SGM38042 [SGMICRO]
Single Inductor Triple Output AMOLED Display Power Supply;
| 型号： | SGM38042 |
| 厂家： | 
Shengbang Microelectronics Co, Ltd |
| 描述： | Single Inductor Triple Output AMOLED Display Power Supply |
| 文件： | 总17页 (文件大小：791K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SGM38042
Single Inductor Triple Output
AMOLED Display Power Supply
GENERAL DESCRIPTION
FEATURES
The SGM38042 generates both positive and negative
precision regulated voltage power sources with a
control scheme for single inductor dual output converter.
Outputs are programmable in 100mV steps in 2.4V to
6.4V range, which are commonly used in drivers for
LCD displays and AMOLED displays, as well as in any
other circuits requiring both rails. A linear regulator
capable of 50mA output current is also integrated. The
device is equipped with 1-Wire interface. With input in
the range of 2.7V to 5.5V, the device is optimized for
loading 40mA in boost-inverter mode and also works in
buck-inverter mode.
● Single Inductor for Triple Outputs
● High Efficiency in Wide Output Loading Range
● 1.6MHz PWM Mode Control Switching Frequency
● Pulse-Skip Operation in Light Load Condition
● Programmable Outputs with 1-Wire Interface
VCPO = +2.4V ~ +6.4V
VCNO = -2.4V ~ -6.4V
● Auxiliary Output Rail: Fixed 2.8V or 1.8V
● 40mA Output Current for VCPO and VCNO
● Configurable Active Discharge
● Internal Soft-Start to limit Inrush Current
● Over-Temperature Protection (OTP)
● Over-Current Protection (OCP)
The SGM38042 is available in Green WLCSP-
1.51×2.10-15B package. It operates over an ambient
temperature range of -40℃ to +85℃.
● Short Circuit Protection (SCP)
APPLICATIONS
AMOLED/LCD Smart-Phones/Media-Players
Wearable Device Display
TYPICAL APPLICATION
L
4.7μH
SWN
CVO_EN
P2N
SWP
VIN
CVO Enable
Startup Sequence
1W I/F
2.7V ~ 5.5V
CVO
PO
2.8V/1.8V
1W
SGM38042
Discharge Enable
Discharge Enable
DISP
DISN
CPO
CNO
NO
2.4V ~ 6.4V
-2.4V ~ -6.4V
CN
CP
CV
CIN
10μF
PG
AG
10μF
10μF
10μF
CNR
CPR
10μF
10μF
Figure 1. Typical Application Circuit
SG Micro Corp
www.sg-micro.com
JANUARY 2021 – REV. A. 3
Single Inductor Triple Output
AMOLED Display Power Supply
SGM38042
PACKAGE/ORDERING INFORMATION
SPECIFIED
TEMPERATURE
RANGE
PACKAGE
DESCRIPTION
ORDERING
NUMBER
PACKAGE
MARKING
PACKING
OPTION
MODEL
XXXXX
GA8YG
SGM38042-0 WLCSP-1.51×2.10-15B
SGM38042-1 WLCSP-1.51×2.10-15B
SGM38042-2 WLCSP-1.51×2.10-15B
SGM38042-3 WLCSP-1.51×2.10-15B
SGM38042-4 WLCSP-1.51×2.10-15B
SGM38042-5 WLCSP-1.51×2.10-15B
SGM38042-6 WLCSP-1.51×2.10-15B
SGM38042-7 WLCSP-1.51×2.10-15B
SGM38042-8 WLCSP-1.51×2.10-15B
SGM38042-9 WLCSP-1.51×2.10-15B
SGM38042-10 WLCSP-1.51×2.10-15B
SGM38042-11 WLCSP-1.51×2.10-15B
SGM38042-12 WLCSP-1.51×2.10-15B
SGM38042-0YG/TR
SGM38042-1YG/TR
SGM38042-2YG/TR
SGM38042-3YG/TR
SGM38042-4YG/TR
SGM38042-5YG/TR
SGM38042-6YG/TR
SGM38042-7YG/TR
SGM38042-8YG/TR
SGM38042-9YG/TR
SGM38042-10YG/TR
SGM38042-11YG/TR
SGM38042-12YG/TR
Tape and Reel, 3000
Tape and Reel, 3000
Tape and Reel, 3000
Tape and Reel, 3000
Tape and Reel, 3000
Tape and Reel, 3000
Tape and Reel, 3000
Tape and Reel, 3000
Tape and Reel, 3000
Tape and Reel, 3000
Tape and Reel, 3000
Tape and Reel, 3000
Tape and Reel, 3000
-40℃ to +85℃
-40℃ to +85℃
-40℃ to +85℃
-40℃ to +85℃
-40℃ to +85℃
-40℃ to +85℃
-40℃ to +85℃
-40℃ to +85℃
-40℃ to +85℃
-40℃ to +85℃
-40℃ to +85℃
-40℃ to +85℃
-40℃ to +85℃
XXXXX
GA9YG
XXXXX
GAAYG
XXXXX
GABYG
XXXXX
GACYG
XXXXX
GADYG
XXXXX
GAEYG
XXXXX
GAFYG
XXXXX
GB0YG
XXXXX
GB1YG
XXXXX
GB2YG
XXXXX
GB3YG
XXXXX
GF8YG
MARKING INFORMATION
XXXXX = Date Code and Vendor Code.
X X X X X
Vendor Code
Date Code - Week
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.
SG Micro Corp
www.sg-micro.com
JANUARY 2021
2
Single Inductor Triple Output
AMOLED Display Power Supply
SGM38042
ABSOLUTE MAXIMUM RATINGS
VIN, CVO_EN, P2N, 1W, DISP, DISN Voltages
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.
............................................................................. -0.3V to 6V
CVO Voltage.............................................-0.3V to VIN + 0.3V
SWN Voltage ....................................................... -6.7V to 6V
SWN Voltage (Transient: 10ns, 1.6MHz)................ -8V to 8V
NO, CNO Voltages ........................................... -6.7V to 0.3V
SWP, PO, CPO Voltages.................................. -0.3V to 6.7V
SWP Voltage (Transient: 10ns, 1.6MHz) ................ -2V to 8V
Junction Temperature.................................................+150℃
Storage Temperature Range........................-65℃ to +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
MM.................................................................................400V
CDM ............................................................................1000V
RECOMMENDED OPERATING CONDITIONS
Supply Voltage Range........................................2.7V to 5.5V
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.
SELECTABLE MODEL
MODEL
DEFAULT OUTPUTS
SGM38042-0
SGM38042-1
SGM38042-2
SGM38042-3
SGM38042-4
SGM38042-5
SGM38042-6
SGM38042-7
SGM38042-8
SGM38042-9
SGM38042-10
SGM38042-11
SGM38042-12
VCPO = +5.4V/VCNO = -5.4V/VCVO = 2.8V
VCPO = +4.6V/VCNO = -3.5V/VCVO = 2.8V
VCPO = +5.0V/VCNO = -5.0V/VCVO = 2.8V
VCPO = +4.6V/VCNO = -2.4V/VCVO = 2.8V
VCPO = +6.4V/VCNO = -6.4V/VCVO = 2.8V
VCPO = +3.3V/VCNO = -3.0V/VCVO = 2.8V
VCPO = +5.4V/VCNO = -5.4V/VCVO = 1.8V
VCPO = +4.6V/VCNO = -3.5V/VCVO = 1.8V
VCPO = +5.0V/VCNO = -5.0V/VCVO = 1.8V
VCPO = +4.6V/VCNO = -2.4V/VCVO = 1.8V
VCPO = +6.4V/VCNO = -6.4V/VCVO = 1.8V
VCPO = +3.3V/VCNO = -3.0V/VCVO = 1.8V
VCPO = +4.6V/VCNO = -3.0V/VCVO = 2.8V
SG Micro Corp
www.sg-micro.com
JANUARY 2021
3
Single Inductor Triple Output
AMOLED Display Power Supply
SGM38042
PIN CONFIGURATION
(TOP VIEW)
2
1
3
CVO_EN
NO
DISP
DISN
AG
1W
A
B
C
D
E
P2N
VIN
PG
SWP
PO
SWN
CVO
CNO
CPO
WLCSP-1.51×2.10-15B
PIN DESCRIPTION
PIN
NAME
I/O
FUNCTION
A1
A2
A3
CVO_EN
NO
I
O
I
Enable for CVO. 0: Disable the LDO; 1: Enable the LDO.
Converter Negative Output.
1W
1-Wire Interface Input.
Conditioned Positive and Negative Output Startup Sequence. Connected to VIN for starting
conditioned positive output first; connected to AG for starting conditioned negative output first;
connected to 1W for starting conditioned positive and negative outputs simultaneously.
0: Disable Conditioned Positive Output Discharge; 1: Enable Conditioned Positive Output
Discharge.
B1
B2
P2N
I
I
DISP
B3
C1
PG
–
–
Power Ground.
Supply Input.
VIN
0: Disable Conditioned Negative Output Discharge; 1: Enable Conditioned Negative Output
Discharge.
C2
C3
D1
DISN
SWP
SWN
I
O
O
Switch Node for Powering the Positive-Rail. Connect this pin to one end of power inductor.
Switch Node for Powering the Negative-Rail. Connect this pin to the other end of power
inductor.
D2
D3
E1
E2
E3
AG
PO
–
Analog Ground.
O
O
O
O
Converter Positive Output.
Output of the Linear Regulator.
Conditioned Negative Output.
Conditioned Positive Output.
CVO
CNO
CPO
SG Micro Corp
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JANUARY 2021
4
Single Inductor Triple Output
AMOLED Display Power Supply
SGM38042
ELECTRICAL CHARACTERISTICS
(Tested at TA = +25℃, VIN = 3.7V, CVO_EN = 1W = P2N = VIN, Full = -40℃ to +85℃, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
TEMP
MIN
TYP
MAX
UNITS
General Features
Input Voltage Range
VIN
VUVLO
IQ
2.7
5.5
2.65
0.7
V
V
+25℃
+25℃
+25℃
Under-Voltage Lockout Threshold
Supply Current with No Load
VIN falling
2.2
0.5
VIN = 3.7V, no switching
mA
VIN = 3.7V,
CVO_EN = 1W = P2N = GND
Shutdown Current
IOFF
0.4
1
μA
+25℃
Power-On Blanking Time
tBLANK
fSW
IPEAK
VCPO
VIN = 3.7V
VIN = 3.7V
VIN = 3.7V
40
1.6
ms
MHz
A
+25℃
+25℃
+25℃
+25℃
+25℃
+25℃
+25℃
+25℃
+25℃
+25℃
+25℃
+25℃
+25℃
+25℃
+25℃
Switching Frequency
1.5
1.25
2.4
1.7
1.9
Inductor Peak Current
1.55
Conditioned Positive Output Voltage Range
6.4
V
VCPO_ACC_46 VIN = 3.7V, VCPO = +4.6V
-45
-60
+45
+60
mV
mV
Ω
Conditioned Positive Output Voltage Accuracy
VCPO_ACC_35 VIN = 3.7V, VCPO = +3.5V
Discharge Resistor of Conditioned Positive Output
Discharge Time of Conditioned Positive Output
Conditioned Negative Output Voltage Range
RDP
50
10
tDISP
ms
V
VCNO
-6.4
-45
-55
-2.4
+45
+55
VCNO_ACC_24 VIN = 3.7V, VCNO = -2.4V
VCNO_ACC_35 VIN = 3.7V, VCNO = -3.5V
RDN
mV
mV
Ω
Conditioned Negative Output Voltage Accuracy
Discharge Resistor of Conditioned Negative Output
Discharge Time of Conditioned Negative Output
50
10
tDISN
ms
mV
mV
VCVO_ACC_28 VIN = 3.7V, VCVO = +2.8V
VCVO_ACC_18 VIN = 3.7V, VCVO = +1.8V
-100
-45
+100
+45
Linear Regulator Output Voltage Accuracy
Logic CVO_EN, P2N, 1W
Low Level Input Voltage
VIL
VIH
REN
VIN = 2.7V to 5.5V
VIN = 2.7V to 5.5V
Full
Full
0.35
V
V
High Level Input Voltage
1.05
CVO_EN and P2N Pull-Down Resistors
Thermal Shutdown
200
kΩ
+25℃
Thermal Shutdown Threshold
Thermal Shutdown Hysteresis
TSHDN
THYS
150
15
℃
℃
SG Micro Corp
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JANUARY 2021
5
Single Inductor Triple Output
AMOLED Display Power Supply
SGM38042
1-WIRE INTERFACE TIMING CHARACTERISTICS
PARAMETER
1-Wire Initial Time
SYMBOL
tIH
MIN
TYP
0.2
1.2
20
MAX
UNITS
ms
ms
μs
Soft-Start Time by 1-Wire Enable
1-Wire High Level Pulse Time
1-Wire Low Level Pulse Time
1-Wire Signal Stop Indication Time
VOUT Turn-Off Delay by 1-Wire
tWAIT after Data
tSS
tSH
2
2
75
75
tSL
20
μs
tSTOP
300
10
400
μs
tVO_OFF_DLY
tWAIT
ms
μs
0
1-Wire Turn-Off Detection Time
tOFF_DLY
350
450
μs
1-WIRE PROTOCOL
1-Wire
tSTOP
tWAIT
tVO_OFF_DLY
VOUT Default
tSS
VOUT
tSH
tSL
tIH
tOFF_DLY
Figure 2. 1-Wire Protocol
SG Micro Corp
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JANUARY 2021
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Single Inductor Triple Output
AMOLED Display Power Supply
SGM38042
1-WIRE PROGRAMMING
Default Value
1-Wire
1-Wire
VCNO_1 = -6.4V
tSTOP
V
CNO_2 = -6.3V
1-Wire
1-Wire
1-Wire
1-Wire
1
tSTOP
VCNO_41 = -2.4V
1
1
1
2
39 40
40 41
41 42
tSTOP
tSTOP
tSTOP
VCNO_42 = VCNO_X - 0.05V
(X = 1, 2, ..., 41)
2
2
VCPO_43 = 6.4V
VCPO_44 = 6.3V
1-Wire
1-Wire
1
1
2
2
42 43
81 82
tSTOP
V
CPO_83 = 2.4V
tSTOP
Figure 3. 1-Wire Programming
1-WIRE COUNTS TO VOLTAGE VALUE MAPPING
COUNTS
1(43) (1)
2(44)
VCNO (V)
-6.4
-6.3
-6.2
-6.1
-6.0
-5.9
-5.8
-5.7
-5.6
-5.5
-5.4
-5.3
-5.2
-5.1
VCPO (V) (1)
COUNTS
15(57)
16(58)
17(59)
18(60)
19(61)
20(62)
21(63)
22(64)
23(65)
24(66)
25(67)
26(68)
27(69)
28(70)
VCNO (V)
-5.0
-4.9
-4.8
-4.7
-4.6
-4.5
-4.4
-4.3
-4.2
-4.1
-4.0
-3.9
-3.8
-3.7
VCPO (V)
5.0
COUNTS
29(71)
30(72)
31(73)
32(74)
33(75)
34(76)
35(77)
36(78)
37(79)
38(80)
39(81)
40(82)
41(83)
42
VCNO (V)
-3.6
VCPO (V)
3.6
6.4
6.3
4.9
-3.5
3.5
3(45)
6.2
4.8
-3.4
3.4
4(46)
6.1
4.7
-3.3
3.3
5(47)
6.0
4.6
-3.2
3.2
6(48)
5.9
4.5
-3.1
3.1
7(49)
5.8
4.4
-3.0
3.0
8(50)
5.7
4.3
-2.9
2.9
9(51)
5.6
4.2
-2.8
2.8
10(52)
11(53)
12(54)
13(55)
14(56)
5.5
4.1
-2.7
2.7
5.4
4.0
-2.6
2.6
5.3
3.9
-2.5
2.5
5.2
3.8
-2.4
2.4
5.1
3.7
VCNO_X - 0.05V
NOTE: 1. Conditioned negative voltage is programmed with counts 1 ~ 42. Conditioned positive voltage is programmed with
counts 43 ~ 83, which are listed between parentheses.
SG Micro Corp
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JANUARY 2021
7
Single Inductor Triple Output
AMOLED Display Power Supply
SGM38042
RECOMMENDED COMPONENTS OF TEST CIRCUITS
COMPONENT
COMPONENT
INDUCTOR
4.7μH/SLF7055T-4R7N3R1-3PF
CAPACITOR
10μF/08055C106KAT2A
TYPICAL PERFORMANCE CHARACTERISTICS
Tested at TA = +25℃, VIN = 3.7V, CVO_EN = 1W = P2N = VIN, unless otherwise noted.
Light Load
Heavy Load
AC Coupled
VCPO
AC Coupled
VCPO
AC Coupled
AC Coupled
VCNO
VCNO
IL
IL
VIN = 3.7V, VCPO = +4.6V, VCNO = -3V, ILOADPN = 1mA
VIN = 3.7V, VCPO = +4.6V, VCNO = -3V, ILOADPN = 30mA
Time (10μs/div)
Time (800ns/div)
Load Transient Response
Line Transient Response
AC Coupled
VCPO
AC Coupled
AC Coupled
VCPO
AC Coupled
VCNO
VCNO
VIN
VIN = 3.7V, VCPO = +4.6V, VCNO = -3V,
ILOADPN = 5mA to 30mA
ILOADPN
VIN = 2.8V to 4.5V, VCPO = +4.6V, VCNO = -3V,
ILOADPN = 30mA
Time (1ms/div)
Time (200μs/div)
SG Micro Corp
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JANUARY 2021
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Single Inductor Triple Output
AMOLED Display Power Supply
SGM38042
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
Tested at TA = +25℃, VIN = 3.7V, CVO_EN = 1W = P2N = VIN, unless otherwise noted.
Power-Down Sequencing with Discharge
Power-Down Sequencing without Discharge
VIN = 3.7V, VCPO = +4.6V, VCNO = -3V, VCVO = 2.8V,
VIN = 3.7V, VCPO = +4.6V, VCNO = -3V, VCVO = 2.8V,
CVO_EN
CVO_EN
ILOADPN = 0mA, RLOAD_CVO = 1kΩ
ILOADPN = 0mA, RLOAD_CVO = 1kΩ
VCVO
1W
VCVO
1W
VCPO
VCPO
VCNO
VCNO
Time (10ms/div)
Time (10ms/div)
Power-Up Sequencing
Power-Up Sequencing
P2N = GND
P2N = VIN
CVO_EN
VCVO
CVO_EN
VCVO
1W
VCPO
VCNO
1W
VCPO
VCNO
VIN = 3.7V, VCPO = +4.6V, VCNO = -3V, VCVO = 2.8V,
ILOADPN = 0mA, ILOAD_CVO = 0mA
VIN = 3.7V, VCPO = +4.6V, VCNO = -3V, VCVO = 2.8V,
ILOADPN = 0mA, ILOAD_CVO = 0mA
Time (10ms/div)
Time (10ms/div)
Power-Up Sequencing
P2N = 1W
CVO_EN
VCVO
1W
VCPO
VCNO
VIN = 3.7V, VCPO = +4.6V, VCNO = -3V, VCVO = 2.8V,
ILOADPN = 0mA, ILOAD_CVO = 0mA
Time (10ms/div)
SG Micro Corp
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JANUARY 2021
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Single Inductor Triple Output
AMOLED Display Power Supply
SGM38042
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
Tested at TA = +25℃, VIN = 3.7V, CVO_EN = 1W = P2N = VIN, unless otherwise noted.
Conditioned Positive Output Voltage vs. Output Current
4.601
Conditioned Negative Output Voltage vs. Output Current
-2.9971
-2.9976
-2.9981
-2.9986
-2.9991
-2.9996
-3.0001
4.600
4.599
4.598
4.597
4.596
4.595
0
5
10
15
20
25
30
35
40
0
5
10
15
20
25
30
35
40
Output Current (mA)
Output Current (mA)
Conditioned Positive Output Voltage vs. Input Voltage
Conditioned Negative Output Voltage vs. Input Voltage
-2.9990
4.612
4.608
4.604
4.600
4.596
-2.9995
-3.0000
-3.0005
-3.0010
ILOADPN = 30mA
ILOADPN = 30mA
2.5
3
3.5
Input Voltage (V)
4
4.5
2.5
3
3.5
4
4.5
Input Voltage (V)
Efficiency vs. Output Current
VIN = 4.2V
90
85
80
75
70
65
60
55
50
VIN = 3.7V
VIN = 2.8V
VCPO = +4.6V, VCNO = -3.0V, L = 4.7μH
0
10
20
30
40
Output Current (mA)
SG Micro Corp
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JANUARY 2021
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Single Inductor Triple Output
AMOLED Display Power Supply
SGM38042
FUNCTIONAL BLOCK DIAGRAM
L
4.7μH
CNR
10μF
CPR
10μF
KPL
KPH
CPO
CNO
PG
Ripple
Suppressor
E3
E2
B3
2.4V ~ 6.4V
KNH
KNL
CIN
10μF
Ripple
Suppressor
VIN
C1
-2.4V ~ -6.4V
CP
10μF
LDO
2.7V ~ 5.5V
2.8V (1)/1.8V
EAP
CVO
1W
E1
A3
CN
10μF
PWM
Timing
Control
CV
Σ
10μF
AG
D2
EAN
P2N
B1
A1
B2
C2
VNS
VPS
CVO_EN
DISP
Serial I/F
Voltage Reference
Voltage Settings
Ramp Control
Active Discharge Circuit
Bleeding Circuit
DISN
SGM38042
Figure 4. Functional Block Diagram
NOTE: 1. When VIN ≥ 3.0V, VCVO = 2.8V.
SG Micro Corp
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JANUARY 2021
11
Single Inductor Triple Output
AMOLED Display Power Supply
SGM38042
FUNCTION, OPERATION AND APPLICATION
This device is a dedicated approach for providing triple
outputs for AMOLED display panels. A unique control
scheme is developed for suppressing the loading cross
interference between two rails, which is considered as
a common drawback when using single inductor to
generate two rails. The circuit maintains regulation on
both rails without compromising performance in either
boost-inverter operation with any loading condition or
buck-inverter operation with almost any loading
condition. A linear regulator capable of 50mA output
current is also integrated.
A 40ms delay is starting as soon as the UVLO rising
threshold is reached. This delay is implemented to
prevent the device from being disabled or enabled by
an unwanted VIN voltage spike. Once this delay has
passed, the output rails can be enabled or disabled as
desired with the enable signals without any delay.
Active Discharge
An active discharge of the conditioned positive output
and/or the conditioned negative output can be
controlled by DISP and DISN pin. If DISP and/or DISN
are/is forced to be high, the discharge will occur at
power-down. The discharge switch will be turned off
after the 10ms discharge time.
Soft-Start
The SGM38042 uses an internal soft-start feature to
avoid high inrush currents during step-up.
Output Voltage
Over-Temperature Protection (OTP)
The output voltages of the converter are automatically
adjusted depending on the programmed VCPO and VCNO
voltages.
The SGM38042 includes an OTP feature to prevent
excessive power dissipation from overheating the
device. The OTP will shut down switching operation
when junction temperature exceeds +150℃. Once the
junction temperature cools down by approximately
15℃, the converter resumes operation.
EMI and Acoustic Interference
Switching noise propagating along wire connections
commonly dominates the EMI from the device
operation, which may degrade receiver sensitivities by
injecting interference into its carrier band or interim
band through inter-modulation in its down converters.
Inserting a ferrite bead into input power path and
making short and straightforward path always work well
in practice.
Over-Current Protection (OCP)
The SGM38042 includes a current sensing circuitry
which monitors the inductor current during each ON
period. If the current value becomes greater than the
current limit, the switch charging the inductor will turn
off, forcing the inductor to discharge.
The device limits its lowest pulse skip frequency to be
higher than audible frequency range for acoustic
interference free operation.
Short Circuit Protection (SCP)
The SGM38042 has an advanced short circuit
protection mechanism which prevents damage to the
device from unexpected applications. When the output
becomes shorted to ground, the current limit will
decrease to 500mA and the switching frequency will
fold back to 300kHz.
Component and Parameter Selection
CIN, CV, CPR, CNR, CP and CN can be any capacitance in
the range of 4.7μF ~ 47μF, and low loss Z5U, X7R and
X5R dielectric capacitors are recommended for better
performance. A 4.7μH inductor is recommended for the
best efficiency.
Under-Voltage Lockout
The SGM38042 integrates an under-voltage lockout
block (UVLO) that enables the device once the voltage
on VIN pin exceeds the UVLO rising threshold. No
output voltage will however be generated as long as the
enable signals are not pulled high. The device will be
disabled as soon as the VIN voltage falls below the
UVLO falling threshold.
Sequence
The 1W pin and P2N pin are used for generating the
startup sequence of the conditioned positive and
negative outputs. When the P2N pin is connected to
VIN pin, the conditioned positive output will start first.
When the P2N pin is connected to AG pin, the
conditioned negative output will start first. When the
P2N pin is connected to 1W pin, the conditioned
positive and negative outputs will start simultaneously.
SG Micro Corp
www.sg-micro.com
JANUARY 2021
12
Single Inductor Triple Output
AMOLED Display Power Supply
SGM38042
FUNCTION, OPERATION AND APPLICATION (continued)
CVO_EN
>450μs
CVO
1W
P2N
CPO
CNO
1.2ms
10ms
1.2ms
10ms
Default
1.2ms
Default
1.2ms
Default
Default
Figure 5. Startup Sequencing when P2N is Connected to VIN or Forced High
CVO_EN
>450μs
CVO
1W
P2N
Default
Default
1.2ms
10ms
1.2ms
10ms
CPO
CNO
1.2ms
1.2ms
Default
Default
Figure 6. Startup Sequencing when P2N is Connected to GND or Forced Low
CVO_EN
>450μs
CVO
1W
P2N
Default
Default
1.2ms
Default
Default
1.2ms
CPO
CNO
Figure 7. Startup Sequencing when P2N is Connected to 1W Pin
SG Micro Corp
www.sg-micro.com
JANUARY 2021
13
Single Inductor Triple Output
AMOLED Display Power Supply
SGM38042
FUNCTION, OPERATION AND APPLICATION (continued)
• For high dv/dt signals (switch pin traces): keep copper
PCB Layout Guidelines
to a minimum to prevent making unintentional parallel
plate capacitors with other traces or to a ground plane.
Best to route signal and return on same layer.
PCB layout is an important task in the power supply
design. Good PCB layout minimizes EMI and allows
very good output voltage regulation. For the
SGM38042 the following PCB layout guidelines are
recommended.
• For high di/dt signals: keep traces short, wide and
closely spaced. This will reduce stray inductance and
decrease the current loop area to help prevent EMI.
• Keep the power ground plane on the top layer (all
capacitor grounds and PG pins must be connected
together with one uninterrupted ground plane).
• Keep input capacitor close to the IC with low
inductance traces.
• AG and PG must be connected together on the same
ground plane.
• Keep trace from switching node pin to inductor short if
possible: it reduces EMI emissions and noise that may
couple into other portions of the converter.
• Always avoid vias when possible. They have high
inductance and resistance. If vias are necessary,
always use more than one in parallel to decrease
parasitics especially for power lines.
• Isolate analog signal paths from power paths.
REVISION HISTORY
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
JANUARY 2021 ‒ REV.A.2 to REV.A.3
Page
Updated Absolute Maximum Ratings...................................................................................................................................................................3
OCTOBER 2018 ‒ REV.A.1 to REV.A.2
Page
Updated Absolute Maximum Ratings...................................................................................................................................................................3
MARCH 2018 ‒ REV.A to REV.A.1
Page
Updated General Description...............................................................................................................................................................................1
Changes from Original (DECEMBER 2017) to REV.A
Page
Changed from product preview to production data.............................................................................................................................................All
SG Micro Corp
www.sg-micro.com
JANUARY 2021
14
PACKAGE INFORMATION
PACKAGE OUTLINE DIMENSIONS
WLCSP-1.51×2.10-15B
0.23
0.19
15 ×Φ
0.4
0.4
A1 CORNER
TOP VIEW
RECOMMENDED LAND PATTERN
2.095±0.025
15 ×Φ0.270±0.020
A
C
D
E
B
1
2
3
0.4
1.505±0.025
0.040±0.005
0.195±0.020
0.350±0.013
0.585±0.038
0.4
SIDE VIEW
BOTTOM VIEW
NOTE: All linear dimensions are in millimeters.
SG Micro Corp
TX00128.000
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-1.51×2.10-15B
7″
9.0
1.61
2.21
0.70
4.0
4.0
2.0
8.0
Q1
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
相关型号：
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