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MIC61150YML Datasheet(PDF) 13 Page - Micrel Semiconductor |
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MIC61150YML Datasheet(HTML) 13 Page - Micrel Semiconductor |
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13 / 22 page  Micrel, Inc. MIC61150 November 2010 13 M9999-112210-A Adjustable Regulator Design The MIC61150 adjustable version allows programming the output voltage from 0.5V to 3.0V by placing a resistor divider network (R1, R2) from VOUT to GND (see Application Circuit). The high side of R1 should be connected at the point-of-load for high-accuracy Kelvin sensing. VOUT is determined by the following equation: ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + × = 1 R2 R1 0.5 VOUT Eq. 1 where VOUT is the desired output voltage. The resistor (R2) value between the FB pin and GND is selected to maintain a minimum 10mA load on the output. The resistor values are calculated from the previous equation, resulting in the following: ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ − × = 1 0.5 V R2 R1 OUT Eq. 2 Table 1 is a list of resistor combinations to set the output voltage. A 1% tolerance is recommended for both R1 and R2. For a unity gain, 0.5V output voltage, connect the FB pin directly to the output. VOUT R1 R2 0.5V − 49.9Ω 0.6V 10.0Ω 49.9Ω 0.7V 20.0Ω 49.9Ω 0.8V 30.1Ω 49.9Ω 0.9V 40.2Ω 49.9Ω 1.0 49.9Ω 49.9Ω 1.1V 60.4Ω 49.9Ω 1.2V 69.8Ω 49.9Ω 1.5V 100Ω 49.9Ω 1.8V 130Ω 49.9Ω 2.2V 169Ω 49.9Ω Table 1. Resistor Selection for Specific VOUT Thermal Design Linear regulators are simple to use. The most complicated design parameters to consider are thermal characteristics. To help reduce the thermal resistance, the ePad (underneath the IC) should be soldered to the PCB ground and the placement of thermal vias either underneath or near the ePad is highly recommended. Thermal design requires the following application- specific parameters: • Maximum ambient temperature (TA) • Output current (IOUT) • Output voltage (VOUT) • Input voltage (VIN) • Ground current (IGND) First, calculate the power dissipation of the regulator from these numbers and the device parameters from this datasheet: PD = (VIN - VOUT) × IOUT + (VIN × IGND) Eq. 3 where the ground current is approximated by using numbers from the Electrical Characteristics or Typical Characteristics sections For example, given an expected maximum ambient temperature (TA) of 75°C with VIN = 1.2V, VOUT = 0.9V, and IOUT = 1.5A, first calculate the expected PD using Equation 1: PD = (1.2V – 0.9V) × 1.5A + 1.2V × 0.015A = 0.468W Eq. 4 Next, determnine the junction temperature for the expected power dissipation above using the thermal resistance (θJA) of the 10-pin 3mm × 3mm MLF ® (YML) adhering to the following criteria for the PCB design: 1oz. copper and 100mm 2 copper area for the MIC61150. TJ = (θJA × PD) + TA = (60.7 °C/W × 0.468W) + 75°C = 103.4 °C Eq. 5 |
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