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參數(shù)資料
| 型號(hào)： | 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(yè)數(shù)： | 8/12頁(yè) |
| 文件大?。?/td> | 101K |
| 代理商： | MAX768EEE |
M
Low-Noise, Dual-Output, Regulated Charge Pump
for GaAsFET, LCD, and VCO Supplies
8
_______________________________________________________________________________________
S hutdown
The MAX768 has two active-low, TTL logic-level shut-
down inputs:
PSHDN
and
NSHDN
. When both inputs
are pulled low, the MAX768 shuts down and the supply
current is reduced to 10μA max over temperature.
Pulling
PSHDN
low turns off the positive linear regula-
tor; the doubler charge pump remains active. Pulling
the
NSHDN
input low while
PSHDN
remains high turns
off the inverter charge pump, the negative linear regula-
tor, and the output-ready indicator (Table 1).
Capac itors
The overall dropout voltage is a function of the charge
pump’s output resistance and the voltage drop across
the linear regulator. The charge-pump output resistance
is a function of the switching frequency and the capaci-
tor’s ESR value. Therefore, minimizing the charge-pump
capacitors’ ESR minimizes dropout voltage.
See Table 2 for capacitor selection. All capacitors
should be either surface-mount ceramic chip or tanta-
lum. External capacitor values may be adjusted to opti-
mize size, performance, and cost.
PSHDN
Positive output active
Positive output active
Positive output inactive
1
0
1
1
1
0
POUT
STATUS
NSHDN
Negative output active
Negative output inactive
Negative output active
Shutdown (low-power mode)
NOUT
STATUS
0.8
0.7
0.3
SUPPLY
CURRENT
(mA)
0.0001
Shutdown (low-power mode)
0
0
100
IN
20 to 240
External Clock
SYNC
INPUT
25
GND
FREQUENCY
(kHz)
2.2μF
10μF
C = 220μF/f (kHz)
10μF
4.7μF
CAPACITORS
C1, C2, C3, C4
C5, C6
C7
Figure 2. MAX768 Standard Application Circuit
Table 1. Shutdown-Control Logic
Table 2. Charge-Pump Capacitor Selection
(Figure 2)
MAX768
C1-
GND
C4
C3
C2
C1
C7
C5
C6
C2-
V-
NOUT
SETN
NSHDN
PSHDN
SEE TABLE 2 FOR CAPACITOR VALUES
C2+
V
IN
TO
V
IN
-5V
+5V
IN
C1+
V+
POUT
SETP
RDY
SYNC
R
84
8 C1
C3
2
f
C1
R
84
8 C1
2
4 C2
(C4
)
f
C1
1
f
C2
POUT
ESR
ESR
OSC
NOUT
ESR
ESR
ESR
OSC
OSC
=
+
+
)
+
)
+
)
+
)
+
=
+
+
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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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