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LTC1474CMS8#PBF

Description
Conv DC-DC 3V to 18V Step Down Single-Out 0.3A 8-Pin MSOP Tube
CategoryPower/power management    The power supply circuit   
File Size238KB,20 Pages
ManufacturerADI
Websitehttps://www.analog.com
Environmental Compliance
Download Datasheet Parametric View All

LTC1474CMS8#PBF Overview

Conv DC-DC 3V to 18V Step Down Single-Out 0.3A 8-Pin MSOP Tube

LTC1474CMS8#PBF Parametric

Parameter NameAttribute value
EU restricts the use of certain hazardous substancesCompliant
ECCN (US)EAR99
Part StatusActive
TypeStep Down
Output TypeAdjustable
Switching RegulatorNo
Number of Outputs1
Maximum Output Current (A)0.3
Minimum Input Voltage (V)3
Maximum Input Voltage (V)18
Operating Supply Voltage (V)3 to 18
Typical Switch Current (A)0.75
Typical Quiescent Current (uA)100
Line Regulation20mV
Load Regulation15mV
Efficiency (%)92
Minimum Operating Temperature (°C)0
Maximum Operating Temperature (°C)70
Supplier Temperature GradeCommercial
PackagingTube
Pin Count8
Standard Package NameMSOP
Supplier PackageMSOP
MountingSurface Mount
Package Height0.86
Package Length3
Package Width3
PCB changed8
Lead ShapeGull-wing
LTC1474/LTC1475
Low Quiescent Current
High Efficiency Step-Down
Converters
DESCRIPTION
The LT C
®
1474/LTC1475 series are high efficiency step-
down converters with internal P-channel MOSFET power
switches that draw only 10µA 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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.
FEATURES
s
s
s
s
s
s
s
s
s
s
s
s
s
High Efficiency: Over 92% Possible
Very Low Standby Current: 10
µ
A Typ
Available in Space Saving 8-Lead MSOP Package
Internal 1.4Ω Power Switch (V
IN
= 10V)
Wide V
IN
Range: 3V to 18V Operation
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
Q
= 6µA Typ
Pushbutton On/Off (LTC1475 Only)
3.3V, 5V and Adjustable Output Versions
APPLICATIONS
s
s
s
s
s
s
s
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
TYPICAL APPLICATION
100
V
IN
4V TO 18V
LOW BATTERY OUT
+
10µF
25V
0.1µF
6
7
V
IN
1
SENSE
V
FB
LTC1474-3.3
3
2
LBO
LBI
8
RUN
SW
5
D1
MBR0530
1474/75 F01
V
OUT
3.3V AT 250mA
L1
100µH
EFFICIENCY (%)
LOW BATTERY IN
RUN SHDN
100k
+
100µF
6.3V
GND
4
L1 = SUMIDA CDRH74-101
Figure 1. High Efficiency Step-Down Converter
U
U
U
LTC1474 Efficiency
90
V
IN
= 5V
V
IN
= 10V
80
V
IN
= 15V
70
60
L = 100µH
V
OUT
= 3.3V
R
SENSE
= 0Ω
0.03
3
0.3
30
LOAD CURRENT (mA)
300
1474/75 TA01
50
1
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