JAJSGD0I April 2004 – October 2018 LM5008
PRODUCTION DATA.
PIN | TYPE | DESCRIPTION | |
---|---|---|---|
NO. | NAME | ||
1 | SW | P | Switching node: power switching node. Connect to the output inductor, re-circulating diode, and bootstrap capacitor. |
2 | BST | I | Boost pin (bootstrap capacitor input): an external capacitor is required between the BST and the SW pins. A 0.01-µF ceramic capacitor is recommended. An internal diode charges the capacitor from VCC. |
3 | RCL | I | Current limit OFF time set pin: a resistor between this pin and RTN sets the off-time when current limit is detected. The off-time is preset to 35 µs if FB = 0 V.
Toff = 10–5 / (0.285 + (FB / 6.35 × 10−6 × RCL)) |
4 | RTN | G | Ground pin: ground for the entire circuit. |
5 | FB | I | Feedback input from regulated output: this pin is connected to the inverting input of the internal regulation comparator. The regulation threshold is 2.5 V. |
6 | RON/SD | I | On-time set pin: a resistor between this pin and VIN sets the switch on-time as a function of VIN. The minimum recommended on-time is 400 ns at the maximum input voltage. This pin can be used for remote shutdown.
Ton = 1.25 × 10–10 RON / VIN |
7 | VCC | P | Output from the internal high voltage series pass regulator. Regulated at 7 V. If an auxiliary voltage is available to raise the voltage on this pin, above the regulation set point (7 V), the internal series pass regulator will shutdown, reducing the IC power dissipation. Do not exceed 14 V. This voltage provides gate drive power for the internal buck switch. An internal diode is provided between this pin and the BST pin. A local 0.1-µF decoupling capacitor is recommended. Series pass regulator is current limited to 10 mA. |
8 | VIN | P | Input voltage: recommended operating range is 9.5 V to 95 V. |
— | EP | G | Exposed pad: the exposed pad has no electrical contact. Connect to system ground plane for reduced thermal resistance (WSON package only). |