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| 型号： | MAX750AESA+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 0.45A 8SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 100 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.25 V ~ 11 V |
| 输入电压： | 4 V ~ 11 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 170kHz |
| 电流 - 输出： | 450mA |
| 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： | 管件 |
| 供应商设备封装： | 8-SOIC |
Adjustable, Step-Down,
Current-Mode PWM Regulators
V IN
SHDN
V+
C2
1μF
C3 *
OVERCURRENT COMPARATOR
BIAS
GEN
SLOPE COMPENSATION
RAMP
C5
MAX750A
MAX758A
Σ
GEN
RSENSE
330pF
R2
CC
ERROR
AMP
R
F/F
Q
CURRENT
SENSE AMP
R1
510K
R3
1.23V
BANDGAP
PWM
COMPARATOR
S
LX
L1
V OUT
C6
0.01μF
REF
1M
±35%
OSC
D1
1N5817
C4 *
C1
SS
SS CLAMP
UNDERVOLTAGE
LOCKOUT
0.1μF
VUVLO
GND
* SEE TABLE 3 FOR COMPONENT VALUES AND SUPPLIERS.
Figure 1. Detailed Block Diagram with External Components
Overcurrent Limiting
The overcurrent comparator triggers when the load cur-
rent exceeds approximately 1.5A. On each clock
cycle, the output FET turns on and attempts to deliver
current until cycle-by-cycle or overcurrent limits are
exceeded. Note that the soft-start capacitor must be
greater than 0.01μF for overcurrent protection to func-
tion properly. A typical value is 0.1μF. A soft-start
cycle is initiated when the overcurrent comparator is
triggered.
Undervoltage Lockout
The undervoltage lockout feature monitors the supply
voltage at V+ and allows operation to start when V+
rises above 3.75V. When V+ falls, operation continues
until the supply voltage falls below 3.50V. When an
undervoltage condition is detected, control logic turns
off the output power FET and discharges the soft-start
capacitor to ground. This prevents partial turn-on of
the power MOSFET and avoids excessive power dissi-
pation. The control logic holds the output power FET
off until the supply voltage rises above approximately
3.75V, at which time a soft-start cycle begins.
Shutdown Mode
The MAX750A/MAX758A are shut down by keeping
SHDN at ground. In shutdown mode, the output power
FET is held off and the output drops to 0V. The internal
reference also turns off, which causes the soft-start
capacitor to discharge. The 6μA typical standby cur-
rent includes external-component leakage currents. As
temperature increases past +85°C, the external capaci-
8
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX750AESA+ | 功能描述:直流/直流开关调节器 Adjustable PWM 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 |
| MAX750AESA+T | 功能描述:直流/直流开关调节器 Adjustable PWM 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 |
| MAX750AESA-T | 功能描述:直流/直流开关调节器 Adjustable PWM 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 |
| MAX750AMJA | 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 |
| MAX750CPA | 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 |
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