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| 型号： | MAX679EUA+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 6/6页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST SWITCHED CAP 8UMAX |
| 标准包装： | 2,500 |
| 类型： | 升压（升压），切换电容（充电泵） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 3.3V |
| 输入电压： | 1.8 V ~ 3.6 V |
| 频率 - 开关： | 330kHz ~ 1MHz |
| 电流 - 输出： | 20mA |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-uMAX |
Regulated 3.3V Charge Pump
cycles (about 4ms) have elapsed. The start-up
sequence begins at power-up, when exiting shutdown,
Table 1. External Component Selection
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 Procedure
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
V IN
(V)
2
2
2
2
3
3
3
3
C1
(μF)
0.33
0.33
0.1
0.1
0.33
0.33
0.1
0.1
C OUT
(μF)
10
10
3.3
3.3
10
10
3.3
3.3
FSET
(Hz)
1M
330k
1M
330k
1M
330k
1M
330k
Vp-p
(mV)
7
14
16
22
27
56
72
89
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.
Smallest Size
Set the frequency to 1MHz by connecting FSET to IN.
Table 1 shows typical external component values.
PC Board Layout
Place C1, C OUT , and C IN close to the IC. Connect
PGND and GND with a short trace.
Efficiency
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
PRODUCTION
METHOD
Surface-Mount
Tantalum Capacitors
Surface-Mount
Ceramic Capacitors
MANUFACTURER
AVX
Matsuo
Sprague
AVX
Matsuo
CAPACITORS
TPS series
267 series
593D, 595D series
X7R
X7R
PHONE
(803) 946-0690
(714) 969-2491
(603) 224-1961
(803) 946-0690
(714) 969-2491
FAX
(803) 626-3123
(714) 960-6492
(603) 224-1430
(803) 626-3123
(714) 960-6492
___________________Chip Information
TRANSISTOR COUNT: 819
SUBSTRATE CONNECTED TO GND
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
6 ___________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600
? 1997 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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| MAX6800UR26D1+T | 功能描述:监控电路 RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
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