NOVALOG NT50366

NT50366
TFT-LCD Multi-Channel DC-DC Converters
V0.1
Preliminary
NT50366
Index
History............................................................................................................. 3
Applications..................................................................................................... 3
Ordering Information ...................................................................................... 3
Features........................................................................................................... 4
Function Block Diagram................................................................................... 3
Application Circuit........................................................................................... 5
Power On/Off Sequence.................................................................................... 5
Pin Configuration............................................................................................. 9
Electrical Characteristics................................................................................ 10
I2C Command List and Description................................................................ 12
Application Information................................................................................. 27
Design Guide Line.......................................................................................... 28
Footprint Information .................................................................................... 29
2
Ver 0.1
NT50366
History
Version
0.0
Content
Page
New SPEC
Date
2013/04/26
Applications
Notebook Computer Displays
LCD Monitor Panels
Automotive Displays
Ordering Information
Part No.
NT50366QG/A
Package
QFN-32 4x4
Temp Range
-40°C~85°C
3
Ver 0.1
NT50366
Features
2.5V to 5.5V Input Supply Range
2-wire I2C interface: AVDD, HAVDD, VCOM, VGH,
VGL, VBO1 and VBO2, VGM1 and VGM14 can
be programmable
I2C interface command Enable
1.2MHz Current-Mode Boost Converter
Fast Transient Response to Pulsed Load
High-Accuracy Output Voltage (±2%)
Built-In 16.5V, 1.5A, 0.35Ω N-Channel MOSFET
High Efficiency Up to 90%
Over-Current Protection
Positive Regulated Charge Pump with diode free.
Negative Regulated Charge Pump with diode free.
Two 1.2MHz Current-Mode LV Buck Converters
Buck1 Output Voltage: 1.0V~2.8V
Buck2 Output Voltage: 1.5V~2.6V
Built-In P/N-Channel MOSFET
No Schottky Diode Require
Over-Current Protection
Power-On Sequence Timing Control
Low Voltage Detector
Programmable Detecting Voltage
Programmable VCOM voltage and buffer
±200mA Output Short-Circuit Current
25V/µs Slew Rate
Programmable HAVDD voltage and buffer
±200mA Output Short-Circuit Current
25V/µs Slew Rate
Programmable Gamma Voltages and output buffers
±20mA Output Short-Circuit Current
5V/µs Slew Rate
Over Temperature Protection
32-pin thin QFN 4x4 Package
RoHS Compliant and 100% Lead (Pb)-Free
Functional Block Diagram
Boost
Converter
Programmable
VCOM
HAVDD
Buffer
Gamma
Buffer
I2C I/F
MTP
Timing Control
Low Voltage
Detector
BUCK
Converter 1
BUCK
Converter 2
4
Negative
Charge Pump
Regulator
Positive
Charge Pump
Rugulator
Ver 0.1
NT50366
Application Circuit
1. Buck2 as Buck output
VIN
L3
10uH
D1
VIN
1
2
AVDD
AVDD
OPAO
AVDD
AVDD
C1
10uF/6.3V
C2
10uF/6.3V
C3
0.1uF/50V
C4
10uF/25V
C5
10uF/25V
C6
0.1uF/50V
C24
2.2uF/25V
C23
2.2uF/25V
HAVDD
VGM1
VGM14
VDDIO
C22
1uF/10V
VDD
C21
1uF/25V
C20
10uF/16V
C20
0.1uF/50V
26
25
VGM14
27
29
30
28
AVDD
VGM1
VGL
NT50366
DRVP
SCL
CFLYH1
CFLYH2
R43
23
0
VGL
C17
0.1uF/16V
22
21
R44
20
0
C18
C19
2.2uF/6.3V
D2
19
2.2uF/16V
18
1SS416CT
17
VGH
CFLYH3
VIN
24
16
LX2
VBO2
15
14
9
VIN
13
VIN1
VBO1
VIN2
QFN32 4x4
GNDP2
8
NC
VDDIO
12
7
GNDP1
6
C8
0.1uF/16V
CFLYL
SDA
5
C7
2.2uF/6.3V
ENA
11
SCL
STATUS
DRVN
1
4
VIN
VIN
XON
2
3
SDA
OPAN
LX
2
HAVDD
1
R42 Open
XON
OPAO
32
R2
10k
GNDP
R3
4.7K
LX1
R4
4.7K
10
VGH
C14
4.7uF/6.3V
C29
C9
10uF/6.3V
VIN
C14
C15
C16
0.1uF/35V
C13
0.1uF/35V
2.2uH
0.1uF/35V
L1
VCC
1uF/50V
VCC
1uF/50V
R5
10K
GNDA
R41
10k
31
VIN
VIN
C10
4.7uF/6.3V
L2
2.2uH
VDD
VDD
C11
10uF/6.3V
5
Ver 0.1
NT50366
2. Buck2 as LDO output
VIN
L3
10uH
D1
VIN
1
2
AVDD
AVDD
OPAO
AVDD
AVDD
C1
10uF/6.3V
C2
10uF/6.3V
C3
0.1uF/50V
C4
10uF/25V
C5
10uF/25V
C6
0.1uF/50V
C24
2.2uF/25V
C23
2.2uF/25V
HAVDD
VGM1
VGM14
VDDIO
C22
1uF/10V
VDD
C21
1uF/25V
C20
10uF/16V
C20
0.1uF/50V
R43
23
0
VGL
C17
0.1uF/16V
22
21
C19
2.2uF/6.3V
1
R44
20
0
C18
D2
19
2.2uF/16V
18
1SS416CT
17
VGH
16
VGH
R45
1k
C29
1uF/50V
1uF/50V
C9
10uF/6.3V
C14
C15
C16
0.1uF/35V
C13
0.1uF/35V
2.2uH
VCC
0.1uF/35V
9
CFLYH3
VIN
24
2
26
25
VGM14
27
QFN32 4x4
VBO1
VIN
C14
4.7uF/6.3V
L1
VGM1
28
29
30
CFLYH2
VIN
VCC
HAVDD
AVDD
OPAN
CFLYH1
VBO2
8
NC
VDDIO
15
C8
0.1uF/16V
DRVP
VIN1
C7
2.2uF/6.3V
NT50366
SCL
VIN2
7
VGL
14
6
CFLYL
SDA
LX2
5
ENA
13
SCL
STATUS
DRVN
GNDP2
4
VIN
VIN
XON
12
3
SDA
LX
GNDP1
2
11
1
R42 Open
XON
OPAO
32
R2
10k
GNDP
R3
4.7K
LX1
R4
4.7K
10
R5
10K
GNDA
R41
10k
31
VIN
VIN
VIN
C10
4.7uF/6.3V
VDD
VDD
C11
1uF/6.3V
6
Ver 0.1
NT50366
Power On/Off Sequence
When the input voltage reaches the UVLO, the LDOO will start to work, after the I2C enable command,
the other blocks will turn on as below:
Power On, CMD on & Power Off
VIN
UVLO
IC Status
Initial
< 2ms
(~1.9V)
Power on
Delay
Buck Enable
AVDD/VGL/VGH Enable
Normal Operating
Low
Voltage
Depend on LVDT[1:0]
Power Off
PWRON[2:0]
VBO1
Soft Start
VBO2
I2C command send
PMU_EN=1
“
Soft Start
BUK_DLY[2:0]
AVDD_DLY[1:0]
AVDD
VCOM
&
HAVDD
&
VGM1/VGM14
”
Soft Start
‘Floating’
VGL_DLY[1:0]
VGL
VGH_DLY[1:0]
VGH
XON
Blanking
Blanking
Blanking : Voltage follow external pull high source.
7
Ver 0.1
NT50366
Power on & CMD on/off
VIN
UVLO
IC Status
Initial
< 2ms
Power on
Delay
Buck Enable
AVDD/VGL/VGH Enable
Normal Operating
ENA is low
PWRON[2:0]
ENA
VBO1
Soft Start
VBO2
Soft Start
“
”
I2C command send
PMU_EN=1
BUK_DLY[2:0]
PWR_OFF[2:0]
AVDD_DLY[2:0]
Soft Start
AVDD
VCOM
&
HAVDD
&
VGM1/VGM14
‘Floating’
VGL_DLY[1:0]
VGL
VGH_DLY[1:0]
VGH
XON
Blanking
Blanking
Blanking : Voltage follow external pull high source.
8
Ver 0.1
NT50366
Pin Configuration
GNDP
GNDA
OPAO
OPAN
AVDD
HAVDD
VGM1
VGM14
(Top View – Perspective)
32
31
30
29
28
27
26
25
LX
1
24
VIN
XON
2
23
DRVN
ENA
3
22
CFLYL
SDA
4
21
VGL
20
DRVP
E- PAD
( AGND)
7
18
CFLYH2
VBO1
8
17
CFLYH3
10
11
12
GNDP2
9
13
14
15
16
VGH
VDDIO
VBO2
CFLYH1
VIN2
19
LX2
6
GNDP1
NC
LX1
5
VIN1
SCL
IC Pin Configuration
9
Ver 0.1
NT50366
Absolute Maximum Ratings
VIN, VIN1, VIN2, VDDIO, SDA, SCL to GNDA…...............-0.3V to +6.5V
ENA, NC to AGND............................................-0.3V to (VIN +0.3V)
VBO1, VBO2, XON, VGM14 to GNDA......-0.3V to (VIN +0.3V)
GNDP to GNDA.................................................................................±0.3V
GNDP1 to GNDA...............................................................................±0.3V
GNDP2 to GNDA...............................................................................±0.3V
LX to GNDP..........................................................................-0.3V to +18V
LX1 to GNDP1............................................................ -0.3V to (VIN +0.3V)
LX2 to GNDP2............................................................ -0.3V to (VIN +0.3V)
AVDD to GNDA....................... ........ ........ ............................-0.3V to +18V
VGH, CFLYH1, CFLYH2, CFLYH3, DRVN to GNDA…… -0.3V to +30V
DRVP, OPAN, OPAO, HAVDD,VGM1 to GNDA...-0.3V to (VAVDD + 0.3V)
VGL, CFLYL………………… ..............................................-16V to + 0.3V
Continuous Power Dissipation (TA=+70°C)
32-Pin QFN (derate 21.2mW/°C above +70°C) …………….….……TBD
Junction Temperature .....................................................................+160°C
Operating Temperature Range……..……….….………-40°C to +85°C
Storage Temperature Range ...........................................-65°C to +160°C
Lead Temperature (soldering, 10s) ……..……….….………………260°C
Package Thermal Resistance (θJA) ……..……….…….…….……….TBD
ESD Susceptibility (HBM)……..……….………………….…………….2KV
ESD Susceptibility (MM) ……..……….………………….…………….200V
Note: Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only
and functional operation of the device at these or any other condition beyond those indicated in the operational sections of the specifications is not
implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Electrical Characteristics
(VIN
＝3.3V, V ＝3.3V, V ＝3.3V, VDDIO＝3.3V, V ＝10.5V, PGND＝AGND＝0V. Typical values are at T ＝25°C, unless otherwise noted.)
IN1
IN2
PARAMETER
VIN, VIN1, VIN2 Supply Range
VDDIO Supply Range
AVDD
A
SYMBOL
CONDITION
VIN
VDDIO
VIN Under-Voltage Lockout Threshold
VUVLO
VIN rising
Hysteresis
VIN Quiescent Current3
IQ3_VIN
LX switching (no loading)
Over Temperature Protection
TOTP
MIN
TYP
MAX
UNITS
2.5
–
5.5
V
V
1.8
–
5.5
1.9
2.1
0.2
2.3
2
mA
Temperature rising
160
Hysteresis
20
℃
ENA PIN
ENA threshold voltage
V
VIH
–
–
–
0.8
90
100
110
86
90
1.5
VIL
–
V
Current Mode Boost Converter
Operating Frequency
FOSC
compare with target
Oscillator Maximum Duty Cycle
Output Voltage Range
Output Voltage Accuracy
VACC-AVDD
Over Voltage Protection
VOVP-AVDD
Under Voltage Protection
VUVP-AVDD
5 bits resolution, step=0.25V
6.6
No load, TA
98
＝25°C, compare with target
100
%
%
14.2
V
102
%
16
V
VAVDD falling under Target percentage
80
%
AVDD Fault Condition
OVP or UVP continued occur
100
ms
Maximum Driving Ability
VIN=3.3V, AVDD=10V
–
300
1.5
–
mA
98
100
102
%
LX Current Limit
ILIM
Duty cycle＝65%
Current Mode Buck Converter1
Output Voltage Accuracy
Output Voltage
Under Voltage Protection
VACC-VBO1
VBO1,
VUVP-VBO1
No load, TA
＝25°C, compare with target
3bit resolution, 1.0V~1.3V and 1.8V
V B U CK1
1.0
falling under target
1.8
80
A
V
%
VBO1 Fault Condition
UVP continued occur
100
ms
Maximum Driving Ability
VIN=VIN1=3.3V, VBO1=1.2V
–
500
1.5
–
mA
98
100
102
%
LX1 Current Limit
ILIM1
Current Mode Buck Converter2
Output Voltage Accuracy
Output Voltage
Under Voltage Protection
VACC-VBO2
No load, TA
＝25°C, compare with target
VBO2
4bit resolution, 1.5V~2.6V
VUVP-VBO2
V B U CK2 falling under target
10
1.5
2.6
80
A
V
%
Ver 0.1
NT50366
VBO2 Fault Condition
UVP continued occur
100
ms
Maximum Driving Ability
VIN=VIN2=3.3V, VBO2=2.5V/1.8V
500
mA
LX2 Current Limit
ILIM2
–
1.5
–
26
V
100
104
%
A
Positive Charge-Pump Regulator
Output Voltage Range
Output Voltage Accuracy
Vacc-VGH
Over Voltage Protection
VOVP-VGH
Under Voltage Protection
VUVP-VGH
5 bits resolution, step=0.5V
12
No load, TA
96
＝25°C, compare with target
28
V
VVGH falling under Target percentage
80
%
VGH Fault Condition
OVP or UVP continued occur
100
ms
Maximum Driving Ability
AVDD=10V, VGH=18V, VGL=-6V
5
mA
Negative Charge-Pump Regulator
Output Voltage Range
4 bits resolution, step=0.5V
Output Voltage Accuracy
Vacc-VGL
Over Voltage Protection
VOVP-VGL
Under Voltage Protection
VUVP-VGL
No load, TA
＝25°C, compare with target
-11.5
96
100
-4
V
104
%
-13
V
VVGH rising under Target percentage
80
%
VGL Fault Condition
OVP or UVP continued occur
100
ms
Maximum Driving Ability
AVDD=10V, VGH=18V, VGL=-6V
5
mA
XON (Voltage Detector)
Detecting Voltage Accuracy
XON Output Sink Current
＝25°C, compare with target
Vacc-XON
No load, TA
Vhys-XON
Hysteresis
100
mV
ISINK-XON
VXON=0.4V
1
mA
95
100
105
%
Programmable VGMA and output buffer
Supply Range
VAVDD
6.6
-
Output Voltage, zero-scale error
Output Voltage, full-scale error
Output Voltage Ability
IOUT
Short-Circuit Current
＝+/-1mA
SR
-3dB Bandwidth
Gain-Bandwidth Product
2
V
LSB
10
LSB
mV
20
Maximum source/sink current
Slew Rate
13.2
20
mA
5
V/µs
F3dB
No load
10
MHz
GBW
No load
6
MHz
Programmable VCOM and output buffer
Supply Range
VAVDD
6.6
VVCOM
0.5*AVDD
-3.6875
13.2
V
0.5*AVDD
-0.5
V
Output Voltage, zero-scale error
2
LSB
Output Voltage, full-scale error
10
LSB
Output Voltage Range
8 bits resolution, step=12.5mV
-
Output Voltage Ability
each step, IOUT
＝+/-10mA
20
mV
Short-Circuit Current
each step, maximum source/sink current
200
mA
Slew Rate
SR
25
V/µs
-3dB Bandwidth
F3dB
20
MHz
GBW
8
MHz
Gain-Bandwidth Product
Programmable HAVDD and output buffer
Supply Range
Output Voltage Range
VAVDD
VHAVDD
6.6
7 bits resolution, step=12.5mV
total 105 steps
0.5*AVDD
+0.7875
-
13.2
V
0.5*AVDD
-0.8
V
Output Voltage, zero-scale error
HAVDD[6:0]=0000000
7
LSB
Output Voltage, full-scale error
HAVDD[6:0]=1111111
7
LSB
11
Ver 0.1
NT50366
Output Voltage, accuracy
HAVDD[6:0]=1000000
Output Voltage Ability
IOUT
Short-Circuit Current
Maximum source/sink current
2
＝+/-10mA
LSB
20
mV
200
mA
Slew Rate
SR
25
V/µs
-3dB Bandwidth
F3dB
20
MHz
GBW
8
MHz
Gain-Bandwidth Product
I2C INTERFACE
Low Level Input Voltage
VIL
VIN=2.5V to 5.5V
High Level Input Voltage
VIH
VIN=2.5V to 5.5V
Low Level Output Voltage
VCL1
Sinking 2.5mA
Internal Pull High Resistor-1
RPULL
SDA, SCL internal pull high resistor
EEPROM Write Time
TWRITE
200
msec
Number of Guaranteed
EEPROM Write Cycles
NWRITE
100
Cycles
12
0.5
1.5
V
V
0.4
V
Ω
K
300
Ver 0.1
NT50366
I2C Command List and Description
CMD
D7
D6
D5
D4
D3
D2
D1
D0
01h
--
--
02h
--
03h
--
--
VGL[3:0]
00100100
04h
--
VBO1[2:0]
VBO2[3:0]
00110101
05h
--
--
06h
--
VGL_DLY[1:0]
07h
--
VCOM_ADJ
08h
--
--
--
VGM1[4:0]
00000000
09h
--
--
--
VGM14[4:0]
00000000
0Ah
--
AVDD[5:0]
--
00001001
VGH[4:0]
--
00001100
--
LVDT[1:0]
VGH_DLY[1:0]
BUK_DLY[2:0]
01011110
AVDD_DLY[2:0]
00001001
PWR_OFF[2:0]
00000001
HAVDD[6:0]
0Bh
Default Value
00111111
OPA[7:0]
01001000
0Dh
--
--
--
W_VOLT
--
--
--
W_OPA
00000000
0Eh
--
--
--
--
--
--
PC_EN
PMU_EN
00000000
Note:
1. Typical value: AVDD=8.4V, VGH=18V, VGL=-6V, VGM1=AVDD-0.2V, VGM14=0.2V, HAVDD=0.5*AVDD, OPAO=0.5*AVDD-1.4V, VBO1=1.5V,
VBO2=1.5V
2. D7-bit of command 01h~0Ah is the parity check bit.
In the register setting, please follow the sequence as below:
0Eh 01h
( set PC_EN=0 )
Register Setting
01h xxh
02h xxh
03h xxh
... ...
0Eh 03h
( set PC_EN=1 & PMU_EN=1 )
13
Ver 0.1
NT50366
Set AVDD voltage
01H
(AVDD)AVDD voltage
Inst / Para
D7
D6
01h
0
0
Parameter
01H_C
Default Value：AVDD=8.4V
Description
D5
0
AVDD[5]
D4
0
AVDD[4]
D3
1
AVDD[3]
D2
0
AVDD[2]
D1
0
AVDD[1]
D0
1
AVDD[0]
(code)
(09h)
--Set the AVDD voltage
Register
000000
000001
000010
000011
000100
000101
000110
000111
001000
001001
001010
001011
001100
001101
001110
001111
010000
010001
010010
010011
010100
010101
010110
010111
011000
011001
011010
011011
011100
011101
011110
011111
AVDD[5:0]
V
Register
6.60
100000
6.80
100001
7.00
100010
7.20
100011
7.40
100100
7.60
100101
7.80
100110
8.00
100111
8.20
101000
8.40
101001
8.60
101010
8.80
101011
9.00
101100
9.20
101101
9.40
101110
9.60
101111
9.80
110000
10.00
110001
10.20
110010
10.40
110011
10.60
110100
10.80
110101
11.00
110110
11.20
110111
11.40
111000
11.60
111001
11.80
111010
12.00
111011
12.20
111100
12.40
111101
12.60
111110
12.80
111111
V
13.00
13.20
13.40
13.60
13.80
14.00
14.20
14.20
14.20
14.20
14.20
14.20
14.20
14.20
14.20
14.20
14.20
14.20
14.20
14.20
14.20
14.20
14.20
14.20
14.20
14.20
14.20
14.20
14.20
14.20
14.20
14.20
14
Ver 0.1
NT50366
Set Charge Pump Clock & VGH voltage
02H
(VGH)VGH voltage
Inst / Para
D7
D6
02h
0
0
Parameter
02H_C
--Default Value：VGH=18V
D5
0
---
D4
0
VGH[4]
D3
1
VGH[3]
D2
1
VGH[2]
D1
0
VGH[1]
D0
0
VGH[0]
(code)
(0Ch)
Description
--Set the VGH voltage
Register
00000
00001
00010
00011
00100
00101
00110
00111
01000
01001
01010
01011
01100
01101
01110
01111
V
12.0
12.5
13.0
13.5
14.0
14.5
15.0
15.5
16.0
16.5
17.0
17.5
18.0
18.5
19.0
19.5
VGH[4:0]
Register
10000
10001
10010
10011
10100
10101
10110
10111
11000
11001
11010
11011
11100
11101
11110
11111
V
20.0
20.5
21.0
21.5
22.0
22.5
23.0
23.5
24.0
24.5
25.0
25.5
26.0
26.0
26.0
26.0
15
Ver 0.1
NT50366
Set Power on delay time & VGL voltage
03H
(VGL)VGL voltage
Inst / Para
D7
D6
03h
0
0
Parameter
03H_C
--Default Value： VGL=-6V
D5
1
---
D4
0
D3
0
VGL[3]
D2
1
VGL[2]
D1
0
VGL[1]
D0
0
VGL[0]
(code)
(24h)
Description
--Set the VGL voltage
VGL[3:0]
Register
V
0000
-4.0
0001
-4.5
0010
-5.0
0011
-5.5
0100
-6.0
0101
-6.5
0110
-7.0
0111
-7.5
1000
-8.0
1001
-8.5
1010
-9.0
1011
-9.5
1100
-10.0
1101
-10.5
1110
-11.0
1111
-11.5
16
Ver 0.1
NT50366
Set BUCK1/BUCK2 voltage
04H
(VBO1) VBO1 voltage
(VBO2) VBO2 voltage
Inst / Para
D7
D6
04H
0
0
Parameter
VBO1[3]
VBO1[2]
Default Value：VBO1=1.5V ; VBO2=1.5V
Description
D5
1
VBO1[1]
D4
1
VBO1[0]
D3
0
VBO2[3]
D2
1
VBO2[2]
D1
0
VBO[1]
D0
1
VBO2[0]
(code)
(35h)
--Set BUCK1 voltage
VBO1[3:0]
Register
V
0000
1.2
0001
1.3
0010
1.4
0011
1.5
0100
1.6
0101
1.7
0110
1.8
0111
2.8
1000
0.8
1001
0.9
1010
1.0
1011
1.1
1100
1.2
1101
1.3
1110
1.4
1111
2.4
--Set BUCK2 voltage
VBO2[3:0]
Register
V
0000
1.70
0001
1.75
0010
1.80
0011
1.85
0100
1.90
0101
1.50
0110
1.55
0111
1.60
1000
2.40
1001
2.45
1010
2.50
1011
2.55
1100
2.60
1101
2.60
1110
2.60
1111
2.60
17
Ver 0.1
NT50366
Set LX12 slew rate, LX slew rate, Low Voltage Detect threshold voltage
05H
(LVDT) Low voltage detect threshold voltage
Inst / Para
D7
D6
D5
D4
05H
0
1
0
1
Parameter
05H_C
------Default Value：LVDT=2.7V
D3
1
----
D2
1
----
D1
1
LVDT[1]
D0
0
LVDT[0]
(code)
(5Eh)
Description
-- Set the Low Voltage Detect threshold voltage
LVDT[1:0]
Register
V
00
2.5
01
2.6
10
2.7
11
2.8
18
Ver 0.1
NT50366
Set VGL/VGH/AVDD Power on Delay Time
06H
(VGL_DLY) VGL Power on Delay Time
(VGH_DLY) VGH Power on Delay Time
(AVDD_DLY) AVDD Power on Delay Time
Inst / Para
D7
D6
D5
D4
06H
0
0
0
0
Parameter 06H_C VGL_DLY[1] VGL_DLY[0] VGH_DLY[1]
Default Value：VGL_DLY=0ms ; VGH_DLY=1ms ; AVDD_DLY=5ms
Description
D3
1
VGH_DLY[0]
D2
0
AVDD_DLY[2]
D1
0
AVDD_DLY[1]
D0
1
AVDD_DLY[0]
(code)
(09h)
--Set the VGL power on delay time
VGL_DLY[1:0]
Register
ms
00
0
01
1
10
2
11
4
--Set the VGH power on delay time
VGH_DLY[1:0]
Register
ms
00
0
01
1
10
2
11
4
--Set the AVDD power on delay time
AVDD_DLY[2:0]
Register
ms
000
0
001
5
010
10
011
15
100
20
101
25
110
30
111
35
19
Ver 0.1
NT50366
Set Buck delay time and Power off Delay Time
07H
(BUK_DLY) Buck Delay Time
(PWR_OFF) Power off Delay Time
Inst / Para
D7
D6
D5
D4
07H
0
0
0
0
Parameter
07H_C VCOM_ADJ BUK_DLY[2] BUK_DLY[1]
Default Value：VCOM_ADJ=0 ; BUK_DLY=0ms ; PWR_OFF=2ms
Description
D3
0
BUK_DLY[0]
D2
0
PWR_OFF[2]
D1
0
PWR_OFF[1]
D0
1
PWR_OFF[0]
(code)
(01h)
-- VCOM_ADJ
=0; default VCOM range (VCOM range= 0.5*AVDD-3.6875 ~ 0.5*AVDD-0.5)
=1; increase VCOM range (VCOM range= 0.5*AVDD-3.1875 ~ 0.5*AVDD)
--Set buck converter delay time
BUK_DLY[2:0]
Register
ms
000
0
001
-1
010
-2
011
-3
100
0
101
1
110
2
111
3
Note: At minus case, VBO2 is earlier than VBO1
--Set power off delay time
PWR_OFF[2:0]
Register
ms
000
0
001
2
010
4
011
6
100
8
101
10
110
12
111
14
20
Ver 0.1
NT50366
Set VGM1 Voltage
08H
(VGM1) VGM1 Voltage
Inst / Para
D7
D6
08H
0
0
Parameter
08H_C
Default Value：VGM1=AVDD-0.2V
Description
D5
0
-
D4
0
VGM1[4]
D3
0
VGM1 [3]
D2
0
VGM1 [2]
D1
0
VGM1 [1]
D0
0
VGM1 [0]
(code)
(00h)
--Set VGM1 Voltage
VGM1[4:0]
VGM1
0
AVDD-0.200
1
AVDD-0.225
2
AVDD-0.250
3
AVDD-0.275
4
AVDD-0.300
5
AVDD-0.325
6
AVDD-0.350
7
AVDD-0.375
8
AVDD-0.400
9
AVDD-0.425
10
AVDD-0.450
11
AVDD-0.475
12
AVDD-0.500
13
AVDD-0.525
14
AVDD-0.550
15
AVDD-0.575
16
AVDD-0.600
17
AVDD-0.625
18
AVDD-0.650
19
AVDD-0.675
20
AVDD-0.700
21
AVDD-0.725
22
AVDD-0.750
23
AVDD-0.775
24
AVDD-0.800
25
AVDD-0.825
26
AVDD-0.850
27
AVDD-0.875
28
AVDD-0.900
29
AVDD-0.925
30
AVDD-0.950
31
AVDD-0.975
21
Ver 0.1
NT50366
Set VGM14 Voltage
09H
(VGM14) VGM14 Voltage
Inst / Para
D7
D6
09H
0
0
Parameter
09H_C
Default Value：VGM14=0.2V
Description
D5
0
-
D4
0
VGM14[4]
D3
0
VGM14 [3]
D2
0
VGM14 [2]
D1
0
VGM14 [1]
D0
0
VGM14 [0]
(code)
(00h)
--Set VGM14 Voltage
VGM14[4:0]
VGM14
0
0.200
1
0.225
2
0.250
3
0.275
4
0.300
5
0.325
6
0.350
7
0.375
8
0.400
9
0.425
10
0.450
11
0.475
12
0.500
13
0.525
14
0.550
15
0.575
16
0.600
17
0.625
18
0.650
19
0.675
20
0.700
21
0.725
22
0.750
23
0.775
24
0.800
25
0.825
26
0.850
27
0.875
28
0.900
29
0.925
30
0.950
31
0.975
22
Ver 0.1
NT50366
Set HAVDD voltage
0AH
(HAVDD) HAVDD voltage
Inst / Para
D7
D6
0AH
0
0
Parameter
0AH_C
HAVDD[6]
Default Value：HAVDD=0.5AVDD
Description
D5
1
HAVDD[5]
D4
1
HAVDD[4]
D3
1
HAVDD[3]
D2
1
HAVDD[2]
D1
1
HAVDD[1]
D0
1
HAVDD[0]
(code)
(3Fh)
--Set HAVDD voltage
Register
0000000
0000001
0000010
0000011
0000100
0000101
0000110
0000111
0001000
0001001
0001010
0001011
0001100
0001101
0001110
0001111
0010000
0010001
0010010
0010011
0010100
0010101
0010110
0010111
0011000
0011001
0011010
0011011
0011100
0011101
0011110
0011111
V
0.5*AVDD+0.7875
0.5*AVDD+0.7750
0.5*AVDD+0.7625
0.5*AVDD+0.7500
0.5*AVDD+0.7375
0.5*AVDD+0.7250
0.5*AVDD+0.7125
0.5*AVDD+0.7000
0.5*AVDD+0.6875
0.5*AVDD+0.6750
0.5*AVDD+0.6625
0.5*AVDD+0.6500
0.5*AVDD+0.6375
0.5*AVDD+0.6250
0.5*AVDD+0.6125
0.5*AVDD+0.6000
0.5*AVDD+0.5875
0.5*AVDD+0.5750
0.5*AVDD+0.5625
0.5*AVDD+0.5500
0.5*AVDD+0.5375
0.5*AVDD+0.5250
0.5*AVDD+0.5125
0.5*AVDD+0.5000
0.5*AVDD+0.4875
0.5*AVDD+0.4750
0.5*AVDD+0.4625
0.5*AVDD+0.4500
0.5*AVDD+0.4375
0.5*AVDD+0.4250
0.5*AVDD+0.4125
0.5*AVDD+0.4000
Register
0100000
0100001
0100010
0100011
0100100
0100101
0100110
0100111
0101000
0101001
0101010
0101011
0101100
0101101
0101110
0101111
0110000
0110001
0110010
0110011
0110100
0110101
0110110
0110111
0111000
0111001
0111010
0111011
0111100
0111101
0111110
0111111
HAVDD[6:0]
V
Register
0.5*AVDD+0.3875
1000000
0.5*AVDD+0.3750
1000001
0.5*AVDD+0.3625
1000010
0.5*AVDD+0.3500
1000011
0.5*AVDD+0.3375
1000100
0.5*AVDD+0.3250
1000101
0.5*AVDD+0.3125
1000110
0.5*AVDD+0.3000
1000111
0.5*AVDD+0.2875
1001000
0.5*AVDD+0.2750
1001001
0.5*AVDD+0.2625
1001010
0.5*AVDD+0.2500
1001011
0.5*AVDD+0.2375
1001100
0.5*AVDD+0.2250
1001101
0.5*AVDD+0.2125
1001110
0.5*AVDD+0.2000
1001111
0.5*AVDD+0.1875
1010000
0.5*AVDD+0.1750
1010001
0.5*AVDD+0.1625
1010010
0.5*AVDD+0.1500
1010011
0.5*AVDD+0.1375
1010100
0.5*AVDD+0.1250
1010101
0.5*AVDD+0.1125
1010110
0.5*AVDD+0.1000
1010111
0.5*AVDD+0.0875
1011000
0.5*AVDD+0.0750
1011001
0.5*AVDD+0.0625
1011010
0.5*AVDD+0.0500
1011011
0.5*AVDD+0.0375
1011100
0.5*AVDD+0.0250
1011101
0.5*AVDD+0.0125
1011110
0.5*AVDD+0.0
1011111
23
V
0.5*AVDD-0.0125
0.5*AVDD-0.0250
0.5*AVDD-0.0375
0.5*AVDD-0.0500
0.5*AVDD-0.0625
0.5*AVDD-0.0750
0.5*AVDD-0.0875
0.5*AVDD-0.1000
0.5*AVDD-0.1125
0.5*AVDD-0.1250
0.5*AVDD-0.1375
0.5*AVDD-0.1500
0.5*AVDD-0.1625
0.5*AVDD-0.1750
0.5*AVDD-0.1875
0.5*AVDD-0.2000
0.5*AVDD-0.2125
0.5*AVDD-0.2250
0.5*AVDD-0.2375
0.5*AVDD-0.2500
0.5*AVDD-0.2625
0.5*AVDD-0.2750
0.5*AVDD-0.2875
0.5*AVDD-0.3000
0.5*AVDD-0.3125
0.5*AVDD-0.3250
0.5*AVDD-0.3375
0.5*AVDD-0.3500
0.5*AVDD-0.3625
0.5*AVDD-0.3750
0.5*AVDD-0.3875
0.5*AVDD-0.4000
Register
1100000
1100001
1100010
1100011
1100100
1100101
1100110
1100111
1101000
1101001
1101010
1101011
1101100
1101101
1101110
1101111
1110000
1110001
1110010
1110011
1110100
1110101
1110110
1110111
1111000
1111001
1111010
1111011
1111100
1111101
1111110
1111111
V
0.5*AVDD-0.4125
0.5*AVDD-0.4250
0.5*AVDD-0.4375
0.5*AVDD-0.4500
0.5*AVDD-0.4625
0.5*AVDD-0.4750
0.5*AVDD-0.4875
0.5*AVDD-0.5000
0.5*AVDD-0.5125
0.5*AVDD-0.5250
0.5*AVDD-0.5375
0.5*AVDD-0.5500
0.5*AVDD-0.5625
0.5*AVDD-0.5750
0.5*AVDD-0.5875
0.5*AVDD-0.6000
0.5*AVDD-0.6125
0.5*AVDD-0.6250
0.5*AVDD-0.6375
0.5*AVDD-0.6500
0.5*AVDD-0.6625
0.5*AVDD-0.6750
0.5*AVDD-0.6875
0.5*AVDD-0.7000
0.5*AVDD-0.7125
0.5*AVDD-0.7250
0.5*AVDD-0.7375
0.5*AVDD-0.7500
0.5*AVDD-0.7625
0.5*AVDD-0.7750
0.5*AVDD-0.7875
0.5*AVDD-0.8000
Ver 0.1
NT50366
Set the OPAO voltage
0BH
(OPAO)OPAO voltage
Inst / Para
D7
D6
0Bh
0
1
Parameter
OPA[7]
OPA[6]
Default Value：OPA=0.5AVDD-1.4V
Description
D5
0
OPA[5]
D4
0
OPA[4]
D3
1
OPA[3]
D2
0
OPA[2]
D1
0
OPA[1]
D0
0
OPA[0]
(code)
(48h)
--Set the OPAO voltage
Register
00000000
00000001
00000010
00000011
00000100
00000101
00000110
00000111
00001000
00001001
00001010
00001011
00001100
00001101
00001110
00001111
00010000
00010001
00010010
00010011
00010100
00010101
00010110
00010111
00011000
00011001
00011010
00011011
00011100
00011101
00011110
00011111
00100000
00100001
00100010
00100011
00100100
00100101
00100110
00100111
00101000
00101001
00101010
00101011
00101100
00101101
00101110
00101111
00110000
00110001
V
0.5*AVDD-0.5
0.5*AVDD-0.5125
0.5*AVDD-0.5250
0.5*AVDD-0.5375
0.5*AVDD-0.5500
0.5*AVDD-0.5625
0.5*AVDD-0.5750
0.5*AVDD-0.5875
0.5*AVDD-0.6000
0.5*AVDD-0.6125
0.5*AVDD-0.6250
0.5*AVDD-0.6375
0.5*AVDD-0.6500
0.5*AVDD-0.6625
0.5*AVDD-0.6750
0.5*AVDD-0.6875
0.5*AVDD-0.7000
0.5*AVDD-0.7125
0.5*AVDD-0.7250
0.5*AVDD-0.7375
0.5*AVDD-0.7500
0.5*AVDD-0.7625
0.5*AVDD-0.7750
0.5*AVDD-0.7875
0.5*AVDD-0.8000
0.5*AVDD-0.8125
0.5*AVDD-0.8250
0.5*AVDD-0.8375
0.5*AVDD-0.8500
0.5*AVDD-0.8625
0.5*AVDD-0.8750
0.5*AVDD-0.8875
0.5*AVDD-0.9000
0.5*AVDD-0.9125
0.5*AVDD-0.9250
0.5*AVDD-0.9375
0.5*AVDD-0.9500
0.5*AVDD-0.9625
0.5*AVDD-0.9750
0.5*AVDD-0.9875
0.5*AVDD-1.0000
0.5*AVDD-1.0125
0.5*AVDD-1.0250
0.5*AVDD-1.0375
0.5*AVDD-1.0500
0.5*AVDD-1.0625
0.5*AVDD-1.0750
0.5*AVDD-1.0875
0.5*AVDD-1.1000
0.5*AVDD-1.1125
Register
00110010
00110011
00110100
00110101
00110110
00110111
00111000
00111001
00111010
00111011
00111100
00111101
00111110
00111111
01000000
01000001
01000010
01000011
01000100
01000101
01000110
01000111
01001000
01001001
01001010
01001011
01001100
01001101
01001110
01001111
01010000
01010001
01010010
01010011
01010100
01010101
01010110
01010111
01011000
01011001
01011010
01011011
01011100
01011101
01011110
01011111
01100000
01100001
01100010
01100011
V
0.5*AVDD-1.1250
0.5*AVDD-1.1375
0.5*AVDD-1.1500
0.5*AVDD-1.1625
0.5*AVDD-1.1750
0.5*AVDD-1.1875
0.5*AVDD-1.2000
0.5*AVDD-1.2125
0.5*AVDD-1.2250
0.5*AVDD-1.2375
0.5*AVDD-1.2500
0.5*AVDD-1.2625
0.5*AVDD-1.2750
0.5*AVDD-1.2875
0.5*AVDD-1.3000
0.5*AVDD-1.3125
0.5*AVDD-1.3250
0.5*AVDD-1.3375
0.5*AVDD-1.3500
0.5*AVDD-1.3625
0.5*AVDD-1.3750
0.5*AVDD-1.3875
0.5*AVDD-1.4000
0.5*AVDD-1.4125
0.5*AVDD-1.4250
0.5*AVDD-1.4375
0.5*AVDD-1.4500
0.5*AVDD-1.4625
0.5*AVDD-1.4750
0.5*AVDD-1.4875
0.5*AVDD-1.5000
0.5*AVDD-1.5125
0.5*AVDD-1.5250
0.5*AVDD-1.5375
0.5*AVDD-1.5500
0.5*AVDD-1.5625
0.5*AVDD-1.5750
0.5*AVDD-1.5875
0.5*AVDD-1.6000
0.5*AVDD-1.6125
0.5*AVDD-1.6250
0.5*AVDD-1.6375
0.5*AVDD-1.6500
0.5*AVDD-1.6625
0.5*AVDD-1.6750
0.5*AVDD-1.6875
0.5*AVDD-1.7000
0.5*AVDD-1.7125
0.5*AVDD-1.7250
0.5*AVDD-1.7375
Register
01100100
01100101
01100110
01100111
01101000
01101001
01101010
01101011
01101100
01101101
01101110
01101111
01110000
01110001
01110010
01110011
01110100
01110101
01110110
01110111
01111000
01111001
01111010
01111011
01111100
01111101
01111110
01111111
10000000
10000001
10000010
10000011
10000100
10000101
10000110
10000111
10001000
10001001
10001010
10001011
10001100
10001101
10001110
10001111
10010000
10010001
10010010
10010011
10010100
10010101
OPA[7:0]
V
Register
0.5*AVDD-1.7500 10010110
0.5*AVDD-1.7625 10010111
0.5*AVDD-1.7750 10011000
0.5*AVDD-1.7875 10011001
0.5*AVDD-1.8000 10011010
0.5*AVDD-1.8125 10011011
0.5*AVDD-1.8250 10011100
0.5*AVDD-1.8375 10011101
0.5*AVDD-1.8500 10011110
0.5*AVDD-1.8625 10011111
0.5*AVDD-1.8750 10100000
0.5*AVDD-1.8875 10100001
0.5*AVDD-1.9000 10100010
0.5*AVDD-1.9125 10100011
0.5*AVDD-1.9250 10100100
0.5*AVDD-1.9375 10100101
0.5*AVDD-1.9500 10100110
0.5*AVDD-1.9625 10100111
0.5*AVDD-1.9750 10101000
0.5*AVDD-1.9875 10101001
0.5*AVDD-2.0000 10101010
0.5*AVDD-2.0125 10101011
0.5*AVDD-2.0250 10101100
0.5*AVDD-2.0375 10101101
0.5*AVDD-2.0500 10101110
0.5*AVDD-2.0625 10101111
0.5*AVDD-2.0750 10110000
0.5*AVDD-2.0875 10110001
0.5*AVDD-2.1000 10110010
0.5*AVDD-2.1125 10110011
0.5*AVDD-2.1250 10110100
0.5*AVDD-2.1375 10110101
0.5*AVDD-2.1500 10110110
0.5*AVDD-2.1625 10110111
0.5*AVDD-2.1750 10111000
0.5*AVDD-2.1875 10111001
0.5*AVDD-2.2000 10111010
0.5*AVDD-2.2125 10111011
0.5*AVDD-2.2250 10111100
0.5*AVDD-2.2375 10111101
0.5*AVDD-2.2500 10111110
0.5*AVDD-2.2625 10111111
0.5*AVDD-2.2750 11000000
0.5*AVDD-2.2875 11000001
0.5*AVDD-2.3000 11000010
0.5*AVDD-2.3125 11000011
0.5*AVDD-2.3250 11000100
0.5*AVDD-2.3375 11000101
0.5*AVDD-2.3500 11000110
0.5*AVDD-2.3625 11000111
24
V
0.5*AVDD-2.3750
0.5*AVDD-2.3875
0.5*AVDD-2.4000
0.5*AVDD-2.4125
0.5*AVDD-2.4250
0.5*AVDD-2.4375
0.5*AVDD-2.4500
0.5*AVDD-2.4625
0.5*AVDD-2.4750
0.5*AVDD-2.4875
0.5*AVDD-2.5000
0.5*AVDD-2.5125
0.5*AVDD-2.5250
0.5*AVDD-2.5375
0.5*AVDD-2.5500
0.5*AVDD-2.5625
0.5*AVDD-2.5750
0.5*AVDD-2.5875
0.5*AVDD-2.6000
0.5*AVDD-2.6125
0.5*AVDD-2.6250
0.5*AVDD-2.6375
0.5*AVDD-2.6500
0.5*AVDD-2.6625
0.5*AVDD-2.6750
0.5*AVDD-2.6875
0.5*AVDD-2.7000
0.5*AVDD-2.7125
0.5*AVDD-2.7250
0.5*AVDD-2.7375
0.5*AVDD-2.7500
0.5*AVDD-2.7625
0.5*AVDD-2.7750
0.5*AVDD-2.7875
0.5*AVDD-2.8000
0.5*AVDD-2.8125
0.5*AVDD-2.8250
0.5*AVDD-2.8375
0.5*AVDD-2.8500
0.5*AVDD-2.8625
0.5*AVDD-2.8750
0.5*AVDD-2.8875
0.5*AVDD-2.9000
0.5*AVDD-2.9125
0.5*AVDD-2.9250
0.5*AVDD-2.9375
0.5*AVDD-2.9500
0.5*AVDD-2.9625
0.5*AVDD-2.9750
0.5*AVDD-2.9875
Register
11001000
11001001
11001010
11001011
11001100
11001101
11001110
11001111
11010000
11010001
11010010
11010011
11010100
11010101
11010110
11010111
11011000
11011001
11011010
11011011
11011100
11011101
11011110
11011111
11100000
11100001
11100010
11100011
11100100
11100101
11100110
11100111
11101000
11101001
11101010
11101011
11101100
11101101
11101110
11101111
11110000
11110001
11110010
11110011
11110100
11110101
11110110
11110111
11111000
11111001
V
0.5*AVDD-3.0000
0.5*AVDD-3.0125
0.5*AVDD-3.0250
0.5*AVDD-3.0375
0.5*AVDD-3.0500
0.5*AVDD-3.0625
0.5*AVDD-3.0750
0.5*AVDD-3.0875
0.5*AVDD-3.1000
0.5*AVDD-3.1125
0.5*AVDD-3.1250
0.5*AVDD-3.1375
0.5*AVDD-3.1500
0.5*AVDD-3.1625
0.5*AVDD-3.1750
0.5*AVDD-3.1875
0.5*AVDD-3.2000
0.5*AVDD-3.2125
0.5*AVDD-3.2250
0.5*AVDD-3.2375
0.5*AVDD-3.2500
0.5*AVDD-3.2625
0.5*AVDD-3.2750
0.5*AVDD-3.2875
0.5*AVDD-3.3000
0.5*AVDD-3.3125
0.5*AVDD-3.3250
0.5*AVDD-3.3375
0.5*AVDD-3.3500
0.5*AVDD-3.3625
0.5*AVDD-3.3750
0.5*AVDD-3.3875
0.5*AVDD-3.4000
0.5*AVDD-3.4125
0.5*AVDD-3.4250
0.5*AVDD-3.4375
0.5*AVDD-3.4500
0.5*AVDD-3.4625
0.5*AVDD-3.4750
0.5*AVDD-3.4875
0.5*AVDD-3.5000
0.5*AVDD-3.5125
0.5*AVDD-3.5250
0.5*AVDD-3.5375
0.5*AVDD-3.5500
0.5*AVDD-3.5625
0.5*AVDD-3.5750
0.5*AVDD-3.5875
0.5*AVDD-3.6000
0.5*AVDD-3.6125
Register
11111010
11111011
11111100
11111101
11111110
11111111
V
0.5*AVDD-3.6250
0.5*AVDD-3.6375
0.5*AVDD-3.6500
0.5*AVDD-3.6625
0.5*AVDD-3.6750
0.5*AVDD-3.6875
Ver 0.1
NT50366
Write register to internal EEPROM
0DH
(W_VOLT)Write current 01H~0AH commands to internal EEPROM
(W_OPA)Write current 0BH and 0CH commands to internal EEPROM
Inst / Para
D7
D6
D5
D4
D3
0DH
0
0
0
0
0
Parameter
W_VOLT
Default Value：W_VLOT=0 ; W_OPA=0
Description
D2
0
-
D1
0
-
D0
0
W_OPA
(code)
(00h)
-- Write 01H to 0AH commands to internal EEPROM
W_VOLT
Register
Action
0
No Action
1
Write
-- Write 0BH and 0CH commands to internal EEPROM
W_OPA
Register
Action
0
No Action
1
Write
25
Ver 0.1
NT50366
Turn on/off the PMU output(except LDOO), Turn on/off parity check method
0EH
(PMU_EN) Turn on/off the PMU output
Inst / Para
D7
D6
D5
D4
D3
D2
0Eh
0
0
0
0
0
0
Parameter
Default Value：PC_EN=0 ; PMU_EN=0
Description
D1
0
PC_EN
D0
0
PMU_EN
(code)
(00h)
- - Turn on/off parity check (PC) method
PC_EN
Register
MODE
0
turn off
1
turn on
- - Turn on/off the PMU output
PMU_EN
Register
MODE
0
turn off
1
turn on
26
Ver 0.1
NT50366
Application Information
Boost Converter
The boost converter is a high efficiency
current-mode PWM converter with 1.2 MHz
operation frequency. It performs fast transient
responses to generate the required power supplies
for TFT LCD panel. The high operation frequency
allows smaller components used to minimize the
thickness of LCD panel. To regulate the output
voltage is to set by I2C command. For better
stability, the slope compensation signal summed
with the current-sense signal will be compared
with the COMP voltage to determine the current
trip point and duty cycle.
Over Temperature Protection
The NT50366 has thermal protection function to
prevent the excessive power dissipation from
overheating. When the junction temperature
exceeds 160°C, IC will turn off. Once the device
cools down by approximately 20°C, IC will re-soft
start to operate normally. For continuous operation,
do not operate over the maximum junction
temperature rating around 125°C.
Programmable VCOM and Buffers
User can use I2C to control VCOM output voltage.
The VCOM buffer is used to drive the LCD
backplane VCOM. The operational amplifier
features +/- 200mA output short-circuit current,
25V/us slew rate, and 12MHz bandwidth. An
internal
short-circuit
protection
circuit
is
implemented to protect the device from output
short circuit. The VCOM buffer limits the short
circuit current while the output is directly shorted.
VGH PWM Controller
The gate-high regulator is to provide the TFT-LCD
gate on voltage. The positive charge pump can
provide a programmable output voltage.
VGL PWM Controller
The gate-low regulator is to provide the TFT-LCD
gate off voltage. The negative charge pump can
provide a programmable output voltage.
Programmable HAVDD and Buffers
User can use I2C to control VCOM output voltage.
The VCOM buffer is used to drive the LCD
backplane VCOM. The operational amplifier
features +/- 200mA output short-circuit current,
25V/us slew rate, and 12MHz bandwidth. An
internal
short-circuit
protection
circuit
is
implemented to protect the device from output
short circuit. The HAVDD buffer limits the short
circuit current while the output is directly shorted.
Buck Converter
The buck converter is a high efficiency
current-mode PWM converter with 1.2 MHz
operation frequency. The high operation frequency
allows smaller components used to minimize the
thickness of LCD panel. To regulate the output
voltage is to set by I2C command.
Soft-Start
To reduce the inrush current drawn from VIN
during start-up the boost/buck converter includes
an internal soft-start feature. During soft-start, the
internal capacitor is charged up by a current
source and the voltage across the capacitor
determines the switch current limit.
Programmable GMA and Buffer
User can use I2C to control GMA output voltages:
VGM1 and VGM14. Each gamma voltage uses a
voltage buffer to drive output. The GMA buffer
features +/- 20mA output short-circuit current,
5V/us slew rate, and 10MHz bandwidth. An
internal
short-circuit
protection
circuit
is
implemented to protect the device from output
short circuit. The GMA buffer limits the short circuit
current while the output is directly shorted.
Over/Under Voltage Protection
The NT50366 offers over-voltage and undervoltage protection to prevent the damages of the
device under abnormal operating conditions.
When output voltages reach to the OVP/UVP
threshold more than 100msec, the protection
circuitry will create a fault latch signal to shutdown
IC. To resume the device, it will need to toggle both
of EN pin and VIN (ex: 3.3V 0V 3.3V).
27
Ver 0.1
NT50366
Design Guide Line
Layout Considerations
In DC to DC converters, layout consideration is
always very important to the performance. With
improper layout, the converter will suffer from
noise problems or the loop instability. For this
reason, here are several basic guidelines which
are highly recommended to obey as following
described:
1) Bypass capacitor CIN, COUT and inductor must
be placed as close as possible to the IC or
diode.
2) Make the path or area which is flowing high
current or high speed switching minimized.
(e.g., FB-resistor, inductor-SW-diode)
3) Separate feedback trace away from the
switching node to reduce noise coupling into
feedback signal.
4) The trace between VIN and inductor is wide,
short and direct.
5) Maximize the ground plane connected to
ground pin and add some through holes to the
bottom of ground.
6) Make the ground connection of CIN, COUT as
close as possible.
7) Place some via holes under the IC to spread
heat easily.
Inductor Selection
When choosing inductors, the most important
factor to be considered is the peak current rating of
inductance. To prevent saturation current situation,
peak current rating must be higher than maximum
current input.
After considering peak current rating, the selection
of inductor value is together with physical size,
cost, DC resistance and other performance, such
as efficiency, ripple current, etc.
Diode Selection
To reach high efficiency, a good schottky diode
with fast recovery time and low forward voltage
drop is required. Make certain that the diode’s
average and peak current rating exceed the
average output current and peak inductor current,
respectively.
IDIODE(RMS ) ~ IOUT × IPEAK
Besides, ensure the diode has a reverse voltage
rating greater than maximum output voltage.
VGL Diode Selection
To prevent latch up issue, external VGL diode is
recommended to add. The required characteristic
of this diode is low forward voltage (<0.4V),
maximum forward current larger than 100mA and
reverse voltage larger than 20V.
Capacitor Selection
Choosing low ESR capacitors for the output to
minimize output voltage ripple and loop stability.
Multilayer capacitors are a good choice for this as
well. It is recommended to use the type X5R and
X7R rather than Y5V or Z5U because they can
keep their capacitance over wilder temperature
and voltage range. For output capacitor, a 10uF
capacitor or larger capacitor is sufficient for most
applications. As to input capacitor, a 10uF ceramic
capacitor can be used to shunt high frequency
ripple on the input for good input voltage filtering.
Care should be taken that the input capacitor must
be as close as possible to the input voltage pin.
28
Ver 0.1
NT50366
Package Information
Novatek cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Novatek product.
No circuit patent licenses are implied. Novatek reserves the right to change the circuitry and specifications without notice at
any time.
29
Ver 0.1
NT50366
Footprint Information
Ax
Bx
Sx
Sy
By Ay
C
P
Package
V/W/X QFN 4x4-32L
Number
of Pin
32
P
0.4
D
Ax
4.75
Ay
4.75
Footprint Dimension (mm)
Bx
By
C
D
3.25
3.25
0.75
0.25
30
D1
--
Sx
2.80
Sy
2.80
Tolerance
±0.030
Ver 0.1