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LT1613 Datasheet

  • LT1613

  • 1.4MHz, Single Cell DC/DC Converter in 5-Lead SOT-23

  • 12頁

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LT1613
1.4MHz, Single Cell DC/DC
Converter in 5-Lead SOT-23
FEATURES
s
s
s
s
s
s
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s
s
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DESCRIPTIO
Uses Tiny Capacitors and Inductor
Internally Compensated
Fixed Frequency 1.4MHz Operation
Operates with V
IN
as Low as 1.1V
3V at 30mA from a Single Cell
5V at 200mA from 3.3V Input
15V at 60mA from Four Alkaline Cells
High Output Voltage: Up to 34V
Low Shutdown Current: <1碌A(chǔ)
Low V
CESAT
Switch: 300mV at 300mA
Tiny 5-Lead SOT-23 Package
The LT
廬
1613 is the industry鈥檚 first 5-lead SOT-23 current
mode DC/DC converter. Intended for small, low power
applications, it operates from an input voltage as low as
1.1V and switches at 1.4MHz, allowing the use of tiny, low
cost capacitors and inductors 2mm or less in height. Its
small size and high switching frequency enables the
complete DC/DC converter function to take up less than
0.2 square inches of PC board area. Multiple output power
supplies can now use a separate regulator for each output
voltage, replacing cumbersome quasi-regulated ap-
proaches using a single regulator and a custom trans-
former.
A constant frequency, internally compensated current
mode PWM architecture results in low, predictable output
noise that is easy to filter. The high voltage switch on the
LT1613 is rated at 36V, making the device ideal for boost
converters up to 34V as well as for Single-Ended Primary
Inductance Converter (SEPIC) and flyback designs. The
device can generate 5V at up to 200mA from a 3.3V supply
or 5V at 175mA from four alkaline cells in a SEPIC design.
The LT1613 is available in the 5-lead SOT-23 package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
s
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Digital Cameras
Pagers
Cordless Phones
Battery Backup
LCD Bias
Medical Diagnostic Equipment
Local 5V or 12V Supply
External Modems
PC Cards
TYPICAL APPLICATIO
L1
4.7碌H
V
IN
3.3V
D1
V
OUT
5V
200mA
100
95
90
EFFICIENCY (%)
+
V
IN
C1
15碌F
SHDN
LT1613
SHDN
GND
SW
R1
37.4k
+
C2
22碌F
85
80
75
70
65
V
IN
= 1.5V
V
IN
= 2.8V
V
IN
= 3.5V
FB
R2
12.1k
L1: MURATA LQH3C4R7M24 OR SUMIDA CD43-4R7
C1: AVX TAJA156M010
C2: AVX TAJB226M006
D1: MBR0520
60
1613 TA01
55
50
0
50
100 150 200 250 300 350 400
LOAD CURRENT (mA)
1613 TA01a
Figure 1. 3.3V to 5V 200mA DC/DC Converter
U
Efficiency Curve
V
IN
= 4.2V
U
U
1

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