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PDF LT1304CS8 Data sheet ( Hoja de datos )
| Número de pieza | LT1304CS8 | |
| Descripción | Micropower DC/DC Converters with Low-Battery Detector Active in Shutdown | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LT1304CS8 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
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LT1304/LT1304-3.3/LT1304-5
Micropower
DC/DC Converters with
Low-Battery Detector
Active in Shutdown
FEATURES
s 5V at 200mA from Two Cells
s 10µA Quiescent Current in Shutdown
s Operates with VIN as Low as 1.5V
s Low-Battery Detector Active in Shutdown
s Low Switch VCESAT: 370mV at 1A Typical
s 120µA Quiescent Current in Active Mode
s Switching Frequency Up to 300kHz
s Programmable Peak Current with One Resistor
s 8-Lead SO Package
U
APPLICATIONS
s 2-, 3-, or 4-Cell to 5V or 3.3V Step-Up
s Portable Instruments
s Bar Code Scanners
s Palmtop Computers
s Diagnostic Medical Instrumentation
s Personal Data Communicators/Computers
DESCRIPTION
The LT®1304 is a micropower step-up DC/DC converter
ideal for use in small, low voltage, battery-operated sys-
tems. The devices operate from a wide input supply range
of 1.5V to 8V. The LT1304-3.3 and LT1304-5 generate
regulated outputs of 3.3V and 5V and the adjustable
LT1304 can deliver output voltages up to 25V. Quiescent
current, 120µA in active mode, decreases to just 10µA in
shutdown with the low-battery detector still active. Peak
switch current, internally set at 1A, can be reduced by
adding a single resistor from the ILIM pin to ground. The
high speed operation of the LT1304 allows the use of
small, surface-mountable inductors and capacitors. The
LT1304 is available in an 8-lead SO package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
2-Cell to 5V Step-Up Converter with Low-Battery Detect
22µH*
D1**
+
2 CELLS
100µF
*SUMIDA CD54-220
**1N5817
499k
3
VIN
1
LBI
4
SW
8
SENSE
604k
6
NC
LT1304-5
ILIM
SHDN
7
LBO
GND
5
2
SHUTDOWN
+
100k
5V
200mA
100µF
LBO
LOW WHEN
VBAT < 2.2V
1304 TA01
90
80
70
60
50
40
0.1
Efficiency
VIN = 3.3V
VIN = 2.5V
VIN = 1.8V
1 10 100
LOAD CURRENT (mA)
500
1304 TA02
1
1 page  
BLOCK DIAGRA S
LT1304/LT1304-3.3/LT1304-5
LB0
2
VIN +
C1
L1
VIN
3
D1 +
SW
4
VOUT
C2
LBI
1
+
–
1.17V
A3
R3
FB
8
R4
–
A1
+
ENABLE
1.5V
UNDERVOLTAGE
LOCKOUT
+
A2
–
36mV
R2
1k
BIAS
OFF ~1V
Q3
TIMERS
6µs ON
1.5µs OFF
1k
DRIVER
R1
7.2Ω
Q2
×1
Q1
×200
1.24V
VREF
SHUTDOWN
SHDN
7
6 ILIM
GND
5
1304 F01
Figure 1. LT1304 Block Diagram. Independent Low-Battery Detector A3 Remains Alive When Device Is in Shutdown
LBI LB0
12
VIN SW
34
SENSE
8
590k
R1
+
–
1.17V
A3
1.5V
UNDERVOLTAGE
LOCKOUT
+
A2
–
36mV
R2
1k
BIAS
OFF ~1V
Q3
–
A1
+
ENABLE
TIMERS
6µs ON
1.5µs OFF
1k
DRIVER
R1
7.2Ω
Q2
×1
Q1
×200
1.24V
VREF
R1 = 355k (LT1304-3.3), 195k (LT1304-5)
SHUTDOWN
SHDN
7
6 ILIM
GND
5
1304 F02
Figure 2. LT1304-3.3/LT1304-5 Block Diagram
5
5 Page 
TYPICAL APPLICATIONS
2-Cell to 3.3V Boost Converter
L1*
22µH
MBRS130L
+
2 CELLS
C1**
100µF
VIN SW
SENSE
LT1304-3.3
SHDN
ILIM
GND
SHUTDOWN NC
*SUMIDA CD54-220
**AVX TPSD107M010R0100
3.3V
300mA
+ C2**
100µF
10V
1304 TA05
VIN
2.5V TO 8V
SHUTDOWN
3.3V SEPIC (Step-Up/Step-Down Converter)
L1A*
C1**
1µF
21
+ C2†
47µF
16V
VIN SW
LT1304-3.3
SHDN
ILIM
SENSE
GND
NC
4
L1B*
MBRS130L
3
3.3V
300mA
+ C3††
100µF
10V
*COILTRONICS CTX20-1
**TOKIN 1E105ZY5U-C103-F
† AVX TPSD476M016R0150
†† AVX TPSD107M010R0100
1304 TA07
LT1304/LT1304-3.3/LT1304-5
2-Cell to 3.3V Converter Efficiency
90
80
70
60
50
40
30
0.1
VIN = 3.3V
VIN = 2.5V
VIN = 21.58V
1 10 100
LOAD CURRENT (mA)
1000
1304 TA06
3.3V SEPIC Efficiency
80
75
70
65
60
55
VIN = 4.5V
VIN = 3.5V
VIN = 2.5V
50
1 10 100 500
LOAD CURRENT (mA)
1304 TA08
VIN
3V TO 8V
SHUTDOWN
5V SEPIC (Step-Up/Step-Down Converter)
L1A*
C1**
1µF
21
+ 47µF†
16V
VIN SW
LT1304-5
4
L1B*
3
SHDN
ILIM
SENSE
GND
+
NC
MBRS130L
5V
200mA
100µF††
10V
*COILTRONICS CTX20-1
**TOKIN 1E105ZY5U-C103-F
†AVX TPSD476M016R0150
†† AVX TPSD107M010R0100
1304 TA09
5V SEPIC Efficiency
80
75
70
65
60
VIN = 6V
55
VIN = 5V
VIN = 4V
VIN = 3V
50
1 10 100 500
LOAD CURRENT (mA)
1304 TA10
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LT1304CS8.PDF ] | |
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