ZHCSM35F January 2007 – May 2021 LM5002
PRODUCTION DATA
| PIN | TYPE(1) | DESCRIPTION | ||
|---|---|---|---|---|
| NAME | SOIC | WSON | ||
| COMP | 7 | 1 | O | Open-drain output of the internal error amplifier: the loop compensation network must be connected between the COMP pin and the FB pin. COMP pullup is provided by an internal 5-kΩ resistor which can be used to bias an opto-coupler transistor (while FB is grounded) for isolated ground applications. |
| EN | 8 | 2 | I | Enable and undervoltage lockout or shutdown input: an external voltage divider can be used to set the line undervoltage lockout threshold. If the EN pin is left unconnected, a 6-μA pullup current source pulls the EN pin high to enable the regulator. |
| EP | — | EP | — | Exposed pad (WSON only): exposed metal pad on the underside of the package with a resistive connection to pin 6. It is recommended to connect this pad to the PCB ground plane to improve heat dissipation. |
| FB | 6 | 8 | I | Feedback input from the regulated output voltage: this pin is connected to the inverting input of the internal error amplifier. The 1.26-V reference is internally connected to the non-inverting input of the error amplifier. |
| GND | 4 | 6 | G | Ground: internal reference for the regulator control functions and the power MOSFET current sense resistor connection. |
| RT | 5 | 7 | I | Oscillator frequency programming and optional synchronization pulse input: the internal oscillator is set with a resistor, between this pin and the GND pin. The recommended frequency range is 50 KHz to 1.5 MHz. The RT pin can accept synchronization pulses from an external clock. A 100-pF capacitor is recommended for coupling the synchronizing clock to the RT pin. |
| SW | 1 | 3 | I | Switch pin: the drain terminal of the internal power MOSFET |
| VIN | 2 | 4 | P | Input supply pin: nominal operating range is 3.1 V to 75 V. |
| VCC | 3 | 5 | P | Bias
regulator output, or input for external bias supply: VCC tracks VIN
up to 6.9 V. Above VIN = 6.9 V, VCC is regulated to 6.9 V. A 0.47-μF or greater ceramic decoupling capacitor is required. An external voltage (7 V to 12 V) can be applied to this pin which disables the internal VCC regulator to reduce internal power dissipation and improve converter efficiency. |