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Linear - Synchronous Step-Down Switching Regulators

Numéro de référence LTC1929-PG
Description Synchronous Step-Down Switching Regulators
Fabricant Linear 
Logo Linear 





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LTC1929-PG fiche technique
FEATURES
s 2-Phase Single Output Controller
s Reduces Required Input Capacitance and Power
Supply Induced Noise
s Current Mode Control Ensures Current Sharing
s Phase-Lockable Fixed Frequency: 150kHz to 300kHz
s True Remote Sensing Differential Amplifier
s OPTI-LOOPTM Compensation Improves Transient
Response
s ±1% Output Voltage Accuracy
s Power Good Output Voltage Monitor (LTC1929-PG)
s Wide VIN Range: 4V to 36V Operation
s Very Low Dropout Operation: 99% Duty Cycle
s Adjustable Soft-Start Current Ramping
s Internal Current Foldback
s Short-Circuit Shutdown Timer with Defeat Option
s Overvoltage Soft-Latch Eliminates Nuisance Trips
s Available in 28-Lead SSOP Package
U
APPLICATIO S
s Desktop Computers
s Internet/Network Servers
s Large Memory Arrays
s DC Power Distribution Systems
LTC1929/LTC1929-PG
2-Phase, High Efficiency,
Synchronous Step-Down
Switching Regulators
DESCRIPTIO
The LTC®1929/LTC1929-PG are 2-phase, single output,
synchronous step-down current mode switching regula-
tor controllers that drive N-channel external power MOSFET
stages in a phase-lockable fixed frequency architecture.
The 2-phase controllers drive their two output stages out
of phase at frequencies up to 300kHz to minimize the RMS
ripple currents in both input and output capacitors. The
2-phase technique effectively multiplies the fundamental
frequency by two, improving transient response while
operating each channel at an optimum frequency for
efficiency. Thermal design is also simplified.
An internal differential amplifier provides true remote
sensing of the regulated supply’s positive and negative
output terminals as required by high current applications.
The RUN/SS pin provides soft-start and a defeatable,
timed, latched short-circuit shutdown to shut down both
channels. Internal foldback current limit provides protec-
tion for the external synchronous MOSFETs in the event of
an output fault. OPTI-LOOP compensation allows the
transient response to be optimized over a wide range of
output capacitance and ESR values.
, LTC and LT are registered trademarks of Linear Technology Corporation.
OPTI-LOOP is a trademark of Linear Technology Corporation.
TYPICAL APPLICATIO
0.1µF
0.1µF
VIN TG1
BOOST1
LTC1929 SW1
RUN/SS
BG1
1000pF
10k
100pF
ITH
PGND
SENSE1+
SENSE1
TG2
SGND
BOOST2
16k
16k
VDIFFOUT
EAIN
VOS–
VOS+
SW2
BG2
INTVCC
SENSE2+
SENSE2
10
0.47µF
0.47µF
10µF
10µF
35V
CERAMIC
×4
L1
1µH
D1
0.002
L2
D2 1µH
0.002
COUT: T510E108K004AS L1, L2: CEPH149-1ROMC
Figure 1. High Current 2-Phase Step-Down Converter
VIN
5V TO 28V
VOUT
1.6V/40A
+ COUT
1000µF
4V
×2
1929 F01
1

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