cat3604a ON Semiconductor, cat3604a Datasheet
cat3604a
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cat3604a Summary of contents
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... Regulated Charge Pump White LED Driver Description The CAT3604A is a charge pump operating in either 1x (LDO) mode or 1.5x fractional mode regulating current through each of the 4 LED pins. Operation at a fixed high frequency of 1 MHz typical allows the use of very small value ceramic capacitors. ...
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... LED 2 cathode terminal 16 LED1 LED 1 cathode terminal Pad GND Pad Ground reference 1 μF 1 μF C1+ C1− C2+ C2− VIN VOUT EN EN CAT3604A Control 0 CTR0 LED1 Control 1 CTR1 LED2 Control 2 CTR2 LED3 RSET LED4 GND R SET 24 kW Figure 1. Typical Application Circuit Function http://onsemi ...
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Table 2. ABSOLUTE MAXIMUM RATINGS Parameter VIN, VOUT, LEDx voltage EN, CTRx voltage RSET voltage RSET current Ambient Temperature Range Storage Temperature Range Lead Temperature ESD Rating HBM (Human Body Model) ESD Rating MM (Machine Model) (Note 3) Stresses exceeding ...
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... 4 1.2 V Ref RSET Current Setting R SET 24 kW CTR0 LED Output CTR1 Select CTR2 Figure 2. CAT3604A Functional Block Diagram 1 μF 1 μF C1− C1+ C2− C2+ 1x mode (LDO) 1.5x Charge Pump Mode Control 1 MHz Oscillator GND http://onsemi.com 4 V OUT C OUT 1 μ ...
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... Basic Operation At power-up, the CAT3604A starts operation in 1x mode able to drive the programmed LED current, it continues in 1x mode. If the battery voltage drops to a level where the LED current cannot be met, the driver automatically switches into 1.5x mode. The 1.5x charge pump will boost the output voltage accordingly to achieve the nominal LED current ...
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100 1x Mode per LED per LED 4.2 4.0 3.8 3.6 3.4 DISCHARGING BATTERY (V) Figure 3. Efficiency ...
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VIN = 3 all LEDs open 0 3.0 3.2 3.4 3.6 INPUT VOLTAGE (V) Figure 9. Ground Current vs. Input Voltage (1.5x ...
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VIN AC coupled 50mV/ div Input Current AC coupled 10mA/ div AC coupled VOUT 50mV/ div 500 nsec/div Figure 15. Switching Waveforms in 1.5x Mode EN 2V/div Input Current ...
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Recommended Layout When the driver is in the 1.5x charge pump mode, the 1 MHz switching frequency operation requires to minimize trace length and impedance ...
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D PIN#1 INDEX AREA TOP VIEW SYMBOL MIN NOM A 0.70 0.75 A1 0.00 0.02 A3 0.20 REF b 0.25 0.30 D 3.90 4.00 D2 2.00 −−− E 3.90 4.00 E2 2.00 −−− e 0.65 BSC L 0.45 −−− Notes: ...
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... Product Number (Optional) 3604A 5. The device used in the above example is a CAT3604AHV4−T2 (TQFN, Tape & Reel, 2,000/Reel). 6. All packages are RoHS−compliant (Lead−free, Halogen−free). 7. The standard lead finish is Matte−Tin. 8. For additional package and temperature options, please contact your nearest ON Semiconductor Sales office. ...