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AMS3132M-XX-PG Datasheet(PDF) 8 Page - Advanced Monolithic Systems Ltd |
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AMS3132M-XX-PG Datasheet(HTML) 8 Page - Advanced Monolithic Systems Ltd |
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8 / 10 page  AMS3132 3A Fast Transient Linear Regulator 02/11/2010 www.advanced-monolithic.com Phone (925) 443-0722 8 Fax (925) 443-0723 Device Summary The AMS3132 is a high voltage low drop out linear regulator with a current capability of up to 3A. The LDO has a recommended operating input voltage range of 1.5V to 7V with an output voltage as low as 0.6V and is stable with a wide range of ceramic, tantalum, and electrolytic output capacitors. Shutdown/Enable The Enable (on/off) input threshold voltage is 1.2V. When disabled the LDO quiescent current decreases to a typical value of <1µA. Fault Protection Short circuit and over-temperature shutdown disable the converter and LDO in the event of an overload condition. Over-temp shutdown disables the device when the junction temperature exceeds 145 ºC. The output current is internally limited to 6A typical. Input Capacitor An input bypass capacitor ranging from 1µF to 22µF is required. The capacitor should be placed as close as possible to the device and not be placed more than 1 inch from the LDO. Output Capacitor The output capacitor requirements range from the minimum value required to guarantee stability to larger values required to meet the extreme transient response requirements. Values range from 10 to 22µF X5R ceramic capacitors. Due to the extreme voltage coefficient of X5R ceramic capacitors, the voltage rating should be at least double the maximum applied voltage. Adjustable Version: Feedback Resistor Selection Choosing AMS3132 with adjustable output voltage option allows the user to select an output voltage by using an external resistor divider. AMS 3132 uses a 0.6V reference voltage at the positive terminal of the error amplifier. To set the output voltage a programming resistor from the adjust pin (ADJ) to ground must be selected (See Pg.1). A 10kΩ resistor is a good selection for a programming resistor R1. A higher value may result in an excessively sensitive feedback node while a lower value will draw more current and degrade the light load efficiency. The equation for selecting the voltage specific resistor is: R2= Vout Vref -1 ·R1 = 5V 0.6V -1 ·10kΩ=73.2kΩ Table 1: Adjustable Feedback Resistor values Vout (V) R2 (kΩ) (R1=10kΩ) 1.8 20.0 2.5 31.6 3.3 45.3 5.0 73.2 Power Good Version During operation, fault conditions can occur unexpectedly. Such conditions include input voltage dropout (low VIN), overheating, or overloading (excessive output current). If any of these conditions occurs, the PG pin will set an “error flag”. The PG pin, which is an open-collector output, will go LOW when VOUT is less than 95% or the specified output voltage. When the voltage at VOUT is greater than 95% of the specified output voltage, the PG pin is HIGH. A logic pull-up resistor of 10KΩ is recommended at this output. The pin can be left disconnected if unused. PCB Layout The following guidelines should be followed to insure proper layout. 1. VIN Capacitor. A low ESR ceramic bypass capacitor must be placed as close to the IC as possible. 2. Adjustable (ADJ) Feedback Resistors. The adjustable feedback resistors should be placed as close as possible the IC. Minimize the length of the trace from the feedback pin to the resistors. This is a high impedance node susceptible to interference from external RF noise sources 3. Ground. 4. For good thermal performance vias are required to couple the tab of the TO-263 package to the PCB ground plane. The via diameter should be 0.3mm to 0.33mm positioned on a 1.2mm grid. Output Power and Thermal Limits The AMS3132 junction temperature and current capability depends on the internal dissipation and the junction to case thermal resistance of the TO-263 exposed tab packages. Additionally, the tab paddle and PCB temperature will be elevated due to the total losses of the LDO and of other circuits mounted to the PCB. Tjmax=Pd·θjc+Tpcb+Tamb The internal losses contribute to the junction temperature rise above the paddle and PCB temperature. |
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