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LT3028 Datasheet(PDF) 1 Page - Linear Technology |
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LT3028 Datasheet(HTML) 1 Page - Linear Technology |
1 / 20 page LT3029 1 3029fa TYPICAL APPLICATION FEATURES APPLICATIONS DESCRIPTION Dual 500mA/500mA Low Dropout, Low Noise, Micropower Linear Regulator The LT®3029 is a dual, micropower, low noise, low drop- out linear regulator. The device operates either with a common input supply or independent input supplies for each channel, over an input voltage range of 1.8V to 20V. Each output supplies up to 500mA of output current with a typical dropout voltage of 300mV. Quiescent current is well controlled in dropout. With an external 10nF bypass capacitor, output noise is only 20μVRMS over a 10Hz to 100kHz bandwidth. Designed for use in battery-powered systems, the low 55μA quiescent current per channel makes it an ideal choice. In shutdown, quiescent current drops to less than 1μA. Shutdown control is independent for each channel, allowing for flexible power management. The LT3029 optimizes stability and transient response with low ESR ceramic output capacitors, requiring a minimum of only 3.3μF. The regulator does not require the addition of ESR, as is common with other regulators. Internal circuitry provides reverse-battery protection, reverse-current protection, current limiting with foldback and thermal shutdown. The device is available as an adjustable output voltage device with a 1.215V reference voltage. The LT3029 is offered in the thermally enhanced 16-lead MSOP and 16-lead, low profile (4mm × 3mm × 0.75mm) DFN packages. 2.5VIN to 1.5V/1.8V Application n Output Current: 500mA per Channel n Low Dropout Voltage: 300mV n Low Noise: 20μVRMS (10Hz to 100kHz) n Low Quiescent Current: 55μA per Channel n Wide Input Voltage Range: 1.8V to 20V (Common or Independent Input Supply) n Adjustable Output: 1.215V Reference Voltage n Very Low Quiescent Current in Shutdown: <1μA per Channel n Stable with 3.3μF Minimum Output Capacitor n Stable with Ceramic, Tantalum or Aluminum Electrolytic Capacitors n Reverse-Battery and Reverse Output-to-Input Protection n Current Limit with Foldback and Thermal Shutdown n Tracking/Sequencing Capability: Compatible with LTC292X Power Supply Tracking ICs n Thermally Enhanced 16-Lead MSOP and 16-Lead (4mm × 3mm) DFN Packages n General Purpose Linear Regulator n Battery-Powered Systems n Microprocessor Core/Logic Supplies n Post Regulator for Switching Supplies n Tracking/Sequencing Power Supplies Dropout Voltage vs Load Current VOUT1 1.8V 500mA VOUT2 1.5V 500mA 237k 1% 10nF 3.3μF 113k 1% 3029 TA01 OUT2 ADJ2 BYP2 GND 237k 1% 10nF 3.3μF 54.9k 1% OUT1 ADJ1 BYP1 LT3029 IN1 VIN 2.5V 3.3μF SHDN1 IN2 SHDN2 OUTPUT CURRENT (mA) 0 400 350 300 250 200 150 100 50 0 400 3029 TA01b 100 200 300 500 50 450 150 250 350 TJ = 25°C L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. |
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