LTC3608(RevC) Просмотр технического описания (PDF) - Linear Technology
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LTC3608 Datasheet PDF : 26 Pages
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Features
n 8A Output Current
n Wide VIN Range = 4V to 18V
n Internal N-Channel MOSFETs
n True Current Mode Control
n Optimized for High Step-Down Ratios
n tON(MIN) ≤ 100nsec
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
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 7mm × 8mm 52-Lead QFN Package
Applications
n Point of Load Regulation
n Distributed Power Systems
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.
LTC3608
18V, 8A Monolithic
Synchronous Step-Down
DC/DC Converter
Description
The LTC®3608 is a high efficiency, monolithic synchronous
step-down DC/DC converter that can deliver up to 8A output
current from a 4V to 18V (20V 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 LTC3608 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, an output overvoltage comparator and an optional
short-circuit shutdown timer. Soft-start capability for sup-
ply sequencing is accomplished using an external timing
capacitor. The regulator current limit is user programmable.
A power good output voltage monitor indicates when
the output is in regulation. The LTC3608 is available in a
compact 7mm × 8mm QFN package.
Typical Application
High Efficiency Step-Down Converter
0.1µF VOUT
100pF
1500pF
11.3k
VON
ION
RUN/SS VIN
LTC3608
SW
ITH
BOOST
SGND INTVCC
FCB
VRNG
PGOOD PGND
EXTVCC VFB
3608 TA01a
187k
0.8µH
0.22µF
VIN
4V TO 18V
10µF
×3
100µF
×2
VOUT
2.5V
8A
4.7µF
30.1k
9.53k
Efficiency and Power Loss
vs Load Current
100
10000
95
EFFICIENCY
90
85
1000
80
75
100
70
65
60
55
50
0.01
POWER LOSS
10
VIN = 12V
VOUT = 2.5V
EXTVCC = 5V 1
0.1
1
10
LOAD CURRENT (A)
3608 TA01b
3608fc
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