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LTC1574_15

Description
High Efficiency Step-Down DC/DC Converters with Internal Schottky Diode
File Size175KB,8 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
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LTC1574_15 Overview

High Efficiency Step-Down DC/DC Converters with Internal Schottky Diode

LTC1574
LTC1574-3.3/LTC1574-5
High Efficiency Step-Down
DC/DC Converters
with Internal Schottky Diode
FEATURES
s
s
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s
s
s
s
s
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s
DESCRIPTIO
High Efficiency: Up to 94%
Usable in Noise-Sensitive Products
Peak Inductor Current Independent of Inductor Value
Short-Circuit Protection
Internal Low Forward Drop Schottky Diode
Only Three External Components Required
Wide V
IN
Range: 4V to 18.5V (Absolute Maximum)
Low Dropout Operation
Low-Battery Detector
Pin Selectable Current Limit
Internal 0.9Ω Power Switch: V
IN
< 11V
Standby Current: 130µA
Active Low Micropower Shutdown
The LTC
®
1574 is a family of easy-to-use current mode
DC/DC converters ideally suited for 9V to 5V, 5V to 3.3V
and inverting operation. With an internal 0.9Ω switch (at
a supply voltage of 12V) and a low forward drop Schottky
diode (0.450V typ at 200mA, T
A
= 25°C), the LTC1574
requires only three external components to construct a
complete high efficiency DC/DC converter.
Under no load condition, the LTC1574 draws only 130µA.
In shutdown, it draws a mere 2µA making this converter
ideal for battery-powered applications. In dropout, the
internal P-channel MOSFET switch is turned on continu-
ously allowing the user to maximize the life of the battery
source.
The maximum inductor current of the LTC1574 family is
pin selectable to either 340mA or 600mA, optimizing
efficiency for a wide range of applications. Operation up to
200kHz permits the use of small surface mount inductors
and capacitors.
For applications requiring higher output current or ultra-
high efficiency, see the LTC1148 or LTC1265 data sheets.
For detailed applications information, see the LTC1174
data sheet.
APPLICATIO S
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Inverting Converters
Step-Down Converters
Memory Backup Supply
Portable Instruments
Battery-Powered Equipment
Distributed Power Systems
and LTC are registered trademarks and LT is a trademark of Linear Technology Corporation.
TYPICAL APPLICATIO
V
IN
5.5V to
16V
12
11
6
High Efficiency Step-Down Converter
LTC1574-5 Efficiency
100
95
L = 100µH
V
OUT
= 5V
I
PGM
= 0V
V
IN
= 6V
5
V
IN
LB
IN
LTC1574-5
LB
OUT
I
PGM
GND
2, 4, 13, 15
V
OUT
SW
SHDN
7
10
3, 14
100µH
+
EFFICIENCY (%)
22µF*
35V
90
V
IN
= 9V
85
80
75
70
+
5V
175mA
100µF*
10V
1574 TA01
* AVX TPSD226K035
** AVX TPSD107K010
COILTRONICS CTX100-4
1
U
10
LOAD CURRENT (mA)
100 200
1574 TA02
U
U
1

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LTC1574_15 LTC1574-3.3_15 LTC1574-5_15
Description High Efficiency Step-Down DC/DC Converters with Internal Schottky Diode High Efficiency Step-Down DC/DC Converters with Internal Schottky Diode High Efficiency Step-Down DC/DC Converters with Internal Schottky Diode
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