MAX14727/MAX14728/ Dual-Input, Bidirectional Overvoltage MAX14731 Protector with Automatic Path Control General Description Benefits and Features The MAX14727/MAX14728/MAX14731 provide Protects Portable Devices with Dual-Input Power protection to valuable consumer circuits against two Wide Operating Input-Voltage Protection from 3V positive voltage faults up to +28V . An internal clamp also to 28V DC 5A Continuous-Current Capability protects the devices from surges up to 100V. The devices automatically select the input source, with Integrated 73m (typ) nMOSFET Switch channel A being the primary supply. Allows Flexible and Precise Design in OVLO Implementation These devices feature reverse bias-blocking capabilities. Unlike other overvoltage protectors, when the devices Wide Adjustable OVLO Threshold Range from 4V to 14V are disabled, the voltage applied to OUT does not feed back into either INA or INB. These devices also feature OTG Enables Allow OUT Supply INA/INB Preset Accurate Internal OVLO Thresholds: two OTG enable pins (OTG ENA, OTG ENB) that allow 13.75V 2% (MAX14727) OUT voltage to supply the corresponding input when OUT 10V 2% (MAX14728) is higher than the output startup voltage. 5.92V 2% (MAX14731) These overvoltage-protection devices feature high-voltage, Increases System Reliability Through Premium low on-resistance (73m, typ) internal FETs, effectively Security minimizing a voltage drop across the device. When Surge Immunity Over +100V the input voltage exceeds the overvoltage threshold, Soft-Start to Minimize In-Rush Current the internal FET is turned off to prevent damage to the Internal 15ms Startup Debounce protected components. The devices also have thermal- Thermal Shutdown Protection shutdown protection against overload conditions. Minimizes Board Space With Compact Package The overvoltage-protection threshold can be adjusted with 30-Bump, 2.6mm x 2.2mm WLP optional external resistors to any voltage between 4V and 14V. The devices automatically choose the appropriate internal trip thresholds when the overvoltage-lockout input Ordering Information appears at end of data sheet. is set lower than the external OVLO select voltage. The internal OVLO are preset to 13.75V (typ) (MAX14727), 10V (typ) (MAX14728), or 5.92V (typ) (MAX14731). The devices are specified over the extended -40C to +85C temperature range, and are available in a 30-bump, wafer-level package (WLP). Applications Smartphones Tablets e-Readers 19-7577 Rev 1 6/15MAX14727/MAX14728/ Dual-Input, Bidirectional Overvoltage MAX14731 Protector with Automatic Path Control Typical Application Circuit CHARGER PMIC/CHARGER INPUT DOCKING SYSTEM INA OUT CHARGER REVERSE STATION /TA INPUT BOOST 5V/12V 1F 0.1F CHARGER OTG ENA MAX14727 BATTERY MAX14728 OVLOA MAX14731 OUT ENB OVLOB OTG EN V IO 10k INAOK OTG EN V INBOK BUS INB USB MICRO -AB APPS 5V/12V/20V EN PROCESSOR 0.1F EN PCON PCON GND Maxim Integrated 2 www.maximintegrated.com