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參數資料
| 型號： | LTC1911EMS8-1.5 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Low Noise, High Efficiency, Inductorless Step-Down DC/DC Converter |
| 中文描述： | SWITCHED CAPACITOR REGULATOR, 1800 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | PLASTIC, MSOP-8 |
| 文件頁數： | 1/12頁 |
| 文件大小： | 200K |
| 代理商： | LTC1911EMS8-1.5 |
1
LTC1911-1.5/LTC1911-1.8
Low Noise, High Efficiency,
Inductorless Step-Down
DC/DC Converter
sn1911 1911is
August 2002
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
further reduce conducted noise. To optimize efficiency,
the part enters Burst Mode
TM
operation under light load
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
overtemperature protected, and is available in an 8-pin
MSOP package.
I
Low Noise Constant Frequency Operation
I
2.7V to 5.5V Input Voltage Range
I
No Inductors
I
Typical Efficiency 25% Higher Than LDOs
I
Shutdown Disconnects Load from V
IN
I
Output Voltage: 1.8V
±
4% or 1.5V
±
4%
I
Output Current: 250mA
I
Low Operating Current: I
IN
= 180
μ
A Typ
I
Low Shutdown Current: I
IN
= 10
μ
A Typ
I
Oscillator Frequency: 1.5MHz
I
Soft-Start Limits Inrush Current at Turn On
I
Short-Circuit and Overtemperature Protected
I
Available in an 8-Pin MSOP Package
APPLICATIU
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.
I
Handheld Computers
I
Cellular Phones
I
Smart Card Readers
I
Portable Electronic Equipment
I
Handheld Medical Instruments
I
Low Power DSP Supplies
Final Electrical Specifications
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
FEATURES
DESCRIPTIOU
TYPICAL APPLICATIO
U
V
IN
C2
+
C2
–
GND
8
6
7
5
1
2
3
4
SS/SHDN
V
OUT
C1
+
C1
–
LTC1911-1.8
1
μ
F*
1-CELL Li-Ion
OR
3-CELL NiMH
10
μ
F*
*CERAMIC CAPACITOR
10
μ
F*
1911 TA01
V
OUT
= 1.8V
I
OUT
= 250mA
1
μ
F*
2.7V TO 5.5V INPUT
Single Cell Li-Ion to 1.8V DC/DC Converter
Efficiency
INPUT VOLTAGE (V)
2
30
E
40
50
60
70
80
90
3
4
5
6
1911 G05
IDEAL LDO
250mA
100mA
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