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LTC3459ES6#TRMPBF

P1-P3P4-P6P7-P9P10-P12
LTC3459
1
3459fc
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
10V Micropower
Synchronous Boost Converter
The LTC
®
3459 is a low current, high effi ciency synchronous
boost converter intended for low power, size constrained
portable applications. The LTC3459 can be powered from
a single lithium ion battery, a 2- to 3-cell stack of alkaline
or nickel batteries, or any low impedance voltage source
between 1.5V and 5.5V. The output is programmable via
an external divider between 2.5V and 10V. Although the
part is primarily intended for boost applications, V
OUT
will
maintain regulation below V
IN
(at reduced effi ciency).
The LTC3459 offers Burst Mode operation with a fi xed
peak current, providing high conversion effi ciency over
a wide range of load currents. During start-up, inductor
current is controlled preventing the inrush surge current
found in many boost converters. In shutdown the output
is disconnected from the input and quiescent current is
reduced to <1μA.
The LTC3459 is offered in low profi le 6-pin 2mm × 2mm
DFN, 2mm × 3mm DFN or SOT-23 (ThinSOT
TM
) packages,
allowing a tiny footprint for the total solution.
5V to 8V Converter
n
Small Solution Size
n
>85% Effi ciency over Wide Load Range
n
Internal Synchronous Rectifi er
n
V
IN
Range: 1.5V to 5.5V
n
5V at 30mA from 3.3V Input
n
3.3V at 20mA from 2 AA Cell Input
n
Programmable Output Voltages Up to 10V
n
Burst Mode
®
Operation
n
Inrush Current Limiting
n
Output Disconnect in Shutdown
n
Ultralow Quiescent (10μA) and Shutdown (<1μA)
Currents
n
Low Profi le 2mm × 2mm DFN, 2mm × 3mm DFN or
SOT-23 Package
n
General Purpose Micropower Boost
n
Digital Cameras
n
PDAs
n
LCD Bias
n
Small OLED Displays
n
Supercap Charging
, LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology
Corporation. ThinSOT is a trademark of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
Effi ciency
SW
22
μH
V
IN
2M 47pF
V
OUT
8V
30mA
4.7
μF
1μF
5V
LTC3459
SHDN
V
OUT
FBOFF ON
GND
365k
3459 TA01a
I
LOAD
(mA)
60
EFFICIENCY (%)
70
80
90
100
0.01 1 10 100
3459 TA01b
50
0.1
V
IN
= 5V
V
OUT
= 8V
LTC3459
2
3459fc
ABSOLUTE MAXIMUM RATINGS
V
IN
, FB Voltage ........................................... –0.3V to 7V
V
OUT
, SHDN Voltage ................................. –0.3V to 10V
SW Voltage .............................................. –0.3V to 12V
Operating Temperature Range
(Notes 2, 3) ......................................... –40°C to 85°C
Referred to GND (Note 1)
TOP VIEW
SW
FB
V
IN
V
OUT
SHDN
DC PACKAGE
6-LEAD (2mm s 2mm) PLASTIC DFN
4
5
7
6
3
2
1
GND
T
JMAX
= 125°C, θ
JA
= 102°C/W
EXPOSED PAD (PIN 7) IS GND, MUST BE SOLDERED TO PCB
TOP VIEW
V
IN
GND
SW
S
HDN
V
OUT
FB
DCB PACKAGE
6-LEAD (2mm × 3mm) PLASTIC DFN
4
5
7
6
3
2
1
T
JMAX
= 125°C, θ
JA
= 64°C/W
EXPOSED PAD (PIN 7) IS GND, MUST BE SOLDERED TO PCB
SW 1
GND 2
FB 3
6V
IN
5V
OUT
4 SHDN
TOP VIEW
S6 PACKAGE
6-LEAD PLASTIC TSOT-23
T
JMAX
= 125°C, θ
JA
= 192°C/W
PIN CONFIGURATION
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3459EDC#PBF LTC3459EDC#TRPBF LDTG
Low Profi le (2mm × 2mm) Plastic DFN
–40°C to 85°C
LTC3459EDCB#PBF LTC3459EDCB#TRPBF LDMM
Low Profi le (2mm × 3mm) Plastic DFN
–40°C to 85°C
LTC3459ES6#PBF LTC3459ES6#TRPBF LTAHA Low Profi le SOT-23 –40°C to 85°C
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based fi nish parts.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifi cations, go to:
http://www.linear.com/tapeandreel/
Storage Temperature Range .................. –65°C to 150°C
Refl ow Temperature .............................................. 260°C
Lead Temperature, S6 Package
(Soldering, 10 sec) .......................................... 300°C
LTC3459
3
3459fc
ELECTRICAL CHARACTERISTICS
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LTC3459E is guaranteed to meet performance specifi cations
from 0°C to 85°C. Specifi cations over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Input Voltage Range
l
1.5 5.5 V
V
IN
Quiescent Current SHDN = V
CC
10 20 μA
V
IN
Shutdown Current SHDN = GND 0.1 1 μA
V
OUT
Programmable Voltage Range
l
2.5 10 V
V
OUT
Quiescent Supply Current SHDN = V
CC
24 μA
V
OUT
Shutdown Current SHDN = GND 0.1 1 μA
Reference
Feedback Voltage V
IN
= 3.3V, V
OUT
= 7.5V
l
1.19 1.22 1.25 V
FB Input Leakage Current Measured on FB 10 50 nA
Converter Performance
Peak Switch Current (V
IN
= 3.3V) L = 22μH
l
60 75 90 mA
t
OFF
Timer (V
IN
= 3.3V, V
OUT
= 5V) Varies by 1/(V
OUT
– V
IN
) 225 400 550 ns
Zero Current Comparator Threshold L = 22μH 0 mA
Main NMOS Switch
On-Resistance V
OUT
= 5V 2.8 Ω
Leakage Current V
SWITCH
= 10V, V
OUT
= 10V 0.01 1 μA
Main PMOS Switch
On-Resistance V
OUT
= 5V 4.2 Ω
Leakage Current V
IN
= 5V, V
SWITCH
= 5V, V
OUT
= 0V 0.02 2 μA
Logic Inputs
SHDN Threshold (Rising Edge) 0.3 1 V
SHDN Hysteresis 80 mV
SHDN Input Leakage Current SHDN = 3.3V 0 50 nA
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
IN
= 3.3V, V
OUT
= 5V, unless otherwise noted.
Note 3: This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specifi ed maximum operating junction
temperature may impair device reliability.
P1-P3P4-P6P7-P9P10-P12

LTC3459ES6#TRMPBF

Mfr. #:
Buy LTC3459ES6#TRMPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 75mA Sync Boost Converter w/out Disconnect
Lifecycle:
New from this manufacturer.
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