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LM2648 Datasheet

  • LM2648

  • Two-Phase, Synchronous Step-Down 3-Channel Switching Regulat...

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LM2648 Two-Phase, Synchronous Step-Down 3-Channel Switching Regulator Controller
December 2004
LM2648
Two-Phase, Synchronous Step-Down 3-Channel
Switching Regulator Controller
General Description
The LM2648 consists of two current mode and two voltage
mode synchronous buck regulator controllers providing 3
outputs at a switching frequency of 300kHz.
Each pair of 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 current mode regulator outputs operate as a dual-
phase, single output regulator for high current applications.
Current-mode feedback control on Channel 3 assures supe-
rior line and load regulation and wide loop bandwidth as-
sures excellent response to fast load transients. Channels 1
and 2 employ voltage-mode feedback control.
The LM2648 features analog soft-start circuitry that is inde-
pendent of the output load and output capacitance. This
makes the soft-start behavior more predictable than tradi-
tional soft-start circuits. Sequential startup is built in and
requires a single capacitor to set the timing.
The LM2648 has over-voltage protection and under-voltage
protection for all outputs. Two additional comparator inputs
(analog and logic level) are provided to shut down the IC for
any user defined protection. The FAULT_DELAY pin allows
delayed shut off time for the IC during an under-voltage or
PROT-IN2 fault. The LM2648 also features an adjustable
UVLO feature.
Features
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Four synchronous buck regulators
Channel 3: Two-phase, current mode controller
4.5V to 18V input range
Built in sequential startup
Channels 1 and 2: Independent, 180藲 out of phase
voltage mode controllers
Single soft start for channels 1 and 2
Adjustable cycle-by-cycle current limit for each channel
Adjustable reference current
Adjustable input under-voltage lockout
Output over-voltage latch protection
Output under-voltage protection with delay
Two comparator inputs for user defined protection - one
with delay
Thermal shutdown
Self-discharge of output capacitors when the regulator is
off
TSSOP package
Applications
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Embedded Computer Systems
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Interactive Games
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Set-top Boxes/Home Gateways
Block Diagram
20059690
漏 2004 National Semiconductor Corporation
DS200596
www.national.com

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