Electronic Components Datasheet Search |
|
CAT4237TD-T3 Datasheet(PDF) 3 Page - ON Semiconductor |
|
CAT4237TD-T3 Datasheet(HTML) 3 Page - ON Semiconductor |
3 / 13 page CAT4237 http://onsemi.com 3 Table 3. DC ELECTRICAL CHARACTERISTICS (VIN = 3.6 V, ambient temperature of 25°C (over recommended operating conditions unless otherwise specified)) Symbol Parameter Conditions Min Typ Max Unit IQ Operating Current VFB = 0.2 V VFB = 0.4 V (not switching) 0.6 0.1 1.5 0.6 mA ISD Shutdown Current VSHDN = 0 V 0.1 1 mA VFB FB Pin Voltage 8 LEDs with ILED = 20 mA 285 300 315 mV IFB FB pin input leakage 1 mA ILED Programmed LED Current R1 = 10 W R1 = 15 W R1 = 20 W 28.5 19 14.25 30 20 15 31.5 21 15.75 mA VIH VIL SHDN Logic High SHDN Logic Low Enable Threshold Level Shutdown Threshold Level 0.4 0.8 0.7 1.5 V FSW Switching Frequency 0.8 1.0 1.3 MHz ILIM Switch Current Limit 350 450 600 mA RSW Switch “On” Resistance ISW = 100 mA 1.0 2.0 W ILEAK Switch Leakage Current Switch Off, VSW = 5 V 1 5 mA Thermal Shutdown 150 °C Thermal Hysteresis 20 °C VUVLO Undervoltage Lockout (UVLO) Threshold 1.9 V VOV-SW Overvoltage Threshold 35 V Pin Description VIN is the supply input for the internal logic. The device is compatible with supply voltages down to 2.8 V and up to 5.5 V. It is recommended that a small bypass ceramic capacitor (4.7 mF) be placed between the VIN and GND pins near the device. If the supply voltage drops below 1.9 V, the device stops switching. SHDN is the shutdown logic input. When the pin is tied to a voltage lower than 0.4 V, the device is in shutdown mode, drawing nearly zero current. When the pin is connected to a voltage higher than 1.5 V, the device is enabled. GND is the ground reference pin. This pin should be connected directly to the ground place on the PCB. SW pin is connected to the drain of the internal CMOS power switch of the boost converter. The inductor and the Schottky diode anode should be connected to the SW pin. Traces going to the SW pin should be as short as possible with minimum loop area. An over-voltage detection circuit is connected to the SW pin. When the voltage reaches 35 V, the device enters a low power operating mode preventing the SW voltage from exceeding the maximum rating. FB feedback pin is regulated at 0.3 V. A resistor connected between the FB pin and ground sets the LED current according to the formula: ILED + 0.3 V R1 The lower LED cathode is connected to the FB pin. Table 4. PIN DESCRIPTIONS Pin # Name Function 1 SW Switch pin. This is the drain of the internal power switch. 2 GND Ground pin. Connect the pin to the ground plane. 3 FB Feedback pin. Connect to the last LED cathode. 4 SHDN Shutdown pin (Logic Low). Set high to enable the driver. 5 VIN Power Supply input. |
Similar Part No. - CAT4237TD-T3 |
|
Similar Description - CAT4237TD-T3 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.NET |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |