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LTC3447EDD

Description
Conv DC-DC 2.5V to 5.5V Synchronous Step Down Single-Out 0.669V to 2.05V 0.6A 10-Pin DFN EP
File Size437KB,16 Pages
ManufacturerADI
Websitehttps://www.analog.com
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LTC3447EDD Overview

Conv DC-DC 2.5V to 5.5V Synchronous Step Down Single-Out 0.669V to 2.05V 0.6A 10-Pin DFN EP

LTC3447EDD Parametric

Parameter NameAttribute value
EU restricts the use of certain hazardous substancesNot Compliant
ECCN (US)EAR99
Part StatusUnconfirmed
HTS8542.39.00.01
SVHCYes
SVHC Exceeds ThresholdYes
TypeSynchronous Step Down
Output TypeAdjustable
Switching Frequency (kHz)160(Typ)
Switching RegulatorYes
Number of Outputs1
Output Voltage (V)0.669 to 2.05
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)33
Line Regulation1%/V
Load Regulation0.5%(Typ)
Efficiency (%)93
Minimum Operating Temperature (°C)-40
Maximum Operating Temperature (°C)85
Supplier Temperature GradeExtended
Pin Count10
Standard Package NameDFN
Supplier PackageDFN EP
MountingSurface Mount
Package Height0.75(Max)
Package Length3
Package Width3
PCB changed10
Lead ShapeNo Lead
LTC3447
I
2
C Controllable Buck
Regulator in 3mm
×
3mm DFN
FEATURES
DESCRIPTIO
I
2
C Programmable Output with 21.6mV Resolution
Overtemperature Protected
High Efficiency: Up to 93%
Very Low Quiescent Current: Only 33µA
600mA Output Current at V
IN
= 3V
2.5V to 5.5V Input Voltage Range
1MHz Constant Frequency Operation
No Schottky Diode Required
Low Dropout Operation: 100% Duty Cycle
Stable with Ceramic Capacitors
Shutdown Mode Draws <1µA Supply Current
±2% Output Voltage Accuracy
Standard (100kHz) or Fast Mode (400kHz) I
2
C
6-Bit Voltage DAC (0.69V to 2.05V)
Disable Burst Mode Operation
Enable Power Good Blanking
Optional External Start-Up Resistors
Soft-Start
10 Lead, 3mm × 3mm DFN Package
The LTC
®
3447 is a high efficiency monolithic synchronous
current mode buck regulator. Using an I
2
C interface, the
output voltage can be set between 0.69V and 2.05V using
an internal 6-bit DAC.
The buck regulator has optional external feedback resis-
tors that can be used for setting the initial start up voltage.
The feedback voltage reference for this start-up option
is 0.6V. Once the voltage DAC is updated via the I
2
C, the
buck regulator switches from external to internal feedback
resistors. When there are no external resistors, the default
start-up voltage is 1.38V.
The switching frequency is internally set at 1MHz, al-
lowing the use of small surface mount inductors and
capacitors.
In Burst Mode
®
operation, supply current is only 33µA,
dropping to <1µA in shutdown. The 2.5V to 5.5V input
voltage range makes the LTC3447 ideally suited for single
cell Li-Ion battery-powered applications. 100% duty cycle
capability provides low dropout operation, extending
battery life in portable systems. Automatic Burst Mode
operation increases efficiency at light loads, further ex-
tending battery life.
The internal synchronous switch increases efficiency and
eliminates the need for an external Schottky diode.
APPLICATIO S
Distributed Power Supplies
Notebook Computers
PDAs and Other Handheld Devices
, LTC and LT 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.
TYPICAL APPLICATIO
V
IN
2.5V TO 5.5V
C2
4.7µF
CERAMIC
V
IN
Efficiency and Power Loss vs
Load Current (V
IN
= 3.6V)
100
V
IN
RPU1
20k
90
80
EFFICIENCY (%)
70
60
50
40
30
20
R2
49.9k
I
2
C
V
CCD
PWREN
10k
SDA
SCL
10k
C3
4.7µF
PGOOD
LTC3447
SW
V
CCD
RUN
SDA
SCL
GND
V
OUT
FB
L1
3.3µH
C1
10µF
R1
100k
V
OUT
0.69V
TO 2.05V
AT 600mA*
10
0
1
* 600mA AT V
IN
= 3V
EXPOSED PADDLE
TO GROUND
3447 TA01
U
1000
POWER LOSS (mW)
100
10
PULSE SKIP EFFICIENCY
Burst Mode EFFICIENCY
LOSS
10
100
LOAD CURRENT (mA)
1
1000
3447f
3447 TA01b
U
U
1

LTC3447EDD Related Products

LTC3447EDD LTC3447EDD#PBF LTC3447EDD#TRPBF
Description Conv DC-DC 2.5V to 5.5V Synchronous Step Down Single-Out 0.669V to 2.05V 0.6A 10-Pin DFN EP Conv DC-DC 2.5V to 5.5V Synchronous Step Down Single-Out 0.669V to 2.05V 0.6A 10-Pin DFN EP Tube Conv DC-DC 2.5V to 5.5V Synchronous Step Down Single-Out 0.669V to 2.05V 0.6A 10-Pin DFN EP T/R
EU restricts the use of certain hazardous substances Not Compliant Compliant Compliant
ECCN (US) EAR99 EAR99 EAR99
Part Status Unconfirmed Active Active
HTS 8542.39.00.01 8542.39.00.01 8542.39.00.01
Type Synchronous Step Down Synchronous Step Down Synchronous Step Down
Output Type Adjustable Adjustable Adjustable
Switching Frequency (kHz) 160(Typ) 160(Typ) 160(Typ)
Switching Regulator Yes Yes Yes
Number of Outputs 1 1 1
Output Voltage (V) 0.669 to 2.05 0.669 to 2.05 0.669 to 2.05
Maximum Output Current (A) 0.6 0.6 0.6
Minimum Input Voltage (V) 2.5 2.5 2.5
Maximum Input Voltage (V) 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
Typical Quiescent Current (uA) 33 33 33
Line Regulation 1%/V 1%/V 1%/V
Load Regulation 0.5%(Typ) 0.5%(Typ) 0.5%(Typ)
Efficiency (%) 93 93 93
Minimum Operating Temperature (°C) -40 -40 -40
Maximum Operating Temperature (°C) 85 85 85
Supplier Temperature Grade Extended Extended Extended
Pin Count 10 10 10
Standard Package Name DFN DFN DFN
Supplier Package DFN EP DFN EP DFN EP
Mounting Surface Mount Surface Mount Surface Mount
Package Height 0.75(Max) 0.75(Max) 0.75(Max)
Package Length 3 3 3
Package Width 3 3 3
PCB changed 10 10 10
Lead Shape No Lead No Lead No Lead
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