参数资料
型号: LTC3729LEUH-6#TR
厂商: Linear Technology
文件页数: 1/28页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM CM 32-QFN
标准包装: 2,500
系列: PolyPhase®
PWM 型: 电流模式
输出数: 1
频率 - 最大: 620kHz
占空比: 99.5%
电源电压: 4 V ~ 30 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 85°C
封装/外壳: 32-WFQFN 裸露焊盘
包装: 带卷 (TR)
LTC3729L-6
PolyPhase, Synchronous
Step-Down Switching Regulator
FEATURES
DESCRIPTIO
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
Reduces Required Input Capacitance and Power
Supply Induced Noise
True Remote Sensing Differential Amplifier
0.6V, ± 1% Voltage Reference Accuracy
PolyPhase Controller Operates from Two to Twelve
Phases
Current Mode Control Ensures Current Sharing
Phase-Lockable Fixed Frequency: 250kHz to 550kHz
OPTI-LOOP ? Compensation Reduces C OUT
Power Good Output Voltage Monitor
Wide V IN Range: 4V to 30V Operation
Very Low Dropout Operation: 99% Duty Cycle
Adjustable Soft-Start Current Ramping
Internal Current Foldback Plus Shutdown Timer
Overvoltage Soft-Latch Eliminates Nuisance Trips
Micropower Shutdown
32-Lead 5mm × 5mm Plastic QFN Package
The LTC ? 3729L-6 is a PolyPhase TM synchronous step -
down current mode switching regulator controller with a
0.6V reference that drives N-channel external power
MOSFET stages in a phase-lockable fixed frequency archi-
tecture. The PolyPhase controller drives its two output
stages out of phase at frequencies up to 550kHz to
minimize the RMS ripple currents in both input and output
capacitors. The output clock signal allows expansion for
up to 12 evenly phased controllers for systems requiring
15A to 200A of output current. This PolyPhase technique
effectively multiplies the fundamental frequency by the
number of channels used, 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 for high current applications.
APPLICATIO S
A RUN/SS pin provides both soft-start and optional timed,
short-circuit shutdown. Current foldback limits MOSFET
s
s
s
s
Desktop Computers
Internet Servers
Large Memory Arrays
DC Power Distribution Systems
dissipation during short-circuit conditions when the
overcurrent latchoff is disabled. OPTI-LOOP compensa-
tion allows the transient response to be optimized over a
wide range of output capacitance and ESR values. The
, LTC and LT are registered trademarks of Linear Technology Corporation.
OPTI-LOOP is a registered trademark of Linear Technology Corporation.
PolyPhase is a trademark of Linear Technology Corporation.
LTC3729L-6 includes a power good output pin that
indicates when the output voltage is inside the ± 10%
tolerance window.
TYPICAL APPLICATIO
0.1 μ F
10 ?
10 μ F × 6
V IN
5V TO 15V
BG1
SENSE1 –
TG2
V OS
SENSE2
1.5k
3300pF
S
S
60.4k
S
0.1 μ F
10k
V IN LTC3729L-6 TG1
BOOST1
SW1
RUN/SS
PGOOD PGND
SENSE1 +
I TH
CLKOUT
SGND BOOST2
SW2
V DIFFOUT BG2
EAIN INTV CC
– +
V OS + SENSE2 –
S
S
S
S
S
0.47 μ F
0.47 μ F
S
10 μ F CER
X5R
M3
M4
× 2
M1
M2
× 2
D2
D1
L2
1 μ H
35V
CERAMIC
0.002 ?
L1
1 μ H
0.002 ?
+
V OUT
0.7V/40A
C OUT
270 μ F × 4
2V
C OUT : T510E108K004AS
D1, D2: SBM540
L1, L2: CEPH149-IROMC-H
M1, M3: Si7840DP
M2, M4: Si7440DP
3729L-6 TA01
Figure 1. High Current Dual Phase Step-Down Converter
sn3729l6 3729l6fs
1
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