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PDF LT3484-2 Data sheet ( Hoja de datos )
| Número de pieza | LT3484-2 | |
| Descripción | Photoflash Capacitor Chargers | |
| Fabricantes | Linear Technology | |
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LT3484-0/LT3484w-w1w/.DLatTaS3he4et48U.c4om-2
Photoflash Capacitor
Chargers
FEATURES
■ Highly Integrated IC in 2mm × 3mm DFN Package
Reduces Solution Size
■ Uses Small Transformers:
5.8mm × 5.8mm × 3mm
■ Fast Photoflash Charge Times:
4.6s for LT3484-0 (0V to 320V, 100µF, VIN = 3.6V)
5.7s for LT3484-2 (0V to 320V, 100µF, VIN = 3.6V)
5.5s for LT3484-1 (0V to 320V, 50µF, VIN = 3.6V)
■ Operates from Two AA Batteries, or Any Supply from
1.8V up to 16V
■ Controlled Average Input Current
500mA (LT3484-0)
350mA (LT3484-2)
225mA (LT3484-1)
■ No Output Voltage Divider Needed
■ No External Schottky Diode Required
■ Charges Any Size Photoflash Capacitor
■ Available in 6-Lead 2mm × 3mm DFN Package
U
APPLICATIO S
■ Digital Camera and Cell Phone Flash Charger
DESCRIPTIO
The LT®3484 family of photoflash capacitor charger ICs is
designed for use in digital camera and mobile phone
applications where space is at a premium. The LT3484’s
patented control technique allows it to use extremely small
transformers, and the improved NPN power switch re-
quires no external Schottky diode clamp, reducing solu-
tion size. Output voltage detection requires no external
circuitry as the transformer turns ratio determines final
charge voltage.
The devices feature a VBAT pin, which allows the use of 2
alkaline cells to charge the capacitor. The LT3484-0, -2
and -1 have primary current limits of 1.4A, 1A and 0.7A
respectively, resulting in tightly controlled average input
current of 500mA, 350mA and 225mA respectively. The
three versions are otherwise identical.
The CHARGE pin gives full control of the part to the user.
Driving CHARGE low puts the part in shutdown. The DONE
pin indicates when the part has completed charging. The
LT3484 series of parts are housed in a tiny low profile
2mm × 3mm DFN package.
, LTC and LT are registered trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners. Protected by U.S. Patents
including 6636021.
TYPICAL APPLICATIO
LT3484-0 Photoflash Charger Uses
High Efficiency 3mm Tall Transformers
DANGER HIGH VOLTAGE – OPERATION BY HIGH VOLTAGE
TRAINED PERSONNEL ONLY
VBAT
2AA OR
1 TO 2 Li-Ion
4.7µF
1:10.2
14
25
VBAT
SW
VCC
5V
VIN
0.1µF
100k
LT3484-0
GND
320V
+ 150µF
PHOTOFLASH
CAPACITOR
DONE
CHARGE
348412 TA01
LT3484-0 Charging Waveform
VIN = 3.6V
COUT = 100µF
VOUT
50V/DIV
AVERAGE
INPUT
CURRENT
1A/DIV
1s/DIV
3484 TA02
3484012f
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1 page  
LT3484-0/LT3484w-w1w/.DLatTaS3he4et48U.c4om-2
TYPICAL PERFOR A CE CHARACTERISTICS LT3484-0 curves use the circuit of Figure 6,
LT3484-1 curves use the circuit of Figure 7 and LT3484-2 use the circuit of Figure 8, TA = 25°C unless otherwise noted.
LT3484-0 Switching Waveform
VIN = 3.6V
VOUT = 100V
VSW
10V/DIV
IPRI
1A/DIV
1µs/DIV
3484 G19
LT3484-1 Switching Waveform
VIN = 3.6V
VOUT = 100V
VSW
10V/DIV
IPRI
1A/DIV
1µs/DIV
3484 G22
LT3484-2 Switching Waveform
VIN = 3.6V
VOUT = 100V
VSW
10V/DIV
IPRI
1A/DIV
1µs/DIV
3484 G21
LT3484-0 Switching Waveform
VIN = 3.6V
VOUT = 300V
VSW
10V/DIV
IPRI
1A/DIV
1µs/DIV
3484 G20
LT3484-1 Switching Waveform
VIN = 3.6V
VOUT = 300V
LT3484-2 Switching Waveform
VIN = 3.6V
VOUT = 300V
VSW
10V/DIV
IPRI
1A/DIV
1µs/DIV
3484 G23
VSW
10V/DIV
IPRI
1A/DIV
1µs/DIV
3484 G24
LT3484-0/LT3484-1/LT3484-2
Switch Breakdown Voltage
10 SW PIN IS RESISTIVE UNTIL BREAKDOWN
9 VOLTAGE DUE TO INTEGRATED
RESISTORS. THIS DOES NOT INCREASE
8 QUIESCENT CURRENT OF PART
7
6 T = 25°C
5
4
T = –40°C
T = 85°C
3
2
1
0 VIN = VCHARGE = 5V
0 10 20 30 40 50 60 70 80 90 100
SWITCH VOLTAGE (V)
3484 G25
3484012f
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LT3484-0/LT3484w-w1w/.DLatTaS3he4et48U.c4om-2
TYPICAL APPLICATIO S
VBAT
1.8V TO 8V
C1
4.7µF
T1
1:10.2
D1
54
81
+
VCC
2.5V TO 8V
C2
0.1µF
DONE
CHARGE
6 4, 5
VBAT
3 VIN
SW
R1
GND
LT3484-2
7
100k
DONE
1
CHARGE
2
C1: 4.7µF, X5R OR X7R, 10V
T1: TDK LDT565630T-003 LPRI = 10.5µH, N = 10.2
D1: VISHAY GSD2004S DUAL DIODE CONNECTED IN SERIES
R1: PULL UP RESISTOR NEEDED IF DONE PIN USED
Figure 8. LT3484-2 Photoflash Charger Uses
High Efficiency 3mm Tall Transformer
320V
COUT
PHOTOFLASH
CAPACITOR
3484 F08
PACKAGE DESCRIPTIO
DCB Package
6-Lead Plastic DFN (2mm × 3mm)
(Reference LTC DWG # 05-08-1715)
0.70 ±0.05
2.00 ±0.10
(2 SIDES)
R = 0.115
TYP
R = 0.05
TYP
4
0.40 ± 0.10
6
3.55 ±0.05
1.65 ±0.05
(2 SIDES)
2.15 ±0.05
PACKAGE PIN 1 BAR
OUTLINE TOP MARK
(SEE NOTE 6)
0.25 ± 0.05
0.50 BSC
1.35 ±0.05
(2 SIDES)
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
0.200 REF
3.00 ±0.10 1.65 ± 0.10
(2 SIDES) (2 SIDES)
0.75 ±0.05
0.00 – 0.05
PIN 1 NOTCH
R0.20 OR 0.25
× 45° CHAMFER
31
(DCB6) DFN 0405
0.25 ± 0.05
0.50 BSC
1.35 ±0.10
(2 SIDES)
BOTTOM VIEW—EXPOSED PAD
NOTE:
1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (TBD)
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
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.
3484012f
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11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LT3484-2.PDF ] | |
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