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參數資料
| 型號： | LTC3609IWKG#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩壓器 |
| 英文描述： | SWITCHING REGULATOR, PQCC52 |
| 封裝： | 8 X 7 MM, LEAD FREE, PLASTIC, QFN-52 |
| 文件頁數： | 1/26頁 |
| 文件大小： | 414K |
| 代理商： | LTC3609IWKG#PBF |
LTC3609
3609fb
Typical applicaTion
FeaTures
applicaTions
DescripTion
32V, 6A Monolithic
Synchronous Step-Down
DC/DC Converter
TheLTC3609isahighefficiency,monolithicsynchronous
step-downDC/DCconverterthatcandeliverupto6Aoutput
current from a 4V to 32V (36V maximum) input supply. It
uses a valley current control architecture to deliver very
low duty cycle operation 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 LTC3609 can be configured for discontinuous or
forced continuous operation at light load. Forced continu-
ous operation reduces noise and RF interference while
discontinuous mode provides high efficiency by reducing
switching losses at light loads.
Fault protection is provided by internal foldback current
limiting,anoutputovervoltagecomparatorandanoptional
short-circuit shutdown timer. Soft-start capability for sup-
ply sequencing is accomplished using an external timing
capacitor.Theregulatorcurrentlimitisuserprogrammable.
A power good output voltage monitor indicates when
the output is in regulation. The LTC3609 is available in a
compact 7mm
× 8mm QFN package.
n
6AOutputCurrent
n
WideVINRange=4Vto32V(36VMaximum)
n
InternalN-ChannelMOSFETs
n
TrueCurrentModeControl
n
OptimizedforHighStep-DownRatios
n
tON(MIN)≤100ns
n
ExtremelyFastTransientResponse
n
StablewithCeramicCOUT
n
±1%0.6VVoltageReference
n
Power Good Output Voltage Monitor
n
Adjustable On-Time/Switching Frequency
n
Adjustable Current Limit
n
Programmable Soft-Start
n
Output Overvoltage Protection
n
Optional Short-Circuit Shutdown Timer
n
Low Shutdown IQ: 15A
n
Available in a 7mm
× 8mm 52-Pin QFN Package
n
Point of Load Regulation
n
Distributed Power Systems
1.2H
4.7F
10F
x3
VIN
4V TO 32V
VOUT
2.5V
6A
3609 TA01a
187k
0.1F
ION
VIN
SW
BOOST
RUN/SS
ITH
VON
VOUT
SGND
INTVCC
FCB
PGND
VFB
VRNG
0.22F
100F
x2
15.8k
LTC3609
1000pF
EXTVCC
PGOOD
30.1k
9.53k
100pF
LOAD CURRENT (A)
0.01
EFFICIENCY
(%)
POWER
LOSS
(mW)
80
90
3609 TA01b
70
0
50
40
30
20
10
60
0.1
1
10
100
1000
100
1
10
10000
VOUT = 2.5V
EXTVCC = 5V
VIN = 12V
VIN = 25V
POWER LOSS
EFFICIENCY
HighEfficiencyStep-DownConverter
EfficiencyandPowerLoss
vsLoadCurrent
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.
Protected by U.S. Patents, including 5481178, 6100678, 6580258, 5847554, 6304066.
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