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| 型号： | MAX17100ETM+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 27/35页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST INT-SWITCH 48-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | LCD 电视机/监控器 |
| 电源电压： | 2.5 V ~ 6 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-WFQFN 裸露焊盘 |
| 供应商设备封装： | 48-TQFN-EP（6x6） |
| 包装： | 带卷 (TR) |
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Internal-Switch Boost Regulator with Integrated Scan
Driver, VCOM Calibrator, and Op Amp for TFT LCDs
where n POS is the number of positive charge-pump
stages, V GHON is the gate-on linear-regulator (REG P)
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 number of negative charge-pump stages is given by:
Charge-Pump Output Capacitor
Increasing the output capacitance or decreasing the
ESR reduces the output ripple voltage and the peak-to-
peak transient voltage. With ceramic capacitors, the
output voltage ripple is dominated by the capacitance
value. Use the following equation to approximate the
required capacitor value:
n NEG = GOFF DROPOUT
-V + V
V MAIN -2 × V D
C OUT_CP ≥
I LOAD_CP
2f OSC V RIPPLE_CP
n POS = GHON DROPOUT IN
n NEG = GOFF DROPOUT IN
R4 = R5 × ( GHON -1)
R7 = R8 × FBN GOFF
where n NEG is the number of negative 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 , then the
above equations become:
V +V +V
V MAIN -2 × V D
- V +V +V
V MAIN -2 × V D
Flying Capacitors
Increasing the flying capacitor (C X ) value lowers the
effective source impedance and increases the output
current capability. Increasing the capacitance indefi-
nitely has a negligible effect on output-current capabili-
ty 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 x V MAIN
where n is the stage number in which the flying capaci-
tor appears and V MAIN is the output voltage of the main
step-up regulator.
where C OUT_CP is the output capacitor of the charge
pump, I LOAD_CP is the load current of the charge
pump, and V RIPPLE_CP is the peak-to-peak value of the
output ripple.
Charge-Pump Rectifier Diodes
Use low-cost silicon switching diodes with a current rat-
ing equal to or greater than two times the average
charge-pump input current. If it helps avoid an extra
stage, some or all of the diodes can be replaced with
Schottky diodes with an equivalent current rating.
Linear-Regulator Controllers
Output-Voltage Selection
Adjust the gate-on linear-regulator (REG P) output volt-
age by connecting a resistive voltage-divider from the
REG P output to AGND with the center tap connected
to FBP (Figure 2). Select the lower resistor of the divider
R5 in the range of 10k ? to 30k ? . Calculate the upper
resistor, R4, with the following equation:
V
V FBP
where V FBP = 1.25V (typ).
Adjust the gate-off linear-regulator REG N output volt-
age by connecting a resistive voltage-divider from
V GOFF to REF with the center tap connected to FBN
(Figure 2). Select R8 in the 20k ? to 50k ? range.
Calculate R7 with the following equation:
V -V
V REF - V FBN
where V FBN = 250mV, V REF = 1.25V. Note that REF can
only source up to 50μA; avoid using a resistor less than
20k ? for R8 that results in higher bias current than REF
can supply.
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