SC1531ACSTRT, SC1532, SC1534 Selling Leads, Datasheet
MFG:SEMTECH Package Cooled:SOP-8 D/C:06+
SC1531ACSTRT, SC1532, SC1534 Datasheet download
Part Number: SC1531ACSTRT
MFG: SEMTECH
Package Cooled: SOP-8
D/C: 06+
SC1531ACSTRT, SC1532, SC1534
- Table of contents:
Info of SC1531ACSTRT
Info of SC1532
Info of SC1534
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About SC100
PDF/DataSheet Download
Datasheet: SC100
File Size: 2737062 KB
Manufacturer: Motorola, Inc
Download : Click here to Download
About SC1532
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Datasheet: SC1532
File Size: 128873 KB
Manufacturer: SEMTECH [Semtech Corporation]
Download : Click here to Download
About SC1534
PDF/DataSheet Download
Datasheet: SC1534
File Size: 108858 KB
Manufacturer: SEMTECH [Semtech Corporation]
Download : Click here to Download
SC1532 General Description
Intended for applications such as Power Managed PCI, the SC1532 is designed to maintain a glitch-free 3.3V output when at least one of two inputs, 5V (VIN1) and 3.3V (VIN2), is present.
The SC1532 combines a 5V to 3.3V linear regulator with an integral 3.3V bypass switch, along with logic and detection circuitry to control which supply provides the power for the output.
Whenever VIN1 exceeds a predetermined threshold value, the internal 3.3V PMOS linear regulator is enabled, and the internal pass NMOS is turned off. When VIN1 falls below a lower threshold value, the NMOS pass device is turned on and the PMOS linear regulator is turned off. This ensures an uninterrupted 3.3V output even if VIN1 falls out of specification.
When both supplies are simultaneously available, the PMOS linear regulator will be turned on, and the NMOS pass will be turned off, thus preferentially supplying the output from the 5V supply.
The internal 5V detector has its upper threshold (for VIN1 rising) set to 4.18V (typical) while the lower threshold (for VIN falling) is at 4.1V (typical) giving a hysteresis of approximately 80mV.
The SC1532 is available in the popular SO-8 surface mount package.
The SC1532 combines a 5V to 3.3V linear regulator with an integral 3.3V bypass switch, along with logic and detection circuitry to control which supply provides the power for the output.
Whenever VIN1 exceeds a predetermined threshold value, the internal 3.3V PMOS linear regulator is enabled, and the internal pass NMOS is turned off. When VIN1 falls below a lower threshold value, the NMOS pass device is turned on and the PMOS linear regulator is turned off. This ensures an uninterrupted 3.3V output even if VIN1 falls out of specification.
When both supplies are simultaneously available, the PMOS linear regulator will be turned on, and the NMOS pass will be turned off, thus preferentially supplying the output from the 5V supply.
The internal 5V detector has its upper threshold (for VIN1 rising) set to 4.18V (typical) while the lower threshold (for VIN falling) is at 4.1V (typical) giving a hysteresis of approximately 80mV.
The SC1532 is available in the popular SO-8 surface mount package.
SC1532 Maximum Ratings
| Parameter | Symbol | Maximum | Units |
| Input Supply Voltage | VIN,VIN2 | -0.5 to +7 | V |
| Charge Pump Capacitor Pin Voltage | CP | -0.5 to +16 | V |
| Output Current | IO | 400 | mA |
| Operating Ambient Temperature Range |
TA | -5 to +70 | °C |
| Operating Junction Temperature Range |
TJ | -5 to +125 | °C |
| Storage Temperature Range | TSTG | -65 to +150 | °C |
| Lead Temperature (Soldering) 10 sec | TLEAD | 300 | °C |
| Thermal Impedance Junction to Ambient(1) | JA | 65 | °C/W |
| ESD Rating (Human Body Model) |
ESD | 4 | kV |
SC1532 Features
• Glitch-free transition between input sources
• Internal logic selects input source
• 5V detector with hysteresis
• 1% regulated output voltage accuracy
• 400mA load current capability
SC1532 Typical Application
• Desktop Computers
• Network Interface Cards (NICs)
• PCMCIA/PCI Interface Cards
• Peripheral Cards
SC1532 Connection Diagram
SC1534 General Description
The SC1534 is designed to maintain a glitch-free 3.3V output when at least one of two inputs, 5V (VIN) and 3.3V (VAUX), is present.
Whenever VIN exceeds a predetermined threshold value, the internal 3.3V linear regulator is enabled, and DR is pulled high.
When VIN falls below a lower threshold value, DR is pulled low and the internal linear regulator is turned off. DR has been designed to drive the gate of an external low threshold P-channel MOSFET, which can be used to connect the 3.3V supply directly to the regulator output. This ensures an uninterrupted 3.3V output even if VIN falls out of specification. A maximum RDS(ON) of 200m is recommended.
When both supplies are simultaneously available, the drive pin (DR) will be pulled High, turning off the external PMOS switch.
The internal 5V detector has its upper threshold (for VIN rising) set to 4.22V (typical) while the lower threshold (for VIN falling) is at 4.05V (typical) giving a hysteresis of approximately 170mV.
The SC1534 is available in the popular SO-8 and 5-lead TO-263 surface mount packages.
SC1534 Maximum Ratings
| Parameter | Symbol | Maximum | Units |
| Input Supply Voltage | VIN | -0.5 to +7 | V |
| Auxiliary Supply Voltage | VAUX | -0.5 to +7 | V |
| LDO Output Current | IO | 10 to 400 | mA |
| Operating Ambient Temperature Range |
TA | -5 to +70 | °C |
| Operating Junction Temperature Range |
TJ | -5 to +125 | °C |
| Storage Temperature Range | TSTG | -65 to +150 | °C |
| Lead Temperature (Soldering) 10 sec | TL | 300 | °C |
| Thermal Impedance, Junction to Ambient SO-8(1) TO-263 |
JA | 65 60 |
°C/W |
| Thermal Impedance Junction to Case SO-8 TO-263 |
JC | 39 3 |
°C/W |
| ESD Rating | ESD | 2 | kV |
SC1534 Features
• Glitch-free transition between input sources
• Internal logic selects input source
• Gate drive for external PMOS bypass switch
• 5V detector with hysteresis
• 1% regulated output voltage accuracy
• 400mA load current capability
• SO-8 and TO-263 packages
SC1534 Typical Application
• Desktop Computers
• Network Interface Cards (NICs)
• PCMCIA/PCI Interface Cards
• CardbusTM Technology
• Power supplies with multiple input sources
SC1534 Connection Diagram
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