參數(shù)資料
型號： LTC3891MPUDC#TRPBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, 900 kHz SWITCHING FREQ-MAX, PQCC20
封裝： 3 X 4 MM, LEAD FREE, PLASTIC, QFN-20
文件頁數(shù)： 1/32頁
文件大?。?/td> 1931K
代理商： LTC3891MPUDC#TRPBF
LTC3891
1
3891f
TYPICAL APPLICATION
FEATURES
DESCRIPTION
Low IQ, 60V Synchronous
Step-Down Controller
The LTC3891 is a high performance step-down switching
regulator DC/DC controller that drives an all N-channel
synchronous power MOSFET stage. A constant fre-
quencycurrentmodearchitectureallowsaphase-lockable
frequency of up to 750kHz.
The50μAno-loadquiescentcurrentextendsoperatingrun
timeinbattery-poweredsystems.OPTI-LOOPcompensa-
tion allows the transient response to be optimized over
a wide range of output capacitance and ESR values. The
LTC3891 features a precision 0.8V reference and power
good output indicator. A wide 4V to 60V input supply range
encompasses a wide range of intermediate bus voltages
andbatterychemistries. TheoutputvoltageoftheLTC3891
can be programmed between 0.8V to 24V.
The TRACK/SS pin ramps the output voltages during
start-up. Current foldback limits MOSFET heat dissipation
during short-circuit conditions. The PLLIN/MODE pin se-
lects among Burst Mode operation, pulse-skipping mode,
or continuous conduction mode at light loads.
Efficiency and Power Loss vs
Output Current
APPLICATIONS
n
Wide VIN Range: 4V to 60V (65V Abs Max)
n
Low Operating IQ: 50μA
n
Wide Output Voltage Range: 0.8V ≤ VOUT ≤ 24V
n
RSENSE or DCR Current Sensing
n
Phase-Lockable Frequency (75kHz to 750kHz)
n
Programmable Fixed Frequency (50kHz to 900kHz)
n
Selectable Continuous, Pulse-Skipping or Low Ripple
Burst Mode Operation at Light Load
n
Selectable Current Limit
n
Very Low Dropout Operation: 99% Duty Cycle
n
Adjustable Output Voltage Soft-Start or Tracking
n
Power Good Output Voltage Monitor
n
Output Overvoltage Protection
n
Low Shutdown IQ: < 14μA
n
Internal LDO Powers Gate Drive from VIN or EXTVCC
n
No Current Foldback During Start-Up
n
Small 20-Pin 3mm × 4mm QFN and TSSOP Packages
n
Automotive Always-On Systems
n
Battery Powered Digital Devices
n
Distributed DC Power Systems
L
, LT, LTC, LTM, OPTI-LOOP, Burst Mode, Linear Technology and the Linear logo are registered
trademarks of Linear Technology Corporation. All other trademarks are the property of their
respective owners. Patents, including 5481178, 5705919, 6611131, 6498466, 6580258,
7230497.
0.1F
22F
VIN
4V TO 60V
41.2k
10k
2200pF
100k
31.6k
3891 TA01a
2.2F
100pF
0.1F
FREQ
ITH
SGND
LTC3891
VIN
INTVCC
4.7H
8m
INTVCC
BOOST
SW
BG
SENSE+
SENSE–
TG
100k
150F
VOUT
3.3V
5A
TRACK/SS
VFB
PGOOD
OUTPUT CURRENT (A)
0
EFFICIENCY
(%)
POWER
LOSS
(mW)
70
100
1
0.1
0.01
0.001
0.0001
10
3891 TA01b
50
40
30
20
1
10
100
1000
10000
0.1
10
60
80
90
VIN = 12V
VOUT = 3.3V
High Efficiency 3.3V Step-Down Converter
相關(guān)PDF資料
PDF描述
LTC3891MPFE#PBF SWITCHING CONTROLLER, 900 kHz SWITCHING FREQ-MAX, PDSO20
LTC3891IUDC#PBF SWITCHING CONTROLLER, 900 kHz SWITCHING FREQ-MAX, PQCC20
LTC3891EUDC#PBF SWITCHING CONTROLLER, 900 kHz SWITCHING FREQ-MAX, PQCC20
LTC3900MPS8#TR SWITCHING REGULATOR, PDSO8
LTC3900MPS8#PBF SWITCHING REGULATOR, PDSO8
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