- 您现在的位置：买卖IC网 > PDF目录219502 > S-1137B12-U5T1G 1.2 V FIXED POSITIVE LDO REGULATOR, 0.67 V DROPOUT, PDSO5 PDF资料下载
参数资料
| 型号： | S-1137B12-U5T1G |
| 元件分类： | 固定正电压单路输出LDO稳压器 |
| 英文描述： | 1.2 V FIXED POSITIVE LDO REGULATOR, 0.67 V DROPOUT, PDSO5 |
| 封装： | LEAD FREE, SOT-89, 5 PIN |
| 文件页数： | 14/47页 |
| 文件大小： | 500K |
| 代理商： | S-1137B12-U5T1G |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页当前第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页
HIGH RIPPLE-REJECTION LOW DROPOUT SOFT-START FUNCTION CMOS VOLTAGE REGULATOR
Rev.2.0_01
S-1137 Series
Seiko Instruments Inc.
21
7.
Soft-start function
The S-1137 Series has a soft-start circuit to suppress the rush current (IRUSH) and overshoot of the output voltage
generated at power-on the application or at turn-on the ON / OFF pin.
After immediately power-on the application or at turn-on the ON / OFF pin, the output voltage slowly rises. The time
that the output voltage rises to 99% (tSS) is adjustable by a capacitor (CSS) externally connected between the SSC and
VSS pins. When CSS = 1 nF, the time is 0.7 ms (typ.). When the ON / OFF pin is off, the electric charge charged in the
external capacitor (CSS) will be discharged by the discharge shunt transistor.
The soft-start time (tSS) is defined by time consonants of the built-in constant current (approx. 1 μA) and the external
capacitor (CSS):
tSS (ms) = soft-start coefficient × CSS (nF)
The soft-start coefficient (25
°C) is as follows.
Min. : 0.4,
Typ. : 0.7,
Max. : 1.2
Input
voltage
(VIN)
SSC pin
voltage
(VSSC)
Output
voltage
(VOUT)
VOUT × 0.99
t [ms]
Soft-start time (tSS)
approx.0.7 V
Figure 20
The rush current can be suppressed greatly by the soft-start function.
As the value of the external capacitor is larger, the rush current decreases more.
Figure 21 shows the waveform example of the rush current.
Input
voltage
(VIN)
Rush
current
(IRUSH)
t [ms]
Without soft-start : about 400 mA at the peak
With soft-start : about 20 mA at the peak
Figure 21
Waveform Example of Rush Current
相关PDF资料 |
PDF描述 |
|---|---|
| S-1137B12-U5T1U | 1.2 V FIXED POSITIVE LDO REGULATOR, 0.67 V DROPOUT, PDSO5 |
| S-1137B19-I6T2G | 1.9 V FIXED POSITIVE LDO REGULATOR, 0.42 V DROPOUT, PDSO6 |
| S-1137B19-I6T2U | 1.9 V FIXED POSITIVE LDO REGULATOR, 0.42 V DROPOUT, PDSO6 |
| S-1137B19-M5T1S | 1.9 V FIXED POSITIVE LDO REGULATOR, 0.42 V DROPOUT, PDSO5 |
| S-1137B19-M5T1U | 1.9 V FIXED POSITIVE LDO REGULATOR, 0.42 V DROPOUT, PDSO5 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| S-1137B13-M5T1S | 制造商:Seiko Instruments Inc (SII) 功能描述: |
| S-1137B13-U5T1G | 制造商:Seiko Instruments Inc (SII) 功能描述: |
| S-1137B14-I6T2G | 制造商:Seiko Instruments Inc (SII) 功能描述:LINEAR LDO REG HI 60UA IQ 300MA IOUT |
| S-1137B14-M5T1S | 制造商:Seiko Instruments Inc (SII) 功能描述: |
| S-1137B15-I6T2U | 功能描述:IC REG LINEAR 300MA SNT6A 制造商:ablic u.s.a. inc. 系列:* 包装:剪切带（CT） 零件状态:在售 稳压器数:1 电流 - 输出:300mA 工作温度:-40°C ~ 85°C（TA） 安装类型:表面贴装 封装/外壳:6-SMD，扁平引线 供应商器件封装:SNT-6A（H） 标准包装:1 |
发布紧急采购，3分钟左右您将得到回复。