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LT3468ES5-1#TRMPBF

P1-P3P4-P6P7-P9P10-P12
LT3468/LT3468-1/LT3468-2
1
346812fa
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
■
Digital / Film Camera Flash
■
PDA / Cell Phone Flash
■
Emergency Strobe
■
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, V
IN
= 3.6V)
5.7s for LT3468-2 (0V to 320V, 100µF, V
IN
= 3.6V)
5.5s for LT3468-1 (0V to 320V, 50µF, V
IN
= 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
Photoflash Capacitor
Chargers in ThinSOT
TM
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.
DANGER HIGH VOLTAGE – OPERATION BY HIGH VOLTAGE
TRAINED PERSONNEL ONLY
LT3468 Photoflash Charger Uses
High Efficiency 4mm Tall Transformer
LT3468
CHARGE
GND
V
IN
SW
+
DONE DONE
CHARGE
4.7µF
100k
1:10.2
V
IN
2.5V TO 8V
320V
1
2
4
5
346812 TA01
100µF
LT3468 Charging Waveform
3468 G01
1s/DIV
V
IN
= 3.6V
C
OUT
= 100µF
V
OUT
50V/DIV
AVERAGE
INPUT
CURRENT
1A/DIV
TYPICAL APPLICATIO
U
, 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.
LT3468/LT3468-1/LT3468-2
2
346812fa
V
IN
Voltage .............................................................. 16V
SW Voltage ................................................ –0.4V to 50V
CHARGE Voltage...................................................... 10V
DONE Voltage .......................................................... 10V
Current into DONE Pin .......................................... ±1mA
Maximum Junction Temperature .......................... 125°C
Operating Temperature Range (Note 2) ...–40°C to 85°C
Storage Temperature Range ..................–65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
ORDER PART
NUMBER
S5 PART
MARKING
T
JMAX
= 125°C
θ
JA
= 150°C ON BOARD OVER
GROUND PLANE
θ
JC
= 90°C/W
LTAEC
LTAGQ
LTBCH
LT3468ES5
LT3468ES5-1
LT3468ES5-2
ABSOLUTE AXI U RATI GS
W
WW
U
PACKAGE/ORDER I FOR ATIO
UUW
(Note 1)
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 3V, V
CHARGE
= V
IN
unless otherwise noted. (Note 2) Specifications
are for the LT3468, LT3468-1 and LT3468-2 unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Quiescent Current Not Switching 5 8 mA
V
CHARGE
= 0V 0 1 µA
Input Voltage Range ● 2.5 16 V
Switch Current Limit LT3468 (Note 3) 1.1 1.2 1.3 A
LT3468-2 0.77 0.87 0.97 A
LT3468-1 0.45 0.55 0.65 A
Switch V
CESAT
LT3468, I
SW
= 1A 330 430 mV
LT3468-2, I
SW
= 650mA 210 280 mV
LT3468-1, I
SW
= 400mA 150 200 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 36 80 mV
CHARGE Pin Current V
CHARGE
= 3V 15 40 µA
V
CHARGE
= 0V 0 0.1 µA
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 100 200 mV
DONE Leakage Current V
DONE
= 3V, DONE NPN Off 20 100 nA
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LT3468E/LT3468E-1/LT3468E-2 are guaranteed to meet
performance specifications from 0°C to 70°C. Specifications over the
–40°C to 85°C operating temperature range are assured by design,
characterization and correlation with statistical process.
Note 3: Specifications are for static test. Current limit in actual application
will be slightly higher.
5 VIN
4 CHARGE
SW 1
TOP VIEW
S5 PACKAGE
5-LEAD PLASTIC TSOT-23
GND 2
DONE 3
LT3468/LT3468-1/LT3468-2
3
346812fa
LT3468-1 Charge Time
LT3468-1 Charging Waveform
LT3468 Input Current LT3468-1 Input Current
LT3468 Charging Waveform
LT3468 Charge Time
V
IN
(V)
23456789
CHARGE TIME (s)
3468 G04
10
9
8
7
6
5
4
3
2
1
0
C
OUT
= 50µF
C
OUT
= 100µF
T
A
= 25°C
V
IN
(V)
23456789
CHARGE TIME (s)
3468 G05
10
9
8
7
6
5
4
3
2
1
0
C
OUT
= 20µF
C
OUT
= 50µF
T
A
= 25°C
V
OUT
(V)
0 50 100 150 200 250 300
AVERAGE INPUT CURRENT (mA)
3468 G07
800
0
200
400
600
V
IN
= 2.8V
V
IN
= 4.2V
V
IN
= 3.6V
T
A
= 25°C
V
OUT
(V)
0 50 100 150 200 250 300
AVERAGE INPUT CURRENT (mA)
3468 G08
400
0
100
200
300
V
IN
= 2.8V
V
IN
= 4.2V
V
IN
= 3.6V
T
A
= 25°C
V
IN
= 3.6V
C
OUT
= 50µF
3468 G01
3468 G02
TYPICAL PERFOR A CE CHARACTERISTICS
UW
1s/DIV
V
IN
= 3.6V
C
OUT
= 100µF
V
OUT
50V/DIV
1s/DIV
AVERAGE
INPUT
CURRENT
1A/DIV
V
OUT
50V/DIV
AVERAGE
INPUT
CURRENT
0.5A/DIV
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.
V
IN
= 3.6V
C
OUT
= 100µF
V
OUT
50V/DIV
AVERAGE
INPUT
CURRENT
0.5A/DIV
1s/DIV
3468 G03
V
IN
(V)
2
CHARGE TIME (s)
10
9
8
7
6
5
4
3
2
1
0
4
6
7
3468 G06
3
5
8
9
C
OUT
= 100µF
C
OUT
= 50µF
T
A
= 25°C
V
OUT
(V)
0 50 100 150 200 250 300
AVERAGE INPUT CURRENT (mA)
3468 G09
600
0
150
300
450
V
IN
= 2.8V
V
IN
= 4.2V
V
IN
= 3.6V
T
A
= 25°C
LT3468-2 Charge Time
LT3468-2 Charging Waveform
LT3468-2 Input Current
P1-P3P4-P6P7-P9P10-P12

LT3468ES5-1#TRMPBF

Mfr. #:
Buy LT3468ES5-1#TRMPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 225mA Photoflash Capacitor Charger
Lifecycle:
New from this manufacturer.
Delivery:
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