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LM21305 Datasheet(PDF) 2 Page - Texas Instruments |
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LM21305 Datasheet(HTML) 2 Page - Texas Instruments |
2 / 33 page PAD 2 6 3 4 5 1 7 16 15 17 18 19 20 21 PVIN SW SW SW SW PVIN PGND FREQ EN AGND AGND AGND AGND 2V5 LM21305 SNVS639F – DECEMBER 2009 – REVISED MARCH 2013 www.ti.com DESCRIPTION (CONTINUED) The LM21305 offers flexible system configuration with programmable switching frequency from 300 kHz to 1.5 MHz using one resistor or via external clock synchronization. On-chip bias supply sub-regulators alleviate the need for external bias power and simplify PCB layout. The device also offers internal soft-start to limit inrush current, pre-biased and monotonic startup capability, cycle-by-cycle current limiting, and thermal shutdown. Peak current-mode control with a high-gain error amplifier maintains stability throughout the entire input voltage and load current ranges and enables excellent line and load transient response. Offered in a thermally enhanced WQFN-28 package, the LM21305 features internal output over-voltage and over-current protection circuits for increased system reliability. A precision enable pin and integrated input UVLO allow the turn-on of the device to be tightly controlled and sequenced. An integrated open-drain power good indicator provides power rail sequencing capability and fault indication. Connection Diagram Figure 1. WQFN-28 Package, Exposed Pad Package Number RSG 2 Submit Documentation Feedback Copyright © 2009–2013, Texas Instruments Incorporated Product Folder Links: LM21305 |
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