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MIC2155 Datasheet(PDF) 5 Page - Micrel Semiconductor |
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MIC2155 Datasheet(HTML) 5 Page - Micrel Semiconductor |
5 / 33 page Micrel, Inc. MIC2155/2156 May 2009 5 M9999-052709-A (408) 944-0800 Pin Number Pin Name Pin Function 16 PGOOD Power Good (Output): Asserts high when voltage on the FB pin rises above Power Good threshold. 17 EA2+ (input) Positive input to Channel 2 (current sharing) error amplifier. Connect to Channel 1 current sense. 18 FB2 (input) Negatve input to Channel 2 (current sharing) error amplifier. Connect to Channel 2 current sense. 19 COMP2 Compensation 2 (Input): Pin for external compensation of Channel 2. 20 VOUT Output sense (input): Connect to output side of inductors. Used for current sharing. 21 VIN2 (Input) Supply voltage for Channel 2. Used for Channel 2 UVLO circuit. 22 N/C No Connect 23 SW2 Switch node 2 (Output): Return for HSD2. 24 HSD2 High-Side Drive 2 (Output): High current output-driver for the high-side MOSFET. 25 BST2 Boost 2 (Input): Provides voltage for high-side MOSFET driver in Channel 2. The gate drive voltage is higher than the source voltage by VDD minus a diode drop. 26 PGND2 Power Ground 2. High current return for low side driver 2. 27 LSD2 Low-Side Drive 2 (Output): High-current driver output for Channel 2 low-side external MOSFET. 28 VDD 5V Internal Linear Regulator from VIN1 (Output): VDD is the ext. MOSFET gate drive supply voltage and an internal supply bus for the IC. When VIN1 is <5V, this regulator operates in drop-out mode. Connect external bypass capacitor. 29 EN1 Enable 1 (Input): Output enable. Turns off both sides. Pull high to enable. Pull low to disable. 30 VIN1 Supply voltage Channel 1 (Input): Used for UVLO and VDD circuits. 31 LSD1 Low-Side Drive 1 (Output): High-current driver output for Channel 1 low-side external MOSFET. 32 PGND1 Power Ground 1. High current return for low side driver 1. EPAD EP Exposed Pad (Power) : Must make a full connection to the GND plane to maximize thermal performance of the package. |
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