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LM2642MTC-LM2642MTCX
Two-Phase Synchronous Step-Down Switching Controller
LM2642
Two-Phase Synchronous Step-Down Switching
Controller
General DescriptionThe LM2642 consistsof two current mode synchronous
buck regulator controllers witha switching frequencyof
300kHz.
The two switching regulator controllers operate 180˚ outof
phase. This feature reduces the input ripple RMS current,
thereby significantly reducingthe required input capacitance.
The two switching regulator outputs can alsobe paralleledto
operateasa dual-phase single output regulator.
The outputof each channel canbe independently adjusted
from1.3to VIN• maximum duty cycle.An internal5V railis
also available externallyfor driving bootstrap circuitry.
Current-mode feedback control assures excellent line and
load regulation anda wide loop bandwidthfor excellent
responseto fast load transients. Currentis sensed across
eitherthe Vdsofthe top FETor acrossan external current-
sense resistor connectedin series with the drainof the top
FET. Current limitis independently adjustablefor each chan-
nel.
The LM2642 features analog soft-start circuitry thatis inde-
pendentof the output load and output capacitance. This
makesthe soft-start behavior more predictable and control-
lable than traditional soft-start circuits. PGOOD1 pinis providedto monitor thedc outputof
channel1. Over-voltage protectionis availablefor both out-
puts.A UV-Delaypinis also availableto allow delayed shut
off timefor theIC duringan output under-voltage event.
Features Two synchronous buck regulators 180˚outof phase operation 4.5Vto 30V input range Power good function monitors Ch.1 37µA Shutdown current 0.04% (typical) line and load regulation error Current mode control withor withouta sense resistor Independent enable/soft-start pins allow simple
sequential startup configuration. Configurablefor single output parallel operation. (See
Figure2). Adjustable cycle-by-cycle current limit Input under-voltage lockout Output over-voltage latch protection Output under-voltage protection with delay Thermal shutdown Self dischargeof output capacitors when the regulatoris
OFF TSSOP package
Applications Embedded computer systems High end gaming systems Set-top boxes WebPAD
Block DiagramJanuary 2004
LM2642
wo-Phase
Synchronous
Step-Down
Switching
Controller
