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參數(shù)資料
| 型號(hào)： | MAX679EUA |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Regulated 3.3V Charge Pump |
| 中文描述： | SWITCHED CAPACITOR REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | 1.10 MM HEIGHT, ULTRA SMALL, UMAX-8 |
| 文件頁(yè)數(shù)： | 6/6頁(yè) |
| 文件大?。?/td> | 76K |
| 代理商： | MAX679EUA |
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
6
___________________Maxim Integrated Produc ts, 120 S an Gabriel Drive, S unnyvale, CA 94086 (408) 737-7600
1997 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
M
Regulated 3.3V Charge Pump
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
cycles (about 4ms) have elapsed. The start-up
sequence begins at power-up, when exiting shutdown,
or when recovering from a short circuit. If V
IN
is less
than the 1.6V UVLO threshold, the device remains shut
down and ignores a high
SHDN
input.
__________________Design Proc edure
Optimize the charge-pump circuit for size, quiescent
current, and output ripple by properly selecting the
operating frequency and capacitors C
IN
, C1, and
C
OUT
.
For lowest output ripple, select 1MHz operation (FSET
= IN). In addition, increasing C
OUT
relative to C1 will
further reduce ripple. For highest efficiency, select
330kHz operation (FSET = GND) and select the largest
practical values for C
OUT
and C1 while maintaining a
30-to-1 ratio. See Table 1 for some suggested values
and the resulting output ripple.
Note that the capacitors must have low ESR (<20m
)
to maintain low ripple. Currently, only ceramic capaci-
tors can provide such low ESR; therefore, the output fil-
ter capacitors should be a combination of a 1μF
ceramic capacitor and a 10μF tantalum capacitor.
S mallest S ize
Set the frequency to 1MHz by connecting FSET to IN.
Table 1 shows typical external component values.
Table 1. External Component Selection
PC Board Layout
Place C1, C
OUT
, and C
IN
close to the IC. Connect
PGND and GND with a short trace.
Effic ienc y
Charge-pump efficiency is best at low frequency
(330kHz). The theoretical maximum efficiency is given
in the following equation:
Theoretical maximum efficiency = V
OUT
/ (2 x V
IN
)
Gate-charge losses amount to approximately 1mA from
the output at full switching frequency (about 5% to 7%
loss).
Table 2. Manufacturers of Low-ESR Capacitors
TRANSISTOR COUNT: 819
SUBSTRATE CONNECTED TO GND
___________________Chip Information
C1
(μF)
C
OUT
(μF)
2
2
2
2
3
3
3
3
0.33
0.33
0.1
0.1
0.33
0.33
0.1
0.1
10
10
3.3
3.3
10
10
3.3
3.3
FSET
(Hz)
Vp-p
(mV)
V
IN
(V)
1M
330k
1M
330k
1M
330k
1M
330k
7
14
16
22
27
56
72
89
X7R
(714) 960-6492
(714) 969-2491
Surface-Mount
Ceramic Capacitors
Matsuo
Sprague
593D, 595D series
X7R
(603) 224-1961
(603) 224-1430
(803) 626-3123
(803) 946-0690
AVX
MANUFACTURER
CAPACITORS
Surface-Mount
Tantalum Capacitors
AVX
TPS series
267 series
PHONE
FAX
PRODUCTION
METHOD
(803) 946-0690
(803) 626-3123
(714) 960-6492
(714) 969-2491
Matsuo
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX679EUA+ | 功能描述:電荷泵 Regulated 3.3V Charge Pump 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 |
| MAX679EUA+T | 功能描述:電荷泵 Regulated 3.3V Charge Pump 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 |
| MAX679EUA-T | 功能描述:電荷泵 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 |
| MAX6800UR26D1 | 制造商:Maxim Integrated Products 功能描述:3-PIN LOW-POWER MICROPROCESSOR RES - Rail/Tube |
| MAX6800UR26D1+T | 功能描述:監(jiān)控電路 RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
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