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| 型号： | LTC3448EMS8E#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 0.6A 8MSOP |
| 标准包装： | 50 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.6 V ~ 5.2 V |
| 输入电压： | 2.5 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1.5MHz ~ 2.25MHz |
| 电流 - 输出： | 600mA |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽）裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 8-MSOP-EP |
LTC3448
1.5MHz/2.25MHz, 600mA
Synchronous Step-Down
Regulator with LDO Mode
FEATURES
DESCRIPTIO
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High Efficiency: Up to 96%
Very Low Quiescent Supply Current: 32 μ A During
Linear Regulator Operation
600mA Output Current (Buck Converter)
Optionally Operates as Linear Regulator Below
3mA—External or Automatic ON/OFF
2.5V to 5.5V Input Voltage Range
1.5MHz or 2.25MHz Constant Frequency Operation
or External Synchronization
No Schottky Diode Required
Low Dropout Operation: 100% Duty Cycle
0.6V Reference Allows Low Output Voltages
Shutdown Mode Draws < 1 μ A Supply Current
Current Mode Operation for Excellent Line and
Load Transient Response
Overtemperature Protected
Low Profile (3mm × 3mm) 8-Lead DFN and 8-Lead
The LTC ? 3448 is a high efficiency, monolithic, synchronous
buck regulator using a constant frequency, current mode
architecture. Supply current during operation is only 32 μ A
(linear regulator mode) and drops to <1 μ A in shutdown. The
2.5V to 5.5V input voltage range makes the LTC3448 ide-
ally suited for single Li-Ion battery-powered applications.
100% duty cycle provides low dropout operation, extend-
ing battery life in portable systems. At moderate output load
levels, PWM pulse skipping mode operation provides very
low output ripple voltage for noise sensitive applications.
The LTC3448 automatically switches into linear regulator
operation at very low load currents to maintain <5mV P-P
output voltage ripple. Supply current in this mode is
typically 32 μ A. The switch to linear regulator mode occurs
at a threshold of 3mA. Linear regulator operation can be set
to on, off or automatic turn on/off.
MSOP Packages
APPLICATIO S
Switching frequency is selectable at either 1.5MHz or
2.25MHz, allowing the use of small surface mount induc-
tors and capacitors.
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Cellular Telephones
Personal Information Appliances
Wireless and DSL Modems
Digital Still Cameras
MP3 Players
Portable Instruments
The internal synchronous switch increases efficiency and
eliminates the need for an external Schottky diode. Low
output voltages are easily supported with the 0.6V feed-
back reference voltage. The LTC3448 is available in a low
profile 3mm × 3mm DFN package or thermally enhanced
8-lead MSOP.
, LTC and LT 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. Others pending.
TYPICAL APPLICATIO
Efficiency and Power Loss vs Load Current
100 1
V IN = 3.6V
V IN SW
RUN V OUT C OUT
4.7 μ F
4.7 μ F LTC3448
22pF
1.5V High Efficiency Regulator with Automatic LDO Mode
2.2 μ H
V IN V OUT
2.5V TO 5.5V 1.5V
C IN
474k
MODE
90
80
70
60
50
40
V OUT = 1.5V
T A = 25 ° C
EFFICIENCY
POWER LOSS
0.1
0.01
FREQ
SYNC
V FB
316k
30
20
0.001
GND
10
0
0.0001
3448 TA01a
0.0001
0.001
0.01 0.1
1
LOAD CURRENT (A)
23448 TA01b
3448f
1
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