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MIC2184BQS Datasheet(PDF) 3 Page - Micrel Semiconductor |
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MIC2184BQS Datasheet(HTML) 3 Page - Micrel Semiconductor |
3 / 12 page April 2005 3 M9999-042205 MIC2184 Micrel, Inc. Pin Description Pin Number Pin Name Pin Function 1 VINA Analog voltage input voltage to the circuit. This powers up the analog sections of the die and does not need to be the same voltage as Pin 16 (V INP). 2 FreqOut This provides a digital signal output signal at half the switching frequency. This signal swings from 0 to 3V, and can be used to drive an external capacitive doubler to provide a higher voltage to the V INP input. 3SS Soft start reduces the inrush current and delays and slows the output voltage rise time. A 5µA current source will charge the capacitor up to VDD. A 1µF capacitor will soft start the switching regulator in 1.5ms. 4 COMP Compensation (Output): Internal error amplifier output. Connect to a capacitor or series RC network to compensate the regulator’s control loop. 5 SGND Small signal ground: must be routed separately from other grounds to the (-) terminal of C OUT. 6FB Feedback Input - the circuit regulates this pin to 1.245V. 7 EN/UVLO Enable/UnderVoltage Lockout (input): A low level on this pin will power down the device, reducing the quiescent current to under 5uA. This pin has two separate thresholds, below 1.5V the output switching is disabled, and below 0.9V the part is forced into a complete micropower shutdown. The 1.5V threshold functions as an accurate undervoltage lockout (UVLO) with 140mV hysteresis. 8 CSL The (-) input to the current limit comparator. A built in offset of 100mV between CSH and CSL in conjunction with the current sense resistor sets the current limit threshold level. This is also the (-) input to the current amplifier. 9 CSH The (+) input to the current limit comparator. A built in offset of 100mV between CSH and CSL in conjunction with the current sense resistor sets the current limit threshold level. This is also the (+) input to the current amplifier. 10 VDD 3V internal linear-regulator output. V DD is also the supply voltage bus for the chip. Bypass to SGND with 1µF. 11 SYNC Frequency Synchronization (Input): Connect an external clock signal to synchronize the oscillator. Leading edge of signal above 1.5V starts the switching cycle. Connect to SGND if not used. 12 PGND MOSFET driver power ground, connects to source of synchronous MOSFET and the (-) terminal of CIN. 13 VREF The 1.245V voltage reference is available on this pin. A 0.1µF capacitor should be connected from this pin to ground. 14 OUTP High current drive for high side P channel MOSFET. Voltage swing is from ground to V INP. On-resistance is typically 2.5Ω. 15 FREQ/2 When this is low, the oscillator frequency is 400KHz. When this pin is raised to V DD, the oscillator frequency is 200KHz. 16 VINP Power Input voltage to the circuit. The output gate drivers are powered from this supply. The current sense resistor R CS should be connected as close as possible to this pin. |
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