參數(shù)資料
型號(hào)： LTC3458LEDE
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： 1.7A, 1.5MHz Synchronous Step-Up DC/DC Converter with Output Disconnect
中文描述： 2.1 A SWITCHING REGULATOR, 1500 kHz SWITCHING FREQ-MAX, PDSO12
封裝： 4 X 3 MM, PLASTIC, MO-229-WGED, DFN-12
文件頁(yè)數(shù)： 1/16頁(yè)
文件大小： 389K
代理商： LTC3458LEDE
LTC3458L
1
3458lf
FEATURES
DESCRIPTIOU
APPLICATIU
■
Point-of-Load Regulators
■
USB V
BUS
Power
■
Portable GPS
■
MP3 Players
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
■
0.2
N-Channel and 0.3
P-Channel Switches
■
Ultralow Quiescent Currents: 12
μ
A Sleep, <1
μ
A in
Shutdown
■
12-Pin 4mm
×
3mm Thermally Enhanced DFN
Package
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 0.2
N-channel
MOSFET switch and a 0.3
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
μ
A 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
μ
A 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
7.4
μ
H
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
2.2
μ
F
ON OFF
200k
84.5k
133k
324k
33k
0.01
μ
F
0.01
μ
F
560pF
10pF
10pF
1M
22
μ
F
X5R
V
OUT
5V
750mA
3458L TA01a
LOAD CURRENT (mA)
0.1
E
3
I
100
95
90
85
80
75
70
65
60
1000
100
10
1
0.1
1
10
3458L TA01b
100
1000
4.2V
IN
3.1V
IN
POWER
LOSS
3.6V
IN
, 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
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