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參數資料
| 型號： | LTC3611IWP#TR |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩壓器 |
| 英文描述： | 10 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PQCC64 |
| 封裝： | 9 X 9 MM, PLASTIC, QFN-64 |
| 文件頁數： | 1/26頁 |
| 文件大小： | 411K |
| 代理商： | LTC3611IWP#TR |
LTC3611
3611fd
ApplicAtions
typicAl ApplicAtion
Description
10A, 32V Monolithic
Synchronous Step-Down
DC/DC Converter
TheLTC3611isahighefciency,monolithicsynchronous
step-down DC/DC converter that can deliver up to 10A
output current from a 4.5V to 32V (36V maximum) input
supply. It uses a constant on-time valley current mode
control architecture to deliver very low duty cycle opera-
tion at high frequency with excellent transient response.
The operating frequency is selected by an external resistor
and is compensated for variations in VIN and VOUT.
The LTC3611 can be congured for discontinuous or
forced continuous operation at light load. Forced continu-
ous operation reduces noise and RF interference while
discontinuous mode provides high efciency by reducing
switching losses at light loads.
Fault protection is provided by internal foldback current
limiting,anoutputovervoltagecomparatorandanoptional
short-circuitshutdowntimer.Soft-startcapabilityforsup-
ply sequencing is accomplished using an external timing
capacitor.Theregulatorcurrentlimitisuserprogrammable.
A power good output voltage monitor indicates when
the output is in regulation. The LTC3611 is available in a
compact 9mm
× 9mm QFN package.
Efciency and Power Loss
vs Load Current
FeAtures
n
10A Output Current
n
Wide VIN Range = 4.5V to 32V (36V Maximum)
n
Internal N-Channel MOSFETs
n
True Current Mode Control
n
Optimized for High Step-Down Ratios
n
t0N(MIN) ≤ 100ns
n
Extremely Fast Transient Response
n
Stable with Ceramic COUT
n
±1% 0.6V Voltage Reference
n
Power Good Output Voltage Monitor
n
Adjustable On-Time/Switching Frequency (>1MHz)
n
Adjustable Current Limit
n
Programmable Soft-Start
n
Output Overvoltage Protection
n
Optional Short-Circuit Shutdown Timer
n
Low Shutdown IQ: 15μA
n
Available in a 9mm
× 9mm 64-Pin QFN Package
n
Point of Load Regulation
n
Distributed Power Systems
High Efciency Step-Down Converter
1H
4.7F
10F
×3
VIN
4.5V TO 32V
VOUT
2.5V
10A
3611 TA01a
182k
0.1F
ION
VIN
SW
BOOST
RUN/SS
ITH
VON
SGND
INTVCC
FCB
PGND
VFB
VRNG
0.22F
100F
×2
12.5k
39.2k
INTVCC
11k
LTC3611
680pF
EXTVCC
PGOOD
30.1k
9.5k
100pF
VOUT
LOAD CURRENT (A)
0.01
0
EFFICIENCY
(%)
POWER
LOSS
(mW)
50
40
30
20
10
100
90
80
70
60
0.1
1
10
3611 TA01b
VOUT = 2.5V
VIN = 5V
VIN = 25V
POWER LOSS,
VIN = 25V
POWER LOSS,
VIN = 5V
1
10
100
1000
10000
L
, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Patents including 5481178, 6100678, 6580258, 5847554, 6304066.
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