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參數(shù)資料
| 型號(hào)： | L5953 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.2 A SWITCHING REGULATOR, 425 kHz SWITCHING FREQ-MAX, PDSO36 |
| 封裝： | LEAD FREE, SOP-36 |
| 文件頁數(shù)： | 6/31頁 |
| 文件大?。?/td> | 420K |
| 代理商： | L5953 |
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Functional description
L5953
2
Functional description
2.1
REG1 stand-by regulator
The stand-by regulator (
Figure 7.) output voltage can be 5V or 3.3V. It is externally
selectable by means of the ADJ pin:
- leaving the ADJ pin open, the output voltage is 5V;
- connecting the ADJ pin to the Vstby pin the output voltage becomes 3.3V.
This regulator is supplied by STCAP pin and provide the reset information.
It has a current protection which limits the maximum allowable output current.
2.2
Reset
The RES pin (
Figure 8.) is an open collector that is activated (that is forced to zero) when
the stand-by regulator is not in regulation (including thermal shutdown and faults). The
indication that REG1 is in regulation is delayed by a time set up by the external capacitor CT.
When the RES is switched on, HSD1, HSD2, REG2, PWM are turned off and until the RES
is forced to zero only the REG1 and low Voltage Warnings are active.
2.3
Low voltage warning
This circuit is able to sense two different voltages through external resistors to increase the
overall flexibility. (
If S1 pin voltage is higher than Vst, the output of mos M1 is off: W1 is floating and can be
pulled up by an external resistor. If S1 pin voltage goes down and becomes lower than Vst,
the mos M1 is turned on and forces W1 to zero. The same thing happens for S2 - W2.
The outputs W1 and W2 can be connected together to get a single output.
2.4
REG2 linear voltage regulator
REG2 is a linear voltage regulator (
Figure 7.) with a dedicated supply pin VIN. The output
voltage (between 1.5V and 3.3V) is fixed by an external divider. It can be turned on/off by
SPI. It has a current protection which limits the maximum allowable output current.
2.5
High side drivers
Two high-side driver (
Figure 10.) with charge pump controlled by SPI are available inside
L5953. They are protected against short to ground: the short circuit protection limits the
maximum output current.
A diagnostic procedure is available to detect open load, short to battery and overcurrent.
Open load and short to battery can be reveal only in test mode while overcurrent is active
only during normal operation of the device. (see
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L5953_07 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Multiple switching voltage regulator |
| L5954 | 功能描述:低壓差穩(wěn)壓器 - LDO Airbag App Specific Voltage Regulator RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| L5955 | 功能描述:多媒體雜項(xiàng) Multifunction Voltage Regulator RoHS:否 制造商:Texas Instruments 類型: 通道數(shù)量: 轉(zhuǎn)換速率:540 Mbps 分辨率: 封裝 / 箱體:SOIC-16 封裝:Tube |
| L5956 | 功能描述:多媒體雜項(xiàng) Multifunction Voltage Regulator RoHS:否 制造商:Texas Instruments 類型: 通道數(shù)量: 轉(zhuǎn)換速率:540 Mbps 分辨率: 封裝 / 箱體:SOIC-16 封裝:Tube |
| L5956_11 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Multifunction voltage regulator for car radio |
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