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參數(shù)資料
| 型號： | MAX768EEE |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Low-Noise, Dual-Output, Regulated Charge Pump for GaAsFET, LCD, and VCO Supplies |
| 中文描述： | SWITCHED CAPACITOR REGULATOR, 100 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | QSOP-16 |
| 文件頁數(shù)： | 7/12頁 |
| 文件大小： | 101K |
| 代理商： | MAX768EEE |
M
Low-Noise, Dual-Output, Regulated Charge Pump
for GaAsFET, LCD, and VCO Supplies
_______________________________________________________________________________________
7
_______________Detailed Desc ription
The MAX768 requires only seven external capacitors to
implement a regulated voltage doubler/inverter. These
can be ceramic or polarized electrolytic capacitors rang-
ing from 2.2μF to 47μF. Figure 1 is a functional diagram of
the MAX768. The applied input voltage (V
IN
) is first dou-
bled to a value of 2V
IN
by a capacitor charge pump and
then stored in the V+ reservoir capacitor. Next, the volt-
age at V+ is inverted to -2V
IN
and stored at the V- reser-
voir capacitor. The voltages at V+ and V- are then linear
regulated and appear at POUT and NOUT, respectively.
The ripple noise induced by the doubling and inverting
charge pump is reduced by the linear regulators to
1.2mVp-p for POUT and 1.7mVp-p for NOUT. In addition,
the linear regulator’s excellent AC rejection attenuates
noise from the incoming supply. A minimum of 5mA is
available at each output. When NOUT is more negative
than 90% of the regulated output voltage, the open-drain
RDY
output pulls to GND.
The charge pump operates in three modes: when
SYNC
= GND, the charge pump operates at 25kHz; when
SYNC
= IN, it operates at 100kHz, or
SYNC
can be over-
driven with an external clock in the 20kHz to 240kHz
range. The clock must have a 40% to 60% duty cycle.
__________Applic ations Information
S etting the Output V oltage
Connect SETP or SETN directly to GND to select a fixed
+5V or -5V output voltage, respectively (Figure 2).
Select an alternative voltage for either output by con-
necting SETP or SETN to the midpoint of a resistor volt-
age divider from POUT or NOUT, respectively, to GND
(Figure 3). (2 x V
IN
) must be 1.0V above the absolute
value of the output voltage to ensure proper regulation.
Calculate the output voltage from the formulas below.
Choose R1 and R3 at between 100k
to 400k
.
where V
PSET REF
= 1.25V (typical) and
V
NSET REF
= -1.25V (typical).
R2 = R1
R4 = R3
)
V
V
V
V
POUT
PSET REF
NOUT
NSET REF
1
1
MAX768
VOLTAGE
DOUBLER
+1.25V
REF
-1.25V
SHDN
POUT
SETP
CONNECT TOGND
TOSET V
POUT
= +5V
CONNECT TOGND
TOSET V
NOUT
= -5V
GND
RDY
SETN
NOUT
IN
V+
C1+
C1-
PSHDN
SYNC
NSHDN
C2+
C2-
N
N
P
V-
VOLTAGE
INVERTER
Figure 1. Functional Diagram
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX768EEE+ | 功能描述:電荷泵 Charge Pump Dl RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube |
| MAX768EEE+T | 功能描述:電荷泵 Charge Pump Dl RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube |
| MAX768EEE-T | 功能描述:電荷泵 Charge Pump Ut, Regulated Charge RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube |
| MAX768EEE-TG074 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX769EEI | 功能描述:PMIC 解決方案 2-3 Cell Step-Up/Dwn 2-Way Pgr System IC RoHS:否 制造商:Texas Instruments 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel |
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