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LCYK 数据表(PDF) 1 Page - Linear Technology

部件名 LCYK
功能描述  36V, 3.5A, 2.4MHz Step-Down Switching Regulator with 75關A Quiescent Current
Download  24 Pages
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

LCYK 数据表(HTML) 1 Page - Linear Technology

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LT3680
1
3680fa
36V, 3.5A, 2.4MHz
Step-Down Switching Regulator
with 75µA Quiescent Current
The LT
®3680 is an adjustable frequency (200kHz to
2.4MHz) monolithic buck switching regulator that accepts
input voltages up to 36V. A high efficiency 95m switch
is included on the die along with a boost Schottky diode
and the necessary oscillator, control, and logic circuitry.
Current mode topology is used for fast transient response
and good loop stability. Low ripple Burst Mode operation
maintains high efficiency at low output currents while
keeping output ripple below 15mV in a typical application.
In addition, the LT3680 can further enhance low output
current efficiency by drawing bias current from the output
when VOUT is above 3V. Shutdown reduces input supply
current to less than 1μA while a resistor and capacitor on
the RUN/SS pin provide a controlled output voltage ramp
(soft-start). A power good flag signals when VOUT reaches
91% of the programmed output voltage. The LT3680 is
available in 10-Pin MSOP and 3mm
× 3mm DFN packages
with exposed pads for low thermal resistance.
Automotive Battery Regulation
Power for Portable Products
Distributed Supply Regulation
Industrial Supplies
Wall Transformer Regulation
Wide Input Voltage Range: 3.6V to 36V
3.5A Maximum Output Current
Low Ripple (<15mVP-P) Burst Mode
® Operation:
IQ = 75μA at 12VIN to 3.3VOUT
Adjustable Switching Frequency: 200kHz to 2.4MHz
Low Shutdown Current: IQ < 1μA
Integrated Boost Diode
Synchronizable Between 250kHz to 2MHz
Power Good Flag
Saturating Switch Design: 95m On-Resistance
0.790V Feedback Reference Voltage
Output Voltage: 0.79V to 30V
Thermal Protection
Soft-Start Capability
Small 10-Pin Thermally Enhanced MSOP and
(3mm
× 3mm) DFN Packages
5V Step-Down Converter
SW
FB
VC
PG
RT
VIN
BD
VIN
6.3V TO 36V
VOUT
5V
3.5A
10μF
0.47μF
680pF
47μF
100k
15k
63.4k
4.7μH
536k
GND
OFF ON
LT3680
3680 TA01a
RUN/SS
BOOST
SYNC
Efficiency
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
OUTPUT CURRENT (A)
0
0.5
50
70
100
1
2
2.5
3680 G01
60
90
80
1.5
3
3.5
VIN = 12V
VIN = 34V
VOUT = 5V
L = 4.7μH
f = 600kHz
VIN = 24V
TYPICAL APPLICATION
DESCRIPTION
FEATURES
APPLICATIONS


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