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参数资料
| 型号： | MAX8795AGCJ+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 22/31页 |
| 文件大小： | 0K |
| 描述： | IC CONV DC-DC TFT-LCD 32LQFP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,000 |
| 应用： | 转换器，TFT，LCD |
| 输入电压： | 2.5 V ~ 6 V |
| 输出数： | 8 |
| 输出电压： | 2.5 V ~ 18 V |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-LQFP |
| 供应商设备封装： | 32-LQFP（7x7） |
| 包装： | 带卷 (TR) |
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TFT-LCD DC-DC Converter with
Operational Amplifiers
n POS = GON DROPOUT MAIN
The number of positive charge-pump stages is given by:
V + V ? V
V MAIN ? 2 × V D
the forward-voltage drop of the charge-pump diode,
and V DROPOUT is the dropout margin for the linear reg-
ulator. Use V DROPOUT = 0.3V.
The number of negative charge-pump stages is given by:
where n POS is the number of positive charge-pump
stages, V GON is the gate-on linear-regulator REG P out-
put, V MAIN is the main step-up regulator output, V D is
n NEG =
? V GOFF + V DROPOUT
V MAIN ? 2 × V D
where n NEG is the number of negative charge-pump
V D = 0.3V TO 1V
60
50
40
30
20
10
POSITIVE CHARGE-PUMP
OUTPUT VOLTAGE vs. V MAIN
3-STAGE CHARGE PUMP
2-STAGE CHARGE PUMP
1-STAGE CHARGE PUMP
stages, V GOFF is the gate-off linear-regulator REG N
output, V MAIN is the main step-up regulator output, V D
is the forward-voltage drop of the charge-pump diode,
and V DROPOUT is the dropout margin for the linear reg-
ulator. Use V DROPOUT = 0.3V.
The above equations are derived based on the
assumption that the first stage of the positive charge
pump is connected to V MAIN and the first stage of the
negative charge pump is connected to ground.
Sometimes fractional stages are more desirable for bet-
ter efficiency. This can be done by connecting the first
stage to V IN or another available supply. If the first
charge-pump stage is powered from V IN , the above
equations become:
n POS = GON DROPOUT IN
0
2
4
6
8
V MAIN (V)
10
12
14
V + V + V
V MAIN ? 2 × V D
Figure 8. Positive Charge-Pump Output Voltage vs. V MAIN
n NEG =
? V GOFF + V DROPOUT + V IN
V MAIN ? 2 × V D
-0
NEGATIVE CHARGE-PUMP
OUTPUT VOLTAGE vs. V MAIN
Flying Capacitors
Increasing the flying-capacitor (C X ) value lowers the
effective source impedance and increases the output-
-5
-10
-15
-20
-25
-30
-35
-40
-45
2-STAGE
CHARGE PUMP
3-STAGE
CHARGE PUMP
V D = 0.3V TO 1V
1-STAGE
CHARGE PUMP
current capability. Increasing the capacitance indefinitely
has a negligible effect on output-current capability
because the internal switch resistance and the diode
impedance place a lower limit on the source imped-
ance. A 0.1μF ceramic capacitor works well in most
low-current applications. The flying capacitor’s voltage
rating must exceed the following:
V CX > n × V MAIN
where n is the stage number in which the flying capaci-
tor appears, and V MAIN is the output voltage of the
2
4
6
8
10
12
14
main step-up regulator.
V MAIN (V)
Figure 9. Negative Charge-Pump Output Voltage vs. V MAIN
22
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