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LM2748MTC View Datasheet(PDF) - National ->Texas Instruments

Part NameLM2748MTC National-Semiconductor
National ->Texas Instruments National-Semiconductor
DescriptionSynchronous Buck Controller with Pre-bias Startup, and Optional Clock Synchronization
LM2748MTC Datasheet PDF : 23 Pages
1 2 3 4 5 6 7 8 9 10 Next Last
Typical Performance Characteristics (Continued)
Start-Up (No-Load)
VCC = 3.3V, VIN = 5V, VOUT = 1.2V
CSS = 12 nF, fSW = 1 MHz
Shutdown (Full-Load)
VCC = 3.3V, VIN = 5V, VOUT = 1.2V
IOUT = 3A, CSS = 12 nF, fSW = 1 MHz
20137449
Load Transient Response
VCC = 3.3V, VIN = 14V, VOUT = 1.2V
fSW = 1 MHz
20137450
Line Transient Response (VIN = 3V to 9V)
VCC = 3.3V, VOUT = 1.2V
IOUT = 2A, fSW = 1 MHz
20137453
Frequency vs. Frequency Adjust Resistor
20137454
Maximum Duty Cycle vs Frequency
VCC = 3.3V
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20137455
6
20137492
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DESCRIPTION
The LM2745/8 are high-speed synchronous buck regulator controllers with an accurate feedback voltage accuracy of ±1.5%. It can provide simple down conversion to output voltages as low as 0.6V. Though the control sections of the IC are rated for 3 to 6V, the driver sections are designed to accept input supply rails as high as 14V. The use of adaptive non-overlapping MOSFET gate drivers helps avoid potential shoot-through problems while maintaining high efficiency. The IC is designed for the more cost effective option of driving only N-channel MOSFETs in both the high-side and low-side positions. It senses the low-side switch voltage drop for providing a simple, adjustable current limit.
The LM2745/8 features a fixed-frequency voltage-mode PWM control architecture which is adjustable from 50 kHz to 1 MHz with one external resistor. In addition, the LM2745 also allows the switching frequency to be synchronized to an external clock signal over the range of 250 kHz to 1 MHz. This wide range of switching frequency gives the power supply designer the flexibility to make better tradeoffs between component size, cost and efficiency.

FEATURES
• Switching Frequency from 50 kHz to 1 MHz
• Switching Frequency Synchronize Range 250 kHz to 1 MHz (LM2745 Only)
• Startup with a Pre-biased Output Load
• Power Stage Input Voltage from 1V to 14V
• Control Stage Input Voltage from 3V to 6V
• Output Voltage Adjustable Down to 0.6V
• Power Good Flag and Shutdown
• Output Overvoltage and Undervoltage Detection
• ±1.5% Feedback Voltage Accuracy Over Temperature
• Low-side Adjustable Current Sensing
• Adjustable Soft-start
• Tracking and Sequencing with Shutdown and Soft Start Pins
• TSSOP-14 Package

APPLICATIONS
• Down Conversion from 3.3V
• Cable Modem, DSL and ADSL
• Laser Jet and Ink Jet Printers
• Low Voltage Power Modules
• DSP, ASIC, Core and I/O

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