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参数资料
| 型号： | MAX1974EUB+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 12/15页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 1A 10UMAX |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.75 V ~ 5.5 V |
| 输入电压： | 2.6 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1.4MHz |
| 电流 - 输出： | 1A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 包装： | 管件 |
| 供应商设备封装： | 10-µMAX |
Smallest 1A, 1.4MHz Step-Down Regulators
V IN = 2.6V TO 5.5V
IN
LX
3.3 μ H
1.8V
V IN = 2.6V TO 5.5V
IN
LX
3.3 μ H
1.25V TO V IN
4.7 μ F
36k ?
COMP
FB
4.7 μ F
4.7 μ F
R C
COMP
FB
R1
4.7 μ F
470pF
FBSEL
MAX1973
CTL1
C C
FBSEL
MAX1973
CTL1
R2
0.1 μ F
SS
GND
CTL2
PGND
0.1 μ F
SS
GND
CTL2
PGND
Figure 2. MAX1973 with 1.8V Preset Output
Figure 4. MAX1973 with Adjustable Output Voltage Set by R1
and R2
V IN = 2.6V TO 5.5V
IN
LX
3.3 μ H
1.5V
V IN = 2.6V TO 5.5V
IN
LX
3.3 μ H
0.75V TO V IN
4.7 μ F
43k ?
330pF IN
COMP
FBSEL MAX1974
FB
ON
IN
100k ?
4.7 μ F
4.7 μ F
C C
R C
COMP
FBSEL
MAX1974
FB
ON
IN
R1
R2
4.7 μ F
IN
0.1 μ F
SS
GND
POK
PGND
POK
0.1 μ F
SS
GND
POK
PGND
100k ?
POK
I RMS = OUT V OUT IN OUT )
( V ? V
Figure 3. MAX1974 with Preset 1.5V Output
where f SW is the switching frequency (1.4 ? 10 6 Hz), and
LIR is the inductor ripple current as a percentage of the
maximum load current. Keep LIR between 20% and
40% for best compromise of cost, size, and perfor-
mance. The peak inductor current is approximately:
? LIR ?
I L ( PEAK ) = ? 1 + ? × I OUT ( MAX )
? ?
? 2 ?
Input Capacitor
A 4.7μF ceramic input capacitor is recommended for
most applications because of its low equivalent series
resistance (ESR), equivalent series inductance (ESL),
and cost. To ensure stability over a wide temperature
range, an X5R or X7R dielectric is recommended.
The input capacitor reduces peak currents drawn from
the power source and reduces noise and voltage ripple
on the input caused by the circuit ’ s switching. The input
Figure 5. MAX1974 with Adjustable Output Voltage Set by R1
and R2
capacitor must meet the ripple current requirement
(I RMS ) imposed by the switching currents defined by
the following equation:
I
V IN
Choose a capacitor that exhibits less than 10 ° C tem-
perature rise at the maximum operating RMS current for
optimum long-term reliability.
Output Capacitor
A 4.7μF ceramic output capacitor is recommended for
most applications because of its low ESR, ESL, and
lower cost. To ensure stability over a wide temperature
range, an X5R or X7R dielectric is recommended.
Key selection parameters for a ceramic output capacitor
are capacitance, ESR, and voltage rating. These affect
the overall stability, output ripple voltage, and transient
12
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1974EUB+ | 功能描述:直流/直流开关调节器 1A 1.4MHz Step-Down Regulator 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 |
| MAX1974EUB+T | 功能描述:直流/直流开关调节器 1A 1.4MHz Step-Down Regulator 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 |
| MAX1974EUB-G05 | 功能描述:电流型 PWM 控制器 RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX1974EUB-T | 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 |
| MAX1974EUB-TG05 | 功能描述:电流型 PWM 控制器 RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
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