Protects against overvoltage reverse supply Integrated low-power high-

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OVRB2 Overvoltage Reverse Battery Protection
Protects against overvoltage reverse supply Integrated low-power high-voltage bandgap voltage reference Overvoltage regulated down 5.8V (typ) Voltage drop <100mV IDD=10mA Designed (0.5µ) processes Description
OVRB2 integrated overvoltage regulator with reverse supply protection* designed powered from nominal supply, that required withstand misconnections supply without damage. cell especially suited automotive applications where overvoltage high maximum battery voltage (16V) reverse connection applies supply only. circuit passes positive supply voltage load whenever lower than overvoltage threshold. When overvoltage condition present VSUP, circuit uses dropout (LDO) linear regulator keep voltage load within specified voltage range. supply polarity reversed, reverse current limited safe level, protect load avoid excessive power dissipation. cell does require double-poly capacitors, resistors with high sheet resistance, thick gate devices. Therefore, used processes. Performance characteristics preliminary have been measured limited number samples.
patent pending
Performance Features
Performance Features
Nominal supply voltage VSUP Maximum overvoltage 500mW Maximum reverse battery 500mW Maximum voltage drop VSUP @10mA Regulated with overvoltage Internal bandgap voltage reference Temperature range Maximum supply current (simulated) Status
Value
5.0V 17.5V 100mV 6.0V 1.21 1.29V +150oC 350µA Functional Silicon
Cell Definition
Name
VSUP VSUP VREF VREF
Description
Positive voltage supply Ground Substrate connection Protected output voltage Bandgap voltage reference output
OVRB2
Semiconductor www.amis.com
OVRB2 Overvoltage Reverse Battery Protection
General Notes
cell allows some design modification, such centering bandgap within specified temperature range adjusting overvoltage threshold. more details, Application Notes. internal bandgap voltage reference unbuffered used with capacitive loads only. operational with VSUP supply from 16V. nominal external capacitor between required stability. should connected clean ground potential ensure low-noise operation. star connection when necessary.
Application Notes
Although designed especially automotive applications, OVRB2 used variety applications where ASIC protected against overvoltage reverse supply conditions supply pin, overvoltage needs regulated safe level. However, should emphasized that ASIC must have nominal supply. Operation with above 5.5V extended periods time recommended, potential reliability issues load being protected. OVRB2 intended used applications where normally powered directly from automotive battery, protect against other automotive conditions, such "double battery" "load dump". Some degree cell customization acceptable could provided AMIS. instance, bandgap reference recentered, regulated voltage adjusted, maximum load current voltage drop changed. Metal options available regulated voltage only, which adjusted within approximately +/-300mV. cell without voltage regulation (OVRB1) also available, recommended situations where overvoltage should simply blocked from VDD. Please contact AMIS special requirements.
Semiconductor www.amis.com
2002 Semiconductor, Inc. Semiconductor makes warranty products, other than those expressly contained company's standard warranty contained Semiconductor's Terms Conditions. company assumes responsibility errors which appear this document, reserves right change devices specifications detailed herein time without notice, does make commitment update information contained herein. licenses patents other intellectual property Semiconductor granted company connection with sale Semiconductor products, expressly implication.

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