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PDF LT3468-2 Data sheet ( Hoja de datos )
| Número de pieza | LT3468-2 | |
| Descripción | Photoflash Capacitor Chargers | |
| Fabricantes | Linear | |
| Logotipo |  |
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LT3468/LT3468-1/LT3468-2
Photoflash Capacitor
Chargers in ThinSOTTM
FEATURES
■ Highly Integrated IC Reduces Solution Size
■ Uses Small Transformers:
5.8mm × 5.8mm × 3mm
■ Fast Photoflash Charge Times:
4.6s for LT3468 (0V to 320V, 100µF, VIN = 3.6V)
5.7s for LT3468-2 (0V to 320V, 100µF, VIN = 3.6V)
5.5s for LT3468-1 (0V to 320V, 50µF, VIN = 3.6V)
■ Controlled Input Current:
500mA (LT3468)
375mA (LT3468-2)
225mA (LT3468-1)
■ Supports Operation from Single Li-Ion Cell, or Any
Supply from 2.5V up to 16V
■ Adjustable Output Voltage
■ No Output Voltage Divider Needed
■ Charges Any Size Photoflash Capacitor
■ Low Profile (<1mm) SOT-23 Package
U
APPLICATIO S
■ Digital / Film Camera Flash
■ PDA / Cell Phone Flash
■ Emergency Strobe
DESCRIPTIO
The LT®3468/LT3468-1/LT3468-2 are highly integrated
ICs designed to charge photoflash capacitors in digital and
film cameras. A patented control technique* allows for the
use of extremely small transformers. Each device contains
an on-chip high voltage NPN power switch. Output voltage
detection* is completely contained within the device,
eliminating the need for any discrete zener diodes or
resistors. The output voltage can be adjusted by simply
changing the turns ratio of the transformer. The LT3468
has a primary current limit of 1.4A, the LT3468-2 has a 1A
limit, and the LT3468-1 has a 0.7A limit. These different
current limit levels result in well controlled input currents
of 500mA for the LT3468, 375mA for the LT3468-2 and
225mA for the LT3468-1. Aside from the differing current
limit, the three devices are otherwise equivalent.
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
LT3468 series of parts are available in tiny low profile
(1mm) SOT-23 packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
*Protected by U.S. Patents, including 6518733.
TYPICAL APPLICATIO
LT3468 Photoflash Charger Uses
High Efficiency 4mm Tall Transformer
DANGER HIGH VOLTAGE – OPERATION BY HIGH VOLTAGE
TRAINED PERSONNEL ONLY
VIN
2.5V TO 8V
4.7µF
1:10.2
14
25
320V
+
100µF
100k
DONE
VIN SW
LT3468
DONE
GND
CHARGE
CHARGE
346812 TA01
LT3468 Charging Waveform
VIN = 3.6V
COUT = 100µF
VOUT
50V/DIV
AVERAGE
INPUT
CURRENT
1A/DIV
1s/DIV
3468 G01
346812fa
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1 page  
LT3468/LT3468-1/LT3468-2
TYPICAL PERFOR A CE CHARACTERISTICS LT3468 curves use the circuit of Figure 6, LT3468-1
curves use the circuit of Figure 7 and LT3468-2 use the circuit of Figure 8 unless otherwise noted.
LT3468 Switching Waveform
VIN = 3.6V
VOUT = 100V
LT3468-1 Switching Waveform
VIN = 3.6V
VOUT = 100V
LT3468-2 Switching Waveform
VIN = 3.6V
VOUT = 100V
VSW
10V/DIV
IPRI
1A/DIV
1µs/DIV
VSW
10V/DIV
IPRI
1A/DIV
3468 G19
1µs/DIV
VSW
10V/DIV
IPRI
1A/DIV
3468 G22
1µs/DIV
3468 G21
LT3468 Switching Waveform
VIN = 3.6V
VOUT = 300V
LT3468-1 Switching Waveform
VIN = 3.6V
VOUT = 300V
LT3468-2 Switching Waveform
VIN = 3.6V
VOUT = 300V
VSW
10V/DIV
IPRI
1A/DIV
1µs/DIV
VSW
10V/DIV
IPRI
1A/DIV
3468 G20
1µs/DIV
VSW
10V/DIV
IPRI
1A/DIV
3468 G23
LT3468/LT3468-1/LT3468-2
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)
3468 G25
1µs/DIV
3468 G24
346812fa
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5 Page 
LT3468/LT3468-1/LT3468-2
TYPICAL APPLICATIO S
VIN
2.5V TO 8V
C1
4.7µF
T1
1:10.2
D1
54
81
+
R1
100k
DONE
VIN SW
LT3468-2
DONE
GND
D2
320V
COUT
PHOTOFLASH
CAPACITOR
CHARGE
CHARGE
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
D2: ZETEX ZHCS400 OR EQUIVALENT
R1: PULL UP RESISTOR NEEDED IF DONE PIN USED
3468 F08
Figure 8. LT3468-2 Photoflash Charger Uses High Efficiency 3mm Tall Transformer
PACKAGE DESCRIPTIO
0.62 0.95
MAX REF
S5 Package
5-Lead Plastic TSOT-23
(Reference LTC DWG # 05-08-1635)
1.22 REF
2.90 BSC
(NOTE 4)
3.85 MAX 2.62 REF
1.4 MIN
2.80 BSC
1.50 – 1.75
(NOTE 4)
RECOMMENDED SOLDER PAD LAYOUT
PER IPC CALCULATOR
0.20 BSC
DATUM ‘A’
PIN ONE
0.95 BSC
0.80 – 0.90
1.00 MAX
0.30 – 0.50 REF
0.09 – 0.20
NOTE:
(NOTE 3)
1. DIMENSIONS ARE IN MILLIMETERS
2. DRAWING NOT TO SCALE
3. DIMENSIONS ARE INCLUSIVE OF PLATING
4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR
5. MOLD FLASH SHALL NOT EXCEED 0.254mm
6. JEDEC PACKAGE REFERENCE IS MO-193
1.90 BSC
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.
0.30 – 0.45 TYP
5 PLCS (NOTE 3)
0.01 – 0.10
S5 TSOT-23 0302
346812fa
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11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LT3468-2.PDF ] | |
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