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參數(shù)資料
| 型號： | LTC3563EDC#TR |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.75 A SWITCHING REGULATOR, 2700 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封裝： | 2 X 2 MM, PLASTIC, MO-229WCCD-2, DFN-6 |
| 文件頁數(shù)： | 1/16頁 |
| 文件大?。?/td> | 276K |
| 代理商： | LTC3563EDC#TR |
LTC3563
1
3563f
500mA, Synchronous
Step-Down DC/DC Converter
with Selectable Output Voltage
The LTC
3563 is a high efciency monolithic synchro-
nous buck converter using a constant frequency, current
mode architecture. A voltage select input allows the user
to program the output voltage to 1.28V or 1.87V. Supply
current during operation is only 26A, dropping to <1A in
shutdown. The 2.5V to 5.5V input voltage range makes the
LTC3563 ideally suited for single Li-Ion battery-powered
applications. 100% duty cycle provides low dropout opera-
tion, extending battery life in portable systems. Internal
power switches are optimized to provide high efciency
and eliminate the need for an external Schottky diode.
The switching frequency is internally set at 2.25MHz,
allowing the use of small surface mount inductors and
capacitors. The LTC3563 is specically designed to work
well with ceramic output capacitors, achieving very low
output voltage ripple and a small PCB footprint.
The LTC3563 is congured for the power saving Burst
Mode Operation.
■
Cellular Telephones
■
Wireless and DSL Modems
■
Digital Cameras
■
MP3 Players
■
PDAs and Other Handheld Devices
■
High Efciency: Up to 96%
■
Pin Selectable Output Voltage: 1.28V/1.87V
■
Low Ripple (<20mVP-P) Burst Mode
Operation:
IQ = 26A
■
Very Low Quiescent Current: Only 26A
■
2.5V to 5.5V Input Voltage Range
■
2.25MHz Constant Frequency Operation
■
Low Dropout Operation: 100% Duty Cycle
■
No Schottky Diode Required
■
Internal Soft-Start Limits Inrush Current
■
Shutdown Mode Draws <1A Supply Current
■
±2% Output Voltage Accuracy
■
Current Mode Operation for Excellent Line and Load
Transient Response
■
Overtemperature Protected
■
Available in 2mm × 2mm 6-Lead DFN
APPLICATIO S
U
FEATURES
DESCRIPTIO
U
TYPICAL APPLICATIO
U
, LTC, LT, LTM and Burst Mode are registered trademarks of Linear Technology
Corporation. All other trademarks are the property of their respective owners.
Protected by U.S. Patents, including 5481178, 6580258, 6304066, 6127815, 6498466,
6611131, 5994885.
VIN
LTC3563
RUN
3563 TA01a
2.2
H
CIN
10
F
CER
COUT
10
F
CER
SW
VIN
2.7V TO 5.5V
VOUT
1.28V/1.87V
500mA
VOUT
VSEL
GND
1.28V 1.87V
Efciency and Power Loss vs Output Current
OUTPUT CURRENT (mA)
30
EFFICIENCY
(%)
POWER
LOSS
(mW)
90
100
20
10
80
50
70
60
40
0.1
10
100
1000
3563 TA01b
0
100
1000
10
1
0.1
1
VIN = 3.6V
VOUT = 1.87V
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