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LT1944 Datasheet

  • LT1944

  • 1.4A, 1.5MHz Synchronous Step-Up DC/DC Converter with Output...

  • 339.81KB

  • 16頁

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LTC3458
1.4A, 1.5MHz Synchronous
Step-Up DC/DC Converter
with Output Disconnect
DESCRIPTIO
The LTC
廬
3458 is a high efficiency, current mode, fixed
frequency, step up DC/DC converter with true output
disconnect and inrush current limiting. The LTC3458 is
rated for a 7.5V output and includes a 0.3鈩?N-channel
MOSFET switch and a 0.4鈩?P-channel MOSFET synchro-
nous rectifier. The LTC3458 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 15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 LTC3458 is available in a low profile (0.75mm),
3mm
脳
4mm 12-pin DFN package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation.
FEATURES
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High Efficiency: Up to 93%
Inrush Current Limiting and Output Disconnect
Programmable Output Voltages up to 7.5V
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
700mA at 7V from 5V Input
0.3鈩?N-Channel and 0.4鈩?P-Channel 1.4A Switches
at 5V
OUT
Ultralow Quiescent Currents: 15碌A(chǔ) Sleep, <1碌A(chǔ) in
Shutdown
3mm
脳
4mm Thermally Enhanced DFN Package
Point-of-Load Regulators
USB V
BUS
Power
LCD Bias
OLED Displays
APPLICATIO S
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TYPICAL APPLICATIO
COEV
10碌H
DQ7545
USB to 7V at 1MHz
USB to 7V
OUT
100
V
IN
2.2碌F
LTC3458
GND/PGND
SHDN
SYNC
R
T
I
LIM
200k
124k
V
OUT
10pF
ON OFF
FB
COMP
0.01碌F
SS
0.01碌F
BURST
133k
560pF
3458 TA01a
SW
V
OUT
7V
500mA
1.5M
USB
4.35V to 5.25V
EFFICIENCY
316k
33k
10pF
22碌F
X5R
75
70
0.1
0.1
1000
3458 TA01b
U
U
U
1000
95
90
85
5.25V
IN
POWER LOSS (mW)
4.35V
IN
10
POWER LOSS
80
1
10
100
LOAD CURRENT (mA)
3458f
1

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