參數(shù)資料
型號(hào)： LTC3823IGN#TRPBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： 4 A SWITCHING CONTROLLER, PDSO28
封裝： 0.150 INCH, LEAD FREE, PLASTIC, SSOP-28
文件頁(yè)數(shù)： 1/26頁(yè)
文件大?。?/td> 302K
代理商： LTC3823IGN#TRPBF
LTC3823
1
3823fd
FEATURES
APPLICATIONS
DESCRIPTION
Fast No RSENSETM Step-Down
Synchronous DC/DC Controller
with Differential Output Sensing,
Tracking and PLL
The LTC
3823 is a synchronous step-down switching regu-
lator controller with true remote differential output sensing
andoutputvoltageup/downtrackingcapability.Itsadvanced
functionsandhighaccuracyreferenceareidealforpowering
high performance server, ASIC and computer memory
systems.
The LTC3823 uses a constant on-time, valley current
mode control architecture to deliver very low duty fac-
tors without requiring a sense resistor. The operating
frequency is selected by an external resistor and is com-
pensated for variations in input supply voltage. An internal
phase-locked loop allows the IC to be synchronized to an
external clock.
Fault protection is provided by an overvoltage compara-
tor and input undervoltage lockout. The regulator current
limit is user programmable. A wide supply range allows
voltages as high as 36V to be stepped down to as low as
a 0.6V output. When using remote sense, output voltages
up to 3.3V can be developed, and up to 90% of VIN without
remote sense. Power supply sequencing is accomplished
using an external soft-start timing capacitor.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
No RSENSE is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners. Protected by U.S. Patents including 5481178, 5847554,
6580258, 6304066, 6476589, 6774611.
n Wide VIN Range: 4.5V to 36V
n ±0.67%, 0.6V Reference Voltage
n Output Voltage Tracking Capability
n True Remote Sensing Differential Amplier
n Sense Resistor Optional
n True Current Mode Control
n 2% to 90% Duty Cycle at 200kHz
n tON(MIN) < 100ns
n Phase-Locked Loop Frequency Synchronization
n Powerful Dual N-Channel MOSFET Driver
n Adjustable Cycle-by-Cycle Current Limit
n Adjustable Switching Frequency
n Programmable Soft-Start
n Current Foldback Protection (Disabled at Start-Up)
n Output Overvoltage Protection
n Micropower Shutdown: 30μA
n Power Good Output Voltage Monitor Tracks the
Reference Input Pin
n Available in (5mm
× 5mm) 32-Lead QFN and
28-Lead SSOP Narrow Packages
n Distributed Power Systems
n Server Power Supplies
CMDSH-3
B340A
9.5k
1.8μH
10μF
35V
3
VIN
5V TO 28V
VOUT
2.5V
10A
180μF
4V
2
Si4874
Si4884
68k
0.1μF
0.22μF
10k
1000pF
VOUT
3k
10k
0.01μF
+
ION
VIN
TG
SW
BOOST
PLLIN
RUN
ITH
SGND
INTVCC
BG
PGND
SENSE–
SENSE+
VOUTSENSE+
VFB
LTC3823
DRVCC
PGOOD
VOUTSENSE–
VDIFFOUT
VON
VRNG
TRACK/SS
PLLFLTR
3823 TA01a
LOAD CURRENT (A)
0.1
87
EFFICIENCY
(%)
POWER
LOSS
(W)
88
90
91
92
97
94
0.01
0.1
10
1
3823 TA01b
89
95
96
93
10
VIN = 5V
VOUT = 2.5V
FIGURE 12 CIRCUIT
EFFICIENCY
POWER LOSS
Efciency and Power Loss
vs Load Current
High Efciency Step-Down Converter
TYPICAL APPLICATION
相關(guān)PDF資料
PDF描述
LTC3851AEMSE-1#PBF 0.05 A SWITCHING CONTROLLER, 810 kHz SWITCHING FREQ-MAX, PDSO16
LTC3851AIUD-1#TRPBF 0.05 A SWITCHING CONTROLLER, 810 kHz SWITCHING FREQ-MAX, PQCC16
LTC3851AMPMSE-1#PBF 0.05 A SWITCHING CONTROLLER, 810 kHz SWITCHING FREQ-MAX, PDSO16
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相關(guān)代理商/技術(shù)參數(shù)
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