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LMZ22005 Datasheet(PDF) 3 Page - Texas Instruments |
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LMZ22005 Datasheet(HTML) 3 Page - Texas Instruments |
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3 / 34 page  PGND/EP Connect to AGND 5 FB 6 SS/TRK 3 EN 1 VIN 2 SYNC 4 AGND 7 VOUT LMZ22005 www.ti.com SNVS686J – MARCH 2011 – REVISED AUGUST 2015 5 Pin Configuration and Functions NDW Package 7-Pin Top View Pin Functions PIN TYPE DESCRIPTION NAME NO. AGND 4 Ground Analog Ground — Reference point for all stated voltages. Must be externally connected to EP/PGND. EN 3 Analog Enable — Input to the precision enable comparator. Rising threshold is 1.279 V typical. Once the module is enabled, a 20-µA source current is internally activated to accommodate programmable hysteresis. FB 5 Analog Feedback — Internally connected to the regulation, overvoltage, and short circuit comparators. The regulation reference point is 0.796 V at this input pin. Connect the feedback resistor divider between the output and AGND to set the output voltage. PGND — Ground Exposed Pad / Power Ground Electrical path for the power circuits within the module. — NOT Internally connected to AGND / pin 4. Used to dissipate heat from the package during operation. Must be electrically connected to pin 4 external to the package. SS/TRK 6 Analog Soft-Start/Track — To extend the 1.6-ms internal soft-start connect an external soft -start capacitor. For tracking connect to an external resistive divider connected to a higher priority supply rail. See Design Steps. SYNC 2 Analog Sync Input — Apply a CMOS logic level square wave whose frequency is between 650 kHz and 950 kHz to synchronize the PWM operating frequency to an external frequency source. When not using synchronization connect to ground. The module free running PWM frequency is 812 kHz (typical) VIN 1 Power Supply input — Nominal operating range is 6 V to 20 V. A small amount of internal capacitance is contained within the package assembly. Additional external input capacitance is required between this pin and exposed pad (PGND). VOUT 7 Power Output Voltage — Output from the internal inductor. Connect the output capacitor between this pin and exposed pad. Copyright © 2011–2015, Texas Instruments Incorporated Submit Documentation Feedback 3 Product Folder Links: LMZ22005 |
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