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LM2642MTC Datasheet

  • LM2642MTC

  • Two-Phase Synchronous Step-Down Switching Controller

  • 21頁

  • NSC

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LM2642 Two-Phase Synchronous Step-Down Switching Controller
May 2003
LM2642
Two-Phase Synchronous Step-Down Switching
Controller
General Description
The LM2642 consists of two current mode synchronous
buck regulator controllers with a switching frequency of
300kHz.
The two switching regulator controllers operate 180藲 out of
phase. This feature reduces the input ripple RMS current,
thereby significantly reducing the required input capacitance.
The two switching regulator outputs can also be paralleled to
operate as a dual-phase single output regulator.
The output of each channel can be independently adjusted
from 1.3 to V
IN
鈥?/div>
maximum duty cycle. An internal 5V rail is
also available externally for driving bootstrap circuitry.
Current-mode feedback control assures excellent line and
load regulation and a wide loop bandwidth for excellent
response to fast load transients. Current is sensed across
either the Vds of the top FET or across an external current-
sense resistor connected in series with the drain of the top
FET. Current limit is independently adjustable for each chan-
nel.
The LM2642 features analog soft-start circuitry that is inde-
pendent of the output load and output capacitance. This
makes the soft-start behavior more predictable and control-
lable than traditional soft-start circuits.
A PGOOD1 pin is provided to monitor the dc output of
channel 1. Over-voltage protection is available for both out-
puts. A UV-Delay pin is also available to allow delayed shut
off time for the IC during an output under-voltage event.
Features
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Two synchronous buck regulators
180藲 out of phase operation
4.5V to 30V input range
Power good function monitors Ch.1
37碌A(chǔ) Shutdown current
0.04% (typical) line and load regulation error
Current mode control with or without a sense resistor
Independent enable/soft-start pins allow simple
sequential startup configuration.
Configurable for single output parallel operation. (See
Figure 2).
Adjustable cycle-by-cycle current limit
Input under-voltage lockout
Output over-voltage latch protection
Output under-voltage protection with delay
Thermal shutdown
Self discharge of output capacitors when the regulator is
OFF
TSSOP package
Applications
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Embedded computer systems
High end gaming systems
Set-top boxes
WebPAD
Block Diagram
20046201
漏 2003 National Semiconductor Corporation
DS200462
www.national.com

LM2642MTC 產(chǎn)品屬性

  • National Semiconductor (TI)

  • 4.5 V to 30 V

  • 1.3 V to 30 V

  • 20 A

  • 2

  • + 125 C

  • SMD/SMT

  • TSSOP-28

  • - 40 C

  • Tube

  • 48

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