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LCGW Datasheet(PDF) 1 Page - Linear Technology

Part # LCGW
Description  1A, 2.2MHz Step-Down Switching Regulator in 2mm3mm DFN
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LCGW Datasheet(HTML) 1 Page - Linear Technology

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LT3505
1
3505fc
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
1.2A, Step-Down
Switching Regulator in
3mm
× 3mm DFN
The LT®3505 is a current mode PWM step-down DC/DC
converter with an internal 1.4A power switch. The wide
operating input range of 3.6V to 36V (40V maximum)
makes the LT3505 ideal for regulating power from a wide
variety of sources, including unregulated wall transform-
ers, 24V industrial supplies and automotive batteries. The
oscillatorcanbeprogrammedforhighfrequencyoperation
allowing the use of tiny, low cost external components or
it can be programmed for lower frequency operation to
maximize efficiency.
Cycle-by-cycle current limit provides protection against
shorted outputs and soft-start eliminates input current
surge during start-up. The low current (<2µA) shutdown
mode provides output disconnect, enabling easy power
management in battery-powered systems.
750kHz, 3.3V Step-Down Converter
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
!
Wide Input Range: 3.6V to 36V Operating,
40V Maximum
!
Up to 1.2A Output Current
!
Resistor-Programmable Fixed-Frequency Operation
from 200kHz to 3MHz
!
Output Adjustable Down to 780mV
!
Short-Circuit Robust
!
Uses Tiny Capacitors and Inductors
!
Soft-Start
!
Low Shutdown Current: <2µA
!
Low VCESAT Switch: 350mV at 1A
!
Thermally Enhanced, Low Profile 3mm x 3mm
DFN-8 and MSOP-8 Packages
!
Automotive Battery Regulation
!
Industrial Control Supplies
!
Wall Transformer Regulation
!
Distributed Supply Regulation
!
Battery-Powered Equipment
VIN
4.2V TO 36V
ON OFF
0.1
µF 10µH
36.5k
10
µF
3505 TA01
22pF
68pF
1
µF
75.0k
11.3k
VOUT
3.3V
1.1A, VIN > 5V
1.2A, VIN > 8V
69.8k
GND
BOOST
FB
VC
SW
LT3505
VIN
SHDN
RT
Efficiency
LOAD CURRENT (A)
70
80
60
50
0.4
0.8
1.2
0.2
0
0.6
1.0
90
65
75
55
85
VIN = 12V
VOUT = 3.3V
fSW = 750kHz
L = 10 H


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