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PDF LT1613 Data sheet ( Hoja de datos )
| Número de pieza | LT1613 | |
| Descripción | 1.4MHz/ Single Cell DC/DC Converter in 5-Lead SOT-23 | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LT1613
1.4MHz, Single Cell DC/DC
Converter in 5-Lead SOT-23
FEATURES
s Uses Tiny Capacitors and Inductor
s Internally Compensated
s Fixed Frequency 1.4MHz Operation
s Operates with VIN as Low as 1.1V
s 3V at 30mA from a Single Cell
s 5V at 200mA from 3.3V Input
s 15V at 60mA from Four Alkaline Cells
s High Output Voltage: Up to 34V
s Low Shutdown Current: <1µA
s Low VCESAT Switch: 300mV at 300mA
s Tiny 5-Lead SOT-23 Package
U
APPLICATIO S
s Digital Cameras
s Pagers
s Cordless Phones
s Battery Backup
s LCD Bias
s Medical Diagnostic Equipment
s Local 5V or 12V Supply
s External Modems
s PC Cards
TYPICAL APPLICATIO
VIN
3.3V
+ C1
15µF
SHDN
L1
4.7µH
D1
VIN SW
LT1613
SHDN
FB
GND
R1
37.4k +
VOUT
5V
200mA
C2
22µF
R2
12.1k
L1: MURATA LQH3C4R7M24 OR SUMIDA CD43-4R7
C1: AVX TAJA156M010
C2: AVX TAJB226M006
D1: MBR0520
1613 TA01
Figure 1. 3.3V to 5V 200mA DC/DC Converter
DESCRIPTIO
The LT®1613 is the industry’s 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.
Efficiency Curve
100
95
90
85
80
75
70
65
60
55
50
0
VIN = 1.5V
VIN = 4.2V
VIN = 3.5V
VIN = 2.8V
50 100 150 200 250 300 350 400
LOAD CURRENT (mA)
1613 TA01a
1
1 page  
U
OPERATIO
LAYOUT
The LT1613 switches current at high speed, mandating
careful attention to layout for proper performance. You
will not get advertised performance with careless layouts.
Figure 2 shows recommended component placement for
a boost (step-up) converter. Follow this closely in your
PCB layout. Note the direct path of the switching loops.
Input capacitor C1 must be placed close (< 5mm) to the IC
package. As little as 10mm of wire or PC trace from CIN to
VIN will cause problems such as inability to regulate or
oscillation.
The ground terminal of output capacitor C2 should tie
close to Pin 2 of the LT1613. Doing this reduces dI/dt in the
ground copper which keeps high frequency spikes to a
minimum. The DC/DC converter ground should tie to the
PC board ground plane at one place only, to avoid intro-
ducing dI/dt in the ground plane.
A SEPIC (single-ended primary inductance converter)
schematic is shown in Figure 3. This converter topology
produces a regulated output voltage that spans (i.e., can
be higher or lower than) the output. Recommended com-
ponent placement for a SEPIC is shown in Figure 4.
LT1613
VIN
4V TO
7V
+
C1
15µF
SHDN
L1A
22µH
VIN SW
LT1613
SHDN
FB
GND
C3
1µF
R1
100k
R2
32.4k
L1B
22µH
D1
VOUT
+
5V/150mA
C2
15µF
C1, C2: AVX TAJA156M016
C3: TAIYO YUDEN JMK325BJ226MM
D1: MOTOROLA MBR0520
L1, L2: MURATA LQH3C220
1613 F03
Figure 3. Single-Ended Primary Inductance Converter (SEPIC)
Generates 5V from An Input Voltage Above or Below 5V
VOUT
D1
+
C2
L1B
C3
VIAS TO
GROUND
PLANE
L1A +
C1
15
2
34
R2
VIN
SHUTDOWN
VOUT
D1
+
C2
VIAS TO
GROUND
PLANE
L1 +
C1
VIN
15
2
3 4 SHUTDOWN
R2
GROUND
R1
1613 F02
Figure 2. Recommended Component Placement for Boost
Converter. Note Direct High Current Paths Using Wide PCB
Traces. Minimize Area at Pin 3 (FB). Use Vias to Tie Local
Ground Into System Ground Plane. Use Vias at Location Shown
to Avoid Introducing Switching Currents Into Ground Plane
GROUND
R1
1613 F04
Figure 4. Recommended Component Placement for SEPIC
COMPONENT SELECTION
Inductors
Inductors used with the LT1613 should have a saturation
current rating (where inductance is approximately 70% of
zero current inductance) of approximately 0.5A or greater.
DCR of the inductors should be 0.5Ω or less. For boost
converters, inductance should be 4.7µH for input voltage
less than 3.3V and 10µH for inputs above 3.3V. When
using the device as a SEPIC, either a coupled inductor or
two separate inductors can be used. If using separate
inductors, 22µH units are recommended for input voltage
above 3.3V. Coupled inductors have a beneficial mutual
inductance, so a 10µH coupled inductor results in the
same ripple current as two 20µH uncoupled units.
5
5 Page 
TYPICAL APPLICATIO S
4-Cell to 5V/50mA, 12V/10mA, 15V/10mA Digital Camera Power Supply
C1: TAIYO YUDEN JMK316BJ106ML
C2, C3, C4: TAIYO YUDEN EMK212BJ105MG
C5: TAIYO YUDEN JMK212BJ475MG
D1: MOTOROLA MBR0520
D2, D3: BAT54
T1: COILCRAFT CCI8245A (847) 639-6400
VIN 7V TO 3.6V
C1
10µF
VIN
2
5
T1
63
14
C2
SW 1µF
D3
C3
1µF
D2
C4
1µF
D1
C5
4.7µF
270pF
SHUTDOWN
LT1613
SHDN
FB
GND
102k
33.2k
15V/10mA
12V/10mA
5V/50mA
1613 TA07
LT1613
4-Cell to 5V/50mA, 15V/10mA, – 7.5V/10mA Digital Camera Power Supply
C1: TAIYO YUDEN JMK316BJ106ML
C2, C3, C4: TAIYO YUDEN EMK212BJ105MG
C5: TAIYO YUDEN JMK212BJ475MG
D1: MOTOROLA MBR0520
D2, D3: BAT54
T1: COILCRAFT CCI8244A (847) 639-6400
VIN 7V TO 3.6V
C1
10µF
VIN
2
5
T1
63
14
C2
SW 1µF
D2
C3
1µF
D1
C5
4.7µF
C4
1µF
D3
270pF
15V/10mA
5V/50mA
–7.5V/10mA
SHUTDOWN
LT1613
SHDN
FB
GND
102k
33.2k
1613 TA08
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LT1613.PDF ] | |
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