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PDF LTC3204B Data sheet ( Hoja de datos )
| Número de pieza | LTC3204B | |
| Descripción | Low Noise Regulated Charge Pump | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTC3204-3.3/LTC3204-5/
LTC3204B-3.3/LTC3204B-5
Low Noise Regulated
Charge Pump in 2 × 2 DFN
FEATURES
■ Fixed 3.3V or 5V Outputs
■ VIN Range:
1.8V to 4.5V (LTC3204-3.3/LTC3204B-3.3)
2.7V to 5.5V (LTC3204-5/LTC3204B-5)
■ Output Current:
Up to 150mA (LTC3204-5/LTC3204B-5)
Up to 50mA (LTC3204-3.3/LTC3204B-3.3)
■ Automatic Burst Mode® Operation with IQ = 48µA
(LTC3204-3.3/LTC3204-5)
■ Constant Frequency Operation at All Loads
(LTC3204B-3.3/LTC3204B-5)
■ Low Noise Constant Frequency (1.2MHz) Operation*
■ Built-In Soft-Start Reduces Inrush Current
■ Shutdown Disconnects Load from Input
■ Shutdown Current <1µA
■ Short-Circuit/Thermal Protection
■APAvPaiLlaIbCleAinTLIoOw UPrSofile 6-Lead DFN Package
■ 2 AA Cell to 3.3V
■ Li-Ion to 5V
■ USB On-The-Go Devices
■ White LED Drivers
■ Handheld Devices
TYPICAL APPLICATIO
2.2µF
2.7V TO 5.5V
2.2µF
5
2
C–
VIN
4
C+
VOUT
3
LTC3204-5/
1, 7
LTC3204B-5
GND
OFF ON 6 SHDN
5V
2.2µF
3204 TA01a
DESCRIPTIO
The LTC®3204-3.3/LTC3204-5/LTC3204B-3.3/LTC3204B-5
are low noise, constant frequency (1.2MHz) switched ca-
pacitor voltage doublers. The LTC3204-3.3/LTC3204B-3.3
can produce a regulated output voltage of 3.3V
from a minimum input voltage of 1.8V (2 alkaline cells)
whereas the LTC3204-5/LTC3204B-5 can produce 5V from
a minimum of 2.7V (Li-Ion battery) input.
LTC3204-3.3/LTC3204-5 feature automatic Burst Mode®
operation at light loads to maintain low supply current
whereas LTC3204B-3.3/LTC3204B-5 feature constant
frequency operation at any load. Built-in soft-start circuitry
prevents excessive inrush current during start-up. Thermal
shutdown and current-limit circuitry allow the parts to
survive a continuous short-circuit from VOUT to GND.
High switching frequency minimizes overall solution
footprint by allowing the use of tiny ceramic capaci-
tors. In shutdown, the load is disconnected from the
input and the quiescent current is reduced to <1µA. The
LTC3204-3.3/LTC3204-5/LTC3204B-3.3/LTC3204B-5 are
available in a low profile (0.75mm) 6-lead 2mm × 2mm
DFN package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Burst Mode is a registered trademark of Linear Technology Corporation.
*Protected by U.S. Patents including 6411531.
Output Ripple vs Load Current
30
OUTPUT CAPACITANCE = 2.2µF
25 VIN = 3.6V
20
15 LTC3204-5
10
LTC3204B-5
5
0
0 25 50 75 100 125 150
OUTPUT CURRENT (mA)
3204 TA01b
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1
1 page  
LTC3204-3.3/LTC3204-5/
LTC3204B-3.3/LTC3204B-5
TYwPwwI.CDaAtaSLheePt4EU.RcomFOR A CE CHARACTERISTICS (LTC3204-5/LTC3204B-5 ONLY)
(TA = 25°C, CFLY = CIN = COUT = 2.2µF unless otherwise specified)
Load Regulation
5.20
5.10
5.00
VIN = 4.2V
4.90
VIN = 3.6V
4.80
VIN = 2.7V
4.70
4.60
4.50
0
100 200 300 400
LOAD CURRENT (mA)
500
3204 G16
No-Load Input Current vs
Supply Voltage
70
68 LTC3204-5
4.0
3.6
66 3.2
64 2.8
62 2.4
60
LTC3204B-5
2.0
58 1.6
56 1.2
54 0.8
52 0.4
50
2.7
3 3.3 3.6 3.9 4.2
SUPPLY VOLTAGE (V)
0
4.5
3204 G19
Output Load Capability at 4%
Below Regulation
500 VOUT = 4.8V
450
400
TA = 90°C
350 TA = 25°C
300
250
200 TA = – 45°C
150
100
50
0
2.7 3.0 3.3 3.6 3.9 4.2
SUPPLY VOLTAGE (V)
3204 G17
Extra Input Current vs Load Current
(IIN-2ILOAD)
10
VIN = 3.6V
LTC3204B-5
(N0N-BURST MODE
1 OPERATION)
LTC3204-5
(BURST-MODE
OPERATION)
0.1
0.01
0.01
0.1 1 10 100
LOAD CURRENT (mA)
1000
3204 G20
Effective Open-Loop Output
Resistance vs Temperature
8
VIN = 2.7V
VOUT = 4.5V
7
6
5
4
–50
0 50
TEMPERATURE (°C)
100
3204 G18
Efficiency vs Supply Voltage
100
90
THEORETICAL MAX
80
70
60 IOUT = 100mA
50 IOUT = 10mA IOUT = 1mA
40
30
20
10
0
2.7 3.0 3.3 3.6 3.9 4.2 4.5
SUPPLY VOLTAGE (V)
3204 G21
VOUT Soft-Start
Output Ripple
Load Transient Response
VOUT
2V/DIV
SHDN
5V/DIV
VIN = 3.6V
IOUT = 100mA
500µs/DIV
VOUT
20mV/DIV
(AC COUPLED)
3204 G22
VIN = 3.6V
IOUT = 100mA
500ns/DIV
VOUT
50mV/DIV
(AC COUPLED)
100mA
IOUT
60mA
3204 G23
VIN = 3.6V
10µs/DIV
IOUT = 60mA TO 100mA STEP
3204 G24
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5 Page 
LTC3204-3.3/LTC3204-5/
LTC3204B-3.3/LTC3204B-5
APPLICATIO S Iwww.DataSheet4U.com FOR ATIO
This can be achieved from a printed circuit board layout
with a solid ground plane and a good connection to the
ground pins of LTC3204-3.3/LTC3204-5/LTC3204B-3.3/
LTC3204B-5 and the exposed pad of the DFN package.
Operation out of this curve will cause the junction tem-
perature to exceed 160°C which may trigger the thermal
shutdown.
3.0
2.5
2.0
1.5
1.0
0.5
0–50 –25 0 25 50 75 100 125 150
AMBIENT TEMPERATURE (C)
3204 G05
Figure 5. Maximum Power Dissipation
vs Ambient Temperature
PACKAGE DESCRIPTIO
DC Package
6-Lead Plastic DFN (2mm × 2mm)
(Reference LTC DWG # 05-08-1703)
2.50
±0.05
1.15
±0.05
0.61 ±0.05
(2 SIDES)
0.675 ±0.05
PACKAGE
OUTLINE
PIN 1 BAR
TOP MARK
(SEE NOTE 6)
0.25 ± 0.05
0.50 BSC
1.42 ±0.05
(2 SIDES)
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
0.200 REF
NOTE:
1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WCCD-2)
2. DRAWING NOT TO SCALE
3. ALL DIMENSIONS ARE IN MILLIMETERS
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE
TOP AND BOTTOM OF PACKAGE
R = 0.115
TYP
0.56 ± 0.05
(2 SIDES)
4
0.38 ± 0.05
6
2.00 ±0.10
(4 SIDES)
0.75 ±0.05
0.00 – 0.05
PIN 1
CHAMFER OF
EXPOSED PAD
31
(DC6) DFN 1103
0.25 ± 0.05
0.50 BSC
1.37 ±0.05
(2 SIDES)
BOTTOM VIEW—EXPOSED PAD
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 representation that
the interconnection of its circuits as described herein will not infringe on existing patent rights.
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11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LTC3204B.PDF ] | |
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