Datasheet > MAX758AEPA+

MAX758AEPA+

更新时间： 2024-02-20 03:09:17

品牌	Logo	应用领域
美信 - MAXIM		开关光电二极管
页数	文件大小	规格书
16页	208K
描述
Switching Regulator, Current-mode, 2A, 190kHz Switching Freq-Max, CMOS, PDIP8, PLASTIC, DIP-8

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技术参数
数据手册

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MAX758AEPA+ 技术参数

是否无铅：	不含铅	是否Rohs认证：	符合
生命周期：	Active	零件包装代码：	DIP
包装说明：	PLASTIC, DIP-8	针数：	8
Reach Compliance Code：	compliant	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	Factory Lead Time：	6 weeks
风险等级：	1.34	其他特性：	ALSO OPERATES IN ADJUSTABLE MODE FROM TO 1.25V TO 16
模拟集成电路 - 其他类型：	SWITCHING REGULATOR	控制模式：	CURRENT-MODE
控制技术：	PULSE WIDTH MODULATION	最大输入电压：	16 V
最小输入电压：	4 V	标称输入电压：	12 V
JESD-30 代码：	R-PDIP-T8	JESD-609代码：	e3
长度：	9.375 mm	湿度敏感等级：	1
功能数量：	1	端子数量：	8
最高工作温度：	85 °C	最低工作温度：	-40 °C
最大输出电流：	2 A	标称输出电压：	5 V
封装主体材料：	PLASTIC/EPOXY	封装代码：	DIP
封装等效代码：	DIP8,.3	封装形状：	RECTANGULAR
封装形式：	IN-LINE	峰值回流温度（摄氏度）：	260
认证状态：	Not Qualified	座面最大高度：	4.572 mm
子类别：	Switching Regulator or Controllers	最大供电电流 (Isup)：	3 mA
表面贴装：	NO	切换器配置：	BUCK
最大切换频率：	190 kHz	技术：	CMOS
温度等级：	INDUSTRIAL	端子面层：	Matte Tin (Sn)
端子形式：	THROUGH-HOLE	端子节距：	2.54 mm
端子位置：	DUAL	处于峰值回流温度下的最长时间：	NOT SPECIFIED
宽度：	7.62 mm	Base Number Matches：	1

MAX758AEPA+ 数据手册

Ad ju s t a b le , S t e p -Do w n ,

Cu rre n t -Mo d e P WM Re g u la t o rs

0/MX758A

______________________________________________________________P in De s c rip t io n

8-PIN

16-PIN

NAME

FUNCTION

DIP/SO

WIDE SO

Shutdown—active low. Ground to power-down chip, tie to V+ for normal operation.

Output voltage falls to 0V when SHDN is low.

SHDN

REF

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. 510kΩ resistor from SS to SHDN provides current boost.

External voltage divider feedback point. When an external voltage divider is connected from

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.

I.C.

GND

Internal Connection. Make no external connection to this pin.

Ground*

10, 11

12, 13, 14

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.*

–

1, 15, 16

4, 5, 6

V+

N.C.

No Connect—not internally connected.

*16-Pin Wide SO: All pins with the same name must be connected together externally.

P ro g ra m m a b le S o ft -S t a rt

_______________De t a ile d De s c rip t io n

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 510kΩ. SS controls

both the soft-start timing and the maximum output cur-

rent that can be delivered while maintaining regulation.

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 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 510kΩ 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 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.

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-

s ta rt c a p a c itor to g round . A s oft-s ta rt c yc le a ls o

begins at power-up and when coming out of the shut-

down mode.

_______________________________________________________________________________________

1...4 5 678 9 10...16

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与MAX758AEPA+相关器件

型号	品牌	描述	获取价格	数据表
MAX758AEWE	MAXIM	Adjustable, Step-Down, Current-Mode PWM Regulators	获取价格
MAX758AEWE+	MAXIM	Switching Regulator, Current-mode, 2A, 160kHz Switching Freq-Max, CMOS, PDSO16, 0.300 INCH	获取价格
MAX758AEWE+T	MAXIM	Switching Regulator, Current-mode, 2A, 160kHz Switching Freq-Max, CMOS, PDSO16, 0.300 INCH	获取价格
MAX758AEWE-T	MAXIM	Switching Regulator, Current-mode, 2A, 190kHz Switching Freq-Max, CMOS, PDSO16, PLASTIC, S	获取价格
MAX758AMJA	MAXIM	Adjustable, Step-Down, Current-Mode PWM Regulators	获取价格
MAX758C/D	MAXIM	Current-Mode SMPS Controller	获取价格

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