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LTC1911-1.8_15

Description
Low Noise, High Efficiency, Inductorless Step-Down DC/DC Converter
File Size219KB,12 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
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LTC1911-1.8_15 Overview

Low Noise, High Efficiency, Inductorless Step-Down DC/DC Converter

LTC1911-1.5/LTC1911-1.8
Low Noise, High Efficiency,
Inductorless Step-Down
DC/DC Converter
FEATURES
s
s
s
s
s
s
s
s
s
s
s
s
s
DESCRIPTIO
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
= 180µA Typ
Low Shutdown Current: I
IN
= 10µA 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
further reduce conducted noise. To optimize efficiency,
the part enters Burst Mode
®
operation under light load
conditions.
Low operating current (180µA with no load, 10µA in
shutdown) and low external parts count (two 1µF flying
capacitors and two 10µF 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.
APPLICATIO S
s
s
s
s
s
s
Handheld Computers
Cellular Phones
Smart Card Readers
Portable Electronic Equipment
Handheld Medical Instruments
Low Power DSP Supplies
, 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
90
Single Cell Li-Ion to 1.8V DC/DC Converter
80
100mA
LTC1911-1.8
2.7V TO 5.5V INPUT
1-CELL Li-Ion
OR
3-CELL NiMH
10µF*
1µF*
1
2
3
4
*CERAMIC CAPACITOR
30
2
3
4
5
INPUT VOLTAGE (V)
6
1911 G05
V
IN
C2
+
C2
GND
SS/SHDN
V
OUT
C1
+
C1
8
6
7
5
1µF*
1911 TA01
EFFICIENCY (%)
70
60
50
IDEAL LDO
40
V
OUT
= 1.8V
V
OUT
= 1.8V
I
OUT
= 250mA
10µF*
U
Efficiency
250mA
1911f
U
U
1

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