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MIC23153-GYMT Datasheet(PDF) 10 Page - Micrel Semiconductor |
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MIC23153-GYMT Datasheet(HTML) 10 Page - Micrel Semiconductor |
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10 / 18 page  Micrel Inc. MIC23153 December 2009 10 M9999-121409-A Functional Description VIN The input supply (VIN) provides power to the internal MOSFETs for the switch mode regulator along with the internal control circuitry. The VIN operating range is 2.7V to 5.5V so an input capacitor, with a minimum voltage rating of 6.3V, is recommended. Due to the high switching speed, a minimum 2.2µF bypass capacitor placed close to VIN and the power ground (PGND) pin is required. Refer to the layout recommendations for details. EN A logic high signal on the enable pin activates the output voltage of the device. A logic low signal on the enable pin deactivates the output and reduces supply current to 0.01µA. MIC23153 features external soft-start circuitry via the soft start (SS) pin that reduces in-rush current and prevents the output voltage from overshooting at start up. Do not leave the EN pin floating. SW The switch (SW) connects directly to one end of the inductor and provides the current path during switching cycles. The other end of the inductor is connected to the load, SNS pin and output capacitor. Due to the high speed switching on this pin, the switch node should be routed away from sensitive nodes whenever possible. SNS The sense (SNS) pin is connected to the output of the device to provide feedback to the control circuitry. The SNS connection should be placed close to the output capacitor. Refer to the layout recommendations for more details. AGND The analog ground (AGND) 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 recommendations for more details. PGND The power ground pin is the ground path for the high current in PWM mode. The current loop for the power ground should be as small as possible and separate from the analog ground (AGND) loop as applicable. Refer to the layout recommendations for more details. PG The power good (PG) pin is an open drain output which indicates logic high when the output voltage is typically above 92% of its steady state voltage. A pull-up resistor of more than 5kOhms should be connected from PG to VOUT. SS The soft start (SS) pin is used to control the output voltage ramp up time. The approximate equation for the ramp time in milliseconds is 270x10 3 x ln(10) x C SS. For example, for a CSS = 470pF, Trise ~ 300µs. See the Typical Characteristics curve for a graphical guide. The minimum recommended value for CSS is 100pF. FB The feedback (FB) pin is provided for the adjustable voltage option (no internal connection for fixed options). This is the control input for programming the output voltage. A resistor divider network is connected to this pin from the output and is compared to the internal 0.62V reference within the regulation loop. The output voltage can be programmed between 0.65V and 3.6V using the following equation: ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + ⋅ = R2 R1 1 V V REF OUT Where: R1 is the top resistor, R2 is the bottom resistor. Example feedback resistor values: VOUT R1 R2 1.2V 274k 294k 1.5V 316k 221k 1.8V 301k 158k 2.5V 324k 107k 3.3V 309k 71.5k |
Similar Part No. - MIC23153-GYMT |
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Similar Description - MIC23153-GYMT |
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