CAT4237TD-GT3 ON Semiconductor, CAT4237TD-GT3 Datasheet
CAT4237TD-GT3
Specifications of CAT4237TD-GT3
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CAT4237TD-GT3 Summary of contents
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... TSOT−23 TD SUFFIX CASE 419AE PIN CONNECTIONS 1 SW GND FB (Top View) MARKING DIAGRAMS LTYM LT = CAT4237TD− CAT4237TD−GT3 Y = Production Year (Last Digit Production Month (1− ORDERING INFORMATION Device Package CAT4237TD−T3 TSOT−23 (Note 1) (Pb−Free) CAT4237TD−GT3 TSOT−23 (Note 2) (Pb− ...
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4 4.7 mF OFF Table 1. ABSOLUTE MAXIMUM RATINGS Parameters voltage IN SHDN voltage SW voltage Storage Temperature Range Junction Temperature Range Lead Temperature Stresses exceeding Maximum Ratings may damage ...
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Table 3. DC ELECTRICAL CHARACTERISTICS (V = 3.6 V, ambient temperature of 25°C (over recommended operating conditions unless otherwise specified)) IN Symbol Parameter I Operating Current Q I Shutdown Current Pin Voltage pin input ...
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Block Diagram 4.7 mF 300 mV – V REF Enable Thermal Shutdown SHDN & UVLO Device Operation The CAT4237 is a fixed frequency (1 MHz), low noise, inductive boost converter that provides a constant ...
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4.7 mF 0.22 mF with 8 LEDs OUT 140 120 100 80 60 VFB = 0 (not switching ...
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4.7 mF 0.22 mF with 8 LEDs OUT ...
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4.7 mF OUT EN 5V/div VOUT 10V/div Input Current 100mA/ div 50 msec/div Figure 16. Power−up with 8 LEDs 303 302 301 300 299 V = 3.6 V, ...
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Application Information External Component Selection Capacitors The CAT4237 only requires small ceramic capacitors of 4 the input and 0. the output. Under normal condition, a 4.7 mF input capacitor is sufficient. For applications with higher output ...
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Open LED Protection In the event of an “Open LED” fault condition, the CAT4237 will continue to boost the output voltage with maximum power until the output voltage reaches approximately 35 V. Once the output exceeds this level, the internal ...
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Dimming Control There are several methods available to control the LED brightness. PWM Signal on the SHDN Pin LED brightness dimming can be done by applying a PWM signal to the SHDN input. The LED current is repetitively turned on ...
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Board Layout The CAT4237 is a high−frequency switching regulator. The traces that carry the high−frequency switching current have to be carefully layout on the board in order to minimize EMI, ripple and noise in general. The thicker lines on Figure ...
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TOP VIEW SIDE VIEW Notes: (1) All dimensions are in millimeters. Angles in degrees. (2) Complies with JEDEC MO-193. PACKAGE DIMENSIONS TSOT−23, 5 LEAD CASE 419AE−01 ISSUE O SYMBOL MIN A A1 0.01 A2 ...
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... All packages are RoHS−compliant (Lead−free, Halogen−free). 5. The standard lead finish is NiPdAu. 6. The device used in the above example is a CAT4237TD−GT3 (TSOT−23, NiPdAu Plated Finish, Tape & Reel, 3,000/Reel). 7. For Matte−Tin package option, please contact your nearest ON Semiconductor Sales office. ...