參數(shù)資料
型號： LTC3856EUH#TRPBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, PQCC38
封裝： 5 X 5 MM, LEAD FREE, PLASTIC, MO-220WHHD-X, QFN-32
文件頁數(shù)： 1/40頁
文件大?。?/td> 2222K
代理商： LTC3856EUH#TRPBF
LTC3856
3856f
LOAD CURRENT (A)
0.1
40
EFFICIENCY
(%)
POWER
LOSS
(W)
50
60
70
80
1
10
100
30
20
10
0
90
100
1
10
0
–1
100
3856 TA01b
VIN = 12V
VOUT = 1.5V
Burst Mode
OPERATION
Typical applicaTion
DescripTion
2-Phase Synchronous
Step-Down DC/DC
Controller with Diffamp
The LTC3856 is a single output, dual channel PolyPhase
synchronous step-down DC/DC controller that drives all
N-channel power MOSFET stages. This device includes a
high speed differential amplifier for remote output volt-
age sense. Power loss and supply noise are minimized by
operating the two controller output stages out-of-phase
and up to 12-phase operation can be achieved.
The LTC3856 monitors the output current by sensing
the voltage drop across the output inductor (DCR) or by
using a sense resistor. DCR temperature compensation
maintains an accurate current sense threshold over a
broad temperature range. A constant-frequency, current
mode architecture allows a phase-lockable frequency of
up to 770kHz.
A wide 4.5V to 38V input supply range encompasses
most intermediate bus voltages and battery chemistries.
Burst Mode operation, continuous or Stage Shedding
modes are supported. A TK/SS pin shared by both chan-
nels ramps the output voltage during start-up.
FeaTures
applicaTions
n
PolyPhase Controller Reduces Input and Output
Capacitance and Power Supply Induced Noise
n
Wide VIN Range: 4.5V to 38V Operation
n
±0.75%, 0.6V Reference Voltage Accuracy
n
High Efficiency: Up to 95%
n
Programmable Burst Mode Operation or
Stage Shedding for Highest Light Load Efficiency
n
Active Voltage Positioning (AVP)
n
RSENSE or DCR Current Sensing
n
Programmable DCR Temperature Compensation
n
Phase-Lockable Fixed Frequency: 250kHz to 770kHz
n
True Remote Sense Differential Amplifier
n
Dual N-Channel MOSFET Synchronous Drive
n
VOUT Range: 0.6V to 5V without Differential Amplifier
n
VOUT Range: 0.6V to 3.3V with Differential Amplifier
n
Adjustable Soft-Start or VOUT Tracking
n
Stackable for Up to 12-Phase Operation
n
32-Pin (5mm
× 5mm) QFN and 38-Pin TSSOP Packages
n
Telecom and Datacom Systems
n
Industrial and Medical Instruments
n
DC Power Distribution Systems
n
Computer Systems
L
, LT, LTC, LTM, Linear Technology, the Linear logo, PolyPhase, Burst Mode and OPTI-LOOP
are registered trademarks and Stage Shedding 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, 6304066, 6498466,
6580258, 6611131, 6674274.
Efficiency and Power Loss
vs Output Current
High Efficiency 1.5V/50A Step-Down Converter
3856 TA01a
TG1
BOOST1
SW1
BG1
PLLIN
SENSE1+
SENSE1–
TG2
BOOST2
SW2
BG2
INTVCC
SENSE2+
SENSE2–
DIFFOUT
VFB
ILIM
RUN
PGOOD
CLKOUT
PHASMD
MODE
ITEMP
FREQ
EXTVCC
VIN
DIFFN
DIFFP
ISET
AVP
GND
TK/SS
ITH
LTC3856
30.1k
20k
S
122k
10F
4
100F
8
VOUT
1.5V
50A
0.33H
VIN
4.5V TO
20V
0.1F
S
4.7F
0.1F
2200pF
1.5k 0.1F
S
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PDF描述
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相關代理商/技術參數(shù)
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