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LTC3864EDE#TRPBF 数据手册 - Linear Technology（凌力尔特）
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Linear Technology（凌力尔特）
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稳压芯片
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WFDFN-12
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LTC3864EDE#TRPBF数据手册
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LTC3864
1
3864fa
For more information www.linear.com/LTC3864
Typical applicaTion
FeaTures
DescripTion
60V Low I
Q
Step-Down
DC/DC Controller with
100% Duty Cycle Capability
The LTC
®
3864 is a robust, high voltage step-down DC/DC
controller optimized for automotive and industrial applica-
tions. It drives a P-channel power MOSFET switch allowing
100%
duty cycle
operation. The wide input and output volt-
age ranges cover a multitude of applications. This device
has been verified with the failure mode and effects analysis
(FMEA) procedure for operation during failure conditions.
The LTC3864 offers excellent light load efficiency, draw
-
ing only 40µA quiescent current in a user programmable
Burst Mode operation. Its peak current mode, constant
frequency PWM ar
chitecture provides for good control of
switching frequency and output current limit. The switch-
ing frequency can be programmed from 50kHz to 850kHz
with an external resistor and can be synchronized to an
external clock from 75kHz to 750kHz.
The LTC3864 offers programmable soft-start or output
tracking. Safety features include overvoltage protection,
overcurrent and short-circuit protection including fre-
quency foldback and a power good output signal.
The LTC3864 is available in thermally enhanced 12-Pin
MSOP and 3mm × 4mm DFN packages.
5.2V to 60V Input, 5V/2A Output, 350kHz Step-Down Converter
applicaTions
n
Wide Operating V
IN
Range: 3.5V to 60V
n
Wide V
OUT
Range: 0.8V to V
IN
n
Low Operating I
Q
= 40µA
n
Very Low Dropout Operation: 100% Duty Cycle
n
Strong High Voltage MOSFET Gate Driver
n
Constant Frequency Current Mode Architecture
n
Verified FMEA for Adjacent Pin Open/Short
n
Selectable High Efficiency Burst Mode
®
Operation or
Pulse-Skipping Mode at Light Loads
n
Programmable Fixed Frequency: 50kHz to 850kHz
n
Phase-Lockable Frequency: 75kHz to 750kHz
n
Accurate Current Limit
n
Programmable Soft-Start or Voltage Tracking
n
Internal Soft-Start Guarantees Smooth Start-Up
n
Power Good Output Voltage Monitor
n
Low Shutdown I
Q
= 7µA
n
Available in Small 12-Pin Thermally Enhanced MSOP
and DFN Packages
n
Industrial and Automotive Power Supplies
n
Telecom Power Supplies
n
Distributed Power Systems
L, LT, LTC, LTM, OPTI-LOOP, Linear Technology, Burst Mode and the Linear logo are registered
trademarks and Hot Swap is a trademark of Linear Technology Corporation. All other trademarks
are the property of their respective owners. Protected by U.S. Patents including 5731694.
Efficiency
350kHz
100k
25mΩ
10µH
CAP
0.47µF
10µF
PGND
LTC3864
3864 TA01a
SS
ITH
FREQ
SGND
RUN
V
IN
PLLIN/MODE
SENSE
GATE
PGOOD
V
FB
9.09k
422k
47µF
×2
V
OUT
*
5V
2A
80.6k
V
IN
*
5.2V TO 60V
3.3nF
*V
OUT
FOLLOWS V
IN
WHEN 3.5V ≤ V
IN
≤ 5.2V
LOAD CURRENT (A)
0.01
50
EFFICIENCY (%)
80
70
60
90
100
0.1 1
3864 TA01b
PULSE-SKIPPING
Burst Mode
OPERATION
V
IN
= 12V
V
OUT
= 5V
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