EEWORLDEEWORLDEEWORLD

Part Number

Search

LTC3549EDCB#TRPBF

Description
Conv DC-DC 1.6V to 5.5V Synchronous Step Down Single-Out 0.611V to 5.5V 0.25A 6-Pin DFN EP T/R
File Size341KB,16 Pages
ManufacturerADI
Websitehttps://www.analog.com
Download Datasheet Parametric Compare View All

LTC3549EDCB#TRPBF Overview

Conv DC-DC 1.6V to 5.5V Synchronous Step Down Single-Out 0.611V to 5.5V 0.25A 6-Pin DFN EP T/R

LTC3549EDCB#TRPBF Parametric

Parameter NameAttribute value
EU restricts the use of certain hazardous substancesCompliant
ECCN (US)EAR99
Part StatusActive
HTS8542.39.00.01
TypeSynchronous Step Down
Output TypeAdjustable
Switching Frequency (kHz)2700
Switching RegulatorYes
Number of Outputs1
Output Voltage (V)0.611 to 5.5
Maximum Output Current (A)0.25
Minimum Input Voltage (V)1.6
Maximum Input Voltage (V)5.5
Operating Supply Voltage (V)1.6 to 5.5
Line Regulation0.4%/V
Load Regulation0.5%(Typ)
Efficiency (%)93
Minimum Operating Temperature (°C)-40
Maximum Operating Temperature (°C)85
Supplier Temperature GradeExtended
PackagingTape and Reel
Pin Count6
Standard Package NameDFN
Supplier PackageDFN EP
MountingSurface Mount
Package Height0.75(Max)
Package Length2
Package Width3
PCB changed6
Lead ShapeNo Lead
LTC3549
250mA Low V
IN
Buck
Regulator in 2mm
×
3mm DFN
FEATURES
DESCRIPTIO
1.6V to 5.5V Input Voltage Range
Internal Soft-Start
Low Ripple Burst Mode
®
Operation
Output Ripple: <20mV
P-P
I
Q
: 50µA
2.25MHz Constant-Frequency Operation
High Efficiency: Up to 93%
250mA Output Current (V
IN
= 1.8V, V
OUT
= 1.2V)
450mA Peak Inductor Current
No Schottky Diode Required
Low Dropout Operation: 100% Duty Cycle
0.611V Reference Voltage
Stable with Ceramic Capacitors
Shutdown Mode Draws <1µA Supply Current
Current Mode Operation for Excellent Line and Load
Transient Response
Overtemperature Protection
Available in a Low Profile (0.75mm) 6-Lead
(2mm x 3mm) DFN Package
The LTC
®
3549 is a high efficiency, monolithic synchronous
buck regulator using a constant-frequency, current mode
architecture. The output voltage is adjusted via an external
resistor divider.
A fixed switching frequency of 2.25MHz is supported.
This switching frequency allows the use of small surface
mount inductors and capacitors, including ceramics.
Supply current during Burst Mode operation is only 50µA
dropping to < 1µA in shutdown. The 1.6V to 5.5V input
voltage range makes the LTC3549 ideally suited for single
cell Li-Ion, Li-Metal and 2-cell alkaline, NiCd or NiMH
battery-powered applications. 100% duty cycle capabil-
ity provides low dropout operation, extending battery
life in portable systems. Burst Mode operation can be
user-enabled, increasing efficiency at light loads, further
extending battery life.
The internal synchronous switch increases efficiency and
eliminates the need for an external Schottky diode. Internal
soft-start offers controlled output voltage rise time at start-
up without the need for external components.
, 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. Protected by U.S. Patents,
including 5481178, 6580258, 6304066, 6127815, 6498466, 6611131.
APPLICATIO S
2 AA-Cell Applications
Cellular Phones
Digital Cameras
MP3 Players
TYPICAL APPLICATIO
Burst Mode Efficiency, V
OUT
= 1.5V
100
1
90
80
0.1
POWER LOSS (W)
High Efficiency Step-Down Converter
LTC3549
SW
4.7µF
CER
V
IN
RUN
MODE
V
FB
GND
*TDK VLF3012AT-3R3MR87
3549 TA01
3.3µH*
22pF
V
IN
1.8V TO
5.5V
EFFICIENCY (%)
V
OUT
1.5V
4.7µF
CER
70
60
50
40
30
20
10
0
0.1
137k 200k
U
0.01
V
IN
= 1.8V
0.001
V
IN
= 2.5V
V
IN
= 3.1V
POWER LOST
AT V
IN
= 2.5V
0.0001
10
100
1k
1
LOAD CURRENT (mA)
3549 TA02
3549f
U
U
1

LTC3549EDCB#TRPBF Related Products

LTC3549EDCB#TRPBF LTC3549EDCB#PBF LTC3549EDCB#TRM LTC3549EDCB#TRMPBF
Description Conv DC-DC 1.6V to 5.5V Synchronous Step Down Single-Out 0.611V to 5.5V 0.25A 6-Pin DFN EP T/R Conv DC-DC 1.6V to 5.5V Synchronous Step Down Single-Out 0.611V to 5.5V 0.25A 6-Pin DFN EP T/R Conv DC-DC 1.6V to 5.5V Synchronous Step Down Single-Out 0.611V to 5.5V 0.25A 6-Pin DFN EP T/R Conv DC-DC 1.6V to 5.5V Synchronous Step Down Single-Out 0.611V to 5.5V 0.25A 6-Pin DFN EP T/R
EU restricts the use of certain hazardous substances Compliant Compliant Compliant Compliant
ECCN (US) EAR99 EAR99 EAR99 EAR99
Part Status Active Unconfirmed Active Active
Type Synchronous Step Down Synchronous Step Down Synchronous Step Down Synchronous Step Down
Output Type Adjustable Adjustable Adjustable Adjustable
Switching Frequency (kHz) 2700 2700 2700 2700
Switching Regulator Yes Yes Yes Yes
Number of Outputs 1 1 1 1
Output Voltage (V) 0.611 to 5.5 0.611 to 5.5 0.611 to 5.5 0.611 to 5.5
Maximum Output Current (A) 0.25 0.25 0.25 0.25
Minimum Input Voltage (V) 1.6 1.6 1.6 1.6
Maximum Input Voltage (V) 5.5 5.5 5.5 5.5
Operating Supply Voltage (V) 1.6 to 5.5 1.6 to 5.5 1.6 to 5.5 1.6 to 5.5
Line Regulation 0.4%/V 0.4%/V 0.4%/V 0.4%/V
Load Regulation 0.5%(Typ) 0.5%(Typ) 0.5%(Typ) 0.5%(Typ)
Efficiency (%) 93 93 93 93
Minimum Operating Temperature (°C) -40 -40 -40 -40
Maximum Operating Temperature (°C) 85 85 85 85
Supplier Temperature Grade Extended Extended Extended Extended
Packaging Tape and Reel Tape and Reel Tape and Reel Tape and Reel
Pin Count 6 6 6 6
Standard Package Name DFN DFN DFN DFN
Supplier Package DFN EP DFN EP DFN EP DFN EP
Mounting Surface Mount Surface Mount Surface Mount Surface Mount
Package Height 0.75(Max) 0.75(Max) 0.75(Max) 0.75(Max)
Package Length 2 2 2 2
Package Width 3 3 3 3
PCB changed 6 6 6 6
Lead Shape No Lead No Lead No Lead No Lead
Why is the voltage range of the BUCK circuit always 0-7.2V?
I soldered a simple buck circuit, the power supply is 15V, the capacitor is 280UH, the voltage is 1000uf, the load is 50 ohms, the duty cycle is 97%, the power supply is 15V, but the voltage across th...
jharden Power technology
Phase-locked frequency multiplication design of CD4046
I want to multiply the industrial frequency by 256. I would like to ask whether the center frequency of CD4046 refers to the industrial frequency or the frequency after multiplication. How should the ...
xzyxtt Analogue and Mixed Signal
2440 I2S AD conversion problem
Can I use the I2S audio decoder chip to perform ADC conversion and then send it back to the 2440 processor through the I2S interface? How to do it? The audio chip AK4554 has its own I2S interface and ...
katrina Embedded System
How to modify the IP address of WINCE in EVC?
I followed the methods on the Internet to modify the IP address, but it always fails. Although the program is executed successfully and the registry key is added, why does it always fail? The method I...
zxfen12 Embedded System
How does circuit design determine the resistance value of the current limiting resistor?
Dear experts, when designing circuit schematics, two integrated chips are often connected with resistors in series rather than directly connected. How do you determine the resistance value of these cu...
oceanwangchao Embedded System
Why doesn’t the new Xiaomi use QC4 low-voltage fast charging?
[size=4]The latest version of Xiaomi Mi 6 is officially released. QuickCharge is a fast charging technology led by Qualcomm, and has now developed to the latest QC4.0 version. [/size] [size=4] [/size]...
qwqwqw2088 Analogue and Mixed Signal

EEWorld
subscription
account

EEWorld
service
account

Automotive
development
circle

Robot
development
community

Index Files: 1200  1036  2604  2476  2904  25  21  53  50  59 
Datasheet   0 1 2 3 4 5 6 7 8 9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Room 1530, 15th Floor, Building B, No. 18 Zhongguancun Street, Haidian District, Beijing Telephone: (010) 82350740 Postal Code: 100190
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved 京ICP证060456号 京ICP备10001474号-1 电信业务审批[2006]字第258号函 京公网安备 11010802033920号