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MIC2873 Datasheet(PDF) 11 Page - Micrel Semiconductor |
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MIC2873 Datasheet(HTML) 11 Page - Micrel Semiconductor |
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11 / 24 page  Micrel, Inc. MIC2873 Functional Description VIN The input supply provides power to the internal MOSFETs gate drive and controls circuitry for the switch-mode regulator. The operating input voltage range is from 2.7V to 5.5V. A 4.7µF low-ESR ceramic input capacitor should be connected from VIN to AGND as close to MIC2873 as possible to ensure a clean supply voltage for the device. The minimum voltage rating of 10V is recommended for the input capacitor. SW The MIC2873 has internal low-side and synchronous MOSFET switches. The switch node (SW) between the internal MOSFET switches connects directly to one end of the inductor and provides the current paths during switching cycles. The other end of the inductor is connected to the input supply voltage. Due to the high-speed switching on this pin, the switch node should be routed away from sensitive nodes wherever possible. LGND This is the ground path of the LED current sink. It should be connected to the AGND on the PCB. The current loop of the analog ground should be separated from that of the power ground (PGND). LGND and AGND should be connected to PGND at a single point. AGND This is the ground path for the internal biasing and control circuitry. AGND should be connected to the LGND directly. The current loop of the analog ground should be separated from that of the power ground (PGND). The AGND and LGND should be connected to PGND at a single point. PGND The power ground pin is the ground path for the high current in the boost switch. The current loop for the power ground should be as small as possible and separate from the analog ground (AGND) loop as applicable. OUT Boost converter output pin which is connected to the anode of the LED. A low-ESR ceramic capacitor of 4.7µF or larger should be connected from OUT to PGND as close as possible to the MIC2873. The minimum voltage rating of 10V is recommended for the output capacitor. LED The current sink pin for the LED. The LED anode is connected to the OUT pin and the LED cathode is connected to this pin. DC The DC is a single multiplexed device enable and serial data control pin used for functional control and communication in GPIO limited applications. When the DC pin is used as a hardware device enable pin, a logic high signal on the DC pin enables the device, and a logic low signal on the DC pin disables the device. When the DC pin is used as the single-wire serial interface digital control pin, a combination of bit edges and the period between edges is used to communicate a variable length data word across the single wire. Each word is transmitted as a series of pulses, with each pulse incrementing an internal data counter. A stop sequence consisting of an inactive period is used to latch the data word internally. Two data words in series received are then used to set a specific register with specific value for controlling specific function. The MIC2873 supports five writeable registers for controlling flash mode, torch mode, safety timer duration, safety timer threshold current, and low-battery threshold. An address/data frame is used to improve protection against erroneous writes where communications are in error. When DC is in a low state and no data is detected for longer than 405µs, the MIC2873 will automatically go into a low-power SHUTDOWN state, simultaneously resetting all internal registers to their default states. FEN FEN is the hardware enable pin for flash mode. A logic low-to-high transition on FEN pin can initiate the MIC2873 in flash mode. If FEN is left floating, it is pulled down internally by a built-in 1µA current source when the device is enabled. Flash mode is terminated when FEN is pulled low or left floating, and the flash register is cleared. July 17, 2014 11 Revision 1.0 |
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