LTC1574-3.3 LINER [Linear Technology], LTC1574-3.3 Datasheet

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LTC1574-3.3

Manufacturer Part Number
LTC1574-3.3
Description
High Efficiency Step-Down DC/DC Converters with Internal Schottky Diode
Manufacturer
LINER [Linear Technology]
Datasheet
APPLICATIONS
FEATURES
TYPICAL
5.5V to
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
Low Dropout Operation
Low-Battery Detector
Pin Selectable Current Limit
Internal 0.9 Power Switch: V
Standby Current: 130 A
Active Low Micropower Shutdown
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.
16V
V
IN
IN
12
11
6
Range: 4V to 18.5V (Absolute Maximum)
High Efficiency Step-Down Converter
LB
LB
I
APPLICATION
PGM
IN
OUT
LTC1574-5
U
GND
V
IN
5
2, 4, 13, 15
SHDN
V
OUT
SW
** AVX TPSD107K010
* AVX TPSD226K035
COILTRONICS CTX100-4
7
10
3, 14
IN
U
= 12V
100 H
+
+
22 F*
35V
100 F*
10V
5V
175mA
1574 TA01
with Internal Schottky Diode
High Efficiency Step-Down
The LTC
DC/DC converters ideally suited for 9V to 5V, 5V to 3.3V
and inverting operation. With an internal 0.9 switch (at
a supply voltage of 12V) and a low forward drop Schottky
diode (0.450V typ at 200mA, T
requires only three external components to construct a
complete high efficiency DC/DC converter.
Under no load condition, the LTC1574 draws only 130 A.
In shutdown, it draws a mere 2 A 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 and LTC1265 data sheets.
For detailed applications information, see the LTC1174
data sheet.
DESCRIPTION
®
1574 is a family of easy-to-use current mode
100
95
90
85
80
75
70
1
LTC1574-3.3/LTC1574-5
L = 100 H
V
I
DC/DC Converters
PGM
OUT
LTC1574-5 Efficiency
= 0V
= 5V
U
LOAD CURRENT (mA)
10
V
V
IN
IN
= 6V
= 9V
A
= 25 C), the LTC1574
100
1574 TA02
LTC1574
200
1

Related parts for LTC1574-3.3

LTC1574-3.3 Summary of contents

Page 1

... LTC1148 and LTC1265 data sheets. For detailed applications information, see the LTC1174 data sheet 35V † 100 H 5V 175mA + 100 F* 10V 1574 TA01 LTC1574 LTC1574-3.3/LTC1574-5 DC/DC Converters C), the LTC1574 A LTC1574-5 Efficiency 100 L = 100 OUT ...

Page 2

... SHUTDOWN CONDITIONS LTC1574 LTC1574 LTC1574-3.3 LTC1574 12V 100mA (Note 2) IN LOAD PGM IN LTC1574-3.3 (Note 2) 20mA < I < 175mA, I LOAD 20mA < I < 400mA, I LOAD LTC1574-5 (Note 2) 20mA < I < 175mA, I LOAD 20mA < I < 400mA, I LOAD 4V < V < 16V PGM 4V < ...

Page 3

... LOAD CURRENT (mA) Switch Leakage Current vs Temperature 180 V = 13.5V IN 160 140 120 100 TEMPERATURE ( C) LTC1574 LTC1574-3.3/LTC1574 0V, unless otherwise specified. IN PGM MIN TYP 0.450 0.570 10 100 Efficiency vs Input Voltage 95 V OUT L = 100 H 94 COIL = CTX100 ...

Page 4

... Depending on the condition of the OUT to the main voltage comparator input. On the LTC1574-5 and LTC1574-3.3, this pin goes to an internal resistive divider which sets the output voltage. LB (Pin 11): Open drain of an N-Channel Pull-Down. OUT This pin will sink current when (Pin 12 ...

Page 5

... The peak-to-peak output ripple is reduced to 30mV over the entire load range. A toroidal surface mount R1 Burst Mode is a trademark of Linear Technology Corporation 1574 • F03 PGM LTC1574 LTC1574-3.3/LTC1574-5 INPUT VOLTAGE 4V TO 12V + + 5 0 SHDN IN ...

Page 6

... LTC1574 LTC1574-3.3/LTC1574 APPLICATIONS INFORMATION inductor L1 is chosen for its excellent self-shielding prop- erties. Open magnetic structures such as drum and rod cores are to be avoided since they inject high flux levels into their surroundings. This can become a major source of noise in any converter circuit. ...

Page 7

... Positive to –5V Converter 12. *LOW- 6 BATTERY I PGM INDICATOR 11 LB 280k OUT LTC1574 GND 43k 2, 4, 13, 15 LTC1574 LTC1574-3.3/LTC1574 F** 0.1 F 16V 2 7 SHDN 10 V OUT OUT 365mA † 47 F** 100 H 16V 2 1574 TA04 22 F* 0.1 F ...

Page 8

... LTC1574 LTC1574-3.3/LTC1574-5 PACKAGE DESCRIPTION 0.010 – 0.020 45 (0.254 – 0.508) 0.008 – 0.010 0 – 8 TYP (0.203 – 0.254) 0.016 – 0.050 0.406 – 1.270 * DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE ** DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" ...

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