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LTC3458L Datasheet

  • LTC3458L

  • 1.7A, 1.5MHz Synchronous Step-Up DC/DC Converter with Output...

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LTC3458L
1.7A, 1.5MHz Synchronous
Step-Up DC/DC Converter
with Output Disconnect
DESCRIPTIO
The LTC
廬
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 0.2鈩?N-channel
MOSFET switch and a 0.3鈩?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 12碌A(chǔ) 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
<1碌A(chǔ) shutdown current, antiringing control, and thermal
limit. The LTC3458L is available in a low profile (0.75mm),
4mm
脳
3mm 12-pin DFN package.
, 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, 6304066, 6580258, 5511131, 6498466
FEATURES
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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
廬
Operation
Current Mode Control with Programmable Soft-Start
Period and Peak Current Limit
0.2鈩?N-Channel and 0.3鈩?P-Channel Switches
Ultralow Quiescent Currents: 12碌A(chǔ) Sleep, <1碌A(chǔ) in
Shutdown
12-Pin 4mm
脳
3mm Thermally Enhanced DFN
Package
APPLICATIO S
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Point-of-Load Regulators
USB V
BUS
Power
Portable GPS
MP3 Players
TYPICAL APPLICATIO
7.4碌H
Li-Ion to 5V at 1MHz
Li-Ion to 5V
OUT
Li Ion
3.1V TO 4.2V
V
IN
2.2碌F
LTC3458L
GND/PGND
SHDN
SYNC
R
T
I
LIM
200k
84.5k
V
OUT
10pF
ON OFF
FB
COMP
0.01碌F
SS
0.01碌F
BURST
133k
560pF
3458L TA01a
SW
V
OUT
5V
750mA
1M
EFFICIENCY (%)
100
95
90
85
80
75
70
22碌F
X5R
324k
33k
10pF
65
60
0.1
1
100
10
LOAD CURRENT (mA)
0.1
1000
3458L TA01b
U
U
U
1000
4.2V
IN
3.6 V
IN
POWER LOSS (mW)
3.1V
IN
3.6V
IN
100
10
POWER
LOSS
1
3458lf
1

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