- 您现在的位置：买卖IC网 > PDF目录14390 > MAX630CSA+ (Maxim Integrated Products)IC REG BOOST 0.15A 8SOIC PDF资料下载
参数资料
| 型号： | MAX630CSA+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 6/14页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST 0.15A 8SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 100 |
| 类型： | 升压（升压） |
| 输出数： | 1 |
| 输入电压： | 2 V ~ 16.5 V |
| 频率 - 开关： | 40kHz |
| 电流 - 输出： | 150mA |
| 同步整流器： | 无 |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 管件 |
| 供应商设备封装： | 8-SOIC |
CMOS Micropower Step-Up
Switching Regulator
10 Ω ≤ R 2 ≤ 1 M Ω R 1 = R 2 x OUT
10 Ω ≤ R 4 ≤ 1 M Ω R 3 = R 4 x LB
=
I pk = = 5 V x 14 μ s = 150 mA
External Components
Resistors
Since the LBR and V FB input bias currents are specified
as 10nA (max), the current in the dividers R1/R2 and
R3/R4 (Figure 1) may be as low as 1μA without signifi-
cantly affecting accuracy. Normally R2 and R4 are
between 10k Ω and 1M Ω , which sets the current in the
voltage-dividers in the 1.3μA to 130μA range. R1 and
R3 can then be calculated as follows:
V ? 1 . 31 V
1 . 31
V ? 1 . 31 V
1 . 31
where V OUT is the desired output voltage and V LB is
the desired low-battery warning threshold.
If the I C (shutdown) input is pulled up through a resistor
rather than connected directly to +V S , the current
through the pullup resistor should be a minimum of 4μA
with I C at the input-high threshold of 1.3V:
diode (D1) as well as that in the load. If the inductance
is too low, the current at L X may exceed the maximum
rating. The minimum allowed inductor value is
expressed by:
L MIN = V IN T ON
I MAX
where I MAX ≈ 525mA (peak L X current) and t ON is the
on-time of the L X output.
The most common MAX630 circuit is a boost-mode
converter (Figure 1). When the N-channel output device
is on, the current linearly rises since:
di V
dt L
At the end of the on-time (14μs for 40kHz, 55% duty-
cycle oscillator) the current is:
V T ON
L 470 μ H
+ V S ? 1 . 3 V
R IC ≤
4 μ A
Inductor Value
The available output current from a DC-DC voltage
The energy in the coil is:
E = LI pk
2
2
= 5 . 25 μ J
( V IN T ON ) 2 f
LI pk 2 f
sin ce : P OUT =
and : I pk = V IN ON
boost converter is a function of the input voltage, exter-
nal inductor value, output voltage, and the operating
frequency.
The inductor must 1) have the correct inductance, 2) be
able to handle the required peak currents, and 3) have
acceptable series resistance and core losses. If the
inductance is too high, the MAX630 will not be able to
deliver the desired output power, even with the L X out-
put on for every oscillator cycle. The available output
power can be increased by either decreasing the
inductance or the frequency. Reducing the frequency
increases the on-period of the L X output, thereby
increasing the peak inductor current. The available out-
put power is increased since it is proportional to the
square of the peak inductor current (I PK ).
L =
2 P OUT
2
T
L
where P OUT includes the power dissipated in the catch
At maximum load, this cycle is repeated 40,000 times
per second, and the power transferred through the coil
is 40,000 x 5.25 = 210mW. Since the coil only supplies
the voltage above the input voltage, at 15V, the DC-DC
converter can supply 210mW / (15V - 5V) = 21mA. The
coil provides 210mW and the battery directly supplies
another 105mW, for a total of 315mW of output power. If
the load draws less than 21mA, the MAX630 turns on its
output only often enough to keep the output voltage at
a constant 15V.
Reducing the inductor value increases the available
output current: lower L increases the peak current,
thereby increasing the available power. The external
inductor required by the MAX630 is readily obtained
from a variety of suppliers (Table 1). Standard coils are
suitable for most applications.
Types of Inductors
Molded Inductors
These are cylindrically wound coils that look similar to
1W resistors. They have the advantages of low cost and
ease of handling, but have higher resistance, higher
losses, and lower power handling capability than other
types.
6
_______________________________________________________________________________________
相关PDF资料 |
PDF描述 |
|---|---|
| MAX634CSA+ | IC REG INV FLYBK ADJ 0.15A 8SOIC |
| ECC43DRXI | CONN EDGECARD 86POS DIP .100 SLD |
| RCM28DRYH | CONN EDGECARD 56POS DIP .156 SLD |
| ESC22DRAN | CONN EDGECARD 44POS R/A .100 SLD |
| LQW15AN4N1B00D | INDUCTOR |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX630CSA+ | 功能描述:直流/直流开关调节器 CMOS uPower Step Up Switching Reg RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MAX630CSA+T | 功能描述:直流/直流开关调节器 CMOS uPower Step Up Switching Reg RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MAX630CSA-C70048 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX630CSA-C71098 | 制造商:Maxim Integrated Products 功能描述:8 PINS N.SO PKG - Rail/Tube |
| MAX630CSA-T | 功能描述:直流/直流开关调节器 CMOS uPower Step Up Switching Reg RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
发布紧急采购，3分钟左右您将得到回复。