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MIC2182-5.0YM Datasheet(PDF) 3 Page - Micrel Semiconductor |
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MIC2182-5.0YM Datasheet(HTML) 3 Page - Micrel Semiconductor |
3 / 28 page April 22, 2004 3 M9999-042204 MIC2182 Micrel Pin Description Pin Number Pin Name Pin Function 1 SS Soft-Start (External Component): Connect external capacitor to ground to reduce inrush current by delaying and slowing the output voltage rise time. Rise time is controlled by an internal 5 µA current source that charges an external capacitor to V DD. 2 PWM PWM/Skip-Mode Select (Input): Low sets PWM-mode operation. 1nF capacitor to ground sets automatic PWM/skip-mode selection. 3 COMP Compensation (Output): Internal error amplifier output. Connect to capacitor or series RC network to compensate the regulator control loop. 4 SGND Small Signal Ground (Return): Route separately from other ground traces to the (–) terminal of C OUT. 5 SYNC Frequency Synchronization (Input): Optional. Connect to external clock signal to synchronize the oscillator. Leading edge of signal above the threshold terminates the switching cycle. Connect to SGND if unused. 6 EN/UVLO Enable/Undervoltage Lockout (Input): Low-level signal powers down the controller. Input below the 2.5V threshold disables switching and functions as an accurate undervoltage lockout (UVLO). Input below the threshold forces complete micropower (< 0.1 µA) shutdown. 7 (fixed) VREF Reference Voltage (Output): 1.245V output. Requires 0.1 µf capacitor to ground. 7 (adj) FB Feedback (Input): Regulates FB pin to 1.245V. See “Application Information” for resistor divider calculations. 8 CSH Current-Sense High (Input): Current-limit comparator noninverting input. A built-in offset of 100mV between CSH and V OUT pins in conjunction with the current-sense resistor set the current-limit threshold level. This is also the positive input to the current sense amplifier. 9 VOUT Current-Sense Low (Input): Output voltage feedback input and inverting input for the current limit comparator and the current sense amplifier. 10 VIN [Battery] Unregulated Input (Input): +4.5V to +32V supply input. 11 VDD 5V Internal Linear-Regulator (Output): V DD is the external MOSFET gate drive supply voltage and an internal supply bus for the IC. Bypass to SGND with 4.7 µF. V DD can supply up to 5mA for external loads. 12 PGND MOSFET Driver Power Ground (Return): Connects to source of synchro- nous MOSFET and the (–) terminal of C IN 13 LSD Low-Side Drive (Output): High-current driver output for external synchronous MOSFET. Voltage swing is between ground and V DD. 14 BST Boost (Input): Provides drive voltage for the high-side MOSFET driver. The drive voltage is higher than the input voltage by V DD minus a diode drop. 15 VSW Switch (Return): High-side MOSFET driver return. 16 HSD High-Side Drive (Output): High-current driver output for high-side MOSFET. This node voltage swing is between ground and V IN + 5V – Vdiode drop. |
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