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LTC3549EDCB#TRM

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
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LTC3549EDCB#TRM 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#TRM 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

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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
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