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参数资料
| 型号： | MAX1621EEE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/20页 |
| 文件大小： | 0K |
| 描述： | IC TEMP SENSOR W/ALARM 16QSOP |
| 标准包装： | 2,500 |
| 应用： | LCD 显示器 |
| 电流 - 电源： | 150µA |
| 电源电压： | 3 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-QSOP |
| 包装： | 带卷 (TR) |
Digitally Adjustable LCD Bias Supplies
2V
TO
15V
R8
10k
C3
22 μ F
L1
100 μ H
D1
MBRS0540
D3 1N6263 (ANY SCHOTTKY)
TO REF
-6V
U1
3V
TO
5.5V
C1
0.1 μ F
C2
0.1 μ F
3
5
11
7
4
1
2
6
12
POL MAX1621 PGND
SHDN (SUS)
DN (SDA) DOUT
UP (SCL) FB
REF
AGND LCDON
( ) ARE FOR MAX1621.
BATT LX
POK DHI
V DD MAX1620 DLO
14
16
15
13
10
9
8
R3
300k
C4
1 μ F
N1
MMFT3055VL
R4
300k
D2
MBRS0540
R5
1.2M
C5
22 μ F
TO
-12V OUT
C6
100pF
NOTE: CONNECTIONS TO DIGITAL INPUTS NOT SHOWN.
Figure 5. Typical Operating Circuit—Negative Output
2V
TO
12V
R8
10k
C3
22 μ F
L1
100 μ H
D2
D3 1N6263 (ANY SCHOTTKY)
TO REF
MBRS0540
-13.5V
MAX1620
3V
TO
5.5V
C1
0.1 μ F
C2
0.1 μ F
3
5
11
7
4
1
2
6
12
BATT U1 LX
POL MAX1621 PGND
SHDN (SUS)
DN (SDA) DOUT
UP (SCL) FB
REF
AGND LCDON
( ) ARE FOR MAX1621.
POK DHI
V DD DLO
14
16
15
13
10
9
8
R3
300k
C4
2.2 μ F
N1
MMFT3055VL
R4
300k
D1
MBRS0540
R5
2.7M
C5
22 μ F
TO
-27V OUT
C6
100pF
NOTE: CONNECTIONS TO DIGITAL INPUTS NOT SHOWN.
Figure 6. Alternative Negative Output—Maximum Voltage
maximum switching frequency. The following equation
represents the output current for the ideal case (no
power losses) of Figure 5:
Output Voltage Control
The output voltage is set with a voltage divider to the
feedback pin (FB). For a positive output, the divider is
I OUT =
1
2
x (k - factor / L) x V BATT / (V BATT + V OUT )
referred to GND; for a negative output, the divider is
referred to REF.
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 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.
______________________________________________________________________________________
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