LINEAR TECHNOLOGY LT3485-0, LT3485-1, LT3485-2, LT3485-3 Technical data
查询LT3485-0供应商
Monitor and Integrated IGBT Drive
FEATURES
■
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 16V
■
No Output Voltage Divider Needed
■
No External Schottky Diode Required
■
Charges Any Size Photoflash Capacitor
■
Available in 10-Lead (3mm × 3mm) DFN
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*
VIN = V
100µF capacitor, 320V. *50µF capacitor
BAT
= 3.6V
U
APPLICATIO S
■
Digital Camera and Cell Phone Flash Charger
LT3485-0/LT3485-1/
LT3485-2/LT3485-3
Photoflash Capacitor
Chargers with Output Voltage
U
DESCRIPTIO
®
The LT
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
the use of two AA cells to charge the capacitor. The internal
circuitry operates from the VIN 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 respectively. 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.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents including 6636021.
3485 family of photoflash chargers are highly inte-
pin, which allows
BAT
, LTC and LT are registered trademarks of Linear Technology Corporation.
U
TYPICAL APPLICATIO
LT3485-0 Photoflash Charger Uses High Efficiency 3mm Tall Transformers
DANGER HIGH VOLTAGE – OPERATION BY HIGH VOLTAGE TRAINED PERSONNEL ONLY
V
BAT
2 AA OR
1 TO 2 Li-Ion
V
CC
5V
0.22µF
4.7µF
V
BAT
DONE
CHARGE
LT3485-0
V
IN
IGBTPWR
IGBTIN
SW
GND
V
MONT
IGBTOUT
1
2
1:10.2
•
•
4
5
TO
MICRO
320V
150µF
PHOTOFLASH
CAPACITOR
1M
2.2µF
600V
TRIGGER
1
2
3
3485 TA01
T
A
FLASHLAMP
C
IGBT
V
OUT
50V/DIV
AVERAGE
INPUT CURRENT
0.5A/DIV
LT3485-0 Charging Waveform
VIN = 3.6V
= 100µF
C
OUT
1s/DIV
3485 TA02
34850123f
1
LT3485-0/LT3485-1/
LT3485-2/LT3485-3
WW
W
U
ABSOLUTE AXI U RATI GS
(Note 1)
VIN Voltage .............................................................. 10V
Voltage ............................................................ 10V
V
BAT
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
Voltage ......................................................... 10V
MONT
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
UUW
PACKAGE/ORDER I FOR ATIO
TOP VIEW
CHARGE
EXPOSED PAD (11) IS GND, MUST BE SOLDERED TO PCB
1
V
2
BAT
V
IN
SW
SW
10-LEAD (3mm ´ 3mm) PLASTIC DFN
T
11
3
4
5
DD PACKAGE
= 125°C θJA = 43°C/W
JMAX
ORDER PART NUMBER
LT3485EDD-0
LT3485EDD-1
LT3485EDD-2
LT3485EDD-3
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 specified with wider operating temperature ranges.
10
V
MONT
DONE
9
IGBTPWR
8
7
IGBTIN
6
IGBTOUT
DD PART MARKING
LBRH
LBVN
LBVP
LBTK
ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifications are at TA = 25°C. VIN = V
PARAMETER CONDITIONS MIN TYP MAX UNITS
Quiescent Current Not Switching 5 8 mA
VIN Voltage Range
V
Voltage Range
BAT
Switch Current Limit LT3485-3 1.6 1.7 1.8 A
Switch V
CESAT
V
Comparator Trip Voltage Measured as VSW – V
OUT
V
Comparator Overdrive 300ns Pulse Width 200 400 mV
OUT
DCM Comparator Trip Voltage Measured as VSW – V
CHARGE Pin Current V
The ● denotes the specifications which apply over the full operating
= V
BAT
= 0V 0 1 µA
V
CHARGE
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
LT3485-3, I
LT3485-0, I
LT3485-2, I
LT3485-1, I
CHARGE
V
CHARGE
= 1.5A 310 400 mV
SW
= 1A 210 300 mV
SW
= 700mA 170 225 mV
SW
= 400mA 100 175 mV
SW
IN
IN
= 3V 65 100 µA
= 0V 0 0.1 µA
= 3V, unless otherwise noted.
CHARGE
●
●
●
●
2.5 10 V
1.7 10 V
31 31.5 32 V
10 45 120 mV
2
34850123f
LT3485-0/LT3485-1/
LT3485-2/LT3485-3
ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifications are at T
PARAMETER CONDITIONS MIN TYP MAX UNITS
Switch Leakage Current V
CHARGE Input Voltage High
CHARGE Input Voltage Low
Minimum Charge Pin Low Time High→Low→High 20 µs
DONE Output Signal High 100kΩ from VIN to DONE 3 V
DONE Output Signal Low 33µA into DONE Pin 140 200 mV
DONE Leakage Current V
IGBT Input Voltage High
IGBT Input Voltage Low
IGBT Output Rise Time C
IGBT Output Fall Time C
V
Monitor Accuracy SW – V
OUT
Monitor Output Current 200 µA
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
The ● denotes the specifications which apply over the full operating
= 25°C. VIN = V
A
= V
= 5V, in Shutdown
IN
SW
= 3V, DONE NPN Off 20 100 nA
DONE
= 4000pF, IGBTPWR = 5V, 10%→90% 200 270 320 ns
OUT
= 4000pF, IGBTPWR = 5V, 90%→10% 130 180 230 ns
OUT
= 20V 610 625 640 mV
BAT
SW – V
= 30V 920 940 960 mV
BAT
= V
BAT
Note 2: The LTC3485E-X is 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 controls.
= 3V, unless otherwise noted.
CHARGE
●
●
●
●
●
0.01 1 µA
1V
0.3 V
1.5 V
0.3 V
34850123f
3
LT3485-0/LT3485-1/
V
OUT
50V/DIV
0.5s/DIVV
IN
= 3.6V
C
OUT
= 50µF
3485 G03
AVERAGE
INPUT
CURRENT
0.5A/DIV
V
OUT
(V)
0
INPUT CURRENT (mA)
400
500
600
150 250
3485 G06
300
200
50 100
200 300
100
0
2.5V
3.6V
4.2V
V
OUT
(V)
0
0
INPUT CURRENT (mA)
100
300
400
500
200
900
3485 G09
200
100
50
250 300
150
600
700
800
2.5V
3.6V
4.2V
LT3485-2/LT3485-3
UW
TYPICAL PERFOR A CE CHARACTERISTICS
curves use the circuit of Figure 9, LT3485-2 use the circuit of Figure 10 and LT3485-3 use the circuit of Figure 11 unless otherwise noted.
LT3485-0 curves use the circuit of Figure 8, LT3485-1
V
OUT
50V/DIV
AVERAGE
INPUT
CURRENT
1A/DIV
V
OUT
50V/DIV
AVERAGE
INPUT
CURRENT
1A/DIV
LT3485-0 Charging Waveform
C
= 3.6V
IN
OUT
= 50µF
0.5s/DIVV
3485 G01
AVERAGE
CURRENT
LT3485-1 Charging Waveform
V
OUT
50V/DIV
INPUT
0.5A/DIV
C
= 3.6V
IN
OUT
= 50µF
LT3485-3 Charging Waveform Charge Time
6
LT3485-1
5
4
3
2
CHARGE TIME (SECONDS)
1
0
LT3485-0
2
3
C
= 3.6V
IN
OUT
= 50µF
0.5s/DIVV
3485 G04
0.5s/DIVV
C
OUT
LT3485-2
LT3485-3
456
VIN (V)
LT3485-2 Charging Waveform
3485 G02
LT3485-0 Input Current
= 50µF
78
1635 G05
4
LT3485-1 Input Current LT3485-2 Input Current LT3485-3 Input Current
250
200
150
100
INPUT CURRENT (mA)
50
0
050
100
200
150
V
(V)
OUT
250
2.5V
3.6V
4.2V
300
3485 G07
400
300
200
INPUT CURRENT (mA)
100
0
0
50 100 150 200
2.5V
3.6V
4.2V
V
(V)
OUT
250 300
3485 G08
34850123f
LT3485-0/LT3485-1/
V
OUT
(V)
50
40
EFFICIENCY (%)
50
60
70
80
90
100
150 200 250
3485 G12
300
2.5V
3.6V
4.2V
TEMPERATURE (°C)
–40 –20
0
CURRENT LIMIT (mA)
800
2000
0
40
60
3485 G18
400
1600
1200
20
80
100
LT3485-3
LT3485-0
LT3485-2
LT3485-1
LT3485-2/LT3485-3
UW
TYPICAL PERFOR A CE CHARACTERISTICS
curves use the circuit of Figure 9, LT3485-2 use the circuit of Figure 10 and LT3485-3 use the circuit of Figure 11 unless otherwise noted.
LT3485-0 Efficiency LT3485-1 Efficiency LT3485-2 Efficiency
90
90
LT3485-0 curves use the circuit of Figure 8, LT3485-1
80
70
60
EFFICIENCY (%)
50
40
50
100
LT3485-3 Efficiency
90
80
70
60
EFFICIENCY (%)
50
40
50
100
150 200 250
V
(V)
OUT
150 200 250
V
(V)
OUT
2.5V
3.6V
4.2V
300
3485 G10
2.5V
3.6V
4.2V
300
3485 G13
80
70
60
EFFICIENCY (%)
50
40
50
150 200 250
100
V
LT3485-0 Output Voltage
322
321
320
(V)
OUT
V
319
318
317
2
456
3
VIN (V)
OUT
(V)
2.5V
3.6V
4.2V
300
3485 G11
–40°C
25°C
85°C
78
3485 G14
LT3485-1 Output Voltage
322
321
320
(V)
OUT
V
319
318
317
2
456
3
–40°C
25°C
85°C
78
VIN (V)
3485 G15
328
327
326
(V)
325
OUT
V
324
323
322
LT3485-2 Output Voltage LT3485 Switch Current Limits
–40°C
25°C
85°C
2
456
3
VIN (V)
78
3485 G16
LT3485-3 Output Voltage
322
321
320
(V)
OUT
V
319
318
317
2
456
3
VIN (V)
–40°C
25°C
85°C
78
3485 G17
34850123f
5
LT3485-0/LT3485-1/
LT3485-2/LT3485-3
UW
TYPICAL PERFOR A CE CHARACTERISTICS
curves use the circuit of Figure 9, LT3485-2 use the circuit of Figure 10 and LT3485-3 use the circuit of Figure 11 unless otherwise noted.
LT3485-0 curves use the circuit of Figure 8, LT3485-1
LT3485-0 Switching Waveform
V
SW
10V/DIV
I
PRI
1A/DIV
V
= 3.6V
IN
OUT
= 100V
1µs/DIVV
LT3485-3 Switching Waveform
V
SW
10V/DIV
I
PRI
2A/DIV
VIN = 3.6V
= 100V
V
OUT
1µs/DIV
LT3485-2 Switching Waveform
V
SW
10V/DIV
I
PRI
1A/DIV
V
= 3.6V
IN
OUT
= 300V
1µs/DIVV
3485 G19
3485 G22
3485 G25
LT3485-1 Switching Waveform
V
SW
10V/DIV
I
PRI
1A/DIV
= 100V
V
OUT
1µs/DIVVIN = 3.6V
LT3485-0 Switching Waveform
V
SW
10V/DIV
I
PRI
1A/DIV
V
= 3.6V
IN
OUT
= 300V
1µs/DIVV
LT3485-3 Switching Waveform
V
SW
10V/DIV
I
PRI
2A/DIV
VIN = 3.6V
= 300V
V
OUT
1µs/DIV
3485 G26
3485 G20
3485 G23
LT3485-2 Switching Waveform
V
SW
10V/DIV
I
PRI
1A/DIV
V
= 3.6V
IN
OUT
= 100V
1µs/DIVV
LT3485-1 Switching Waveform
V
SW
10V/DIV
I
PRI
1A/DIV
V
= 3.6V
IN
OUT
= 300V
1µs/DIVV
LT3485-0/LT3485-1/LT3485-2/
LT3485-3 Switch Breakdown
Voltage
10
SW PIN IS RESISTIVE UNTIL BREAKDOWN
VOLTAGE DUE TO INTEGRATED
9
RESISTORS. THIS DOES NOT INCREASE
8
QUIESCENT CURRENT OF PART
7
6
5
4
3
SWITCH CURRENT (mA)
2
1
0
0 102030405060708090100
SWITCH VOLTAGE (V)
T = 25°C
T = –40°C
VIN = V
T = 85°C
CHARGE
3485 G21
3485 G24
= 5V
3485 G27
6
34850123f
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