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MAX762ESA+T

更新时间： 2024-01-17 02:35:23
品牌 Logo 应用领域
美信 - MAXIM 信息通信管理开关光电二极管
页数 文件大小 规格书
12页 125K
描述
Switching Regulator, Current-mode, 1.5A, 300kHz Switching Freq-Max, BICMOS, PDSO8, 0.150 INCH, PLASTIC, SOIC-8

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MAX762ESA+T 技术参数

是否无铅： 不含铅是否Rohs认证： 符合
生命周期：Obsolete零件包装代码：SOIC
包装说明：SOP, SOP8,.25针数：8
Reach Compliance Code：unknownECCN代码：EAR99
HTS代码：8542.39.00.01风险等级：5.82
模拟集成电路 - 其他类型：SWITCHING REGULATOR控制模式：CURRENT-MODE
控制技术：PULSE FREQUENCY MODULATION最大输入电压：16.5 V
最小输入电压：3 VJESD-30 代码：R-PDSO-G8
JESD-609代码：e3长度：4.9 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：1.5 A
标称输出电压：15 V封装主体材料：PLASTIC/EPOXY
封装代码：SOP封装等效代码：SOP8,.25
封装形状：RECTANGULAR封装形式：SMALL OUTLINE
峰值回流温度（摄氏度）：260认证状态：Not Qualified
座面最大高度：1.75 mm子类别：Switching Regulator or Controllers
最大供电电流 (Isup)：0.11 mA表面贴装：YES
切换器配置：BOOST最大切换频率：300 kHz
技术：BICMOS温度等级：INDUSTRIAL
端子面层：Matte Tin (Sn)端子形式：GULL WING
端子节距：1.27 mm端子位置：DUAL
处于峰值回流温度下的最长时间：NOT SPECIFIED宽度：3.9 mm
Base Number Matches：1

MAX762ESA+T 数据手册

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1 2 V/1 5 V o r Ad ju s t a b le , Hig h -Effic ie n c y,  
Lo w I , Ste p-Up DC-DC Conve rte rs  
Q
L1  
18µH  
D1  
1N5817  
ADJUSTABLE  
OUTPUT (V  
L1  
18µH  
D1  
1N5817  
V
IN  
V
IN  
=
+12V at  
150mA  
)
OUT  
+5V  
C4  
V
OUT  
C1  
33µF  
C4  
33µF  
R2 = R1  
(
-1)  
V
REF  
7
7
LX  
LX  
5
4
2
3
8
REF  
SHDN  
LBI  
V+  
R2  
R1  
C1  
C2  
C3  
0.1µF  
R4  
MAX761  
MAX761  
MAX762  
8
3
1
100k  
V+  
FB  
R4  
R3  
2
5
C2  
0.1µF  
LBI  
100k  
REF  
R3  
C3  
1
4
FB  
LBO  
SHDN  
LBO  
LOW-BATTERY  
OUTPUT  
LOW-BATTERY  
DETECT OUTPUT  
GND  
6
GND  
6
1/MAX762  
LOW-BATTERY  
DETECT  
V
- V  
TRIP REF  
R4 = R3  
(
)
V
REF  
V
= 1.5V NOMINAL  
REF  
C1 = 33µF  
C2 = 0.1µF  
C3 = 0.1µF  
C4 = 33µF  
Figure 2. Bootstrapped Operating Circuit  
In non-bootstrapped mode, the IC is powered from the  
supply voltage, V , and operates with minimum supply  
IN  
Figure 3. Non-Bootstrapped Operating Circuit  
current. Since the voltage applied to the gate of the inter-  
nal FET is reduced, efficiency declines with low input  
voltages. Note: In non-bootstrapped mode, there is no  
fixed-output operation; external resistors must be  
used to set the output voltage. Use 1% external feed-  
back resistors when operating in non-bootstrapped  
mode (Figure 3).  
rent limit and a pair of one-shots that set the maximum  
on-time (8µs) a nd minimum off-time (1.3µs) for the  
switch. Once off, the minimum off-time one-shot holds  
the switch off for 1.3µs. After this minimum time, the  
switch either (1) stays off if the output is in regulation, or  
(2) turns on again if the output is out of regulation.  
Use bootstrapped mode when V is below approxi-  
IN  
mately 4V. For V between 4V and 6V, the trade-off is  
IN  
The MAX761/MAX762 also limit the peak inductor cur-  
rent, allowing the devices to run in continuous-conduc-  
tion mode (CCM) and maintain high efficiency with  
heavy loads (Figure 4a). This current-limiting feature is  
a key component of the control circuitry. Once turned  
on, the switch stays on until either (1) the maximum on-  
time one-shot turns it off (8µs later), or (2) the current  
limit is reached.  
lower supply current in non-bootstrapped mode versus  
hig he r outp ut c urre nt in b oots tra p p e d mod e (s e e  
Typical Operating Characteristics).  
P u ls e -Fre q u e n c y Mo d u la t io n  
(P FM) Co n t ro l S c h e m e  
The MAX761/MAX762 use a proprietary current-limited  
PFM control scheme. This control scheme combines  
the ultra-low supply current of pulse-skipping PFM con-  
verters with the high full-load efficiency characteristic of  
current-mode pulse-width-modulation (PWM) convert-  
ers. It allows the devices to achieve high efficiency over  
a wide range of loads, while the current-sense function  
and high operating frequency allow the use of tiny  
external components.  
To increase light-load efficiency, the current limit for the  
first two pulses is set to half the peak current limit. If  
those pulses bring the output voltage into regulation,  
the voltage comparator holds the MOSFET off, and the  
current limit remains at half the peak current limit. If the  
output voltage is still out of regulation after two pulses,  
the current limit for the next pulse is raised to the full  
current limit of 1A (Figure 4b).  
As with traditional PFM converters, the internal power  
MOSFET is turned on when the voltage comparator  
s e ns e s the outp ut is out of re g ula tion (Fig ure 1).  
However, unlike traditional PFM converters, switching is  
accomplished through the combination of a peak cur-  
In t e rn a l vs . Ex t e rn a l Re s is t o rs  
When external feedback resistors are used, an internal  
undervoltage lockout system prevents start-up until V+  
rises to about 2.7V. When external feedback resistors are  
8
_______________________________________________________________________________________  
1...56789101112

中文翻译

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MAX762ESA+T 替代型号

型号 品牌 替代类型 描述 数据表
MAX762ESA+T MAXIM

当前型号

 Switching Regulator, Current-mode, 1.5A, 300kHz Switching Freq-Max, BICMOS, PDSO8, 0.150 I
MAX762ESA+ MAXIM

类似代替

 暂无描述
MAX762CSA MAXIM

完全替代

 12V/15V or Adjustable, High-Efficiency, Low IQ, Step-Up DC-DC Converters

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