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AP5100 Datasheet(PDF) 4 Page - Diodes Incorporated |
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AP5100 Datasheet(HTML) 4 Page - Diodes Incorporated |
4 / 12 page AP5100 1.2A Step-Down Converter with 1.4MHz Switching Frequency AP5100 4 of 12 MARCH 2010 Document number: DS32130 Rev. 1 - 2 www.diodes.com © Diodes Incorporated Pin Descriptions Pin Name Pin # Description BST 1 Bootstrap. To form a boost circuit, a capacitor is connected between SW and BST pins to form a floating supply across the power switch driver. This capacitor is needed to drive the power switch’s gate above the supply voltage. Typical values for CBST range from 0.1uF to 1uF. GND 2 Ground. This pin is the voltage reference for the regulated output voltage. All control circuits are referenced to this pin. For this reason care must be taken in its layout. FB 3 Feedback. To set the output voltage, connect this pin to the output resistor divider or directly to VOUT. To prevent current limit run away during a current limit condition, the frequency foldback comparator lowers the oscillator frequency when the FB voltage is below 400mV. EN 4 On/Off Control Input. Do not leave this pin floating. To turn the device ON, pull EN above 1.2V and to turn it off pull below 0.4V. If enable/disable is not used, connect a 100kOhm resistor between EN to VIN. IN 5 Supply Voltage. The AP5100 operates from a +4.75V to +24V unregulated input. A decoupling capacitor C1 is required to prevent large voltage spikes from appearing at the input. Place this capacitor near the IC. SW 6 Switch Output. This is the reference for the floating top gate driver. Absolute Maximum Ratings (Note 3) Symbol Description Rating Unit ESD HBM Human Body Model ESD Protection 3 KV ESD MM Machine Model ESD Protection 300 V VIN Supply Voltage 26 V VSW Switch Voltage -0.3 to VIN + 0.3 V VBST Boost Voltage VSW + 6 V All Other Pins –0.3 to +6 V TST Storage Temperature -65 to +150 °C TJ Junction Temperature +150 °C TL Lead Temperature +260 °C θ JA Junction to Ambient Thermal Resistance (Note 4) 140 °C/W θ JC Junction to Case Thermal Resistance (Note 4) 35 °C/W Notes: 3. Exceeding these ratings may damage the device. 4. Test condition for SOT26: Measured on approximately 1” square of 1 oz copper. |
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