Electronic Components Datasheet Search |
|
G528AP1U Datasheet(PDF) 6 Page - Global Mixed-mode Technology Inc |
|
G528AP1U Datasheet(HTML) 6 Page - Global Mixed-mode Technology Inc |
6 / 8 page Ver: 1.2 May 17, 2005 TEL: 886-3-5788833 http://www.gmt.com.tw 6 G528/G528A Global Mixed-mode Technology Inc. Functional Description The G528/G528A is high-side 1-channel switch with active-low enable input. Fault conditions turn off or inhibit turn-on of the output transistors. Input and Output IN (input) is the power supply connection to the logic circuitry and the source of the output MOSFET. OUT (output) is the drain of the output MOSFET. In a typical application, current flows through the switch from IN to OUT toward the load. All OUT pins must be connected together to the load. The output MOSFET and driving circuit are also de- signed to allow the MOSFET drain to be externally forced to a higher voltage than the source (VOUT > VIN) when the switch is off. In this situation, the G528/G528A avoids undesirable drain-to-body diode current flow by connecting the body to the most posi- tive voltage. If VOUT >VIN when switch is enabled, cur- rent will flow from VOUT to VIN. Thermal Shutdown Thermal shutdown protects G528/G528A from exces- sive power dissipation. If the die temperature exceeds 135°C, the MOSFETS switch is shut off. 10°C of hys- tersis prevents the switch from turning on until the die temperature drops to 125°C. Thermal shutdown circuit functions only when the switch is enabled. Undervoltage Lockout UVLO (undervoltage lockout) prevents the output MOSFET from turning on until IN (input voltage) ex- ceeds 2.5V typically. After the switch turns on, if the voltage drops below 2.3V typically, UVLO shuts off the output MOSFET. UVLO detection functions only when the switch is enabled. Current Sensing and Limiting The current limit threshold is preset internally. The preset level prevents damage to the output MOSFET and external load but allows a minimum current of 0.5A through the output MOSFET. A current sense circuit senses the output current of MOSFET switch. If output current exceeds the current limit threshold, the output MOSFET switch is shut off. The reaction to an overcurrent is measured with the following scenarios: Switch Enabled into Heavy Load If the switch is powered on or enabled into a heavy load or short-circuit, the switch immediately goes into a constant-current mode, reducing the output voltage. See the "Enable into Short Circuit" graph. Heavy Load Applied to Enabled Switch When a heavy load is applied, a large current may flow from the switch. The current limit circuit may shut the switch off briefly, then fold back into con- stant-current mode. See the “Short Applied to Output” graph and the "Ramped Load to Enable Device" graph. Fault Flag FLG is a 2-channel, open-drain MOSFET output. Thefault-flag is active (low) for one or more of the fol- lowing conditions: current limiting, undervoltage, or thermal shutdown. The flag output MOSFET is capa- ble of sinking a 10mA load to typically 100mV above ground. Applications Information Supply filtering A 0.1µF to 1µF bypass capacitor from IN to GND as shown in Figure 1, located near the G528/G528A, is strongly recommended to control supply transients. Without a bypass capacitor, an output short may cause sufficient ringing on the input (from supply lead inductance) to damage internal control circuitry. Input transients must not exceed the absolute maxi- mum supply voltage (VIN max = 6V) even for a short du- ration. Figure 1. Supply Bypassing EN GND OUT IN G528 3.0V to 5.5V 0.1 µF to 1 µF off on EN GND OUT IN G528 3.0V to 5.5V 0.1 µF to 1 µF off on |
Similar Part No. - G528AP1U |
|
Similar Description - G528AP1U |
|
|
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 |