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CS8141 Dataheets PDF



Part Number CS8141
Manufacturers Cherry Semiconductor Corporation
Logo Cherry Semiconductor Corporation
Description 5V/ 500mA Linear Regulator with ENABLE/ / and Watchdog RESET
Datasheet CS8141 DatasheetCS8141 Datasheet (PDF)

CS8140/1 CS8140/1 5V, 500mA Linear Regulator with ENABLE, RESET , and Watchdog Description The CS8140 is a 5V Watchdog Regulator with protection circuitry and three logic control functions that allow a microprocessor to control its own power supply. The CS8140 is designed for use in automotive, switch mode power supply post regulator, and battery powered systems. Basic regulator performance characteristics include a low noise, low drift, 5V ± 4% precision output voltage with low dropout voltage.

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CS8140/1 CS8140/1 5V, 500mA Linear Regulator with ENABLE, RESET , and Watchdog Description The CS8140 is a 5V Watchdog Regulator with protection circuitry and three logic control functions that allow a microprocessor to control its own power supply. The CS8140 is designed for use in automotive, switch mode power supply post regulator, and battery powered systems. Basic regulator performance characteristics include a low noise, low drift, 5V ± 4% precision output voltage with low dropout voltage (1.25V @ IOUT = 500mA) and low quiescent current (7mA @ IOUT = 500mA). On board short circuit, thermal, and overvoltage protection make it possible to use this regulator in particularly harsh operating environments. The Watchdog logic function monitors an input signal (WDI) from the microprocessor or other signal source. When the signal frequency moves outside externally programmable window limits, a RESET signal is generated ( RESET ). An external capacitor (CDELAY) programs the watchdog window frequency limits as well as the power on reset (POR) and RESET delay. The RESET function is activated by any of three conditions: the watchdog signal moves outside of its preset limits; the output voltage drops out of regulation by more than 4.5%; or the IC is in its power up sequence. The RESET signal is independent of VIN and reliable down to VOUT = 1V. In conjunction with the Watchdog, the ENABLE function controls the regulatorÕs power consumption. The CS8140Õs output stage and its attendant circuitry are enabled by setting the ENABLE lead high. The regulator goes into sleep mode (IOUT = 250µA) when the ENABLE lead goes low and the watchdog signal moves outside its preset window limits. This unique combination of control functions in the CS8140 gives the microprocessor control over its own power down sequence: i.e. it gives the microprocessor the flexibility to perform housekeeping functions before it powers down. The CS8141 has the same features as the CS8140, except that the CS8141 only responds to input signals (WDI) which are below the preset watchdog frequency threshold. Features s 5V ± 4%, 500mA Output Voltage s µP Compatible Control Functions Watchdog RESET ENABLE s Low Dropout Voltage (1.25V @ 500mA) s Low Quiescent Current (7mA @ 500mA) s Low Noise, Low Drift s Low Current SLEEP Mode (IQ = 250µA) s Fault Protection Thermal Shutdown Short Circuit 60V Peak Transient Voltage Package Options 24 Lead SOIC Wide NC Delay WDI VOUT Sense 1 RESET ENABLE NC VIN Gnd NC NC NC NC NC NC NC Block Diagram VIN Reference & Bias Overvoltage Overtemperature NC NC NC NC NC NC Gnd Regulation ENABLE WDI Control Logic ENABLE RESET Delay 14 Lead PDIP VOUT Short Circuit Undervoltage * *NOTE: shorted together on 7 Lead TO-220 7 Lead TO-220 Tab (Gnd) 1 2 3 4 5 6 7 1 Delay WDI VOUT Sense NC NC NC 1 RESET ENABLE VIN Gnd NC NC NC Sense RESET Gnd Watchdog VIN ENABLE RESET Gnd Delay WDI VOUT Delay Cherry Semiconductor Corporation 2000 South County Trail, East Greenwich, RI 02818 Tel: (401)885-3600 Fax: (401)885-5786 Email: [email protected] Web Site: www.cherry-semi.com Rev. 2/23/99 1 A ¨ Company CS8140/1 Absolute Maximum Ratings Input Voltage Operating Range .................................................................................................................................................-0.5 to +26V Peak Transient Voltage (46V Load Dump @ 14V VBAT) ..............................................................................................60V Electrostatic Discharge (Human Body Model)...............................................................................................................................................4kV WDI Input Signal Range ...............................................................................................................................................-0.3 to +7V Internal Power Dissipation ..............................................................................................................................Internally limited Junction Temperature Range (TJ) .......................................................................................................................-40¡C to +150¡C Storage Temperature Range ................................................................................................................................-65¡C to +150¡C Lead Temperature Soldering Wave Solder (through hole styles only) .....................................................................................10 sec. max, 260¡C peak Reflow (SMD styles only) ......................................................................................60 sec. max above 183¡C, 230¡C peak ENABLE .......................................................................................................................................................................-0.3V to VIN Electrical Characteristics: 7V ² VIN ² 26V, 5mA ² IOUT ² 500mA, -40ûC ² TJ ² +150ûC, -40ûC ² TA ² 125ûC .


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