LT3585-0 LINER
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Technical content
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 SU 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 = VBAT = 3.6V *50µF capacitor, 320V, VIN = VBAT = 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 VIN VBAT
2 AA OR
1 TO 2 Li-Ion 1
1:10:2 20Ω TO 160Ω
- 2.2µF 600V FLASHLAMP TRIGGER T 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 VOUT 50V/DIV IIN 500mA/DIV 1sec/DIV
3585 TA01b
VBAT = 3.6V COUT = 50µF
Operating Temperature Range (Note 2) ... –40°C to 85°C (Note 1) The ● denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TA = 25°C. VIN = VBAT = VCHRG = 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 VCHRG = 0V, In Shutdown mA µA V IN Voltage Range ● 2.5 16 V VBAT 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, ISW = 1.4A LT3585-0, ISW = 1A LT3585-2, ISW = 700mA LT3585-1, ISW = 400mA 485 330 230 140 mV mV mV mV V OUT Comparator Trip Voltage Measured as V SW – VBAT 30.5 31.5 31.5 32.5 V V V OUT Comparator Overdrive 300ns Pulse Width 200 400 mV DCM Comparator Trip Voltage Measured as V SW – VBAT 80 130 180 mV CHRG/IADJ Pin Current V CHRG = 3V VCHRG = 0V 0.1 µA µA Switch Leakage Current V BAT = VSW = 5V, In Shutdown ● 0.01 1 µA CHRG/IADJ Minimum Enable Voltage ● 1.1 V
ELECTRICAL CHARACTERISTICS
ABSOLUTE AXI U RATI GSW WW U PACKAGE/ORDER I FOR ATIOUU W TOP VIEW DDB PACKAGE 10-LEAD (3mm × 2mm) PLASTIC DFN IGBTIN IGBTPWR GND VIN VBAT IGBTPU IGBTPD SW CHRG/IADJ DONE6 TJMAX = 125°C, θJA = 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.
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 TA = 25°C. VIN = VBAT = VCHRG = 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 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: VBAT = 4.2V, Fresh Li-Ion Cell VBAT = 2.8V, Dead Li-Ion Cell VBAT = 3V, Fresh 2 AA Cells VBAT = 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 100k Ω 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.
TYPICAL PERFOR A CE CHARACTERISTICS UW LT3585-0 Charging Waveform Normal Input Current Mode LT3585-1 Charging Waveform Normal Input Current Mode LT3585-2 Charging Waveform Normal Input Current Mode LT3585-0 curves use Figure 11, LT3585-1 curves use Figure 12, LT3585-2 curves use Figure 13 and LT3585-3 curves use Figure 14 unless otherwise noted. VOUT 50V/DIV 0.5s/DIV
3585 G01
VBAT = 3.6V COUT = 50µF AVERAGE INPUT CURRENT 1A/DIV VOUT 50V/DIV 2s/DIV
3585 G02
VBAT = 3.6V COUT = 50µF AVERAGE INPUT CURRENT 500mA/DIV VOUT 50V/DIV 1s/DIV
3585 G03
VBAT = 3.6V COUT = 50µF AVERAGE INPUT CURRENT 1A/DIV LT3585-3 Charging Waveform Normal Input Current Mode LT3585-0 Charging Waveform Reduced Input Current Mode LT3585-1 Charging Waveform Reduced Input Current Mode VOUT 50V/DIV 0.5s/DIV
3585 G04
VBAT = 3.6V COUT = 50µF AVERAGE INPUT CURRENT 1A/DIV VOUT 50V/DIV 0.5s/DIV
3585 G05
VBAT = 3.6V COUT = 50µF AVERAGE INPUT CURRENT 1A/DIV VOUT 50V/DIV 2s/DIV
3585 G06
VBAT = 3.6V COUT = 50µF AVERAGE INPUT CURRENT 500mA/DIV LT3585-2 Charging Waveform Reduced Input Current Mode LT3585-3 Charging Waveform Reduced Input Current Mode Charge Time* Normal Input Current Mode VOUT 50V/DIV 1s/DIV
3585 G07
VBAT = 3.6V COUT = 50/K6D F AVERAGE INPUT CURRENT 1A/DIV VOUT 50V/DIV 0.5s/DIV
3585 G08
VBAT = 3.6V COUT = 50µF AVERAGE INPUT CURRENT 1A/DIV VBAT (V) CHARGE TIME (SECONDS)
3585 G09
*USING RUBYCON 330V, 50µF PHOTOFLASH OUTPUT CAPACITOR (FW SERIES) 83 5 7 9 LT3585-0 LT3585-1 LT3585-2 LT3585-3
TYPICAL PERFOR A CE CHARACTERISTICS UW LT3585-0 curves use Figure 11, LT3585-1 curves use Figure 12, LT3585-2 curves use Figure 13 and LT3585-3 curves use Figure 14 unless otherwise noted. Charge Time* Reduced Input Current Mode LT3585-0 Input Current Normal Input Current Mode LT3585-1 Input Current Normal Input Current Mode LT3585-2 Input Current Normal Input Current Mode LT3585-3 Input Current Normal Input Current Mode LT3585-0 Input Current Reduced Input Current Mode LT3585-1 Input Current Reduced Input Current Mode LT3585-2 Input Current Reduced Input Current Mode LT3585-3 Input Current Reduced Input Current Mode VBAT (V) CHARGE TIME (SECONDS) 57 1 0
3585 G10
*USING RUBYCON 330V, 50µF PHOTOFLASH OUTPUT CAPACITOR (FW SERIES) LT3585-0 LT3585-1 LT3585-2 LT3585-3 VOUT (V) 400 500 700
3585 G11
600INPUT CURRENT (mA) VBAT = 4.2V VBAT = 3.6V VBAT = 2.5V VOUT (V) 200 250 300
3585 G12
INPUT CURRENT (mA) VBAT = 4.2V VBAT = 3.6V VBAT = 2.5V VOUT (V) 200 250 450
3585 G13
300INPUT CURRENT (mA) VBAT = 4.2V VBAT = 3.6V VBAT = 2.5V VOUT (V) 400 500 900
3585 G14
600INPUT CURRENT (mA) VBAT = 4.2V VBAT = 3.6V VBAT = 2.5V VOUT (V) 200 250 350
3585 G15
300INPUT CURRENT (mA) VBAT = 4.2V VBAT = 3.6V VBAT = 2.5V VOUT (V) 100 120
3585 G16
INPUT CURRENT (mA) VBAT = 4.2V VBAT = 3.6V VBAT = 2.5V VOUT (V) 200 250
3585 G17
INPUT CURRENT (mA) VBAT = 4.2V VBAT = 3.6V VBAT = 2.5V VOUT (V) 200 250 500 450
3585 G18
300INPUT CURRENT (mA) VBAT = 4.2V VBAT = 3.6V VBAT = 2.5V
LT3585-0 Effi ciency Normal Input Current Mode TYPICAL PERFOR A CE CHARACTERISTICS UW LT3585-0 curves use Figure 11, LT3585-1 curves use Figure 12, LT3585-2 curves use Figure 13 and LT3585-3 curves use Figure 14 unless otherwise noted. VOUT (V) EFFICIENCY (%) 100 150 200 250
3585 G19
VBAT = 4.2V VBAT = 3.6V VBAT = 2.5V USING KIJIMA SBL-5.6-1 TRANSFORMER VOUT (V) EFFICIENCY (%) 100 150 200 250 VBAT = 4.2V VBAT = 3.6V VBAT = 2.5V USING KIJIMA SBL-5.6S-1 TRANSFORMER VOUT (V) EFFICIENCY (%) 100 150 200 250
3585 G21
VBAT = 4.2V VBAT = 3.6V VBAT = 2.5V USING KIJIMA SBL-5.6-1 TRANSFORMER LT3585-1 Effi ciency Normal Input Current Mode LT3585-2 Effi ciency Normal Input Current Mode LT3585-3 Effi ciency Normal Input Current Mode LT3585-0 Effi ciency Reduced Input Current Mode LT3585-1 Effi ciency Reduced Input Current Mode VOUT (V) EFFICIENCY (%) 100 150 200 250
3585 G23
VBAT = 4.2V VBAT = 3.6V VBAT = 2.5V USING KIJIMA SBL-5.6-1 TRANSFORMER VOUT (V) EFFICIENCY (%) 100 150 200 250
3585 G24
VBAT = 4.2V VBAT = 3.6V VBAT = 2.5V USING KIJIMA SBL-5.6S-1 TRANSFORMER LT3585-2 Effi ciency Reduced Input Current Mode LT3585-3 Effi ciency Reduced Input Current Mode LT3585-0 Output Voltage VOUT (V) EFFICIENCY (%) 100 150 200 250
3585 G25
VBAT = 4.2V VBAT = 3.6V VBAT = 2.5V USING KIJIMA SBL-5.6-1 TRANSFORMER VBAT (V)
322 VOUT (V)
3585 G27
TA = –40°C TA = 25°C TA = 85°C VOUT (V) EFFICIENCY (%) 100 150 200 250
3585 G22
VBAT = 4.2V VBAT = 3.6V VBAT = 2.5V USING TDK LDT565630T-041 TRANSFORMER VOUT (V) EFFICIENCY (%) 100 150 200 250
3585 G26
VBAT = 4.2V VBAT = 3.6V VBAT = 2.5V USING TDK LDT565630T-041 TRANSFORMER
LT3585-1 Output Voltage LT3585-2 Output Voltage LT3585-3 Output Voltage LT3585-0 Switch Waveform Normal Input Current Mode TYPICAL PERFOR A CE CHARACTERISTICS UW LT3585-0 curves use Figure 11, LT3585-1 curves use Figure 12, LT3585-2 curves use Figure 13 and LT3585-3 curves use Figure 14 unless otherwise noted. VBAT (V)
310 VOUT (V)
3585 G28
TA = –40°C TA = 25°C TA = 85°C VBAT (V)
314 VOUT (V)
3585 G29
TA = –40°C TA = 25°C TA = 85°C VBAT (V)
320 VOUT (V)
3585 G30
TA = –40°C TA = 25°C TA = 85°C VSW 10V/DIV IPRI 1A/DIV 2µs/DIV
3585 G31
VBAT = 3.6V VOUT = 100V LT3585-0 Switch Waveform Reduced Input Current Mode VSW 10V/DIV IPRI 1A/DIV 2µs/DIV
3585 G32
VBAT = 3.6V VOUT = 100V LT3585-0 Switch Waveform Normal Input Current Mode VSW 10V/DIV IPRI 1A/DIV 2µs/DIV
3585 G33
VBAT = 3.6V VOUT = 300V LT3585-0 Switch Waveform Reduced Input Current Mode Switch DC Current Limit* LT3585-0/LT3585-1/LT3585-2/ LT3585-3 Switch Breakdown Voltage VSW 10V/DIV IPRI 1A/DIV 2µs/DIV
3585 G34
VBAT = 3.6V VOUT = 300V TEMPERATURE (°C) –50 CURRENT LIMIT (A) 0.3 0.6 0.9 1.2 –10 20 *DYNAMIC CURRENT LIMIT IS HIGHER THAN DC CURRENT LIMIT 6040 80
3585 G35
1.5 1.8 –30 10 30 LT3585-3 LT3585-0 LT3585-2 LT3585-1 SWITCH VOLTAGE (V) SWITCH CURRENT (mA)
3585 G36
TA = –40°C TA = 25°C TA = 85°C SW PIN IS RESISTIVE UNTIL BREAKDOWN VOLTAGE DUE TO INTEGRATED RESISTORS. THIS DOES NOT INCREASE QUIESCENT CURRENT OF THE PART
IGBTIN (Pin 1): Logic Input for the IGBT Driver. When this pin is driven higher than 1.5V, the output goes high. When the pin is below 0.5V, the output will go low. IGBTPWR (Pin 2): Supply Pin for the IGBT Driver. Must be locally bypassed with a good quality ceramic capacitor. The minimum operating voltage for the IGBT driver is 2.5V. GND (Pin 3): Ground. Tie directly to local ground plane. VIN (Pin 4): Input Supply Pin. Must be locally bypassed with a good quality ceramic capacitor. The minimum operating voltage for VIN is 2.5V. VBAT (Pin 5): Battery Supply Pin. Must be locally bypassed with a good quality ceramic capacitor. The minimum operating voltage for V BAT is 1.5V. DONE (Pin 6): Open NPN Collector Indication Pin. When target output voltage is reached, NPN turns on. This pin needs a proper pull-up resistor or current source. CHRG/IADJ (Pin 7): Charge and Input Current Adjust Pin. A low (<0.3V) to high (>1.1V) transition on this pin puts the part into power delivery mode. Once the target output voltage is reached, the part will stop charging the output. Toggle this pin to start charging again. Ground to shut down. To enter into the input current reduction mode, the voltage on this pin should be driven high ( >1.1V ) and then fl oated. (For more information refer to the Operation section of this data sheet.) To enter normal mode, the voltage should be driven higher than 1.6V. SW (Pin 8): Switch Pin. This is the collector of the internal NPN Power switch. Minimize the metal trace area connected to this pin to minimize EMI. Tie one side of the primary of the transformer to this pin. The target output voltage is set by the turns ratio of the transformer. Choose turns ratio N by the following equation: N VOUT= + 2 31 5. where VOUT is the desired output voltage. IGBTPD (Pin 9): Pull-down Output for IGBT Gate. Connect this pin to the IGBT Gate. Add a series resistor to increase the turn-off time to protect the IGBT. IGBTPU (Pin 10): Pull-up Output for IGBT Gate. Connect this pin to the gate of the IGBT. Exposed Pad (Pin 11): Ground. Tie directly to local ground plane.
SI PLIFIEDW BLOCK DIAGRA W –+– + 1.25V REFERENCE VARIABLE DELAY SWITCH LATCH RESET DOMINANT S DRIVER 20mV RQVOUT COMPARATOR DCM COMPARATOR ENABLEMASTER LATCH CHRG/IADJ UVLO UVLO 2.5V MAX VBAT 1.5V MAX CHIP POWER A5 A4 QQ RS ONE SHOT IGBT DRIVE CIRCUITRY 2.5k 60k VIN VIN TO BATTERY DONE IGBTPWR IGBTIN SW VOUT SECONDARY PRIMARY RM LT3585-3, RM = 12mΩ LT3585-0, RM = 17mΩ LT3585-2, RM = 24mΩ LT3585-1, RM = 36mΩ 130mV GND 3 IGBTPU 10 IGBTPD
3585 F01
latch resets and the DONE pin goes low. reduced by changing the voltage of the CHRG/IADJ pin. as place the part into the input current reduction mode. sheet suggest values adequate for most applications. The LT3585 series also includes an integrated IGBT driver. down the turn off of the IGBT.
3585 F02
Figure 3. Basic OperationFigure 2. Normal and Reduced Input Current Waveforms
3585 F03
has adequate time to respond to the fl yback waveform. which assumes that the current in the power NPN is zero. Table 1. Recommended Transformer Parameters
Table 2 shows the details of several of these transformers.
3585 F05
Figure 4. LT3585 SW Voltage Waveform Figure 5. New Transformer Design Check Table 2. Predesigned Transformers—Typical Specifi cations Unless Otherwise Noted
400 Max
200 Max
390 Max
500 Max
550 Max
150 Max
370 Max
100 Max
240 Max
210 Max
90 Max
11.2 Max
10 Max
16.5 Max
14 Max
6.4 Max
300 Max
128 Max
515 Max
256 Max
102 Max
28 Max
32 Max
37 Max
16 Max
3585 F04
Figure 6. IGBT Driver Output with 4000pF Load Figure 7. IGBT Turn-Off Delay vs RPD Table 3. Recommended Output Diodes resistor placed in series with the IGBTPD pin.
3585 F06
3585 F07
Table 4. Recommended IGBTs *Packaged in 8-lead VSON-8 pacakge. Figure 8. Complete Xenon Circuit
3585 F09
Figure 9. IGBT Gate to drop to approximately 0.1µA during idle conditions. 8-lead TSSOP packages unless otherwise noted.
3585 F08
1 TO 2 Li-Ion
- C4 2.2/K6D F 600V FLASHLAMP TRIGGER T
Figure 10. LT3585 Suggested Layout the device’s operating temperature.
3585 F10
Figure 11. LT3585-0 Photofl ash Charger Uses High Effi ciency 3mm Tall Transformer
3585 F11
Figure 12. LT3585-1 Photofl ash Charger Uses High Effi ciency 2mm Tall Transformer
3585 F12
Figure 13. LT3585-2 Uses High Effi ciency 3mm Tall Transformers
3585 F13
3585 F14
Figure 14. LT3585-3 Uses High Effi ciency 3mm Tall Transformers
3585 F15
Figure 15. Auto Refresh Application
3585 F16
3585 F17
Figure 16. Auto Refresh Basic Operation Figure 17. VOUT AC Ripple in Auto Refresh Mode
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. UPACKAGE DESCRIPTIO 10-Lead Plastic DFN (3mm × 2mm) (Reference LTC DWG # 05-08-1722 Rev Ø) 2.00 ±0.10 (2 SIDES) NOTE: 1. DRAWING CONFORMS TO VERSION (WECD-1) IN JEDEC PACKAGE OUTLINE M0-229 2. DRAWING NOT TO SCALE 3. ALL DIMENSIONS ARE IN MILLIMETERS 4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE 5. EXPOSED PAD SHALL BE SOLDER PLATED 6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE TOP AND BOTTOM OF PACKAGE 0.40 ± 0.10 BOTTOM VIEW—EXPOSED PAD 0.64 ± 0.05 (2 SIDES) 0.75 ±0.05 R = 0.115 TYPR = 0.05 TYP 2.39 ±0.05 (2 SIDES) 3.00 ±0.10 (2 SIDES) 106 PIN 1 BAR TOP MARK (SEE NOTE 6)
0.200 REF
0 – 0.05 (DDB10) DFN 0905 REV Ø 0.25 ± 0.05
0.50 BSC
R = 0.20 OR 0.25 × 45° CHAMFER 0.25 ± 0.05 2.39 ±0.05 (2 SIDES) RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS 0.64 ±0.05 (2 SIDES) 1.15 ±0.05 0.70 ±0.05 2.55 ±0.05 PACKAGE OUTLINE
Charges 100µF Capacitor to 320V in 2.5 Seconds from 3.6V. ThinSOT is a trademark of Linear Technology Corporation. Figure 18. LT3585-3 Typical Application