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Details, datasheet, quote on part number: LM26420
 
 
Part numberLM26420
CategoryPower Management => Regulators => Switching Regulators
DescriptionHigh Frequency 2.0A Load - Step-Down DC-DC Regulator
The LM26420 regulator is a monolithic, high frequency, dual PWM step-down DC/DC converter in a 16 Pin LLP and a 20 Pin eTSSOP package. It provides all the active functions to provide local DC/DC conversion with fast transient response and accurate regulation in the smallest possible PCB area. With a minimum of external components, the LM26420 is easy to use. The ability to drive two 2.0A loads with an internal 75 m? PMOS top switch and an internal 50 m? NMOS bottom switch using state-of-the-art 0.5 µm BiCMOS technology results in the best power density available. The world-class control circuitry allows on-times as low as 30ns, thus supporting exceptionally high frequency conversion over the entire 3V to 5.5V input operating range down to the minimum output voltage of 0.8V. Switching frequency is internally set to 550 kHz or 2.2 MHz, allowing the use of extremely small surface mount inductors and chip capacitors. Even though the operating frequency is high, efficiencies up to 93% are easy to achieve. External shutdown is included, featuring an ultra-low stand-by current. The LM26420 utilizes current-mode control and internal compensation to provide high-performance regulation over a wide range of operating conditions. Additional features include internal soft-start circuitry to reduce inrush current, pulse-by-pulse current limit, thermal shutdown, power good indicators, precision enables, and output over-voltage protection.
CompanyNational Semiconductor Corporation
DatasheetDownload LM26420 datasheet
Request For QuoteFind where to buy LM26420
 


 
Specifications, Features, Applications
LM26420 Dual 2.0A, High Frequency Step-Down DC-DC Regulator
LM26420 Dual 2.0A, High Frequency Synchronous Step-Down DCDC Regulator

The LM26420 regulator is a monolithic, high frequency, dual PWM step-down DC/DC converter a 16 Pin LLP and a 20 Pin eTSSOP package. It provides all the active functions to provide local DC/DC conversion with fast transient response and accurate regulation in the smallest possible PCB area. With a minimum of external components, the LM26420 is easy to use. The ability to drive two 2.0A loads with an internal 75 m PMOS top switch and an internal 50 m NMOS bottom switch using state-of-the-art 0.5 µm BiCMOS technology results in the best power density available. The world-class control circuitry allows on-times as low as 30ns, thus supporting exceptionally high frequency conversion over the entire to 5.5V input operating range down to the minimum output voltage of 0.8V. Switching frequency is internally set to 550 kHz or 2.2 MHz, allowing the use of extremely small surface mount inductors and chip capacitors. Even though the operating frequency is high, efficiencies to 93% are easy to achieve. External shutdown is included, featuring an ultralow stand-by current. The LM26420 utilizes current-mode control and internal compensation to provide high-performance regulation over a wide range of operating conditions. Additional features include internal soft-start circuitry to reduce inrush current, pulse-by-pulse current limit, thermal shutdown, power good indicators, precision enables, and output over-voltage protection.

Features

Input voltage range to 5.5V Output voltage range 4.5V 2.0A output current per output High Switching Frequencies (LM26420Y) 75m PMOS switch 50m NMOS switch 0.8V, 1.5% Internal Voltage Reference Internal soft-start Independent power good for each output Independent precision enable for each output Current mode, PWM operation Thermal Shutdown Over voltage protection Start-up into Pre-biased Output Loads Outputs are 180° out of phase

Applications

Local 5V to Vcore Step-Down Converters Core Power in HDDs Set-Top Boxes USB Powered Devices DSL Modems Powering Core and I/O voltages for FPGAs, CPLDs, and ASICs

Supplied As 1000 units Tape and Reel 3500 units Tape and Reel 1000 units Tape and Reel 4500 units Tape and Reel 1000 units Tape and Reel 3500 units Tape and Reel 1000 units Tape and Reel 4500 units Tape and Reel

Pin DAP Name VIND1 VIND2 VINC PGND1 PGND2 AGND EN1 EN2 Die Attach Pad Function Power Input supply for Buck 1. Power Input supply for Buck 2. Input supply for control circuitry. Power ground pin for Buck 1. Power ground pin for Buck 2. Signal ground pin. Place the bottom resistor of the feedback network as close as possible to pin. Power Good Indicator for Buck 1. Pin is connected through a resistor to an external supply (open drain output). Power Good Indicator for Buck 2. Pin is connected through a resistor to an external supply (open drain output). Feedback pin for Buck 1. Connect to external resistor divider to set output voltage. Feedback pin for Buck 2. Connect to external resistor divider to set output voltage. Output switch for Buck 1. Connect to the inductor. Output switch for Buck 2. Connect to the inductor. Enable control input. Logic high enable operation for Buck 1. Do not allow this pin to float or be greater than VIN + 0.3V. Enable control input. Logic high enable operation for Buck 2. Do not allow this pin to float or be greater than VIN + 0.3V. Connect to system ground for low thermal impedance, but it cannot be used as a primary GND connection.

Pin DAP Name VIND1 VIND2 VINC PGND1 PGND2 AGND EN1 EN2 Die Attach Pad Function Power Input supply for Buck 1. Power Input supply for Buck 2. Input supply for control circuitry. Power ground pin for Buck 1. Power ground pin for Buck 2. Signal ground pin. Place the bottom resistor of the feedback network as close as possible to pin. Power Good Indicator for Buck 1. Pin is connected through a resistor to an external supply (open drain output). Power Good Indicator for Buck 2. Pin is connected through a resistor to an external supply (open drain output). Feedback pin for Buck 1. Connect to external resistor divider to set output voltage. Feedback pin for Buck 2. Connect to external resistor divider to set output voltage. Output switch for Buck 1. Connect to the inductor. Output switch for Buck 2. Connect to the inductor. Enable control input. Logic high enable operation for Buck 1. Do not allow this pin to float or be greater than VIN + 0.3V. Enable control input. Logic high enable operation for Buck 2. Do not allow this pin to float or be greater than VIN + 0.3V. Connect to system ground for low thermal impedance and as a primary electrical GND connection.




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