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參數(shù)資料
| 型號(hào)： | MAX860 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 50mA, Frequency-Selectable, Switched-Capacitor Voltage Converters(50mA,高達(dá)250KHz的振蕩頻率,電荷泵電壓轉(zhuǎn)換器) |
| 中文描述： | 50mA、頻率可選的開關(guān)電容電壓變換器 |
| 文件頁(yè)數(shù)： | 7/12頁(yè) |
| 文件大小： | 116K |
| 代理商： | MAX860 |
M
50mA, Frequenc y-S elec table,
S witc hed-Capac itor Voltage Converters
_______________________________________________________________________________________
7
0
Flying Capacitor, C1
Increasing the size of the flying capacitor reduces the
output resistance.
Output Capacitor, C2
Increasing the size of the output capacitor reduces the
output ripple voltage. Decreasing its ESR reduces both
output resistance and ripple. Smaller capacitance val-
ues can be used if one of the higher switching frequen-
cies is selected, if less than the maximum rated output
current (50mA) is required, or if higher ripple can be
tolerated. The following equation for peak-to-peak rip-
ple applies to both the inverter and doubler circuits.
I
OUT
V
RIPPLE
= ———————— + 2 x I
OUT
x ESR
C2
2 x f
S
x C2
Bypass Capacitor
Bypass the incoming supply to reduce its AC impedance
and the impact of the MAX860/MAX861’s switching
noise. The recommended bypassing depends on the cir-
cuit configuration and where the load is connected.
When the inverter is loaded from OUT to GND or the
doubler is loaded from V
DD
to GND, current from the
supply switches between 2 x I
OUT
and zero. Therefore,
use a large bypass capacitor (e.g., equal to the value
of C1) if the supply has a high AC impedance.
When the inverter and doubler are loaded from V
DD
to
OUT, the circuit draws 2 x I
OUT
constantly, except for
short switching spikes. A 0.1μF bypass capacitor is
sufficient.
Casc ading Devic es
Two devices can be cascaded to produce an even
larger negative voltage, as shown in Figure 1. The
unloaded output voltage is nominally -2 x V
IN
, but this is
reduced slightly by the output resistance of the first
device multiplied by the quiescent current of the sec-
ond. The output resistance of the complete circuit is
approximately five times the output resistance of a sin-
gle MAX860/MAX861.
Three or more devices can be cascaded in this way,
but output resistance rises dramatically, and a better
solution is offered by inductive switching regulators
(such as the MAX755, MAX759, MAX764, or MAX774).
Connect LV as with a standard inverter circuit (see Pin
Description.
Paralleling Devic es
Paralleling multiple MAX860s or MAX861s reduces the
output resistance. As illustrated in Figure 2, each
device requires its own pump capacitor (C1), but the
reservoir capacitor (C2) serves all devices. C2’s value
should be increased by a factor of n, where n is the
number of devices. Figure 2 shows the equation for cal-
culating output resistance. An alternative solution is to
use the MAX660 or MAX665, which are capable of sup-
plying up to 100mA of load current. Connect LV as with
a standard inverter circuit (see Pin Description.
Combined Doubler/Inverter
In the circuit of Figure 3, capacitors C1 and C2 form the
inverter, while C3 and C4 form the doubler. C1 and C3
are the pump capacitors; C2 and C4 are the reservoir
capacitors. Because both the inverter and doubler use
part of the charge-pump circuit, loading either output
causes both outputs to decline towards GND. Make
sure the sum of the currents drawn from the two out-
puts does not exceed 60mA. Connect LV as with a
standard inverter circuit (see Pin Description.
MANUFACTURER
PHONE
FAX
DEVICE TYPE
AVX
(207) 282-5111
(800) 282-4975
(207) 283-1941
Surface mount, TPS series
Matsuo
(714) 969-2491
(714) 960-6492
Surface mount, 267 series
Nichicon
USA: (708) 843-7500
J apan: 81-7-5231-8461
USA: (708) 843-2798
J apan: 81-7-5256-4158
Through-hole, PL series
Sanyo
USA: (619) 661-6835
J apan: 81-7-2070-6306
USA: (619) 661-1055
J apan: 81-7-2070-1174
Through-hole, OS-CON series
Sprague
(603) 224-1961
(603) 224-1430
Surface mount, 595D series
United Chemi-Con
(714) 255-9500
(714) 255-9400
Through-hole, LXF series
Table 4. Low-ESR Capacitor Manufacturers
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX861 | 50mA, Frequency-Selectable, Switched-Capacitor Voltage Converters(50mA,高達(dá)250KHz的振蕩頻率,電荷泵電壓轉(zhuǎn)換器) |
| MAX8621YETG | Dual Step-Down DC-DC Power-Management ICs for Portable Devices |
| MAX8621Y | Dual Step-Down DC-DC Power-Management ICs for Portable Devices |
| MAX8621ZETG | Dual Step-Down DC-DC Power-Management ICs for Portable Devices |
| MAX863 | Dual, High-Efficiency, PFM, Step-Up DC-DC Controller(雙輸出,高效,PFM,步升DC-DC變換器) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX8600AETD+T | 功能描述:電池管理 Single-Input 1-Cell Li+ Charger With Ovp RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| MAX8600ETD+ | 制造商:Maxim Integrated Products 功能描述:PROT LI-ION/LI-POL 1A 4.2V 14TDFN EP - Rail/Tube |
| MAX8600ETD+T | 功能描述:電池管理 Single-Input 1-Cell Li+ Charger With Ovp RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| MAX8600ETD-T | 制造商:Maxim Integrated Products 功能描述:SINGLE-INPUT, 1-CELL LI+ CHARGER W. OVP PROTE - Tape and Reel |
| MAX8601ETD | 制造商:Maxim Integrated Products 功能描述:USB/AC-ADAPTER/DUAL-INPUT 1-CELL LI - Rail/Tube |
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