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| 型号： | MAX758AEWE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 7/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 0.75A 16SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1,000 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.25 V ~ 16 V |
| 输入电压： | 4 V ~ 16 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 160kHz |
| 电流 - 输出： | 750mA |
| 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： | 16-SOIC（0.295"，7.50mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 16-SOIC W |
Adjustable, Step-Down,
Current-Mode PWM Regulators
______________________________________________________________Pin Description
PIN
8-PIN
DIP/SO
1
2
3
16-PIN
WIDE SO
2
3
7
NAME
SHDN
REF
SS
FUNCTION
Shutdown—active low. Ground to power-down chip, tie to V+ for normal operation.
Output voltage falls to 0V when SHDN is low.
Reference Voltage Output (+1.22V) supplies up to 100μA for external loads. Bypass to
GND with a capacitor that does not exceed 0.047μF.
Soft-Start. Capacitor between SS and GND provides soft-start and short-circuit protec-
tion. 510k ? resistor from SS to SHDN provides current boost.
External voltage divider feedback point. When an external voltage divider is connected from
4
8
CC
the output voltage to CC and GND, this pin becomes the feedback input for adjusting the
output voltage. Connect a 330pF compensation capacitor between the output and CC.
5
6
7
8
–
9
10, 11
12, 13, 14
1, 15, 16
4, 5, 6
I.C.
GND
LX
V+
N.C.
Internal Connection. Make no external connection to this pin.
Ground*
Drain of internal P-channel power MOSFET*
Supply Voltage Input. Bypass to GND with 1.0μF ceramic and large-value electrolytic capaci-
tors in parallel. The 1μF capacitor must be as close to the V+ and GND pins are possible.*
No Connect—not internally connected.
*16-Pin Wide SO: All pins with the same name must be connected together externally.
_______________Detailed Description
The MAX750A/MAX758A switch-mode regulators use a
current-mode pulse-width-modulation (PWM) control
system coupled with a simple step-down (buck) regula-
tor topography. Input voltages range from 4V to 11V for
the MAX750A, and from 4V to 16V for the MAX758A.
The current-mode PWM architecture provides cycle-by-
cycle current limiting, improved load transient response
characteristics, and simpler outer-loop design.
The controller consists of two feedback loops: an inner
(current) loop that monitors the switch current via the
current-sense resistor and amplifier, and an outer (volt-
age) loop that monitors the output voltage through the
error amplifier (Figure 1). The inner loop performs
cycle-by-cycle current limiting, truncating the power-
transistor on-time when the switch current reaches a
predetermined threshold. This threshold is determined
by the outer loop. For example, a sagging output volt-
age produces an error signal that raises the threshold,
allowing the circuit to store and transfer more energy
during each cycle.
Programmable Soft-Start
Figures 1 and 2 show a capacitor and a resistor connect-
ed to the soft-start (SS) pin to ensure an orderly power-
up. Typical values are 0.1μF and 510k ? . SS controls
both the soft-start timing and the maximum output cur-
rent that can be delivered while maintaining regulation.
The charging capacitor slowly raises the clamp on the
error-amplifier output voltage, limiting surge currents at
power-up by slowly increasing the cycle-by-cycle current-
limit threshold. The 510k ? resistor sets the soft-start
clamp at a value high enough to maintain regulation, even
at currents exceeding 1A. This resistor is not necessary
for lower current loads. Refer to the Maximum Output
Current vs. Supply Voltage, No. R1 graph in the Typical
Operating Characteristics. Table 1 lists timing character-
istics for selected capacitor values and circuit conditions.
The overcurrent comparator trips if the load exceeds
approximately 1.5A. A soft-start cycle begins when
either an undervoltage or overcurrent fault condition
triggers an internal transistor to discharge the soft-
start capacitor to ground. A soft-start cycle also
begins at power-up and when coming out of the shut-
down mode.
_______________________________________________________________________________________
7
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX758AMJA | 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 |
| MAX758C/D DIE | 制造商:Maxim Integrated Products 功能描述: |
| MAX758CPA | 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 |
| MAX758CWE | 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 |
| MAX758CWE-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 |
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