參數(shù)資料
型號： MAX1620-MAX1621
廠商： Maxim Integrated Products, Inc.
英文描述： Digitally Adjustable LCD Bias Supplies
中文描述： 數(shù)字式可調(diào)LCD偏置電源
文件頁數(shù)： 11/20頁
文件大?。?/td> 253K
代理商： MAX1620-MAX1621
M
Digitally Adjustable LCD Bias S upplies
______________________________________________________________________________________
11
maximum switching frequency. The following equation
represents the output current for the ideal case (no
power losses) of Figure 5:
1
2
This means that a higher peak current is required to
achieve the same output current in the negative output
circuit as in the positive output circuit.
The output current for Figure 6 uses the same current
equation as the positive boost.
Output V oltage Control
The output voltage is set with a voltage divider to the
feedback pin (FB). For a positive output, the divider is
referred to GND; for a negative output, the divider is
referred to REF.
Output voltage can be adjusted with an internal DAC
summing current into FB through an external resistor.
The 5-bit DAC is controlled with a user-programmable
up/down counter. On power-up or after a reset, the
counter sets the DAC output to 10000 binary, or half-
scale.
I
x (k -factor / L) x V
/ (V
V
)
OUT
BATT
BATT
OUT
=
+
2V
TO
15V
BATT
POK
V
DD
POL
SHDN (SUS)
DN (SDA)
UP (SCL)
REF
AGND
N1
MMFT3055VL
3
5
11
7
4
1
2
6
12
( ) ARE FOR MAX1621.
NOTE:
CONNECTIONS TODIGITAL INPUTS NOT SHOWN.
14
16
15
13
R3
300k
R4
300k
R5
1.2M
C6
100pF
10
9
8
LX
DHI
DLO
PGND
DOUT
FB
LCDON
3V
TO
5.5V
C1
0.1
μ
F
C2
0.1
μ
F
C3
22
μ
F
C5
22
μ
F
-6V
TO
-12V OUT
L1
100
μ
H
D1
MBRS0540
D2
MBRS0540
C4
1
μ
F
MAX1620
MAX1621
U1
R8
10k
TOREF
D3 1N6263 (ANY SCHOTTKY)
2V
TO
12V
BATT
POK
V
DD
POL
SHDN (SUS)
DN (SDA)
UP (SCL)
REF
AGND
N1
MMFT3055VL
3
5
11
7
4
1
2
6
12
( ) ARE FOR MAX1621.
NOTE:
CONNECTIONS TODIGITAL INPUTS NOT SHOWN.
14
16
15
13
R3
300k
R4
300k
R5
2.7M
C6
100pF
10
9
8
LX
DHI
DLO
PGND
DOUT
FB
LCDON
3V
TO
5.5V
C1
0.1
μ
F
C2
0.1
μ
F
C3
22
μ
F
C5
22
μ
F
-13.5V
TO
-27V OUT
L1
100
μ
H
D2
MBRS0540
D1
MBRS0540
C4
2.2
μ
F
MAX1620
MAX1621
U1
R8
10k
TOREF
D3 1N6263 (ANY SCHOTTKY)
Figure 5. Typical Operating Circuit—Negative Output
Figure 6. Alternative Negative Output—Maximum Voltage
相關PDF資料
PDF描述
MAX1620EEE Digitally Adjustable LCD Bias Supplies
MAX1621EEE Digitally Adjustable LCD Bias Supplies
MAX1623 3A, Low-Voltage, Step-Down Regulator with Synchronous Rectification and Internal Switches
MAX1623EAP 3A, Low-Voltage, Step-Down Regulator with Synchronous Rectification and Internal Switches
MAX1624 High-Speed Step-Down Controllers with Synchronous Rectification for CPU Power
相關代理商/技術參數(shù)
參數(shù)描述
MAX1621EEE 功能描述:顯示驅(qū)動器和控制器 RoHS:否 制造商:Panasonic Electronic Components 工作電源電壓:2.7 V to 5.5 V 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Reel
MAX1621EEE+ 功能描述:其他電源管理 Digitally Adjustable LCD Bias Supply RoHS:否 制造商:Texas Instruments 輸出電壓范圍: 輸出電流:4 mA 輸入電壓范圍:3 V to 3.6 V 輸入電流: 功率耗散: 工作溫度范圍:- 40 C to + 110 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-48 封裝:Reel
MAX1621EEE+T 功能描述:LCD 驅(qū)動器 Digitally Adjustable LCD Bias Supply RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube
MAX1621EEE-T 功能描述:顯示驅(qū)動器和控制器 RoHS:否 制造商:Panasonic Electronic Components 工作電源電壓:2.7 V to 5.5 V 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Reel
MAX1621EPE+ 制造商:Maxim Integrated Products 功能描述:- Rail/Tube
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