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参数资料
| 型号： | MAX1620-MAX1621 |
| 厂商： | Maxim Integrated Products, Inc. |
| 英文描述： | Digitally Adjustable LCD Bias Supplies |
| 中文描述： | 数字式可调LCD偏置电源 |
| 文件页数： | 11/20页 |
| 文件大小： | 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
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PDF描述 |
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| MAX1620EEE | Digitally Adjustable LCD Bias Supplies |
| MAX1621EEE | Digitally Adjustable LCD Bias Supplies |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1621EEE | 功能描述:显示驱动器和控制器 RoHS:否 制造商:Panasonic Electronic Components 工作电源电压:2.7 V to 5.5 V 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:QFN-44 封装:Reel |
| MAX1621EEE+ | 功能描述:其他电源管理 Digitally Adjustable LCD Bias Supply RoHS:否 制造商:Texas Instruments 输出电压范围: 输出电流:4 mA 输入电压范围:3 V to 3.6 V 输入电流: 功率耗散: 工作温度范围:- 40 C to + 110 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-48 封装:Reel |
| MAX1621EEE+T | 功能描述:LCD 驱动器 Digitally Adjustable LCD Bias Supply RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
| MAX1621EEE-T | 功能描述:显示驱动器和控制器 RoHS:否 制造商:Panasonic Electronic Components 工作电源电压:2.7 V to 5.5 V 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:QFN-44 封装:Reel |
| MAX1621EPE+ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
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