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LM2831 Datasheet(PDF) 1 Page - Texas Instruments |
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LM2831 Datasheet(HTML) 1 Page - Texas Instruments |
1 / 38 page 100 90 80 70 60 50 0.1 1 LOAD (A) "X" GND FB EN VIN SW VIN = 5V C1 R3 D1 L1 R2 R1 C2 C3 VO = 3.3V @ 1.5A LM2831 Product Folder Sample & Buy Technical Documents Tools & Software Support & Community Reference Design LM2831 SNVS422D – AUGUST 2006 – REVISED SEPTEMBER 2015 LM2831 High-Frequency 1.5-A Load — Step-Down DC-DC Regulator 1 Features 3 Description The LM2831 regulator is a monolithic, high- 1 • Space-Saving SOT-23 Package frequency, PWM step-down DC-DC converter in a 5- • Input Voltage Range of 3 V to 5.5 V pin SOT-23 and a 6-Pin WSON package. The • Output Voltage Range of 0.6 V to 4.5 V LM2831 provides all the active functions to provide local DC-DC conversion with fast transient response • 1.5-A Output Current and accurate regulation in the smallest possible PCB • High Switching Frequencie area. With a minimum of external components, the – 1.6 MHz (LM2831X) LM2831 is easy to use. The ability to drive 1.5-A loads with an internal 130-m Ω PMOS switch using – 0.55 MHz (LM2831Y) state-of-the-art 0.5-µm BiCMOS technology results in – 3 MHz (LM2831Z) the best power density available. The world-class • 130-m Ω PMOS Switch control circuitry allows on-times as low as 30 ns, thus • 0.6-V, 2% Internal Voltage Reference supporting exceptionally high frequency conversion over the entire 3 V to 5.5 V input operating range, • Internal Soft Start down to the minimum output voltage of 0.6 V. • Current Mode, PWM Operation Switching frequency is internally set to 550 kHz, 1.6 • Thermal Shutdown MHz, or 3 MHz, allowing the use of extremely small surface mount inductors and chip capacitors. Even • Overvoltage Protection though the operating frequency is high, efficiencies of up to 93% are easy to achieve. External shutdown is 2 Applications included, featuring an ultra-low standby current of 30 • Local 5 V to Vcore Step-Down Converters nA. The LM2831 utilizes current-mode control and internal compensation to provide high-performance • Core Power in HDDs regulation over a wide range of operating conditions. • Set-Top Boxes Additional features include internal soft-start circuitry • USB Powered Devices to reduce inrush current, pulse-by-pulse current limit, • DSL Modems thermal shutdown, and output overvoltage protection. Device Information(1) PART NUMBER PACKAGE BODY SIZE (NOM) WSON (6) 3.00 mm × 3.00 mm LM2831 SOT-23 (5) 1.60 mm × 2.90 mm (1) For all available packages, see the orderable addendum at the end of the data sheet. Typical Application Circuit Efficiency vs Load 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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