Datasheet
Power Supply IC Series for TFT-LCD Panels
Multi-Channel
System Power Supply IC
BM81028AMWV
●General
Description
BM81028AMWV is a system power supply IC for
TFT-LCD panels which are used in monitors, notebook
type displays, and tablets.
This IC incorporates HAVDD, VCOM amplifier in addition
to the power supply for panel driver (SOURCE, GATE,
and LOGIC power supplies).
Moreover, this IC has a built-in EEPROM for sequence
and output voltage setting retention.
●Applications
TFT-LCD Panels which are used in
Monitors, Note PCs and Tablets.
●Features
Input voltage range:
2.7V to 5.5V
Standby current:
1.4μA (Typ)
Operating temperature range:
-40℃ to +85℃
Step-down DC/DC converter 2-channels
(Synchronous rectification)
Step-up DC/DC converter
(Integrated load switch and Synchronous rectification)
HAVDD amplifier (8bit Resolution)
VCOM amplifier (8bit Resolution)
Positive charge pump (Integrated diode)
Negative charge pump
2
I C Interface Output Voltage Setting Control Function
(Integrated EEPROM)
Switching frequency switching function
(600kHz,1200kHz)
Protection circuits
Under-Voltage Lockout
Thermal Shut Down
Over-Current Protection
Over-Voltage Protection
Short Circuit Protection (Timer Latch type)
Input tolerant (SCL, SDA,EN)
●Package
UQFN28V4040P
W(Typ) D(Typ) H(Max)
4.0mm x 4.00mm x 1.00m
●Typical
Application Circuit
Fig.1. Typical Application Circuit
○Product
structure：Silicon monolithic integrated circuit
.
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○This
product has no designed protection against radioactive rays
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BM81028AMWV
●Pin
Configuration
Datasheet
AVDD_S
PGND2
PVCC1
AVDD
SWB2
SWB1
VCC
SW
HAVDD
AVDDP
Fig.2 Pin Configuration
●Pin
Descriptions
Pin
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Pin
Name
DRN
AVDDP
HAVDD
VCOM
GND
FAULT
VCC
SCL
SDA
EN
VREG
VDD2
VDD1
PGND1
Function
Negative charge pump driver pin
AVDD input
HAVDD amplifier output
VCOM amplifier output
Ground
FAULT signal output
Power supply input
Serial clock input (I2C)
Serial clock data input (I2C)
Enable input
Inner power supply output
Step-down DC/DC output feedback input 2
Step-down DC/DC output feedback input 1
Step-down DC/DC ground
Pin
No.
15
16
17
18
19
20
21
22
23
24
25
26
27
28
Pin
Name
SWB1
PVCC1
SWB2
PGND2
SW
AVDD
AVDD_S
PVCC2
VLSO
VGL
CPGND
VGH
CPP
DRP
Function
Step-down DC/DC switching pin 1
Step-down DC/DC power supply input
Step-down DC/DC switching pin 2
Step-down/-up DC/DC ground
Step-up DC/DC switching pin
Step-up DC/DC output
Step-up DC/DC output feedback
Step-up DC/DC load switch input
Step-up DC/DC load switch output
Negative charge pump feedback
Charge pump ground
Positive charge pump feedback
Built-in Positive charge pump switching Di output
Positive charge pump driver pin
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FAULT
VCOM
GND
DRN
22 23 24 25 26 27 28
8
9
10 11 12 13 14
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●Block
Diagram
VCC
Datasheet
7
erramp
pwmcomp
soft start
driver
15
SWB1
VDD1
14
PGND1
vref
13
VDD1
PVCC1
16
erramp
pwmcomp
SWB2
soft start
driver
17
PGND2
VREG
18
11
vreg
12
VDD2
PVCC2
22
load SW
23
Internal Regulator
VLSO
19
erramp
pwmcomp
SW
AVDD
register
DAC
20
driver
EEPROM
21
AVDD_S
soft start
PGND2
SCL
8
9
AVDD
SDA
logic
register
DAC
3
HAVDD
AVDD
EN
10
control
register
DAC
4
osc
OSCGND
AVDD
VDD1
VDD2
CP_CLK
Internal Regulator
register
DAC
erramp
2
AVDDP
driver
28
DRP
soft start
25
CPGND
26
VGH
level shift
27
CPP
level shift
Internal Regilator
6
FAULT
register
fault
DAC
erramp
DRN
driver
1
GND
soft start
5
CPGND
24
VGL
Fig.3 Block Diagram
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●Function
Description of Each Block
Datasheet
Enumerated below are the different blocks and the output voltages they generate. Also, discussed are the protection circuits
that can shut down each block to prevent IC destruction.
All output voltages generated by each block, startup order, and delay time (DELAY1 and DELAY2) can be set through the
EEPROM. Upon start-up, these settings are read from the EEPROM and copied to the registers.
①
Buck Converter Block (VDD1, VDD2)
Generates the VDD1 and VDD2 voltages after VCC UVLO release at EN=High.
This block shuts down when SCP or OCP is detected.
Boost Converter Block (AVDD)
Generates the AVDD voltage after the configured DELAY2 time.
This block shuts down when OVP, SCP, or OCP is detected.
HAVDD Amp Block (HAVDD)
Generates the HAVDD voltage based on the AVDD voltage.
Thus, the HAVDD voltage is produced after the AVDD voltage.
②
③
④
VCOM Amp Block (VCOM)
Generates the VCOM voltage based on the AVDD voltage.
Thus, the VCOM voltage is produced after the AVDD voltage.
⑤
Positive Charge Pump Block (VGH)
Generates the VGH voltage based on the AVDD voltage.
Thus, the VGH voltage is produced after the AVDD voltage.
This block shuts down when SCP is detected.
⑥
Negative Charge Pump Block (VGL)
Generates the VGL voltage based on the AVDD voltage.
It starts up after the configured DELAY2 time.
This block shuts down when SCP is detected.
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●Absolute
Maximum Ratings
LIMITS
PARAMETER
Power Supply Voltage
SYMBOL
MIN
VCC, PVCC1, PVCC2
SWB1, SWB2
VDD1, VDD2
AVDD, AVDDP, SW
VLSO
HAVDD, VCOM
Output Pin
DRP, DRN
CPP
VGH,
VGL
VREG
FAULT
Functional Pin Voltage
Maximum Junction temperature
Power Dissipation
Operating Temperature Range
Storage Temperature Range
(1) Junction temperature at storage time.
(2) JEDEC standard (4 layers)
Datasheet
Unit
TYP
－
－
－
－
－
－
－
－
－
－
－
－
－
－
2.01
-40
-55
－
－
85
150
MAX
6.5
PVCC1+0.3
6.5
19
6.5
AVDDP+0.3
AVDDP+0.3
30
36
0.3
VCC+0.3
6.5
6.5
150
V
V
V
V
V
V
V
V
V
V
V
V
V
℃
W
℃
℃
-0.3
-0.3
-0.3
-0.3
-0.3
-0.3
-0.3
-0.3
-0.3
-15
-0.3
-0.3
-0.3
－
SCL, SDA, EN
Tjmax
(1)
Pd
(2)
Topr
Tstg
●Recommended
Operating Ratings(T
A
=-40℃ to +85℃)
PARAMETER
Power Supply Voltage 1
( DC/DC Block Protection
Detection Voltage 1 setting)
Power Supply Voltage 2
( DC/DC Block Protection
Detection Voltage 2 setting)
Power Supply Voltage 3
( DC/DC Block Protection
Detection Voltage 3 setting)
Power Supply Voltage 4
( DC/DC Block Protection
Detection Voltage 4 setting)
SWB1,SWB2 Current
SW Current
Functional Pin Voltage
2 Line Serial Pin Voltage
2 Line Serial Frequency
SYMBOL
MIN
2.7
TYP
－
MAX
5.5
Unit
V
2.9
VCC,PVCC1,PVCC2
3.1
－
5.5
V
－
5.5
V
3.3
ISW1
ISW2
EN
SDA, SCL
FCLK
－
－
-0.1
-0.1
－
－
－
－
－
－
－
5.5
1.0
1.5
5.5
5.5
400
V
A
A
V
V
kHz
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