ZHCSNC8A February 2021 – March 2021 TPS541620
PRODUCTION DATA
Figure 5-1 25-Pin VQFN-HRRPB Package(Top View)| PIN | I/O/B/P(2) | DESCRIPTION | |
|---|---|---|---|
| NAME | NO. | ||
| BOOT2 | 1 | I | Bootstrap pin for the internal flying high-side driver. Connect a typical 100-nF capacitor from this pin to SW2. |
| SW2 | 2 | B | Channel 2 power stage switch node. Connect this pin to the channel 2 output inductor. |
| PGND | 3, 7, 23, 25 | G | Power stage ground return |
| SW1 | 4 | B | Channel 1 power stage switch node. Connect this pin to the channel 1 output inductor. |
| BOOT1 | 5 | I | Bootstrap pin for the internal flying high-side driver. Connect a typical 100-nF capacitor from this pin to SW1. |
| PVIN1 | 6 | I | Power conversion input. Bypass with capacitor from PVIN1 (pin 6) to PGND (pin 7). |
| SYNC | 8 | I | Synchronizes to external clock. Tie to BP5 for internal switching frequency. Connect it to an external clock for frequency synchronization. |
| MODE1 | 9 | I | Pin strap set pin. Connect a resistor from this pin to GND to set supply configurations, dual independent outputs, primary/secondary, and clock delays. |
| MODE2 | 10 | I | Pin strap set pin. Select from four preselected switching frequencies, each with four settings of compensation. |
| NC1 | 11 | — | No internal connection |
| SS | 12 | O | External soft start for multi-phase configuration only. Place a capacitor from SS to AGND to set output rise time. Float for dual-output configurations. Dual-output mode uses an internal soft start of 1 ms. |
| FB1 | 13 | I | Feedback input. Connect to the output voltage of channel 1 with a resistor divider for dual-output mode. For multi-phase configuration, FB1 is used for positive input of the remote sense amplifier. |
| GOSNS | 14 | I | Connect to ground of the output capacitor as remote sense ground in multi-phase operation. In dual-output mode, simply ground this pin to PGND. |
| AGND | 15 | G | Analog ground. Connect to PGND at one single point away from noisy circuitry. |
| BP5 | 16 | I/O | LDO output. Connect a 2.2-μF to 4.7-μF capacitor to PGND. BP5 must not be connected to an external load. |
| FB2/VSHARE | 17 | I/O | Feedback input. Connect to the output voltage of channel 2 with a resistor divider for dual-output mode. |
| EN2/ISHARE(1) | 18 | I/O | Enable high to power on. This pin can also be used to externally adjust EN UVLO by connecting a resistor divider between PVIN and AGND. |
| NC2 | 19 | — | No internal connection |
| EN1 | 20 | I | Enable high to power on. This pin can also be used to externally adjust EN UVLO by connecting a resistor divider between PVIN and AGND. |
| PGOOD2/CLKO | 21 | O | Open-drain power-good indicator for channel 2 output |
| PGOOD1 | 22 | O | Open-drain power-good indicator for channel 1 output |
| PVIN2 | 24 | I | Power conversion input. Bypass with a capacitor from PVIN2 (pin 24) to PGND (pin 23). |