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LM21212-2 Datasheet(PDF) 1 Page - Texas Instruments |
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LM21212-2 Datasheet(HTML) 1 Page - Texas Instruments |
1 / 32 page FB PGOOD VIN LM21212-2 VOUT AGND COMP PVIN FADJ SW EN CIN COUT LOUT RC1 CC1 CC2 CC3 RFB1 RFB2 RC2 PGND AVIN CF 1 11-16 3 4 17 19 18 20 8,9,10 5,6,7 RF SS/ TRK CSS 2 optional HTSSOP-20 optional RADJ LM21212-2 www.ti.com SNVS715A – MARCH 2011 – REVISED MARCH 2013 12A High Efficiency Synchronous Buck Regulator with Adjustable Switching Frequency Check for Samples: LM21212-2 1 FEATURES DESCRIPTION The LM21212-2 is a monolithic synchronous buck 2 • Integrated 7.0 m Ω High Side and 4.3 mΩ Low regulator that is capable of delivering up to 12A of Side FET Switches continuous output current while producing an output • 300 kHz to 1.55 MHz Resistor-Adjustable voltage down to 0.6V with outstanding efficiency. The Frequency device is optimized to work over an input voltage range of 2.95V to 5.5V, making it suited for a wide • Adjustable Output Voltage from 0.6V to VIN variety of low voltage systems. The voltage mode (100% Duty Cycle Capable), ±1% Reference control loop provides high noise immunity, narrow • Input Voltage Range 2.95V to 5.5V duty cycle capability and can be compensated to be • Startup Into Pre-Biased Loads stable with any type of output capacitance, providing maximum flexibility and ease of use. • Output Voltage Tracking Capability • Wide Bandwidth Voltage Loop Error Amplifier The LM21212-2 features internal over voltage protection (OVP) and over-current protection (OCP) • Adjustable Soft-Start With External Capacitor for increased system reliability. A precision enable pin • Precision Enable Pin With Hysteresis and integrated UVLO allow turn-on of the device to • Integrated OVP, OCP, OTP, UVLO and Power- be tightly controlled and sequenced. Startup inrush Good currents are limited by both an internally fixed and externally adjustable soft-start circuit. Fault detection • Thermally Enhanced HTSSOP-20 Exposed Pad and supply sequencing are possible with the Package integrated power good circuit. APPLICATIONS The LM21212-2 is designed to work well in multi-rail power supply architectures. The output voltage of the • Broadband, Networking and Wireless device can be configured to track an external voltage Communications rail using the SS/TRK pin. The switching frequency • High-Performance FPGAs, ASICs and can be programmed between 300 kHz and 1.55 MHz Microprocessors with an external resistor. • Simple to Design, High Efficiency Point of If the output is pre-biased at startup, it will not sink Load Regulation from a 5V or 3.3V Bus current, allowing the output to smoothly rise past the pre-biased voltage. The regulator is offered in a 20- pin HTSSOP package with an exposed pad that can be soldered to the PCB, eliminating the need for bulky heatsinks. SIMPLIFIED APPLICATION CIRCUIT 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 2 All trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Copyright © 2011–2013, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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