IC PHOTOFLASH CAP CHARGER 6-DFN

LT3484EDCB-0#TRM

Manufacturer Part NumberLT3484EDCB-0#TRM
DescriptionIC PHOTOFLASH CAP CHARGER 6-DFN
ManufacturerLinear Technology
LT3484EDCB-0#TRM datasheet
 


Specifications of LT3484EDCB-0#TRM

ApplicationsPhotoflash Capacitor ChargerCurrent - Supply5mA
Voltage - Supply1.7 V ~ 16 VOperating Temperature-40°C ~ 85°C
Mounting TypeSurface MountPackage / Case6-DFN
Lead Free Status / RoHS StatusContains lead / RoHS non-compliantOther namesLT3484EDCB-0
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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, V
5.7s for LT3484-2 (0V to 320V, 100µF, V
5.5s for LT3484-1 (0V to 320V, 50µF, V
■
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
U
TYPICAL APPLICATIO
LT3484-0 Photoflash Charger Uses
High Efficiency 3mm Tall Transformers
DANGER HIGH VOLTAGE – OPERATION BY HIGH VOLTAGE
TRAINED PERSONNEL ONLY
1:10.2
V
BAT
2AA OR
1
1 TO 2 Li-Ion
4.7µF
2
SW
V
BAT
V
CC
V
IN
5V
0.1µF
LT3484-0
100k
GND
DONE
CHARGE
LT3484-0/LT3484-1/LT3484-2
Photoflash Capacitor
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-
= 3.6V)
IN
tion size. Output voltage detection requires no external
= 3.6V)
IN
= 3.6V)
circuitry as the transformer turns ratio determines final
IN
charge voltage.
The devices feature a V
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.
320V
4
5
+
150µF
50V/DIV
PHOTOFLASH
CAPACITOR
AVERAGE
CURRENT
1A/DIV
348412 TA01
Chargers
U
pin, which allows the use of 2
BAT
LT3484-0 Charging Waveform
V
= 3.6V
IN
C
= 100µF
OUT
V
OUT
INPUT
1s/DIV
3484 TA02
3484012f
1

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LT3484EDCB-0#TRM Summary of contents

  • Page 1

    ... 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. ...

  • Page 2

    ... EXPOSED PAD (PIN 7) IS GND, MUST BE SOLDERED TO PCB ORDER PART NUMBER LT3484EDCB-0 LT3484EDCB-1 LT3484EDCB-2 Order Options Tape and Reel: Add #TR Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF Lead Free Part Marking: Consult LTC Marketing for parts specified with wider operating temperature ranges. ...

  • Page 3

    W U TYPICAL PERFOR A CE CHARACTERISTICS LT3484-1 curves use the circuit of Figure 7 and LT3484-2 use the circuit of Figure 8, T LT3484-0 Charging Waveform 100µF OUT V OUT 50V/DIV AVERAGE INPUT ...

  • Page 4

    LT3484-0/LT3484-1/LT3484 TYPICAL PERFOR A CE CHARACTERISTICS LT3484-1 curves use the circuit of Figure 7 and LT3484-2 use the circuit of Figure 8, T LT3484-0 Switch Current Limit 1.5 1.4 1.3 1.2 1.1 – 40 – ...

  • Page 5

    W U TYPICAL PERFOR A CE CHARACTERISTICS LT3484-1 curves use the circuit of Figure 7 and LT3484-2 use the circuit of Figure 8, T LT3484-0 Switching Waveform 100V OUT V SW 10V/DIV I PRI ...

  • Page 6

    LT3484-0/LT3484-1/LT3484 CTIO S DONE (Pin 1): Open NPN Collector Indication Pin. When target output voltage is reached, NPN turns on, pulling Pin 1 low. This pin needs a pull-up resistor or current source. CHARGE (Pin ...

  • Page 7

    U OPERATIO The LT3484-0/LT3484-1/LT3484-2 are designed to charge photoflash capacitors quickly and efficiently. The opera- tion of the part can be best understood by referring to Figure 1. When the CHARGE pin is first driven high, a one shot sets ...

  • Page 8

    ... SW pin, the parasitic capacitance of the transformer would become large. This will adversely affect the charge time of the photoflash circuit. Linear Technology has worked with several leading mag- netic component manufacturers to produce pre-designed flyback transformers for use with the LT3484-0/ LT3484-1/LT3484-2 ...

  • Page 9

    U U APPLICATIO S I FOR ATIO 320V OUT V SW 10V/DIV 100ns/DIV Figure 3. LT3484-0 SW Voltage Waveform Table 2. Pre-Designed Transformers – Typical Specifications Unless Otherwise Noted FOR USE WITH TRANSFORMER NAME ...

  • Page 10

    LT3484-0/LT3484-1/LT3484 APPLICATIO S I FOR ATIO Table 3. Recommended Output Diodes MAX REVERSE VOLTAGE MAX FORWARD CONTINUOUS CURRENT PART (V) GSD2004S 2x300 (Dual Diode) BAV23S 2x250 (Dual Diode) MMBD3004S 2x350 (Dual Diode) Board Layout The high voltage operation ...

  • Page 11

    ... RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS 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. ...

  • Page 12

    ... Multi-Phase Synchronous Step-Up DC/DC SW Converter LTC3440 600mA (I ), 2MHz, Synchronous Buck-Boost DC/DC OUT Converter LT3468/LT3468-1/ 1.4A/0.7A/1A Photoflash Capacitor Chargers in ThinSOT™ LT3468-2 ThinSOT is a trademark of Linear Technology Corporation. Linear Technology Corporation 12 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 ● 1:10.4 320V ...

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