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参数资料
| 型号： | MAX629ESA-T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 7/12页 |
| 文件大小： | 0K |
| 描述： | IC REG MULTI CONFIG +/-28V 8SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 升压（升压），反相，回扫，Sepic |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | ±28V |
| 输入电压： | 2.7 V ~ 5.5 V |
| 频率 - 开关： | 300kHz |
| 电流 - 输出： | 500mA |
| 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-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-SOIC |
28V, Low-Power, High-Voltage,
Boost or Inverting DC-DC Converter
Setting the Current Limit
External current-limit selection provides added control
over the MAX629’s output performance. A higher cur-
rent limit increases the amount of energy stored in the
inductor during each cycle, which provides a higher
output current capability. For higher output current
applications, choose the 500mA current-limit option by
connecting ISET to V CC . When lower output current is
required, the 250mA current limit can provide several
advantages. First, a smaller inductor can be used,
which saves board area and cost. Second, the smaller
energy transfer per cycle reduces output ripple for a
given capacitor, providing design flexibility between
board area, cost, and output ripple by allowing cheap-
er, higher-ESR capacitors. Connect ISET to GND to
select the 250mA current-limit option.
Inductor Selection
The MAX629’s high switching frequency allows for the
use of a small inductor. The 47μH inductor shown in the
V IN
+0.8V
TO +24V
Typical Operating Circuit is recommended for most
applications. Larger inductances reduce the peak
inductor current, but may limit output current capability
at low input voltages and provide slower start-up times.
Smaller inductances require less board space, but may
cause greater peak current due to current-sense com-
parator propagation delay. If input voltages below 2V
will be common, reducing the inductance to 22μH
might improve performance; however, maximum load
current and efficiency may decline. It is important to
thoroughly test operation under all input and output
conditions to ensure proper component selection.
Inductors with a ferrite core or equivalent are recom-
mended; powder iron cores are not recommended for
use with high switching frequencies. The inductor ’s
incremental saturation rating must exceed the selected
current limit. For highest efficiency, use an inductor with
a low DC resistance (under 100m ? ). See Table 1 for a
list of inductor suppliers.
V IN
+0.8V
TO +15V
V CC
+2.7V
TO +5.5V
*
C3
0.1 μ F
C1
10 μ F
35V
L1
47 μ H
V CC
+2.7V
TO +5.5V
*
C3
0.1 μ F
C1
10 μ F
35V
L1
47 μ H
SHDN
V CC
LX
D1
MBR0540L
V OUT
+24V
SHDN
V CC
LX
C5
2.2 μ F
R3
2 ?
D1 = D2 = MBR0540L
ISET MAX629
POL
FB
R1
576k
1%
R2
31.6k
1%
C F
150pF
C2
10 μ F
35V
ISET
POL
MAX629 FB
D2
R1
576k
1%
R2
D1
CF
150pF
V OUT
-20V
C2
10 μ F
35V
35.7k
C4
0.1 μ F
REF
GND
GND
REF
C4
0.1 μ F
1%
* FOR SINGLE-SUPPLY OPERATION
*FOR SINGLE-SUPPLY OPERATION
Figure 2. +24V for a Positive LCD Bias
* FOR SINGLE-SUPPLY OPERATION
*FOR SINGLE-SUPPLY OPERATION
Figure 3. -20V for a Negative LCD Bias
_______________________________________________________________________________________
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| MAX629ESA-TG068 | 制造商:Maxim Integrated Products 功能描述:28V, LOW-POWER, HIGH-VOLTAGE BOOST OR INVERTI - Tape and Reel |
| MAX629EVKIT | 功能描述:直流/直流开关转换器 Evaluation Kit for the MAX629 RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
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| MAX63___T | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Dual/Triple-Voltage ??P Supervisory Circuits |
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