL DESCRIPTION
The SGM3838 is designed for powering AMOLED
displays which require VELVDD, VELVSS and VAVDD. The
device integrates two Boost converters, VO1 for VELVDD
and VO3 for VAVDD, and a dual-phase inverting
Buck-Boost converter VO2 for VELVSS. Output voltages
of all the three converters can be programmed in digital
steps through the digital interface control pin (SWIRE).
-6.0V to -0.8V Output Voltage with 100mV Steps
-3.0V Default Output Voltage
1% Accuracy at -3V
700mA Output Current Capability
● Synchronous Boost Converter (AVDD)
5.5V to 7.9V Output Voltage with 100mV Steps
7.3V Default Output Voltage
0.9% Accuracy at 7.3V
The SGM3838 is available in a Green WLCSP-2.5×2.5-
36B package.
150mA Output Current Capability
● VIN and VOUT Bi-Directional Isolation
● Short Circuit Protection (SCP)
● Overload Protection
FEATURES
● 2.5V to 4.8V Input Supply Voltage Range
● Synchronous Boost Converter (ELVDD)
4.6V to 5.0V Output Voltage with 100mV Steps
4.6V Default Output Voltage
● Thermal Shutdown
● VELVSS Start-Up Delay: 5.6ms
● Short Circuit and OLP Detection Time: 0.71ms
● Available in a Green WLCSP-2.5×2.5-36B Package
0.7% Accuracy at 4.6V
700mA Output Current Capability
Output Voltage Sensing Pin for Path Loss
Compensation (FBS)
APPLICATIONS
Smartphones & Tablets
Active Matrix OLED Displays
TYPICAL APPLICATION
A3, B3
C1
VELVDD
4.6V ~ 5.0V
VO1
FBS
2.2μH
Boost
VO1
V
IN = 2.5V to 4.8V
A2, B2
A5, A6
F5, F6
SW1
22μF×2
22μF
10μF
PVIN2A
PVIN2B
10μF
C5, C6
VELVSS
-0.8V ~ -6.0V
VO2A
VO2B
Inverter
VO2
D5, D6, E4
2.2μH
2.2μH
10μF
B5, B6
E5, E6
22μF
SW2A
SW2B
SGM3838
10μH
Boost
VO3
E1
D1
F3
VAVDD
5.5V ~ 7.9V
SW3
VO3
SHT
10μF×2
10μF
10μF
C2
D4
E3
D3
AVIN
SWIRE
nFD
Internal
Analog
/Digital
Block
SHT
A1, A4, B1, F1, F4
D2, E2, F2
SWIRE
nFD
PGNDx
AGND
DGND
B4, C3, C4
VO3_EN
VO3_EN
Figure 1. Typical Application Circuit
SG Micro Corp
www.sg-micro.com
JULY 2022 – REV. A. 2
Triple-Output 700mA
SGM3838
AMOLED Display Power Supply
PACKAGE/ORDERING INFORMATION
SPECIFIED
TEMPERATURE
RANGE
PACKAGE
DESCRIPTION
ORDERING
NUMBER
PACKAGE
MARKING
PACKING
OPTION
MODEL
SGM
3838YG
XXXXX
XX#XX
SGM3838 WLCSP-2.5×2.5-36B
SGM3838YG/TR
Tape and Reel, 5000
-40℃ to +85℃
MARKING INFORMATION
NOTE: XXXXX = Trace Code. XX#XX = Coordinate Information and Wafer ID Number.
Trace Code
X X X X X
XX＃XX
Coordinate Information
Wafer ID Number ("A" = 01, "B" = 02, …"Y" = 25)
Coordinate Information
Green (RoHS & HSF): SG Micro Corp defines "Green" to mean Pb-Free (RoHS compatible) and free of halogen substances. If
you have additional comments or questions, please contact your SGMICRO representative directly.
OVERSTRESS CAUTION
ABSOLUTE MAXIMUM RATINGS
Stresses beyond those listed in Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to
absolute maximum rating conditions for extended periods
may affect reliability. Functional operation of the device at any
conditions beyond those indicated in the Recommended
Operating Conditions section is not implied.
Voltage Range (with Respect to Ground Pin)
PVIN2A, PVIN2B, AVIN, VO3_EN, SWIRE, nFD, VO1, FBS,
SHT.................................................................... -0.3V to 6V
SW1................................................................... -0.3V to 7V
SW3, VO3.......................................................... -0.3V to 9V
VO2A, VO2B...................................................... -7V to 0.3V
SW2A, SW2B........................................................ -7V to 6V
Package Thermal Resistance
ESD SENSITIVITY CAUTION
WLCSP-2.5×2.5-36B, θJA .......................................... 62℃/W
Junction Temperature.................................................+150℃
Storage Temperature Range.......................-65℃ to +150℃
Lead Temperature (Soldering, 10s)............................+260℃
ESD Susceptibility
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.............................................................................2000V
CDM ............................................................................1000V
RECOMMENDED OPERATING CONDITIONS
Operating Ambient Temperature Range ........-40℃ to +85℃
Operating Junction Temperature Range......-40℃ to +125℃
DISCLAIMER
SG Micro Corp reserves the right to make any change in
circuit design, or specifications without prior notice.
SG Micro Corp
www.sg-micro.com
JULY 2022
2
Triple-Output 700mA
SGM3838
AMOLED Display Power Supply
PIN CONFIGURATION
(TOP VIEW)
1
2
3
4
5
6
PGND1
SW1
VO1
PGND2A
PVIN2A
PVIN2A
A
B
C
D
E
F
PGND1
FBS
SW1
AVIN
VO1
DGND
VO3_EN
nFD
DGND
DGND
SWIRE
VO2B
SW2A
VO2A
SW2A
VO2A
VO3
AGND
AGND
AGND
VO2B
VO2B
SW3
SW2B
PVIN2B
SW2B
PVIN2B
PGND3
SHT
PGND2B
WLCSP-2.5×2.5-36B
PIN DESCRIPTION
PIN
A1, B1
C1
NAME
PGND1
FBS
TYPE
DESCRIPTION
G
I
VO1 Boost Converter Power Ground.
VO1 Boost Converter Output Sense Input. It should be connected to VO1 pin or to
the far-end VO1 output capacitor.
D1
VO3
O
I
VO3 Boost Converter Output.
VO3 Boost Converter Switching Node.
VO3 Boost Converter Power Ground.
VO1 Boost Converter Switching Node.
Analog Input Pin.
E1
SW3
F1
PGND3
SW1
G
I
A2, B2
C2
AVIN
I
D2, E2, F2
A3, B3
C3
AGND
VO1
G
O
G
I
Analog Ground Pin.
VO1 Boost Converter Output.
Digital Ground Pin.
DGND
VO3_EN
nFD
D3
VO3 Boost Converter Enable Pin.
Output Discharge Enable/Disable During Shutdown. Logic low level enables the
discharge and logic high level disables the discharge.
E3
I
F3
SHT
O
Fault Protection (SCP, UVLO) Status Pin.
SG Micro Corp
www.sg-micro.com
JULY 2022
3
Triple-Output 700mA
SGM3838
AMOLED Display Power Supply
PIN DESCRIPTION (continued)
PIN
A4
NAME
PGND2A
DGND
SWIRE
VO2B
TYPE
DESCRIPTION
G
G
I
Power Ground Pin.
Digital Ground Pin.
B4, C4
D4
E4
VO1/VO2 Converter Enable Pin.
O
G
I
VO2 Inverting Buck-Boost Converter B Output Pin.
Power Ground Pin.
F4
PGND2B
PVIN2A
SW2A
A5
VO2 Inverting Buck-Boost Converter A Power Supply Input Pin.
VO2 Inverting Buck-Boost Converter A Switching Node.
VO2 Inverting Buck-Boost Converter A Output Pin.
VO2 Inverting Buck-Boost Converter B Output Pin.
VO2 Inverting Buck-Boost Converter B Switching Node.
VO2 Inverting Buck-Boost Converter B Power Supply Input Pin.
VO2 Inverting Buck-Boost Converter A Power Supply Input Pin.
VO2 Inverting Buck-Boost Converter A Switching Node.
VO2 Inverting Buck-Boost Converter A Output Pin.
VO2 Inverting Buck-Boost Converter B Output Pin.
VO2 Inverting Buck-Boost Converter B Switching Node.
VO2 Inverting Buck-Boost Converter B Power Supply Input Pin.
B5
I
C5
D5
E5
VO2A
O
O
I
VO2B
SW2B
F5
PVIN2B
PVIN2A
SW2A
I
A6
I
B6
I
C6
D6
E6
VO2A
O
O
I
VO2B
SW2B
F6
PVIN2B
I
NOTE: I: input, O: output, I/O: input or output, G: ground.
SG Micro Corp
www.sg-micro.com
JULY 2022
4
Triple-Output 700mA
SGM3838
AMOLED Display Power Supply
ELECTRICAL CHARACTERISTICS
(At TJ = +25℃, VIN = 3.7V, VSWIRE = VVO3_EN = VIN, VVO1 = 4.6V, VVO2 = -3V, VVO3 = 7.3V, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX UNITS
Supply Current and Thermal Protection
Input Voltage Range
VIN
ISD
2.5
4.8
1
V
µA
mA
V
TJ = -40℃ to +85℃
Shutdown Current into PVIN, AVIN
Quiescent Current into PVIN, AVIN
VSWIRE = VVO3_EN = GND
VIN = 3.7V, no load, VSWIRE = VVO3_EN = high
VIN falling
0.5
6
IQON
VIT-
VIT+
2.10
2.23
2.35
145
135
Under-Voltage Lockout Threshold (AVIN)
Thermal Shutdown Temperature
VIN rising
2.47
V
Junction temperature rising
Junction temperature falling
℃
℃
TSD
Logic Signals (VO3_EN, SWIRE)
Logic High Level Voltage
Logic Low Level Voltage
Pull-Down Resistor (VO3_EN, SWIRE)
Logic Signal (SHT)
VH
VL
1.2
V
V
VIN = 2.7V to 4.8V, TJ = -40℃ to +85℃
VIN = 2.7V to 4.8V, TJ = -40℃ to +85℃
0.4
RDOWN
600
kΩ
Pull-Up Resistor to AVIN
Pull-Down Current
RUP
600
5.8
kΩ
IDOWN
VIN = 3.7V, output short, VSHT = 1V
mA
Boost Converter (VVO1 = VELVDD
)
4.6V to 5.0V with 0.1V/step, default 4.6V,
Positive Output 1 Voltage
4.6
4.6
5.0
V
TJ = -40℃ to +85℃
VVO1
VVO1 = 4.6V, no load
-0.7
-0.9
0.7
0.9
Positive Output 1 Voltage Accuracy
%
VVO1 = 4.6V, no load, TJ = -40℃ to +85℃
IDS = 200mA
SW1 MOSFET On-Resistance
SW1 MOSFET Rectifier On-Resistance
SW1 Switch Current Limit
SW1 Switching Frequency
Output Current Capability
Short Circuit Threshold in Operation
Threshold of Output Sense with VO1
Threshold of Output Sense with FBS
VO1 and FBS Leakage, No Discharge
Pull-Down Resistance of FBS
VO1 Discharge Resistance
VO1 Discharge Time
RDS(ON)11
RDS(ON)12
ISW1
60
mΩ
IDS = 200mA
150
2.00
1.45
Inductor valley current
IVO1 = 100mA
1.65
1.20
700
2.45
1.65
A
MHz
mA
%
fSW1
IOUT1
VIN = 2.7V to 4.8V, TJ = -40℃ to +85℃
Percentage of nominal VVO1
VVO1 - VFBS increasing
VVO1 - VFBS decreasing
VnFD = VIN, VSWIRE = GND
VVO1(SCP)
VTVO1
81
660
460
0.7
mV
mV
µA
VTFBS
ILEAK_VO1
RFBS
RVO1(DCG) VSWIRE = GND, IVO1 = 20mA
tDVO1 VSWIRE = GND
2
5
MΩ
Ω
60
10
ms
Line Regulation
VO1LINEREG IVO1 = 100mA, VIN = 2.7V to 4.5V
VO1LINEREG No load, VIN = 2.7V to 4.5V
VO1RIPPLE IVO1 = IVO2 = 0 to 150mA
VO1LOADREG 1mA ≤ IVO1 ≤ 700mA
±0.003
±0.002
10
%/V
%/V
mVPP
%/A
Line Regulation
Output Voltage Ripple
Load Regulation
±0.05
SG Micro Corp
www.sg-micro.com
JULY 2022
5
Triple-Output 700mA
SGM3838
AMOLED Display Power Supply
ELECTRICAL CHARACTERISTICS (continued)
(At TJ = +25℃, VIN = 3.7V, VSWIRE = VVO3_EN = VIN, VVO1 = 4.6V, VVO2 = -3V, VVO3 = 7.3V, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX UNITS
Buck-Boost Converter (VVO2 = VELVSS
)
-6.0V to -0.8V with 0.1V/step, default -3.0V,
Negative Output Voltage Range
Negative Output Voltage Accuracy
VVO2
-6.0
-30
-3.0
-0.8
30
V
TJ = -40℃ to +85℃
mV
VVO2 = -3V, no load, TJ = -40℃ to +85℃
SW2 MOSFET On-Resistance-Phase A
RDS(ON)A1
RDS(ON)A2
RDS(ON)B1
RDS(ON)B2
IDS = 200mA
130
120
130
120
1.25
mΩ
mΩ
SW2 MOSFET Rectifier On-Resistance-
Phase A
IDS = 200mA
IDS = 200mA
IDS = 200mA
SW2 MOSFET On-Resistance-Phase B
SW2 MOSFET Rectifier On-Resistance-
Phase B
SW2 Switching Frequency
fSW2
IOUT2
ISW2A
ISW2B
IVO2 = 100mA
1.00
700
1.50
MHz
mA
A
Output Current Capability
VIN = 2.7V to 4.8V, TJ = -40℃ to +85℃
Inductor peak current
SW2 Switch Current Limit-Phase A
SW2 Switch Current Limit-Phase B
2.35
1.30
2.65
1.65
3.00
2.00
Inductor peak current
A
Average Load Current Threshold with
Dual-Phase
Average Load Current Threshold with
Phase A Only
Short Circuit Threshold during
start-up after 20ms
IRMSA&B
IRMSA
Load current rising
260
150
82
mA
mA
%
Load current falling
VVO2(SCP)
Percentage of nominal VVO2
VO2 Discharge Resistance
VO2 Discharge Time
VO2 Leakage, No Discharge
Line Regulation
RVO2(DCG) VSWIRE = GND, IVO2 = 20mA
60
10
Ω
ms
tDVO2
VSWIRE = GND
ILEAK_VO2
VnFD = VIN, VSWIRE = GND
0.5
2
µA
VO2LINEREG IVO2 = 100mA, VIN = 2.7V to 4.5V
VO2RIPPLE IVO1 = IVO2 = 0 to 150mA
VO2LOADREG 1mA ≤ IVO2 ≤ 700mA
±0.002
10
%/V
mVPP
%/A
Output Voltage Ripple
Load Regulation
±0.05
Boost Converter (VVO3 = VAVDD
)
5.5V to 7.9V with 0.1V/step, default 7.3V,
Positive Output 2 Voltage Range
VVO3
5.5
7.3
7.9
0.9
V
TJ = -40℃ to +85℃
Positive Output 2 Voltage Accuracy
SW3 MOSFET On-Resistance
SW3 MOSFET Rectifier On-Resistance
SW3 Switch Current Limit
SW3 Switching Frequency
Output Current Capability
Short Circuit Threshold in Operation
VO3 Leakage, No Discharge
VO3 Discharge Resistance
VO3 Discharge Time
-0.9
%
VVO3 = 7.3V, no load, TJ = -40℃ to +85℃
RDS(ON)31
RDS(ON)32
ISW3
IDS = 200mA
330
500
mΩ
IDS = 200mA
Inductor peak current
IVO3 = 30mA
0.70
1.20
150
1.00
1.45
1.30
1.65
A
MHz
mA
%
fSW3
IOUT3
VIN = 2.7V to 4.8V, TJ = -40℃ to +85℃
Percentage of nominal VVO3
VnFD = VIN, VVO3_EN = GND
VVO3(SCP)
ILEAK_VO3
88
2
3
µA
RVO3(DCG) VVO3_EN = GND, IVO3 = 20mA
tDVO3 VVO3_EN = GND
140
10
Ω
ms
Line Regulation
VO3LINEREG IVO3 = 30mA, VIN = 2.7V to 4.5V
VO3RIPPLE IVO3 = 0 to 100mA
±0.01
10
%/V
mVPP
%/A
Output Voltage Ripple
Load Regulation
VO3LOADREG 1mA ≤ IVO3 ≤ 150mA
±0.18
SG Micro Corp
www.sg-micro.com
JULY 2022
6
Triple-Output 700mA
SGM3838
AMOLED Display Power Supply
TIMING REQUIREMENTS
PARAMETER
Short-Circuit Timer
SYMBOL
MIN
TYP
MAX
UNITS
VO1 Short Circuit Detection Time in Start-Up
VO1 Short Circuit Detection Time in Operation
VO2 Short Circuit Detection Time in Start-Up
VO2 Short Circuit Detection Time in Operation
VO3 Short Circuit Detection Time in Start-Up
VO3 Short Circuit Detection Time in Operation
VOx Discharge Time after SWIRE Goes Low
SWIRE Interface
1.86
0.62
5.0
2.12
0.71
5.6
2.56
0.85
6.8
tVO1(SCP)
tVO2(SCP)
0.62
0.71
2.6
0.85
ms
tVO3(SCP)
tDISCHG
0.62
0.71
10
0.85
Initialization Time
tINIT
tOFF
tHIGH
tLOW
350
55
10
10
55
450
80
20
20
80
Shutdown Time Period
35
2
Pulse High Level Time Period
μs
Pulse Low Level Time Period
2
Data Storage/Accept Time Period
Power Sequence
tSTORE
35
VO1 Start-Up Time
tSS1
tSS2
2.5
2
VO2 Start-Up Time
ms
VO2 Start-Up Time Delay after VO1
tDELAY
2.5
VIN
tLOW tHIGH
tSTORE
tOFF
tDISCHG
tINIT
tSS1
tDELAY
tSS2
SWIRE
1
2
37
4.6V
VO1
VO2
-2.4V
-3.0V
Figure 2. Timing Diagram
fast
VELVSS
12ms
12ms
fast
12ms
12ms
Figure 3. VELVSS Transition Time Control
SG Micro Corp
www.sg-micro.com
JULY 2022
7
Triple-Output 700mA
SGM3838
AMOLED Display Power Supply
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 3.7V, unless otherwise noted.
VVO1 and VVO2 Combined Efficiency vs. Output Current
VVO3 Efficiency vs. Output Current
100
80
60
40
20
0
100
80
60
40
20
0
VIN = 3.7V
VIN = 2.9V
VIN = 2.9V
VIN = 4.4V
VIN = 3.7V
VIN = 4.4V
VVO3 = 7.3V
VVO1 = 4.6V, VVO2 = -3.0V
0
200 400 600 800 1000 1200 1400
Output Current (mA)
0
0
0
30
60
90
120
150
Output Current (mA)
VVO1 Line Regulation
VVO1 Load Regulation
4.61
4.605
4.6
4.61
4.605
4.6
IOUT = 1mA
IOUT = 300mA
VIN = 3.7V
VIN = 4.5V
4.595
4.59
4.595
4.59
IOUT = 100mA
VIN = 2.9V
4.585
4.58
4.585
4.58
4.575
4.57
4.575
4.57
VVO1 = 4.6V
VVO1 = 4.6V
2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5
200 400 600 800 1000 1200 1400 1600
Input Voltage (V)
Output Current (mA)
VVO2 Line Regulation
VVO2 Load Regulation
-2.994
-2.995
-2.996
-2.997
-2.998
-2.999
-3
-2.98
-2.985
-2.99
-2.995
-3
IOUT = 1mA
IOUT = 300mA
VIN = 2.9V
VIN = 4.5V
IOUT = 100mA
VIN = 3.7V
-3.005
-3.01
-3.015
-3.02
-3.001
-3.002
VVO2 = -3.0V
VVO2 = -3.0V
2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5
200 400 600 800 1000 1200 1400
Input Voltage (V)
Output Current (mA)
SG Micro Corp
JULY 2022
www.sg-micro.com
8
Triple-Output 700mA
SGM3838
AMOLED Display Power Supply
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 3.7V, unless otherwise noted.
VVO3 Line Regulation
VVO3 Load Regulation
7.31
7.305
7.3
7.31
7.305
7.3
VIN = 4.5V
VIN = 2.9V
IOUT = 1mA
IOUT = 150mA
7.295
7.29
7.295
7.29
VIN = 3.7V
IOUT = 50mA
7.285
7.28
7.285
7.28
7.275
7.27
7.275
7.27
VVO3 = 7.3V
125 150
VVO3 = 7.3V
2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5
0
25
50
75
100
Input Voltage (V)
Output Current (mA)
VVO1 and VVO2 Combined Maximum Output Current vs. Input Voltage
1600
Startup Sequence
5V/div
5V/div
VIN
VVO1 = 4.6V, VVO2 = -3.0V
1400
1200
1000
800
600
400
200
0
SWIRE
5V/div
5V/div
5V/div
VO3_EN
VO1
VIN = 3.7V, VSWIRE = 0V to 3.7V,
VO3_EN = 0V to 3V, VnFD = GND,
V
VVO1 = 4.6V, VVO2 = -5.4V
VO2
VO3
VVO1 = 4.6V, VVO2 = -3.0V,
VVO3 = 7.3V, ILOAD = 0mA
VVO1 = 4.6V, VVO2 = -4.0V
5V/div
200mA/
div
IIN
2.5 2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5
Input Voltage (V)
Time (10ms/div)
Shutdown Sequence Discharge = ON
Shutdown Sequence Discharge = OFF
VIN
VIN
5V/div
5V/div
5V/div
VIN = 3.7V, VSWIRE = VVO3_EN = 3.7V to 0V, VnFD = VIN,
VVO1 = 4.6V, VVO2 = -3.0V, VVO3 = 7.3V, ILOAD = 0mA
VIN = 3.7V, VSWIRE = VVO3_EN = 3.7V to 0V, VnFD = GND,
VVO1 = 4.6V, VVO2 = -3.0V, VVO3 = 7.3V, ILOAD = 0mA
VO3_EN
SWIRE
VO3_EN
SWIRE
5V/div
VO3
VO1
VO1
VO3
5V/div
5V/div
5V/div
5V/div
5V/div
2V/div
VO2
VO2
Time (5ms/div)
Time (50s/div)
SG Micro Corp
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JULY 2022
9
Triple-Output 700mA
SGM3838
AMOLED Display Power Supply
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 3.7V, unless otherwise noted.
Line Transient at Light Load
Line Transient at Moderate Load
VIN = 3.7V to 4.2V, VVO1 = 4.6V, VVO2 = -3.0V, VVO3 = 7.3V,
IVO1 = 10mA, IVO2 = 10mA, IVO3 = 5mA
VIN = 3.7V to 4.2V, VVO1 = 4.6V, VVO2 = -3.0V, VVO3 = 7.3V,
I
VO1 = 100mA, IVO2 = 100mA, IVO3 = 30mA
VIN
500mV/
div
VIN
500mV/
div
10mV/
div
VO1
10mV/
div
VO1
20mV/
div
20mV/
div
VO2
VO3
VO2
VO3
20mV/
div
20mV/
div
Time (100μs/div)
Time (100μs/div)
Line Transient at Heavy Load
VO1 Load Transient
VIN = 3.7V to 4.2V, VVO1 = 4.6V, VVO2 = -3.0V, VVO3 = 7.3V,
VIN = 3.7V, VVO1 = 4.6V, ILOADVO1 = 10mA to 700mA
I
VO1 = 500mA, IVO2 = 500mA, IVO3 = 100mA
500mV/
div
VIN
VO1
100mV/
div
20mV/
div
VO1
20mV/
div
VO2
VO3
500mA/
div
ILOAD
20mV/
div
Time (100μs/div)
Time (20μs/div)
VO2 Load Transient
VO3 Load Transient
VIN = 3.7V, VVO3 = 7.3V, ILOADVO3 = 10mA to 150mA
VIN = 3.7V, VVO2 = -3.0V, ILOADVO2 = 10mA to 700mA
100mV/
div
100mV/
div
VO3
VO2
500mA/
div
ILOAD
100mA/
div
ILOAD
Time (50μs/div)
Time (20μs/div)
SG Micro Corp
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JULY 2022
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Triple-Output 700mA
SGM3838
AMOLED Display Power Supply
FUNCTIONAL BLOCK DIAGRAM
PGND1
SW1
VO1
FBS PGND3
SW3
VO3
AVIN
UVLO
&
Reference
AGND
SWIRE
VO3_EN
nFD
VO1 Controller
VO3 Controller
Control Logic
ELVDD
AVDD
&
Discharge
&
Protections
ELVSS_A
ELVSS_B
SHT
VO2 Phase A
Controller
VO2 Phase B
Controller
DGND
Oscillator
PGND2x
PVIN2B
SW2B
VO2B
PVIN2A
SW2A
VO2A
Figure 4. Functional Block Diagram
RECOMMENDED COMPONENT SELECTION
Table 1. Recommended component selection
Converter
Component
CIN1
Value
10μF
22μF
2.2μH
Number
Electrical Spec
X5R, 6.3V, 0402
X5R, 6.3V, 0603
4A, 70mΩ, 322512
Part Number
Manufacturer
Murata
1
2
1
GRM155R60J106ME05
GRM188R60J226MEA0
HMLQ32251B-2R2MS
ELVDD
CVO1
Murata
LVO1
Cyntec
CPVIN2A
CPVIN2B
CVO2A
CVO2B
LVO2A
10μF
22μF
2.2μH
1
1
1
X5R, 6.3V, 0402
X5R, 10V, 0603
4A, 70mΩ, 322512
GRM155R60J106ME05
GRM187R61A226ME15
HMLQ32251B-2R2MS
Murata
Murata
Cyntec
ELVSS
AVDD
LVO2B
CIN3
CVO3
LVO3
10μF
10μF
10μH
1
2
1
X5R, 6.3V, 0402
X5R, 16V, 0603
GRM155R60J106ME05
GRM188R61C106KAAL
SDEM25201B-100MS
Murata
Murata
Cyntec
1.3A, 390mΩ, 252012
SG Micro Corp
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JULY 2022
11
Triple-Output 700mA
SGM3838
AMOLED Display Power Supply
DETAILED DESCRIPTION
work. And only phase A works when the load current
decreases to 150mA for reducing the switching loss.
Under-Voltage Lockout (UVLO)
The built-in under-voltage lockout function (UVLO)
monitors the input voltage and disables the device
when the input voltage is too low to operate.
The output of VO2 is fully isolated in shutdown mode.
Boost Converter VO3 (AVDD)
Thermal Shutdown (TSD)
The Boost converter VO3 operates with a peak-current-
mode topology and fixed 1.45MHz (TYP) frequency.
The VO3 output voltage can be programmed between
5.5V and 7.9V (default 7.3V) with 100mV steps (see
Table 2).
The device has a function of thermal shutdown, which
prevents the device from damage due to overheating
and excessive power dissipation. The device stops
switching and shuts down all the outputs when the
junction temperature exceeds +145 ℃ (TYP), and
restarts with the same programmed voltages and
sequences when the temperature decreases to +135℃
(TYP).
The output of VO3 is fully isolated in shutdown mode.
Output Current Capacity
The device operates with an input voltage range of
2.5V to 4.8V. However, due to different input voltage
and different output voltage, the output current capacity
is quite different. A lower input voltage or a higher
output voltage leads to a lower output current capacity.
Boost Converter VO1 (ELVDD)
The Boost converter VO1 operates with a valley-
current-mode topology and fixed 1.45MHz (TYP)
frequency. The VO1 output voltage can be
programmed between 4.6V and 5.0V (default 4.6V)
with 100mV steps (see Table 2).
Input Power Supply
The input power supply voltage is recommended
between 2.5V and 4.8V. To achieve full performance, a
stable and noise-free input source is needed. Once the
distance between input source and SGM3838 is a bit
long, additional capacitors are suggested to place as
close to the device as possible. Please refer to the
typical application circuit for the suggested input
capacitance.
The output sense pin (FBS) is always connected to the
positive pin of output capacitor for the highest output
voltage accuracy. The wide hysteresis voltage makes
the device suitable for large path loss applications.
Additionally, the Boost converter can sense the output
voltage with the VO1 pin, when the FBS pin is floating
or connected to ground or connected as close to the
VO1 pin as possible.
SGMICRO has patented circuits to solve the spike
problem of VELVDD due to mode switching when the
input voltage rises close to or higher than the
The output of VO1 is fully isolated in shutdown mode.
Inverting Buck-Boost Converter VO2
(ELVSS)
programmed VELVDD
.
The inverting Buck-Boost converter VO2 operates with a
peak-current-mode topology and dual-phase fixed
1.25MHz (TYP) frequency. The VO2 output voltage can
be programmed between -6.0V to -0.8V (default -3.0V)
with 100mV steps (see Table 2).
Fault Protection Status (SHT)
The SHT is an interface to indicate a fault protection
(SCP, UVLO) status. SHT is internally pulled up to AVIN
through a 600kΩ resistor, and it will be pulled down to
AGND when fault protection (SCP or UVLO) occurs.
When the load current exceeds 260mA, phase A and
phase B of the inverting Buck-Boost converter both
SG Micro Corp
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JULY 2022
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Triple-Output 700mA
SGM3838
AMOLED Display Power Supply
DETAILED DESCRIPTION (continued)
The device starts with its default values (green marked
values in Table 2) if enabled. The SWIRE interface
counts the rising edges to set the corresponding values
as shown in Table 2. The device utilizes a volatile
memory to store the settings.
Digital Interface (SWIRE Pin)
The positive output voltages VELVDD, VAVDD and the
negative output voltage VELVSS can be programmed
through the SWIRE digital interface with 100mV steps.
Figure 2 shows an example for SGM3838 programming
VELVSS to -2.4V. The SWIRE pin can be used as a
standard enable pin if programming is not required.
Table 2. Programming Table
VO2
Transition
Time
Rising
Edges
VO2
(VELVSS
Rising
Edges
VO2
(VELVSS
Rising
Edges
VO3
(VAVDD
Rising
Edges Discharge
Outputs
Rising
Edges
Rising
Edges
VO1
(VELVDD)
)
)
)
controlled
0/no pulse
0/no pulse
-3.0V
27
-3.4V
0/no pulse
7.3V
0/no pulse
12ms
0/no pulse
4.6V
by nFD pin
1
-6.0V
-5.9V
-5.8V
-5.7V
-5.6V
-5.5V
-5.4V
-5.3V
-5.2V
-5.1V
-5.0V
-4.9V
-4.8V
-4.7V
-4.6V
-4.5V
-4.4V
-4.3V
-4.2V
-4.1V
-4.0V
-3.9V
-3.8V
-3.7V
-3.6V
-3.5V
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
-3.3V
-3.2V
-3.1V
-3.0V
-2.9V
-2.8V
-2.7V
-2.6V
-2.5V
-2.4V
-2.3V
-2.2V
-2.1V
-2.0V
-1.9V
-1.8V
-1.7V
-1.6V
-1.5V
-1.4V
-1.3V
-1.2V
-1.1V
-1.0V
-0.9V
-0.8V
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
5.5V
5.6V
5.7V
5.8V
5.9V
6.0V
6.1V
6.2V
6.3V
6.4V
6.5V
6.6V
6.7V
6.8V
6.9V
7.0V
7.1V
7.2V
7.3V
7.4V
7.5V
7.6V
7.7V
7.8V
7.9V
79
80
ON
81
82
fast
83
84
85
86
87
4.6V
4.7V
4.8V
4.9V
5.0V
2
OFF
12ms
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
SG Micro Corp
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JULY 2022
13
Triple-Output 700mA
SGM3838
AMOLED Display Power Supply
DETAILED DESCRIPTION (continued)
- VELVSS is not in regulation 5.6ms after VELVSS is
enabled (SWIRE = high for longer than 10ms) then all
converters shut down.
Soft-Start, Discharge, Start-Up and Timing
Shutdown
The built-in soft-start function is adopted to limit the
- VAVDD protection is enabled when the soft-start is
completed.
- VELVDD falls below 81% of the programmed output
voltage longer than 0.71ms then all converters shut
down.
- VELVSS rises above 82% of the programmed output
voltage longer than 0.71ms then all converters shut
down.
- VAVDD falls below 88% of the programmed output
voltage longer than 0.71ms then all converters shut
down.
inrush current.
The output discharge function can be controlled by both
nFD pin and SWIRE interface, where SWIRE interface
has the higher priority. The discharge function follows
the connection status of nFD pin until SWIRE pulse 79
or 80 is applied. In this case, if nFD = low or high
impedance, all outputs are discharged when the device
is shutdown. Once SWIRE counts 79 (discharge function
ON) or 80 (discharge function OFF) pulses, the function
follows the SWIRE.
Toggling SWIRE high or with relevant pulses enables
the VO1 Boost converter. VO1 starts with a 0.2A
soft-start current limit until it rises to the programmed
voltage. Then the full current limit is active (2.0A, TYP).
Device Reset
- Power resetting resets the device to default settings.
- Short circuit and overload protection reset all settings.
- Pulling SWIRE high to enable the VELVDD converter
resets the output discharge then output discharge is
controlled by nFD pin.
- Pulling SWIRE low for tOFF then VELVDD and VELVSS are
reset to default values of 4.6V and -3.0V, respectively.
- Pulling SWIRE low for tOFF then VELVSS transition time
is reset to default value of 12ms.
5ms after toggling SWIRE high, the VO2 converter
starts switching phase A (VO2A) with a 0.7A current
limit until the VO2 rises to the default voltage (-3V).
Then the full current limit is active (2.65A and 1.65A for
phase A and phase B respectively, TYP).
Toggling VO3_EN high starts the VO3 Boost converter.
Before VO3 rises to the default value (7.3V), it rises
- Pulling VO3_EN and SWIRE low at the same time for
linearly for 1.5ms with a 0.35A current limit. Then the
full current limit is active (1A, TYP).
t
OFF resets the SCP or overloading latch-up.
Layout Guideline
Overload and Short Circuit Protection (SCP)
The built-in short circuit protection (SCP) prevents the
device from damage. If any of the three outputs (VO1,
VO2 and VO3) is shorted to the ground or VO1 and
VO2 are shorted together, the SGM3838 will trigger the
function.
AMOLED displays are sensitive to quality of power
supplies. A good PCB layout is quite important to
reduce the ripple and to enhance the line and load
transients, as well as to achieve better noise, better
EMI and loop stability.
It is recommended to follow the below PCB layout
guidelines:
When a short or an overload occurs, all the three
converters stop switching, the outputs are shut down
and latched.
• A common ground plane between AGND and PGND
can minimize ground shifts.
Only resetting the power supply or pulling VO3_EN and
SWIRE low at the same time for more than tOFF can
restart the device.
• Traces of switching nodes (SW1, SW2A, SW2B and
SW3) should be short and wide.
• Place input and output capacitors as close as
possible to the related pins.
• Use short and wide traces to connect the input and
output capacitors to the related pins.
A SCP or overload occurs if any of the following events
happens:
- VELVDD is not in regulation 2.12ms after VELVDD is
enabled (SWIRE = high for longer than 2.12ms) then all
converters shut down.
• A common ground plane is between the ground pins
of input capacitors and output capacitors.
• If the power IC has an exposed pad, connect AGND
and PGND with the exposed pad.
SG Micro Corp
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JULY 2022
14
Triple-Output 700mA
SGM3838
AMOLED Display Power Supply
REVISION HISTORY
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
JULY 2022 ‒ REV.A.1 to REV.A.2
Page
Changed Description section.............................................................................................................................................................................All
MARCH 2021 ‒ REV.A to REV.A.1
Page
Changed Marking Information section..................................................................................................................................................................2
Changes from Original (NOVEMBER 2020) to REV.A
Page
Changed Electrical Characteristics section..........................................................................................................................................................6
Changed from product preview to production data.............................................................................................................................................All
SG Micro Corp
www.sg-micro.com
JULY 2022
15
PACKAGE INFORMATION
PACKAGE OUTLINE DIMENSIONS
WLCSP-2.5×2.5-36B
A1 CORNER
TOP VIEW
0.025± 0.005
0.22
0.20
0.4
36 ×
Φ
0.4
RECOMMENDED LAND PATTERN
2.500± 0.030
36 × Φ
0.260± 0.020
6
5
3
2
1
4
A
B
C
D
E
F
0.4
0.350± 0.025
0.200± 0.025
0.575± 0.050
0.4
SIDE VIEW
BOTTOM VIEW
NOTE: All linear dimensions are in millimeters.
SG Micro Corp
TX00173.000
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
WLCSP-2.5×2.5-36B
13″
12.4
2.66
2.69
0.77
4.0
8.0
2.0
12.0
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
13″
386
280
370
5
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TX20000.000
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