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参数资料
| 型号： | LTC1911EMS8-1.5#TR |
| 厂商： | Linear Technology |
| 文件页数： | 1/12页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK 1.5V 0.25A 8MSOP |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 1.5V |
| 输入电压： | 2.7 V ~ 5.5 V |
| PWM 型： | Burst Mode? |
| 频率 - 开关： | 1.5MHz |
| 电流 - 输出： | 250mA |
| 同步整流器： | 无 |
| 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） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-MSOP |
| 其它名称： | LTC1911EMS8-1.5TR LTC1911EMS81.5TR |
LTC1911-1.5/LTC1911-1.8
Low Noise, High Efficiency,
Inductorless Step-Down
DC/DC Converter
FEATURES
DESCRIPTIO
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Low Noise Constant Frequency Operation
2.7V to 5.5V Input Voltage Range
No Inductors
Typical Efficiency 25% Higher Than LDOs
Shutdown Disconnects Load from V IN
Output Voltage: 1.8V ± 4% or 1.5V ± 4%
Output Current: 250mA
Low Operating Current: I IN = 180 μ A Typ
Low Shutdown Current: I IN = 10 μ A Typ
Oscillator Frequency: 1.5MHz
Soft-Start Limits Inrush Current at Turn On
Short-Circuit and Overtemperature Protected
Available in an 8-Pin MSOP Package
The LTC ? 1911 is a switched capacitor step-down DC/DC
converter that produces a 1.5V or 1.8V regulated output
from a 2.7V to 5.5V input. The part uses switched capaci-
tor fractional conversion to achieve high efficiency over the
entire input range. No inductors are required. Internal cir-
cuitry controls the step-down conversion ratio to optimize
efficiency as the input voltage and load conditions vary.*
Typical efficiency is over 25% higher than that of a linear
regulator.
A unique constant frequency architecture provides a low
noise regulated output as well as lower input noise than
conventional charge pump regulators. High frequency
operation (f OSC = 1.5MHz) simplifies output filtering to
APPLICATIO S
further reduce conducted noise. To optimize efficiency,
the part enters Burst Mode ? operation under light load
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Handheld Computers
Cellular Phones
Smart Card Readers
Portable Electronic Equipment
Handheld Medical Instruments
Low Power DSP Supplies
conditions.
Low operating current (180 μ A with no load, 10 μ A in
shutdown) and low external parts count (two 1 μ F flying
capacitors and two 10 μ F bypass capacitors) make the
LTC1911 ideally suited for space constrained battery-
powered applications. The part is short-circuit and
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation.
*U.S. Patent #6,438,005
TYPICAL APPLICATIO
overtemperature protected, and is available in an 8-pin
MSOP package.
Efficiency
90
Single Cell Li-Ion to 1.8V DC/DC Converter
80
100mA
250mA
LTC1911-1.8
70
1-CELL Li-Ion
2.7V TO 5.5V INPUT
1
V IN
SS/SHDN
8
60
OR
3-CELL NiMH
10 μ F*
1 μ F*
2
3
4
C2 +
C2 –
GND
V OUT
C1 +
C1 –
6
7
5
1 μ F*
V OUT = 1.8V
I OUT = 250mA
10 μ F*
1911 TA01
50
40
IDEAL LDO
*CERAMIC CAPACITOR
30
V OUT = 1.8V
2
3
4 5
6
INPUT VOLTAGE (V)
1911 G05
1911f
1
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