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参数资料
型号： LTC3852IUDD#TRPBF
厂商： LINEAR TECHNOLOGY CORP
元件分类： 稳压器
英文描述： 0.05 A SWITCHING CONTROLLER, 810 kHz SWITCHING FREQ-MAX, PQCC24
封装： 3 X 5 MM, LEAD FREE, PLASTIC, QFN-24
文件页数： 1/32页
文件大小： 414K
代理商： LTC3852IUDD#TRPBF
LTC3852
1
3852f
TYPICAL APPLICATION
FEATURES
DESCRIPTION
Low Input Voltage,
Synchronous Step-Down
DC/DC Controller
The LTC3852 is a constant frequency, current mode
step-down DC/DC controller which can be powered by an
onboard charge pump. Input supplies as low as 2.7V, when
doubled by the charge pump, provide 5V to the LTC3852’s
control logic and gate drives, supporting a wide selection
of logic-level N-channel power MOSFETs.
Theconstant-frequencycurrentmodearchitectureallowsfor
a phase-lockable xed frequency of up to 750kHz. The RUN
pinprovidesaprecisionenablethresholdwhiletheTRACK/SS
pin combines tracking and adjustable soft-start features.
The MODE/PLLIN pin selects among Burst Mode oper-
ation, pulse-skipping mode, and continuous current mode.
Current foldback limits MOSFET power dissipation during
short-circuit conditions. Reverse current and current
foldback functions are disabled during soft-start. A power
good output pin indicates when the output is within ±10%
of its designed set point.
Efciency and Power Loss
vs Load Current
APPLICATIONS
n Charge Pump Input Range: 2.7V to 5.5V
n Controller Input Range: 4V to 38V
n Integrated Charge Pump Provides 5V Gate Drive to
Logic Level MOSFETs
n RSENSE or DCR Current Sensing
n ±1.25% Output Voltage Accuracy Over Temperature
n Phase-Lockable Fixed Frequency: 250kHz to 750kHz
n Power Good Output Voltage Monitor
n Adjustable Soft-Start Voltage Ramping
n Current Foldback Disabled During Start-Up
n No Reverse Current During Soft-Start
n Selectable Constant Frequency, Pulse-Skipping, or
Burst Mode Operation
n Output Overvoltage Protection
n Very Low Dropout Operation: 99% Duty Cycle
n Available in a 24-Lead (3mm
5mm) QFN Package
n General Purpose 3.3V Systems
n Lithium-Ion Powered Devices
n Distributed DC Power Systems
L, LT, LTC, LTM, Linear Technology, Burst Mode 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 5408150, 5481178,
5705919, 6498466, 6580258, 6611131.
PGO0D
C+
C–
RUN
SHDN
TRACK/SS
ITH
MODE/PLLIN
FREQ/PLLFLTR
VIN1
INTVCC
TG
SW
INTVCC
BG
SENSE+
SENSE–
VFB
VPUMP
VIN2
GND2
GND1
0.1μF
4.7μF
2.1k
LTC3852
22μF
VIN
2.7V TO 5.5V
VOUT
1.2V
20A
3852 TA01
0.36μH
100pF
CHARGE PUMP
2.2μF
1nF
0.1μF
100k
470μF
×2
BOOST
12.1k
40.2k
1%
20k
1%
95.3k
+
ON
OFF
High Efciency Synchronous Step-Down Converter
LOAD CURRENT (A)
120
10
0
EFFICIENCY
(%)
POWER
LOSS
(W)
100
90
80
70
60
50
40
30
20
10
0
5
4.5
4
3.5
3
2.5
2
1.5
1
0.5
3852 TA01a
EFFICIENCY
POWER LOSS
相关PDF资料
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相关代理商/技术参数
参数描述
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