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Datasheet> All Categories > Power/power management> The power supply circuit> LTC1265CS-3.3#PBF
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LTC1265CS-3.3#PBF

Description
Conv DC-DC -0.3V to 13V Step Down Single-Out 3.3V 1.2A 14-Pin SOIC N Tube
CategoryPower/power management    The power supply circuit   
File Size231KB，16 Pages
ManufacturerADI
Websitehttps://www.analog.com
Environmental Compliance
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LTC1265CS-3.3#PBF Overview

Conv DC-DC -0.3V to 13V Step Down Single-Out 3.3V 1.2A 14-Pin SOIC N Tube

LTC1265CS-3.3#PBF Parametric

Parameter NameAttribute value
EU restricts the use of certain hazardous substancesCompliant
ECCN (US)EAR99
Part StatusActive
HTS8542.39.00.01
TypeStep Down
Output TypeFixed
Switching Frequency (kHz)700
Switching RegulatorYes
Number of Outputs1
Output Voltage (V)3.3
Maximum Output Current (A)1.2
Minimum Input Voltage (V)-0.3
Typical Input Voltage (V)10
Maximum Input Voltage (V)13
Operating Supply Voltage (V)10
Line Regulation40mV
Load Regulation65mV
Efficiency (%)95
Minimum Operating Temperature (°C)0
Maximum Operating Temperature (°C)70
Supplier Temperature GradeCommercial
PackagingTube
Pin Count14
Standard Package NameSOP
Supplier PackageSOIC N
MountingSurface Mount
Package Height1.5(Max)
Package Length8.74(Max)
Package Width3.99(Max)
PCB changed14
Lead ShapeGull-wing

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Download Datasheet
LTC1265/LTC1265-3.3/LTC1265-5
1.2A, High Efficiency
Step-Down DC/DC Converter
FEATURES
s
s
DESCRIPTIO
s
s
s
s
s
s
s
s
High Efficiency: Up to 95%
Current Mode Operation for Excellent Line and Load
Transient Response
Internal 0.3
Ω
Power Switch (V
IN
= 10V)
Short-Circuit Protection
Low Dropout Operation: 100% Duty Cycle
Low-Battery Detector
Low 160µA Standby Current at Light Loads
Active-High Micropower Shutdown: I
Q
< 15µA
Peak Inductor Current Independent of Inductor Value
Available in 14-pin SO Package
The LTC
®
1265 is a monolithic step-down current mode
DC/DC converter featuring Burst Mode
TM
operation at low
output current. The LTC1265 incorporates a 0.3Ω switch
(V
IN
=10V) allowing up to 1.2A of output current.
Under no load condition, the converter draws only 160µA.
In shutdown it typically draws a mere 5µA making this
converter ideal for current sensitive applications. In drop-
out the internal P-channel MOSFET switch is turned on
continuously maximizing the life of the battery source. The
LTC1265 incorporates automatic power saving Burst Mode
operation to reduce gate charge losses when the load
currents drop below the level required for continuous
operation.
The inductor current is user-programmable via an external
current sense resistor. Operation up to 700kHz permits
the use of small surface mount inductors and capacitors.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.
APPLICATIO S
s
s
s
s
s
s
s
s
5V to 3.3V Conversion
Distributed Power Systems
Step-Down Converters
Inverting Converters
Memory Backup Supply
Portable Instruments
Battery-Powered Equipment
Cellular Telephones
TYPICAL APPLICATIO
V
IN
5.4V TO
12V
+
C
IN
†††
68µF
20V
0.1µF
PWR V
IN
SHDN
V
IN
SW
L1*
33µH
D1
†
R
SENSE
**
0.1Ω
1k
LTC1265-5
I
TH
C
T
PGND
SENSE
+
V
OUT
5V
1A
EFFICIENCY (%)
+
C
OUT
††
220µF
10V
3900pF
130pF
1000pF
SENSE
–
SGND
* COILTRONICS CTX33-4
** IRC LRC2010-01-R100-J
†
MBRS130LT3
††
AVX TPSE227K010
†††
AVX TPSE686K020
LTC1265-FO1
Figure 1. High Efficiency Step-Down Converter
U
LTC1265-5 Efficiency
100
95
90
V
IN
= 12V
85
80
75
70
0.01
L = 33µH
V
OUT
= 5V
R
SENSE
= 0.1Ω
C
T
= 130pF
0.10
LOAD CURRENT (A)
1.00
LTC1265 TA01
U
U
V
IN
= 6V
V
IN
= 9V
1

LTC1265CS-3.3#PBF Related Products

LTC1265CS-3.3#PBF LTC1265CS#PBF LTC1265CS#TRPBF LTC1265CS-3.3#TRPBF LTC1265CS-5#PBF LTC1265CS-5#TRPBF LTC1265CS-5 LTC1265IS#PBF LTC1265IS#TRPBF LTC1265IS
Description Conv DC-DC -0.3V to 13V Step Down Single-Out 3.3V 1.2A 14-Pin SOIC N Tube Conv DC-DC -0.3V to 13V Step Down Single-Out 1.25V to 13V 1.2A 14-Pin SOIC N Tube Conv DC-DC -0.3V to 13V Step Down Single-Out 1.25V to 13V 1.2A 14-Pin SOIC N T/R Conv DC-DC -0.3V to 13V Step Down Single-Out 3.3V 1.2A 14-Pin SOIC N T/R Conv DC-DC -0.3V to 13V Step Down Single-Out 5V 1.2A 14-Pin SOIC N Tube Conv DC-DC -0.3V to 13V Step Down Single-Out 5V 1.2A 14-Pin SOIC N T/R Conv DC-DC -0.3V to 13V Step Down Single-Out 5V 1.2A 14-Pin SOIC N Conv DC-DC -0.3V to 13V Step Down Single-Out 1.25V to 13V 1.2A 14-Pin SOIC N Tube Conv DC-DC -0.3V to 13V Step Down Single-Out 1.25V to 13V 1.2A 14-Pin SOIC N T/R Conv DC-DC -0.3V to 13V Step Down Single-Out 1.25V to 13V 1.2A 14-Pin SOIC N
EU restricts the use of certain hazardous substances Compliant Compliant Compliant Compliant Compliant Compliant Not Compliant Compliant Compliant Not Compliant
ECCN (US) EAR99 EAR99 EAR99 EAR99 EAR99 EAR99 EAR99 EAR99 EAR99 EAR99
Part Status Active Active Active Active Active Active Unconfirmed Active Active Unconfirmed
Type Step Down Step Down Step Down Step Down Step Down Step Down Step Down Step Down Step Down Step Down
Output Type Fixed Adjustable Adjustable Fixed Fixed Fixed Fixed Adjustable Adjustable Adjustable
Switching Frequency (kHz) 700 700 700 700 700 700 700 700 700 700
Switching Regulator Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
Number of Outputs 1 1 1 1 1 1 1 1 1 1
Output Voltage (V) 3.3 1.25 to 13 1.25 to 13 3.3 5 5 5 1.25 to 13 1.25 to 13 1.25 to 13
Maximum Output Current (A) 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2
Minimum Input Voltage (V) -0.3 -0.3 -0.3 -0.3 -0.3 -0.3 -0.3 -0.3 -0.3 -0.3
Typical Input Voltage (V) 10 10 10 10 10 10 10 10 10 10
Maximum Input Voltage (V) 13 13 13 13 13 13 13 13 13 13
Operating Supply Voltage (V) 10 10 10 10 10 10 10 10 10 10
Line Regulation 40mV 40mV 40mV 40mV 40mV 40mV 40mV 40mV 40mV 40mV
Efficiency (%) 95 95 95 95 95 95 95 95 95 95
Maximum Operating Temperature (°C) 70 70 70 70 70 70 70 85 85 85
Supplier Temperature Grade Commercial Commercial Commercial Commercial Commercial Commercial Commercial Industrial Industrial Industrial
Pin Count 14 14 14 14 14 14 14 14 14 14
Standard Package Name SOP SOP SOP SOP SOP SOP SOP SOP SOP SOP
Supplier Package SOIC N SOIC N SOIC N SOIC N SOIC N SOIC N SOIC N SOIC N SOIC N SOIC N
Mounting Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount
Package Height 1.5(Max) 1.5(Max) 1.5(Max) 1.5(Max) 1.5(Max) 1.5(Max) 1.5(Max) 1.5(Max) 1.5(Max) 1.5(Max)
Package Length 8.74(Max) 8.74(Max) 8.74(Max) 8.74(Max) 8.74(Max) 8.74(Max) 8.74(Max) 8.74(Max) 8.74(Max) 8.74(Max)
Package Width 3.99(Max) 3.99(Max) 3.99(Max) 3.99(Max) 3.99(Max) 3.99(Max) 3.99(Max) 3.99(Max) 3.99(Max) 3.99(Max)
PCB changed 14 14 14 14 14 14 14 14 14 14
Lead Shape Gull-wing Gull-wing Gull-wing Gull-wing Gull-wing Gull-wing Gull-wing Gull-wing Gull-wing Gull-wing
HTS 8542.39.00.01 8542.39.00.01 8542.39.00.01 8542.39.00.01 8542.39.00.01 8542.39.00.01 - 8542.39.00.01 8542.39.00.01 8542.39.00.01
Packaging Tube Tube Tape and Reel Tape and Reel Tube Tape and Reel - Tube Tape and Reel -

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