AGND |
1 |
- |
Analog Ground. Ground connection of internal control circuits. |
PGND |
2 |
- |
Power Ground. Ground connection of the internal synchronous rectifier FET. |
VIN |
3 |
I |
Input supply connection. Operating input range is 4.5-V to 100-V. |
EN/UVLO |
4 |
I |
Precision enable. Input pin of undervoltage lockout (UVLO) comparator. |
RON |
5 |
I |
On-time programming pin. A resistor between this pin and VIN sets the switch ON-time as a function of input voltage. |
SS |
6 |
I |
Softstart. Connect a capacitor from SS to AGND to control output rise time and limit overshoot. |
FPWM |
8 |
I |
Forced PWM logic input pin. Connect to AGND for discontinuous conduction mode (DCM) with light loads. Connect to VCC for continuous conduction mode (CCM) at all loads and Fly-Buck configuration. |
FB |
9 |
I |
Feedback input of voltage regulation comparator. |
VCC |
10 |
O |
Internal high voltage start-up regulator bypass capacitor pin. |
BST |
11 |
I |
Bootstrap capacitor pin. Connect a capacitor between BST and SW to bias gate driver of high-side buck FET. |
SW |
12,13 |
O |
Switch node. Source connection of high side buck FET and drain connection of low-side synchronous rectifier FET. |
NC |
7,14 |
|
No Connection. |
EP |
- |
|
Exposed Pad. Connect to AGND and printed-circuit board ground plane to improve power dissipation. |