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MIC2208BML Datasheet(PDF) 8 Page - Micrel Semiconductor |
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MIC2208BML Datasheet(HTML) 8 Page - Micrel Semiconductor |
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8 / 19 page  Micrel, Inc. MIC2208 Pin Description VIN Two pins for VIN provide power to the source of the internal P-channel MOSFET along with the current limiting sensing. The VIN operating voltage range is from 2.7V to 5.5V. Due to the high switching speeds, a 10 µF capacitor is recommended close to VIN and the power ground (PGND) for each pin for bypassing. Please refer to layout recommendations. BIAS The bias (BIAS) provides power to the internal reference and control sections of the MIC2208. A 10 Ohm resistor from VIN to BIAS and a 0.1uF from BIAS to SGND is required for clean operation. EN The enable pin provides a logic level control of the output. In the off state, supply current of the device is greatly reduced (typically <1 µA). Do not drive the enable pin above the supply voltage. FB The feedback pin (FB) provides the control path to control the output. For adjustable versions, a resistor divider connecting the feedback to the output is used to adjust the desired output voltage. The output voltage is calculated as follows: ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + × = 1 R2 R1 V V REF OUT where VREF is equal to 1.0V. COMP The COMP pin is the output of the internal error amplifier. This pin is used to compensate the MIC2208 for stability over a varying range of external components. Refer to the compensation section of the datasheet for determining nessasary component values. SW The switch (SW) pin connects directly to the inductor and provides the switching current nessasary to operate in PWM mode. Due to the high speed switching on this pin, the switch node should be routed away from sensitive nodes. This pin also connects to the cathode of the free-wheeling diode. PGOOD Power good is an open drain pull down that indicates when the output voltage has reached regulation. For a power good low, the output voltage is within +/- 10% of the set regulation voltage. For output voltages greater or less than 10%, the PGOOD pin is high. This should be connected to the input supply through a pull up resistor. A delay can be added by placing a capacitor from PGOOD to ground. PGND Power ground (PGND) is the ground path for the MOSFET drive current. The current loop for the power ground should be as small as possible and separate from the Analog ground (AGND) loop. Refer to the layout considerations fro more details. SGND Signal ground (SGND) is the ground path for the biasing and control circuitry. The current loop for the signal ground should be separate from the power ground (PGND) loop. Refer to the layout considerations for more details. September 2005 8 M9999-092905 www.micrel.com |
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