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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)： | 9/12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
_______________________________________________________________________________________
9
S witc hing-Frequenc y Control
For applications sensitive to the MAX768’s internal
switching frequency, connect an external TTL/CMOS
(within IN and GND) clock to SYNC. The clock must be
a 20kHz to 240kHz square wave between 40% and
60% duty cycle.
S c hottky Diodes
When under heavy loads, where POUT is sourcing into
NOUT (i.e., load current flows from POUT to NOUT,
rather than from supply to ground), do not allow NOUT
to pull above ground. In applications where large cur-
rents from POUT to NOUT are likely, use a Schottky
diode (1N5817) between GND and NOUT, with the
anode connected to GND (Figure 4).
Connect a IN5817-type Schottky diode from C2- to V-
to assure proper start-up.
Layout and Grounding
Good layout is important, primarily for good noise per-
formance:
1) Mount all components as close together as possi-
ble.
2) Keep traces short to minimize parasitic inductance
and capacitance. This includes connections to
SETP and SETN.
3) Use a ground plane.
Noise and Ripple Measurement
Accurately measuring output noise and ripple can be
difficult. Brief differences in ground potential between
the circuit and the oscilloscope (which result from the
charge pump’s switching action) cause ground cur-
rents in the probe’s wires, inducing sharp voltage
spikes. For best results, measure directly across output
capacitor C3, C4, C5, or C6. Do not use the oscillo-
scope probe’s ground lead; instead, remove the
cover’s ground lead and touch the ground ring on the
probe directly to the ground terminal of C3, C4, C5, or
C6. Or, use a Tektronix chassis-mount test jack (part
no. 131-0258) to connect your scope probe directly.
This direct connection provides the most accurate
noise and ripple measurement.
MAX768
IN
SYNC
C2
C1
V
IN
C1+
C1-
C2+
C3
C5
C6
R2
R1
R3
R4
C4
V
NOUT
= (-1.25) (1 + R3
C2-
NSHDN
PSHDN
POUT
SETP
V+
GND
V-
SETN
NOUT
RDY
V
POUT
= (1.25) (1+ R1
Figure 3. MAX768 Adjustable Configuration
MAX768
GND
NOUT
Figure 4. A Schottky diode protects the MAX768 when a large
current flows from POUT to NOUT.
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| 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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