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参数资料
| 型号： | MAX724CCK |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 12/13页 |
| 文件大小： | 0K |
| 描述： | IC REG MULTI CONFIG ADJ TO220-5 |
| 标准包装： | 50 |
| 类型： | 降压（降压），升压（升压），反相，回扫 |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 2.5 V ~ 35 V |
| 输入电压： | 8 V ~ 40 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 100kHz |
| 电流 - 输出： | 5A |
| 同步整流器： | 无 |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 通孔 |
| 封装/外壳： | TO-220-5 |
| 包装： | 管件 |
| 供应商设备封装： | TO-220-5 |
5A/2A Step-Down, PWM,
Switch-Mode DC-DC Regulators
___________________Typical Applications
Positive-to-Negative DC-DC Inverter
ing the following relationships. If V IN does not fall below
2V OUT , then R1, R2, and C4 can be omitted and only R3
and R4 set the output voltage.
The MAX724/MAX726 can convert positive input volt-
ages to negative outputs if the sum of input and output
voltage is greater than 8V, and the minimum positive
supply is 4.5V. The connection in Figure 7 shows the
R4
R3
R1
R2
=
=
=
=
1.82k ?
|V OUT | - 2.37 (in k ? )
1.86 (R3)
3.65 (R3)
V OUT R2
R1 =
MAX724 generating -5V. The device's GND pin is con-
nected to the negative output, which allows the feed-
back divider, R3, and R4 to be connected normally. If
the GND pin were tied to circuit ground, a level shift
and inversion would be required to generate the proper
feedback signal.
Component values in Figure 8 are shown for input volt-
ages up to 35V and for a 1A output. If the maximum
input voltage is lower, a Schottky diode with lower
reverse breakdown than the MBR745 (D1) may be
used. If lower output current is needed, then the cur-
rent rating of both D1 and L1 may be reduced. In addi-
tion, if the minimum input voltage is higher than 4.5V,
then greater output current can be supplied.
R1, R2, and C4 provide compensation for low input
voltages, but R1 and R2 also figure in the output-volt-
age calculation because they are effectively connected
in parallel with R3. For larger negative outputs,
increase R1, R2, and R3 proportionally while maintain-
Negative Boost DC-DC Converter
The MAX724/MAX726 can also work as a negative
boost converter (Figure 8) by tying the GND pin to the
negative output. This allows the regulator to operate
from input voltages as low as -4.5V. If the regulated
output is at least -8V, R1 and R2 set the output volt-
age as in a conventional connection, with R1 selected
from:
- R2
2.21
L1 must be a low value to maintain stability, but if V IN is
greater than -10V, L1 can be increased to 50 μ H. Since
this is a boost configuration, if the input voltage
exceeds the output voltage, D1 will pull the output more
negative and out of regulation. Also, if the output is
pulled toward ground, D1 will drag down the input sup-
ply. For this reason, this configuration is not short-cir-
cuit protected.
V IN
+4.5V TO +35V
C1
220 μ H
50V
V IN
L1
50 μ H
5A
V IN
FB
1000pF
R1
12.7k
V SW
R1
R3
2.74k
MAX724
MAX724
5.1k
R2
10k
C2
1000 μ F
10V
C3
100 μ F
25V
GND
V SW
V C
R2
2.21k
C1
1000 μ F
25V
FB
V C GND C4
0.01 μ F
D1
0.1 μ F
D1 - MOTOROLA MBR745 C2 - NICHICON UPL1A102MRH6
C1 - NICHICON UPL1C221MRH6 L1 - COILTRONICS CTX25-5-52
ALL RESISTORS HAVE 1% TOLERANCE
R4
C3 1.82k
-5V
1A
-V IN
-4.5V TO -15V
0.01 μ F
C2
1 μ F
R3
750 ?
L1
25 μ H
D1
MBR735
V OUT
-15V
Figure 7. Positive-to-Negative DC-DC Inverter
Figure 8. Negative Step-Up DC-DC Converter
______________________________________________________________________________________
11
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX724CCM | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Current-Mode SMPS Controller |
| MAX724CKS | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Current-Mode SMPS Controller |
| MAX724ECK | 功能描述:直流/直流开关调节器 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 |
| MAX724ECK-SL | 功能描述:直流/直流开关调节器 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 |
| MAX724ECM | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Current-Mode SMPS Controller |
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