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LTC3448EDD#TRPBF

Description
Conv DC-DC 2.5V to 5.5V Synchronous Step Down Single-Out 0.6V to 5.2V 0.6A Automotive 8-Pin DFN EP T/R
File Size272KB,20 Pages
ManufacturerADI
Websitehttps://www.analog.com
Download Datasheet Parametric Compare View All

LTC3448EDD#TRPBF Overview

Conv DC-DC 2.5V to 5.5V Synchronous Step Down Single-Out 0.6V to 5.2V 0.6A Automotive 8-Pin DFN EP T/R

LTC3448EDD#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)1800|2700
Switching RegulatorYes
Number of Outputs1
Output Voltage (V)0.6 to 5.2
Maximum Output Current (A)0.6
Minimum Input Voltage (V)2.5
Maximum Input Voltage (V)5.5
Operating Supply Voltage (V)2.5 to 5.5
Typical Quiescent Current (uA)32
Line Regulation0.8%/V
Load Regulation0.5%/V(Typ)
Efficiency (%)96
Minimum Operating Temperature (°C)-40
Maximum Operating Temperature (°C)85
Supplier Temperature GradeExtended
PackagingTape and Reel
Pin Count8
Standard Package NameDFN
Supplier PackageDFN EP
MountingSurface Mount
Package Height0.75(Max)
Package Length3
Package Width3
PCB changed8
Lead ShapeNo Lead
LTC3448
1.5MHz/2.25MHz, 600mA
Synchronous Step-Down
Regulator with LDO Mode
DESCRIPTIO
The LTC
®
3448 is a high efficiency, monolithic, synchronous
buck regulator using a constant frequency, current mode
architecture. Supply current during operation is only 32µA
(linear regulator mode) and drops to <1µA in shutdown. The
2.5V to 5.5V input voltage range makes the LTC3448 ide-
ally suited for single Li-Ion battery-powered applications.
100% duty cycle provides low dropout operation, extend-
ing battery life in portable systems. At moderate output load
levels, PWM pulse skipping mode operation provides very
low output ripple voltage for noise sensitive applications.
The LTC3448 automatically switches into linear regulator
operation at very low load currents to maintain <5mV
P-P
output voltage ripple. Supply current in this mode is
typically 32µA. The switch to linear regulator mode occurs
at a threshold of 3mA. Linear regulator operation can be set
to on, off or automatic turn on/off.
Switching frequency is selectable at either 1.5MHz or
2.25MHz, allowing the use of small surface mount induc-
tors and capacitors.
The internal synchronous switch increases efficiency and
eliminates the need for an external Schottky diode. Low
output voltages are easily supported with the 0.6V feed-
back reference voltage. The LTC3448 is available in a low
profile 3mm
×
3mm DFN package or thermally enhanced
8-lead MSOP.
FEATURES
High Efficiency: Up to 96%
Very Low Quiescent Supply Current: 32
µ
A During
Linear Regulator Operation
600mA Output Current (Buck Converter)
Optionally Operates as Linear Regulator Below
3mA—External or Automatic ON/OFF
2.5V to 5.5V Input Voltage Range
1.5MHz or 2.25MHz Constant Frequency Operation
or External Synchronization
No Schottky Diode Required
Low Dropout Operation: 100% Duty Cycle
0.6V Reference Allows Low Output Voltages
Shutdown Mode Draws < 1µA Supply Current
Current Mode Operation for Excellent Line and
Load Transient Response
Overtemperature Protected
Low Profile (3mm
×
3mm) 8-Lead DFN and 8-Lead
MSOP Packages
APPLICATIO S
Cellular Telephones
Personal Information Appliances
Wireless and DSL Modems
Digital Still Cameras
MP3 Players
Portable Instruments
, LTC and LT are registered trademarks 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. Others pending.
TYPICAL APPLICATIO
V
IN
2.5V TO 5.5V
C
IN
4.7µF
V
IN
Efficiency and Power Loss vs Load Current
100
90
80
70
EFFICIENCY (%)
V
IN
= 3.6V
V
OUT
= 1.5V
T
A
= 25°C
1
1.5V High Efficiency Regulator with Automatic LDO Mode
2.2µH
SW
474k
C
OUT
4.7µF
V
OUT
RUN
LTC3448
MODE
V
FB
FREQ
SYNC
GND
V
OUT
1.5V
22pF
60
50
40
30
EFFICIENCY
POWER LOSS
0.01
316k
20
10
0
0.0001
3448 TA01a
U
U
U
0.1
POWER LOSS (W)
0.001
0.0001
0.001
0.01
0.1
LOAD CURRENT (A)
1
23448 TA01b
3448f
1

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Description Conv DC-DC 2.5V to 5.5V Synchronous Step Down Single-Out 0.6V to 5.2V 0.6A Automotive 8-Pin DFN EP T/R Conv DC-DC 2.5V to 5.5V Synchronous Step Down Single-Out 0.6V to 5.2V 0.6A Automotive 8-Pin DFN EP Tube Conv DC-DC 2.5V to 5.5V Synchronous Step Down Single-Out 0.6V to 5.2V 0.6A Automotive 8-Pin MSOP EP Tube Conv DC-DC 2.5V to 5.5V Synchronous Step Down Single-Out 0.6V to 5.2V 0.6A Automotive 8-Pin MSOP EP T/R
EU restricts the use of certain hazardous substances Compliant Compliant Compliant Compliant
ECCN (US) EAR99 EAR99 EAR99 EAR99
Part Status Active Active Active Active
HTS 8542.39.00.01 8542.39.00.01 8542.39.00.01 8542.39.00.01
Type Synchronous Step Down Synchronous Step Down Synchronous Step Down Synchronous Step Down
Output Type Adjustable Adjustable Adjustable Adjustable
Switching Frequency (kHz) 1800|2700 2700|1800 1800|2700 1800|2700
Switching Regulator Yes Yes Yes Yes
Number of Outputs 1 1 1 1
Output Voltage (V) 0.6 to 5.2 0.6 to 5.2 0.6 to 5.2 0.6 to 5.2
Maximum Output Current (A) 0.6 0.6 0.6 0.6
Minimum Input Voltage (V) 2.5 2.5 2.5 2.5
Maximum Input Voltage (V) 5.5 5.5 5.5 5.5
Operating Supply Voltage (V) 2.5 to 5.5 2.5 to 5.5 2.5 to 5.5 2.5 to 5.5
Typical Quiescent Current (uA) 32 32 32 32
Line Regulation 0.8%/V 0.8%/V 0.8%/V 0.8%/V
Load Regulation 0.5%/V(Typ) 0.5%/V(Typ) 0.5%/V(Typ) 0.5%/V(Typ)
Efficiency (%) 96 96 96 96
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 Tube Tube Tape and Reel
Pin Count 8 8 8 8
Standard Package Name DFN DFN SOP SOP
Supplier Package DFN EP DFN EP MSOP EP MSOP EP
Mounting Surface Mount Surface Mount Surface Mount Surface Mount
Package Height 0.75(Max) 0.75(Max) 0.86 0.86
Package Length 3 3 3 3
Package Width 3 3 3 3
PCB changed 8 8 8 8
Lead Shape No Lead No Lead Gull-wing Gull-wing
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