LTC1474 LINER [Linear Technology], LTC1474 Datasheet

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LTC1474

Manufacturer Part Number
LTC1474
Description
Low Quiescent Current High Efficiency Step-Down Converters
Manufacturer
LINER [Linear Technology]
Datasheet

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APPLICATIONS
FEATURES
TYPICAL
4V TO 18V
High Efficiency: Over 92% Possible
Very Low Standby Current: 10 A Typ
Available in Space Saving 8-Lead MSOP Package
Internal 1.4 Power Switch (V
Wide V
Very Low Dropout Operation: 100% Duty Cycle
Low-Battery Detector Functional During Shutdown
Programmable Current Limit with Optional
Current Sense Resistor (10mA to 400mA Typ)
Short-Circuit Protection
Few External Components Required
Active Low Micropower Shutdown: I
Pushbutton On/Off (LTC1475 Only)
3.3V, 5V and Adjustable Output Versions
Cellular Telephones and Wireless Modems
4mA to 20mA Current Loop Step-Down Converter
Portable Instruments
Battery-Operated Digital Devices
Battery Chargers
Inverting Converters
Intrinsic Safety Applications
V
IN
LOW BATTERY IN
+
IN
L1 = SUMIDA CDRH74-101
Range: 3V to 18V Operation
RUN SHDN
10 F
25V
APPLICATION
Figure 1. High Efficiency Step-Down Converter
U
0.1 F
100k
6
3
8
SENSE
LBI
RUN
IN
U
LTC1474-3.3
= 10V)
GND
V
IN
Q
7
4
= 6 A Typ
LBO
V
SW
FB
1
2
5
LOW BATTERY OUT
L1
100 H
D1
MBR0530
High Efficiency Step-Down
DESCRIPTION
The LT C
down converters with internal P-channel MOSFET power
switches that draw only 10 A 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
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.
Burst Mode is a trademark of Linear Technology Corporation.
+
, LTC and LT are registered trademarks of Linear Technology Corporation.
100 F
6.3V
V
3.3V AT 250mA
Low Quiescent Current
OUT
®
1474/LTC1475 series are high efficiency step-
1474/75 F01
U
100
90
80
70
60
50
LTC1474/LTC1475
0.03
LTC1474 Efficiency
V
IN
0.3
Converters
LOAD CURRENT (mA)
= 5V
V
IN
V
= 10V
3
IN
= 15V
R
V
SENSE
OUT
L = 100 H
30
TM
= 3.3V
opera-
1474/75 TA01
= 0
1
300

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