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LM21215AMHE-1 Fiches technique(PDF) 1 Page - Texas Instruments |
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LM21215AMHE-1 Fiches technique(HTML) 1 Page - Texas Instruments |
1 / 38 page FB PGOOD VIN LM21215A-1 VOUT AGND COMP PVIN SYNC SW EN LF RC1 CC1 CC2 CC3 RFB1 RFB2 RC2 PGND AVIN CF 1 11Å16 3 4 19 18 20 8,9,10 5,6,7 RF SS/TRK CSS 2 CIN COUT 17 PGOOD optional optional 0 3 6 9 12 15 90 92 94 96 98 100 OUTPUT CURRENT (A) VIN = 3.3V VIN = 4.0V VIN = 5.0V VIN = 5.5V Product Folder Sample & Buy Technical Documents Tools & Software Support & Community LM21215A SNOSB87C – MARCH 2011 – REVISED JANUARY 2016 LM21215A 15-A Ultra High-Efficiency Synchronous Buck Converter With Frequency Synchronization 1 Features 3 Description The LM21215A is a synchronous buck DC-DC 1 • High-Efficiency Synchronous DC-DC Converter converter that delivers up to 15 A of output current at – Input Voltage Range of 2.95 V to 5.5 V output voltages as low as 0.6 V. Operating over an – Adjustable Output Voltage From 0.6 V to VIN input voltage range of 2.95 V to 5.5 V with ultra-high efficiency, the LM21215A suits a wide variety of low – Output Current as High as 15 A voltage systems. The voltage-mode control loop with • Frequency Synchronization 300 kHz to 1.5 MHz high gain-bandwidth error amplifier provides high • Integrated 7-m Ω PMOS Buck Switch Supports noise immunity, narrow duty cycle capability and is 100% Duty Cycle for Low Dropout Voltage easily compensated for stable operation with any type of output capacitor, providing maximum flexibility and • Integrated 4.3-m Ω NMOS Synchronous Rectifier ease of use. Eliminates Schottky Diode The LM21215A features internal overvoltage • Accurate ±1% Internal Voltage Reference protection (OVP) and cycle-by-cycle overcurrent • Automatic Diode Emulation Mode for Improved protection (OCP) for increased system reliability. A Efficiency at Light Loads precision enable pin and integrated UVLO allow turn- • Monotonic Pre-Biased Startup on of the device to be tightly controlled and • Internal 0.5-ms or Externally Adjustable Soft-Start sequenced. Startup inrush currents are limited by an internally-fixed or externally-adjustable soft-start • Output Voltage Tracking Capability circuit. An integrated open-drain PGOOD indicator • Ultra-Fast Line and Load Transient Response provides fault reporting and supply sequencing. – Voltage-Mode PWM Control Other features include auxiliary voltage rail tracking, – Wide-Bandwidth Voltage Loop Error Amplifier monotonic startup into pre-biased loads, and • Precision Enable with Hysteresis switching frequency synchronization to an external clock signal between 300 kHz and 1.5 MHz for beat- • Integrated OVP, UVP, OCP and UVLO frequency sensitive and multi-regulator applications. • Open-Drain Power Good Indicator The LM21215A is offered in a thermally-enhanced • Thermal Shutdown Protection With Hysteresis 20-pin HTSSOP package with an exposed pad that is soldered to the PCB to achieve a very low junction-to- • Thermally-Enhanced HTSSOP-20 Package board thermal impedance. 2 Applications Device Information(1) • Telecommunications Infrastructure PART NUMBER PACKAGE BODY SIZE (NOM) • DSP and FPGA Core Voltage Supplies LM21215A HTSSOP (20) 6.50 mm × 4.40 mm • High Efficiency POL Conversion (1) For all available packages, see the orderable addendum at • Embedded Computing, Servers and Storage the end of the data sheet. Typical Application Circuit Efficiency at 2.5 V, 500 kHz 1 An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA. |
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