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LM3281 Folha de dados(PDF) 1 Page - Texas Instruments |
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LM3281 Folha de dados(HTML) 1 Page - Texas Instruments |
1 / 26 page FB EN VIN SW VIN 3 V - 5.5 V CIN 2.2 µF COUT 2.2 µF GND LSW 0.47 µH LM3281 VOUT 3.3 V GPO1 MODE VIN_c VIN_b VIN_a CLOAD2 4.7 µF CLOAD1 10 µF GPO2 Product Folder Sample & Buy Technical Documents Tools & Software Support & Community LM3281 SNVSA38 – NOVEMBER 2014 LM3281 3.3-V, 1.2-A, 6-MHz Miniature Step-Down DC-DC Converter for Wireless Connectivity Solutions 1 Features 3 Description The LM3281 is a high-efficiency low-noise miniature 1 • Operates from a Single Li-Ion Cell (3 V to 5.5 V) DC-DC converter optimized for powering noise- • 6-MHz (typ.) PWM Switching Frequency sensitive wireless connectivity chipsets and RF Front • Fixed Output Voltage: 3.3 V End Modules (FEMs) from a single Lithium-Ion cell. The LM3281 is ideal for “always on” applications with • Up to 1.2-A Maximum Load Capability very low unloaded quiescent current of 16 µA (typ.). • High Efficiency: 94% (typ.) with 3.8-V VIN at 300 mA The LM3281 steps down an input supply voltage to a fixed output voltage of 3.3 V with output current up to • Analog Bypass: 60-mV (typ.) Drop-Out at 600 mA 1200 mA. Five different modes of operation are used • Low IQ: 16 µA typical, 25 µA maximum to optimize efficiency and minimize battery drain. In • Automatic ECO/PWM/Bypass Mode Change Pulse Width Modulation (PWM) mode, the device operates at a fixed frequency of 6 MHz which • Forced PWM Mode for Low Output-Voltage Ripple minimizes RF interference when driving medium-to- • Soft-Start Limits Input Current on Start-Up heavy loads. At light load, the device automatically • Current Overload Protection enters into Economy (ECO) mode with reduced quiescent current. In a low-battery voltage condition, • Thermal Overload Protection a bypass mode reduces the voltage dropout to 60 mV • Small Total Solution Size: < 7.5 mm2 (typ.) at 600 mA. If very low output voltage ripple is desired at light loads, the device can also be forced 2 Applications into PWM mode. Shutdown mode turns the device off • WLAN, WiFi Station Devices and reduces battery consumption to 0.1 μA (typ.). • WiFi RF PC Cards Device Information(1) • Battery-Powered RF Devices PART NUMBER PACKAGE BODY SIZE LM3281 DSBGA (6) 1.465 mm x 1.190 (MAX) (1) For all available packages, see the orderable addendum at the end of the datasheet. Simplified Schematic 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. |
Nº de peça semelhante - LM3281_15 |
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Descrição semelhante - LM3281_15 |
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