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LTC1474 Fiches technique(PDF) 1 Page - Linear Technology

No de pièce LTC1474
Description  Low Quiescent Current High Efficiency Step-Down Converters
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Fabricant  LINER [Linear Technology]
Site Internet  http://www.linear.com
Logo LINER - Linear Technology

LTC1474 Fiches technique(HTML) 1 Page - Linear Technology

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LTC1474/LTC1475
Low Quiescent Current
High Efficiency Step-Down
Converters
LOAD CURRENT (mA)
100
90
80
70
60
50
0.03
3
300
1474/75 TA01
0.3
30
VIN = 5V
VIN = 10V
VIN = 15V
L = 100
µH
VOUT = 3.3V
RSENSE = 0Ω
LTC1474 Efficiency
Figure 1. High Efficiency Step-Down Converter
VIN
GND
SENSE
LBI
RUN
VFB
LBO
SW
LTC1474-3.3
+
6
3
8
1
2
5
7
4
100k
LOW BATTERY IN
RUN SHDN
0.1
µF
10
µF
25V
VIN
4V TO 18V
LOW BATTERY OUT
1474/75 F01
L1
100
µH
D1
MBR0530
+
100
µF
6.3V
VOUT
3.3V AT 250mA
L1 = SUMIDA CDRH74-101
FEATURES
DESCRIPTION
s
High Efficiency: Over 92% Possible
s
Very Low Standby Current: 10
µA Typ
s
Available in Space Saving 8-Lead MSOP Package
s
Internal 1.4
Ω Power Switch (VIN = 10V)
s
Wide VIN Range: 3V to 18V Operation
s
Very Low Dropout Operation: 100% Duty Cycle
s
Low-Battery Detector Functional During Shutdown
s
Programmable Current Limit with Optional
Current Sense Resistor (10mA to 400mA Typ)
s
Short-Circuit Protection
s
Few External Components Required
s
Active Low Micropower Shutdown: IQ = 6µA Typ
s
Pushbutton On/Off (LTC1475 Only)
s
3.3V, 5V and Adjustable Output Versions
The LT C
®1474/LTC1475 series are high efficiency step-
down converters with internal P-channel MOSFET power
switches that draw only 10
µA typical DC supply current at
no load while maintaining output voltage. The LTC1474
uses logic-controlled shutdown while the LTC1475 fea-
tures pushbutton on/off.
The low supply current coupled with Burst Mode
TM opera-
tion enables the LTC1474/LTC1475 to maintain high effi-
ciency over a wide range of loads. These features, along
with their capability of 100% duty cycle for low dropout
and wide input supply range, make the LTC1474/LTC1475
ideal for moderate current (up to 300mA) battery-powered
applications.
The peak switch current is user-programmable with an
optional sense resistor (defaults to 325mA minimum if not
used) providing a simple means for optimizing the design
for lower current applications. The peak current control
also provides short-circuit protection and excellent start-
up behavior. A low-battery detector that remains functional
in shutdown is provided .
The LTC1474/LTC1475 series availability in 8-lead MSOP
and SO packages and need for few additional components
provide for a minimum area solution.
APPLICATIONS
s
Cellular Telephones and Wireless Modems
s
4mA to 20mA Current Loop Step-Down Converter
s
Portable Instruments
s
Battery-Operated Digital Devices
s
Battery Chargers
s
Inverting Converters
s
Intrinsic Safety Applications
TYPICAL APPLICATION
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.


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