CS8121 Cherry Semiconductor Corporation, CS8121 Datasheet
CS8121
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CS8121 Summary of contents
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... Linear Regulator with RESET Description The CS8121 is a 5V, 1A precision linear regulator with two microprocessor compatible control functions and pro- tection circuitry included on chip. The composite NPN-PNP output pass tran- sistor assures a lower dropout voltage (1.2V @ 1A) without requiring exces- sive supply current (4mA). ...
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DC Input Voltage ...........................................................................................................................................................-0.7 to 26V Peak Transient Voltage (46V Load Dump).............................................................................................................................60V Output Current .................................................................................................................................................Internally Limited Electrostatic Discharge (Human Body Model) ......................................................................................................................2kV Operating, Temperature ..........................................................................................................................................-40C to 125¡C Junction Temperature...............................................................................................................................................-40C to 150¡C Storage Temperatures.............................................................................................................................................-55¡C to 150¡C Lead Temperature Soldering Wave Solder ...
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PACKAGE LEAD # 7 Lead 5 Lead TO-220 & PAK Overmolded TO-220 Output Voltage vs. Temperature 5.02 5.01 5.00V @ 25ûC 5 4.99 4.98 4.97 4.96 ...
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... IC. By adding an error amplifier into the feedback loop, the output voltage is maintained within ±4% over temperature and supply vari- ation. Output Stage OUT Figure 1. Composite Output Stage of the CS8121 Typical Performance Characteristics: continued Output Voltage and Supply Current vs. Input Voltage 5.5 5.0 4.0 3.0 2.0 1.0 ...
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... Thermal shutdown is an effective means to prevent die overheating since the power transistor is the principle heat source in the IC. Regulator Control Functions The CS8121 contains two microprocessor compatible con- ENABLE RESET trol functions: and FOR 7V < ...
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... V BAT SWITCH Figure 5. Microprocessor control of CS8121 using external switching transistor Q The circuit depicted in Figure 5 lets the microprocessor control its power source, the CS8121 regulator. An I/O port on the µP and the SWITCH port are used to drive the base of Q1. When Q1 is driven into saturation, the voltage ...
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0.1mF C *required if regulator is located far from 1 the power supply filter required for stability. 2 Figure 6: Test and application circuit showing output compensation. Step 6: Test the load transient ...
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... TYP Ordering Information Part Number Description CS8121YT5 5 Lead TO-220 Straight CS8121YTVA5 5 Lead TO-220 Vertical CS8121YTHA5 5 Lead TO-220 Horizontal CS8121YTFVA5 5 Lead Overmolded TO-220 Vertical CS8121YDPS7 7 Lead D CS8121YDPSR7 7 Lead D (tape & reel) Rev. 5/4/99 Package Specification Thermal Data R QJC R QJA 1.40 (.055) 1.14 (.045) 4 ...