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LTC3458LEDE#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
LTC3458L
1
3458lfa
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATIO
U
■
High Efficiency: Up to 95%
■
Inrush Current Limiting and Output Disconnect
■
Programmable Output Voltages up to 6V
■
1.5V to 6V Input Range
■
Programmable/Synchronizable Fixed Frequency
Operation up to 1.5MHz
■
Programmable Automatic Burst Mode
®
Operation
■
Current Mode Control with Programmable Soft-Start
Period and Peak Current Limit
■
0.2Ω N-Channel and 0.3Ω P-Channel Switches
■
Ultralow Quiescent Currents: 12μA Sleep, <1μA in
Shutdown
■
12-Pin 4mm × 3mm Thermally Enhanced DFN
Package
■
Point-of-Load Regulators
■
USB V
BUS
Power
■
Portable GPS
■
MP3 Players
1.7A, 1.5MHz Synchronous
Step-Up DC/DC Converter
with Output Disconnect
The LTC
®
3458L is a high efficiency, current mode, fixed
frequency, step up DC/DC converter with true output
disconnect and inrush current limiting. The LTC3458L is
rated for up to 6V output and includes a 0.2Ω N-channel
MOSFET switch and a 0.3Ω P-channel MOSFET synchro-
nous rectifier. The LTC3458L is well suited for battery
powered applications and includes programmable output
voltage, switching frequency and loop compensation. The
oscillator frequency can be set up to 1.5MHz or synchro-
nized to an external clock.
Quiescent current is only 12μA during Burst Mode opera-
tion maximizing battery life in portable applications. The
Burst Mode current threshold, peak current limit, and soft-
start are externally programmable. Other features include
<1μA shutdown current, antiringing control, and thermal
limit. The LTC3458L is available in a low profile (0.75mm),
4mm × 3mm 12-pin DFN package.
Li-Ion to 5V at 1MHz
Li-Ion to 5V
OUT
V
IN
GND/PGND
SHDN
SYNC
R
T
I
LIM
SW
V
OUT
FB
COMP
SS
BURST
LTC3458L
Li Ion
3.1V TO 4.2V
2.2μF
7.4μH
ON OFF
200k 84.5k 133k
324k
33k
0.01μF
0.01μF
560pF
10pF
10pF
1M
22μF
X5R
V
OUT
5V
750mA
3458L TA01a
LOAD CURRENT (mA)
0.1
EFFICIENCY (%)
3.6 V
IN
POWER LOSS (mW)
100
95
90
85
80
75
70
65
60
1000
100
10
1
0.1
110
3458L TA01b
100 1000
4.2V
IN
3.1V
IN
POWER
LOSS
3.6V
IN
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All
other trademarks are the property of their respective owners. Burst Mode is a registered
trademark of Linear Technology Corporation. Protected by U.S. Patents including 5481178,
6580258, 6304066, 6127815, 6498466, 6611131.
LTC3458L
2
3458lfa
V
IN
, SS, SYNC Voltages ................................. –0.3 to 7V
BURST, SHDN, V
OUT
Voltages ....................... –0.3 to 7V
Operating Temperature Range
(Notes 2, 3) .........................................–40°C to 85°C
Storage Temperature Range ..................–65°C to 125°C
SW Voltage
DC ........................................................... –0.3V to 7V
Pulsed <100ns ........................................ –0.3V to 8V
ABSOLUTE AXI U RATI GS
W
WW
U
(Note 1)
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 3.3V, V
OUT
= 5V, R
T
= 200k, unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum V
IN
Operating Voltage T
A
= 0°C to 85°C 1.4 1.5 V
T
A
= –40°C to 0°C 1.4 1.7 V
Output Voltage Adjust Range ● 26V
Feedback Voltage 0°C to 85°C, V
OUT
= 3.3V 1.21 1.225 1.25 V
–40°C to 0°C 1.20 1.25 V
Undervoltage (Exit Burst Mode Operation) Below Feedback Voltage –4 %
Feedback Input Current V
FB
= 1.23V 1 50 nA
Quiescent Current – Burst Mode Operation V
IN
Current at 3.3V 12 30 μA
V
OUT
Current at 5V 5 10 μA
Quiescent Current – Shutdown V
IN
Current at 3.3V 0.5 1 μA
V
OUT
Current at 0V 1 3 μA
Quiescent Current – Active V
IN
Current Switching 1 3 mA
NMOS Switch Leakage ● 0.05 5 μA
PMOS Switch Leakage ● 0.05 5 μA
NMOS Switch On Resistance V
OUT
= 5V 0.2 Ω
PMOS Switch On Resistance V
OUT
= 5V 0.3 Ω
Fixed NMOS Current Limit R
ILIM
= 84.5k ● 1.7 2.1 A
Maximum Duty Cycle V
IN
= 3.3V, f
OSC
= 1MHz ● 80 90 %
Minimum Duty Cycle ● 0%
Frequency Accuracy R
T
= 200k ● 0.85 1 1.15 MHz
Error Amplifier Transconductance 60 μA/V
Error Amplifier Source Current 7 μA
T
JMAX
= 125°C, θ
JA
= 45°C/W
12
11
10
9
8
7
1
2
3
4
5
6
V
OUT
BURST
SS
GND
COMP
FB
SW
V
IN
SYNC
SHDN
I
LIM
R
T
TOP VIEW
DE PACKAGE
12-LEAD (4mm × 3mm) PLASTIC DFN
EXPOSED PAD IS PGND (PIN 13),
MUST BE SOLDERED TO PCB
13
PIN CONFIGURATION
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3458LEDE#PBF LTC3458LEDE#TRPBF 3458L 12-Lead (4mm x 3mm) Plastic DFN –40ºC to 85ºC
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC for information on nonstandard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
LTC3458L
3
3458lfa
PARAMETER CONDITIONS MIN TYP MAX UNITS
Error Amplifier Sink Current 7 μA
SYNC Input High ● 1.5 V
SYNC Input Low ● 0.35 V
SHDN Input High ● 1.25 V
SHDN Input Low ● 0.3 V
BURST Mode Peak Current (I
BURSTPEAK
)R
ILIM
= 84.5k 0.55 A
BURST Threshold Voltage 1.10 V
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 3.3V, V
OUT
= 5V, R
T
= 200k, unless otherwise noted.
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: 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 specified maximum operating junction
temperature may impair device reliability.
Note 3: The LTC3458LE is guaranteed to meet performance specifications
from 0°C to 70°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
TYPICAL PERFOR A CE CHARACTERISTICS
UW
I
LIMIT
, I
BURSTPEAK
, I
ZERO
Currents
Burst Mode Quiescent Current
Maximum Load Current in Burst Oscillator Programming Resistor
Current Limit Accuracy
Typical Burst Mode Threshold and
Hysteresis vs R
BURST
(T
A
= 25°C unless otherwise specified)
TEMPERATURE (°C)TEMPERATURE (°C)V
IN
(V)
–402.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
CURRENT (μA)
10
15
60
3458L G033458L G01 3458L G02
5
0
–15
10
35
85
20
CURRENT (mA)
2200
2000
1800
1600
1400
1200
1000
800
600
400
200
0
–200
I
LIMIT
I
BURSTPEAK
I
ZERO
I
VIN
I
VOUT
V
IN
= 3.3V
V
OUT
= 5V
3458L G04
3458L G05 3458L G06
R
BURST
(kΩ)
50
CURRENT (mA)
200
300
100 150 250
160
140
120
100
80
60
40
20
0
V
IN
(V)
1.5
CURRENT (mA)
300
250
200
150
100
50
0
3.0 4.0 4.5
2.0 2.5
3.5
OSCILLATOR FREQUENCY (kHz)
400
RT (kΩ)
600
550
500
450
400
350
300
250
200
150
100
1200
600
800
1000
1400
OUT OF
BURST
INTO
BURST
3.3V
OUT
5V
OUT
R
ILIM
= 84.5k
–45
1.85
CURRENT (A)
1.95
2.15
2.25
–15
15
30 90
2.05
–30 0
45
60
75
R
ILIMIT
= 84.5k
V
OUT
= 5V
L = 7.4μH
R
LIM
= 84.5k
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

LTC3458LEDE#TRPBF

Mfr. #:
Buy LTC3458LEDE#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 1.7A, 1.5MHz Synch Boost Converter in DFN
Lifecycle:
New from this manufacturer.
Delivery:
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