參數(shù)資料
型號(hào)： LTC3869IGN-2#TRPBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, PDSO28
封裝： 0.150 INCH, LEAD FREE, PLASTIC, SSOP-28
文件頁(yè)數(shù)： 1/40頁(yè)
文件大小： 2705K
代理商： LTC3869IGN-2#TRPBF
LTC3869/LTC3869-2
1
3869f
TYPICAL APPLICATION
DESCRIPTION
Dual, 2-Phase
Synchronous Step-Down
DC/DC Controllers
The LTC3869 is a high performance dual synchronous
step-down switching regulator controller that drives all
N-channelsynchronouspowerMOSFETstages.Aconstant
frequency current mode architecture allows a phase-
lockable frequency of up to 780kHz. Power loss and noise
due to the ESR of the input capacitors are minimized by
operating the two controller output stages out-of-phase.
OPTI-LOOP compensation allows the transient response
to be optimized over a wide range of output capacitance
and ESR values. The LTC3869 features a precision 0.6V
reference and a power good output indicator. A wide 4V
to 38V input supply range encompasses most battery
chemistries. Independent TK/SS pins for each controller
ramp the output voltage during start-up. Current foldback
limitsMOSFETheatdissipationduringshort-circuitcondi-
tions. The MODE/PLLIN pin selects among Burst Mode
operation, pulse-skipping mode, or continuous inductor
current mode and allows the IC to be synchronized to an
external clock.
TheLTC3869ispincompatiblewithLTC3850andis available
inbothlowprofile28-leadQFNandnarrowSSOPpackages.
L
, LT, LTC, LTM, Linear Technology, the Linear logo, OPTI-LOOP, Burst Mode and PolyPhase
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, 5705919, 5929620, 6100678, 6144194, 6177787, 6580258, 6498466, 6611131.
FEATURES
APPLICATIONS
n
Dual, 180° Phased Controllers Reduce Required
Input Capacitance and Power Supply Induced Noise
n
Accurate Multiphase Current Matching
n
RSENSE or DCR Current Sensing
n
±0.75% 0.6V Output Voltage Accuracy
n
Phase-Lockable Fixed Frequency 250kHz to 780kHz
n
High Efficiency: Up to 95%
n
Dual N-channel MOSFET Synchronous Drive
n
Wide VIN Range: 4V to 38V (40V Max) Operation
n
Wide VOUT Range: 0.6V to 12.5V Operation
n
Adjustable Soft-Start Current Ramping or Tracking
n
Foldback Output Current Limiting
n
Output Overvoltage Protection
n
Power Good Output Voltage Monitor
n
5V Low Dropout Regulator
n
Small 28-Lead QFN and Narrow SSOP Packages
n
Server Systems
n
Telecom Systems
n
Industrial and Medical Instruments
n
High Power Battery-Operated Devices
n
DC Power Distribution Systems
High Efficiency Dual 5V/3.3V Step-Down Converter
Efficiency and Power Loss
LOAD CURRENT (A)
0.01
EFFICIENCY
(%)
POWER
LOSS
(mW)
100
10
90
70
50
30
80
60
40
20
0
1300
500
1000
1100
1200
400
700
600
3869 TA01b
10
1
0.1
EFFICIENCY
POWER LOSS
900
800
VIN = 12V, VOUT = 3.3V
VIN = 12V, VOUT = 5V
0.1F
147k
3.2H
470pF
fIN
500kHz
1F
22F
47F
20k
15k
VOUT1
5V
5A
0.1F
2.2H
470pF
56F
20k
15k
122k
VOUT2
3.3V
5A
TG1
TG2
BOOST1
BOOST2
SW1
SW2
BG1
BG2
PGND
FREQ
SENSE1+
SENSE2+
RUN2
RUN1
SENSE1–
SENSE2–
VFB1
VFB2
ITH1
ITH2
VIN
INTVCC
TK/SS1
TK/SS2
VIN
7V TO
24V
3869 TA01
SGND
PGOOD
0.1F
LTC3869
MODE/PLLIN
ILIM
4.7F
+
90.9k
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