Electronic Components Datasheet Search |
|
MAX15008ATJ+ Datasheet(PDF) 13 Page - Maxim Integrated Products |
|
MAX15008ATJ+ Datasheet(HTML) 13 Page - Maxim Integrated Products |
13 / 23 page Detailed Description The MAX15008/MAX15010 integrate a 300mA LDO voltage regulator, a voltage tracker, and an OVP con- troller. These devices operate over a wide 5V to 40V supply voltage range and are able to withstand load- dump transients up to 45V. The MAX15008/MAX15010 feature a 300mA LDO regu- lator that consumes less than 70µA of current under light-load conditions and feature a fixed 5V or an adjustable output voltage (1.8V to 11V). Connect FB_LDO to ground to select a fixed 5V output voltage or select the LDO output voltage by connecting an external resistive voltage-divider at FB_LDO. The regu- lator sources at least 300mA of current and includes a current limit of 330mA (min). Enable the LDO by pulling EN_LDO high. The tracker can be powered from the LDO input sup- ply voltage or an independent voltage source. It is designed to supply power to a remote sensor and is able to handle the severe conditions in automotive applications. Set the tracker output voltage by con- necting a resistive voltage-divider to OUT_TRK and connecting ADJ to the tracking source. The tracker feedback, FB_TRK, and a separate tracker reference voltage input, ADJ, offer the flexibility of setting the tracker output to be lower, equal to, or higher than the main (LDO) output. Pull EN_TRK to SGND to turn the tracker off and keep the device in always-on, low- quiescent-current operation. The OVP controller (MAX15008 only) relies on an exter- nal MOSFET with adequate voltage rating (VDSS) to protect downstream circuitry from overvoltage tran- sients. The OVP controller drives the gate of the exter- nal n-channel MOSFET, and is configurable to operate as an overvoltage protection switch or as a closed-loop voltage limiter. GATE Voltage (MAX15008 Only) The MAX15008 uses a high-efficiency charge pump to generate the GATE voltage for the external n-channel MOSFET. Once the input voltage, VIN, exceeds the undervoltage lockout (UVLO) threshold, the internal charge pump fully enhances the external n-channel MOSFET. An overvoltage condition occurs when the voltage at FB_PROT goes above the threshold voltage, VTH_PROT. After VTH_PROT is exceeded, GATE is quick- ly pulled to PGND with a 63mA pulldown current. The MAX15008 includes an internal clamp from GATE to SOURCE that ensures that the voltage at GATE never exceeds one diode drop below SOURCE during gate discharge. The voltage clamp also prevents the GATE- to-SOURCE voltage from exceeding the absolute maxi- mum rating for the VGS of the external MOSFET in case the source terminal is accidentally shorted to 0V. Overvoltage Monitoring (MAX15008 Only) The OVP controller monitors the voltage at FB_PROT and controls an external n-channel MOSFET, isolating, or limiting the load during an overvoltage condition. Operation in OVP switch mode or limiter mode depends on the connection between FB_PROT and the external MOSFET. Overvoltage Switch Mode When operating in OVP switch mode, the FB_PROT divider is connected to the drain of the external MOSFET. The feedback path consists of the voltage- divider tapped at FB_PROT, FB_PROT’s internal comparator, the internal gate charge pump/gate pulldown, and the external n-channel MOSFET (Figure 1). When the programmed overvoltage threshold is exceeded, the internal comparator quickly pulls GATE to ground and turns off the external MOSFET, disconnecting the power source from the load. In this configuration, the voltage at the source of the MOSFET is not monitored. When the voltage at FB_PROT decreases below the overvoltage threshold, the MAX15008 raises the voltage at GATE, reconnecting the load to the power source. Automotive 300mA LDO Voltage Regulators with Tracker Output and Overvoltage Protector ______________________________________________________________________________________ 13 IN VIN FB_PROT SGND GATE SOURCE PROTECTOR OUTPUT MAX15008 Figure 1. Overvoltage Switch Configuration (MAX15008) |
Similar Part No. - MAX15008ATJ+ |
|
Similar Description - MAX15008ATJ+ |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |