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LT3485EDD-1#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
LT3485-0/LT3485-1/
LT3485-2/LT3485-3
1
34850123fb
FEATURES
DESCRIPTIO
U
Photoflash Capacitor
Chargers with Output Voltage
Monitor and Integrated IGBT Drive
TYPICAL APPLICATIO
U
■
Integrated IGBT Driver
■
Voltage Output Monitor
■
Uses Small Transformers: 5.8mm × 5.8mm × 3mm
■
Operates from Two AA Batteries, Single Cell Li-Ion
or Any Supply from 1.8V up to 10V
■
No Output Voltage Divider Needed
■
No External Schottky Diode Required
■
Charges Any Size Photoflash Capacitor
■
Available in 10-Lead (3mm × 3mm) DFN
APPLICATIO S
U
■
Digital Camera and Cell Phone Flash Charger
The LT
®
3485 family of photoflash chargers are highly inte-
grated ICs containing complete charger and IGBT drive
functions. The patented control technique of the LT3485-x
allows it to use extremely small transformers. Output voltage
detection requires no external circuitry. The turns ratio of the
transformer controls the final charge voltage. While charging,
the output voltage on the capacitor may be monitored by a
microcontroller from the monitor pin. Each device contains an
on-chip high voltage NPN power switch, which can withstand
negative voltages on the switch pin without an external
Schottky diode. The device features a V
BAT
pin, which allows
the use of two AA cells to charge the capacitor. The internal
circuitry operates from the V
IN
pin. The LT3485-0 has a
primary current limit of 1.4A, whereas the LT3485-3, LT3485-2,
and LT3485-1 have current limits of 2A, 1A and 0.7A respec-
tively. These different current limits result in tightly controlled
input currents.
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 LT3485
series of parts are housed in a leadless (3mm × 3mm) DFN
package.
Fast Charge Time
VERSION INPUT CURRENT (mA) CHARGE TIME (sec)
LT3485-3 750 2.5
LT3485-0 500 3.7
LT3485-2 350 5.5
LT3485-1 225 4.0*
V
IN
= V
BAT
= 3.6V
100µF capacitor, 320V. *50µF capacitor
LT3485-0
IGBTOUT
IGBTIN
V
IN
IGBTPWR
GND
V
MONT
V
BAT
SW
4.7µF
1:10.2
•
•
V
BAT
2 AA OR
1 TO 2 Li-Ion
0.22µF
V
CC
5V
320V
TO
MICRO
1
T
C
A
2
3
1
2
4
5
3485 TA01
150µF
PHOTOFLASH
CAPACITOR
2.2µF
600V
1M
CHARGE
DONE
TRIGGER
FLASHLAMP
IGBT
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents including 6636021.
LT3485-0 Charging Waveform
LT3485-0 Photoflash Charger Uses High Efficiency 3mm Tall Transformers
DANGER HIGH VOLTAGE – OPERATION BY HIGH VOLTAGE TRAINED PERSONNEL ONLY
V
IN
= 3.6V
C
OUT
= 100µF
V
OUT
50V/DIV
AVERAGE
INPUT CURRENT
0.5A/DIV
1s/DIV
3485 TA02
LT3485-0/LT3485-1/
LT3485-2/LT3485-3
2
34850123fb
V
IN
Voltage .............................................................. 10V
V
BAT
Voltage ............................................................ 10V
SW Voltage ................................................... –1V to 50V
SW Pin Negative Current ...................................... –0.5A
CHARGE Voltage...................................................... 10V
IGBTIN Voltage ........................................................ 10V
IGBTOUT Voltage ..................................................... 10V
DONE Voltage .......................................................... 10V
IGBTPWR Voltage.................................................... 10V
V
MONT
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
ABSOLUTE AXI U RATI GS
W
WW
U
(Note 1)
PARAMETER CONDITIONS MIN TYP MAX UNITS
Quiescent Current Not Switching 5 8 mA
V
CHARGE
= 0V 0 1 µA
V
IN
Voltage Range ● 2.5 10 V
V
BAT
Voltage Range ● 1.7 10 V
Switch Current Limit LT3485-3 1.6 1.7 1.8 A
LT3485-0 1.1 1.2 1.3 A
LT3485-2 0.75 0.85 0.95 A
LT3485-1 0.45 0.55 0.65 A
Switch V
CESAT
LT3485-3, I
SW
= 1.5A 310 400 mV
LT3485-0, I
SW
= 1A 210 300 mV
LT3485-2, I
SW
= 700mA 170 225 mV
LT3485-1, I
SW
= 400mA 100 175 mV
V
OUT
Comparator Trip Voltage Measured as V
SW
– V
IN
● 31 31.5 32 V
V
OUT
Comparator Overdrive 300ns Pulse Width 200 400 mV
DCM Comparator Trip Voltage Measured as V
SW
– V
IN
● 10 45 120 mV
CHARGE Pin Current V
CHARGE
= 3V 65 100 µA
V
CHARGE
= 0V 0 0.1 µA
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= V
BAT
= V
CHARGE
= 3V, unless otherwise noted.
PACKAGE/ORDER I FOR ATIO
UUW
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ORDER PART NUMBER
LT3485EDD-0
LT3485EDD-1
LT3485EDD-2
LT3485EDD-3
T
JMAX
= 125°C θ
JA
= 43°C/W
EXPOSED PAD (11) IS GND, MUST BE SOLDERED TO PCB
TOP VIEW
11
DD PACKAGE
10-LEAD (3mm 3mm) PLASTIC DFN
10
9
6
7
8
4
5
3
2
1
V
MONT
DONE
IGBTPWR
IGBTIN
IGBTOUT
CHARGE
V
BAT
V
IN
SW
SW
DD PART MARKING
LBRH
LBVN
LBVP
LBTK
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/
LT3485-0/LT3485-1/
LT3485-2/LT3485-3
3
34850123fb
PARAMETER CONDITIONS MIN TYP MAX UNITS
Switch Leakage Current V
IN
= V
SW
= 5V, in Shutdown ● 0.01 1 µA
CHARGE Input Voltage High ● 1V
CHARGE Input Voltage Low ● 0.3 V
Minimum Charge 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 140 200 mV
DONE Leakage Current V
DONE
= 3V, DONE NPN Off 20 100 nA
IGBT Input Voltage High ● 1.5 V
IGBT Input Voltage Low ● 0.3 V
IGBT Output Rise Time C
OUT
= 4000pF, IGBTPWR = 5V, 10%→90% 450 ns
IGBT Output Fall Time C
OUT
= 4000pF, IGBTPWR = 5V, 90%→10% 340 ns
V
OUT
Monitor Accuracy SW – V
BAT
= 20V 610 625 640 mV
SW – V
BAT
= 30V 920 940 960 mV
Monitor Output Current 200 µA
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= V
BAT
= V
CHARGE
= 3V, unless otherwise noted.
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.
Note 2: The LTC3485E-X is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20

LT3485EDD-1#PBF

Mfr. #:
Buy LT3485EDD-1#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators Photoflash Cap Chrs w/ Out V Mon & Int
Lifecycle:
New from this manufacturer.
Delivery:
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