36V System Power Supply with Watchdog Timer for Automotive Applications
R5110S is the system power supply and supervisor IC based on the high-voltage CMOS process technology, and has high accuracy and ultra low supply current voltage.
R5110S consists of a voltage regulator (VR), a voltage detector (VD), and a normal / window type of watchdog timer (WDT) in a chip, and can provide three functions of the system power supply, the supply voltage supervisor, and the supervision of system’s misoperation.
Voltage Regulator allows the output current of 500mA. And, VR has the inrush current protection circuit for rising pulse (Typ.400mA or less).
Voltage Detector outputs a reset signal when a reduction of supply voltage (SENSE / VOUT) is detected, and the reset signal is used as system reset. The detection voltage is internally fixed in an IC. And, the delay time is adjustable with an external capacitor because VD has the built-in release delay circuit (the power-on reset circuit).
When the supply voltage is higher than the release output voltage, VD maintains the reset state during the delay time. The output type of RESETB and DOUT are Nch open-drain. In addition, R5110Sxx2C and R5110Sxx2D (Detector with SENSE pin) have a manual reset (MR) pin.
Watchdog Timer detects the microprocessor output pulse. In addition to the normal type of WDT (R5110Sxx1A / R5110Sxx2C) that outputs a reset signal when the detected pulse period is longer than normal, R5110S supports the window type of WDT (R5110Sxx1B / R5110Sxx2D) that outputs a reset signal when the detected pulse period is shorter or longer. RESETB outputs the reset signal when using R5110Sxx1A / R5110Sxx1B, and the WDO pin outputs “L” as the reset signal when using R5110Sxx2C / R5110Sxx2D. The output type of WDO is Nch open-drain. In addition, R5110Sxx2C and R5110Sxx2D have an inhibiting (INH) pin to stop the watchdog timer’s monitoring function. The time out period of Watchdog Timer is also adjustable with an external capacitor.
R5110S supports the packages of HSOP-8E and HSOP-18.
|Operating Voltage Range (Maximum Rating)||3.5V to 36.0V (50.0V)|
|Operating Temperature Range||−40°C to 125°C|
|Supply Current||Typ. 25µA|
|Supply Current (On standby)||Typ. 0.1µA|
|<Voltage Regulator (VR)>||Output Voltage Range||1.8V to 5.0V|
|Dropout Voltage||Typ. 0.5V (VOUT= 5.0V, 500mA)|
|Output Voltage Accuracy||±1.5% (−40°C ≤ Ta ≤ 125°C)|
|Output Voltage Temperature Coefficient||Typ. ±100ppm/°C|
|Built-in Short Current Limit Circuit||Typ. 80mA|
|Built-in Overcurrent Protection Circuit||Min. 500mA|
|Built-in Thermal Shutdown Circuit||Typ.165°C|
|Recommended Ceramic Capacitor||0.1µF or more|
|<Voltage Detector (VD)>||Detector Threshold Range
||1.6V ~ 5.5V|
|Detector Threshold Accuracy||±1.8% (−40°C ≤ Ta ≤ 125°C)|
|Release Delay Accuracy||±20% (−40°C ≤ Ta ≤ 125°C)|
|Release Delay Time||Typ. 242ms (CD = 0.22µF)
Delay Time is adjustable with an external capacitor.
|<Watchdog Timer (WDT)>||Open Window Accuracy||±20% (−40°C ≤ Ta ≤ 125°C)|
|Open Window Time||Typ.18ms (CTW = 10nF)|
|Closed Window Time||Typ.18ms (CTW = 10nF)|
|Long Open Window Time||Typ.72ms (CTW = 10nF)|
|Ignoring Time||Typ.18ms (CTW = 10nF)|
|Monitoring Time||Typ.18ms (CTW = 10nF)|
||Typ.9.5ms (CTW = 10nF)
Each time is adjustable with an external capacitor.
- ・Power source for car accessories including car audio equipment, car navigation system, and ETC system.
- ・Power source for control units including EV inverter and charge control.
|Data Sheet||Package||Quality Assurance Data||Suffix||Composition & Content*1|
|HSOP-8E||Contact us*1||-KE||Sn (Sn: 100%)|
|HSOP-18||Contact us*1||-KE||Sn (Sn: 100%)|
- *1The composition of the product cannot be specified.
- *2The reliability information is not listed for devices above rank2. Please contact Ricoh sales representatives for further informations.