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LT3585EDDB-3#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
LT3585-0/LT3585-1
LT3585-2/LT3585-3
1
3585f
Photofl ash Chargers with
Adjustable Input Current
and IGBT Drivers
The LT
®
3585 series are highly integrated ICs designed to
charge photofl ash capacitors in digital and fi lm cameras.
A new control technique allows for the use of extremely
small transformers. Each part contains an on-chip high
voltage NPN power switch. Output voltage detection is
completely contained within the part, eliminating the need
for any discrete zener diodes or resistors. The output volt-
age can be adjusted by simply changing the turns ratio
of the transformer.
The CHRG/IADJ pin gives full control of the part to the
user. Driving CHRG/IADJ low puts the part in low power
shutdown. The CHRG/IADJ pin can also be used to reduce
the input current of the charger, useful in extending battery
life. The DONE pin indicates when the part has completed
charging.
The LT3585 series of parts are housed in tiny 3mm ×
2mm DFN packages.
■
Digital/Film Camera Flash
■
PDA/Cell Phone Flash
■
Emergency Strobe
■
Adjustable Input Current
■
Integrated IGBT Driver
■
No Output Voltage Divider Needed
■
Uses Small Transformers: 5.8mm × 5.8mm × 3mm
■
Fast Photofl ash Charge Times
■
Charges Any Size Photofl ash Capacitor
■
Supports Operation from Single Li-Ion Cell, Two AA
Cells or any Supply from 1.5V Up to 16V
■
Small 10-Lead (3mm × 2mm) DFN Package
APPLICATIO S
U
FEATURES
DESCRIPTIO
U
TYPICAL APPLICATIO
U
Fast Charge Time
VERSION
INPUT
CURRENT (mA)
NORMAL MODE
CHARGE TIME
(Sec)
REDUCED MODE
CHARGE TIME
(Sec)
LT3585-3 800/400 3.3 6.6
LT3585-0 550/275 4.6 9.2
LT3585-2 400/200 5.8 12.6
LT3585-1* 250/115 5.0 14.6
100µF capacitor, 320V, V
IN
= V
BAT
= 3.6V
*50µF capacitor, 320V, V
IN
= V
BAT
= 3.6V
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
A
C
+
DONE
CHRG/IADJ
V
IN
IGBTPWR
IGBTIN
IGBTPU
IGBTPD
V
BAT
SW
GND
LT3585-1
320V
DANGER HIGH VOLTAGE! OPERATION BY HIGH VOLTAGE TRAINED PERSONNEL ONLY
TO GATE OF IGBT
3585 TA01a
50µF
PHOTOFLASH
CAPACITOR
0.22µF
4.7µF
V
IN
5V
V
BAT
2 AA OR
1 TO 2 Li-Ion
1
2
4
5
1:10:2
20Ω TO
160Ω
•
•
2.2µF
600V
1M
FLASHLAMP
TRIGGER T
1
2
3
LT3585-1 Photofl ash Charger Uses High Effi ciency
2mm Tall Transformers with Tunable IGBT Gate Drive
LT3585-1 Charging Waveform
Normal Input Current Mode
V
OUT
50V/DIV
I
IN
500mA/DIV
1sec/DIV
3585 TA01b
V
BAT
= 3.6V
C
OUT
= 50µF
LT3585-0/LT3585-1
LT3585-2/LT3585-3
2
3585f
V
IN
Voltage ................................................................16V
V
BATT
Voltage ............................................................16V
SW Voltage ...............................................................60V
SW Pin Negative Current ...........................................–1A
CHRG/IADJ Voltage ...................................................10V
IGBTPWR Voltage .....................................................10V
IGBTIN Voltage .........................................................10V
IGBTPU Voltage ........................................................10V
IGBTPD Voltage ........................................................10V
DONE Voltage ...........................................................10V
Current Into DONE Pin ............................... 0.2mA/–1mA
Maximum Junction Temperature .......................... 125°C
Operating Temperature Range (Note 2) ... –40°C to 85°C
Storage Temperature Range ................... –65°C to 125°C
(Note 1)
The
● denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
IN
= V
BAT
= V
CHRG
= 3V unless otherwise noted (Note 2). Specifi cations
are for the LT3585-0, LT3585-1, LT3585-2, LT3585-3 unless otherwise noted.
PARAMETER
CONDITIONS MIN TYP MAX UNITS
Quiescent Current V
CHRG
= 3V, Not Switching
V
CHRG
= 0V, In Shutdown
5
0
8
1
mA
µA
V
IN
Voltage Range
●
2.5 16 V
V
BAT
Voltage Range
●
1.5 16 V
Switch Current Limit LT3585-3 (Note 3)
LT3585-0 (Note 3)
LT3585-2 (Note 3)
LT3585-1 (Note 3)
1.55
1.1
0.75
0.45
1.7
1.2
0.85
0.55
1.85
1.3
0.95
0.65
A
A
A
A
Switch V
CESAT
LT3585-3, I
SW
= 1.4A
LT3585-0, I
SW
= 1A
LT3585-2, I
SW
= 700mA
LT3585-1, I
SW
= 400mA
485
330
230
140
mV
mV
mV
mV
V
OUT
Comparator Trip Voltage Measured as V
SW
– V
BAT
●
31
30.5
31.5
31.5
32
32.5
V
V
V
OUT
Comparator Overdrive 300ns Pulse Width 200 400 mV
DCM Comparator Trip Voltage Measured as V
SW
– V
BAT
80 130 180 mV
CHRG/IADJ Pin Current V
CHRG
= 3V
V
CHRG
= 0V
45
0
70
0.1
µA
µA
Switch Leakage Current V
BAT
= V
SW
= 5V, In Shutdown
●
0.01 1 µA
CHRG/IADJ Minimum Enable Voltage
●
1.1 V
ELECTRICAL CHARACTERISTICS
ABSOLUTE AXI U RATI GS
W
WW
U
PACKAGE/ORDER I FOR ATIO
UUW
TOP VIEW
11
DDB PACKAGE
10-LEAD (3mm × 2mm) PLASTIC DFN
IGBTIN
IGBTPWR
GND
V
IN
V
BAT
IGBTPU
IGBTPD
SW
CHRG/IADJ
DONE
6
8
7
9
10
5
4
2
3
1
T
JMAX
= 125°C, θ
JA
= 76°C/W
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
ORDER PART NUMBER DDB PART MARKING
LT3585EDDB-0
LT3585EDDB-1
LT3585EDDB-2
LT3585EDDB-3
LCLK
LCLJ
LCLH
LCFX
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges.
LT3585-0/LT3585-1
LT3585-2/LT3585-3
3
3585f
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime. Ratings are for DC levels only.
The ● denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
IN
= V
BAT
= V
CHRG
= 3V unless otherwise noted (Note 2). Specifi cations
are for the LT3585-0, LT3585-1, LT3585-2, LT3585-3 unless otherwise noted.
ELECTRICAL CHARACTERISTICS
PARAMETER
CONDITIONS MIN TYP MAX UNITS
CHRG/IADJ Three-State Voltage for Reduced Input
Current
CHRG/IADJ > 1.1V then Float 1.1 1.28 1.4 V
CHRG/IADJ Voltage Range for Normal Input Current
●
1.6 10 V
CHRG/IADJ Low Voltage
●
0.3 V
Delay Time for Reduced Input Current Mode CHRG/IADJ Pin Three Stated:
V
BAT
= 4.2V, Fresh Li-Ion Cell
V
BAT
= 2.8V, Dead Li-Ion Cell
V
BAT
= 3V, Fresh 2 AA Cells
V
BAT
= 2V, Dead 2 AA Cells
5.2
7.2
6.8
9.5
µs
µs
µs
µs
Minimum CHRG/IADJ Pin Low Time High→Low→High 20 µs
DONE Output Signal High 100kΩ from V
IN
to DONE 3 V
DONE Output Signal Low 33µA into DONE Pin 120 200 mV
DONE Leakage Current V
DONE
= 3V, DONE NPN Off 1 100 nA
IGBTPWR Voltage Range
●
2.5 10 V
IGBT Input High Level
●
1.5 V
IGBT Input Low Level
●
0.5 V
IGBT Output Rise Time IGBTPU Pin, C
OUT
= 4000pF,
IGBTPWR = 5V, IGBTIN = 0V→1.5V, 10%→90%
0.4 µs
IGBT Output Fall Time IGBTPD Pin, C
OUT
= 4000pF,
IGBTPWR = 5V, IGBTIN = 1.5V→0V, 90%→10%
0.13 µs
Note 2: The LT3585 series is guaranteed to meet performance
specifi cations from 0°C to 85°C. Specifi cations over the –40°C to 85°C
operating temperature range are assured by design, characterization and
correlation with statistical process controls.
Note 3: Current limit is guaranteed by design and/or correlation to static
test.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20

LT3585EDDB-3#TRPBF

Mfr. #:
Buy LT3585EDDB-3#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Power Management Specialized - PMIC Photoflash Chr w/ Adj In C & IGBT Drvr
Lifecycle:
New from this manufacturer.
Delivery:
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